JPH01164289A - One-phase semiconductor motor - Google Patents

Abstract

PURPOSE:To facilitate starting, by using the output of a magnetic/electric converting element and the induced output of coils, and by setting electrical conduction by 180 degrees at the initiation of the electrical conduction. CONSTITUTION:In the armature magnetic-core 4 of laminated silicon-steel sheets, armature coils 5a-5d are fitted on salient poles 4a-4d, and on the central section of the magnetic core 4, a void slot is formed and a metallic cylinder 2 is fitted, and with the cylinder 2, the core 4 is fixed to a main unit to compose a fixed armature. At the internal section of the cylinder, the external ring of a ball bearing 3 is fitted, and a rotary shaft l is rotatably supported. At one end of the rotary shaft 1, the bottom surface central-section of a mild steel cup 13 is fixed, and inside the cup 13, a ring-formed magnet rotor 6 is fixed. On the rotor 6, N and S magnetic-poles 6a- at the opening angles of 90 degrees are arranged and are rotated confronted with said aalient polea 4a-. The salient poles 4a-, the armature coils 5a-and the Hall element 10 of a magnetic/electric converting element are confronted with respective members, and by the salient, poles 4a-, cogging torque is generated on the rotor 6, and self-starting can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is applied to a drive source for a small-output load, such as an electric fan for cooling an electronic circuit.
-1lJJ machine.

[Conventional technology]

Conventional l-phase semiconductor motors are broadly classified into l-phase motors of the following three technologies.

Seventhly, since the well-known l-phase TI electric motor cannot be started automatically, there is a type of % formula in which the motor is started using cogging torque. This is a technique disclosed in Kotata, No. 33j, which facilitates startup by providing a non-magnetic field section between the N and S magnetic poles of the magnet rotor.

Thirdly, the technique disclosed in U.S. Patent No. 1I, 2//, 263 adds a sub magnetic pole to the main magnetic pole of the magnet rotor, and has substantially the same effect as the technique in Item 2. It is something. In addition, the applicant filed and published Japanese Patent Application No. 1983-212011 (Japanese Patent Application Laid-open No. 62-62-iii≠t
There is a number).

[Problems to be Solved by the Invention] There are three problems in the conventional/phase semiconductor motor described above. First, l-phase semiconductor motors are mainly used as fan motors for cooling electronic equipment. Therefore, when the fan electric car stops due to an accident, it is necessary to output an electric signal for warning. Also, it is necessary that the rotation starts automatically when the cause of the accident is eliminated. Furthermore, it is necessary to prevent burnout of the electric motor during this time.

When the above-mentioned device is installed, if there are many external parts,
There are problems that make it difficult to integrate into an integrated circuit (IC).

Second, the initial and final stages of rotation by electrical degrees,
Especially in the final stage, in addition to the back electromotive force being zero, the magnetic core becomes magnetically saturated.

Excessive armature current flows, causing large Joule loss that does not contribute to torque, resulting in a decrease in efficiency. Thirdly,
In order to prevent this, the above-mentioned U.S. Patent No. 3. Kotata,
There is the technology of No. 33j and No. ≠, 2//, ri No. 63,
and 9 techniques have the disadvantage that the entire magnetic field of the magnet rotor cannot be used advantageously for torque generation, resulting in a decrease in efficiency.

Thirdly, although some means for solving the first problem have already been implemented in the prior art, they require a large number of parts and are not economical.

Also, when converting the control circuit to IC, there are many external components,
There are problems that cause inconvenience.

[Means for solving the problem] In order to prevent excessive joule loss from occurring at the end of energization of the armature coil, the energization is stopped for at least a predetermined section at the end of energization to make startup easier. In order to accomplish this, the object of the present invention is achieved by employing means for suppressing the above-mentioned stopping action only at the time of startup. For this purpose, an AND circuit is used to connect the output of the magnetoelectric transducer (Hall element) and the induction output of the coil, and in the initial stage of energization, the current is energized at 110 degrees (iE electrical angle), making it easier to start up using cogging torque. During rated operation, the set angle (,70
The second problem is solved by reducing the conduction angle by -u degrees).

The second problem is solved by adding a coil to the Hall element, and by using the induced output of this coil, it is possible to obtain a speed detection output proportional to the rotational speed. This output makes it easy to start up as described above, and also makes it possible to take measures when the system stops due to an accident.

Since it is a constant current drive circuit, it is possible to prevent the motor from burning out when it is stopped due to an accident, and when the cause of the accident is removed, it can automatically return to rotation.

Therefore, the first problem is solved.

When integrated into an IC, the only external components are the l-phase armature coil, coil, capacitor, and resistor, so the effect of converting into an integrated circuit is significant. Therefore, the third problem is solved.

[Effect]

At the beginning of energization of the armature coil, the inductance is about 949,679 (in the case of a motor with an output of 1-2 watts) because of the core, so the current rise is relatively slow.
Although the back electromotive force is small, the current value is small and the Joule loss is also small, so there is little effect on efficiency.

However, at the end of energization, the core becomes almost saturated due to the magnetic flux of the magnet rotor, and the inductance becomes only the coil! The inductance decreases to 6 mm/9th place. Therefore, at the end of energization when the field magnetic field is small or zero, a significantly large armature current flows, and since this does not contribute to torque, it becomes the main cause of deterioration of efficiency. In the case of a coreless electric motor, the deterioration in efficiency is less than in the case described above, but there is no change in the fact that there is deterioration.

In order to eliminate this inconvenience, two position sensing elements are used to cut off the energization at the final stage of energization, thereby improving efficiency compared to the known motor of this type. A coil that becomes a position detection element when integrated into an IC can be made small and inexpensive as a chip component, so it can be used as an external component of the IC.

The coil has the following functions in addition to its function as a one-position detection element. The induced output of the coil provides an output proportional to the rotational speed. Using this output, it is possible to energize an armature coil with an electrical angle of iro degrees up to a set speed to ensure startup, and then cut off the final stage of energization to obtain a highly efficient motor. can.

Since a constant current circuit is used, the same circuit can be used even if the power supply voltage is changed.

Therefore, the same IC can be used when converting into an integrated circuit.

Furthermore, by combining the above-mentioned circuit with a rotational speed detection circuit using a coil, it is possible to obtain an apparatus for operating the notification device when an overload is stopped and for automatically returning when the overload is removed.

The drive circuit can be made into one IC, resulting in a configuration with fewer external components.

〔Example〕

Next, one embodiment of the present invention will be explained in detail with reference to an embodiment shown in the drawings. Since the same symbols in the drawings are the same members, the explanation thereof will be omitted.

FIG. 1 is a front view showing the overall structure of an electric motor with a magnetic core.

In FIG. 1, the symbol G is an armature core made by layering silicon copper plates. ≠ Due to the configuration of the ball, the salient poles are shown as symbols 弘a, 弘す, 44c, and GD, and their widths are made slightly less than 90 degrees and are spaced apart by 90 degrees. - Each salient pole has an armature coil ja, j'b, jc.

jd is installed. The central part of the magnetic core≠ is a hole,
A metal cylinder λ is fitted, and the magnetic core is fixed to the main body (not shown) by this cylinder λ, thereby forming a fixed armature.

The outer ring of the pole bearing 3 is fitted inside the cylindrical cylinder, and the inner ring rotatably supports a single rotation shaft.

A bottom center portion of a mild steel cup J/3 press-worked into a cup shape is fixed to the l end of the rotating shaft l.

An annular magnet rotation +6 is fixed inside the cup 13, and the magnet rotation +6 has an opening angle of 90 degrees.
, S magnetic poles 6a, 4b, .

≠ b, . . . and rotates together with the rotation axis l.

The left arrow B of the salient pole≠a indicates the void (o at the largest part,
There is also a gap at point C on the right side of the magnetic pole Ja through the magnetic pole Ja (about r millimeters) (the gap of equal length is H-% of the total gap, and the gap length is 0.j mm).

) is opposed to the magnetic pole 6a.

The above-mentioned voids are similarly provided in the other salient poles u1), ec, and <ta. With this means, cogging torque is generated and self-starting is possible.

Arrow Y is the direction of rotation.

FIG. 2 is a developed view of the electric motor shown in FIG. 1 at 7 degrees (electrical angle). From now on, all angles shall be expressed in electrical angles.

Salient poles ≠a, ≠b, ... and armature coil ja.

tb, . . . and the Hall element 10 serving as a magnetoelectric transducer indicate the facing state between each member and the magnet rotor 6. @ Because salient poles a,≠b, . Cogging torque is generated in the rotor B, and it rotates by a predetermined angle in the direction of arrow Y and then stops, so it can start automatically.

For this reason, the left half of the salient poles 4ta, ≠b, . . . is bent downward.

The salient pole in FIG. 1 also has the same shape. The self-starting means may be other known means.

When the armature coils a, jb, . . . are energized reciprocally every time the magnet rotor 6 rotates by 710 degrees in electrical angle, an output torque is generated and the coils rotate as an l-phase motor. In the case of a fan motor, a plurality of fans are provided outside the rotor 13 shown in FIG.

The general l-phase electric motor described above has the following drawbacks.

The efficiency deteriorates, and when the input is about 1 to λ watts, the efficiency is about 32% to 35%. Compared to this type of three-phase device, which has an efficiency of 60 to 70%, the efficiency is significantly lower.

The device of the present invention eliminates the cause of such efficiency deterioration, and
The efficiency is increased by ts% to 2D% to about 50% to 55%. One curved edge of the armature current, the details of which will be explained next, is shown as curve 3 in the time chart of FIG. This distortion will be explained.

At the beginning of energization of the armature coil, the rise is smooth due to the inductance, and then due to the back electromotive force, the curved line 3 becomes a concave portion in the middle.

At the end of energization, the magnetic core approaches saturation, so the induction constant rapidly approaches zero and the inductance rapidly mixes. According to practice 1, the inductance at the 8th end of the song &1≠3 is 9mm henri, and at the right end it is about 5mm henri. However, this applies to a motor with an input of about /Watt to λW. Therefore, the back electromotive force also decreases rapidly and the armature current increases rapidly. Furthermore, since the magnetic energy proportional to the inductance also decreases rapidly, the released magnetic energy ends up increasing the armature current. Therefore, as shown in the rightmost curve of curve ≠ 3 in Figure 1, when the armature current increases rapidly and rotates by iro degrees, the armature current is cut off, but according to actual measurements, the peak value at this time is: The value is almost the same as the starting current.

In this vicinity, the field magnetic field is small or zero, so there is almost no output torque and the ineffective Joule loss rapidly increases.

The situation is exactly the same for other magnetic poles and salient poles.O If we use an IM machine that rotates at 3000 revolutions per minute, we will get μ number of track errors per /rotation, so at 2000 number of track errors per minute. The current is applied as shown. In extreme terms, this fact can be understood as a DC motor that is started 2000 times per minute, which is the main cause of deterioration in efficiency.

In addition, as shown by the dotted line 3a, there is energization due to the release of accumulated magnetic energy from the armature coil. This energization results in a counter-torque, which is disadvantageous in that it further deteriorates the efficiency.

In order to eliminate the above-mentioned drawbacks, the optimum means is to stop the armature current flow at the point indicated by the dotted line 6 in FIG. That is, it is preferable to cut off the current at the point indicated by the dotted line 6. The optimum width of the current to be cut is generally from 30 degrees to the viscosity level.

A control circuit for eliminating the above-mentioned disadvantages will now be described with reference to FIG.

In FIG. 3, a terminal 30 to which power is supplied from the positive electrode of the DC power source
The output of the Hall element 10 (indicated by the same symbol in FIG. 2), which is leaking current through the constant voltage circuit /l due to a, is amplified by the operational amplifier //a, and the output is amplified by the operational amplifier //a (the time chart shown in FIG. 1). It is indicated by taku35 a, jj b, .

The output of the operational amplifier //1) is the curve 36a+3 in Figure J.
6b, . . . are shown closed.

Song IQ33 a, 3! 'b, . . . and tracks 36a, 36b, - are position detection signals of rectangular wave output.

The Hall element (becomes a 4JBt conversion element) 10 is a second
As shown in the figure, it is provided at the boundary between the N and S magnetic poles when the output torque is zero, that is, when the magnetic pole and the salient pole face each other directly.

In addition, a coil 10a is fixed to the armature side facing the magnet rotation sense. The coil lOa has a J-turn shape and an outer diameter of several millimeters.

The coil surface faces the magnetic poles Aa, 6b, . . . or the N, 8 magnetized portions having the same phase on the magnetic pole end surface.

Since the induction recommended output of the coil 10a is delayed by 90 degrees (hereinafter, all indications are in electrical angle), the Hall element 10
Yo,! 11 (90+114) degrees.

Therefore, the outputs of the operational amplifiers //c and //d in Fig. 3 are
In the time chart of Figure 1, one song is 1J7a137b.
,...and songs! They are indicated as Jzaa, Jzasu, .

The operational amplifiers //a and //d are linear amplifier circuits.

Such an output is obtained from the rectangular wave product circuit shown in FIG. 3, 2a.

/2b, respectively, and are made into rectangular waves, and in FIG. 1, curves 39h, , j9b, ... and curves 1AOa,
They are shown as ub,...

Since the outputs of the operational amplifiers //a and //d are rectified by diodes, the voltage drop across the resistors /9a and /9b is proportional to the rotation speed. The symbol Δ is an integrating capacitor for smoothing.

A voltage proportional to the rotational speed is inputted to one terminal of the operational amplifier /, and a voltage of a reference voltage terminal 2/a is inputted to the tenth terminal.

Therefore, when the rotation speed is lower than the set rotation speed corresponding to the reference voltage, the output of the operational amplifier 21 is not at a high level, and when it becomes higher than the rotation speed, it is converted to a low level.

The curves jqa, 39b, ... and the song in Figure J? tM Sir a.

The signals ll0b, . . . are input to AND circuits /Ja, /Jb via OR circuits /7a, /7b.

Similarly, the output of operational amplifier 2/ is an AND circuit /Ja, /
jb input. At startup, operational amplifier 2/
Since the output of is at high level, the operational amplifier n
When the output of is high level, AND circuit /Ja, /J
The outputs of 'b are curves 33a and 33b in FIG.

...and the songs dJA a , JA b , and so on.

Therefore, the transistor /j of the transistor bridge circuit
a, 15b and transistor /Sc, /! ; Continuity of d is 1
The armature coil G (armature coil!
series or parallel circuits of a, jb, ja, and jd) are also energized synchronously and back and forth.

Armature coil ja, jc and armature coil jb.

If the coils are divided into two sets of coils υ, and each set is energized by a transistor connected in series, the iJL armature is Coils ja, jc and armature coils jb, ta are energized alternately.
It becomes a phase motor. In this specification, the above-described alternation of energization is also referred to as reciprocating energization.

When the rotation speed rises above the set rotation speed, the output of operational amplifier 2/ becomes low level, so 'A/7a is output at the OR time.

The input of the AND circuit via /71) is converted into the output of the rectangular wave shaping circuit /Ja, /2b. At this time, the rotational speed has increased and the visiting output of the coil 10a has become sharp, so the inputs of the AND circuits /Ja and /Jb are
Curve J in the diagram? a, job,... and curve 4Qa.

IAob,... Therefore, the AND circuit/
The output of Ja+/3b is the curve +/a, 4L/b in Figure 5.
, . . . and Hiro 2a, Hiro 2b, . . . .

Therefore, the final stage of energization of the armature coil G is deleted.

Since the point 1fijA in FIG. 5 is deleted, the efficiency is improved as described above.

Although the energization angle of the armature coil may be set to lvO degrees from the initial stage of energization, the starting characteristics due to cogging torque may not be good.

If the current conduction angle is set to 110 degrees only at the time of start-up as in this embodiment, the above-mentioned inconvenience at the time of start-up is eliminated.

The device of the present invention is equipped with a circuit that provides a tIPA current withstand current. Next, I will explain it.

A resistor la in FIG. 3 is connected in series with the energization control circuit for the armature coil G. Terminal 30b is connected to the power supply negative terminal.

Voltage drop across resistor 2 Ja (proportional to armature current)
becomes the operational amplifier -〇- one terminal input via a full-wave luxury circuit (absolute value circuit is used). Ten terminal Ua
The input is a reference voltage for specifying the armature current value.

The output of the operational amplifier 22 includes AND circuits /Ja and /Jb.

When the armature current value exceeds the seventh set value, the output of the operational amplifier n becomes low level, and when it falls below the second set value, which is slightly lower than the first set value, the output of the operational amplifier n becomes high level. Become.

Therefore, an operational amplifier U having hysteresis characteristics is used.

The above-mentioned energization control will be explained with reference to the time chart shown in FIG.

In FIG. 3, when transistors /ja and /j'b are conductive and armature coil G is energized to the right,
When transistors /ja and /jb become non-conducting,
The stored magnetic energy is diode/Aa.

It is discharged via the power supply, resistor Ua, and diode /Ad. If the current is 1tro degree, this discharge current will be:
The dotted line tAja in FIG. 5 indicates that the counter torque causes the efficiency to deteriorate.

In the device of the present invention, the current flow is cut off at the point where the one-dot line lies, so the discharge current becomes a positive torque ξ. Therefore, part of the stored magnetic energy is circulated back to the power source, and the rest becomes positive torque, which has the effect of increasing efficiency.

The situation is exactly the same for the transistors /3c and 15d and the diodes reversely connected to them.

The diodes /Aa, /6b, /6a, /6d are
Transistor /ja, /jb, /jc, /
j is connected in reverse in parallel to d.

The output of the AND circuit /Ja controls the conduction of transistors 15a and 15b, and the output of the AND circuit 13'F) controls the conduction of the transistors /ja and /jd.

In this case, since the transistors /ja and /jb are simultaneously de-energized, the magnetic energy stored in the armature coil 8 is discharged via the diode /6c, the power supply, and the diode /6d. Therefore, since energy is circulated back to the power source, the discharging current disappears more rapidly, which is effective during high-speed rotation.

The situation is exactly the same regarding energization of armature coil G by transistors /3a and 15d.

When the armature coil G starts to be energized by the outputs of the AND circuits /Ja and /Jb, the current is ≠curve 34 in the time chart of Fig. 3 due to the inductance. It rises like a.

Therefore, when the input to one terminal of the operational amplifier n rises and exceeds the reference voltage of the + terminal, the output of the operational amplifier - becomes low level, and the lower input of AND circuits /Ja and /Jb also becomes low level. , both outputs also become low level. Therefore, the transistor /ja.

Since /3b, /ja, /jd becomes non-conductive, the armature current is cut off.

However, the stored magnetic energy in the armature coil is.

It is discharged via diodes /Aa, /Ab, .

Therefore, the curve in figure μ, ? Descend like Ja.

When it drops to the set value (this value is determined by the hysteresis characteristics of the operational amplifier), the output of the operational amplifier returns to the NO level, and the armature coil starts energizing, as shown by curve 3μb in Figure μ. rise to

As the above-mentioned operation is repeated, the armature current curve becomes the curve 3da ++7.7a, 31Ab, etc. in Fig. When the output is at a low level, as described above, the stored magnetic energy of the 'FIL armature coil is circulated back to the power supply, and the energizing current rapidly decreases and the energization is stopped.

The width of arrow 39 in Figure ≠ is the curve t/-/a#I in Figure 5.
A/1),...or the width of the curve≠2a, invades...

The average value of the applied current can be arbitrarily selected by changing the value of the resistor Ua.

Therefore, the following effects are achieved. It is particularly effective to convert the portion surrounded by the dotted line 32 into an IC.

The portion surrounded by the dotted line 32 in FIG. 3 can be configured as an IC. The symbol for the engineering C pin is 7 (7a, $a *
The coil G, resistor 3a, capacitor Δ, and coil lOa are external components.

Hall element IO is housed within the IC.

The above-described reduction in labor yields the following effects.

First, by changing the resistance, 2Ja, the output torque can be changed. In case of IC, resistance jJ
a is an external resistor.

Second, there is the following effect. When a small motor has a diameter of 3 mm or less, the base of the winding of the armature coil is limited to a small size.

The applied voltage is generally ! A voltage in the range of about 2q volts is used. As a fan electric motor.

When used for cooling circuits of electronic equipment, a fan motor is used depending on this power supply voltage.

At this time, when the rated voltage becomes the applied voltage, the armature coil is made by winding a large number of thin wires.

Therefore, it has the drawback of increasing copper loss and deteriorating efficiency.

At this time, if the motor is rated at j volts, the above-mentioned drawbacks will be eliminated. ``When using this motor at 12 volts, change the resistor Ua to adjust the output to the set value. The armature current can be regulated to

Therefore, deterioration of efficiency can be prevented.

Moreover, there is a certain characteristic that can be handled by simply changing the external resistor Ua when the load is different by using the same electric motor.

Furthermore, a case where the circuit shown in FIG. 3 is implemented as an IC will be explained.

When the circuit shown in FIG. 3 is made into an EO system by a well-known means, it becomes small and flat and can be housed in the outer casing of a small electric motor, thereby providing an effective technical means.

Dotted line 3: The inside of L is converted into an IC. The Hall element 10 is preferably made of silicon, which is the base of the material C. It may be based on gallium arsenide.

The Hall element 10 made in a part of the workpiece 032 is opposite to the magnetic pole of the magnet rotor 6 (shown in No. 1).For example, as shown by the dotted line 32 in FIG. Fix 1 so that it faces the end faces of Aa, Ab,...! Fix C32 to the machine side.

Since the thickness of the workpiece 0 is about 1 mm, it can be fixed in the above-mentioned position without any problem. In addition, in order to install the Hall element 10 so as to face the magnetic pole.

A mark that allows the position of the Hall element io of the part 032 to be determined from the outside is required. For example, it is preferable to provide a recess at the position of the Hall element io. In this case, the main magnetic poles 4a, 6b',
. . . The workpiece C32 is provided oppositely on the end face magnetized surface of the same phase and the same width.

In the case of a coreless flat electric motor, the main @pole can be opposed.

According to the conventional technology, the wiring of the Hall element 10 is Hiromoto. Therefore, the wiring is complicated and accidents are common, but according to this embodiment, such drawbacks are eliminated and the overall size is reduced.

In the device of the present invention, the coil 10a has a conduction angle of iuo.
In addition to increasing efficiency, a speed detection signal is also obtained.

By using the speed detection signal, the current conduction angle at the time of startup is set to /0 degrees, thereby achieving the effect of improving the startup characteristics.

Further, the IC pin 2td, which is the output of the operational amplifier l, is converted to a high-level output signal that causes the rotational speed to be below a set value. Therefore, the buzzer can notify that the motor has stopped due to an accident or overload.

In particular, in the case of a fan motor, the power to the cooled electronic circuit is automatically cut off by the above-mentioned alarm signal of the C pin rating d, and when the cause of the accident is removed, the fan motor automatically returns to rotation. Initially, the electric signal from which the output of the ICC pin (1) is converted to a low level can automatically apply power to the electronic circuit to begin operation.

In the above case, it is necessary to maintain the power supply voltage applied to the fan, but at this time, constant current control is performed by the resistor Q7a, which has the effect of preventing burnout accidents.

〔effect〕

As mentioned above, the first effect is an increase in efficiency, which is about twice that of known electric motors of this type.

The second effect is that the output of the rotational speed detection circuit energizes the armature coil at iro degrees to complete the startup, and after startup, the coil angle is made smaller than lt″O degrees to increase efficiency. ing.

The third effect is that by energizing the motor using a constant current circuit, the same control circuit can be used even if the power supply voltage used changes.

This is a particularly effective means when the system is converted into an engineering C.

The fourth effect is when the control circuit is integrated into an IC.

It can be constructed by housing a magneto-electric conversion element (Hall element), the number of external parts can be reduced, and a motor can be driven with seven ICs.

The jth effect is when used as a fan motor, etc.
When the machine stops due to an accident, the armature current is maintained at a predetermined value to prevent burnout, and at the same time an alarm signal is output, allowing necessary measures to be taken.

When the accident is eliminated, the alarm signal is automatically eliminated and the motor rotation is restored.

Sixth, armature current due to bipolar circuit and seven-nolar circuit! The present invention can be applied to both IJ control circuits.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the device of the present invention, Fig. 2 is a developed view of the magnet rotor and armature, and Fig. 3 is a energization control circuit diagram of the armature coil used in the device of the present invention. The figure is a time chart showing the control of the armature current curve.
Time charts of the position detection signal and armature current curve are shown respectively. /...Rotating shaft, 2...Cylinder, 3...Bearing, ≠, ≠a, Hirosu,...jd...Magnetic core and salient pole,
Yoa. jl), -, jd, G...armature coil, 4a4
a. ..., 4d...Magnet rotor, lO...Hall element, /(lla...Coil, 13...Soft copper kazo, 32...Work 0.7 items...Constant voltage circuit, 30a
,,? (7b...DC power supply positive and negative terminals, //a, /
/b, //c, //ll, 2/, W... - operational amplifier, /,? a, /jb-and circuit, /! a, /
Zb...Square wave shaping circuit, /ja, /jb, 1
5a, /jd. ...transistor, J...1 current circuit, 2/a
, JJa...Reference voltage terminal, 24'a, Evaluation,...
, #Reimori; ;-・-, 30a, 30b, ...I O
Pin, 33a, J3b, -. 3'A a e j Hirob r "' Armature current curve,
Jja...? jb. ..., 36h, JAb, -,,? 7a
, J7b, ..., 3za, 3zasu,
・,3ria,39'b,-,tAOa,
416b, 4L/a, It/b. ..., radiation a, invasion b...position detection signal curve,
Hiro 3. Ki... Armature 1! flow curve.

Claims (2)

[Claims] (1) A fixed armature with an even number of 1-phase armature coils arranged at equal pitches, and field magnetic poles provided inside the rotor, with the magnetic poles and armature coils facing each other. In a one-phase motor with a rotating magnet rotor, the motor is fixed on the fixed armature side facing the magnet rotor at the position where the output is zero when the armature coil and the armature magnetic poles completely oppose each other. one magneto-electric transducer which generates a one-phase position detection signal, and the output of the magneto-electric transducer is amplified, and when facing the N and S poles, the first and second
An electric circuit that obtains a rectangular wave position detection signal, and is fixed to the fixed armature side at a position advanced in phase from the magnetoelectric conversion element,
A coil that faces the magnet rotor and provides an induced output proportional to a magnetic field phase advanced by 40 electrical degrees from the first and second position detection signals, and a coil that rectifies and smoothes the induced output and rotates. Using a rotation speed detection circuit that obtains a DC output proportional to the speed and the induction output of the coil, the output when the coil faces the N and S poles is shaped into a rectangular wave.
an electric circuit for obtaining a position detection signal; a transistor circuit for controlling energization of a one-phase armature coil and a resistor connected in series thereto; a DC power supply for applying a voltage to the transistor circuit and the resistor; an electric circuit that extracts only the superimposed portion of the third position detection signal and the superimposed portions of the second and fourth position detection signals to obtain fifth and sixth position detection signals, respectively; and the above-mentioned rotation speed. A detection signal is output only when the output of the detection circuit is lower than the set value, and the detection signal is used to detect an abnormal state of rotation of the motor.The electric circuit and one single-phase armature coil conduct reciprocating energization. When two armature coils are wound around each other, the alternate energization of the two armature coils in the latter case is called reciprocating energization.
Based on the fifth and sixth position detection signals, the base of the transistor of the transistor circuit described above is controlled, and energization control is performed to reciprocate and energize the armature coil only in response to the high level of the position detection signal. an electrical circuit including a diode which discharges the magnetic energy stored in the armature coil so as to energize the resistor when the transistor of the transistor circuit is turned non-conducting and the armature current is cut off; , when the voltage drop across the resistor is smaller than the first set value, a high level output is obtained, and when it is larger than a second set value, which is slightly larger than the first set value, a low level armature current detection output is obtained. and a control circuit that maintains the conductive state or non-conductive state of the transistor according to the fifth and sixth position detection signals, respectively, in response to the high level and low level state of the armature current detection output. and a self-starting means using cogging torque. (2) In the claim set forth in paragraph (1), until the set rotational speed is reached by the output of the rotational speed detection circuit, the transistors of the transistor circuit are detected by the first and second position detection signals. A one-phase semiconductor motor, characterized in that base control is performed to control energization of an armature coil, and thereafter base control of transistors is performed using fifth and sixth position detection signals.