JP2003169491A - Motor driver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotatably driving motor driver which has low noise and vibration. <P>SOLUTION: A motor drive current control signal generating means 6 controls the total sum of a motor drive current in response to a torque command signal 20, and outputs a PWM control signal for switching an energizing period by a PWM-Duty control means 4'. A phase switching means 3 outputs a PWM control signal in response to a position signal 21, and supplies a current for PWM driving the motor 2 by an output control means 2. An energizing period switching means 25 controls the energizing period of the motor drive current in response to the input of the torque command signal 20. When the motor drive current is large at the time of starting or the like, voltages Vds of output transistors 13 to 18 in switching the energization are low and the slope of the motor drive current cannot be controlled, and a signal having a short energizing period is outputted to eliminate a two-phase on-state to prevent the motor drive current from occurring. When the torque command signal 20 is low, the difference in the voltages Vds of a Sink side and a Source side of the output transistors 13 to 18 is large, the slope of the motor drive current can be controlled, and the signal for prolonging the energizing period is output. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor drive device used for a drive motor of various discs and tape media.

[0002]

2. Description of the Related Art FIG. 3 is a diagram showing a schematic configuration of a motor drive device for driving a conventional three-phase full-wave motor. In FIG. 3, 1 is a motor, 2 is output control means, 3 is phase switching means,
4 is PWM-Duty control means, 6 is motor drive current control signal generation means, 7 is energization position signal generation means, 8 is current detection resistor, 9 is rotor, 10-12 motor windings, 13-
Reference numeral 18 is an output transistor, 13d to 18d are body diodes structurally attached to the MOS transistors which are the output transistors 13 to 18, 19 is a power supply, 20 is a torque command signal, and 21 is a position signal.

The motor 1 comprises a rotor 9 and motor windings 10-1.
2 and. The output control means 2 comprises output transistors 13-18 and body diodes 13d-18d. The terminals of the motor 1 are U, V, W and N.
U, V, and W are connection terminals with the output transistors 13 to 18, and N is a connection terminal at the midpoint of the motor 1.

The operation of the motor drive device constructed as described above will be described below. The position signal 21 normally uses a sensor such as a Hall element and is arranged at a position of 120 degrees with respect to the rotation axis of the motor 1, and detects the rotating magnetic field of the motor 1 and outputs it as a position signal. In some cases, the induced voltage generated in the motor winding is used as the position signal. The energized position signal generating means 7 outputs a signal according to the phase of the position signal. The torque command signal 20 is a signal that is normally output from a microcomputer (hereinafter, referred to as a microcomputer) or the like and that controls a current for controlling the rotation speed of the motor 1 to a predetermined rotation.

The motor drive current control signal generating means 6 receives the torque command signal 20 and the voltage of the current detection resistor 8 as inputs, and outputs a signal for controlling the total motor drive current according to the torque command signal 20. The PWM-Duty control means 4 outputs PW according to the output signal of the motor drive current control signal generation means 6.
Output M control signal. The phase switching means 3 is PWM-Duty
The output signal of the control unit 4 and the output signal of the energization position signal generation unit 7 are input, and a PWM control signal corresponding to the energization position of 120 degrees is output according to the position signal.

The output control means 2 receives the output signal of the phase switching means 3 as an input and supplies a current for PWM driving the motor 1. The output transistors 13 to 18 sequentially switch the energization phase according to the output of the PWM-Duty control means 4. A current flows through the body diodes 13d to 18d when the output transistors 13 to 18 are turned off by PWM driving. With this configuration, the motor 1 is PWM-driven.

The above structure will be described with reference to the timing charts shown in FIGS. 3 and 4A and 4B. First, the operation of each part will be described with reference to the timing chart shown in FIG. As the position signal 21, a signal whose phase is shifted by 120 degrees according to the phase of the rotor is input. Depending on the input phase of the position signal 21, PWM-
The output control means 2 is controlled according to the output pulse of the duty control means 4 in the PWM section.

The output transistors 13-18 are shown in FIG.
As shown in (a), PW is performed in response to the phase of the position signal 21.
M drive. The energization waveform to the motor 1 is 120 degrees energization, and the PWM-Duty control means 4 outputs a control signal corresponding to 120 degrees energization. At this time, the motor windings 10 to 1
2 (see FIG. 3), the induced voltage Vemf (U),
(V) and (W).

Next, FIG. 4B will be described. Figure 4
As in the case of (a), the position signal 21 is input as a signal whose phase is shifted by 120 degrees according to the phase of the rotor 9. The output control means 2 is controlled according to the output pulse of the PWM section of the PWM-Duty control means 4 according to the input phase of the position signal 21. As shown in FIG. 4B, the output transistors 13 to 18 are PWM-driven in response to the phase of the position signal 21. FIG. 4B shows the case of energization at 150 degrees.
At this time, the PWM-Duty control means 4 outputs a control signal corresponding to energization of 150 degrees. This is P in the PWM section
The slope of the motor drive current is adjusted by controlling WM-Duty.

[0010]

However, the above-mentioned conventional structure has various problems as described below. Comparing 120-degree energization and 150-degree energization in the conventional motor drive device described above, when the motor drive current slope is added at the time of switching the energized phase of the motor drive current as in the case of 150-degree energization, the motor torque becomes smaller. It is known that the change in torque depending on the rotor position can be reduced and the noise and vibration of the motor can be reduced. In order to reduce the noise and vibration of the equipment, a drive method in which a slope is added to the motor drive current has been used.

However, if the energization period is lengthened such as 150-degree energization, the two-phase ON state is always generated in the current switching phase. Here, FIG. 5 is an equivalent circuit showing the state of the voltage generated in the winding and the resistance of the motor at the ON timing of the PWM section. As shown in FIG. 5, each terminal voltage is the current flowing in each phase and the motor winding. It is determined by the induced voltage generated in the line, and the induced voltage of the motor matches the phase of the rotor of the motor, and matches the phase of the position signal 21 as shown in FIGS. 4 (a) and 4 (b). Since the induced voltage is determined by the rotation speed and phase of the motor, it is proportional to the rotation speed and determined by the phase of the position signal 21.

The motor winding U-phase output transistor 13 and the motor winding W-phase output transistor 18 are turned on,
From the phase where the motor winding V-phase output transistor 14 is OFF, that is, the state where the sink side and the Source side are ON one by one, the motor winding V-phase output transistor 1
The state in which 4 is turned on is shown in FIGS. 6 (a) and 6 (b).

The drain of the U-phase output transistor 13
The voltage Vds (U) between the sources is equal to the voltage of the power supply 19 Vcc.
Then, it is shown by the following (Equation 1).

[0014]

## EQU1 ## Vds (U) = Vcc-Vbemf (U) -Ru
× Iu-Rw × Iw-Vbemf (W) -Ron (18)
* Iw-Rsense * Iout However, the resistance values of the motor windings 9, 10, 11 (U, V, W phases) are Ru, Rv, Rw, and the currents are Iu, I
As v and Iw, the sum of the currents flowing through the motor is Iout, and the ON resistances of the output transistors 13 to 18 are Ron (13).
~ Ron (18), the resistance value of the current detection resistor is Rsense. As shown in (Equation 1), the voltage Vds (U) is small when the motor drive current is large at the time of starting the motor.

On the other hand, the voltage Vds (V) of the V-phase output transistor 14 is represented by the following (Equation 2).

[0016]

## EQU00002 ## Vds (V) = Vcc-Vbemf (V) -Ru
× Iv-Rw × Iw-Vbemf (W) -Ron (18)
× Iw−Rsense × Iout (voltage 1), voltage Vds (U) in (expression 2), voltage V
FIG. 7 shows a schematic diagram of voltage changes depending on the phase of ds (V).
(A), It shows in FIG.7 (b).

As shown in FIG. 7 (a), when the motor drive current is large, Vds (U), Vds in the current switching phase.
It can be seen that the voltage difference of (V) is large. V-phase Source
The current Iv = 0 is the initial value, and when Vbemf (V) and Vbemf (U) are compared, Iv shown in FIG.
In the phase rising from the Source side of

[0018]

[Formula 3] Vbemf (U)> Vbemf (V) Becomes

When the voltages Vds of the V-phase and U-phase output transistors 13 and 14 are compared under such conditions, the U-phase voltage Vds (U) is small and the V-phase voltage is large when the motor drive current is large. Vds (V) is large

[0020]

## EQU00004 ## Vds (V) >> Vds (U) Becomes

Due to this voltage difference, the output transistor 1
Comparing the rising edges of the currents 3 and 14, the rising edge of the current Iv of the output transistor 14 is steep and large, and the rising edge of the current Iu of the output transistor 13 is small. This state is shown in FIG. The time constant is constant because it is determined by the L value of the motor winding, but the current reaching value is different, so the slope is significantly different. Therefore, as shown in FIG. 6A, the waveform of the motor drive current is not controlled by the PWM-Duty control means 4. That is, due to the distortion of the motor drive current as shown in FIG. 6A, the torque largely changes depending on the phase, which causes the jitter of the motor and the vibration of the motor to rapidly deteriorate.

Therefore, when the motor drive current is large, that is, when the torque command signal 20 is large, current distortion occurs. Jitter and vibration of the motor at this time are larger than those at 120-degree energization. This has been a cause of noise and vibration of the disk device and the like. Noise is unfavorable in terms of the quality of the equipment, and vibration is a problem because it affects other equipment when a plurality of equipment such as a CD-ROM or HDD is built in.

Next, FIG. 7B is a diagram showing a voltage relationship between Vds (U) and Vds (V) when the motor drive current is small. At this time, the potential difference between Vds (V) and Vds (U) is relatively small, and the motor drive current is PWM-Duty.
Since it is controlled by the control means 4, as shown in FIG. 6 (b), the current waveform has few sharp changes.

As described above, in the system in which the motor drive current is sloped, a good current waveform can be obtained when the motor drive current is small (low load, steady rotation, etc.).
When the motor drive current is large (heavy load, startup, etc.), the current waveform changes abruptly.

When the torque command signal 20 is large in the case of 120 degree energization (especially at the time of starting or heavy load)
Although the noise and vibration of the motor can be reduced more than when the motor drive current has a slope, it is difficult to reduce the noise and vibration of the motor when the torque command signal 20 becomes small (especially during steady rotation).

As described above, in terms of jitter and vibration, it is 1 during steady rotation (when current is small; torque command signal 20 is small).
It is better that the motor drive current has a slope as in the case of 50 degree conduction than that without the motor drive current as in the case of 120 degree conduction, at the time of startup or heavy load (when the current is large; the torque command signal 20). Is large, it is better that the motor drive current has no slope as in the case of 120-degree conduction than it does when the motor drive current has a slope as in 150-degree conduction.

The present invention is directed to solving the above-mentioned problems of the prior art, and an object of the present invention is to provide a disk drive with less noise and vibration and a motor drive suitable for rotationally driving a disk or the like. .

[0028]

In order to achieve this object, a motor drive device according to a first aspect of the present invention receives a torque command signal as an input, and responds to the torque command signal to set a motor drive current energization period. Energization period switching means for outputting a signal for switching, a current detection resistor for detecting a motor drive current, and a motor drive current control for generating a motor drive current control signal by inputting a torque command signal and a voltage generated in the current detection resistor. PWM-Duty is controlled by inputting the signal generating means, the energized position signal generating means for generating the energized position signal by inputting the position signal, the output signal of the energized period switching means and the output signal of the motor drive current control signal generating means. PWM-Duty control means for generating a PWM control signal for
Phase-switching means for inputting the output signal of the PWM-Duty control means and the output signal of the energization position signal generating means for switching the PWM control signal to a phase responsive to the position signal, and a motor for driving the motor with the output of the phase-switching means as input An output control means for supplying a current is provided, and in response to a torque command signal, P
It is characterized in that WM-Duty is controlled to switch the energization period of the motor drive current.

According to a second aspect of the present invention, the induced voltage and the torque are input to the motor drive device according to the first aspect by inputting the induced voltage detecting means for detecting the induced voltage of the motor and the output of the induced voltage detecting means and the torque command signal. An energization period switching means for outputting a signal for switching the energization period of the motor drive current in response to the command signal, and controlling the PWM-Duty in response to the torque command signal and the induced voltage to energize the motor drive current. It is characterized by switching.

Further, in claim 3, instead of the energization period switching means in the motor drive device of claim 2, the output of the induced voltage detecting means and the torque command signal are used as inputs to respond to the induced voltage and the torque command signal. And a PWM-responsive to the torque command signal and the induced voltage, the energization period changing means for outputting a signal for changing the energization period of the motor drive current is provided.
It is characterized in that the duty is controlled to respond to the energization period of the motor drive current.

According to the above construction, the PWM-Duty is controlled in response to the torque command signal to switch or change the energization period of the motor drive current, whereby noise and vibration suitable for rotational drive of the disk device or the like are obtained. It is possible to realize a small motor drive device.

[0032]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a schematic structure of a motor drive device for driving a three-phase full-wave motor according to the first embodiment of the present invention. Here, components having substantially the same functions as the components described in FIG. 3 showing the above-mentioned conventional example are designated by the same reference numerals to show them, and the same applies to each of the following drawings.

In FIG. 1, 1 is a motor, 2 is output control means, 3 is phase switching means, 4'is PWM-Duty control means, 6 is motor drive current control signal generating means, 7 is energization position signal generating means, 8 is a current detection resistor, 9 is a rotor, 10
~ 12 motor windings, 13-18 are output transistors,
13d to 18d are body diodes, 19 is a power source, 20
Is a torque command signal, 21 is a position signal, and 25 is an energization period switching means.

The motor 1 includes a rotor 9 and motor windings 10 to 1.
2 and. The output control means 2 comprises output transistors 13-18 and body diodes 13d-18d. Also, assuming that each terminal of the motor 1 is U, V, W, N, these U, V, W are connection terminals with the output transistors 13 to 18, and N is a connection terminal at the middle point of the motor 1.

The operation of the motor drive device constructed as described above will be described below. The position signal 21 normally uses a sensor such as a Hall element and is arranged at positions of 120 degrees with respect to the rotation axis of the motor 1. The position signal 21 detects the rotating magnetic field of the motor 1 and outputs a position signal. Further, the induced voltage generated in the motor winding may be used as the position signal 21. The energized position signal generating means 7 outputs a signal according to the position signal 21. The torque command signal 20 is a signal for current control, which is normally output from a microcomputer or the like and controls the rotation speed of the motor 1 to a predetermined rotation. The energization period switching means 25 receives the torque command signal 20 and controls the energization period of the motor drive current.

When the motor driving current is large such as when the motor 1 is started, the voltage Vds of the output transistors 13 to 18 is small at the time of switching the energization for driving the motor 1, the energization period is 120 degrees when the slope of the motor driving current cannot be controlled. And output the signal to shorten. As a result, the motor drive current is not distorted because there is no 2-phase ON state. When the torque command signal 20 is small, the output transistors 13-18
Since the difference in the voltage Vds between the Sink side and the Source side is large, the slope of the motor drive current can be controlled,
A signal for increasing the energization period to 150 degrees is output.

The motor drive current control signal generating means 6 receives the torque command signal 20 and the voltage of the current detecting resistor 8 as input,
A signal for controlling the total sum of the motor drive currents according to the torque command signal 20 is output. The PWM-Duty control means 4 ′ receives the output signal of the energization period switching means 25 and the output signal of the motor drive current control signal generation means 6, switches the energization period according to the torque command signal 20, and controls the total current. Output a PWM control signal.

The phase switching means 3 receives the output signal of the energization position signal generating means 7 and the output signal of the PWM-Duty control means 4 ', and outputs the PWM control signal in the phase corresponding to the position signal 21. Output to 2. The output control means 2 receives the output signal of the PWM-Duty control means 4 ', and supplies a current for PWM driving the motor 1. The output transistors 13 to 18 sequentially switch the energization phase according to the output of the PWM-Duty control means 4 '. Due to the PWM drive of the body diodes 13d to 18d, a current flows through the body diodes 13d to 18d when the output transistors 13 to 18 are turned off.

Further, the energization period is switched according to the magnitude of the torque command signal described above, and when the torque command signal is large for 120-degree energization in FIG. 4A, when the torque command signal is large for 150-degree energization in FIG. A description will be given first with reference to FIG. 4A using the drawings showing the waveforms at various portions when the signal is small. As the position signal 21, a signal whose phase is shifted by 120 degrees according to the phase of the rotor 9 is input. The output of the PWM-Duty control means 4 ′ is distributed by the phase switching means 3 according to the input phase of the position signal 21. The output control means 2 is controlled according to the output pulse of the phase switching means 3 in the PWM section, and the output transistor 13
As shown in FIG. 4A, PWM signals 18 to 18 are driven in response to the phase of the position signal 21. At this time, when the torque command signal 20 is large, 120-degree energization is selected by the energization switching signal. As a result, even if the torque command signal 20 is large, no distortion occurs when the energized phase is switched, unlike the conventional 150 ° energization.

Next, description will be given with reference to FIG. As in FIG. 4A, as the position signal 21, a signal whose phase is shifted by 120 degrees according to the phase of the rotor 9 is input. The output of the PWM-Duty control means 4 ′ is distributed by the phase switching means 3 according to the input phase of the position signal 21. The output control means 2 is controlled according to the output pulse of the phase switching means 3 in the PWM section, and the output transistors 13 to 18 are PWM-driven in response to the phase of the position signal 21, as shown in FIG. At this time, since the torque command signal 20 is small, the energization period is controlled to be long.

FIG. 4 (b) shows a case where the motor drive current for energizing 150 degrees is small. The voltage Vd at the switching phase of the output transistors 13 to 18 in this energization of 150 degrees
s is sufficient and the motor drive current is controlled according to the output of the PWM-Duty control means 4 ', so that the energized phase is two-phase O.
No distortion occurs in the energization waveform even in the N phase.

With the above configuration, by switching the energization period of 120-degree energization and 150-degree energization according to the magnitude of the torque command signal 20, from when the motor 1 is started or under heavy load to steady rotation. A high-performance motor drive with low noise and vibration can be realized.

Next, FIG. 2 shows a schematic structure of a motor drive device for driving a three-phase full-wave motor according to a second embodiment of the present invention. In FIG. 2, 1 is a motor, 2 is output control means, 3 is phase switching means, and 4'is PWM-Duty.
Control means, 6 is a motor drive current control signal generating means, 7 is an energization position signal generating means, 8 is a current detecting resistor, 9 is a rotor, 10 to 12 motor windings, 13 to 18 are output transistors, and 13d to 18d. Is a body diode, 19 is a power supply, 20 is a torque command signal, 21 is a position signal, 25 'is an energization period switching means, and 26 is an induced voltage detection means.

The motor 1 comprises a rotor 9 and motor windings 10-1.
2 and the output control means 2 is composed of motor output transistors 13-18 and body diodes 13d-18d. Each terminal U, V, W of the motor 1 is a connection terminal with the output transistors 13 to 18, and N is the motor 1
This is the connection terminal at the middle point. The energization period switching means 25 'of the second embodiment switches the energization period for driving the motor 1 by using the torque command signal 20 and the output signal of the induced voltage detecting means 26 as input. The induced voltage detecting means 26 detects the induced voltage generated in the motor windings 10 to 12 of the motor 1.

Here, the relational expression of the induced voltage is as shown in (Equation 5).

[0047]

Vbemf = Ldφ / dt where φ is the magnetic flux and t is the time. It is known that the induced voltage is proportional to the rotation speed of the motor as shown in (Equation 5), and the rotation speed of the motor 1 may be detected and converted into the induced voltage. It can also be detected from each terminal voltage of W and the terminal voltage of N.

In the second embodiment, the position signal 21, the energized position signal generating means 7, the torque command signal 20, and the motor drive current control signal generating means 6 operate as in the first embodiment. As described above, the output transistors 13-1
The relationship of the voltage Vds generated between the drain and the source of No. 8 is shown in FIG. Voltage V of output transistors 13-18
In order to accurately obtain ds and further reduce the distortion of the motor drive current, it is possible to detect the current flowing in the motor 1 and the induced voltage. In the first embodiment, the voltage Vds may be small under the condition that the current is small (torque command signal is small) and the rotation speed is high (induced voltage is large).

In the second embodiment, the induced voltage detecting means 26
By detecting the induced voltage with, the voltage Vds of the output transistors 13 to 18 is detected more accurately. The energization period switching means 25 'switches the energization period by the output of the induced voltage detection means 26 and the torque command signal 20, and the PWM-Duty control means 4 outputs a signal for switching the energization period according to the voltage Vds of the output transistors 13-18. Output to '. The PWM-Duty control means 4'prolongs the energization period to 150 degrees only in the region where the motor drive current can be controlled, and shortens the energization period to 120 degrees in the region where the motor drive current cannot be controlled to avoid current distortion.

The output signal of the PWM-Duty control means 4'is input to the phase switching means 3. The phase switching means 3 receives the output signal of the energization position signal generating means 7 and the output signal of the PWM-Duty control means 4 ′, and distributes the PWM control signal according to the position signal 21. The output control means 2 operates in accordance with the PWM control signal output from the phase switching signal as in the first embodiment, and drives the motor 1 by PWM.

As a result, the slope of the motor drive current can be controlled more accurately than in the first embodiment.
It is possible to realize a high-performance motor drive device with less noise and vibration during startup and heavy load to steady rotation.

Further, as described above, the power supply is 120 degrees and 15
The 0-degree energization may be switched in two steps, or an energization period changing means for linearly changing the energization period according to the torque command signal 20 and the induced voltage detecting means 26 may be provided instead of the energization period switching means 25 '. May be.

In order to integrate the motor drive device in each of the embodiments into an integrated circuit, a well-known semiconductor process is used.
It goes without saying that chip integrated circuit technology can be used. For example, a double diffusion MOS type FET transistor,
One-chip integrated circuit technology that can use bipolar transistors and CMOS transistors, double diffused MOS type FET
There is a one-chip integrated circuit technology that can use transistors and CMOS transistors. In both cases, an integrated circuit is formed by junction separation, and the junction separation portion is used by connecting it to the potential (earth potential) on the negative electrode terminal side of the DC power supply. The specific transistor arrangement within one chip and the formation arrangement of the diffusion layer for junction separation differ depending on the individual integrated circuit design, and therefore detailed description thereof is omitted here. Further, it goes without saying that various modifications can be made without changing the gist of the present invention and are included in the present invention.

[0054]

As described above, according to the present invention,
By switching the energization period of the torque command signal or the motor drive current that responds to the torque command signal and the induced voltage of the motor, high performance with low noise and vibration can be obtained from the time of starting the motor or from heavy load to steady rotation. This has the effect of realizing a motor drive device.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of a motor drive device that drives a three-phase full-wave motor according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a schematic configuration of a motor drive device that drives a three-phase full-wave motor according to a second embodiment of the present invention.

FIG. 3 is a diagram showing a schematic configuration of a motor drive device for driving a conventional three-phase full-wave motor.

FIG. 4 is a diagram showing a timing chart of the operation of each part that drives a three-phase full-wave motor.

FIG. 5 is a diagram showing an equivalent circuit showing a state of a voltage generated in a winding and a resistance of a motor at an ON timing in a PWM section.

FIG. 6: The output transistors of the motor winding U-phase and W-phase are O
A diagram showing a state in which the output transistor of the motor winding V phase is turned on from the state of the output transistor of the V phase of the motor winding N being turned off.

FIG. 7 is a voltage Vds of each output transistor of U phase and V phase.
(U), schematic diagram of voltage change of voltage Vds (V)

FIG. 8 is a diagram showing a comparison of rising edges of a current Iv and a current Iu of an output transistor.

[Explanation of symbols]

1 motor 2 Output control means 3-phase switching means 4,4 'PWM-Duty control means 6 Motor drive current control signal generating means 7 Energized position signal generation means 8 Current detection resistor 9 rotor 10, 11, 12 motor winding 13-18 output transistor 13d-18d body diode 19 power supply 20 Torque command signal 21 Position signal 25, 25 'energization period switching means 26 Induced voltage detection means

Claims (3)

[Claims] 1. An energization period switching means for inputting a torque command signal and outputting a signal for switching the energization period of a motor drive current in response to the torque command signal; a current detection resistor for detecting the motor drive current; Motor drive current control signal generation means for generating a motor drive current control signal by inputting a torque command signal and the voltage generated in the current detection resistor, and energized position signal generation means for generating a energized position signal by inputting a position signal. And a PWM for controlling the PWM-Duty with the output signal of the energization period switching means and the output signal of the motor drive current control signal generating means as inputs.
PWM-Duty control means for generating a control signal, and P
Phase switching means for switching the PWM control signal to a phase in response to the position signal by using the output signal of the WM-Duty control means and the output signal of the energization position signal generating means as input, and the output of the phase switching means as input to the motor. An output control means for supplying a motor drive current, wherein the PWM-Duty is controlled in response to the torque command signal to switch the energization period of the motor drive current. 2. An induced voltage detecting means for detecting an induced voltage of a motor, and an energization period of a motor drive current in response to the induced voltage and the torque instruction signal with the output of the induced voltage detecting means and the torque instruction signal as inputs. An energization period switching means for outputting a signal for switching the motor drive current, a current detection resistor for detecting the motor drive current, and a torque command signal and a voltage generated in the current detection resistor are input to generate a motor drive current control signal. Motor drive current control signal generation means, energization position signal generation means for generating energization position signals by inputting position signals, output signal of the energization period switching means and output signal of the motor drive current control signal generation means , PWM-Duty control means for generating a PWM control signal for controlling PWM-Duty, an output signal of the PWM-Duty control means, and the energization Phase switching means for inputting the output signal of the position signal generating means to switch the PWM control signal to a phase in response to the position signal, and output control means for supplying the motor drive current to the motor by receiving the output signal of the phase switching means as input. And PWM in response to the torque command signal and the induced voltage.
A motor drive device characterized by controlling the duty and switching the energization period of the motor drive current. 3. An induced voltage detecting means for detecting an induced voltage of a motor, and an energization period of a motor drive current in response to the induced voltage and the torque instruction signal with an output of the induced voltage detecting means and a torque instruction signal as inputs. A control signal for the motor drive current is generated by inputting an energization period changing means for outputting a signal for changing the motor drive current, a current detection resistor for detecting the motor drive current, and the torque command signal and the voltage generated in the current detection resistor. A motor drive current control signal generating means, an energization position signal generating means for generating an energization position signal by inputting a position signal, an output signal of the energization period changing means and an output signal of the motor drive current control signal generating means. PWM-Duty control means for generating a PWM control signal for controlling PWM-Duty as an input, an output signal of the PWM-Duty control means, and the energization Phase switching means for inputting the output signal of the position signal generating means to switch the PWM control signal to a phase in response to the position signal, and output control means for supplying the motor drive current to the motor by receiving the output signal of the phase switching means as input. And PWM in response to the torque command signal and the induced voltage.
A motor drive device characterized in that the duty is controlled to respond to the energization period of the motor drive current.