JPH11275882A - Driver of permanent magnet motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a driver which is highly efficient and applicable even at high revolution, without using a microcomputer. SOLUTION: Voltages Vf which is proportional to the number of revolutions is generated by converting a positional signal H detected with a position detector 19u from frequency into voltage, and a DC-linked current 11 detected with a current detector 21 is inputted into a peak holding circuit 22 to generate a voltage Vp proportional to the load torque. A pulse generation circuit 24 generates single-shot pulses P where the width of the pulse deceases with respect to the increase in the added voltage Va of both voltages Vf and Vp, and a current application control circuit 25 gives commutation signals Sup-Swn which have phases delayed by the pulse width, with the phases of position signals Hu, Hv, and Hw as references, to the switching elements 2-7 of an inverter circuit 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive device for a permanent magnet motor having a function of adjusting a commutation phase.

[0002]

2. Description of the Related Art A drive device for a permanent magnet motor rotates a rotor using a position signal output from a position detector mounted on the permanent magnet motor or a position signal obtained based on a terminal voltage of the permanent magnet motor. The position is detected, and a commutation signal is provided to a switching element forming an inverter circuit in accordance with the rotational position. In this configuration, when the permanent magnet motor is rotationally driven, an induced voltage is generated in the stator winding, so that the induced voltage has the same phase as the induced voltage so that a current can flow against the induced voltage. Terminal voltage is applied.

On the other hand, the stator winding of a permanent magnet motor has a time constant determined by resistance and inductance.
The current flowing through the stator winding lags behind the applied voltage by a time corresponding to the time constant. Since the delay time is constant regardless of the rotation speed, the phase delay of the current increases as the rotation speed increases. The phase of the current is also affected by the size of the load (the size of the current).

Since the torque of the permanent magnet motor is generated as a product of the induced voltage and the winding current, if the above-described phase lag occurs in the current, the torque and efficiency are reduced, and in the worst case, May lose synchronism.

To solve such a problem, Japanese Patent Application Laid-Open No.
Japanese Patent Publication No. 11795 discloses a control device for a permanent magnet motor including a correction unit for correcting a position detection signal output from the position detection unit. That is, a microcomputer as a correction means reads a correction phase value corresponding to the rotation speed and the load torque of the permanent magnet motor from a storage unit (map storage unit) according to a predetermined calculation program, and calculates the correction phase value thus read. Is obtained, and the position detection signal is corrected by obtaining a correction time corresponding to.

[0006]

However, the control device disclosed in the above-mentioned publication needs to store correction phase value data in advance, and calculates and obtains a correction time from the correction phase value and a position detection signal. The use of a microcomputer is indispensable for the correction processing. Therefore, when the above-described correction means is applied to a control device for a permanent magnet motor that does not use a microcomputer, it is necessary to newly add a microcomputer, and as a result, the cost of the control device is increased, and the control program is increased. Problems such as a delay in the development period of the entire control device associated with the new development of the control device.

Further, processing using a microcomputer is limited in terms of software processing speed, and is not suitable for a multi-pole motor requiring high-speed processing or a motor used at high-speed rotation.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a drive device for a permanent magnet motor that can be applied even at high efficiency and high speed rotation without using a microcomputer. is there.

[0009]

In order to achieve the above object, a driving device for a permanent magnet motor according to claim 1 is provided.
An inverter circuit having a switching element for sequentially energizing the stator winding of the permanent magnet motor, a DC power supply circuit for supplying power to the inverter circuit, and detecting a position signal corresponding to the rotational position of the rotor of the permanent magnet motor Position detecting means, at least one of a torque detecting means for detecting the torque of the permanent magnet motor and a rotational speed detecting means for detecting the rotational speed of the permanent magnet motor, and the torque detecting means in response to the position signal. Pulse generation means for generating a one-shot pulse having a time width corresponding to one or both of the torque detected by the rotation speed detection means and the rotation speed detected by the rotation speed detection means; Energization that outputs a commutation signal whose phase is delayed by the time width of the one-shot pulse with reference to the phase of the signal And a control means.

With this configuration, the phase correction amount of the commutation signal can be obtained as the time width of the one-shot pulse from the pulse generation means having a hardware configuration based on the torque and the rotation speed of the permanent magnet motor. , The energization control means,
Since the commutation signal is delayed by using the one-shot pulse, the optimal energization phase can be maintained without using a microcomputer, and thus the permanent magnet motor can be operated with high efficiency.

In this case, the energization control means generates a corrected position signal by delaying the position signal detected by the position detecting means by the time width of the one-shot pulse, and generates a commutation signal based on the corrected position signal. It is good to be constituted as follows (claim 2). With such a configuration, the energization control unit can delay the commutation signal by the time width of the one-shot pulse.

Further, the energization control means includes storage means for storing modulation signal data of the commutation signal, and read control for outputting a timing signal for reading the modulation signal data based on the position signal detected by the position detection means. And a timing signal of the read control means is preferably delayed by the time width of the one-shot pulse. With such a configuration, the energization control unit reads out the modulation signal data of the commutation signal from the storage unit based on the timing signal of the read control unit delayed by the time width of the one-shot pulse. Only the commutation signal can be delayed.

In the above case, the torque detecting means
It is preferable that the torque be detected based on the DC link current flowing from the DC power supply circuit to the inverter circuit. With this configuration, the torque can be easily detected at low cost based on the DC link current that increases according to the magnitude of the load torque.

Preferably, the rotational speed detecting means detects the rotational speed based on the frequency of the position signal detected by the position detecting means. With such a configuration, the rotation speed can be detected without providing a rotation speed detector such as a rotary encoder.

Further, the pulse generating means may shorten the time width of the one-shot pulse in accordance with one or both of an increase in the torque detected by the torque detecting means and an increase in the rotational speed detected by the rotational speed detecting means. (Claim 6). With such a configuration, the amount of delay in the phase of the commutation signal can be reduced (advanced phase) with an increase in the torque or the number of rotations, so that the energization phase can be optimally controlled, The magnet motor can be operated with high efficiency.

In addition, when the time width of the one-shot pulse is 0, the position detecting means detects a position signal having a phase such that the input current to the permanent magnet motor during the rated load operation is minimized. (Claim 7).

With this configuration, the delay of the phase of the commutation signal can be reduced as the load increases, and an optimum energization phase can be obtained without delaying the commutation signal during rated load operation.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment A first embodiment of the present invention will be described below with reference to FIGS. Note that all angles in the description use electrical angles.

In FIG. 1, which shows an electric configuration of a drive device of a permanent magnet motor, switching elements 2 to 7 such as transistors and the like are connected between a positive terminal and a negative terminal of a DC power supply 1 which is a DC power supply circuit. The inverter circuit 14 is connected to the reflux diodes 8 to 13 connected to the inverter circuit 14 in a three-phase bridge connection, and the output terminals 15u, 15v, 15w of each phase of the inverter circuit 14 are star-connected to the permanent magnet motor 16. Stator windings 16u, 16v,
16w are respectively connected. This permanent magnet motor 16
Has a rotor 17 on which a permanent magnet is mounted with a certain gap between the stator and the stator. The permanent magnet motor 16 has, for example, a three-phase four-pole motor with a rated rotational speed of 1800.
[Rpm] (60 [Hz]), rated torque 1 [Nm],
Operating speed range 300 [rpm]-1800 [rpm]
(10 [Hz] to 60 [Hz]).

In the frame 18 in which the permanent magnet motor 16 is stored, position detectors 19u and 19 mainly composed of, for example, a Hall IC are provided as position detecting means.
v, 19w are provided. These position detectors 19
u, 19v, and 19w are configured to output position signals Hu, Hv, and Hw having phases different from each other by 120 [deg] according to the rotational position of the rotor 17 at a high level or a low level ( (See FIG. 7).

Rotation speed detection circuit 2 as rotation speed detection means
0 inputs any one of the position signals Hu, Hv, and Hw, for example, the position signal Hu, and performs frequency-voltage conversion (FV conversion) having the conversion characteristics shown in FIG.
A voltage Vf corresponding to the frequency (rotational speed) of the position signal Hu is obtained. That is, in FIG. 2, the horizontal axis represents the frequency (rotation speed) of the position signal Hu, and the vertical axis represents the converted voltage Vf.
When the frequency of the position signal Hu is between 0 [Hz] and 60 [Hz], a voltage Vf proportional to the frequency is obtained. For a frequency exceeding 60 [Hz], the voltage Vf is obtained.
Is constant at 5 [V].

Negative terminal of DC power supply 1 and inverter circuit 14
The current detector 21 as a torque detecting means inserted between the negative terminal of the inverter circuit 14 is mainly composed of, for example, a Hall element, detects an input current (DC link current) IL flowing into the inverter circuit 14, and detects a peak. Hold circuit 22
To be output. In this case, the direction flowing from the negative terminal of the inverter circuit 14 to the negative terminal of the DC power supply 1 is positive.

As shown in FIG. 3, the peak hold circuit 22 which functions as a torque detecting means together with the current detector 21 has a peak value of the DC link current IL flowing in a waveform having a cycle of 60 [deg]. , And outputs the peak hold value as the voltage Vp. In this case, the relationship shown in FIG. 4 is established between the voltage Vp and the load torque of the permanent magnet motor 16. That is, in FIG. 4, the horizontal axis represents the load torque, and the vertical axis represents the voltage Vp which is the peak hold value of the DC link current IL.
m] to 1 [Nm], the voltage Vp and the load torque maintain a proportional relationship, and for a load torque exceeding 1 [Nm], the voltage Vp is constant at 5 [V].

The adder 23 is composed of, for example, an operational amplifier and a resistor. The adder 23 has a voltage Vf proportional to the number of revolutions output from the revolution number detector 20 and a peak hold circuit 22.
Is added to the voltage Vp proportional to the load torque output from the pulse generator circuit 2, and the voltage Va as the addition result is added to the pulse generation circuit 2.
4 is output.

Pulse generating circuit 2 as pulse generating means
Numeral 4 denotes a one-shot multivibrator mainly composed of a CR charging circuit and a comparison circuit (not shown), and the energization control is performed simultaneously with the input of the rising edge or the falling edge of the position signals Hu, Hv, Hw. A one-shot pulse P having a high level is generated for the circuit 25. In this case, the one-shot pulse having the pulse width shown in FIG. 5 with respect to the voltage Va is provided by changing the inversion threshold value of the comparison circuit according to the value of the voltage Va given from the addition circuit 23. P can be generated. That is, in FIG.
The horizontal axis represents the voltage Va from the adding circuit 23, and the vertical axis represents the pulse width of the one-shot pulse P.
It has the characteristic of gradually decreasing with the increase of a.

An energization control circuit 25 as energization control means
Are commutation signals Sup, Svp, Swp, Sun, Sv delayed by the pulse width of the one-shot pulse P from the pulse generation circuit 24 with reference to the phases of the position signals Hu, Hv, Hw.
n and Swn are generated, and the commutation signals Sup to Swn are applied to the bases of the switching elements 2 to 7 of the inverter circuit 14, respectively.

FIG. 6 is a block diagram showing the configuration of the power supply control circuit 25. In this block diagram, the phase delay circuit 26 delays the position signals Hu, Hv, Hw by the pulse width of the one-shot pulse P to generate corrected position signals Hu ′, Hv ′, Hw ′ ( See FIG. 8).

The multiplying circuit 27 calculates the corrected position signal Hu ',
By multiplying Hv 'and Hw' by three, a multiplied signal Q having a width of 60 [deg] is generated (see FIG. 8). Also, PL
Multiplier synchronization pulse generator 2 composed of L circuits
Numeral 8 receives the multiplied signal Q and obtains a multiplied synchronization pulse further multiplied by 256.

Counter 29 as read control means
Is used to up-count a multiplied synchronization pulse obtained by multiplying the width of 60 [deg] by 256, and the count value is used as a timing signal R for instructing a read address of modulation signal data from the ROMs 30 to 32 described later. .

Further, the power supply control circuit 25 controls the sine wave PW
In order to generate the M-modulated commutation signals Sup to Swn,
A memory as storage means in which sine wave modulation signal data is stored for each of U, V, and W phases, for example, ROMs 30 to 3
Two. In these ROMs 30 to 32, amplitude data of sine waves having phases shifted from each other by 120 [deg] are stored in binary data format at consecutive addresses at angular intervals of (60/256) [deg]. The sine wave modulation signal data read from the ROMs 30 to 32 according to the timing signal R is input to D / A converters 33 to 35, respectively, and is converted into modulation signals having analog values.

A comparator 36 provided for each of the U, V, and W phases
To 38 are D / A converters 3 at their inverting input terminals, respectively.
Modulated signals output from 3 to 35 are input, and a triangular wave signal as a carrier signal output from the triangular wave generating circuit 39 is input to its non-inverting input terminal. Comparator 36,
The commutation signals Sup, PWM-modulated from the 37 and 38, respectively.
Svp and Swp are output, and commutation signals Sun, Svn, and Swn, which are inverted signals of the commutation signals Sup, Svp, and Swp, are output from inversion circuits 40, 41, and 42, respectively.

Next, the operation of the present embodiment will be described with reference to FIGS. When the permanent magnet motor 16 rotates, sinusoidal induced voltages Eu, Ev, Ew as shown in FIG. 7 are generated in the stator windings 16u, 16v, 16w. The phases of these induced voltages Eu, Ev, Ew are
7 corresponds to the rotation position of each phase, and the position detector 19 of each phase.
u, 19v, and 19w are position signals Hu,
Hv and Hw are arranged at positions where the phases are delayed by a predetermined phase, for example, 10 [deg], with respect to the zero cross point of the induced voltages Eu, Ev and Ew. When the pulse width of the one-shot pulse P is 0, that is, when the operation is performed using the commutation signals Sup to Swn that match the phases of the position signals Hu, Hv, and Hw, the predetermined phase is determined when the rated load operation is performed. The input current to the permanent magnet motor 16 is determined to be minimum (the efficiency is maximum). The position signals Hu, Hv, Hw detected in this manner serve as reference phases for delaying the phases of the commutation signals Sup to Swn in the control of the energization phase described below.

Now, as described above, the permanent magnet motor 1
In the case of driving the motor 6, the phase delay of the motor current increases as the rotation speed increases and the load torque increases. Therefore, the energization phase control of the commutation signals Sup to Swn is performed as follows according to the rotation speed and the load torque.

As shown in FIG. 8, when a rising edge or a falling edge of the position signals Hu, Hv, Hw is inputted, the pulse generation circuit 24 outputs the conversion shown in FIG. The commutation signal S is based on the addition voltage Va of the voltage Vf having the characteristic and the voltage Vp having the characteristic shown in FIG.
A one-shot pulse P having a pulse time width equal to the delay time from up to Swn is generated. As shown in the characteristic diagram of FIG. 5, the pulse time width of the one-shot pulse P decreases as the rotation speed increases and the load torque increases. Therefore, the phase correction amount corresponding to the pulse time width decreases as the load torque increases.

The characteristic shown in FIG. 5 is for the voltage Va obtained by adding the voltage Vf proportional to the frequency and the voltage Vp proportional to the load torque. Therefore, the frequency and the load torque influence each other on the pulse width. However, the state in which the permanent magnet motor 16 is constantly operated (the number of rotations,
If the characteristic curve shown in FIG. 5 is set in advance in accordance with (load torque), it is possible to control to the optimum energization phase.

Thereafter, as shown in FIG. 8, in the phase delay circuit 26 in the conduction control circuit 25, the position signals Hu, H
v and Hw are corrected position signals Hu 'delayed by the pulse width,
Hv 'and Hw', and after being multiplied by 3 in the multiplying circuit 27 to form a multiplied signal Q, a multiplied synchronizing pulse having a resolution of (60/256) [deg] is generated through the multiplying synchronizing pulse generating circuit 28. Can be The multiplied synchronization pulse is counted up by the counter 29 and becomes a read address (read timing signal) of the ROMs 30 to 32 in which the sine wave modulation signal data is stored.

The sine-wave modulated signal data output from the ROMs 30 to 32 are converted into analog voltages by the D / A converters 33 to 35, respectively, to obtain the sine-wave modulated signal shown in FIG. This sine wave modulation signal and the triangular wave generation circuit 3
The triangular wave signal as a carrier signal output from 9 is
Similarly to the normal PWM modulation, the upper arm commutation signals Sup, Svp, Swp, and the lower signals which are the inverted signals of the upper arm commutation signals having the same waveform as the terminal voltages Vu, Vv, Vw shown in FIG. Arm commutation signals Sun, Svn, Swn are obtained.

When these commutation signals Sup to Swn are applied to the bases of the switching elements 2 to 7, the inverter circuit 1
4 outputs a voltage delayed by the pulse width of the one-shot pulse P with respect to the position signals Hu, Hv, Hw, and a sinusoidal current flows through the stator windings 16u, 16v, 16w to rotate the permanent magnet motor 16. Drive.

The modulation signal data stored in the ROMs 30 to 32 may have a waveform as shown in FIG. In this case, the terminal voltage waveform is 0 [V] during a substantially half cycle as shown in FIG. By using such modulation signal data, the maximum output voltage of the inverter circuit 14 can be increased.

As described above, according to the present embodiment, the position signal Hu detected by the position detector 19u is frequency-to-voltage converted to generate the voltage Vf proportional to the rotation speed, and the DC link current IL is peak-held. A voltage Vp proportional to the load torque is generated by inputting to the circuit 22. Then, a one-shot pulse P whose pulse width changes according to the added voltage Va of the two voltages Vf and Vp is generated, and the commutation signal delayed by the pulse width with reference to the phase of the position signals Hu, Hv and Hw. The permanent magnet motor 16 is driven using Sup to Swn.

For such processing, an expensive microcomputer is not used, and a rotation speed detection circuit 20 composed of a frequency-voltage conversion circuit, a peak hold circuit 22, an addition circuit 23 composed of an operational amplifier, and a pulse generation composed of a CR circuit and a comparison circuit are used. The circuit 24, the PLL circuit type multiplied synchronous pulse generating circuit 28, the counter 29, and other hardware circuits can be constituted alone, so that the cost can be reduced and the development period of the drive device is shortened because program development is not required. can do. Further, even when the high-speed rotation or multi-pole permanent magnet motor 16 is driven, there is no problem in processing speed as in the case of software processing.

In this case, the rotation speed and the load torque are obtained from the position signal Hu and the DC link current IL, respectively.
The configuration is low in cost and simple as compared with the case where expensive rotation speed detectors and torque detectors are used.

Further, even with a hardware configuration, the energization phase is controlled according to the rotation speed and the load torque, so that the permanent magnet motor 16 can be operated with high efficiency. In this case, the pulse width, which is the phase correction amount, is controlled as a function of the added voltage Va of the voltage Vf proportional to the rotation speed and the voltage Vp proportional to the load torque. Compared with the conventional example in which an independent phase correction amount is prepared for each torque, the phase correction amount can be easily controlled without having a two-dimensional table map. Further, since the detection phases of the position signals Hu, Hv, Hw are set so that the phase correction amount at the time of rated load operation becomes 0, the phase correction amount does not become too large as a whole, and stable driving is performed. It can be carried out.

In addition, since the correction position signals Hu ', Hv', and Hw 'are multiplied to obtain a sufficient angular resolution, sine wave PWM modulation is performed based on the angular position information. A sinusoidal current flows through the windings 16u, 16v, and 16w, and vibration and noise during operation can be reduced.

When the motor is used for constant speed driving or constant torque driving, or when it is sufficient to control the energization phase only for one of the rotation speed and the load torque, the voltages Vf and Vp are added. Instead, any one of the voltages may be directly input to the pulse generation circuit 24.

(Second Embodiment) Next, a second embodiment of the present invention will be described.
An embodiment will be described with reference to FIG. The same components as those in FIG. 6 are denoted by the same reference numerals, and description thereof will be omitted. Hereinafter, different components will be described.

FIG. 11 is a block diagram showing the configuration of the power supply control circuit 25. The configuration for delaying the position signals Hu, Hv, Hw is different from that of the first embodiment shown in FIG. That is, the position signals Hu, Hv, and Hw are directly input to the multiplication circuit 27, and are multiplied by three.
Is generated, and a multiplied synchronization pulse having a resolution of (60/256) [deg] is generated in the multiplied synchronization pulse generating circuit 28.

Counter 43 as read control means
Counts up the multiplied synchronization pulse and presets the count value to a specific value at the fall of the one-shot pulse P. In this case, the one-shot pulse P is generated six times in one cycle (see FIG. 8), but the preset may be performed once or more in one cycle. This counter 43
, The counter 43 outputs the position signal H
A read address (read timing signal) delayed by u, Hv, and Hw by the pulse width of the one-shot pulse P is output. Therefore, the phase of the sine wave modulation signal data output from the ROMs 30 to 32, that is, the phases of the commutation signals Sup to Swn, are optimally controlled according to the pulse width of the one-shot pulse P.

According to such a configuration, the same effect as in the first embodiment can be obtained, and the commutation signal Sup can be obtained without using the phase delay circuit 26 used in the first embodiment.
To Swn can be controlled.

(Other Embodiments) The present invention is not limited to the embodiment described above and shown in the drawings.
The following extensions or modifications are possible. The carrier signal may be a sawtooth wave in addition to a triangular wave. The rotation speed detection circuit 20 performs frequency-voltage conversion based on an arbitrary one of the position signals Hu, Hv, and Hw, and the multiplied signals Q, Q obtained by multiplying the position signals Hu, Hv, Hw by three. May be used to perform frequency-voltage conversion. With such a configuration, the detection accuracy of the rotation speed can be improved.

Although the torque is detected by inputting the DC link current IL detected by the current detector 21 to the peak hold circuit 22, the torque may be detected by averaging or sample-holding the DC link current IL. good.

[0052]

The drive device for a permanent magnet motor according to the present invention
As described above, it is composed of only hardware circuits without using a microcomputer. That is, in response to the position signal, a pulse generating means for generating a one-shot pulse having a time width corresponding to the torque detected by the torque detecting means or the rotation speed detected by the rotation speed detecting means, and a phase of the position signal as a reference. And a conduction control means for delaying the phase of the commutation signal by the time width of the one-shot pulse.

Therefore, the cost can be reduced because an expensive microcomputer is not required, and the development period of the drive device can be shortened because the program development is not required. Further, since the problem of the processing speed does not occur, it is suitable for a high-speed rotating or multi-pole permanent magnet motor.

Further, the pulse generation means shortens the time width of the one-shot pulse with an increase in the torque or the number of revolutions, so that the energization phase can be optimally controlled, and the permanent magnet motor can be operated with high efficiency. Can drive.
In this case, the torque is detected based on the DC link current,
Since the number of rotations is detected based on the frequency of the position signal, a low-cost and simple driving device can be obtained.

[Brief description of the drawings]

FIG. 1 is an electrical configuration diagram of a drive device for a permanent magnet motor according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a relationship between a frequency and a voltage Vf.

FIG. 3 is a diagram showing a peak hold operation.

FIG. 4 is a diagram showing the relationship between load torque and voltage Vp.

FIG. 5 is a diagram illustrating a relationship between a voltage Va and a pulse width of a one-shot pulse.

FIG. 6 is a block diagram showing a configuration of an energization control circuit 25;

FIG. 7 is a diagram showing timings of an induced voltage and a position signal.

FIG. 8 is a diagram showing timings of a position signal, a one-shot pulse, a correction position signal, and a multiplication signal.

FIG. 9 is a waveform diagram of a carrier signal, a modulation signal, a terminal voltage, and a line voltage.

FIG. 10 is a diagram corresponding to FIG. 9;

FIG. 11 is a view corresponding to FIG. 6, showing a second embodiment of the present invention.

[Explanation of symbols]

1 is a DC power supply (DC power supply circuit), 2 to 7 are switching elements, 14 is an inverter circuit, 16 is a permanent magnet motor,
16u, 16v, 16w are stator windings, 17 is a rotor,
19u, 19v, 19w are position detectors (position detection means), 20 is a rotation speed detection circuit (rotation speed detection means), 21
Is a current detector (torque detecting means), 22 is a peak hold circuit (torque detecting means), 24 is a pulse generating circuit (pulse generating means), 25 is an energization control circuit (energization control means), and 29 and 43 are counters (readout). Control means), 3
Reference numerals 0 to 32 denote ROMs (storage means).

Claims (7)

[Claims] 1. An inverter circuit including a switching element and sequentially energizing a stator winding of a permanent magnet motor, a DC power supply circuit for supplying electric power to the inverter circuit, and corresponding to a rotational position of a rotor of the permanent magnet motor. Position detection means for detecting the position signal obtained, at least one of a torque detection means for detecting the torque of the permanent magnet motor and a rotation speed detection means for detecting the rotation speed of the permanent magnet motor, and in response to the position signal. Pulse generating means for generating a one-shot pulse having a time width corresponding to one or both of the torque detected by the torque detecting means and the rotational speed detected by the rotational speed detecting means; and a switching element of the inverter circuit. The commutation signal whose phase is delayed by the time width of the one-shot pulse with respect to the phase of the position signal. Driving device for a permanent magnet motor, characterized in that a current supply control means for outputting a. 2. The power supply control means according to claim 1, wherein the energization control means generates a correction position signal by delaying the position signal detected by the position detection means by a time width of a one-shot pulse, and generates a commutation signal based on the correction position signal. Claim 1 characterized by the following:
A driving device for a permanent magnet motor according to any one of the preceding claims. 3. An energization control unit includes a storage unit that stores modulation signal data of a commutation signal, and a read control that outputs a timing signal for reading the modulation signal data based on a position signal detected by a position detection unit. And means,
2. The method according to claim 1, wherein the timing signal of the read control unit is delayed by a time width of a one-shot pulse.
A drive device for the permanent magnet motor according to the above. 4. The permanent magnet motor driving device according to claim 1, wherein the torque detecting means detects the torque based on a DC link current flowing from the DC power supply circuit to the inverter circuit. . 5. The drive of the permanent magnet motor according to claim 1, wherein the rotation speed detection means detects the rotation speed based on the frequency of the position signal detected by the position detection means. apparatus. 6. The pulse generating means shortens the time width of the one-shot pulse in accordance with one or both of an increase in the torque detected by the torque detecting means and an increase in the rotational speed detected by the rotational speed detecting means. Claim 1 characterized by the following:
6. The driving device for a permanent magnet motor according to any one of claims 1 to 5. 7. The position detecting means detects a position signal having a phase such that an input current to a permanent magnet motor during a rated load operation is minimized when the time width of the one-shot pulse is 0. A driving device for a permanent magnet motor according to any one of claims 1 to 6.