JP2001061289A - Device for forming speed control signal of motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control the speed of a brushless DC motor, using a simple circuit. SOLUTION: This device uses the output of Hall elements 3, 4, and 5 for detecting the relative positions of three-phase stator coil winding 9, 9v, and 9w of a brushless DC motor and a rotor 10 and detects the rotational speed of the rotor 10. Also, the device differentiates first, second, and third position detection signals obtained from the Hall elements 3, 4, and 5, and obtains first, second, and third differential output voltages. Then, a positive or nearly positive half-waves of the first, second, and third differential output voltages are extracted with a switch, and the output of the Hall element with a small phase difference with respect to the differential output voltage is used for creating a two-value switch control signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for forming a speed control signal of a motor used for transferring an optical pickup of an optical disk device such as a CD-ROM device.

[0002]

2. Description of the Related Art When a brushless DC motor is used as a disk rotation motor of a data recording or reproducing disk device or a feed motor of an optical pickup, for example, as disclosed in Japanese Patent Laid-Open No. 4-362566, Control of the rotation speed of the motor is required. For this reason, the conventional brushless DC motor has a speed detector. Japanese Patent Laid-Open Publication No. Hei 3-16066 discloses that a Hall element is disposed on a stator of a brushless DC motor, and an output of the Hall element is rectified to obtain a speed signal.

[0003]

By the way, if the speed detector is provided independently, the cost of the motor control circuit is inevitably increased. In addition, the method disclosed in Japanese Patent Application Laid-Open No. H3-160666 requires a complicated circuit configuration and a large ripple in the speed signal.

It is an object of the present invention to provide a motor speed control signal forming device capable of forming a speed detection signal or a speed control signal by a simple circuit. Another object of the present invention is to provide an apparatus for forming a speed control signal of a motor capable of reducing a ripple.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems and to achieve the above-mentioned object, the present invention provides first, second and third stator windings, a rotor comprising permanent magnets, First,
A plurality of magnetoelectric conversion elements arranged so as to have a fixed positional relationship with respect to the second and third stator windings, the plurality of magnetoelectric conversion elements exhibiting a change in a magnetic field according to rotation of the permanent magnet; The first, second, and third position detection signals indicating the relative positional relationship between the first, second, and third phase stator windings and the permanent magnets based on the output of A position detecting means which is sequentially generated by the
And switching the exciting currents of the first, second and third stator windings based on the third position detection signal, and rotating the rotor to a target speed. And an excitation control means for controlling an excitation current of a third stator winding, the apparatus for generating a speed control signal of a brushless DC motor, wherein the first, second and third position detections are performed. Differentiating the signals respectively, the first, second and third
First, second, and third differentiating circuits forming first, second, and third differential signals having a 90-degree leading phase with respect to the position detection signal, and the first, second, and third differential circuits. Are synchronized with the first, second, and third position detection signals based on the first and second position detection signals, respectively.
A first, second, and third binary signal forming circuit for forming first, second, and third binary signals having the following voltage levels:
A first switch for allowing the first differential signal obtained from the first differential circuit to pass only during a period of the first voltage level of the third binary signal, and a second differential circuit A second switch for passing the second differential signal obtained from the first binary signal only during the period of the first voltage level of the first binary signal, and the third switch obtained from the third differential circuit.
A third switch for passing the differential signal of the second binary signal only during the period of the first voltage level of the second binary signal;
Adding means for adding the outputs of the second and third switches to output a rotation speed detection signal of the rotor; target rotation speed signal generation means for generating a signal indicating a target rotation speed of the rotor; A motor speed control signal forming device comprising: a value corresponding to a difference between a signal indicating a target rotation speed and the rotation speed detection signal; and a calculation means for supplying the value as a speed control signal to the excitation control means. It is concerned.

It is possible to provide a magnet which rotates together with the rotor and detect the magnetic flux of this magnet with a magneto-electric conversion element to detect the rotation speed. In this case, the motor may be a DC motor having a brush or an AC motor. Also,
Claims 2, 4, 6, 8, 10, 12, 14, 16, 1
As shown in 8, 20, 22, and 24, the first and second signals whose phases are delayed by 30 degrees from the first, second, and third position detection signals.
And forming a third binary signal. Also,
It is desirable to use one operational amplifier for both differentiation and addition, as shown in claims 3, 4, 5, 6, 15, 16, 17, 18. It is desirable to provide fourth, fifth and sixth switches to selectively discharge the first, second and third capacitors for differentiation. Claim 5
6, 9, 10, 11, 12, 17, 18, 21, 22,
As shown at 23 and 24, one operational amplifier can be used for differentiation and addition as well as for subtraction to form a speed control signal. Claims 7, 8, 9, 10, 1
As shown in 9, 20, 21, and 22, fourth to sixth switches are provided, and are operated in the opposite manner to the first to third switches,
A speed detection signal equivalent to full wave rectification of the differential signal can be obtained. It is preferable that the binary signal forming circuit is constituted by first, second and third delay position signal forming circuits and first, second and third waveform shaping circuits. As set forth in claim 26, the first, the second and the third.
Can be formed based on the addition of two position detection signals selected from the first, second, and third position detection signals, that is, vector synthesis. Claim 27
As shown in (1), the position detecting means can be constituted by first, second and third magneto-electric conversion elements. Claim 28
As shown in (1), the first and second magneto-electric conversion elements for obtaining the first and second position detection signals, and the third position based on the first and second position detection signals. And a circuit for forming a detection signal.

[0007]

According to the present invention, a speed detection signal or a speed control signal with little ripple can be easily obtained. In the inventions of claims 1 to 12, an independent speed detector is not provided, and a speed detection signal or a speed control signal is formed based on an output of a position detecting magnetoelectric conversion element (for example, a Hall element). Have been. Therefore, cost reduction or downsizing of the speed detection circuit or the speed control signal forming circuit is achieved. When the speed detection signal or the speed control signal is formed, the first, second, and third position detection signals are differentiated, and the differentiated signal is selectively extracted or conversion equivalent to rectification is performed. Is required. In the present invention, the extraction or rectification controls the first to third switches by the first, second and third position detection signals or the first, second and third binary signals based on the 30 degree delay signal. And go. Therefore, control of the first to third switches, which is necessary when obtaining one DC speed detection signal or speed control signal, can be easily achieved. Claims 2, 4, 6,
8, 10, 12, 14, 16, 18, 20, 22, 24
According to the invention, the differential signal can be ideally extracted by using the 30-degree delay position detection signal, and the ripple of the speed detection signal or the speed control signal can be reduced favorably. Further, according to the third to tenth and fifteenth to twenty-second aspects of the present invention, the simplification of the circuit configuration is achieved because one operational amplifier is used for differentiation and addition of the differential signal. According to the invention of claims 5, 6, 7, 8, 17, 18, 19, and 20, one operational amplifier is differentiated, the differential signal is added, and the speed detection signal and the target speed signal are subtracted. , The circuit configuration is further simplified. Claims 7-1
According to the inventions of 0, 19, and 22, the first, second, and third differential signals are full-wave by combining the first, second, and third switches with the fourth, fifth, and sixth switches. It is possible to obtain a speed detection signal or a speed control signal equivalent to rectification, and these ripples are further reduced. According to the twenty-fifth and twenty-sixth aspects, a 30-degree delay position detection signal and a binary signal based thereon can be easily formed. According to the twenty-seventh aspect, the first, second, and third position detection signals can be easily obtained based on the first, second, and third magnetoelectric conversion elements. According to the twenty-eighth aspect, the first, second, and third position detection signals can be obtained by the two magnetoelectric conversion elements, so that the cost can be reduced.

[0008]

Embodiments and Examples Next, embodiments and examples of the present invention will be described with reference to FIGS.

[0009]

First Embodiment First, a brushless DC motor device according to a first embodiment shown in FIGS. 1 to 5 will be described. As shown schematically in FIG. 1, this brushless DC motor device includes a brushless DC motor main body 1, a control and drive circuit 2 as excitation control means, and first, second and third magnetoelectric conversion elements. Hall elements 3, 4, 5, a speed detection circuit 6,
It comprises a target speed signal generator 7 and a speed control signal forming error amplifier 8. The speed detecting circuit 6, the target speed signal generator 7, and the error amplifier 8 constitute a speed control signal forming circuit according to the present invention.

The brushless DC motor main body 1 comprises a stator 9 and a rotor 10 as shown in principle in FIG.
It is configured as an outer rotor type. The stator 9 includes first, second and third stator windings 9u, 9v, 9w and a core 11 made of a magnetic material. The core 11 is divided by twelve slots 11a arranged at equal angular intervals and has twelve teeth 11b. Stator winding 9u, 9
v and 9w are divided into nine teeth 11b and wound.
Since the u, v, w phase stator windings 9u, 9v, 9w are repeatedly arranged so as to be adjacent to each other, the electrical angle between the two slots 11a and between the two teeth 11b is 120. Degrees, or 2π / 3. In the example of FIG.
The stator windings 9u, 9v, 9w are not wound around the three teeth 11b. First, second and third Hall elements 3,
Reference numerals 4 and 5 are sequentially arranged at the center of three slots 11a adjacent to the teeth 11b on which the stator windings 9u, 9v and 9w are not wound, with a mutual interval of 120 electrical degrees. Thereby, the influence of the magnetic field based on the stator windings 9u, 9v, 9w on the Hall elements 3, 4, 5 is reduced. In addition, the first and second having a phase difference of 120 degrees sequentially.
And the third position detection signal can be obtained from the first, second, and third Hall elements 3, 4, and 5. The stator windings 9u, 9v, 9w for the Hall elements 3, 4, 5
When the effect of the magnetic field is not so important, the stator windings 9u, 9v, 9w can be wound around all twelve teeth 11b.

The rotor 10 is formed of a cylindrical permanent magnet having eight north poles and eight south poles alternately, and is arranged so as to surround the stator 9. The Hall elements 3, 4, and 5 are arranged so as to have a fixed positional relationship with the stator windings 9u, 9v, and 9w, and are arranged at positions where a change in magnetic flux based on the rotor 10 can be detected. , Rotor 10
Rotate, the first, second and third Hall elements 3,
4, 5 to 3 phase AC voltages shown in FIG.
And third position detection signals Vh1, Vh2, and Vh3.
The first, second, and third position detection signals Vh1, Vh2, and Vh3 are sinusoidal three-phase AC voltages having a phase difference of 120 degrees from each other.

In FIG. 1, a motor control and drive circuit 2 as motor excitation control means includes stator windings 9u, 9
v, 9w to control and supply the exciting current,
Lines 12, 13, and 14 connect the first, second, and third Hall elements 3, 4, and 5, and a line 15 connects to the speed control signal forming error amplifier 8.

FIG. 3 shows the motor control and drive circuit 2 in detail. The motor control and drive circuit 2 includes a DC power supply 16, a speed control circuit 17, and first, second, third, fourth, fifth, and sixth excitation changeover switches 18, 19, 20, 21 each including a transistor. , 22, 23 and the first,
It has second and third amplifiers 24, 25, 26 and a switch switching signal forming circuit 27. One end of each of the first, second and third stator windings 9u, 9v and 9w is connected to the DC power supply 16 through the first, third and fifth switches 18, 20 and 22 and the speed control circuit 17. It is connected to one end and to the other end of the DC power supply 16 via the second, fourth and sixth switches 19, 21 and 23. The other ends of the first, second, and third stator windings 9u, 9v, 9w are commonly connected to each other. The switch switching signal forming circuit 27 includes first, second and third position detection signals Vh1, Vh2,... Of the lines 12, 13, 14 obtained from the first, second, and third Hall elements 3, 4, 5. In response to Vh3, a switch control signal for sequentially turning on the first to sixth excitation changeover switches 18 to 23 in a two-phase excitation mode is created by a well-known method.
To the control terminals of the sixth switches 18 to 23, that is, the bases. For example, when exciting currents are simultaneously applied to the stator windings 9u and 9v, the first switch 18 and the fourth switch
Switch 21 is turned on at the same time. When exciting currents are simultaneously supplied to the second and third stator windings 9v and 9w, the third switch 20 and the sixth switch 23 are simultaneously turned on. Also, the first and third stator windings 9
When exciting currents are simultaneously supplied to u and 9w, the fifth switch 22 and the second switch 19 are simultaneously turned on. The speed control circuit 17 is connected between the DC power supply 16 and the first to third stator windings 9u, 9v, 9w, and supplies the first to third stator windings 9u, 9v, 9w. The power is controlled in response to a speed control signal on line 15. That is, when increasing the rotation speed of the rotor 10, the stator windings 9u, 9
In order to increase the power supply to the motors v and 9w and reduce the rotation speed, the power supply to the stator windings 9u, 9v and 9w should be reduced, or the switching timing of the switch switching signal forming circuit 27 should be changed to the current rotation. Apply the brake in the opposite direction.

Although the speed control circuit 17 is provided independently in FIG. 3, this independent speed control circuit 17 is omitted and FIG.
As shown by the chain line 15a, the speed control signal line 15 is connected to the switch switching signal forming circuit 27, and the first to sixth switches 18 to 23 are included in the switch switching signal forming circuit 27.
Means for controlling the amount of power supply via the power supply can be provided. In other words, the first to sixth switches 18 to 23 are PWMs having a period sufficiently shorter than the ON / OFF period for the excitation switching.
(Pulse width modulation) signal, thereby controlling the magnitude of the exciting current by turning on / off the first to sixth switches 18 to 23 at a high frequency during these ON periods (excitation driving periods). Can be. Or, the first to sixth switches 1
It is also possible to control the speed of the motor by controlling the resistance value in the on period of 8 to 23.

The speed detection circuit 6 of FIG. 1 is a new circuit according to the present invention, has no independent speed detector, and detects first, second and third position detection signals inputted from lines 31, 32 and 33. Based on the signals Vh1, Vh2, Vh3, the speed detection signal V
t is created and output on line 34.

FIG. 4 shows the speed detection circuit 6 of FIG. 1 in detail, and shows the first, second and third input stage amplifiers 3.
5, 36, 37 and first, second and third differentiating circuits 3
8, 39, 40, first, second, and third speed detection switches 41, 42, 43, a binary signal forming circuit 44,
And an adder 45.

The first, second and third differentiating circuits 38, 3
9 and 40 are connected to first, second and third position detection signal lines 31, 32 and 33 via amplifiers 35, 36 and 37, respectively, and the first, second and third positions shown in FIG. The position detection signals Vh1, Vh2, and Vh3 are differentiated, respectively, and the first, second, and third differential signals, that is, the differential output voltages shown in Vd1, Vd2, and Vd3 in FIG. appear. First, second and third differential output voltages Vd1, Vd2,
Vd3 includes speed information. If the first, second, and third differential output voltages Vd1, Vd2, and Vd3 are simply added, they cancel each other out, and one DC speed detection voltage cannot be obtained. Therefore, the first, second and third differential output voltages V
It is conceivable that d1, Vd2, and Vd3 are full-wave rectified by diodes and added. However, a diode full-wave rectifier circuit
It is not suitable for rectifying a minute level differential output voltage when the rotation speed of the rotor 10 is low. In order to solve this problem, instead of the diode rectifier circuit, a switch or an amplifier is selectively operated so that the output voltages V of the differentiating circuits 38, 39 and 40 are reduced.
It is considered that d1, Vd2, and Vd3 are full-wave rectified. However, when a switch or amplifier is used to configure a full-wave rectifier circuit, a switch or amplifier is required, and this circuit configuration is necessarily complicated. Therefore, in this embodiment, the first, second, and third speed detection switches 41, 4 are provided at the output stages of the first, second, and third differentiating circuits 38, 39, and 40, respectively.
2 and 43, and the switches 41, 42 and 43 connect the first, second and third differential output voltages Vd1, Vd2 and Vd.
A part of d3 is extracted. Further, a binary signal for on / off control of the first to third switches 41, 42, 43 is created based on the first to third position detection signals Vh1, Vh2, Vh3.

The binary signal forming circuit 44 for turning on / off the first, second and third speed detecting switches 41, 42 and 43 of the present embodiment comprises first, second and third speed detecting switches. This is a very simple circuit composed of the waveform shaping circuits 46a, 46b and 46c. First, second and third waveform shaping circuits 46
Reference numerals a, 46b, and 46c denote first, second, and third binary signal forming circuits, each including a comparator.
, The first, second and third position detection signals V
First, second, and third binary signals Vc1, Vc2, and V, which are signals obtained by shaping positive half-waves of h1, Vh2, and Vh3 into a square wave.
Outputs c3. The first, second and third binary signals V
As for c1, Vc2, and Vc3, one input terminal of each comparator is used as a reference potential (ground or a predetermined potential), and the other input terminal is provided with first, second, and third position detection signals Vh1, Vh2, Vc3.
A square wave voltage obtained by inputting h3 and having a first voltage level (high level) and a second voltage level (low level) alternately.

As apparent from the comparison between the first differential output voltage Vd1 and the third binary signal Vc3 in FIG. 5, the third binary signal Vc3 is slightly more than the first differential output voltage Vd1 by 30 times. It is only advanced. Therefore, the third binary signal Vc3 can be used for on / off control of the first speed detection switch 41. Therefore, in FIG. 4, the output line of the third waveform shaping circuit 46c is connected to the base (control terminal) of the first speed detection switch 41. As a result, the first speed detection signal Vs1 is obtained at the output stage of the first speed detection switch 41 in FIG. The first speed detection signal Vs1 is -30 degrees to 150 degrees of the first differential output voltage Vd1.
It corresponds to the component of the degree section. This first speed detection signal V
s1 includes a negative voltage in the -30 to 0 degree section,
It is smaller in both time width and amplitude than the positive voltage in the degree section.

FIG. 5 shows the relationship between the second differential output voltage Vd2 and the first binary signal Vc1, and the third differential output voltage Vd3 and the second differential signal Vd3.
Has the same phase relationship as the relationship between the first differential output voltage Vd1 and the third binary signal Vc3 described above. Therefore, the first waveform shaping circuit 46 of FIG.
The output line a is connected to the base of the second speed detection switch 42, and the output line of the second waveform shaping circuit 46b is connected to the base of the third speed detection switch 43. As a result, the second and third speed detection signals Vs2 and Vs3 shown in FIG. 5 are obtained at the output stages of the second and third speed detection switches 42 and 43.

The adder 45 in FIG. 4 includes first, second, and third
The first, second and third speed detection signals Vs1, Vs2, V obtained at the output stage of the speed detection switches 41, 42, 43
s3 is added to generate a DC speed detection signal Vt. The first, second, and third speed detection signals Vs1, Vs2, and Vs3 have a phase difference of 120 degrees from each other and each have only a negative component in a 30-degree section.
Is a signal having good smoothness, and the maximum ripple rate ΔV is 50%.

In FIG. 1, a target speed signal generator 7 is connected to one input terminal of a speed control signal forming error amplifier 8 by a line 7a, and a line 34 of a speed detection signal Vt is connected to the other input terminal. Have been. Since the target speed signal generator 7 generates a voltage indicating the target speed as the target speed signal, a signal indicating the difference between the voltage value of the target speed signal and the voltage value of the speed detection signal Vt is output from the error amplifier 8. Vcon and sent to the motor control and drive circuit 2 by line 15. Thus, the rotor 10 can be rotated at the target speed.

As is apparent from the above description, in this embodiment, a dedicated speed detector for detecting the rotation speed of the rotor 10 is not provided. The second and third position detection signals Vh1,
The speed detection signal Vt is created using Vh2 and Vh3. That is, the speed detection signal Vt is created using the outputs of the Hall elements 3, 4, and 5 for position detection. Therefore, speed detection can be performed with a simple configuration, and the size and cost of the speed control signal forming circuit of the brushless DC motor can be reduced. In the present embodiment, the first, second and third position detection signals Vh1, Vh2 and Vh3 are converted into binary signals Vc1, Vc2, Vc3, the first binary signal Vc1
Control the second speed detection switch 42, and control the third speed changeover switch 43 with the second binary signal Vc2.
The speed detection signal Vt having a relatively small ripple can be obtained by a simple circuit in which the first speed changeover switch 41 is controlled by the binary signal Vc3.

[0024]

Second Embodiment Next, a brushless DC motor device according to a second embodiment will be described with reference to FIG. However, in FIG. 6 and FIGS. 7 to 17 described later, portions common to FIGS. 1 to 5 are denoted by reference numerals in FIG. 1 and description thereof is omitted. Further, in the second to eighth embodiments, the parts substantially the same as those in the first embodiment are omitted from the drawings, and reference is made to FIGS.

In the brushless DC motor device of the second embodiment, the third Hall element 5 provided in the first embodiment is omitted, and the third position detection signal Vh3 is replaced by the first and second position detection signals Vh1. , Vh2, and is the same as the first embodiment.

As shown in FIG. 6, the third position detection signal forming circuit 49 includes first and second amplifiers 49a and 49b,
It comprises an adder 49c and a phase inversion circuit 49d. The two input terminals of the adder 49c are connected to the output lines of the first and second Hall elements 3, 4 via the amplifiers 49a, 49b, and have a phase difference of 120 degrees (2π / 3) from each other. The first and second phase detection signals Vh1 and Vh2 are added, that is, vector synthesized. The position inverting circuit 49d includes an adder 49.
The third position detection signal Vh3 is output by inverting the phase of the output of c. This third position detection signal Vh3 is substantially the same as the voltage waveform indicated by the same reference symbol in FIG.

According to the second embodiment, since three position detection signals Vh1, Vh2, and Vh3 are obtained by the two Hall elements 3, 4, the size and cost can be reduced by reducing the number of Hall elements. Become. In the second embodiment, the same components as those of the speed detection circuit 6 of the first embodiment are provided.
It also has the same effect as the embodiment.

[0028]

Third Embodiment In the third embodiment, the binary signal forming circuit 44 of FIG. 4 is modified into first, second and third binary signal forming circuits 44a, 44b and 44c of FIG. The other components are the same as those of the brushless DC motor of the first embodiment.

The first, second, and third binary signal forming circuits 44a, 44b, 44c of FIG. 7 include first, second, and third waveform shaping circuits 46a, 46b, 46c and first, second, and third waveform shaping circuits 46a, 46b, 46c, respectively. It comprises third 30-degree delay circuits 47a, 47b, 47c. First, second, and third 30-degree delay circuits 47a, 47
b, 47c are the first, second and third amplifiers 35, 3
6, 37 and the first, second and third waveform shaping circuits 46a,
46b, 46c, and the first and the second in FIG.
And first, second and third delay position signals Vh1, Vh obtained by delaying the third position detection signals Vh1, Vh2, Vh3 by 30 degrees.
2 ', Vh3 is output. The first, second and third waveform shaping circuits 46a, 46b and 46c output the first, second and third binary signals Vc1, Vc2 and Vc3 of FIG.

Note that the first, second and third binary signal forming circuits 44a, 44b and 44c are connected to the first, second and third 30-degree delay circuits 47a, 47b and 47c and the first and second And the third waveform shaping circuits 46a, 46b, 46c can be integrated. FIG. 8 shows an example of a first binary signal forming circuit 44a in which a 30-degree delay circuit 47a and a waveform shaping circuit 46a are integrated. The first binary signal forming circuit 44a is composed of first and second adding resistors R1 and R2 functioning as a part of a 30-degree delay circuit 47a, an operational amplifier or operational amplifier 48, and a reference voltage source Er. Become. An operational amplifier 48 having both addition and comparison functions
Is connected to the amplifiers 35 and 36 of FIG. 7 via first and second resistors R1 and R2. Therefore, the first and second position detection signals Vh1 and Vh2 are applied to the first and second resistors R1 and R2. Operational amplifier 48
Is connected to a reference voltage source Er. The reference voltage of the reference voltage source Er is set so as to coincide with the center potential (for example, 2.5 V) of the first to third position detection signals Vh1 to Vh3. The second resistor R2 has twice the resistance of the first resistor R1. As a result, as shown in FIG. 9, the first and second position detection signals Vh1 and Vh2 having a phase difference of 120 degrees from each other are added at a ratio of 2: 1 and are 30 degrees more than the first position detection signal Vh1. A delayed first delay position signal Vh1 'is obtained. The operational amplifier 48 has a function of the waveform shaping circuit 46a, and the first and second position detection signals V
When the first delay position signal Vh1 'based on h1 and Vh2 is higher than a reference voltage Er equal to the center value, the first delay position signal Vh1' outputs the first voltage level.
The second voltage level is output when the voltage level is lower than the second voltage level. That is, the operational amplifier 48 outputs the first binary signal Vc1 in FIG. The second and third binary signal forming circuits 44 shown in FIG.
b and 44c can also be formed on the same principle as the first binary signal forming circuit 44a. That is, the second binary signal forming circuit 44b adds the second position detection signal Vh2 and the third position detection signal Vh3 at a ratio of 2: 1 to form a second delay position signal Vh2 '. The third and third binary signal forming circuit 44c adds the third position detection signal Vh3 and the first position detection signal Vh1 at a ratio of 2: 1 to generate a third delay position signal Vh3 '. Form.

The first, second and third delay phase signals Vh1 ', Vh2' and Vh3 'in FIG.
And the third position detection signals Vh1, Vh2, and Vh3 whose phases are shifted in the delay direction by 30 degrees. Therefore, the first, second and third waveform shaping circuits 4 comprising comparators
The first, second and third binary signals Vc1, Vc2 and Vc3 of FIG. 10 are obtained from 6a, 46b and 46c. The first, second, and third binary signals Vc1, Vc2, and Vc3 in FIG. 10 correspond to those obtained by delaying the binary signal indicated by the same symbol in FIG. 5 by 30 degrees. The first, second and third binary signals Vc, Vc in FIG.
2, the phase of Vc3 is the second, third and first differential output voltage Vd
2, Vd3, and Vd1, and the first, second, and third speed detection signals Vs1, Vs2, and Vs3 obtained at the output stages of the switches 41, 42, and 43 in FIG. 7 are as shown in FIG. A positive half-wave of 0 to 180 degrees. The adder 45 of FIG. 7 adds the three-phase positive half-waves of FIG. 10 and outputs the DC speed detection signal Vt of FIG. The maximum ripple rate ΔV of the speed detection signal Vt in FIG. 10 is 13%, and the ripple rate (5
0%).

The motor device of the third embodiment is substantially the same as that of the first embodiment except for the 30-degree delay circuits 47a, 47b and 47c. It also has the same effect as.

[0033]

Fourth Embodiment A brushless DC motor device according to a fourth embodiment has a speed control signal forming circuit 50 in which the speed detecting circuit 6 and the error amplifier 8 shown in FIG.
, And the other configuration is the same as that of FIG.

The speed control signal forming circuit 50 in FIG. 11 is configured to have both functions of the speed detecting circuit 6a in FIG. 7 and the error amplifier 8 in FIG. That is, the speed control signal forming circuit 50 includes first, second, and third buffer amplifiers 35, 36, and 37, first, second, and third switches 41, 42, and 43 for positive half-wave extraction, Fourth, fifth and sixth switches for discharge 51, 52, and 53, first, second, and third binary signal forming circuits 44a, 44b, and 44c, and first, second, and third inversions Circuits 54, 55, 56, an operational amplifier (operational amplifier) 57, a reference voltage source 58, a target speed signal inverting circuit 59, first, second and third capacitors C1, C2, C3, first, It has second, third, fourth and fifth resistors R1, R2, R3, R4, R5.

The first, second and third position detection signal lines 31, 32 and 33 in FIG. 11, the first, second and third amplifiers 35, 36 and 37, the first, second and third 3 switches 41, 42, 43, first, second, and third binary signal forming circuits 44a, 44b, 44c, and first, second
The third and third waveform shaping circuits 46a, 46b, 46c and the first, second, and third delay circuits 47a, 47b, 47c are substantially the same as those shown in FIG. is there. In FIG. 11, the first, second and third amplifiers 3
5, 36, 37 and the first, second and third switches 41,
C1 R1 series circuit 38 connected between
a, C2 R2 series circuit 39a, C3 R3 series circuit 40a
Are the first, second and third differentiating circuits 38, 39, 4 in FIG.
It has a function corresponding to a part of 0. Hereinafter, 38a, 39a, and 40a in FIG. 11 are referred to as first, second, and third CR series circuits.

The operational amplifier 57 is provided as a component of a differentiating circuit and an adding circuit. One input terminal of the operational amplifier 57 includes first, second, and third switches 41, 4
2, 43 and the first, second and third CR series circuits 3
8a, 39a, 40a and a fourth resistor R4
Target speed signal line 7a through the
It is connected to the. A fifth resistor R5 is connected between one input terminal and the output terminal of the operational amplifier 57 as a feedback resistor. A reference voltage source 58 for providing a reference voltage Er = 2.5 V is connected between the other input terminal of the operational amplifier 57 and the ground. The reference voltage source 58 is connected to the first, second, and third CR series circuits 38a, 39a, via the fourth, fifth, and sixth switches 51, 52, 53.
40a. Fourth, fifth, and sixth switches 51, 52, and 53 output the outputs of the third, first, and second binary signal forming circuits 44c, 44a, and 44b to first, second, and third inverting circuits. The first, second and third switches 41, 4 are controlled by signals inverted in phase at 54, 55, 56.
It operates in the reverse of 2,43. The fourth, fifth and sixth switches 51, 52 and 53 are first, second and third switches 4.
This is for resetting (discharging) the first, second and third capacitors C1, C2 and C3 during the OFF periods of 1, 42 and 43.

The circuit of FIG. 11 corresponds to the speed detection circuit 6a of FIG.
Operates in a manner similar to the configuration obtained by adding the error amplifier 8 of FIG.

The binary signal forming circuits 44a and 44 shown in FIG.
The first, second, and third binary signals Vc1, Vc2, and Vc3 shown in FIG. 10 are obtained from b and 44c as in FIG. The first, second and third switches 41, 42, 43 are third,
The first and second binary signals Vc3, Vc1, and Vc2 are turned on during a high level period and turned off during a low level period. The fourth, fifth, and sixth switches 51, 52, and 53 are turned on during the low-level periods of the third, first, and second binary signals Vc3, Vc1, and Vc2, and turned off during the high-level periods. Now, assuming that only the first position detection signal Vh1 is input, the first switch 41 is turned on during the ON period of the first switch 41 (for example, t9 to t15 in FIG. 10) based on the third binary signal Vc3. Differential output voltage V
The positive half-wave of d1 is extracted, and the first capacitor C1 is discharged during the ON period of the fourth switch 51 (for example, from t3 to t9), and a signal similar to the first speed detection signal Vs1 in FIG. Can be Assuming that only the second position detection signal Vh2 is generated in the circuit of FIG. 11, the second and fifth switches 42 and 52 are controlled based on the first binary signal Vc1,
A signal corresponding to the second speed detection signal Vs2 in FIG. 10 is obtained. Assuming that only the third position detection signal Vh3 is generated in the circuit of FIG.
3 and 53 are controlled based on the second binary signal Vc2, and a signal corresponding to the third speed detection signal Vs3 in FIG. 10 is obtained.

In the circuit of FIG. 11, the output terminals of the first, second, and third switches 41, 42, and 43 are connected in common, and this is connected to one input terminal of an operational amplifier 57. , Fifth and sixth switches 51, 52,
53 are commonly connected to the output terminal
8 is connected. Therefore, if the target speed signal Vr is ignored, the first, second, and third position detection signals Vh1,
When Vh2 and Vh3 are simultaneously input, a signal corresponding to the DC speed detection signal Vt obtained by adding the first, second and third speed detection signals Vs1, Vs2 and Vs3 shown in FIG. . Therefore, although the speed control signal Vcon is not shown in FIG. 10, the speed control signal Vcon is obtained by subtracting the target speed signal Vr from the speed detection voltage Vt. It should be noted that the inventions of claims 3, 4, 15, and 16 correspond to those in which the line 7a target speed signal Vr is input to the operational amplifier 57 in FIG.

The operational amplifier 57 shown in FIG. 11 functions not only for differentiation and addition but also as an error amplifier for forming the speed control signal Vcon. That is, the target speed signal Vr of the target speed line 7a is converted into -Vr by the inversion circuit 59,
The signal is input to one input terminal of the operational amplifier 57 via the fourth resistor R4. Therefore, when the first, second and third switches 41, 42 and 43 are on, current flows into the feedback resistor R5 through these switches 41, 42 and 43. On the other hand, the current flowing through the feedback resistor R5 based on the negative target speed signal -Vr flows in the direction from the feedback resistor R5 into the target speed inverting circuit 59.
, A current subtraction occurs, resulting in the operational amplifier 57
At the output stage, a speed control signal Vcon indicating the difference between the speed detection voltage Vt and the target speed signal Vr is obtained.

The fourth embodiment has the same effects as the first to third embodiments. Further, differentiation, addition and error signal formation can be achieved by one operational amplifier 57, and the circuit configuration is simple. It also has the effect of becoming In addition, the first and second
Since the DC offset component is removed by the third capacitors C1, C2, and C3 and only the AC component is sent to the operational amplifier 57, the offset can be removed easily. In addition, the fourth and fifth
And the reset of the first, second and third capacitors C1, C2, C3 can be reliably and easily achieved by the sixth switch 51, 52, 53. Claims 3, 4,
In FIG. 11, the target speed line 7a, the inverting circuit 59, and the resistor R4 can be omitted in order to obtain the circuits according to the inventions of FIGS. In the case of such a deformation, a direct-current speed detection voltage Vt is obtained from the operational amplifier 57 in the same manner as in FIG. Thereby, the same effect as in the first and fourth embodiments can be obtained.

[0042]

Fifth Embodiment Next, a fifth embodiment will be described with reference to FIGS. However, in FIG. 12 and FIG. 13, portions common to FIG. 7, FIG. 10 and FIG. FIG. 12 shows the speed detection circuit 6b of the brushless DC motor according to the fifth embodiment.
This is a modification of the speed control signal forming circuit 50 of FIG.
That is, the speed detection circuit 6b of FIG. 12 is configured to output the speed detection signal Vt by omitting the inversion circuit 59 and the resistor R4 from the speed control signal forming circuit 50 of FIG. Second and third position detection signals Vh1, Vh
2, a fourth operational amplifier 60, a fourth operational amplifier 60, 1 except that a resistor R6 and an adding resistor R7 are provided.
The configuration is the same as that of the first speed control signal forming circuit 50. The first input terminal (negative terminal) of the second operational amplifier 60 is connected to the output terminals of the fourth, fifth, and sixth switches 51, 52, and 53, respectively. Second operational amplifier 60
The second input terminal (positive terminal) is connected to a reference voltage source 58. The second feedback resistor R6 is connected between the first input terminal and the output terminal of the second operational amplifier 60. The output terminal of the second operational amplifier 60 is connected to the first input terminal of the first operational amplifier 57 via the resistor R7. The first input terminal of the first operational amplifier 57 in FIG. 12 has the first, second, and third switches 41, as in FIG.
The second input terminal is connected to a reference voltage source 58.

The binary signal forming circuits 44a and 44 shown in FIG.
The first, second and third binary signals Vc1, Vc2 and Vc3 shown in FIG. 13 are obtained from b and 44c as in FIG. The first, second and third switches 41, 42, 43 are third,
The first and second binary signals Vc3, Vc1, and Vc2 are turned on during a high level period and turned off during a low level period. The fourth, fifth, and sixth switches 51, 52, and 53 are turned on during the low-level periods of the third, first, and second binary signals Vc3, Vc1, and Vc2, and turned off during the high-level periods. Now, assuming that only the first position detection signal Vh1 is input, the first differential output voltage is set in the ON period (for example, t9 to t15) of the first switch 41 based on the third binary signal Vc3. A positive half-wave of Vd1 is extracted, and a negative half-wave of the first differential output voltage Vd1 is extracted during the ON period of the fourth switch 51 (for example, from t3 to t9), and the first speed detection signal of FIG. Vs1 is obtained. The first speed detection signal Vs1 in FIG. 13 corresponds to the full-wave rectified waveform of the first differential output voltage Vd1 in FIG. Assuming that only the second position detection signal Vh2 is generated in the circuit of FIG. 12, the second and fifth switches 42 and 52 are controlled based on the first binary signal Vc1, and the second and fifth switches 42 and 52 of FIG. 2 speed detection signal Vs2 is obtained. Assuming that only the third position detection signal Vh3 is generated in the circuit of FIG. 12, the third and sixth switches 43 and 53 are controlled based on the second binary signal Vc2, and the third and fourth switches of FIG. 3 is obtained.

In the circuit of FIG. 12, the output terminals of the first, second, and third switches 41, 42, and 43 are connected in common, and this is connected to the first input terminal of the first operational amplifier 57. Also, the fourth, fifth and sixth switches 51,
The output terminals of 52 and 53 are commonly connected, and this is connected to the first input terminal of the second operational amplifier 60. The output terminal of the second operational amplifier 60 is connected to the first input terminal of the first operational amplifier 57. Accordingly, the second operational amplifier 60 outputs a composite of negative half-wave rectified waveforms of the first, second and third differential outputs of the voltages Vd1, Vd2 and Vd3. Further, the first operational amplifier 57 includes first, second and third operational amplifiers.
, The positive half-wave rectified waveforms of the differential output voltages Vd1, VVd2, and Vd3 are combined, and at the same time, the output of the second operational amplifier 60 is combined. As a result, the speed detection circuit 6b shown in FIG.
And when the third position detection signals Vh1, Vh2, and Vh3 are simultaneously input, the DC speed detection signal Vt obtained by adding the first, second, and third speed detection signals Vs1, Vs2, and Vs3 shown in FIG. It is obtained from the first operational amplifier 57. Therefore, the ripple of the DC speed detection voltage Vt is relatively small. FIG.
The speed detection voltage Vt on the line 34 is sent to the one corresponding to the error amplifier 8 in FIG. 1 and used to generate the speed control signal Vcon.

The fifth embodiment has the same effects as those of the first to fourth embodiments, and further has a speed detection voltage Vt with a small ripple.
Is also obtained.

[0046]

Sixth Embodiment A speed control signal forming circuit 50a of a sixth embodiment shown in FIG. 14 is the same as that of FIG. 12 except that an inverting circuit 59 and a resistor R4 are added to the speed detecting circuit 6b of FIG. This is equivalent to the configuration described above. The inverting circuit 59 and the resistor R4 in FIG. 14 are substantially the same as those indicated by the same reference numerals in FIG. is there.

The operational amplifier 57 shown in FIG. 14 functions as an error amplifier for forming the speed control signal Vcon in addition to the one for differentiation and the addition. That is, the target speed signal Vr of the target speed line 7a is converted into -Vr by the inversion circuit 59,
The signal is input to the first input terminal of the first operational amplifier 57 via the fourth resistor R4. The current flowing in the feedback resistor R5 based on the negative target speed signal -Vr flows in the inversion circuit 59 from the feedback resistor R5.
5 causes a current subtraction, resulting in an operational amplifier 5
At the output stage 7, a speed control signal Vcon indicating the difference between the speed detection voltage Vt and the target speed signal Vr is obtained.

The sixth embodiment has the same effect as the fourth and fifth embodiments.

[0049]

Seventh Embodiment A speed detection circuit 6c of a seventh embodiment shown in FIG. 15 is a modification of the speed detection circuit 6b of FIG. 12, and the second operational amplifier 60 is replaced with a first operational amplifier 57.
Without connecting to the first input terminal, an inverting circuit 70 and an adder 71 are provided. The output of the first operational amplifier 57 and the inverted signal of the output of the second operational amplifier 60 are added by the adder 71 Other than obtaining the speed detection signal, it corresponds to the same configuration as in FIG. A full-wave rectified waveform of the same differential signal as the speed detection signal Vt shown in FIG. 12 is obtained from the adder 71. Therefore, the seventh embodiment has the same effect as the fifth embodiment.

[0050]

Eighth Embodiment FIG. 16 shows a motor speed control device having a brush to which the present invention is applied. Motor 1 in FIG.
a comprises a stator 9a rotor 10a and a brush assembly 80. As schematically shown in FIG. 17, the stator 9a includes a pair of magnets 86 and 87. The rotor 10a includes a winding 85 and a core (not shown). Winding 85 is made of brushes 81 and 8
2, and is connected to a motor control and drive circuit 2a. The motor control and drive circuit 2a comprises a DC power supply 16 and a speed control circuit 17 configured in the same manner as in FIG. The speed control circuit 17 has a function of controlling the power supplied from the DC power supply 16 to the winding 85.

The shaft 83 to which the rotor 10a is connected is connected to the center of the disc-shaped magnet 84. Therefore, the disk-shaped magnet 84 rotates according to the rotor 10a. The disc-shaped magnet 84 has eight N-pole regions and eight S-pole regions alternately divided in the circumferential direction. The first, second, and third hole elements 3, 4, and 5, the speed detection circuit 6, the target speed signal generator 7, and the error amplifier 8 in FIG. 16 are denoted by the same reference numerals in FIG. It is configured identically. 1st, 2nd
The third hole elements 3, 4, and 5 are fixed to, for example, a stator 9a so that a magnetic flux generated by the disk-shaped magnet 84 can be detected. The electrical angle between the first, second and third hole elements 3, 4, 5 is shown in FIG.
As in the case of (1), the mutual relationship between the disc-shaped magnet 84 in FIG. 16 and the first to third hole elements 3 to 5 has an N pole and an S pole in FIG. The relationship between the rotor 10 and the first to third hole elements 3 to 5 is the same. Therefore,
The rotor 10a and the disc-shaped magnet 84 are relatively relative to the stator 9a.
Is rotated, the first to third hole elements 3 to 5 move from FIG.
As shown by Vh1, Vh2, and Vh3, a sine-wave three-phase AC voltage having a mutual phase difference of 120 degrees is obtained. This allows
16, the speed of the motor 1a can be detected in the same manner as in FIG. Therefore, the same effects as in the first embodiment can be obtained also in the eighth embodiment.

The method of detecting the rotational speed using the disk-shaped magnet 84 shown in FIG. 16 is not limited to the embodiment shown in FIG.
It can also be applied to the embodiments of FIGS. 7, 11, 12, 14, and 15 and their modifications. That is, the technique of the speed control signal forming circuit in the inventions of claims 1 to 12 is applied to the rotor 10a as described in the inventions of claims 13 to 24.
Can be applied to those having a magnet 84 coupled to the magnet.

[0053]

[Modifications] The present invention is not limited to the above-described embodiment, and for example, the following modifications are possible. (1) The third embodiment of FIG. 7, the fourth embodiment of FIG. 11, the fifth embodiment of FIG. 12, the sixth embodiment of FIG. 14, the seventh embodiment of FIG. Also in the eighth embodiment, the third position detection signal Vh3 can be created by the third position detection signal forming circuit 49a of the second embodiment in FIG. (2) In FIGS. 5, 10, and 13, the polarity of the first, second, and third speed detection signals Vs1, Vs2, and Vs3 can be inverted. 5 and 10 and FIG.
In 3, the negative half-wave side of the differential output voltages Vd1, Vd2, Vd3 can be extracted by the first, second and third switches 41, 42, 43. (3) Claims 3, 5, 7, 9, 11, 15, 17, 19,
11 and FIG.
2, 14 and 15, the delay circuit 47
a, 47b and 47c are omitted and the waveform shaping circuits 46a and 46c are omitted.
The input terminals of b, 46c can be connected to amplifiers 35, 36, 37.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a brushless DC motor device according to a first embodiment.

FIG. 2 is a diagram showing a cross section of a motor main body in FIG. 1 and an arrangement of Hall elements.

FIG. 3 is a circuit diagram illustrating a motor control and drive circuit of FIG. 1 in principle;

FIG. 4 is a block diagram illustrating a speed detection circuit of FIG. 1;

FIG. 5 is a waveform chart showing voltages of respective parts in FIG.

FIG. 6 is a diagram illustrating a cross section of a motor main body, an arrangement of two Hall elements, and a third position detection signal forming circuit according to a second embodiment.

FIG. 7 is a block diagram illustrating a speed detection circuit according to a third embodiment.

8 is a circuit diagram illustrating a first 30-degree delay circuit and a first waveform shaping circuit of FIG. 7;

FIG. 9 is a vector diagram for explaining formation of a 30-degree delayed signal by the circuit of FIG. 8;

FIG. 10 is a waveform chart showing voltages at respective parts in FIG. 7;

FIG. 11 is a block diagram showing a speed control signal forming circuit according to a fourth embodiment.

FIG. 12 is a block diagram illustrating a speed detection circuit according to a fifth embodiment.

FIG. 13 is a waveform chart showing a state of each unit in FIG. 11;

FIG. 14 is a block diagram illustrating a speed control signal forming circuit according to a sixth embodiment.

FIG. 15 is a block diagram illustrating a speed detection circuit according to a seventh embodiment.

FIG. 16 is a block diagram showing a motor and a speed control device thereof according to an eighth embodiment.

FIG. 17 is a block diagram showing the motor of FIG. 16 and its drive control circuit.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Motor main body part 2 Motor control and drive circuit 3, 4, 5, 1st, 2nd, and 3rd Hall element 6 Speed detection circuit 7 Target speed signal generator 8 Error amplifier 38, 39, 40 Differentiating circuits 41, 42, 43 first, second and third speed detection switches 45 adders 46a, 46b, 46c waveform shaping circuits 47a, 47b, 47c 30 degree delay circuits

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5H560 AA04 BB04 BB07 BB12 DA02 DA19 DB02 DB20 DC01 EB01 JJ13 JJ15 RR01 SS01 TT06 TT07 UA02 XA04 XA12

Claims (28)

[Claims] A first, a second, and a third stator winding, a rotor composed of a permanent magnet, and a fixed positional relationship with respect to the first, second, and third stator windings. A plurality of magneto-electric conversion elements arranged to have the first, second, and third phase stator windings based on outputs of the plurality of magneto-electric conversion elements indicating a change in a magnetic field according to rotation of the permanent magnet. Position detecting means for sequentially generating first, second, and third position detection signals indicating a relative positional relationship between a line and the permanent magnet with a phase difference of 120 degrees, the first and second position detection signals; And switching the exciting currents of the first, second and third stator windings based on the third position detection signal, and rotating the rotor to a target speed. And a speed of a brushless DC motor comprising: an exciting control means for controlling an exciting current of the third stator winding. An apparatus for forming a degree control signal, wherein the first, second and third position detection signals are differentiated respectively and the first, second and third position detection signals are differentiated by 9
First, second, and third differentiating circuits for forming first, second, and third differential signals having a leading phase of 0 degrees, and based on the first, second, and third position detection signals. Forming first, second and third binary signals which are synchronized with the first, second and third position detection signals and each comprise a first voltage level and a second voltage level; A first, a second, and a third binary signal forming circuit, and the first differential signal obtained from the first differentiating circuit is converted into a first binary signal only during a period of the first voltage level of the third binary signal. A first switch for passing the signal; and a second switch for passing the second differential signal obtained from the second differentiating circuit only during the first voltage level of the first binary signal. The third differential signal obtained from the third differentiating circuit as the first binary signal A third switch that passes only during the period of the voltage level of: a. Addition means that adds the outputs of the first, second, and third switches to output a rotation speed detection signal of the rotor; A target rotation speed signal generating means for generating a signal indicating a target rotation speed, a value corresponding to a difference between the signal indicating the target rotation speed and the rotation speed detection signal is determined, and this value is used as a speed control signal for the excitation control. A speed control signal forming device for a motor, comprising a calculating means for supplying the means to the means. 2. A fixed positional relationship with respect to first, second and third stator windings, a rotor made of a permanent magnet, and the first, second and third stator windings. A plurality of magneto-electric conversion elements arranged to have the first, second, and third phase stator windings based on outputs of the plurality of magneto-electric conversion elements indicating a change in a magnetic field according to rotation of the permanent magnet. Position detecting means for sequentially generating first, second, and third position detection signals indicating a relative positional relationship between a line and the permanent magnet with a phase difference of 120 degrees, the first and second position detection signals; And switching the exciting currents of the first, second and third stator windings based on the third position detection signal, and rotating the rotor to a target speed. And a speed of a brushless DC motor comprising: an exciting control means for controlling an exciting current of a third stator winding. An apparatus for forming a degree control signal, wherein the first, second and third position detection signals are differentiated respectively and the first, second and third position detection signals are differentiated by 9
First, second, and third differentiating circuits for forming first, second, and third differential signals having a leading phase of 0 degrees, and based on the first, second, and third position detection signals. First, second, and third binary signals each having a phase lag of 30 degrees from the first, second, and third position detection signals and each including a first voltage level and a second voltage level. First, second, and third binary signal forming circuits for forming a signal; and the first differential signal obtained from the first differentiating circuit being converted to the first voltage of the third binary signal. A first switch for passing only during a level period; and passing the second differential signal obtained from the second differentiating circuit only during a period of the first voltage level of the first binary signal. A second switch, the third differential signal obtained from the third differentiating circuit being a second binary signal A third switch that allows the signal to pass only during the first voltage level, and an adding unit that adds the outputs of the first, second, and third switches and outputs a rotation speed detection signal of the rotor. A target rotation speed signal generating means for generating a signal indicating a target rotation speed of the rotor; obtaining a value corresponding to a difference between the signal indicating the target rotation speed and the rotation speed detection signal; A speed control signal forming device for a motor, comprising: arithmetic means for supplying a signal to the excitation control means. 3. A fixed positional relationship with respect to first, second and third stator windings, a rotor composed of a permanent magnet, and the first, second and third stator windings. A plurality of magneto-electric conversion elements arranged to have the first, second, and third phase stator windings based on outputs of the plurality of magneto-electric conversion elements indicating a change in a magnetic field according to rotation of the permanent magnet. Position detecting means for sequentially generating first, second, and third position detection signals indicating a relative positional relationship between a line and the permanent magnet with a phase difference of 120 degrees, the first and second position detection signals; And switching the exciting currents of the first, second and third stator windings based on the third position detection signal, and rotating the rotor to a target speed. And a speed of a brushless DC motor comprising: an exciting control means for controlling an exciting current of the third stator winding. An apparatus for forming a degree control signal, wherein the apparatus is synchronized with the first, second, and third position detection signals based on the first, second, and third position detection signals, and each includes: First, second, and third binary signal forming circuits forming first, second, and third binary signals each having a first voltage level and a second voltage level; A first, a second, and a third capacitor connected in series to transmission lines for the second and third position detection signals, and a speed detection signal, the first and second input terminals and the output; An operational amplifier having a terminal, a feedback resistor connected between a first input terminal and an output terminal of the operational amplifier, and a reference potential connected to a second input terminal of the operational amplifier. A reference potential means for applying; a first input terminal of the first capacitor and the operational amplifier; And a first switch that is turned on only in the period of the first voltage level in response to the third binary signal, and a second switch of the second capacitor and the operational amplifier. A second switch connected between the third capacitor and the first input terminal, the second switch being turned on only in the period of the first voltage level in response to the first binary signal; A third switch connected between the first input terminal of the operational amplifier and being turned on only in the period of the first voltage level in response to the second binary signal; A fourth switch, which is connected between the first capacitor and the reference potential means and is turned on only in the period of the second voltage level in response to the third binary signal; A first capacitor connected between the capacitor and the reference potential means; A fifth switch which is turned on only in the period of the second voltage level in response to the binary signal, and which is connected between the third capacitor and the reference potential means; A sixth switch that is turned on only in the period of the second voltage level in response to the value signal; a target rotation speed signal generating unit that generates a signal indicating a target rotation speed of the rotor; Determine a value corresponding to the difference between the signal indicating the rotation speed and the rotation speed detection signal obtained from the operational amplifier,
A speed control signal forming device for a motor, comprising: arithmetic means for supplying the excitation control means with this value as a speed control signal. 4. A fixed positional relationship with respect to first, second and third stator windings, a rotor made of a permanent magnet, and the first, second and third stator windings. A plurality of magneto-electric conversion elements arranged to have the first, second, and third phase stator windings based on outputs of the plurality of magneto-electric conversion elements indicating a change in a magnetic field according to rotation of the permanent magnet. Position detecting means for sequentially generating first, second, and third position detection signals indicating a relative positional relationship between a line and the permanent magnet with a phase difference of 120 degrees, the first and second position detection signals; And switching the exciting currents of the first, second and third stator windings based on the third position detection signal, and rotating the rotor to a target speed. And a speed of a brushless DC motor comprising: an exciting control means for controlling an exciting current of a third stator winding. An apparatus for forming a degree control signal, wherein the phase is delayed by 30 degrees from the first, second, and third position detection signals based on the first, second, and third position detection signals. First, second, and third binary signal forming circuits for forming first, second, and third binary signals each having a first voltage level and a second voltage level; and A first, a second, and a third capacitor connected in series to transmission lines for the first, second, and third position detection signals; and a first and a second capacitor for outputting a speed detection signal. An operational amplifier having an input terminal and an output terminal; a feedback resistor connected between a first input terminal and an output terminal of the operational amplifier; and a feedback resistor connected to a second input terminal of the operational amplifier. Reference potential means for providing a reference potential, the first capacitor and the operational amplifier A first switch connected between the first input terminal and being turned on only in the period of the first voltage level in response to the third binary signal; A second switch connected between the first input terminal of the operational amplifier and being turned on only in the period of the first voltage level in response to the first binary signal; And a third switch connected between the capacitor No. 3 and a first input terminal of the operational amplifier and turned on only during the first voltage level in response to the second binary signal. And a fourth switch connected between the first capacitor and the reference potential means and turned on only in the period of the second voltage level in response to the third binary signal. Connected between the second capacitor and the reference potential means A fifth switch that is turned on only in the period of the second voltage level in response to the first binary signal, and is connected between the third capacitor and the reference potential means. A sixth switch that is turned on only in the period of the second voltage level in response to the second binary signal; and a target rotation speed signal that generates a signal indicating a target rotation speed of the rotor. Generating means, a value corresponding to a difference between the signal indicating the target rotation speed and the rotation speed detection signal obtained from the operational amplifier,
A speed control signal forming device for a motor, comprising: arithmetic means for supplying the excitation control means with this value as a speed control signal. 5. A fixed positional relationship with respect to first, second and third stator windings, a rotor composed of a permanent magnet, and the first, second and third stator windings. A plurality of magneto-electric conversion elements arranged to have the first, second, and third phase stator windings based on outputs of the plurality of magneto-electric conversion elements indicating a change in a magnetic field according to rotation of the permanent magnet. Position detecting means for sequentially generating first, second, and third position detection signals indicating a relative positional relationship between a line and the permanent magnet with a phase difference of 120 degrees, the first and second position detection signals; And switching the exciting currents of the first, second and third stator windings based on the third position detection signal, and rotating the rotor to a target speed. And a speed of a brushless DC motor comprising: an exciting control means for controlling an exciting current of the third stator winding. An apparatus for forming a degree control signal, wherein the apparatus is synchronized with the first, second, and third position detection signals based on the first, second, and third position detection signals, and each includes: First, second, and third binary signal forming circuits forming first, second, and third binary signals each having a first voltage level and a second voltage level; A first, a second, and a third capacitor connected in series to transmission lines for the second and third position detection signals, and a speed detection signal, the first and second input terminals and the output; An operational amplifier having a terminal, a feedback resistor connected between a first input terminal and an output terminal of the operational amplifier, and a reference potential connected to a second input terminal of the operational amplifier. A reference potential means for applying; a first input terminal of the first capacitor and the operational amplifier; And a first switch that is turned on only in the period of the first voltage level in response to the third binary signal, and a second switch of the second capacitor and the operational amplifier. A second switch connected between the third capacitor and the first input terminal, the second switch being turned on only in the period of the first voltage level in response to the first binary signal; A third switch connected between the first input terminal of the operational amplifier and being turned on only in the period of the first voltage level in response to the second binary signal; A fourth switch, which is connected between the first capacitor and the reference potential means and is turned on only in the period of the second voltage level in response to the third binary signal; A first capacitor connected between the capacitor and the reference potential means; A fifth switch which is turned on only in the period of the second voltage level in response to the binary signal, and which is connected between the third capacitor and the reference potential means; A sixth switch that is turned on only in the period of the second voltage level in response to a value signal, a target rotation speed signal generating unit that generates a signal indicating a target rotation speed of the rotor, A motor speed control signal forming device comprising: a means for inverting the phase of the signal indicating the target rotational speed and supplying the signal to the operational amplifier in order to obtain a speed control signal to be supplied from the amplifier to the excitation control means. 6. A fixed positional relationship with respect to the first, second and third stator windings, a rotor composed of a permanent magnet, and the first, second and third stator windings. A plurality of magneto-electric conversion elements arranged so as to have the first, second, and third phase stator windings based on outputs of the plurality of magneto-electric conversion elements indicating a change in a magnetic field according to rotation of the permanent magnet. Position detecting means for sequentially generating first, second, and third position detection signals indicating a relative positional relationship between a line and the permanent magnet with a phase difference of 120 degrees, the first and second position detection signals; And switching the exciting currents of the first, second and third stator windings based on the third position detection signal, and rotating the rotor to a target speed. And a speed of a brushless DC motor, comprising: An apparatus for forming a degree control signal, wherein the phase is delayed by 30 degrees from the first, second, and third position detection signals based on the first, second, and third position detection signals. First, second, and third binary signal forming circuits for forming first, second, and third binary signals each having a first voltage level and a second voltage level; and A first, a second, and a third capacitor connected in series to transmission lines for the first, second, and third position detection signals; and a first and a second capacitor for outputting a speed detection signal. An operational amplifier having an input terminal and an output terminal; a feedback resistor connected between a first input terminal and an output terminal of the operational amplifier; and a feedback resistor connected to a second input terminal of the operational amplifier. Reference potential means for providing a reference potential, the first capacitor and the operational amplifier A first switch connected between the first input terminal and being turned on only in the period of the first voltage level in response to the third binary signal; A second switch connected between the first input terminal of the operational amplifier and being turned on only in the period of the first voltage level in response to the first binary signal; And a third switch connected between the capacitor No. 3 and a first input terminal of the operational amplifier and turned on only during the first voltage level in response to the second binary signal. And a fourth switch connected between the first capacitor and the reference potential means and turned on only in the period of the second voltage level in response to the third binary signal. Connected between the second capacitor and the reference potential means A fifth switch that is turned on only in the period of the second voltage level in response to the first binary signal, and is connected between the third capacitor and the reference potential means. A sixth switch that is turned on only in the period of the second voltage level in response to the second binary signal; and a target rotation speed signal that generates a signal indicating a target rotation speed of the rotor. Generating means, and a means for supplying a speed control signal to be supplied to the excitation control means from the operational amplifier, the signal indicating the target rotational speed being phase inverted and supplied to the operational amplifier. Speed control signal forming device. 7. A fixed positional relationship with respect to first, second and third stator windings, a rotor composed of a permanent magnet, and the first, second and third stator windings. A plurality of magneto-electric conversion elements arranged to have the first, second, and third phase stator windings based on outputs of the plurality of magneto-electric conversion elements indicating a change in a magnetic field according to rotation of the permanent magnet. Position detecting means for sequentially generating first, second, and third position detection signals indicating a relative positional relationship between a line and the permanent magnet with a phase difference of 120 degrees, the first and second position detection signals; And switching the exciting currents of the first, second and third stator windings based on the third position detection signal, and rotating the rotor to a target speed. And a speed of a brushless DC motor comprising: an exciting control means for controlling an exciting current of the third stator winding. An apparatus for forming a degree control signal, wherein the apparatus is synchronized with the first, second, and third position detection signals based on the first, second, and third position detection signals, and each includes: First, second, and third binary signal forming circuits forming first, second, and third binary signals each having a first voltage level and a second voltage level; It has first, second, and third capacitors connected in series to transmission lines for the second and third position detection signals, first and second input terminals, and an output terminal for outputting a speed detection signal. A first operational amplifier, and a second operational amplifier having first and second input terminals and an output terminal.
An operational amplifier, a first feedback resistor connected between a first input terminal and an output terminal of the first operational amplifier, a first input terminal and an output terminal of the second operational amplifier. A second feedback resistor connected between the first and second operational amplifiers; and a reference potential means for applying a reference potential connected to second input terminals of the first and second operational amplifiers, respectively; A first switch connected between the first input terminal of the first operational amplifier and being turned on during the first voltage level in response to the third binary signal; And a second input terminal connected between the first capacitor and the first input terminal of the first operational amplifier, and turned on during the first voltage level in response to the first binary signal. And a first switch of the third capacitor and the first operational amplifier. A third switch connected between the first capacitor and the second terminal, the third switch being turned on during the period of the first voltage level in response to the second binary signal; A fourth switch connected between the first input terminal of the operational amplifier and being turned on during the second voltage level in response to the third binary signal; A fifth switch connected between a capacitor and a first input terminal of the second operational amplifier and being turned on during the second voltage level in response to the first binary signal; Connected between the third capacitor and a first input terminal of the second operational amplifier, and turned on during the second voltage level in response to the second binary signal. A sixth switch, and an output terminal of the second operational amplifier. Means for connecting to a first input terminal of an operational amplifier; target rotational speed signal generating means for generating a signal indicating a target rotational speed of the rotor; and the speed detection signal obtained from the first operational amplifier. A speed control signal forming device for a motor, comprising: a calculation means for forming a speed control signal corresponding to a difference from a signal indicating a target rotation speed and supplying the speed control signal to the excitation control means. 8. A fixed positional relationship with respect to the first, second and third stator windings, a rotor composed of a permanent magnet, and the first, second and third stator windings. A plurality of magneto-electric conversion elements arranged to have the first, second, and third phase stator windings based on outputs of the plurality of magneto-electric conversion elements indicating a change in a magnetic field according to rotation of the permanent magnet. Position detecting means for sequentially generating first, second, and third position detection signals indicating a relative positional relationship between a line and the permanent magnet with a phase difference of 120 degrees, the first and second position detection signals; And switching the exciting currents of the first, second and third stator windings based on the third position detection signal, and rotating the rotor to a target speed. And a speed of a brushless DC motor comprising: an exciting control means for controlling an exciting current of a third stator winding. An apparatus for forming a degree control signal, wherein the phase is delayed by 30 degrees from the first, second, and third position detection signals based on the first, second, and third position detection signals. First, second, and third binary signal forming circuits for forming first, second, and third binary signals each having a first voltage level and a second voltage level; and First, second, and third capacitor resistor series circuits connected in series to transmission lines for the first, second, and third position detection signals; first and second input terminals; and output of a speed detection signal. A first operational amplifier having an output terminal and a second operational amplifier having first and second input terminals and an output terminal.
An operational amplifier, a first feedback resistor connected between a first input terminal and an output terminal of the first operational amplifier, a first input terminal and an output terminal of the second operational amplifier. A second feedback resistor connected between the first and second operational amplifiers; and a reference potential means for applying a reference potential connected to second input terminals of the first and second operational amplifiers, respectively; A first switch connected between the first input terminal of the first operational amplifier and being turned on during the first voltage level in response to the third binary signal; And a second input terminal connected between the first capacitor and the first input terminal of the first operational amplifier, and turned on during the first voltage level in response to the first binary signal. And a first switch of the third capacitor and the first operational amplifier. A third switch connected between the first capacitor and the second terminal, the third switch being turned on during the period of the first voltage level in response to the second binary signal; A fourth switch connected between the first input terminal of the operational amplifier and being turned on during the second voltage level in response to the third binary signal; A fifth switch connected between a capacitor and a first input terminal of the second operational amplifier and being turned on during the second voltage level in response to the first binary signal; Connected between the third capacitor and a first input terminal of the second operational amplifier, and turned on during the second voltage level in response to the second binary signal. A sixth switch, and an output terminal of the second operational amplifier. Means for connecting to a first input terminal of an operational amplifier; target rotational speed signal generating means for generating a signal indicating a target rotational speed of the rotor; and the speed detection signal obtained from the first operational amplifier. A speed control signal forming device for a motor, comprising: a calculation means for forming a speed control signal corresponding to a difference from a signal indicating a target rotation speed and supplying the speed control signal to the excitation control means. 9. A fixed positional relationship with respect to the first, second and third stator windings, a rotor composed of a permanent magnet, and the first, second and third stator windings. A plurality of magneto-electric conversion elements arranged to have the first, second, and third phase stator windings based on outputs of the plurality of magneto-electric conversion elements indicating a change in a magnetic field according to rotation of the permanent magnet. Position detecting means for sequentially generating first, second, and third position detection signals indicating a relative positional relationship between a line and the permanent magnet with a phase difference of 120 degrees, the first and second position detection signals; And switching the exciting currents of the first, second and third stator windings based on the third position detection signal, and rotating the rotor to a target speed. And a speed of a brushless DC motor comprising: an exciting control means for controlling an exciting current of a third stator winding. An apparatus for forming a degree control signal, wherein the apparatus is synchronized with the first, second, and third position detection signals based on the first, second, and third position detection signals, and each includes: First, second, and third binary signal forming circuits forming first, second, and third binary signals each having a first voltage level and a second voltage level; First and second capacitors having first, second, and third capacitors connected in series to transmission lines for the second and third position detection signals, and first and second input terminals and output terminals, respectively. A second operational amplifier, a first feedback resistor connected between a first input terminal and an output terminal of the first operational amplifier, a first input terminal of the second operational amplifier and an output A second feedback resistor connected between the first and second operational amplifiers; and a second input terminal of the first and second operational amplifiers. Reference potential means for respectively providing a reference potential, means for connecting an output terminal of the second operational amplifier to an input terminal of the first operational amplifier, the first capacitor and the first operational amplifier A first switch connected between the first input terminal of the first capacitor and a second switch that is turned on during the period of the first voltage level in response to the third binary signal; A second switch connected between the first input terminal of the first operational amplifier and being turned on during the first voltage level in response to the first binary signal; The second capacitor is connected between the third capacitor and a first input terminal of the first operational amplifier, and is turned on during the first voltage level in response to the second binary signal. A third switch; the first capacitor; A fourth switch connected between the first input terminal of the second operational amplifier and being turned on during the second voltage level in response to the third binary signal; A second capacitor connected between the second capacitor and the first input terminal of the second operational amplifier, and turned on during the second voltage level in response to the first binary signal. And a switch connected between the third capacitor and a first input terminal of the second operational amplifier, and responsive to the second binary signal during the period of the second voltage level. A sixth switch that is turned on, a target rotation speed signal generation unit that generates a signal indicating a target rotation speed of the rotor, and a speed control signal for supplying the excitation control unit from the first operational amplifier. In order to obtain a signal which is the opposite phase of the signal indicating the target speed Means for supplying a first input terminal to the first input terminal of the first operational amplifier. 10. A fixed positional relationship with respect to first, second and third stator windings, a rotor made of a permanent magnet, and the first, second and third stator windings. A plurality of magneto-electric conversion elements arranged so as to have the first, second, and third phase stator windings based on outputs of the plurality of magneto-electric conversion elements indicating a change in a magnetic field according to rotation of the permanent magnet. Position detecting means for sequentially generating first, second, and third position detection signals indicating a relative positional relationship between a line and the permanent magnet with a phase difference of 120 degrees, the first and second position detection signals; And switching the exciting currents of the first, second and third stator windings based on the third position detection signal, and rotating the rotor to a target speed. And a magnetizing control means for controlling a magnetizing current of the third stator winding. An apparatus for forming a speed control signal, wherein the phase is delayed by 30 degrees from the first, second, and third position detection signals based on the first, second, and third position detection signals. First, second, and third binary signal forming circuits for forming first, second, and third binary signals each having a first voltage level and a second voltage level; and First, second, and third capacitors serially connected to transmission lines for the first, second, and third position detection signals, and first and second input terminals and output terminals, respectively. First and second operational amplifiers, a first feedback resistor connected between a first input terminal and an output terminal of the first operational amplifier, and a first feedback resistor of the second operational amplifier. A second feedback resistor connected between an input terminal and an output terminal; and the first and second operational amplifiers A reference potential means for applying a reference potential connected to a second input terminal, a means for connecting an output terminal of the second operational amplifier to an input terminal of the first operational amplifier, the first capacitor, A first switch connected between the first input terminal of the first operational amplifier and turned on during the first voltage level in response to the third binary signal; The first capacitor is connected between the second capacitor and a first input terminal of the first operational amplifier, and is turned on during the first voltage level in response to the first binary signal. A second switch connected between the third capacitor and a first input terminal of the first operational amplifier, and coupled to the first voltage level in response to the second binary signal; A third switch that is turned on during the period, and the first switch And a fourth switch connected between the capacitor and a first input terminal of the second operational amplifier, and turned on during the second voltage level in response to the third binary signal. Connected between the second capacitor and a first input terminal of the second operational amplifier, and turned on during the second voltage level in response to the first binary signal. And a fifth switch connected between the third capacitor and a first input terminal of the second operational amplifier, the second switch being responsive to the second binary signal. A sixth switch that is turned on during a level period, a target rotation speed signal generation unit that generates a signal indicating a target rotation speed of the rotor, Indicating the target speed to obtain the speed control signal of Means for supplying an anti-phase signal of the signal to a first input terminal of the first operational amplifier. 11. A fixed positional relationship with respect to first, second, and third stator windings, a rotor composed of a permanent magnet, and the first, second, and third stator windings. A plurality of magneto-electric conversion elements arranged to have the first, second, and third phase stator windings based on outputs of the plurality of magneto-electric conversion elements indicating a change in a magnetic field according to rotation of the permanent magnet. Position detecting means for sequentially generating first, second, and third position detection signals indicating a relative positional relationship between a line and the permanent magnet with a phase difference of 120 degrees, the first and second position detection signals; And switching the exciting currents of the first, second and third stator windings based on the third position detection signal, and rotating the rotor to a target speed. And a magnetizing control means for controlling a magnetizing current of the third stator winding. An apparatus for forming a speed control signal, wherein the apparatus is synchronized with the first, second, and third position detection signals based on the first, second, and third position detection signals, and each includes: First, second, and third binary signal forming circuits forming first, second, and third binary signals each having a first voltage level and a second voltage level; First and second capacitors having first, second, and third capacitors connected in series to transmission lines for the second and third position detection signals, and first and second input terminals and output terminals, respectively. A second operational amplifier, a first feedback resistor connected between a first input terminal and an output terminal of the first operational amplifier, a first input terminal of the second operational amplifier and an output A second feedback resistor connected between the first and second operational amplifiers; and a second input terminal of the first and second operational amplifiers. And a reference potential means for providing a reference potential, respectively connected to the first capacitor and the first input terminal of the first operational amplifier, and responsive to the third binary signal. A first switch that is turned on during the period of the first voltage level; a first switch connected between the second capacitor and a first input terminal of the first operational amplifier; A second switch that is turned on during the first voltage level in response to a value signal; and is connected between the third capacitor and a first input terminal of the first operational amplifier. A third switch that is turned on in response to the second binary signal during the first voltage level; a first input terminal of the first capacitor and a second input terminal of the second operational amplifier; In response to the third binary signal. A fourth switch that is turned on during the second voltage level; a fourth switch connected between the second capacitor and a first input terminal of the second operational amplifier; A fifth switch that is turned on during the second voltage level in response to a signal, and is connected between the third capacitor and a first input terminal of the second operational amplifier; A sixth switch that is turned on during the period of the second voltage level in response to the second binary signal, an inverting circuit connected to the second operational amplifier, and the first operation An adding unit that adds the output of the amplifier and the output of the inverting circuit to form a speed detection signal; target rotation speed signal generation unit that generates a signal indicating a target rotation speed of the rotor; and the speed detection signal. Corresponds to the difference from the signal indicating the target rotation speed Motor speed control signal forming apparatus comprising a forming a degree control signal computing means for supplying to said excitation control means. 12. A fixed positional relationship with respect to the first, second and third stator windings, a rotor composed of a permanent magnet, and the first, second and third stator windings. A plurality of magneto-electric conversion elements arranged so as to have the first, second, and third phase stator windings based on outputs of the plurality of magneto-electric conversion elements indicating a change in a magnetic field according to rotation of the permanent magnet. Position detecting means for sequentially generating first, second, and third position detection signals indicating a relative positional relationship between a line and the permanent magnet with a phase difference of 120 degrees, the first and second position detection signals; And switching the exciting currents of the first, second and third stator windings based on the third position detection signal, and rotating the rotor to a target speed. And a magnetizing control means for controlling a magnetizing current of the third stator winding. An apparatus for forming a speed control signal, wherein the phase is delayed by 30 degrees from the first, second, and third position detection signals based on the first, second, and third position detection signals. First, second, and third binary signal forming circuits for forming first, second, and third binary signals each having a first voltage level and a second voltage level; and First, second and third capacitor resistor series circuits connected in series to transmission lines for the first, second and third position detection signals, and first and second input terminals and output terminals, respectively. First and second operational amplifiers, a first feedback resistor connected between a first input terminal and an output terminal of the first operational amplifier, and a second operational amplifier of the second operational amplifier. A second feedback resistor connected between a first input terminal and an output terminal; A reference potential means for supplying a reference potential connected to a second input terminal of the operational amplifier; a third potential terminal connected between the first capacitor and a first input terminal of the first operational amplifier; A first switch that is turned on during the period of the first voltage level in response to the binary signal of the following: and between the second capacitor and a first input terminal of the first operational amplifier. A second switch that is connected and is turned on during the first voltage level in response to the first binary signal; and a first switch of the third capacitor and the first operational amplifier. A third switch that is connected between the first capacitor and the input terminal, and that is turned on during the first voltage level in response to the second binary signal; A first input terminal of the operational amplifier; A fourth switch that is turned on during the period of the second voltage level in response to the binary signal of No. 3, and between the second capacitor and a first input terminal of the second operational amplifier. A fifth switch that is turned on during the second voltage level in response to the first binary signal; and a first switch of the third capacitor and the second operational amplifier. A sixth switch connected between the second operational amplifier and the second operational amplifier, the sixth switch being turned on during the period of the second voltage level in response to the second binary signal, and connected to the second operational amplifier. An inverting circuit, an adding means for adding an output of the first operational amplifier and an output of the inverting circuit to form a speed detection signal, and a target rotational speed for generating a signal indicating a target rotational speed of the rotor. Signal generation means, the speed detection signal and a target rotation speed Motor speed control signal forming apparatus and an arithmetic means for supplying to said excitation control means to form a speed control signal corresponding to the difference between the signal shown. 13. An apparatus for generating a speed control signal for a motor having a stator and a rotor, the apparatus comprising: a magnet coupled to the rotor to rotate with the rotor; A plurality of magneto-electric conversion elements arranged so as to have a fixed positional relationship with respect to the stator and the rotor based on outputs of the plurality of magneto-electric conversion elements indicating a change in a magnetic field according to rotation of the magnet. Position detecting means for sequentially generating first, second, and third position detection signals indicating a relative position relationship with a phase difference of 120 degrees, and the first, second, and third positions Each of the detection signals is differentiated to obtain 9 for the first, second and third position detection signals.
First, second, and third differentiating circuits for forming first, second, and third differential signals having a leading phase of 0 degrees, and based on the first, second, and third position detection signals. Forming first, second and third binary signals which are synchronized with the first, second and third position detection signals and each comprise a first voltage level and a second voltage level; A first, a second, and a third binary signal forming circuit, and the first differential signal obtained from the first differentiating circuit is converted into a first binary signal only during a period of the first voltage level of the third binary signal. A first switch for passing the signal; and a second switch for passing the second differential signal obtained from the second differentiating circuit only during the first voltage level of the first binary signal. The third differential signal obtained from the third differentiating circuit as the first binary signal A third switch that passes only during the period of the voltage level of: a. Addition means that adds the outputs of the first, second, and third switches to output a rotation speed detection signal of the rotor; A target rotation speed signal generating means for generating a signal indicating a target rotation speed, a value corresponding to a difference between the signal indicating the target rotation speed and the rotation speed detection signal is determined, and this value is used as a speed control signal for the excitation control. A speed control signal forming device for a motor, comprising a calculating means for supplying the means to the means. 14. An apparatus for generating a speed control signal for a motor having a stator and a rotor, the apparatus comprising: a magnet coupled to the rotor to rotate with the rotor; A plurality of magneto-electric conversion elements arranged so as to have a fixed positional relationship with respect to the stator and the rotor based on outputs of the plurality of magneto-electric conversion elements indicating a change in a magnetic field according to rotation of the magnet. Position detecting means for sequentially generating first, second, and third position detection signals indicating a relative position relationship with each other with a phase difference of 120 degrees; and the first, second, and third positions. Each of the detection signals is differentiated, and the first, second and third position detection signals are differentiated by 9
First, second, and third differentiating circuits for forming first, second, and third differential signals having a leading phase of 0 degrees, and based on the first, second, and third position detection signals. First, second, and third binary signals each having a phase lag of 30 degrees from the first, second, and third position detection signals and each including a first voltage level and a second voltage level. First, second, and third binary signal forming circuits for forming a signal; and the first differential signal obtained from the first differentiating circuit being converted to the first voltage of the third binary signal. A first switch for passing only during a level period; and passing the second differential signal obtained from the second differentiating circuit only during a period of the first voltage level of the first binary signal. A second switch, the third differential signal obtained from the third differentiating circuit being a second binary signal A third switch that allows the signal to pass only during the first voltage level, and an adding unit that adds the outputs of the first, second, and third switches and outputs a rotation speed detection signal of the rotor. A target rotation speed signal generating means for generating a signal indicating a target rotation speed of the rotor; obtaining a value corresponding to a difference between the signal indicating the target rotation speed and the rotation speed detection signal; A speed control signal forming device for a motor, comprising: arithmetic means for supplying a signal to the excitation control means. 15. An apparatus for generating a speed control signal for a motor having a stator and a rotor, the apparatus comprising: a magnet coupled to the rotor to rotate with the rotor; A plurality of magneto-electric conversion elements arranged to have a fixed positional relationship with respect to the stator and the rotor based on outputs of the plurality of magneto-electric conversion elements indicating a change in a magnetic field according to rotation of the magnet. Position detecting means for sequentially generating first, second, and third position detection signals indicating a relative position relationship with a phase difference of 120 degrees, and the first, second, and third positions The first, second, and third signals are synchronized with the first, second, and third position detection signals based on the detection signal, and each include a first voltage level and a second voltage level. First, second and third binary signal forming circuits for forming a value signal And first, second, and third capacitors connected in series to the transmission lines for the first, second, and third position detection signals, and output speed detection signals. An operational amplifier having a second input terminal and an output terminal; a feedback resistor connected between the first input terminal and the output terminal of the operational amplifier; a second input terminal of the operational amplifier A reference potential means for providing a reference potential connected to the first capacitor and a first input terminal of the operational amplifier, the first capacitor being connected between the first capacitor and the first input terminal of the operational amplifier. A first switch that is turned on only during the period of the voltage level of: and a second switch connected between the second capacitor and a first input terminal of the operational amplifier, and responsive to the first binary signal. The second state which is turned on only during the period of the first voltage level A switch, connected between the third capacitor and a first input terminal of the operational amplifier, and turned on only during the first voltage level in response to the second binary signal. And a third switch connected between the first capacitor and the reference potential means, and turned on only in the period of the second voltage level in response to the third binary signal. A fourth switch, which is connected between the second capacitor and the reference potential means, and which is turned on only in the period of the second voltage level in response to the first binary signal; And a switch connected between the third capacitor and the reference potential means, and turned on only in the period of the second voltage level in response to the second binary signal. And the target rotation speed of the rotor. Target rotation speed signal generating means for generating a rotation speed signal, a value corresponding to the difference between the signal indicating the target rotation speed and the rotation speed detection signal obtained from the operational amplifier,
A speed control signal forming device for a motor, comprising: arithmetic means for supplying the excitation control means with this value as a speed control signal. 16. An apparatus for generating a speed control signal for a motor having a stator and a rotor, the apparatus comprising: a magnet coupled to the rotor to rotate with the rotor; A plurality of magneto-electric conversion elements arranged so as to have a fixed positional relationship with respect to the stator, and the stator and the rotor based on outputs of the plurality of magneto-electric conversion elements indicating a change in a magnetic field according to rotation of the magnet. Position detecting means for sequentially generating first, second, and third position detection signals indicating a relative position relationship with each other with a phase difference of 120 degrees; and the first, second, and third positions. Based on the detection signal, the first, second, and third position detection signals are delayed by 30 degrees from the first, second, and third position detection signals, and each includes a first voltage level and a second voltage level. First, second and third binary signals forming a third binary signal A value signal forming circuit, first, second and third capacitors connected in series to the transmission lines of the first, second and third position detection signals, and outputting a speed detection signal. An operational amplifier having first and second input terminals and an output terminal; a feedback resistor connected between a first input terminal and an output terminal of the operational amplifier; A reference potential means for providing a reference potential connected to the second input terminal; and a reference potential means connected between the first capacitor and the first input terminal of the operational amplifier, in response to the third binary signal. A first switch that is turned on only during the first voltage level; a first switch connected between the second capacitor and a first input terminal of the operational amplifier; ON only during the period of the first voltage level A second switch that is connected between the third capacitor and a first input terminal of the operational amplifier, the second switch being coupled to the second capacitor in response to the second binary signal. A third switch that is turned on only during a period, and is connected between the first capacitor and the reference potential means, and is connected to the third binary signal during the period of the second voltage level. A fourth switch that is turned on only during the period of the second voltage level, which is connected between the second capacitor and the reference potential means and is responsive to the first binary signal. A fifth switch that is turned on during the second voltage level, and is connected between the third capacitor and the reference potential means, in response to the second binary signal only during the period of the second voltage level. A sixth switch that is turned on, and an eye of the rotor Target rotation speed signal generating means for generating a signal indicating a target rotation speed, and a value corresponding to a difference between the signal indicating the target rotation speed and the rotation speed detection signal obtained from the operational amplifier,
A speed control signal forming device for a motor, comprising: arithmetic means for supplying the excitation control means with this value as a speed control signal. 17. An apparatus for generating a speed control signal for a motor having a stator and a rotor, the apparatus comprising: a magnet coupled to the rotor so as to rotate with the rotor; A plurality of magneto-electric conversion elements arranged so as to have a fixed positional relationship with respect to the stator and the rotor based on outputs of the plurality of magneto-electric conversion elements indicating a change in a magnetic field according to rotation of the magnet. Position detecting means for sequentially generating first, second, and third position detection signals indicating a relative position relationship with each other with a phase difference of 120 degrees; and the first, second, and third positions. The first, second, and third signals are synchronized with the first, second, and third position detection signals based on the detection signal and each include a first voltage level and a second voltage level. First, second and third binary signal forming circuits for forming a value signal And first, second, and third capacitors connected in series to the transmission lines for the first, second, and third position detection signals, and output speed detection signals. An operational amplifier having a second input terminal and an output terminal; a feedback resistor connected between the first input terminal and the output terminal of the operational amplifier; a second input terminal of the operational amplifier A reference potential means for providing a reference potential connected to the first capacitor and a first input terminal of the operational amplifier, the first capacitor being connected between the first capacitor and the first input terminal of the operational amplifier. A first switch that is turned on only during the period of the voltage level of: and a second switch connected between the second capacitor and a first input terminal of the operational amplifier, and responsive to the first binary signal. The second state which is turned on only during the period of the first voltage level A switch, connected between the third capacitor and a first input terminal of the operational amplifier, and turned on only during the first voltage level in response to the second binary signal. And a third switch connected between the first capacitor and the reference potential means, and turned on only in the period of the second voltage level in response to the third binary signal. A fourth switch, which is connected between the second capacitor and the reference potential means, and which is turned on only in the period of the second voltage level in response to the first binary signal; And a switch connected between the third capacitor and the reference potential means, and turned on only in the period of the second voltage level in response to the second binary signal. And the target rotation speed of the rotor. A target rotation speed signal generating means for generating a signal representing the target rotation speed, and obtaining a speed control signal for supplying the excitation control means from the operational amplifier to the operational amplifier by inverting the phase of the signal indicating the target rotation speed. A motor speed control signal forming device comprising: 18. An apparatus for generating a speed control signal for a motor having a stator and a rotor, the apparatus comprising: a magnet coupled to the rotor to rotate with the rotor; A plurality of magneto-electric conversion elements arranged to have a fixed positional relationship with respect to the stator and the rotor based on outputs of the plurality of magneto-electric conversion elements indicating a change in a magnetic field according to rotation of the magnet. Position detecting means for sequentially generating first, second, and third position detection signals indicating a relative position relationship with each other with a phase difference of 120 degrees; and the first, second, and third positions. Based on the detection signal, the first, second, and third position detection signals are delayed by 30 degrees from the first, second, and third position detection signals, and each includes a first voltage level and a second voltage level. First, second and third binary signals forming a third binary signal A value signal forming circuit, first, second and third capacitors connected in series to the transmission lines of the first, second and third position detection signals, and outputting a speed detection signal. An operational amplifier having first and second input terminals and an output terminal; a feedback resistor connected between a first input terminal and an output terminal of the operational amplifier; A reference potential means for providing a reference potential connected to the second input terminal; and a reference potential means connected between the first capacitor and the first input terminal of the operational amplifier, in response to the third binary signal. A first switch that is turned on only during the first voltage level; a first switch connected between the second capacitor and a first input terminal of the operational amplifier; ON only during the period of the first voltage level A second switch that is connected between the third capacitor and a first input terminal of the operational amplifier, the second switch being coupled to the second capacitor in response to the second binary signal. A third switch that is turned on only during a period, and is connected between the first capacitor and the reference potential means, and is connected to the third binary signal during the period of the second voltage level. A fourth switch that is turned on only during the period of the second voltage level, which is connected between the second capacitor and the reference potential means and is responsive to the first binary signal. A fifth switch that is turned on during the second voltage level, and is connected between the third capacitor and the reference potential means, in response to the second binary signal only during the period of the second voltage level. A sixth switch that is turned on, and an eye of the rotor A target rotation speed signal generating means for generating a signal indicating a target rotation speed, and in order to obtain a speed control signal to be supplied from the operational amplifier to the excitation control means, invert the phase of the signal indicating the target rotation speed. A motor speed control signal forming device, comprising: means for supplying the signal to the operational amplifier. 19. An apparatus for generating a speed control signal for a motor having a stator and a rotor, the apparatus comprising: a magnet coupled to the rotor to rotate with the rotor; A plurality of magneto-electric conversion elements arranged so as to have a fixed positional relationship with respect to the stator and the rotor based on outputs of the plurality of magneto-electric conversion elements indicating a change in a magnetic field according to rotation of the magnet. Position detecting means for sequentially generating first, second, and third position detection signals indicating a relative position relationship with a phase difference of 120 degrees, and the first, second, and third positions The first, second, and third signals are synchronized with the first, second, and third position detection signals based on the detection signal, and each include a first voltage level and a second voltage level. First, second and third binary signal forming circuits for forming a value signal And first, second, and third capacitors connected in series to the transmission lines for the first, second, and third position detection signals; first and second input terminals; and output of a speed detection signal. A first operational amplifier having an output terminal and a second operational amplifier having first and second input terminals and an output terminal.
An operational amplifier, a first feedback resistor connected between a first input terminal and an output terminal of the first operational amplifier, a first input terminal and an output terminal of the second operational amplifier. A second feedback resistor connected between the first and second operational amplifiers; and a reference potential means for applying a reference potential connected to second input terminals of the first and second operational amplifiers, respectively; A first switch connected between the first input terminal of the first operational amplifier and being turned on during the first voltage level in response to the third binary signal; And a second input terminal connected between the first capacitor and the first input terminal of the first operational amplifier, and turned on during the first voltage level in response to the first binary signal. And a first switch of the third capacitor and the first operational amplifier. A third switch connected between the first capacitor and the second terminal, the third switch being turned on during the period of the first voltage level in response to the second binary signal; A fourth switch connected between the first input terminal of the operational amplifier and being turned on during the second voltage level in response to the third binary signal; A fifth switch connected between a capacitor and a first input terminal of the second operational amplifier and being turned on during the second voltage level in response to the first binary signal; Connected between the third capacitor and a first input terminal of the second operational amplifier, and turned on during the second voltage level in response to the second binary signal. A sixth switch, and an output terminal of the second operational amplifier. Means for connecting to a first input terminal of an operational amplifier; target rotational speed signal generating means for generating a signal indicating a target rotational speed of the rotor; and the speed detection signal obtained from the first operational amplifier. A speed control signal forming device for a motor, comprising: a calculation means for forming a speed control signal corresponding to a difference from a signal indicating a target rotation speed and supplying the speed control signal to the excitation control means. 20. An apparatus for generating a speed control signal for a motor having a stator and a rotor, the apparatus comprising: a magnet coupled to the rotor to rotate with the rotor; A plurality of magneto-electric conversion elements arranged so as to have a fixed positional relationship with respect to the stator and the rotor based on outputs of the plurality of magneto-electric conversion elements indicating a change in a magnetic field according to rotation of the magnet. Position detecting means for sequentially generating first, second, and third position detection signals indicating a relative position relationship with a phase difference of 120 degrees, and the first, second, and third positions Based on the detection signal, the first, second, and third position detection signals are delayed by 30 degrees from the first and second position detection signals, and each of the first, second, and third position detection signals includes a first voltage level and a second voltage level. First, second and third binary signals forming a third binary signal A value signal forming circuit; first, second, and third capacitor resistor series circuits connected in series to transmission lines of the first, second, and third position detection signals; and first and second inputs. A first operational amplifier having a terminal and an output terminal for outputting a speed detection signal, and a second operational amplifier having first and second input terminals and an output terminal.
An operational amplifier, a first feedback resistor connected between a first input terminal and an output terminal of the first operational amplifier, a first input terminal and an output terminal of the second operational amplifier. A second feedback resistor connected between the first and second operational amplifiers; and a reference potential means for applying a reference potential connected to second input terminals of the first and second operational amplifiers, respectively; A first switch connected between the first input terminal of the first operational amplifier and being turned on during the first voltage level in response to the third binary signal; And a second input terminal connected between the first capacitor and the first input terminal of the first operational amplifier, and turned on during the first voltage level in response to the first binary signal. And a first switch of the third capacitor and the first operational amplifier. A third switch connected between the first capacitor and the second terminal, the third switch being turned on during the period of the first voltage level in response to the second binary signal; A fourth switch connected between the first input terminal of the operational amplifier and being turned on during the second voltage level in response to the third binary signal; A fifth switch connected between a capacitor and a first input terminal of the second operational amplifier and being turned on during the second voltage level in response to the first binary signal; Connected between the third capacitor and a first input terminal of the second operational amplifier, and turned on during the second voltage level in response to the second binary signal. A sixth switch, and an output terminal of the second operational amplifier. Means for connecting to a first input terminal of an operational amplifier; target rotational speed signal generating means for generating a signal indicating a target rotational speed of the rotor; and the speed detection signal obtained from the first operational amplifier. A speed control signal forming device for a motor, comprising: a calculation means for forming a speed control signal corresponding to a difference from a signal indicating a target rotation speed and supplying the speed control signal to the excitation control means. 21. An apparatus for generating a speed control signal for a motor having a stator and a rotor, comprising: a magnet coupled to the rotor to rotate with the rotor; A plurality of magneto-electric conversion elements arranged so as to have a fixed positional relationship with respect to the stator and the rotor based on outputs of the plurality of magneto-electric conversion elements indicating a change in a magnetic field according to rotation of the magnet. Position detecting means for sequentially generating first, second, and third position detection signals indicating a relative position relationship with each other with a phase difference of 120 degrees; and the first, second, and third positions. The first, second, and third signals are synchronized with the first, second, and third position detection signals based on the detection signal and each include a first voltage level and a second voltage level. First, second and third binary signal forming circuits for forming a value signal And first, second, and third capacitors connected in series to the transmission lines of the first, second, and third position detection signals, and first and second input terminals and output terminals, respectively. First and second operational amplifiers, a first feedback resistor connected between a first input terminal and an output terminal of the first operational amplifier, and a second operational amplifier of the second operational amplifier. A second feedback resistor connected between the first input terminal and the output terminal; reference potential means for applying a reference potential respectively connected to the second input terminals of the first and second operational amplifiers; Means for connecting an output terminal of the second operational amplifier to an input terminal of the first operational amplifier; and a means connected between the first capacitor and a first input terminal of the first operational amplifier. Responsive to the third binary signal during this first voltage level period. A first switch that is turned on; a first switch connected between the second capacitor and a first input terminal of the first operational amplifier, the first switch being responsive to the first binary signal; A second switch that is turned on during the voltage level of the first operational amplifier, is connected between the third capacitor and a first input terminal of the first operational amplifier, and is responsive to the second binary signal. A third switch that is turned on during the period of the first voltage level; and a third switch connected between the first capacitor and a first input terminal of the second operational amplifier. A fourth switch that is turned on during the period of the second voltage level in response to the binary signal of: and between the second capacitor and the first input terminal of the second operational amplifier. Connected to the second voltage level in response to the first binary signal. And a fifth switch that is turned on during the period of, and is connected between the third capacitor and a first input terminal of the second operational amplifier, and is connected to the second binary signal in response to the second binary signal. A sixth switch that is turned on during the period of the second voltage level, a target rotation speed signal generation unit that generates a signal indicating a target rotation speed of the rotor, and the excitation control from the first operational amplifier. Means for supplying a reverse phase signal of the signal indicative of the target speed to a first input terminal of the first operational amplifier to obtain a speed control signal for supplying to the means. Forming equipment. 22. An apparatus for generating a speed control signal for a motor having a stator and a rotor, comprising: a magnet coupled to the rotor to rotate with the rotor; A plurality of magneto-electric conversion elements arranged to have a fixed positional relationship with respect to the stator and the rotor based on outputs of the plurality of magneto-electric conversion elements indicating a change in a magnetic field according to rotation of the magnet. Position detecting means for sequentially generating first, second, and third position detection signals indicating a relative position relationship with each other with a phase difference of 120 degrees; and the first, second, and third positions. Based on the detection signal, the first, second, and third position detection signals are delayed by 30 degrees from the first, second, and third position detection signals, and each includes a first voltage level and a second voltage level. First, second and third binary signals forming a third binary signal A value signal forming circuit; first, second and third capacitors connected in series to transmission lines of the first, second and third position detection signals; first and second input terminals and output First and second operational amplifiers each having a terminal; a first feedback resistor connected between a first input terminal and an output terminal of the first operational amplifier; A second feedback resistor connected between a first input terminal and an output terminal of the operational amplifier, and a reference potential respectively connected to second input terminals of the first and second operational amplifiers. Reference potential means; means for connecting the output terminal of the second operational amplifier to the input terminal of the first operational amplifier; and the first capacitor and a first input terminal of the first operational amplifier. Connected between the first voltage and the first voltage in response to the third binary signal. A first switch that is turned on during a level period, and is connected between the second capacitor and a first input terminal of the first operational amplifier, and is responsive to the first binary signal. A second switch that is turned on during the period of the first voltage level; a second switch connected between the third capacitor and a first input terminal of the first operational amplifier; A third switch that is turned on during the first voltage level in response to a value signal; and is connected between the first capacitor and a first input terminal of the second operational amplifier. A fourth switch that is turned on in response to the third binary signal during the second voltage level; a first input terminal of the second capacitor and a second input terminal of the second operational amplifier; And in response to the first binary signal, A fifth switch that is turned on during a voltage level of 2; a third switch connected between the third capacitor and a first input terminal of the second operational amplifier; A sixth switch responsive to being turned on during the second voltage level; a target rotation speed signal generating means for generating a signal indicating a target rotation speed of the rotor; and the first operational amplifier. Means for supplying, to a first input terminal of the first operational amplifier, an opposite-phase signal of the signal indicating the target speed in order to obtain a speed control signal for supplying the excitation control means from Speed control signal forming device. 23. An apparatus for generating a speed control signal for a motor having a stator and a rotor, the apparatus comprising: a magnet coupled to the rotor to rotate with the rotor; A plurality of magneto-electric conversion elements arranged so as to have a fixed positional relationship with respect to the stator and the rotor based on outputs of the plurality of magneto-electric conversion elements indicating a change in a magnetic field according to rotation of the magnet. Position detecting means for sequentially generating first, second, and third position detection signals indicating a relative position relationship with each other with a phase difference of 120 degrees; and the first, second, and third positions. The first, second, and third signals are synchronized with the first, second, and third position detection signals based on the detection signal and each include a first voltage level and a second voltage level. First, second and third binary signal forming circuits for forming a value signal And first, second, and third capacitors connected in series to the transmission lines of the first, second, and third position detection signals, and first and second input terminals and output terminals, respectively. First and second operational amplifiers, a first feedback resistor connected between a first input terminal and an output terminal of the first operational amplifier, and a second operational amplifier of the second operational amplifier. A second feedback resistor connected between the first input terminal and the output terminal; reference potential means for applying a reference potential respectively connected to the second input terminals of the first and second operational amplifiers; Connected between the first capacitor and a first input terminal of the first operational amplifier, and turned on during the first voltage level in response to the third binary signal. A first switch, the second capacitor, and a first switch of the first operational amplifier. A second switch connected between the first capacitor and the input terminal of the first capacitor, and turned on during the period of the first voltage level in response to the first binary signal; A third switch connected between the first input terminal of the operational amplifier and being turned on during the period of the first voltage level in response to the second binary signal; And a fourth input terminal which is connected between the first input terminal of the second operational amplifier and the first input terminal of the second operational amplifier and is turned on during the second voltage level in response to the third binary signal. A switch, connected between the second capacitor and a first input terminal of the second operational amplifier, and turned on during the second voltage level in response to the first binary signal. A fifth switch to be in a state, the third capacitor and the second operational amplifier A sixth switch connected between the first input terminal of the switch and being turned on during the second voltage level in response to the second binary signal; An inverting circuit connected to an amplifier; an adding means for adding an output of the first operational amplifier to an output of the inverting circuit to form a speed detection signal; and generating a signal indicating a target rotational speed of the rotor. Speed control of a motor, comprising: a target rotation speed signal generating means for performing the control; and a calculation means for forming a speed control signal corresponding to a difference between the speed detection signal and a signal indicating the target rotation speed and supplying the speed control signal to the excitation control means. Signal forming device. 24. An apparatus for generating a speed control signal for a motor comprising a stator and a rotor, the apparatus comprising: a magnet coupled to the rotor to rotate with the rotor; A plurality of magneto-electric conversion elements arranged so as to have a fixed positional relationship with respect to the stator and the rotor based on outputs of the plurality of magneto-electric conversion elements indicating a change in a magnetic field according to rotation of the magnet. Position detecting means for sequentially generating first, second, and third position detection signals indicating a relative position relationship with each other with a phase difference of 120 degrees; and the first, second, and third positions. Based on the detection signal, the first, second, and third position detection signals are delayed by 30 degrees from the first, second, and third position detection signals, and each includes a first voltage level and a second voltage level. First, second and third binary signals forming a third binary signal A value signal forming circuit; first, second, and third capacitor resistor series circuits connected in series to transmission lines of the first, second, and third position detection signals; and first and second inputs. First and second operational amplifiers each having a terminal and an output terminal; a first feedback resistor connected between a first input terminal and an output terminal of the first operational amplifier; A second feedback resistor connected between a first input terminal and an output terminal of the second operational amplifier; and a reference connected respectively to second input terminals of the first and second operational amplifiers. A reference potential means for applying a potential; connected between the first capacitor and a first input terminal of the first operational amplifier, the first voltage being responsive to the third binary signal; A first switch that is turned on during a level period; A second switch connected between the first input terminal of the first operational amplifier and being turned on during the first voltage level in response to the first binary signal; The second capacitor is connected between the third capacitor and a first input terminal of the first operational amplifier, and is turned on during the first voltage level in response to the second binary signal. A third switch, connected between the first capacitor and a first input terminal of the second operational amplifier, for responding to the third binary signal, A fourth switch that is turned on during a period; and a fourth switch connected between the second capacitor and a first input terminal of the second operational amplifier, the fourth switch being responsive to the first binary signal. A fifth switch that is turned on during a second voltage level; A sixth switch connected between the capacitor and a first input terminal of the second operational amplifier, and turned on during the second voltage level in response to the second binary signal; An inverting circuit connected to the second operational amplifier; adding means for adding an output of the first operational amplifier to an output of the inverting circuit to form a speed detection signal; Target rotation speed signal generation means for generating a signal indicating a rotation speed; and calculation means for forming a speed control signal corresponding to a difference between the speed detection signal and the signal indicating the target rotation speed and supplying the signal to the excitation control means A speed control signal forming device for a motor comprising: 25. The first, second, and third binary signal forming circuits, wherein the first, second, and third position detection signals each include 30
First, second, and third delay position signal forming circuits for forming first, second, and third delay position signals delayed by degrees, and the first, second, and third delay position signals are converted to first signals. , And second and third voltage levels
3. The method according to claim 2, further comprising first, second, and third waveform shaping circuits for shaping the waveform into a binary signal of
Or 8 or 10 or 12 or 14 or 16 or 18 or 20 or 22 or 24. 26. The first delay position signal forming circuit,
A second delay position signal forming circuit that adds the first position detection signal and the second position detection signal at a ratio of 2: 1 to obtain a first delay position signal; A circuit for adding a second position detection signal and the third position detection signal at a ratio of 2: 1 to obtain a second delay position signal, wherein the third delay position signal forming circuit is 26. The motor speed control signal forming apparatus according to claim 25, wherein the circuit is a circuit for adding a third position detection signal to the third position detection signal at a ratio of 2: 1 to obtain a third delay position signal. 27. The first, second, and third magneto-electric conversion elements arranged so as to have a fixed positional relationship with respect to first, second, and third stator windings. The motor according to any one of claims 1 to 26, further comprising: an output of each of the first, second, and third magnetoelectric transducers is used as the first, second, and third position detection signals. Speed control signal forming device. 28. The position detecting means is arranged so as to have a fixed positional relationship with respect to the first and second stator windings and outputs the first and second position detection signals. And a third position having a delay phase difference of 120 degrees with respect to the second position detection signal based on the first and second position detection signals. 27. The motor speed control signal forming apparatus according to claim 1, further comprising a third position detection signal forming circuit for forming a detection signal.