JPH0475486A - Motor stop device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a motor stopping device that quickly and reliably stops a motor.

BACKGROUND OF THE INVENTION In recent years, recording/reproducing devices using magnetism or light have become increasingly multifunctional, and motors installed in these devices are required to have higher added value. In particular, it is required to stop the motor quickly and reliably, and various methods have been devised in the past.

Conventional technology for such motor stopping devices, for example, sets a predetermined rotation speed, applies maximum deceleration torque to the motor from the motor stop command until that rotation speed, and decelerates the motor until the predetermined rotation speed is reached. It is common to stop the deceleration torque when the number reaches the specified number.

However, such a stopping device has a problem that if an error occurs in detecting the number of rotations at which the decelerating torque is stopped, the stopping device may not be able to stop easily or may reverse itself.

In order to improve the above-mentioned problem, Japanese Patent Application Laid-Open No. 162491/1983 discloses a method in which a deceleration torque is generated according to the rotational speed of the motor to quickly and stably stop the motor without reverse rotation.

FIG. 6 is a diagram showing the configuration and operation of a conventional motor stopping device disclosed in Japanese Patent Application Laid-Open No. 60-162491. After detecting and generating a motor stop command, the switch 1004 is connected to the b side, and the frequency generator 10
By inputting the output of 01 to the motor drive circuit 1006 via the monostable multi-by-break 1007, the deceleration torque is controlled according to the motor rotation speed. As a result, while the motor rotation speed is high, the deceleration torque is large.
The rotational speed rapidly decreases, and when the rotational speed becomes low (when the rotational speed becomes low), the deceleration torque becomes small and the reduction in the rotational speed becomes gradual. This situation is as shown in FIG. 12 (bi).

Problems to be Solved by the Invention However, the conventional motor stopping device described above uses a frequency generator to detect the rotation speed, so when the rotation speed decreases to a certain extent due to deceleration, the output voltage of the frequency generator decreases. However, it becomes difficult to detect the rotation speed. Therefore, there is a limit to how much deceleration torque can be supplied to the motor according to the rotational speed until it comes to a complete stop.The supply of deceleration torque ends before the motor comes to a complete stop, and then the motor gradually decelerates due to its own loss and comes to a complete stop. become. Furthermore, in order to control the deceleration torque according to the rotational speed, a circuit having a frequency-voltage conversion function is required, which complicates the specific configuration.

As described above, conventional motor stopping devices have had various problems.

In view of the above problems, the present invention allows the motor to be completely stopped quickly. A motor stopping device having a simple configuration is provided.

Means for Solving the Problems In order to solve the above problems, the motor stopping device of the present invention provides a motor and a motor driving means that applies forward or reverse torque to the motor and a command signal for driving or stopping the motor. a reversal detection circuit that detects that the driving direction of the motor is reversed; and a reversal detection circuit that detects that the driving direction of the motor is reversed; A torque direction switching circuit switches the direction of torque generated by the motor drive means to a direction in which the motor stops when detected, and a reversal detection circuit detects the reversal of the drive direction, and after a predetermined period of time elapses, the motor and a power supply stop means for stopping the power supply to.

Effect of the present invention With the above-described configuration, after a motor stop command is issued, the torque supplied to the motor is switched from the forward direction to the reverse direction to decelerate the motor, and at the moment when the motor speed reaches zero and starts to reverse, the torque supplied to the motor is switched from the forward direction to the reverse direction. By supplying torque in the same direction for a predetermined period of time, it is possible to prevent the motor from reversing and to quickly and completely stop the motor.

EXAMPLE Hereinafter, a motor stopping device according to a first example of the present invention will be described with reference to the drawings.

FIG. 1 shows a circuit diagram of a motor stopping device according to the present invention. In FIG. 1, an input terminal of a motor 1 is connected to an output terminal of a motor drive means 2. In FIG.

Reference numeral 9 denotes a motor stop command input terminal, which is connected to one input of the comparator 7, and the other input of the comparator 7 is connected to the bias power supply 8.

Here, each of the components 7 to 8 constitutes a discrimination circuit 3,
The output of the comparator 7 constitutes the output of the discrimination circuit 3.

The output of the discrimination circuit 3 is connected to one input of the torque direction switching circuit 5.
The other input is connected to one output of the reverse rotation detection circuit 4. The output of the torque direction switching circuit 5 is connected to one input of the motor drive means 2. The other output of the reverse rotation detection circuit 4 is connected to the input of the power supply stop means 6. The output of the power supply stop means 6 is connected to the other input of the motor drive means 2.

The operation of the motor stopping device configured as above will be described below.

When a motor stop command signal is input to the motor stop command input terminal 9, the torque direction switching circuit 5 operates via the discrimination circuit 3, and the motor drive means 2 generates a drive torque in the opposite direction to the current motor drive direction, that is, deceleration. Operates to supply torque to the motor.

The magnitude of the deceleration torque is maintained at a predetermined magnitude determined by the motor drive means 2.

While the deceleration torque is being generated, the motor continues to decelerate, and after reaching zero speed, the motor finally tries to reverse rotation. When the motor starts to reverse, the reversal detection circuit 4 detects the reversal of the driving direction of the motor, operates the torque direction switching circuit 5, and the motor driving means 2 applies a driving torque in the forward direction that prevents the motor from reversing, that is, acceleration. Operates to supply torque to the motor. Further, the reversal detection circuit 4 that detects the reversal of the motor operates the power supply stop means 6. After a predetermined period of time has elapsed, the power supply stop means 6 operates to zero the acceleration torque supplied to the motor by the motor drive means 2, and the motor is immediately brought to a complete stop.

As described above, according to this embodiment, after a motor stop command is issued, a deceleration torque is supplied to the motor, and when the motor starts to reverse rotation after the speed reaches zero, an acceleration torque is supplied to the motor for a predetermined period of time. It is possible to easily realize a motor stopping device that prevents reverse rotation and can quickly and completely stop the motor.

A motor stopping device according to a second embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 shows a circuit diagram of a motor stopping device according to a second embodiment of the present invention. In FIG. 2, one end of motor drive coils 301 to 303 is common, and the other end of the drive coil 301 is connected to the other end of the drive coil 302 via a capacitor 312. It is connected to the other end of the driving carp box 303. The other end of the drive coil 302 and the other end of the drive coil 303 are connected via a capacitor 313.

The other end of the drive coil 301 is connected to a drive transistor 31.
7 and 320 collectors.

The other end of the drive coil 302 is connected to a drive transistor 31.
6 and 319 collectors.

The other end of the drive coil 303 is connected to a drive transistor 31.
5 and 318 collectors.

The respective emitters of the drive transistors 315 to 317 are connected to the positive feed line, and the drive transistors 318 to 317 are connected to the positive feed line.
Each emitter of 320 is common and grounded via a resistor 321. 322 to 324 are movable element position detectors;
One input terminal of the position detectors 322 to 324 is common and connected to the positive feed line through a resistor 325, and the other input terminal is common and grounded through a resistor 326.

Each output of the position detectors 322 to 324 is connected to an amplifier 327.
~329, respectively, and the amplifiers 327~32
Each of the eight circuits of 9 is an energization switching circuit 330. Power amplifier 331
The signal is transmitted to each base of the driving transistors 315 to 320 through the . A bias power supply 333 is connected to one input of the differential amplifier 334, and is connected to one input of the differential amplifier 334.
The other input of 34 is connected to the emitters of drive transistors 318-320. The output of the differential amplifier 334 is input to a power amplifier 331.

Here, each of the components 315 to 334 constitutes a motor drive means 304.

352 is a motor stop command input terminal, and comparator 337
The other input of the comparator 337 is connected to a second bias power supply 338.

Here, each of the components 337 to 338 is the discrimination circuit 30.
5, and the output of the comparator 337 is connected to the discriminator circuit 3.
05 output.

The output of the discrimination circuit 305 is input to an inversion gate 339, and one output of the inversion gate 339 is input to the energization switching circuit 33 via the torque direction switching circuit 307.
0 and the other output is input to the inverting gate 340.

306 is a reverse rotation detection circuit. The reverse rotation detection circuit 306
One output is transmitted to the energization switching circuit 330 via the torque direction switching circuit 307, and the other output is input to the inversion gate 341 via the inversion gate 342. The output of the inversion gate 341 is input to the inversion gate 340. The first of the inversion gates 340
The output of is input to the inverting gate 341.

Here, the components 340 to 341 constitute the first RS flip 70 tube 309, and the inversion gate 340
The second and third outputs of the first RS flip-flop 309 constitute the first and second outputs of the first RS flip-flop 309.

The first output of the first RS flip-flop 309 is input to an inverting gate 344 via an inverting gate 343 . The second output of the first RS flip-flop 309 is connected to the reset input of the first counter 351.

The output of the reference signal source 350 is transmitted to the first counter 351.
is connected to the input of

Here, the components 350 to 351 are the timer circuit 31
The output of the first counter 351 constitutes the output of the timer circuit 310.

The output of the first counter 351 is input to an inverting gate 345 via an inverting gate 346.

One output of the inverting gate 344 is connected to the inverting gate 34
7 to the base of transistor 348.

A current source 349 is connected to the base of the transistor 348, and its emitter is grounded. The transistor 3
48 is connected to the output of the differential amplifier 334. The other output of the inversion gate 344 is input to the inversion gate 345. The output of the inverting gate 345 is input to the inverting gate 344.

Here, each of the components 344 to 345 is connected to the second RS.
A flip-flop 311 is configured, and the inversion gate 34
One output of 4 is the second RS flip-flop 3.
It has 11 outputs.

Here, each of the components 309 to 311 and 343.
346, 347, 348, 349 are power supply stop means 3
08, and the collector of the transistor 348 constitutes the output of the power supply stop means 308.

The operation of the motor stopping device configured as above will be described below.

First, a state in which the motor is driven steadily will be explained.

When the motor is driving steadily, no motor stop command signal is input to the motor stop command input terminal 352.
At this time, the discrimination circuit 305 operates so that its output is in a High state, and the output of the inverting gate 339 is in a Low state. In addition, each output of the reverse rotation detection circuit 306 is L.
The output of the inverting gate 342 is in a high impedance state.

At this time, the torque direction switching circuit 307 operates to output a torque direction command signal in the same direction as the driving direction of the motor to the motor driving means 304.

On the other hand, the output of the inverting gate 339 is 'L, ow state,
Since the output of the inverting gate 342 is in a high impedance state, the output of the inverting gate 340 is in a high impedance state 2 - the inverting gate 341 is in a low state. That is, the first RS flip-flop 30
The output of 9 is in a high impedance state.

This state will be referred to as a state in which the first RS flip-flop 309 is set.

The first RS flip 70 knob 309 is set,
When the output becomes a High impedance state, the output of the inverting gate 343 becomes a Low state. Further, the counter 351 is reset, and at this time, the output of the counter 351 becomes a Low state. Therefore, the output of inverting gate 346 is in a high impedance state. Reversal gate 3
The output of 43 is in the low state, and the output of the inverting gate 346 is in the high state.
When the high impedance state is reached, the inverting gate 344
The output of is in a high impedance state, the inverting gate 34
The output of No. 5 is in the Low state. That is, the output of the second RS flip-flop 311 is in a high impedance state.

This state will be referred to as a state in which the second RS flip-flop 311 is set.

The second RS flip-flop 311 is set,
When the output becomes a High impedance state, the output of the inverting gate 347 becomes a Low state.

When the output of the inverting gate 347 becomes a Low state, the transistor 348 becomes an OFF state.

When the transistor 348 is in the OFF state, the motor drive means 304 operates so that power can be supplied to the drive coils 301 to 303.

Here, since the collector of the transistor 348 is the output of the power supply stop means 308, when the transistor 348 is in the OFF state, the power supply stop means 308
8 means that the power supply stop command signal is not output.

That is, when a motor stop command signal is not input to the motor stop command input terminal 352, the torque direction switching circuit 307 outputs a torque direction command signal in the same direction as the driving direction, and the power supply stop means 308 outputs a power supply stop command. It operates so that no signal is output. Therefore, the motor drive means 304 supplies power to the drive coils 301 to 303 so that torque is generated in the same direction as the motor drive direction, and as a result, the motor is driven steadily.

Next, the stopping operation of the motor will be explained.

When a motor stop command signal is input to the motor stop command input terminal 352 in the steady driving state of the motor described above, the motor enters a stop operation as described below.

First, a description will be given of what happens immediately after the motor stop command signal is input to the motor stop command input terminal 352.

At this time, the output of the discrimination circuit 305 changes to a Low state, and the output of the inverting gate 339 changes to a High impedance state. Further, each output of the reverse rotation detection circuit 306 maintains a LOW state until the motor starts reverse rotation, and the output of the inversion gate 342 remains in a high impedance state.

At this time, the torque direction switching circuit 307 operates to output a torque direction command signal in the opposite direction to the driving direction of the motor to the motor driving means 304.

On the other hand, the output of the inverting gate 339 changes from the Low state to the H state.
However, the output of the inverting gate 342 remains unchanged in the high impedance state. Therefore, the inversion gates 340, 34
There is no change in the state of the output of the first RS flip-flop, that is, the first RS flip-flop remains set.

Therefore, there is no change in the output state of the power supply stop means 308, and no power supply stop command signal is output.

That is, immediately after the motor stop command signal is input to the motor stop command input terminal 352, the drive coils 301 to 303
The power supply to the motor is maintained, and a torque direction command signal in the opposite direction to the motor drive direction is input to the motor drive means 304.

Therefore, a deceleration torque is generated in the motor.

When deceleration torque is generated in the motor, the motor continues to decelerate, eventually reaching zero speed, and finally begins to reverse rotation.

Next, the operation immediately after starting the reverse rotation will be explained.

When the motor starts to reverse, the reverse rotation detection circuit 306 detects the reverse rotation and changes its outputs from a Low state to a High impedance state.

On the other hand, the output of the inverting gate 339 remains in a high impedance state and remains unchanged.

At this time, the torque direction switching circuit 307 outputs a torque direction command signal to the motor drive means 304 in a direction that prevents the motor from accelerating in the reverse direction, that is, in the same direction as when the motor was driven normally. It works like that.

On the other hand, the output of the inverting gate 339 remains in the High impedance state, but the output of the inverting gate 342 becomes High due to the change in the output of the reversal detection circuit 306.
The impedance state changes to a Low state. Therefore, the output of the inverting gate 341 changes to a High impedance state, and the output of the inverting gate 340 changes to a Low state. That is, the output of the first RS flip-flop 309 becomes a Low state. This state will be referred to as a state in which the first RS flip-flop 309 is reset.

Immediately after the first RS flip-flop 309 is reset, the output of the inverting gate 343 changes from the Low state to the High state.
gh impedance state. Further, the reset state of the tenth counter 351 is released, and the first counter 351 starts counting the reference clock signal output from the reference signal source 350. The first counter 351 keeps counting the reference clock signal a predetermined number of times.
The output of the inverting gate 346 remains in the Low state and does not change, so the output of the inverting gate 346 remains in the High impedance state during this period.

That is, the output of the inverting gate 343 changes from a low state to a high impedance state, but the output of the inverting gate 346 remains in a high impedance state. Therefore, the states of the outputs of the inverting gates 344 and 345 do not change, that is, the second RS flip-flop 311 maintains the set state.

Therefore, there is no change in the output state of the power supply stop means 308, and no power supply stop command signal is output.

That is, immediately after the motor starts reverse rotation, the drive coil 30
The power supply to motors 1 to 303 is maintained, and a torque direction command signal in a direction that prevents acceleration of the motor in the opposite direction is input to motor drive means 304.

Therefore, torque is generated in the motor in a direction that prevents acceleration in the reverse direction.

Next, the operation when a further period of time has elapsed after the motor started reverse rotation will be described.

Immediately after the motor starts to rotate in reverse, torque is generated in the direction that prevents the motor from accelerating in the reverse direction as described above, but at the same time, the first RS flip-flop, which is a component of the power supply stop means 308 309 has been reset.

When the first RS flip-flop is set,
As described above, the output of the inverting gate 343 becomes a High impedance state, and the first counter 351 starts counting the reference clock signal of the reference signal source 350.

When the counter 351 counts the reference clock signal of the reference signal source 350 a predetermined number of times,
It is configured to operate so that its output is in a high impedance state.

Therefore, when time has elapsed since the motor started reverse rotation and the first counter 351 finishes counting the reference clock signal, the output of the first counter 351 becomes High.
h impedance state. Further, in accordance with this, the output of the inverting gate 346 changes from the High impedance state to the Low state.

Therefore, the output of the inverting gate 345 changes from the high impedance state 9 to the inverting gate 344 to the low state. That is, the second RS flip-flop 311
The output becomes a Low state. This state will be referred to as a state in which the second RS flip-flop 311 is reset.

When the second RS flip-flop 311 is reset, the output of the inverting gate 347 becomes a high impedance state, and the transistor 348 is turned on by the constant current source 349. That is, the power supply stop means 30
The output of No. 8 is in a LOW state.

When the output of the power supply stop means 3 C) 8 becomes a Low state, the motor drive means 304 stops the drive coils 301 to 30.
3, the motor will therefore lose torque.

That is, immediately after the motor starts to reverse, a torque is generated that prevents acceleration in the reverse direction, and after a further period of time, the power supply to the drive coils 301 to 303 is stopped.
The motor loses torque, resulting in the motor operating to a complete stop.

As described above, according to this embodiment, when a motor stop command signal is input to the motor stop command input terminal 352, the torque direction switching circuit 307 sends a torque direction command signal to the motor driving means 304 so that a deceleration torque is generated. is input, so that the motor is first decelerated. If the motor continues to decelerate, it will eventually start to reverse, but when the motor starts to reverse, the reverse rotation detection circuit 306 detects this and changes the torque direction command signal output from the torque direction switching circuit 307 to accelerate the rotation in the reverse direction. As a result, it operates to minimize reversal. At the same time, reset the first RS flip 70 knob 309,
The first counter 351 is operated, and the reference signal source 350 starts counting the reference clock signal. When the first counter 351 finishes counting the reference clock signal, the second RS flip-flop 311 is reset, and the power supply stop means 308 issues a power supply stop command signal to stop the power supply to the drive coils 301 to 303. Output to motor drive means 304.

That is, the motor is decelerated until it reverses, and when the motor reverses, a torque is generated that prevents acceleration in the reverse direction until the first counter 351 finishes counting the reference clock signal from the reference signal source 350. By this,
Reverse rotation is kept to a minimum and the motor is quickly and completely stopped.

A motor stopping device according to a third embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 shows a circuit diagram of the motor stopping device of the present invention. In FIG. 3, one output of the power supply stop means 6 is connected to the input of the Tokuma circuit 17, and the output of the Tokuma circuit 17 is connected to the stop detection terminal 20. This is similar to the circuit configuration diagram of the motor stopping device.

The operation of the motor stopping device configured as described above will be described below.

Similar to the motor stop device shown in FIG. 1, when a motor stop command signal is input to the terminal 9, a deceleration torque is supplied to the motor in the direction of stopping the motor, and the motor comes to a complete stop. The power supply stop means 6 not only operates the motor drive means 2 to stop the torque supply, but also operates the time circuit 17. The timing circuit 17 operates to output a signal indicating complete stop of the motor from the stop detection terminal 20 after a predetermined period of time has elapsed.

As described above, according to this embodiment, it is possible not only to stop the motor immediately after a motor stop command is issued, but also to detect that the motor has completely stopped after a predetermined period of time has passed after stopping the motor torque supply. A stopping device for a motor can be easily constructed.

A motor stopping device according to a fourth embodiment of the present invention will be described below with reference to the drawings.

FIG. 4 shows a circuit diagram of the motor stopping device of the present invention. In FIG. 4, the third output of inverting gate 340, which is a component of first RS flip-flop 309, is connected to the input of inverting gate 254 via inverting gate 253. One output of the inverting gate 254 is connected to the reset input of the first counter 351, and the other output is connected to the reset input of the second counter 255. One output of the first counter 351 is connected to the input of the inverting gate 346. the first counter 351
The other output of is connected to the input of the second counter 255. The output of the second counter 255 is connected to the input of an inverting gate 256. The output of the inverting gate 256 is connected to the input of an inverting gate 258. The output of the inverting gate 258 is connected to the input of the inverting gate 257.

One output of the inversion gate 257 is connected to the inversion gate 26
Connected to the 0 input. The other output of the inverting gate 257 is connected to the input of the inverting gate 258. Also, the inversion gate 25'? The input of is the inverting gate 343
connected to the output of

Here, the components 257 to 258 constitute a third RS flip-flop 259, and the output of the inverting gate 257 serves as the output of the third RS flip-flop 259. The output of the inverting gate 260 is connected to the base of a transistor 261. A current source 262 is connected to the base of the transistor 261.

It is connected to the tiger 263.

Here, the components 255 to 261 are connected to the time circuit 212.
The collector of the transistor 261 forms the output of the timer circuit 212.

The rest of the configuration is the same as the motor stopping device shown in FIG. 2, and a description thereof will be omitted.

The operation of the motor stopping device configured as described above will be described below.

Similar to the motor stop device shown in FIG. 2, when a motor stop command signal is input to the motor stop command input terminal 352, the torque direction switching circuit 307 operates via the discrimination circuit 305 and the reversing gate 339. The motor drive means 304 operates to supply the motor with a drive torque in the opposite direction to the current motor drive direction, that is, a deceleration torque.

While the deceleration torque is being generated, the motor continues to decelerate, and after the motor speed reaches zero, the motor finally begins to reverse rotation. At the moment when the motor reverses, the reversal detection circuit 306 operates the torque direction switching circuit 307, and the motor drive means 304 operates to supply the motor with torque that prevents the motor from accelerating in the reverse direction. At the same time, the first RS flip-flop 309 is reset via the inverting gate 342. When the first RS flip-flop 309 is reset, the inverting gate 253°2
54 to the first and second counters 351°255
operation starts. The first counter 351 counts the reference clock signal output from the reference signal source 350,
When the count reaches a predetermined value preset in the power counter 351, one output of the first counter 351 resets the second RS flip-flop 311. Further, the other output of the first counter 351 is outputted every time the count number reaches a predetermined count number.
Outputs a clock signal.

When the second RS flip-flop 311 is reset, the output of the second RS flip-flop 311 turns on the transistor 348 via the inverting gate 347.
In this state, the motor driving means 304 makes the torque supplied to the motor zero. That is, the tenth counter 351 counts the reference clock signal from the reference signal source 350 and applies acceleration torque for the time until the count ends, so that the motor is prevented from reversing and operates to stop quickly. .

On the other hand, the second
The counter 255 counts the clock signal output of the other output of the first counter 351, and when the count reaches a predetermined value preset in the twentieth counter 255, the second counter The output of 255 resets the third RS flip-flop 259 via an inverting gate 256. When the third RS flip-flop 259 is reset, the output of the third RS flip-flop 259 becomes a Low state, turning on the transistor 261 via the inverting gate 260. When the transistor 261 is turned on, the stop detection terminal 263 outputs a signal in a low state indicating a complete stop of the motor.

As described above, according to this embodiment, the second counter 255
and third RS flip-flop 259 and transistor 2
61, the motor stop detection signal is output after the power supply to the drive coils 301 to 303 is stopped in order to completely stop the motor in response to the motor stop command signal. Therefore, it is possible to easily construct a motor stopping device that can detect that the motor has completely stopped.

A fifth embodiment of the present invention will be described below with reference to the drawings.

FIG. 5 is a circuit diagram of a motor stopping device showing a fifth embodiment of the present invention.

5 is the same as FIG. 4 except that a rotation detection circuit 114 is provided. The output of the position detector 322.4 #23° 324 of the component of the motor driver stage 304 is connected to the input of the rotation detection circuit 114. The output of the rotation detection circuit 114 is connected to an inversion gate 151.1.
50 to reset the 20th counter 255.

The rest of the configuration is the same as the motor stopping device shown in FIG. 4, and the explanation will be omitted.

The operation of the motor stopping device configured as described above will be described below.

Similar to the motor stop device shown in FIG. 4, when a motor stop command signal is input to the terminal 352, deceleration torque is supplied to the motor in the direction in which the motor stops, and after reaching a complete stop, A signal indicating a complete stop of the motor is output from the stop detection terminal 263. However, in a motor with a large inertial load, it takes a relatively long time to reach a complete stop after the torque supply is stopped, and after a predetermined period of time has elapsed after the torque supply has stopped, the signal indicating the complete stop of the motor stops. There is a possibility that the motor is still running at the time the signal is output from the detection terminal 263. In order to improve this, a rotation detection circuit 114 is provided, and if the motor is still rotating after the torque supply to the motor is stopped, the rotation detection circuit 114 immediately initializes the time circuit 212. After the motor stops completely due to the operation, a signal indicating the complete stop of the motor is sent to the stop detection terminal 2.
63.

The specific operation is as shown below.

That is, when a stop command is input from the motor stop command input terminal 352, deceleration torque is supplied to the motor in the direction in which the motor stops, and after the torque supply to the motor is stopped, the motor comes to a complete stop. The operations up to the fourth
This is the same as the motor stopping device shown in the figure, and a description of its operation will be omitted.

After the power supply stop means 308 operates the motor drive means 304 to stop supplying torque to the motor, the first counter 35, which is a component of the power supply means 308,
1 is input to the second counter 255 which is a component of the clock circuit 212. The second counter 255 is about to start counting, but at this time,
If the motor is still rotating, the rotation detection circuit 114 operates and resets the second counter 255 through the inversion gates 151 and 150, so the second counter 255 does not perform a counting operation. When the motor completely stops, the rotation detection circuit 114 activates the reversing gate 15.
1,150 to release the reset of the second counter 255 and start counting the clock output from the first counter 351. That is, when the motor completely stops, the second counter 255 counts the clock output from the first counter 351, and the counted number becomes a predetermined value preset in the second counter 255. When the second counter 2 reaches
The output of 55 resets the third flip 70 knob 259. When the third RS flip-flop 259 is reset, the third RS flip-flop 25
The output of 9 is connected to transistor 26 via inverting gate 260.
1 is set to ON state. When the transistor 261 is turned on, the stop detection terminal 263 outputs a signal in a low state indicating a complete stop of the motor.

As described above, according to this embodiment, the rotation detection circuit 114 is provided, and when the rotation detection circuit 114 detects rotation of the motor, the operation of the time circuit 212 is returned to the initial state (reset). By doing so, it is possible to easily realize a motor device that not only promptly stops the motor after receiving a motor stop command, but also can accurately detect that the motor has completely stopped.

Effects of the Invention As described above, the present invention includes a torque direction switching circuit, a reverse rotation detection circuit, and a power supply stop means, and in the motor stopping process, the torque direction switching circuit supplies torque in the opposite direction to the motor, thereby stopping the motor. When the motor decelerates and slightly reverses after reaching zero speed, the torque direction switching circuit switches the torque to the positive direction based on the output of the reverse rotation detection circuit, and after supplying torque for a short time using the power supply stop means, By stopping the supply of torque, the motor is prevented from reversing, allowing the motor to stop quickly. In addition, by providing a timing circuit at the output of the power supply stop means, after stopping the torque supply to the motor, a signal indicating a complete stop of the motor is output after a predetermined time has elapsed, thereby completely stopping the motor. detection becomes possible. In addition, by providing a rotation detection circuit and initializing the time circuit using its output, when the inertial load of the motor is large,
After stopping the torque supply to the motor, if the motor is moving due to inertia, a signal indicating a complete stop of the motor will not be output, and if the motor has truly stopped completely, a signal indicating a complete stop of the motor will be output. It is now possible to output
It becomes possible to detect a complete stop of the motor more accurately.

Due to the above-mentioned effects, it is possible to realize a motor stopping device that can stably and quickly stop the motor and can accurately output the stopped state of the motor.

Ru.

1...Motor, 2 and 304...Motor driving means, 3 and 305...Discrimination circuit,
4 and 306...Reverse rotation detection circuit, 5 and 3
07...Torque direction switching circuit, 6 and 3
08...Power supply stop means, 114...
・Rotation detection circuit, 212... Tokuma circuit, 301
~303... Drive coil.

Name of agent: Patent attorney Shigetaka Awano Haga 1st figure 0o7 Face 1’l(i+)

Claims (7)

[Claims] (1) A motor drive means that generates torque in the forward or reverse direction to the motor, a discrimination circuit that discriminates a command signal for driving or stopping the motor, and a reversal detection detecting that the drive direction of the motor is reversed. When the output of the circuit and the discrimination circuit indicates a stop command state, or when the reversal detection circuit detects a reversal of the driving direction, the direction of the torque generated by the motor driving means is switched to a direction in which the motor stops. Stopping a motor comprising a torque direction switching circuit and a power supply stop means that stops power supply to the motor after a predetermined time has elapsed after the reversal detection circuit detects reversal of the drive direction. Device. (2) In a brushless motor having multiple phase drive coils, the drive coils are sequentially energized to determine the motor drive means that generates torque in the forward or reverse direction and the command signal for driving or stopping the motor. a reversal detection circuit that detects that the driving direction of the motor is reversed, and when the output of the determination circuit means a stop command state, or when the reversal detection circuit detects that the driving direction is reversed. , a torque direction switching circuit that switches the direction of torque generated by the motor drive means to a direction in which the motor stops; and a reversal detection circuit that switches the direction of torque generated by the motor drive means to a direction in which the motor stops, and after a predetermined time has elapsed after the reversal detection circuit detects the reversal of the driving direction. and a power supply stop means for stopping the power supply to the motor. (3) The power supply stop means is a first RS that is reset when a reversal of the motor drive direction is detected in the reversal detection circuit.
It consists of a flip-flop, a timer circuit that starts operating when the first RS flip-flop is reset, and a second RS flip-flop that is reset after a predetermined time set by the timer circuit has elapsed. 3. The motor stopping device according to claim 1, wherein the motor stopping device is configured to stop power supply to the motor when the second RS flip-flop is reset. (4) A motor drive means that generates torque in the forward or reverse direction to the motor, a discrimination circuit that discriminates a command signal for driving or stopping the motor, and a reversal detection detecting that the drive direction of the motor is reversed. When the output of the circuit and the discrimination circuit indicates a stop command state, or when the reversal detection circuit detects a reversal of the driving direction, the direction of the torque generated by the motor driving means is switched to a direction in which the motor stops. After a predetermined period of time has elapsed after the torque direction switching circuit and the reversal detection circuit detect the reversal of the drive direction,
a power supply stop means for stopping the power supply to the motor; and a power supply stop means for stopping the power supply to the motor; and a power supply stop means for stopping the power supply to the motor; A motor stop device consisting of a timer circuit that outputs a motor stop signal. (5) In a brushless motor having multiple phase drive coils, the drive coils are sequentially energized to determine the motor drive means that generates torque in the forward or reverse direction and the command signal for driving or stopping the motor. a reversal detection circuit that detects that the driving direction of the motor is reversed, and when the output of the determination circuit means a stop command state, or when the reversal detection circuit detects that the driving direction is reversed. , a torque direction switching circuit that switches the direction of torque generated by the motor drive means to a direction in which the motor stops; and a reversal detection circuit that switches the direction of torque generated by the motor drive means to a direction in which the motor stops, and after a predetermined time has elapsed after the reversal detection circuit detects the reversal of the driving direction. a power supply stop means for stopping the power supply to the motor; and a stop signal for the motor after a predetermined time has elapsed after the power supply stop means outputs a signal indicating that the power supply to the motor has been stopped. A motor stop device consisting of a timer circuit that outputs . (6) a second counter that starts operating when the power supply stop means stops power supply to the motor;
Claim comprising a third RS flip-flop that is reset by the second counter after a predetermined time elapses, and configured to output a motor stop signal when the third RS flip-flop is reset. The motor stopping device according to item 4 or 5. (7) Stopping the motor according to claim 4 or 5, further comprising a rotation detection circuit for detecting rotation of the motor, and configured to reset the operation of the time circuit when the rotation detection circuit detects rotation of the motor. Device.