JPS61218384A - Motor drive device - Google Patents

Abstract

PURPOSE:To simplify wirings and to reduce the cost by generating a current flows to a coil of each phase by a rotation detecting pulse obtained from a sensor section having a factor to be detector and a sensor corresponding to the factor to be detected, thereby deleting the number of components. CONSTITUTION:The prescribed rotation detecting pattern is formed in a factor 21 to be detected, provided on a rotor, and the pattern is detected by a sensor section 22. The output of the section 22 is input to an FG signal and PG signal generator 23, and the rotation detection signal of the repetition frequency proportional to the rotating speed in phase relative to the rotation detecting pattern of the factor 21 and the phase detection signal of the pulse corresponding to the rotating phase of the rotor in phase relative to the pattern of the factor 21 are output. The rotation detection signals are supplied to a motor driver circuit 24.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a motor drive device, and particularly to a motor drive device for driving a DC brushless motor such as a drum motor of a magnetic recording/reproducing device (VTR).

(Prior Art) Conventionally, a DC brushless motor (Hall motor) using a Hall element has been used as a drum motor for a magnetic recording/reproducing apparatus (VTR). This detects the relative position between the magnetic poles of the rotor and the armature winding (coil) using a Hall element, turns the switching element on and off according to the relative position, and turns the switching element on and off according to the relative position. The rotor is rotated in a fixed direction by sequentially switching the current flowing through the coils (an integer of In this case, in order to use the magnetic flux of the rotor's magnetic poles most effectively, one ball element is used for each phase, and the rotor's magnetic poles (for example, two values of N and S) corresponding to the coil positions are set. , the current flowing through the coil (+, O
It is necessary to correspond to the three values of , -). An m-phase Hall motor requires m Hall elements.

On the other hand, in a general helical scan type VTR, the rotational speed and rotational position of a rotating drum (cylinder) are detected, the rotation of the rotating drum is controlled according to these detection signals, and two video cameras attached to the rotating drum are controlled. Does the head accurately scan (1 to race) the desired recording (or reproduction) track on the magnetic tape? It is controlled to be 1'.

That is, in the conventional VTR described above, two magnets (magnets 1 to 1) mounted on a rotating drum at a distance of 180 degrees from each other are detected by a detection head (pickup head; PG head). The rotational phase of the rotating drum corresponding to the two video heads is detected.

In addition, a plurality of LA poles are provided at equal intervals on the rotating drum, and these multiple magnetic poles are detected by the coil of a frequency generator (FG), and the rotation of the rotating drum is generated in the form of a detection signal @(frequency of the FG multiplied signal). Detecting speed.

Here, an example of a conventional motor drive device will be described. FIG. 9 shows a block system diagram of a drum rotation control device for a conventional helical scan type VTR. I, II, and ■ shown in the lower right of FIG. 9 are three sets of coils (Denki Senmaki li!1) of the driven motor, and their terminal ends are all grounded.

In Figure 19, the PG head 1 is mounted on a rotating drum and detects two magnetic poles, and from the output from the PG head 1, rises and falls as shown in waveform a in Figure 10 are detected by rotation. A pulse (pulse) is emitted once per rotation of the drum.
A PG multiplied signal is obtained as phase information. The output of this PG head 1 is supplied to monomulti 2 and monomulti 3, and monomulti 2 is triggered by the rising edge of waveform a.
The monomulti 3 is triggered from 1 to 1 at the falling edge of waveform a, and obtains waveforms a and c, respectively. And these two mono multi 2
．． 3. Video head attached to rotating drum (not shown)
Adjust the switching position.

Furthermore, the waveform C is supplied to a flip-flop 4, which is set at the falling edge of the waveform C.
It is reset to 1 at the falling edge of waveform C.

Therefore, if the rotating drum (cylinder) is, for example, 30 rps
When rotating at , a drum pulse ([)P) having a repetition frequency of 30 Hz and a waveform d corresponding to the switching position of the video head with a decoupage ratio of 50% is obtained.

This signal of waveform d (drum pulse) is used as a switching pulse and is also supplied to the trapezoidal wave generator 5.

This trapezoidal wave generator 5 generates a trapezoidal wave synchronized with the signal of waveform d and supplies it to the sampling hold circuit 6.

On the other hand, the composite video signal 7 is supplied to a vertical synchronization signal separation circuit (① synchronization separation circuit) 8. The vertical synchronizing signal separation circuit 8 extracts only the vertical synchronizing signal of eoH, and supplies it to the sufficient frequency circuit 9. Therefore, a pulse synchronized with the video signal 301a is output from the sufficient frequency circuit 9, and this pulse is supplied to one terminal 10a (REC) of the switch circuit 10.

On the other hand, the pulse generated by the reference frequency oscillator 11 is passed through the frequency dividing circuit 12 to obtain a reference pulse of 30H2, and this reference pulse is supplied to the other terminal 10b (PB) of the switch circuit 10.

The switch circuit 10 is switched to the terminal 10a side during recording and to the terminal 10b side during playback.
:The pulses from the 1v frequency dividing circuit 9 and the frequency dividing circuit 12 are selected and supplied to the monomulti 13.

The monomulti 13 generates a 1j sampling pulse that is delayed by a certain period of time with respect to the vertical synchronization signal of the video signal of the recording assistant.

The sample bold circuit 6 uses this sampling pulse to non-pull the slope part of the trapezoidal wave and holds it to obtain a phase error voltage. This phase error voltage is supplied to a loop filter 14 whose purpose is to improve the transient characteristics of the four novo loops, and its output (phase y difference voltage) is supplied to a mixing amplifier 15.

On the other hand, the FG coil 16 detects a plurality of magnetic poles provided at equal intervals on the rotating drum, and a plurality of pulses (FG signals) existing at equal intervals are obtained from the FG coil 16 as speed information. This pulse is amplified and waveform-shaped by an FG pulse amplifier 17 and supplied to an F/V (frequency/voltage) converter 18.

The F/V converter 18 is a circuit that converts the human power signal into a voltage according to the frequency, and therefore outputs a speed error voltage corresponding to the rotation speed of the rotating drum, and the mixing amplifier 15 supplied to

The phase error voltage and speed error voltage are mixed and amplified by a mixing amplifier 15 to obtain an error voltage. This error voltage is
is supplied to the motor drive circuit 16, and this motor drive circuit 1
6 is a drive current according to the error voltage of the motor 17
, rotate and control it.

Next, the motor drive circuit 16 will be explained. The block system diagram in the figure shows a three-phase one-way drive voltage control system. This typically corresponds to each coil 1. of the motor 17. In order to determine the switching position of the current flowing through Il, I[[, three ball elements 18a, 18b,
18c is used. Ball element 18a.

The respective outputs of 18b and 18c are connected to a differential amplifier 19.
a, 19b, and 19c, and their outputs are further supplied to the logic circuit 20.

This logic circuit 20 includes the coils 1. of the motor 17. II.

This is a circuit for converting into a signal for turning on and off the switching 1 to transistors 21a, 21b, and 21c in the subsequent stages so that the current flowing in the circuit is switched at the correct position.

The output of this logic circuit 20 causes transistors 21a, 2
The output voltage of the mixing amplifier 15 is applied to the coil connected to the turned-on transistor of 1b and 21c, causing current to flow through the coil and driving the motor.

In the drum rotation control device with the above configuration, as described above, a mechanism for detecting the rotational phase (that is, two magnets and a pickup head) and a mechanism for detecting the rotational speed (multiple magnetic poles and a frequency generator) are used. These two detection mechanisms control the motor's armature coil whistling voltage. Furthermore, switching of motor drive current is performed by three Hall elements for a three-phase Hall motor.

(Problems to be Solved by the Invention) As mentioned above, in the conventional motor drive device, m
When controlling a rotating drum (cylinder) using a phase Hall motor, m Hall elements are used to switch the drive current necessary to drive the ball motor.9 Mechanism for detecting the rotational phase of the rotary drum. Three mechanisms were required (i.e., two magnets and a pickup head) to detect the rotational speed of the nine-rotation drum (multiple magnetic poles and a frequency generator). Therefore, the installation and wiring of these mechanisms become complicated, making it difficult to improve productivity and reduce costs.

Therefore, the present invention uses a detection signal detected by a negative sensor to detect a predetermined rotation detection pattern of one detected part provided on a rotating body, and drives a motor for rotating this rotating body. It is an object of the present invention to provide a motor drive device that solves the above problems by making it possible to extract phase information signals and speed information signals of a rotating body.

(Means for Solving the Problems) In order to achieve the above object, the present invention has m phases (where m is 2 or more) as shown in the block diagram of the configuration of the device of the present invention in FIG. Two kinds of physical quantities are alternately provided on the circumference of a rotating body provided on the rotor of a motor to be driven, which has a coil of !I! Object 11 The points of change from m to the other physical quantity are sequentially aI + a2...

an (however, n is an integer of 3 or more), among which the physical quantities from the change point a2 to an are made to exist at equal intervals,
The maximum value of the detected waveform of one of the two physical quantities adjacent to the change point a1 is smaller than the maximum value of the detected waveform of the other physical quantity, and the 2 types of things 1! l! The other thing in Ql 1
J, where the minimum value of the detected waveform of 1 m is larger than the minimum value of the detected waveform of the other physical quantity, detect the physical quantity of this detected part 21, such as the detected part (marker part) 21 of The sensor unit 22 having a sensor 9- of
a rotation detection signal having a phase related to the physical quantity position of the detected part 21 at which the drive current flowing through the phase is to be switched, and a repetition frequency proportional to the rotational stray electricity of the rotating body, and the detected part; A detection signal generation circuit 23 outputs a pulse phase detection signal with a phase related to the physical quantity position and corresponding to the rotational phase of the rotary body, and the rotation detection signal of the detection signal generation circuit 23 is supplied to the It is characterized by comprising a motor drive circuit 24 which generates m-phase drive pulses for the purpose of creating a rotating magnetic field for rotating the rotor and outputs them to the m-phase coils as separate drive currents. The present invention provides a motor drive device that does the following.

(Function) In the motor drive device having the above configuration, a predetermined object Dir (rotation detection pattern) of the detected part provided on the rotating body,
A rotation detection signal is generated by a detection signal obtained from a sensor section having one sensor for detecting the physical quantity, and this rotation detection signal can output a drive current to be passed through the coils of each phase of the motor. A phase information signal and a speed information signal of the rotating body can also be extracted.

(Example) An example of a motor drive device according to the present invention will be described below with reference to the drawings.

FIG. 2 shows a block system diagram of one embodiment of the device of the present invention! 1-0 In the figure, the same components as in FIG. 1 are designated by the same reference numerals. Also, the same parts as in FIG. 9 mentioned above are given the same reference numerals.

The marker portion 21 has a magnetization pattern (vA pole) applied under the conditions described below, and includes, for example, J: sea urchin that rotates integrally with the rotor of a motor that drives a rotating drum (cylinder). The body is configured with magnetization in the form of lllAt.

The reno 11 section 22 has, for example, one ball element (sensor) 25, which is provided at a position always close to the marker section 21 and detects the magnetic flux of the magnetic poles forming the marker section 21. The output detected by this sensor 25 is supplied to a differential amplifier 26. (Note that when the center 25 is configured with a ball element, it is normally received by a differential amplifier.) This differential amplifier 26 is a comparator 27A.

27B and 27G. After that, through the digital signal processing circuit 28, a pulse (PG signal) is outputted as phase information at a rate of once per rotation of the rotary drum, and a plurality of pulses that exist at equal intervals are outputted as phase information. (The FG multiplied signal is output as speed information.

The PG multiplied signal, which is phase information, has the waveform a' in Fig. 10.
A pulse like the one shown is obtained. This pulse is a monomulti 2 triggered on its rising edge and 1 to 1 on its falling edge.
By passing through the triggered monomulti 3, waveforms bl and cl shown in FIG. 10 are obtained. These waveforms b' and c' are supplied to the flip-flop 4, which is set at the falling edge of the waveform b' and reset at the falling edge of the waveform C'. Therefore, when the rotating drum rotates at, for example, 30 rps, a drum pulse (DP) having a waveform d' corresponding to the switching position of the video head with a repetition frequency of 30H2° and a duty ratio of 50% is obtained. Thereafter, the phase error voltage is supplied to the mixing amplifier 15 in the same manner as in the conventional device shown in FIG.

Further, the FG output from the digital signal processing circuit 28
The doubled signal is supplied to a mixing amplifier 15 via an FG pulse amplifier 17 and an F/V (frequency/voltage) converter 18. This FG multiplied signal is also supplied to the °[-ta drive circuit 24. That is, in the present invention, the FG multiplication signal is used for the timing of switching the motor current.

The motor drive circuit 24 includes a pulse generation circuit 29. Switch circuit means 30. Waveform conversion circuit 31 and driver circuit 32
Composed of doniri. Further, the output terminal of the driver circuit 32 is connected to the coils 1 to 2 of the Tanabata 17.

In the motor drive circuit 24 having the above configuration, the FG multiplied signal obtained from the output terminal of the digital signal processing circuit 28 constituting the FG multiplied signal and PG signal generation circuit 23, Terminal 34a
supplied to

At startup or at low speed, the changeover switch 34 is switched to the terminal 34[) side, and the output from the pulse generation circuit 29 is supplied to the ring counter 36 and the waveform conversion logic circuit 37, respectively. Therefore, the output terminals Ql, Q2 . For Q3, the output signal is Q1→Q2→Q3
Pulses are output in this order. Then, this pulse is passed through the waveform conversion logic circuit 37 to the i-transistors T+ and T2.
．． applied to T3 and further connected to transistors T II,
Turn on T I2 and T I3 in sequence.

As a result, coil 1. n, nr, I, If,
The drive current switches in this order, and a rotating magnetic field in the forward rotation direction is generated. Therefore, the main magnetic pole of the motor rotor rotates in the forward rotation direction in synchronization with the rotating magnetic field generated.

On the other hand, when the motor reaches a certain speed or higher (steady rotational speed), the changeover switch 34 is switched to the terminal 34a side by the output of the retriggerable monomultiplier 33, and the FG double signal is supplied to the ring counter 36. .

As a result, a rotating magnetic field is generated in the forward rotation direction, and the motor drive current can be switched at the correct current switching point, so that the motor rotor rotates continuously.

Further, in the embodiment of the present invention, as shown in FIG. 3, the rotation of the rotating drum is controlled by a direct drive motor in which the rotating drum (cylinder) and the driven motor are directly connected. There is. As for the structure of the driven E-tor, the main V11 pole (main magnet) 38 is installed integrally with the rotor (rotor) 39.
The rotating body 401 that has been
There are markers 41 that are magnetized around ten times the circumference. Also,
The stator 42 includes an armature coil (hereinafter referred to as a coil).
A sensor 25 is provided at a position opposite to the marker 41. Also, motor shirt 1~
A rotary drum 44 is connected by 43, and two video heads (magnetic heads) 4 are connected to this rotary drum 44.
5a and 45b are separated several times at 180 degree intervals.

FIG. 4 is a diagram showing the arrangement relationship when main parts of the driven motor shown in FIG. 3 are viewed from above, showing the magnetized state of the main magnetic pole 38 of the rotor 39 and the arrangement of coils 1 to 2.

Position 1 of the sensor 25 represents the magnetized state of the marker 41 of the rotating body 40. Furthermore, the positions of the two video heads 45a and 45b are also noted. In addition, in the figure, the forward rotation direction of the motor is rotated once in the opposite direction (indicated by arrow R in the figure).

Also, understand the positional relationship of -1-
16 - For the sake of clarity, Figs. 5(a) to 5(e) show the expanded coils 1 to 3 of Fig. 4, and the rotor 3 of Fig. 4.
An expanded view of the main magnet 38 and marker 41 of No. 9 is also shown. In FIG. 5, the same parts as in FIG. 4 are given the same reference numerals.

There are three sets of coils shown in FIG. 5(a), 1 to 14. It is represented by ITI~I[4, I[II~■4. Also, 14. Tit,, lI[4 is,
Each is grounded. Assume that the rotor 39 in FIG. 4 is initially in the position shown in FIG. 5(b) with respect to the coils I to (3) of 31''I.

That is, the positional relationship between FIG. 4 and FIG. 5(b) corresponds accurately, and the positions of A and B in each figure also correspond.

Now, assume that the position of the sensor 25 is B. The main magnetic pole 38 is the fifth
As shown in Figures (b) to (e), the N and S poles are arranged alternately in 4
Each pole is magnetized with 8 poles arranged at equal angular intervals.

Further, the marker 41 magnetized on the rotating body 40 is also the fifth marker.
As shown in Figures (b) to (e), the main magnetic pole 38 is magnetized.
and video "The heads 45a and 45b rotate together. Then, when the rotor 39 rotates in the forward direction, as shown in FIG.
'c) - + Figure 5 <d> - + Figure 5 (e) and shift fIl
′? I-ru.

Here, the following conditions are required for the magnetization pattern of the marker 41 magnetized on the circumference of the rotating body 40.

■Sequentially aI'+, a2, . . . the magnetic pole change points that change from N pole to S pole toward the reverse rotation direction of the motor.

When expressed as a13, the magnetic poles from the magnetic pole change point a2 to 813 exist at equal intervals.

■The maximum of the detected waveform of the magnetic flux density of the N pole adjacent to the magnetic pole change point a1 (1η (the peak value at which the output waveform changes from increasing to decreasing) is the maximum value of the detected waveform of the magnetic flux density of the other N pole of marker 41 The minimum value of the detection waveform of the magnetic flux density of the S pole that is smaller than and adjacent to the magnetic pole change point a1 (the peak value at which the output waveform changes from decreasing to increasing) is the detected magnetic flux density of the other S pole of the marker 41. The minimum value of the waveform J2 is too large.

In other words, the output (differential amplifier 26
In waveform A, which is the output of
The maximum value of the detected waveform for the magnetic flux density of the north pole adjacent to is smaller than the maximum value of the detected waveform for the magnetic flux density of other north poles, and similarly, the detected waveform for the magnetic flux density of the south pole of the marker 41 Behind the minimum value, magnetic pole change point a1
The minimum value of the detected waveform for the magnetic flux density of the S pole adjacent to is larger than the minimum value of the detected waveform for the magnetic flux density of the other S poles.

Note that the above two conditions (■) and (2) are required as the magnetization pattern of the marker 41, but among these conditions, (■) is especially required.
The conditions will be described in detail later. Further, the number of magnetic pole changing points may be three or more (a+ to a3).

Next, consider the conditions for rotating the driven motor in the forward direction.

Now, in the state shown in FIG. 4 or FIG. 5(b), if a current is passed through the coil in the direction from I1 to I4, then
] Since the coil pieces 1 and 13 face the north pole of the main magnetic pole 38, and the coil pieces 2 and 14 face the south pole of the main magnetic pole 38, by Fleming's left-hand method 111, Coil piece I1. I,! , 13°I4 are each subjected to a force in the opposite rotational direction.

However, since the coil is fixed, the main pole 38 receives rotational force and rotates in the forward rotation direction. And rotation A3
9 exceeds the position shown in FIG. 5(C), the coil pieces 11 to 1
4 will all face the south pole, and no force will be generated. Therefore, in order to obtain continuous rotation
At position C), the current can be switched to the coil ■ in the direction from ■1 to ■4 according to the flow rate. Then, the coil KIT
+, lI3 faces the north pole, ]il piece T[2, TI4 faces the S
Since it faces the pole, the main pole 38 obtains a rotational force in the same way as described above. Similarly, when the rotor 39 reaches the position shown in FIG. 5(d), the current may be switched to the coil (2). Similarly, when the rotor 39 is in the position shown in FIG. 5(e), the current may be switched to the coil. The same applies hereafter.

That is, the position of the main magnetic pole 38 with respect to the coils ■ to ■ is as follows:
At the positions shown in Figure 5 (b), (c), (d), and (e),
Coil I, ]il l'[, ]il ■, coil ■, respectively.
, . . . The current may be changed in the order of .

To do this, in the state shown in Fig. 5(b), sensor 4 no. 25 detects the magnetic pole change point a13, and current is passed through coil ■.
In the state shown in FIG. 5(C), the sensor 25 detects the magnetic pole change point a2, and current is passed through the coil ■; in the state shown in FIG. 5(d), the sensor 25 detects the magnetic pole change point a3, and the coil The sensor 25 detects the ftl change point a4 in the state shown in FIG. 5(e), and the current is applied to the coil (2). The same applies below.

Further, the main magnetic pole 38 of the rotor 39 is magnetized into 8 poles with N poles and S poles alternately spaced at equal intervals, and there are also 12 magnetic pole changing points 82 to a13 of the marker 41 at equal intervals, so that Once rotated in the correct direction, the sensor 25 continuously detects the magnetic pole change points a2 to a13, and the drive currents of the coils 1 to 2 can be switched to rotate the coils.

In any case, the current switching point needs to be the 11-pole change point a2-813 of the marker 41.

By the way, since the magnetic pole change points 82 to a13 are located at equal intervals, the rotational speed information can also be used. That is, the above-mentioned FG multiplied signal. Furthermore, as rotational phase information, it is necessary to detect the position at one location during one rotation. In the above-described drying and dusk driving device according to the embodiment of the present invention, the magnetic pole change point a1 or a2 (or a1' in FIG. 5(b)) of the marker 41 is used.

From the above, in the motor drive device according to the embodiment of the present invention, the output of the sensor 25 is input, and the signal corresponding to al among the magnetic pole change points a1 to a13 of the marker 41 or a
A circuit that extracts only the signal corresponding to 2 (or the signal corresponding to a, /) [PG signal] and 82 ” a 13
A circuit is required to extract only the signal [FG signal] that corresponds to the FG signal. This is an FG multiplier signal and PG signal generation circuit, which will be described later.

Next, each component of the motor drive device of the present invention shown in FIG. 1 will be explained.

First, the sensor part 22 will be explained. When the rotor 39 is rotating in the forward rotation direction, the sensor (Hall element) 25 detects and outputs the magnetic flux density corresponding to the magnetic pole of the marker 41. The output of the sensor section 22 (differential amplifier output) when the rotor 39 is rotating in the forward rotation direction with constant speed polishing is the output waveform A in the timing chart of FIG.
Indicated by That is, according to the conditions of the magnetization pattern of the marker 41 described above, in this waveform A, the maximum peak value (local maximum value) of the detected waveform corresponding to the magnetic flux density of the N pole bordering on the magnetic pole change point a1 of the marker 41 is It is smaller than the maximum peak value (local maximum value) of the detected waveform corresponding to the magnetic flux density of the other north pole of the marker 41, and the detected waveform corresponding to the magnetic flux density of the south pole bordering on the magnetic pole change point a1 of the marker 41. Minimum wave height value (minimum value)
is output so as to be smaller than the minimum peak value (minimum value) of the detected waveform corresponding to the magnetic flux density of the S pole of the marker 41.

FIG. 7 shows a block diagram of the FG double signal and PG signal generation circuit. Further, FIG. 8 shows a specific circuit example of the FG multiplied signal G signal generation circuit shown in FIG. In Figure 1 23-7 and Figure 8, the same components as in the previous figures are designated by the same reference numerals 61.

The output of the sensing section 22 (differential amplifier output) is sent to the comparator (
level comparator) 27A, 27B, 27
G respectively. The purpose of the comparator 27A is to detect all magnetic pole change points, and to achieve this purpose, the comparator 27A is set to the voltage Vs as a comparison input level.

That is, in the timing plate of FIG.
1 magnetic pole change a12. al3.8 I.

a2. Exactly matches a3...

Also, the comparator 273 compares the portion (marker 4) of the maximum value of the waveform A in FIG.
The comparison input level of the comparator 27B is set to the voltage Vc so as to detect only the N pole portion adjacent to the magnetic pole change point a1 of the comparator 27B.
It is set as follows. If the input voltage level of the comparator 27B is greater than the voltage VC, the output will be at the "H level", and if it is smaller than the voltage VC, the output will be at the "L level", so the output waveform of the comparator 273 will change at the timing shown in FIG. In the chart, the waveform will look like C.

The comparator 27C also outputs a portion of the minimum value of the waveform A shown in FIG.
The comparison input level of the comparator 27G is set to the voltage Vo so as to detect only the S pole portion adjacent to the magnetic pole change point a1 of the comparator 27G.
It is set as follows. If the input level of the comparator 27C is larger than the voltage VD, the output becomes "L level", and if it is smaller, the output becomes "H level", so the output waveform is as shown in the waveform in the timing chart of FIG. It becomes like ri.

Next, the output waveforms B, C, and D of these comparators 27A, 27B, and 27G are supplied to a digital signal processing circuit 28. Various methods can be considered for the circuit configuration of this digital signal processing circuit 28, but in short, using the waveform C and the waveform curve shown in FIG. 41 magnetic pole change point a2
A circuit that extracts only the pulse at the timing corresponding to ~a13 and the magnetic pole change point a1 or a, J of the marker 41
There are two circuits: a circuit that extracts only pulses at timings corresponding to . The latter is used as an FG signal generation circuit, and the latter is used as a PG signal generation circuit.

Here, a specific circuit example of the FG multiplied signal and PG signal generation circuit 23 shown in FIG. 7 shown in FIG. 8 will be explained. Of this circuit, an R-8 flip-flop 46 and an AND gate 4
7 constitutes an FG signal generation circuit. The R-S control flop 46 is set at the rising edge of the S terminal input, and reset at the falling edge of the R terminal input. Therefore, the output waveform of the Q terminal of this R-S control flop 46 becomes the waveform E shown in FIG. 6, and this waveform E and the comparator 27A
By which AND of the output waveform B is taken, the waveform F in FIG. 6 is obtained. And the falling part of this waveform F is
It coincides with the magnetic pole change points 82 to a13 of the marker 41.

Further, a PG signal generation circuit is constituted by the R-S flip-flop 46 and the edge 1 to trigger D flip 70 tube 49 with set/reset terminals such as the inverter 48.

The CkPa child input inverting input of the D flip-flop 49] is input, and the waveform G('R-S
The ci@child output of the flip-flop 46 is input.

S terminal manual input (set terminal input) is fixed at "L level". When the waveform E is at the "L level", that is, when the D flip-flop 49 has not been reset and is at the D@child large input P1 level, the waveform T1 input to the Ck terminal rises. is only at the timing of detecting the magnetic pole change point a1 of the marker 41. Also, when the R terminal input becomes "H level", it is reset and the Q terminal output becomes "1".
Therefore, the output of the D flip 70 knob 49 (Q terminal output) becomes the waveform (2) shown in FIG. 6, and rotational phase information (PG multiplied signal) is obtained at the rising edge of this waveform (2).

As described above, once the rotor 39 rotates in the correct direction, the sensor 25 continuously detects the magnetic pole change points a2 to a13 of the marker 41, and the drive current can be switched and rotated.

Further, the digital signal processing circuit 28 shown in FIG. 7, which constitutes the FG multiplied signal and PG signal generation circuit 23, is not limited to the configuration of the embodiment shown in FIG. 8, but may be a circuit shown below.

Therefore, first, another embodiment regarding the FG signal generation circuit will be described.

In place of the R-S flip-flop 46 in FIG.
D of edge trigger with set/reset terminal shown in Figure 1
A circuit using flip-flops may also be used.

The circuit shown in FIG. 11 is similar to the circuit shown in FIG.
-S Like the flip-flop 46, this is a circuit that receives the waveform C1 shown in FIG. 6 and creates waveforms E and G.

In this circuit, when the D terminal input is at ``toll level'', the reset terminal R is always at ``toll level'',
Not reset. At this time, at the rising edge of waveform C, the output Q
becomes "H level", and the output Q becomes "1-level" at the timing when the waveform reaches "1-level". Therefore,
Waveforms E and G are obtained at the outputs Q and Q, respectively.

Further, as an example of a circuit that takes waveforms B, D, and E as input and outputs a waveform F (FG times signal), there is a circuit shown in FIG. In this circuit, when the six input I with an OfH pin is at H level, the output Q is set at H level at the rising edge of waveform B.
If waveform B is inverted via an inverter and reset, output Q becomes waveform F.

Further, as an example of a circuit that takes waveforms B and C as input and outputs a waveform F (FG times signal), there is a circuit shown in FIG. In this circuit, if waveform C is set and waveform B is inverted via an inverter and reset, the output Q becomes waveform F.

An example of a circuit that outputs a signal waveform by inputting waveforms B and E is the circuit shown in FIG. 14. In other words, it is a NAND gate circuit.
The FG double signal is obtained at the rising edge of the signal waveform.

Further, as a circuit that inputs waveforms B and G and outputs waveform J in FIG. 6, there is a circuit shown in FIG. 15. , J.
In other words, it is an OR gate circuit. In this case, the speed information (FG multiplied signal is obtained at the falling edge of the J signal waveform.If the circuit for this OR gate 1 is based on the NOR gate circuit shown in FIG. 16, the output will be the waveform J, and the speed information ( FG
It is clear that the doubled signal is obtained at the rising edge of waveform J.

Furthermore, by combining the circuits shown in Figures 14 to 16 above, it is possible to create signal waveforms F, F, J, and J that have speed information (FG times the signal. For example,
By combining the circuit in Fig. 11 and the circuit in Fig. 15,
Even if you draw the circuit shown in the figure, the output of this circuit will have a waveform J
can be obtained.

Further, as a circuit that receives waveforms B and C as input and outputs a signal waveform, there is a circuit shown in FIG.

In this circuit, the D terminal input is ``H level''.
'', and when a rising clock pulse is input to the CkN input, the output Q has a waveform of ``.

Next, another embodiment regarding the PG signal generation circuit will be described.

An example of a circuit that receives waveforms B, G (or waveform F), and E (or waveform C) as input and outputs waveform 1 (PG multiplied signal) shown in FIG. 6 is the circuit shown in FIG. 19. , this circuit uses an edge-triggered D flip-flop with a set/reset terminal.In this circuit, waveform G is input to the D terminal, and at the rising edge of the waveform B inverted by an inverter, the output Q is 1” level” and reset to waveform E or waveform C.
Output Q becomes "II L level". Therefore, waveform I is obtained at output Q.

In addition, as an example of a circuit that outputs a waveform K (PG double signal) shown in FIG. 6 by inputting waveforms B, G (or waveform ">") and waveform E (or waveform C), the circuit shown in FIG. In other words, this circuit uses a flip-flop (edge trigger) for J-.In this circuit, the J terminal input is at the 1 level, and the K terminal input is at the 1 level.
When the level is ``, the rising trigger of the ■ terminal input is input only when the sensor 4) 41 detects the magnetic pole change point a1 of the marker 41. Therefore, at that time, the output Q is ``1''.
After that, the J terminal input becomes ``1- level'', and the K IJMi child input becomes ``1'' level.
Next, when the ■ terminal input rises, the output Q becomes II L
Therefore, the output Q has a waveform K.

In addition, as an example of a circuit that takes waveforms B, G (or waveform "), and waveform F (or waveform C) as input and outputs the waveform L (PG double signal) shown in FIG. 6, the circuit shown in FIG. There is a circuit shown in Fig. 1. That is, this circuit uses a shift register with a reset terminal f=J.

In this circuit, when the D@high input is "HH level" and the R terminal input is "1-level", the output Q2 is "toll level" only when two rising clock pulses are input to the Ck terminal input in succession. becomes. After that, the R terminal input becomes 1
It is reset at the timing when it reaches "level", and output 02
"L level" roars. Therefore, the output Q2 has waveform 1-
is obtained.

Furthermore, for the same reason as above, the above operation can also be achieved using a counter with a reset terminal shown in FIG.

In addition, when waveforms B and D are input, the waveform M shown in FIG.
(An example of a circuit that outputs a PG multiplied signal is the circuit shown in FIG. A D flip-flop is used.In this circuit, if the R-S flip 70 is set by the waveform B and reset by the waveform, the output Q becomes the sixth
This results in a waveform N shown in the figure. Furthermore, the waveform N is input to the D terminal input of the D flip 70 in the next stage. When the waveform N is at the "H level", the timing at which the waveform B rises is only when detecting the magnetic pole change points a and l of the marker 41. At this time, the output Q of the D flip-flop is "]-Level" Also, the input signal to reset 1 to the R terminal is “
At the timing of reaching the H level, the output IQ becomes 11 levels. Note that the changeover switch in FIG. 23 may be switched to either side.

Due to the above operation, the output Q of the D flip-flop becomes a waveform M.

In addition, by inputting waveforms e, o, and D, the waveform 0 shown in FIG.
There is a circuit shown in the figure. That is, this circuit uses a shift register with a reset terminal. In this circuit, the output Q is only when the D terminal input is at 1 level and two rising clock pulses are input to the Ck terminal input.
2 becomes "H level", and when the R terminal input becomes "1" level, it becomes "L level", so the output Q2 becomes a waveform O. For reference, a waveform P shown in FIG. 6 is obtained at the output Q1.

Furthermore, for the same reason as above, the above operation can also be achieved using a counter with a reset terminal shown in FIG.

Further, as an example of a circuit that receives waveforms B and D as input and outputs waveform M, there is a circuit shown in FIG.

That is, this circuit uses a shift register with a reset terminal. In this circuit, only when the D terminal input is "1" level and two rising clock pulses are input to the Ck terminal input, the output Q2 becomes "H level", and the R@child large input it H level" When this happens, the output Q2 becomes "L level". Therefore, the output Q2 has a waveform M.

Further, for the same reason as above, the above operation can be realized by using the counter shown in FIG. 27 instead of the shift register. That is, in this circuit, when the R@ child input is at L level, the output Q2 becomes II H level at the second clock pulse to the Ck terminal input, and
When the R terminal input is at the 1 level, the output Q2 is at the L level, so the output Q2 has a waveform M.

In the circuit shown in FIG. 8, instead of using the comparator 27B, the comparator 27C, and the R-S flip-flop 46 as a circuit for generating waveform E, for example, a Schmidts trigger circuit shown in FIG. 28 may be used. good.

That is, in the Schmitt trigger circuit of FIG.
When the input signal ei is at a low level (before j+) shown in FIG.
In this case, the input terminals A and B of the AND circuit are both at a low level, and the output thereof is also at a low level. Here, when the level of the input signal ei rises, the A side of the AND circuit simultaneously rises, and the B side rises by the voltage divided by the resistors R+, R2, and R3.

Therefore, the A side is the logic circuit's inversion threshold VT (Cape 1.2
If the B side does not reach VT even if V) is reached, the output eo remains at a low level.

However, when the input signal level further increases and the B terminal reaches the threshold value VT (t2), the output eo is inverted to a high level (the input voltage value at this time is VH). Since this output is positively fed back to the B terminal through the resistor R3, the output is instantaneously inverted.

Next, when the input decreases, the AND circuit will invert if even one input becomes low level, so the moment the A terminal falls below the threshold value VT (t4) (input voltage value V+-)
, the output eo switches to a low level. At the same time, positive feedback occurs in resistor R3, and the reversal is instantaneous. Note that the hysteresis width is adjusted by the resistor R1.

Therefore, the VH and VL levels in FIG.
Assuming Vc and Vo in the figure, the output (eo) becomes "H level" when the input level exceeds Vc as shown in Fig. 29, and when the input level is smaller than Vo, the output (eo) becomes "H level". can get.

Further, even when a Schmitt trigger circuit other than the one shown in FIG. 28 is used, the output waveform E can be obtained by setting the level similar to that described above.

In the circuit shown in FIG. 28, R1 is 100Ω, 4.7Ω, and R3 is 1Ω.

Further, instead of the magnetization pattern of the marker 41 shown in FIGS. 5 and 6, a magnetization pattern of the marker 41a shown in FIG. 30 may be used. That is, the magnetization pattern of the marker 41a shown in FIG. 30 is obtained by shifting the magnetic pole change point a1 in the direction of 813 with respect to the magnetization pattern of the marker 41 shown in FIG. The output waveform obtained from the marker 41a at this time is A'.

Furthermore, the output waveforms of the comparators 27A, 27B, and 27C are waveforms B', C', and D', respectively, and the timing relationships among these waveforms are as shown in FIG.
The timing relationship is exactly the same as that of C and D.

Therefore, even with the magnetization pattern of the marker 41a as shown in FIG. 30, there is no problem in the operation of the apparatus of the present invention.

From the above, if the @magnetic pattern of the marker which is the detected part satisfies the above conditions
No matter where the magnetic pole change point a1 in 813 to a2 exists, there is no problem in the operation of the device of the present invention.

Note that, as in the above embodiment, the present invention provides markers 41 and 4.
A magnetization pattern is applied to 1a, and this magnetization pattern is applied to sensor 4.
The marker 41 is not limited to what is detected by the marker 41, for example, two types of substances with different reflectances are detected by the marker
It is also possible to detect the distribution using a sensor (such as a photoreflector) that detects linear reflectance.

Furthermore, regarding the magnetization pattern applied to the marker 41, there is no difference in effect even if the positions of the N and S poles are exchanged for each magnetic pole (N and S poles).

As described above, the embodiments of the present invention provide a PG head for detecting phase information of a rotating drum, a corresponding FG head for detecting speed information of a rotating drum with two detected magnetic poles, and a corresponding corresponding thereto. For example, in the case of an m-phase Hall motor, m Hall elements were required to switch the drive current of the motor, but these functions can be performed using a single marker ( This can be realized with a magnetic pole to be detected) and one sensor.

Therefore, the number of parts is reduced and assembly of the device is facilitated.

(Effects of the Invention) As described above, according to the motor drive device of the present invention, the current flowing through the coils of each phase is controlled by the rotation detection pulse obtained from the sensor section having the - detected section and the corresponding one sensor. Since the number of parts is generated, the number of parts can be reduced compared to the conventional device, and the wiring can be simplified and constructed at low cost, and the productivity can be further improved.

[Brief explanation of drawings]

FIG. 1 is a block system diagram showing the configuration of a motor drive device according to the present invention, FIG. 2 is a block system diagram showing an embodiment of the present invention, and FIGS. A diagram showing an example of the structure, FIG. 5 is a diagram explaining the movement of the magnetic pole of the rotor of the driven motor with respect to the coil, FIG.
A magnetization pattern and a signal waveform diagram for explaining the operation of a block system diagram of an embodiment of the device of the present invention shown in FIGS. 7 and 8,
FIG. 7 is a block diagram showing the FG double signal and PG signal generation circuit, FIG. 8 is a diagram showing a specific circuit example of the FG double signal and PG signal generation circuit in FIG. 7, and FIG. 9 is a diagram showing a conventional motor. A block system diagram showing an example of a drive device, FIG. 10 is a signal waveform diagram for explaining the operation of the conventional device shown in FIG. 9, and FIGS. 11 to 28 are partial variations of the circuit in FIG. 8. A circuit diagram showing,
FIG. 29 is a signal waveform diagram for explaining the operation of the circuit shown in FIG. 28, and FIG. 30 is a diagram showing another embodiment of the magnetization pattern of the marker constituting the apparatus of the present invention and its signal waveform. 21... Marker section, 22... Sensor section, 23...
FG double signal and PG signal generation circuit, 24... Motor drive circuit, 25... Sensor, 26... Differential amplifier, 27
A, 27B, 27C... comparator, 28...
Digital signal processing circuit, 29... Pulse generation circuit, 30... Switch circuit means, 31... Waveform conversion circuit, 32... Driver circuit, 33... Retriggerable monomulti, 34... Changeover switch, 36... Ring counter, 37... Waveform conversion logic circuit, 38... Main magnetic pole, 39... Rotor, 40... Rotating body, 41. 41a... Marker, 42
... Stator, 43... Shaft, 44... Rotating drum, 45a, 45b... Video head, 46... R-S flip-flop, 47... AND
Gate, 48...inverter, 49...D flip-flop. b-. ^^Ha0 1 Φω
Mouth/IQ1- Procedure correction mouth 1. Display of the case 1985 Patent Application No. 56955 2 Name of the invention Motor drive device 3 Person making the amendment Relationship to the case Patent applicant address 3-12 Moriya-cho, Kanayō-ku, Yokohama-shi, Kanagawa Prefecture Voluntary amendment (1) ) Specification, page 7, line 14 and line 15 of “FG
Coil 1G" is corrected by rFG coil 160J. (2) Correct "amplifier 17" on page 7, line 18 and page 14, line 20 to read "r amplifier 17o". (3) ``Converter 18J'' on page 7, line 19, line 20, and page 15, line 1 is corrected to ``converter 18o.'' (4) Same, page 8, line 8, [Motor coil 17]
coil of motor 11]. (5) Same, page 8, box 16 line “18c, J”
Correct with J. (6) In the same document, on page 10, line 13, "now together" is amended to "now together." (7) Correct "sensor part" in the first line of page 24 to "sensor part J". (8) Change "small" to "large" in the 17th line of page 24.
and correct it. (9) “Falling” in the same page, page 21, lines 9 to 10.
is corrected as "rising". (10) Same, page 39, line 20, ``There is no difference in effect. J is corrected as follows.
For example, the output waveform of the @magnetic pattern in which the positions of the N and S poles have been exchanged is
By reversing the polarity by connecting the +" input terminal and the "-" input terminal, an output waveform as shown in FIG. 6 can be obtained. ” (11) Same, page 40, lines 13 to 14, “...
If so, insert the following sentence between "and [-detected part..."]. [The maximum value of the detected waveform of one of the two physical quantities adjacent to the change point a1 is smaller than the maximum value of the detected waveform of the other physical quantity, and the two types of physical quantities adjacent to the change point a1 The minimum value of the detected waveform of the other physical quantity among the physical quantities is larger than the minimum value of the detected waveform of the other physical quantity. Figure 9 (copy)
Correct the instruction code so that it appears that it has not been distributed. that's all

Claims (1)

[Claims] On the circumference of a rotating body provided on the rotor of a motor to be driven, which has m-phase coils (where m is an integer of 2 or more),
The types of physical quantities are provided alternately, and the points at which one of these two types of physical quantities changes from one to the other are sequentially a_1, a_2, ..., a_n (where n is an integer of 3 or more). And among these, the changing points a_2 to a_n
The physical quantities up to are arranged at equal intervals, and the maximum value of the detected waveform of one of the two physical quantities adjacent to the change point a_1 is smaller than the maximum value of the detected waveform of the other physical quantity. , and the minimum value of the detected waveform of the other of the two physical quantities adjacent to the change point a_1 is larger than the minimum value of the detected waveform of the other physical quantity. a sensor section having a sensor for detecting a physical quantity of the detected section; and the detected section whose driving current to be applied to the m-phase coil of the motor to be driven is to be switched in response to a detection signal from the sensor section. a rotation detection signal with a phase related to the physical quantity position of the part and a repetition frequency proportional to the rotational speed of the rotating body, and a phase related to the physical quantity position of the detected part, and
a detection signal generation circuit that outputs a pulse phase detection signal corresponding to the rotational phase of the rotating body; and a detection signal generation circuit that is supplied with the rotation detection signal of the detection signal generation circuit to create a rotating magnetic field for rotating the rotor. A motor drive device comprising a motor drive circuit that generates a desired m-phase drive pulse and outputs it to each of the m-phase coils as a separate drive current.