JP2001037294A - Motor controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance detection accuracy of the rotational speed and position of a motor. SOLUTION: The controller 25 for a motor 15 comprises an inverter section 24 comprising a plurality of transistors T1-T6 receiving a pulse-like control signal and delivering a rotational driving signal of the motor 15, and a rotation control section 23 for inputting a pulse-like signal for rotating the motor 15 and a pulse-like deceleration signal alternately every period to the inverter section 24 as the pulse-like control signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for controlling a motor for driving a load such as a screen or a shutter.

[0002]

2. Description of the Related Art Prior art PWM (Pulse Width Modulation) in an electric roller device for driving a load such as a screen or a shutter (hereinafter described as an example of a screen).
In the rotation control of the motor in the system, the energization waveform, energization duty, and the like to the motor are determined based on the descent direction of the screen with respect to a predetermined screen load.

[0003]

That is, the electric roller device 1 as shown in FIG. 7A has an inner pipe (not shown) housed in an outer pipe 3 to which one end of a screen 2 is fixed. The outer pipe 3 is smoothly rotated bidirectionally with respect to the inner pipe by a built-in motor, and the screen 2 is moved up and down by this rotation. In this electric roller device 1, when the screen 2 is lowered, it is necessary to stop the screen 2 by applying a brake to the motor at a predetermined lower limit setting position in FIG. 7 (2). Is weak, the stop position of the screen 2 is
As shown in (3), there is a case where it is shifted downward from a predetermined lower limit setting position.

In addition, when the screen is actually wound up or down, the weight of the hanging portion of the screen varies with the rotation of the motor, and the friction coefficient of the sliding portion of the electric roller device changes over time. Therefore, the traveling speed of the screen may deviate from the set speed, or the upper limit position or the lower limit position of the screen may deviate from the initially set position. In particular, when the holding torque with respect to the load of the motor is small with respect to the load of the screen, this problem becomes remarkable.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a motor control device which can improve the control accuracy of the rotational speed and rotational position of the motor with a simple configuration. It is to be.

[0006]

According to a first aspect of the present invention, there is provided an inverter having a plurality of switching means to which a pulse-like control signal is input and for outputting a drive signal for rotating a motor based on the pulse-like control signal. A rotation control unit that alternately outputs a pulse-like energizing signal for rotating the motor and a pulse-like deceleration signal for decelerating the motor to the inverter unit as the pulse-like control signal every cycle. A motor control device characterized by the following.

According to a second aspect of the present invention, in the motor control device according to the first aspect, the rotation control section individually adjusts the duty of the pulsed energization signal and the duty of the pulsed deceleration signal. It is.

[0008]

[Operation] According to the motor control device of the first aspect,
In the pulse-like control signal output to the inverter, the pulse-like energizing signal and the pulse-like deceleration signal are alternated every cycle, that is, the pulse-like deceleration signal is divided between the pulse-like energizing signals. This prevents the load from lowering (rotating) at high speed under its own weight.

According to the motor control device of the second aspect, the duty of the pulsed deceleration signal and the duty of the pulsed energization signal are individually adjusted, so that the descending speed can be adjusted.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 6 show an embodiment of the present invention. FIG. 1 is a block diagram schematically showing an electric configuration of an electric roller device (hereinafter referred to as a roller device) 11 of the present embodiment. FIG. 2 is a circuit diagram showing an example of the electrical configuration of the roller device 11, FIG. 3 is a cross-sectional view showing an example of the configuration of the roller device 11, and FIG. FIG. 5 is a front view showing another operation state of the roller device 11, and FIG. 6 is a waveform diagram for explaining the operation of the roller device 11.

(Overall Configuration of Roller Apparatus 11)
The overall configuration of the roller device 11 of the present embodiment will be briefly described with reference to FIGS. The roller device 11 includes a three-phase motor 15 that smoothly rotates the outer pipe 13 with respect to the inner pipe 14 by a three-phase motor 15 as an example in which the one end of the screen 12 is housed in the outer pipe 13 that is fixed. The screen 12 is moved up and down by this rotation. Inside the inner pipe 14, a gear head 16, a motor 15 and an electromagnetic brake 17 are incorporated.

The motor 15 is fixed to the inner peripheral wall of the inner pipe 14, and the gear head 16 connected to the output shaft of the motor 15 is for deceleration and fixed to the inner peripheral wall of the inner pipe 14. An output shaft 18 protrudes from the gear head 16 to the right in FIG. The output shaft 18 is rotatably supported by a bearing member (not shown) provided on a lid 19 also serving as a right lid of the inner pipe 14.

On the other hand, the electromagnetic brake 17 is provided on the left side of the motor 15 in FIG. 2 as described above, and this electromagnetic brake 17 is also fixed to the inner pipe 14. From the inner pipe 14, a lead wire 20 used for supplying a signal or power to the electromagnetic brake 17 and the motor 15 is drawn out. An outer pipe 13 is rotatably mounted on the outer side of the inner pipe 14 with respect to the inner pipe 14, and the outer pipe 13 is fixed to the output shaft 18.

(Electrical Configuration of Roller Device 11) The electrical configuration of the roller device 11 of the present embodiment will be briefly described below with reference to FIG. The motor 15 of the roller device 11 is provided with a magnetic detection element 21 such as a Hall element, for example, and outputs a rotation speed signal S1. The rotation speed signal S1 is input to the speed detection signal generator 22.
The speed detection signal generation unit 22 generates a pulse-shaped speed detection signal Sv at each timing of a rising edge or a falling edge of each period of the rotation speed signal S1 based on the rotation speed signal S1.

A speed detection signal Sv and an externally input speed command signal Sc for designating the rotation speed of the motor 15
Is input to the rotation speed control unit 23. The speed controller 23 generates a PWM (pulse width modulation) control signal based on the speed detection signal Sv, the position detection signal Sp, and the speed command signal Sc, and outputs the control signal to the inverter 24. The inverter unit 24 includes a switching element such as a power transistor that outputs a drive signal supplied to a coil (not shown) for each phase of the motor 15, and the control signal indicates an on / off state of the switching element. Control. Such a magnetic detecting element 4 and a speed detecting signal generating section 2
2. A control device 25 that controls the rotation of the motor 15 includes the speed control unit 23 and the inverter unit 24.

In this manner, the control device 25 controls the rotation of the motor 15 to a predetermined rotation speed indicated by the speed command signal Sc based on the rotation speed signal S1 from the magnetic detecting element 4 and the speed command signal Sc. Control the speed.

(Example of Circuit of Control Device 25) Hereinafter, an example of a circuit of the control device 25 will be described with reference to FIG. The inverter unit 25 includes transistors T1, T2, T3, T4, T5, and T6 for switching prevention, and diodes D1 and D2 connected in parallel to these transistors, respectively.
D3, D4, D5, and D6. Each transistor T
Collectors 1 to T6 and cathodes of the corresponding diodes D1 to D6 are connected to a power supply line 27 on the positive potential side of the DC power supply 26.

The emitter of the transistor T1 and the anode of the diode D1 are connected to each other, connected to the collector of the transistor T4 and the cathode of the diode D4, respectively.
Of the coil Cu. The emitter of the transistor T2 and the anode of the diode D2 are connected to each other, connected to the collector of the transistor T5 and the cathode of the diode D5, respectively, and further connected to one end of the Y-connected motor 15 coil Cv. The emitter of the transistor T3 and the diode D3
Are connected to each other and the transistor T
6 and the cathode of the diode D6, respectively, and further connected to one end of a coil Cw of the motor 15 which is Y-connected. The emitters of the transistors T4 to T6 and the corresponding diodes D4 to D6
Is connected to the ground potential via the resistor R1 and to the emitter of the transistor T11.
The collector of the transistor T11 is connected to the power supply line 27 via a resistor R2.

The base of the transistor T11 is composed of a phototransistor constituting the photocoupler PC1 and a resistor R
3 to the ground potential. The rotation control unit 23
The two predetermined signal output terminals are respectively connected to delay circuits 28 and 29 each including a plurality of inversion elements, and the output of the delay circuit 28 is connected to a photodiode constituting the photocoupler PC1. That is, the rotation control unit 23
Can control on / off of the transistor T11 via the photocoupler PC1. The output of the delay circuit 29 is connected to a photodiode forming the photocoupler PC2 via a resistor R5. The emitter of the phototransistor constituting the photocoupler PC2 is connected to the ground potential, and the collector is connected to the base of the transistor T12.

The collector of the transistor 12 is connected to the base of a transistor T13 having a collector and an emitter interposed in series with the power supply line 27. That is, the rotation control unit 23 can control on / off of the transistor T <b> 13 via the photocoupler PC <b> 2 and control conduction / cutoff of the power supply line 27.

(First Operation Example of Roller Device 11)
A first operation example of the present embodiment will be described with reference to FIG.

When braking the rotation of the motor 15, in the present embodiment, as shown in FIG. 6A, for each period of the rotation control signal input from the rotation control unit 23 to the inverter unit 24, The descending control (the pulse in the hatched portion in FIG. 6A) and the deceleration control (the pulse in the white portion in FIG. 6A) are alternately performed.

The lowering control (energization control) is performed by the roller device 11.
Is a well-known control method of the motor 15, which is set in consideration of a point that the load of the motor 15 increases as the screen 12 is lowered when the screen 12 is lowered, and is controlled so that the rotational torque of the motor 15 gradually increases. Is done.

The deceleration control is a control method for applying a brake to the rotation of the motor 15.

This is performed as follows.

The pulse voltage V1 output from the rotation control unit 23 to the delay circuit 29 is turned off. In this state, since the photocoupler PC2 does not turn on, the transistor T13 continues to be off, and the power supply line 27
Is cut off, and the DC power supply 26 is not applied to the inverter unit 24. On the other hand, when the pulse voltage V2 is output from the rotation control unit 23 to the delay circuit 28 and the photocoupler PC1 is turned on, the transistor T11 is turned on and the motor 15
The electromotive force due to the windings Cu, Cv, Cw of the diode D1
Through D6 to the resistor R2 to perform power generation braking.

As described above, the roller device 11 of the present embodiment
In the control device 25, the motor 15 can be more strongly decelerated than based only on the lowering control, and the screen 12 driven up and down by the motor 15 fluctuates according to the rotation direction of the motor 15 and the passage of time, In the case where the stop position of the motor 15 is displaced more than designed, for example, because the holding torque for the screen 12 is smaller than that of the screen 12, the motor 15 can be stopped at a suitable stop position. The control accuracy of the rotation speed and the rotation position can be improved.

(Second Operation Example of Roller Device 11)
FIG. 6B shows a second operation example of the present embodiment.

The duty between the descending control period (energization control period) and the deceleration period may be adjusted. this is,
As an example, the selection is appropriately made based on the degree of deviation between the designed lowering speed of the screen 12 and the actual lowering speed.

Specifically, when the descending speed is slow, the PWM duty ratio of the descending logic is increased, and the PWM duty ratio of the brake logic is decreased.

In the case of such an operation example, as described above, the screen 12 driven up and down by the motor 15 is driven.
Is changed depending on the rotation direction of the motor 15 or the passage of time, or the stop position of the motor 15 is displaced from the design as a result of the fact that the holding torque of the motor 15 with respect to the weight of the screen 12 is smaller than the screen 12. In this case, the motor 15 can be stopped at a more suitable stop position, and the control accuracy of the rotation speed and the rotation position of the motor 15 can be further improved (third operation example of the roller device 11). As a third operation example of the embodiment, FIG.
There is one shown in (3).

That is, when the descending speed is high, the PWM duty ratio of the descending logic is increased, and the PWM duty ratio of the brake logic is decreased.

[0034]

As described above, in the motor control device according to the first aspect, the inverter section alternately switches the pulse-like energizing signal and the pulse-like deceleration signal in the pulse-like control signal every cycle. That is, by dividing the pulse-shaped deceleration signal between the pulse-shaped energization signals, the load does not drop (rotate) at high speed due to its own weight.

According to the motor control device of the second aspect, the duty of the pulse-like deceleration signal and the duty of the pulse-like energization signal are individually adjusted, so that the descending speed can be adjusted.

[Brief description of the drawings]

FIG. 1 is a block diagram schematically illustrating an electrical configuration of a roller device 11 according to an embodiment of the present invention.

FIG. 2 is a circuit diagram showing a configuration example of an electrical configuration of a roller device 11;

FIG. 3 is a sectional view showing a schematic configuration of a roller device 11;

FIG. 4 is a front view showing one operation state of the roller device 11;

FIG. 5 is a front view showing another operation state of the roller device 11;

FIG. 6 is a waveform diagram illustrating the operation of the roller device 11.

FIG. 7 is a diagram for explaining a problem of the roller device of the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Roller device 12 Screen 15 Motor 22 Speed detection signal generation part 23 Rotation control part 24 Inverter part 25 Control device

Claims (2)

[Claims] An inverter unit having a plurality of switching means for receiving a pulse control signal and outputting a drive signal for driving a motor based on the pulse control signal; and a pulse energization for rotating the motor. A motor control device comprising: a signal; and a rotation control unit that alternately outputs a pulse-like deceleration signal for decelerating the motor to the inverter unit as the pulse-like control signal every cycle. 2. The motor control device according to claim 1, wherein the rotation control unit individually adjusts the duty of the pulse-like energizing signal and the duty of the pulse-like deceleration signal.