JPH08103097A - Torque control method of switching-form reluctance motor - Google Patents

Abstract

PURPOSE: To reduce the torque ripples of a switching reluctance motor, by suppressing the reduction of its torque when changing its field excitation phases. CONSTITUTION: In the torque control method of a switching reluctance motor 6, by a velocity-loop control (1), a torque command Tc is determined. Then, by both polarities of the torque command Tc and the electrical angle sensed through a pulse coder 7, the signals for determining the excitation phases of the motor 6 are outputted from functional signal generating circuits 8A-8C. By these signals and the torque command Tc, respective current command ir (A)-ir (C) are determined. Further, prior to a predetermined electrical angle whereat the excitation of its phase which has been excited is cut off, the electrical angle of the phase current command of this phase is made large by a correction circuit 10, according to the movement quantity of the electrical angle. Based on such phase current commands, current-loop controls (3A-3C, etc.) are performed, and the motor 6 is driven while its respective phases are excited via power amplifiers 4A-4C. Since each phase current command is made large in the latter half part of the excitation interval of each phase, the reduction of its torque is corrected in these latter half parts, and its torque ripples are suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torque control system for a switch type reluctance motor, and more particularly to a system for reducing torque ripple.

[0002]

2. Description of the Related Art In a switch type reluctance motor, salient poles are provided on a rotor and a stator, and a salient pole is excited by exciting a current through a winding wound around the salient pole of the stator. The magnetic attraction force pulls the rotor salient poles to generate a rotational force. Therefore, in the reluctance type motor, the coils to be excited are sequentially switched by the switch.

FIG. 10 is a diagram for explaining a method of rotating a reluctance motor. When the A-phase coil is excited in the positional relationship between the rotor and the stator shown in FIG. 10A, the rotor starts rotating counterclockwise, and the rotor and the stator shown in FIG. When the B-phase coil is excited in the positional relationship, the rotor starts rotating counterclockwise. Similarly, when the C-phase coil is excited in the positional relationship between the rotor and the stator shown in FIG. Start rotating counterclockwise. On the contrary, when the B-phase coil is excited in (a) of FIG. 10, the C-phase coil is excited in (b) of FIG. 10 and the A-phase coil is excited in (c) of FIG. To start rotating in the direction. Therefore, the phase of the winding to be energized is determined according to the position of the rotor, that is, the electrical angle of the rotor, regardless of the direction of the current flowing through the stator winding.

FIG. 11 is a diagram for explaining the torque in the reluctance motor. For example, as shown in (a) of FIG. 11, the A-phase salient pole 20A of the stator 20 and one salient pole 21a of the rotor 21 start winding from the A-phase winding (the salient pole 20A is wound around the salient pole 20A). When a current is applied to the winding 20), the A-phase salient pole 20A of the stator 20 attracts the rotor salient pole 21a and generates a torque for rotating the rotor 21 in the counterclockwise direction in FIG. Then, FIG. 11B
As shown in (4), when a current flows through the A phase up to the position where the A phase salient pole 20A of the stator 20 and the rotor salient pole 21a completely face each other, counterclockwise torque is generated. On the other hand, when a current is passed through the A phase to a position where the rotor 21 further rotates counterclockwise from the position of the rotor 21 shown in FIG. 11B, a torque in the clockwise direction is generated. That is, the torque is always generated in the direction of decreasing the magnetic resistance.

Therefore, as shown in FIG. 11A, the rotor position where the A-phase salient salient pole 20A and one salient pole of the rotor 21 do not face each other is set to an electrical angle of 0 degree, and the salient salient poles 20A and the rotor salient poles are arranged. The rotor position in FIG. 11 (b) where the poles completely face each other is an electrical angle of 180 degrees, and the rotor position where the rotor salient pole does not face the stator salient pole 20A at all is an electrical angle 360.
Assuming that the electric angle is 0 to 180 degrees, a counterclockwise torque is generated when electricity is applied between 180 degrees and 36 degrees.
When energized during 0 degrees, clockwise torque is generated.

In the case of a three-phase switch type reluctance motor, the A, B, and C-phase salient stator poles are arranged so as to be offset by an electrical angle of 120 degrees, and the A-phase stator salient pole and the rotor salient pole are set with reference to the A-phase. The electric angle is 0 degree at the position where
When the rotor rotates 120 degrees, the salient poles of the B-phase stator and the salient poles of the next rotor start overlapping, and
When rotated by 20 degrees, the C-phase salient poles and the next rotor salient poles start to overlap with each other, and the A-phase has an electrical angle of 0.
From 120 degrees to 120 degrees, then the B phase from 120 degrees to 240 degrees in electrical angle, then the C phase from 240 degrees to 36 degrees.
When it is excited up to 0 degree and thereafter is sequentially excited in the same manner as the A, B, and C phases, the rotor rotates in one direction (counterclockwise direction). Conversely, if the A phase is excited from 360 degrees to 240 degrees, the C phase is from 240 degrees to 120 degrees, and the B phase is from 120 degrees to 0 degrees, the rotor will rotate clockwise.

However, for example, when the phase A is excited between the electrical angle of 0 to 180 degrees, a torque is generated in the counterclockwise direction. Therefore, the excitation section is longer than 120 degrees and is (120 + β) degrees. (120 + β <180)
Excitation is performed, and the B and C phases are also shaken so that the excitation interval width is set to (120 + β) degrees (for example, Japanese Patent Laid-Open No. 3-169).
289). Further, since the magnitude of the generated torque in the excitation section of the electrical angle of 0 ° to 180 ° varies depending on the electrical angle, the applicant of the present application has developed a method of advancing the phase to perform excitation. Patent application was filed as No. 154315.

[0008]

FIG. 2 is a diagram showing the torque generated from the motor when switching the excitation phase. For example, the phase A from the position of the electrical angle α to the electrical angle width (120 + β).
If the B phase is similarly excited with an electrical angle width of (120 + β) with a phase difference of 120 degrees, the generated torque is large in the first half of the excitation section and the generated torque decreases in the latter half of the excitation section. The torque generated at the time of switching is reduced and torque ripple occurs. Therefore, an object of the present invention is to provide a control method of a switch type reluctance motor that suppresses the reduction of the generated torque at the time of switching the excitation phase and reduces the torque ripple.

[0009]

DISCLOSURE OF THE INVENTION According to the present invention, when the excitation of each phase is canceled when switching the excitation phase, a phase current command for a phase excited a predetermined electrical angle amount before the electrical angle position at which the excitation is canceled. Is increased to increase the excitation current from a predetermined electrical angle amount before the electrical angle position at which the excitation is released to a electrical angle at which the excitation is released. This corrects the decrease in the generated torque and suppresses the occurrence of torque ripple. In particular,
The phase current command for the phase that has been excited for a predetermined amount of electric angle before the electric angle position for releasing the excitation is increased at a predetermined ratio in proportion to the magnitude of the moving electric angle amount from the position before the predetermined amount of electric angle. .

[0010]

[Function] In the switch type reluctance motor,
The generated torque is large in the first half of the excitation section in each phase and decreases in the latter half, causing torque ripple.
By increasing the phase current command in the latter half of the exciting section, the exciting current is increased and the generated torque is increased. As a result, the occurrence of torque ripple is suppressed.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a main part of a control unit of a three-phase switch type reluctance motor embodying the present invention.

The speed loop compensating circuit 1 performs speed loop control processing based on the difference between the speed command Vc and the actual speed of the reluctance motor 6 output from the frequency / voltage converter 9, and outputs a torque command Tc. The multipliers 2A, 2B and 2C are the torque command Tc and the A, B and C phase function signal generators 8A and 8A, respectively.
The phase current command i is multiplied by the signals output from 8B and 8C and having a phase difference of 120 degrees according to the electrical angle θ of the motor 6.
It outputs r (A), ir (B), and ir (C). When switching the excitation phase, the current correction circuit 10 increases the phase current command for the phase for which excitation is turned off from the electrical angle position that is a predetermined amount before the setting of the electrical angle for which excitation is turned off. The configuration operation of the current correction circuit 10 will be described later.

The current loop compensating circuits 3A, 3B and 3C have respective phase current commands ir (A), ir (B) and ir (C) and corresponding phase currents ic (detected by the current detectors 5A, 5B and 5C. A)
, Ic (B), ic (C), the current loop control process is performed, and the phase voltage commands er (A), er (B), er (C) are output to the power amplifiers 4A, 4B, 4C, respectively. . The power amplifiers 4A, 4B and 4C are composed of a PWM inverter circuit or the like, receive the phase voltage commands er (A), er (B) and er (C), and receive the phase voltage er '(A), er' (B ), Er '(C) are applied to each phase of the motor 6 to drive the motor 6.

The frequency / voltage converter 9 converts the output of the pulse coder 7 attached to the motor 6 from frequency to voltage and outputs a voltage according to the actual speed of the motor 6. G1 (S) is a transfer function of the speed loop compensation circuit 1,
G2 (S) is a transfer function of the current loop compensation circuits 3A, 3B, 3C. G3 is a power amplifier 4A, 4B, 4
It is the gain of C.

The circuit described above is substantially the same as the control circuit of the conventional switch type reluctance motor except that the current correction circuit 10 is added. However, in this embodiment, the function signal generators 8A, 8B and 8C are different from the conventional ones. The function signal generators 8A, 8B, and 8C for each phase have two types of energization section patterns according to the torque direction generated in the motor 6, and 120 degrees phase for each phase according to the electrical angle of the rotor for each pattern. It has a ROM in which shifted function signal values are stored, and the direction of the generated torque is determined by the positive and negative signs of the torque command Tc output from the speed loop compensation circuit 1, and the two types of energization described above are conducted. The section pattern is selected, the electrical angle of the rotor is judged by the signal output from the pulse coder 7, and the function signals corresponding to the electrical angle are output to the multipliers 2A, 2B, 2C, respectively.

That is, for example, when it is judged from the torque command Tc that the torque command is counterclockwise, (a) in FIG.
The energization section pattern of each phase shown in (d) is selected, and the function signal is read from the ROM and output to the multipliers 2A, 2B, 2C according to the electrical angle θ of the rotor. Further, when it is determined from the torque command Tc that the torque command is in the clockwise direction, FIG.
The energization section pattern of each phase shown in (b) and (c) is selected. That is, in the case of a counterclockwise torque command, A
For the phase, the detected electrical angle is θ1 = α
The function signal “1” is output up to 4 = (120 + β + α), and “0” is output at other electrical angles. Similarly, for the B phase, the electrical angle θ3 = (120 + α) degrees to the electrical angle θ6
= (240 + β + α), the function signal “1” is output,
"0" is output at other electrical angles. For the C phase, the electrical angle θ5 = (240 + α) degrees to the electrical angle θ2 = (360
The function signal “1” is output until + β + α = β + α), and “0” is output at other electrical angles.

It should be noted that α is an excitation advance angle, which is a set value. Further, β is a parameter that determines the excitation interval of each phase. Α and β are set so that (120 + β + α) degrees <180 degrees in electrical angle, and α = 0 and β = 0 may be set. Further, in the case of the torque command in the clockwise direction, the function signal “1” is output for the A phase from the detected electrical angle θ9 = (240−β−α) to the electrical angle θ12 = (360−α). , "0" is output at other electrical angles. For the B phase, the function signal “1” is output from the electrical angle θ11 = (− β−α = 360−β−α) degrees to the electrical angle θ8 = (120−α), and is “0” at other electrical angles. , Electrical angle θ7 for C phase =
From (120-β-α) degree, electrical angle θ10 = (240-α)
The function signal "1" is output up to, and "0" is output at other electrical angles. The current correction circuit 10 is a circuit for compensating for the decrease in the torque generated when switching the excitation phase, and increases the excitation current of the phase being excited from the electrical angle position that is a predetermined amount before the electrical angle at which the excitation is cut off. Therefore, the phase command current is sequentially increased from a predetermined amount before excitation disconnection.

3 and 4 are explanatory views of the operation for increasing the phase current command. Figure 3 shows counterclockwise rotation (CC
It is explanatory drawing at the time of rotating in the direction which electric angle (theta) increases at the time of (W rotation). When the phase current command of the excitation phase is ir and this excitation is canceled at the electrical angle θ0, the phase current command ir is obtained from the position (θ0 −δ) before the electrical angle of the amount δ set by the electrical angle θ0.
And the phase current command i at the electrical angle position θ0 at which the excitation is released
Increase the phase current command by k times r (k is a set value) and ir
The phase current command is corrected so that it becomes (1 + k). As a result, when the electrical angle θ is in the range of θ0-δ <θ ≦ θ0, the phase current command ir is calculated by the following formula 1.

Ir = ir + k · ir [θ- (θ0-δ)] / δ = ir [1+ (k / δ) (θ-θ0 + δ)] (1) FIG. 4 rotates clockwise (CW rotation). FIG. 6 is an explanatory diagram when the electrical angle θ is decreasing during the operation. In this case, when the electrical angle θ is in the range of θ0 <θ ≦ θ0 + δ, the phase current command ir is obtained by performing the calculation of the following two equations.

Ir = ir + k · ir [(θ0 + δ) −θ] / δ = ir [1+ (k / δ) (θ0 + δ−θ)] (2) The excitation of each phase is canceled as described above. At that time, the phase current command is sequentially set by the set amount ir (1+
Since it increases up to k), the generated torque increases, which compensates for the decrease in the generated torque in the latter half of the excitation and prevents the occurrence of torque ripple.

6 to 9 are flow charts relating to the correction processing of the phase current command executed by the processor which controls the switch type reluctance motor. The processor executes the processing of FIGS. 6 to 9 every predetermined period, and first reads the commanded speed Vc and the actual speed detected by the pulse coder 7 via the frequency / voltage converter 9 as in the conventional case, and executes the speed loop processing. To determine the torque command Tc (step S
1). Then, depending on the polarity of the torque command Tc and the electrical angle detected by the pulse coder 7, the function generating circuits 8A to 8A
From the function signal value (“1”, “0”) of the pattern shown in FIG. 5 generated from C, the phase current command ir (A) of each phase,
ir (B) and ir (C) are obtained (step S2). next,
While reading the electrical angle θ from the pulse coder 7, the rotation direction of the rotor is determined by the order of the A phase and B phase signals that are 90 degrees out of phase from the pulse coder, and the direction of the torque command is determined from the torque command Tc. It is determined (steps S3, S4, S5).

When the rotor rotation direction is counterclockwise (CCW rotation) and the torque command direction is counterclockwise (CCW direction) (during acceleration in the counterclockwise direction), the energization section pattern shown in FIG. Each phase is excited by. Therefore, whether or not the electrical angle θ read in step S3 is between the electrical angle θ2 for releasing the excitation from the position (θ2-δ) before the electrical angle θ2 for releasing the C-phase excitation by the electrical angle amount δ, that is, , (Θ2-
δ) <θ ≤ θ2 is judged and the phase current command ir (C) of the C phase is determined.
It is determined whether or not it is the correction section (step S6). If it is not this correction section, then the electrical angle θ is the phase current command i of the A phase.
Whether or not (θ4-δ) <θ ≦ θ4 of the correction section of r (A) (step S7), and if it is not this correction section, (θ6− of the correction section of the phase current command ir (B) of the B phase δ) <θ ≤ θ
It is determined whether or not 6 (step S8). If there is no correction section, the phase current command ir (A) obtained in step S2,
ir (B) and ir (C) are output (step S9), and the phase current correction process ends. Based on this phase current command, the same process as the conventional process is performed.

When it is determined in step S6 that the phase current command correction section for the C phase is reached, the process proceeds to step S10, and the following three formulas are calculated based on the above formula 1 and the corrected phase current command ir (C ) ' ir (C) ′ = ir (C) [1+ (k / δ) (θ−θ2 + δ)] (3) Then, the obtained corrected phase current command ir (C) ′ is used as the phase current command ir (C). (Step S11), the process proceeds to step S9 to output each phase current command.

When it is determined in step S7 that the phase current command correction section for the A phase is reached, the process proceeds to step S12, and the following four formulas are calculated based on the above formula 1 to perform the correction phase current command ir. (A) 'is calculated. ir (A) ′ = ir (A) [1+ (k / δ) (θ−θ4 + δ)] (4) Then, the obtained corrected phase current command ir (A) ′ is used as the phase current command ir (A). (Step S13), the process proceeds to step S9, and each phase current command is output.

If it is determined in step S8 that it is the phase current command correction section of the B phase, the process proceeds to step S14, and the following five formulas are calculated based on the above formula 1 and the corrected phase current command ir (B ) ' ir (B) ′ = ir (B) [1+ (k / δ) (θ−θ6 + δ)] (5) Then, the obtained corrected phase current command ir (B) ′ is used as the phase current command ir (B). (Step S15), the process proceeds to step S9, and each phase current command is output. By performing the above processing, δ is the electrical angle that is used to cancel the excitation in the excitation section of each phase.
Phase current commands ir (A), ir (B), ir
Since (C) is increased, the generated torque is increased, and the reduction of the generated torque that occurs when switching the excitation phase is suppressed and the occurrence of torque ripple is prevented.

On the other hand, when it is determined in steps S4 and S5 that the rotation direction is counterclockwise (CCW direction) and the torque command direction is clockwise (CW direction) (deceleration during counterclockwise rotation), Control goes to step S16. In this case, each phase is excited in the energization section pattern shown in FIG. The electrical angle θ is the correction section of the phase current command of the B phase (whether θ8−δ <θ ≦ θ8 (step S16), C
Whether or not the phase current command correction section (θ10−δ) <θ ≦ θ10 (step S17) and the phase A phase current command correction section (θ12−δ) <θ ≦ θ12 (step S18) If it is determined that there is no correction section (the process proceeds to step S9, the correction section (θ8−δ) of the phase current command of the B phase).
If <θ ≦ θ8, the following six equations are calculated based on Equation 1 to obtain a B-phase corrected current command ir (B) ′, which is used as the B-phase current command ir (B) ( Steps S19 and S2
0).

Ir (B) ′ = ir (B) [1+ (k / δ) (θ−θ8 + δ)] (6) Similarly, the correction section (θ10−δ) <θ of the phase current command of the C phase
If ≦ θ10, the following seven equations are calculated to obtain the C-phase correction current command ir (C) ′, which is the C-phase current command ir.
(C) (steps S21 and S22). ir (C) '= ir (C) [1+ (k / [delta]) ([theta]-[theta] 10+ [delta])] (7) Further, the correction interval ([theta] 12- [delta]) <[theta] ≤ of the phase current command of the A phase.
If θ12, the following eight equations are calculated to obtain the correction current command ir (A) 'for the A phase, which is the phase current command ir (A) for the A phase.
(Steps S23 and S24).

Ir (A) ′ = ir (A) [1+ (k / δ) (θ−θ12 + δ)] (8) In this way, the phase current command is corrected, and the process proceeds to step S9.
The uncorrected phase outputs the phase current command obtained in step S2, and the corrected phase current command outputs this corrected phase current command.

On the other hand, if it is determined in step S4 that the rotation is clockwise, the process proceeds to step S25 to determine the torque command direction. If the torque command is clockwise (acceleration of clockwise rotation), In this case, since the excitation command for each phase is output in the energization section pattern shown in FIG. 5C, the electrical angle θ read in step S3 is the phase current command correction section θ7 ≦ θ for the C phase. <(Θ7 + δ), whether the phase current command correction section of the A phase θ9 ≦ θ <(θ9 + δ),
It is determined whether or not the phase current command correction section θ11 ≦ θ <(θ11 + δ) of the B phase (steps S26, S27, S28), and if there is no section, the phase current command ir obtained in step S2.
(A), ir (B), and ir (C) are output in step S9.

Further, the phase current command correction section of the C phase θ7 ≦ θ
If <(θ7 + δ) (step S26), since the rotation direction is clockwise, the rotor is rotating from the larger electrical angle to the smaller electrical angle. By doing so, a correction current command ir (C) 'for the C phase is obtained, and this is used as a phase current command ir (C) for the C phase (step S2
9, S30). ir (C) '= ir (C) [1+ (k / [delta]) ([theta] 7+ [delta]-[theta])] (9) In addition, the correction interval [theta] 9 <[theta] <([theta] 9+
If δ), the following 10 equations are calculated to obtain the correction current command ir (A) 'for the A phase, and this is used as the phase current command ir (A) for the A phase (steps S31, S32). ir (A) ′ = ir (A) [1+ (k / δ) (θ9 + δ−θ)] (10) If the correction interval θ11 ≦ θ <(θ11 + δ) of the phase current command of the B phase, Is calculated and the B phase correction current command ir is calculated.
(B) ′ is obtained and used as the phase current command ir (B) for the B phase (steps S33, S34). ir (B) ′ = ir (B) [1+ (k / δ) (θ11 + δ−θ)] (11) Then, the process proceeds to step S9, and the phase without correction is the phase current command obtained in step S2. The corrected phase current command output and the corrected phase current command are output.

If it is determined in step S25 that the torque command is a counterclockwise torque (during deceleration of rotation in the clockwise direction), in this case, each phase is subjected to the energization section pattern shown in FIG. 5 (d). Since the excitation command is output, whether the electrical angle θ read in step S3 is the phase current command correction section θ1 ≦ θ <(θ1 + δ) of the A phase, or the phase current command correction section θ3 ≦ of the B phase. It is determined whether or not θ <(θ3 + δ), the phase current command correction section of C phase θ5 ≦ θ <(θ5 + δ) (steps S35, S36, S37), and if there is no section, the phase obtained in step S2 Current command ir (A), ir
(B) and ir (C) are output in step S9.

Phase current command correction section for phase A θ1 ≦ θ <(θ
1 + δ) (step S35), based on Equation 2,
The following 12 equations are calculated and the phase A correction current command ir (A) '
Is obtained, and this is set as the phase current command ir (A) of the A phase (steps S38, S39). ir (A) ′ = ir (A) [1+ (k / δ) (θ1 + δ−θ)] (12) If the phase current command correction section of the B phase θ3 ≦ θ <(θ3 + δ) (step S36), Based on the equation 2, the following 13 equations are calculated to obtain the B-phase corrected current instruction ir (B) ', which is used as the B-phase current instruction ir (B) (step S40,
S41). ir (B) ′ = ir (B) [1+ (k / δ) (θ3 + δ−θ)] (13) If the phase current command correction section of the C phase θ5 ≦ θ <(θ5 + δ) (step S37), The following 14 equations are calculated to obtain the C-phase correction current command ir (C) ', which is used as the C-phase phase current command ir (C) (steps S40 and S41). ir (C) ′ = ir (C) [1+ (k / δ) (θ5 + δ−θ)] (14) Then, the process proceeds to step S9, and the phase without correction is the phase current command obtained in step S2. The corrected phase current command output and the corrected phase current command are output.

By performing the above processing, the phase current commands ir (A), ir (B), and ir (C) increase from the position δ before in the amount of electrical angle for releasing the excitation in the excitation section of each phase. Therefore, the generated torque is increased, the decrease of the generated torque that occurs when switching the excitation phase is suppressed, and the occurrence of torque ripple is prevented. In the above-described embodiment, k that determines the correction amount of the phase current command may be a function of the speed (command) and may be set to "0" or small for high speed and large for low speed. Further, the set value δ that determines the position where the correction starts may also be a function of the speed (command). Also,
In the above embodiment, the correction amount of the phase current command is increased in proportion to the moving electrical angle amount, but the correction section may be divided into several sections and the correction amount may be increased stepwise.

[0034]

As described above, according to the present invention, the reduction of the generated torque caused when the excitation phase is switched is increased by increasing the excitation current by increasing the phase current command of the excited phase. It is possible to reduce torque ripple at the time of phase switching.

[Brief description of drawings]

FIG. 1 is a block diagram of a main part of a control unit of a three-phase switch reluctance motor according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a torque generated by excitation and a torque ripple.

FIG. 3 is an explanatory diagram of phase current correction during counterclockwise rotation.

FIG. 4 is an explanatory diagram of phase current correction during clockwise rotation.

FIG. 5 is an explanatory diagram of an energization section pattern according to an embodiment of the present invention.

FIG. 6 is a part of a flowchart of a phase current command correction process executed by the processor in the embodiment.

FIG. 7 is a continuation of the flowchart.

FIG. 8 is a continuation of the flowchart.

FIG. 9 is a continuation of the flowchart.

FIG. 10 is a diagram illustrating a method of rotating a reluctance motor.

FIG. 11 is a diagram illustrating torque in a reluctance motor.

[Explanation of symbols]

 1 Speed Loop Compensation Circuit 3A-3C Current Loop Compensation Circuit 4A-4C Power Amplifier 6 Switch Reluctance Motor 7 Pulse Coder 8A-8C Function Signal Generation Circuit 9 Frequency / Voltage Converter 10 Correction Circuit

Claims (2)

[Claims] 1. In a torque control method for a switch type reluctance motor, when the excitation of each phase is released at the time of switching the excitation phase, the phase for the phase that has been excited before a predetermined electrical angle amount from the electrical angle position at which the excitation is released. Increase the current command,
A method for controlling torque of a switch type reluctance motor, wherein the exciting current is increased from a predetermined amount of electrical angle before the position of releasing the excitation to an electrical angle of releasing the excitation. 2. A phase current command for a phase that has been excited for a predetermined amount of electrical angle before the electrical angle position for releasing the excitation is proportional to the magnitude of the amount of moving electrical angle from the position before the predetermined amount of electrical angle. The torque control method for a switch type reluctance motor according to claim 1, wherein the torque is increased at a predetermined ratio.