JP2020156166A - Switched reluctance motor control device and switched reluctance motor control method - Google Patents

Abstract

To provide a switched reluctance motor control device and a control method, capable of improving motor efficiency in a high-speed range in a switched reluctance motor.SOLUTION: An SR motor 1 is driven by a driver circuit 2 including bridge circuits 30U, 30V, 30W provided independently for each phase. The driver circuit 2 is controlled by an energization control unit 3. The energization control unit 3 includes: a rotation speed detection unit 14 for detecting the rotation speed of the SR motor 1; a rotation speed determination unit 15 for comparing the motor rotation with a predetermined threshold value; and an energization mode switching unit 16 for switching the energization mode based on the comparison result. The energization mode switching unit 16 switches the energization mode of the motor from normal energization, in which the motor is energized sequentially in the order of U→V→W→U.. to thinned energization, in which the motor is energized in the order of U→W→V→U .. omitting one phase from the normal energization sequence when the motor speed is higher than the threshold value.SELECTED DRAWING: Figure 2

Description

The present invention relates to a control technology for a switched reluctance motor (SR motor: Switched Reluctance Motor, hereinafter abbreviated as SR motor as appropriate), and particularly, a switched reluctance motor capable of improving motor efficiency in a high rotation range as compared with the conventional case. Control device and switched reluctance motor control method.

In recent years, in the field of rotary electric machines such as motors and generators, the demand for SR motors that do not use permanent magnets for rotors has increased, and in recent years, SR motors have been used as integrated starter generators (ISGs) for automobile engines. The one using is also appeared. The SR motor has a stator in which a plurality of inward salient poles are formed, and a rotor arranged inside the stator and having a plurality of outward salient poles, and a plurality of SR motors wound around the salient poles on the stator side. By selectively energizing the phase exciting coils, the inward salient pole of the stator magnetically attracts the outward salient pole of the rotor, and the rotor is generated with rotational torque.

Such an SR motor is driven and controlled by an independent drive circuit for each phase. For example, in the case of a three-phase drive SR motor, three independent drive circuits are used. An inverter circuit using a switch element such as a FET is arranged in the drive circuit of each phase, and the SR motor is rotationally driven by appropriately switching the energization of each phase exciting coil. For example, in a three-phase (U, V, W phase) SR motor, the exciting coil is sequentially changed to U → V → W → U → V → W → U ... Depending on the rotation position of the rotor. Energize and drive the rotor to rotate.

JP-A-2018-68055 JP-A-2017-208890

However, like other electric motors, the SR motor also has a characteristic that the torque becomes small in the high rotation range (TN characteristic) (FIG. 7), and as shown in FIG. 8, per phase in the high rotation range. Since the energizing time of the is shortened, it becomes difficult for the energizing current to reach the command current value. In particular, in the case of high rotation exceeding the rated rotation speed (for example, 2000 rpm), the current value of the exciting coil shifts to energization of the next phase before reaching the energizing current, and it becomes difficult for the energizing current to reach the command current value. For this reason, the conventional SR motor has a problem that the motor efficiency is inevitably lowered at high rotation speed.

An object of the present invention is to provide a switched reluctance motor control device and a switched reluctance motor control method capable of improving motor efficiency in a high rotation range in an SR motor.

The switched reluctance motor control device of the present invention includes a stator having a plurality of salient poles, a rotor having a plurality of salient poles different from the salient poles of the stator, and a plurality of phases wound around the stator. This is a control device for a switched reluctance motor, which comprises a coil of the above and is driven by an energization control circuit independently provided for each of the plurality of phases, and the control device provides an energization mode for the coil. , The energization mode switching unit that selectively switches between normal energization in which the coils of the respective phases are sequentially excited in a predetermined order and thinning energization in which the coils of the respective phases are omitted from the predetermined order and excited every other phase. It is characterized by having.

In the present invention, the control device of the switched reluctance motor, which is driven and controlled independently for each phase by the energization control circuit, is provided with an energization mode switching unit capable of switching the energization mode, and each phase coil is designated. Normal energization, in which the coils are sequentially excited in order, and thinning energization, in which each phase coil is omitted from the order of normal energization and excited every other phase, are selectively switched. As a result, for example, thinning energization can be performed when the switched reluctance motor rotates at a high speed, and the energization time per phase can be longer than that during normal energization. Therefore, it becomes easy to achieve a desired command current value, and torque loss can be reduced.

Further, the thinning energization can reduce the number of ON / OFF times of the energization control circuit, suppress the heat generation of the circuit, and reduce the switching loss. Further, the copper loss is reduced by reducing the number of times the coil is energized, and the motor drive frequency is also suppressed, so that the iron loss can be reduced. Therefore, the total motor loss in the high rotation range is reduced, and the motor efficiency is improved.

The switched reluctance motor control device is provided with a rotation speed detection unit that detects the rotation speed of the switched reluctance motor, a rotation speed of the switched reluctance motor detected by the rotation speed detection unit, and a predetermined threshold value. A rotation speed determination unit for comparison may be further provided, and the energization mode switching unit may switch between the normal energization and the thinning energization based on the determination result of the rotation speed determination unit. In this case, the energization mode switching unit may enable the thinning energization when the rotation speed of the switched reluctance motor is in a high rotation range equal to or higher than the threshold value. Further, when the rotation speed of the switched reluctance motor is in the low to medium rotation speed range below the threshold value, the normal energization may be performed.

Further, the switched reluctance motor may be a motor used for an automobile starter generator such as ISG.

The switched reluctance motor control method of the present invention includes a stator having a plurality of salient poles, a rotor having a plurality of salient poles different from the salient poles of the stator, and a plurality of phases wound around the stator. It is a control method of a switched reluctance motor provided with the coil of the above and driven by an energization control circuit provided independently for each of the plurality of phases, and the energization form for the coil is set to the above-mentioned each phase. It is characterized by selectively switching between normal energization in which the coils are sequentially excited in a predetermined order and thinning energization in which the coils of the respective phases are omitted from the predetermined order and excited every other phase.

In the present invention, in a switched reluctance motor in which each phase is independently driven and controlled by an energization control circuit, normal energization in which each phase coil is sequentially excited in a predetermined order and normal energization in which each phase coil is normally energized. It is carried out by selectively switching the thinning energization to excite by omitting every other phase from the order of. As a result, for example, thinning energization can be performed when the switched reluctance motor rotates at a high speed, and the energization time per phase can be longer than that during normal energization. Therefore, it becomes easy to achieve a desired command current value, and torque loss can be reduced.

Further, the thinning energization can reduce the number of ON / OFF times of the energization control circuit, suppress the heat generation of the circuit, and reduce the switching loss. Further, the copper loss is reduced by reducing the number of times the coil is energized, and the motor drive frequency is also suppressed, so that the iron loss can be reduced. Therefore, the total motor loss in the high rotation range is reduced, and the motor efficiency is improved.

In the switched reluctance motor control method, the rotation speed of the switched reluctance motor may be detected and compared with a predetermined threshold value, and the normal energization and the thinning energization may be switched based on the comparison result. In this case, when the rotation speed of the switched reluctance motor is in a high rotation range equal to or higher than the threshold value, the thinning energization may be performed. Further, when the rotation speed of the switched reluctance motor is in the low to medium rotation speed range below the threshold value, the normal energization may be performed.

Further, the switched reluctance motor may be a motor used for an automobile starter generator such as ISG.

According to the switched reluctance motor control device of the present invention, the switched reluctance motor control device, which is independently driven and controlled for each phase by the energization control circuit, is provided with an energization mode switching unit capable of switching the energization mode. Since normal energization, in which each phase coil is sequentially excited in a predetermined order, and thinning energization, in which each phase coil is omitted from the order of normal energization and excited every other phase, are selectively switched, for example. When the switched reluctance motor rotates at a high speed, thinning energization can be performed, and the energization time per phase can be longer than that during normal energization. This makes it easier to achieve the desired command current value and makes it possible to reduce the torque loss.

Further, the thinning energization can reduce the number of ON / OFF times of the energization control circuit, suppress the heat generation of the circuit, and reduce the switching loss. Further, the copper loss is reduced by reducing the number of times the coil is energized, and the motor drive frequency is also suppressed, so that the iron loss can be reduced. Therefore, the total motor loss in the high rotation range is reduced, and the motor efficiency is improved.

According to the switched reluctance motor control method of the present invention, in a switched reluctance motor in which each phase is independently driven and controlled by an energization control circuit, normal energization in which each phase coil is sequentially excited in a predetermined order and normal energization are performed. Since each phase coil is omitted from the normal energization order every other phase and the thinning energization for excitation is selectively switched and executed, for example, the thinning energization is carried out when the switched reluctance motor becomes high rotation. This makes it possible to take a longer energizing time per phase than when energizing normally. This makes it easier to achieve the desired command current value and makes it possible to reduce the torque loss.

Further, the thinning energization can reduce the number of ON / OFF times of the energization control circuit, suppress the heat generation of the circuit, and reduce the switching loss. Further, the copper loss is reduced by reducing the number of times the coil is energized, and the motor drive frequency is also suppressed, so that the iron loss can be reduced. Therefore, the total motor loss in the high rotation range is reduced, and the motor efficiency is improved.

It is a block diagram which shows the structure of the switched reluctance motor control system which is one Embodiment of this invention. It is explanatory drawing which shows the energization control form of the excitation coil in the switched reluctance motor control system of FIG. It is explanatory drawing which shows each energization pattern at the time of normal energization and the thinning energization. It is explanatory drawing which shows the displacement of a rotor at the time of thinning energization. It is explanatory drawing which shows the flow of the magnetic flux at the time of normal energization and the thinning energization. It is explanatory drawing which shows the difference of the motor loss at the time of normal energization and the thinning energization. It is explanatory drawing which shows the relationship between the rotation speed and torque in an SR motor. It is explanatory drawing which shows the relationship between the command current value and energization current in the conventional SR motor.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a switched reluctance motor control system 10 (hereinafter abbreviated as control system 10) using a switched reluctance motor control device according to an embodiment of the present invention. The control method according to the above is also implemented in the control system 10. The control system 10 according to the present invention switches the energization form from the normal sequential energization of each phase to the thinning energization that omits the energization every other phase when the SR motor is in the high rotation range, thereby causing torque loss at high rotation. We are trying to improve the motor efficiency.

As shown in FIG. 1, the control system 10 controls a switched reluctance motor 1 (hereinafter abbreviated as SR motor 1), a driver circuit 2 for adjusting the energization timing of the SR motor 1, and a driver circuit 2. It is composed of an energization control unit (switched reluctance motor control device) 3 that controls the operation of the SR motor 1. The SR motor 1 driven by the control system 10 is applied to, for example, a starter generator (ISG) of a vehicle engine, and is used by being directly connected to the crankshaft of the engine.

The SR motor 1 includes a stator 5 having an exciting coil (winding) 4 and a rotor 6 rotatably arranged in the stator 5. The stator 5 is provided with a plurality of salient poles (stator salient poles: 6 poles in this case) 7 projecting inward in the radial direction. A three-phase exciting coil 4 (4U, 4V, 4W) is wound around each salient pole 7. A plurality of salient poles (rotor salient poles: 4 poles in this case) 8 are provided on the outer periphery of the rotor 6 so as to project outward in the radial direction. The number of salient poles 8 is different from that of the salient poles 7 on the stator 5 side. The rotation position of the rotor 6 is detected by a rotation detection sensor 9 such as a resolver. Then, by selectively energizing each exciting coil 4 according to the rotor rotation position, the rotor salient pole 8 is magnetically attracted to the stator salient pole 7, a rotational torque is generated in the rotor 6, and the SR motor 1 rotates. Drive.

As shown in FIG. 1, the energization control unit 3 includes a current command map 11, a PWM (Pulse Width Modulation) duty calculation unit 12, a rotation position detection unit 13, a rotation speed detection unit 14, a rotation speed determination unit 15, and an energization mode switching. The main components are a unit 16, a commutation signal generation unit 17, a drive signal generation unit 18, and a synchronous rectification unit 19. The control system 10 controls the driver circuit 2 based on the torque command / power generation amount command 21, supplies electric power to the SR motor 1 from the battery 22, and drives and controls the SR motor 1.

The torque command / power generation amount command 21 sets and instructs a value corresponding to the torque and the power generation amount required for the SR motor 1. The command value in the torque command / power generation amount command 21 is appropriately set in the range of 0 to 100% with respect to the maximum torque and the maximum power generation amount, for example, according to the engine load and the like. The current command map 11 is a map in which the torque command value and the command current value are stored in association with each other, and the command current value corresponding to the torque command value is selected and output. The command current value refers to a target value of the current flowing through each winding of the SR motor 1 in order to achieve the torque command value.

The PWMduty calculation unit 12 determines the duty of the current flowing from the driver circuit 2 to the SR motor 1 based on the winding current value detected by the current sensor (current detecting means) 23 and the command current value from the current command map 11. It is calculated and supplied to the drive signal generation unit 18. The rotation position detection unit 13 converts the analog signal output from the rotation detection sensor 9 into a digital signal, and outputs the analog signal to the commutation signal generation unit 17 and the rotation speed detection unit 14. The rotation speed detection unit 14 obtains the difference between the signals supplied from the rotation position detection unit 13, detects the rotation speed of the SR motor 1, and provides it to the energization mode switching unit 16.

The rotation speed determination unit 15 compares the rotation speed of the SR motor 1 obtained by the rotation speed detection unit 14 with a predetermined threshold value, and the state of the rotation speed of the SR motor 1, that is, the SR motor 1 rotates from low to medium. Determine whether it is in the range or in the high rpm range. The energization mode switching unit 16 is energized based on the determination result (whether the SR motor 1 is in the low to medium rotation range or the high rotation range) by the rotation speed determination unit 15 and the torque command value from the torque command / power generation amount command 21. (Each phase is energized sequentially or thinned out), and the energization pattern for the exciting coil 4 is switched.

Under the instruction from the energization mode switching unit 16, the commutation signal generation unit 17 is a U-phase, V-phase, and W-phase energization pattern signal (each) based on the rotor rotation position detected by the rotation position detection unit 13. Phase sequential energization or thinning energization) is formed. The drive signal generation unit 18 generates a PWM control signal based on the energization pattern signal supplied from the commutation signal generation unit 17 and the duty signal supplied from the PWM duty calculation unit 12, and supplies the PWM control signal to the driver circuit 2. The generated PWM control signal is obtained by superimposing a PWM signal based on a duty signal supplied from the PWM duty calculation unit 12 on a U-phase, V-phase, or W-phase energization pattern signal.

When the SR motor 1 functions as a generator, the synchronous rectifier unit 19 controls the regenerative operation and switches between the supply mode and the regenerative mode. In the control system 10, the supply mode is executed based on the rotor rotation position, and the regeneration mode is terminated based on the winding current value (regenerative current value) detected by the current sensor 23. In the supply mode, a current is supplied from the driver circuit 2 to the exciting coil 4 based on the command of the synchronous rectifying unit 19. The regeneration mode is performed after a certain dead time has passed after the end of the supply mode. Then, when the regenerative current value of the exciting coil 4 becomes equal to or less than a predetermined value, the regenerative mode is terminated and the synchronous rectification in the regenerative operation is terminated.

The driver circuit 2 switches the DC power output from the battery 22 according to the drive signal supplied from the drive signal generation unit 18, and supplies the DC power to the exciting coils 4 constituting each phase of the SR motor 1. In the driver circuit 2, bridge circuits (energization control circuits) 30U, 30V, and 30W are formed for each phase, and three-phase drive circuits are independently provided. Each of the bridge circuits 30U, 30V, and 30W is provided with four FETs (FETs 31 to 34), which are semiconductor switch elements. Two FETs are provided on the upper side (battery 22 side: high side) and two FETs on the lower side (low side) of the SR motor 1 (high side: FETs 31a to 31c, 34a to 34c, low side: FETs 32a to 32c). , 33a-33c). The FETs 31 to 34 are appropriately turned ON / OFF by the drive signal from the drive signal generation unit 18.

In such a control system 10, when the SR motor 1 is driven, the exciting coils 4 of each phase are sequentially excited by the independent drive circuits of each phase to rotate the rotor 6. At that time, for example, when exciting the U phase, the drive signal generation unit 18 turns on the FET 31a on the upper stage side and the FET 32a on the lower stage side, and energizes the U phase exciting coil 4U of the SR motor 1. Similarly, the drive signal generation unit 18 sequentially excites the V phase (FET31b / FET32b: ON) and the W phase (FET31c / FET32c: ON) using their respective drive circuits (U → V → W → U ... ), The SR motor 1 is rotationally driven.

On the other hand, when the SR motor 1 is used as a generator, the synchronous rectifier unit 19 controls the FETs 31 to 34 to regenerate the electric power to the battery 22 side (power supply side). For example, in the U-phase regenerative operation, the FET 31a and the FET 32a are turned on to perform the supply mode, and then the FET 33a and the FET 34a are turned on to perform the regenerative mode with a dead time in between. Further, the regenerative operation in the V phase and the W phase is also performed in the same manner. In the V phase, the supply mode is performed by the FET 31b and the FET 32b, and the regeneration mode is performed by the FET 33b and the FET 34b. In the W phase, the supply mode and the FET 33c are performed by the FET 31c and the FET 32c. And the FET 34c perform the regeneration mode, respectively.

Here, as described above, as the rotation speed of the SR motor increases, the energizing time per phase becomes shorter, and it becomes difficult for the energizing current to reach the command current value. Further, there is a problem that the motor efficiency is lowered in the high rotation speed region due to an increase in switching loss due to an increase in the number of ON / OFF times of the switch element. Therefore, in the control system 10 according to the present invention, when the SR motor 1 has a high rotation speed exceeding the rated rotation speed (for example, 2000 rpm), the energization mode is changed from sequential energization of each phase to thinning energization to reduce the motor efficiency. Suppress. FIG. 2 is an explanatory diagram showing an energization control mode in the control system 10.

As shown by the broken line in FIG. 2, the SR motor 1 also energizes each phase in sequence in the low to medium rotation range in the same manner as the normal SR motor. That is, the exciting coil 4 is energized in the order of U → V → W → U → V → W ... While overlapping the energization angles (energization time) of each phase. On the other hand, when the SR motor 1 is in the high rotation range, the energized phases are thinned out every other one.
U → (V) → W → (U) → V → (W) → U → (V) → W ... (Phases in parentheses are thinned out)
The exciting coil 4 is energized in the order of. That is, as shown by the solid line in FIG. 2, the exciting coil 4 is energized by skipping one next phase during normal energization.

In the control system 10, such thinning energization control is carried out as follows. Here, first, the rotation speed detection unit 14 detects the rotation speed of the SR motor 1 and sends it to the rotation speed determination unit 15. In the rotation speed determination unit 15, the rotation speed of the SR motor 1 obtained by the rotation speed detection unit 14 is compared with a predetermined threshold value (here, the rated rotation speed is 2000 rpm), and the SR motor 1 is set to the low to medium rotation speed range. It is determined whether there is (rotation speed <threshold) or in the high rotation speed range (rotation speed ≥ threshold). The determination result is sent to the energization mode switching unit 16, and when the SR motor 1 is in the low to medium rotation range, the energization mode switching unit 16 has the maximum output according to the normal energization pattern (each phase sequential energization: normal energization mode). Carry out the drive.

On the other hand, when the SR motor 1 is in the high rotation range, the energization pattern is determined in consideration of the current motor operating state. The motor operating state is determined based on the torque command value from the torque command / power generation amount command 21, and when the SR motor 1 should be driven with an emphasis on output, such as when the load is large, the maximum is based on the normal energization pattern. Output drive is performed. On the other hand, when the rotation speed is high but the load is not so large, the motor efficiency is emphasized, the energization pattern is switched to the thinning energization mode, and the maximum efficiency drive is performed.

FIG. 3 is an explanatory diagram showing each energization pattern during normal energization and thinning energization. As shown in FIG. 3, the thinned-out energization is a control mode in which the next energized phase (V phase in FIG. 3) in the normal sequential energization of each phase is omitted. At that time, the thinned-out phase is energized in the adjacent phase. Is extended to make up for it. For example, in the U-phase energization in FIG. 3, the energization (W phase) before that is omitted, but that amount is compensated by the advance angle A. Further, the portion of the V phase that is omitted after the U phase is compensated by the extended energization angle B. Due to the advance angle A and the extension energization angle B, even if the energization for one phase is omitted, sufficient energization is performed to attract the rotor salient pole 8, and the rotation of the rotor 6 is maintained.

FIG. 4 is an explanatory diagram showing the displacement of the rotor 6 when the thinning energization is applied. Note that FIG. 4 shows a case where the stator salient pole 7 has 12 poles and the rotor salient pole 8 has 8 poles. However, as shown in FIG. 1, the stator salient pole 7 has 6 poles and the rotor salient pole 8 has 4 poles. The same applies to the case of. As shown in FIG. 4, when the rotor salient pole 8 comes from the position of the U-phase salient pole 7 (FIG. 4 (a)) to the position of the thin-out phase (V-phase) salient pole 7 during the thinning energization (FIG. 4). 4 (b)) Since the thinned V-phase is not energized, no attractive force is generated at the V-phase salient pole 7 (dead torque section: see FIG. 2). However, the rotation of the rotor 6 is maintained by an external force such as inertia or engine power. It is also compensated by the above-mentioned extension of energization. Then, when the W phase skipped by one is excited, it is attracted to the salient pole 7 and the rotation is continued (FIG. 4 (c)).

FIG. 5 is an explanatory diagram showing the flow of magnetic flux during normal energization and thinning energization, and the rotor operation is as shown in FIG. 5 when viewed in terms of the flow of magnetic flux. In the thinning energization shown in FIG. 5B, the rotor salient pole 8 is attracted to the U-phase stator salient pole 7 by the U-phase energization, and then a dead torque section without magnetic flux is formed. Then, when the W phase is energized after that, the rotor salient pole 8 is attracted to the W phase stator salient pole 7, and the rotor 6 rotates.

On the other hand, in the case of normal energization, as shown in FIG. 5A, the excitation form of each phase is U phase alone → U, V phase overlap → V phase alone → V, W phase overlap → W phase alone. Control proceeds as such. That is, unlike the thinning energization control, there is a section in which the two phases are overlapped and energized. In this case, when two-phase energization occurs, there are places where the magnetic fluxes associated with the two-phase simultaneous energization flow, or the residual magnetic flux of the previous phase and the magnetic flux of the current energizing phase flow in opposite directions, and the alternating magnetic field at those places increases iron loss. .. On the other hand, in the thinning energization, since there is a dead torque section without magnetic flux, there is no section where the magnetic flux is complicated, and the loss can be reduced by that amount, and the motor efficiency is improved.

As described above, the control system 10 according to the present invention is different from the original energization pattern in which one phase is thinned out from the normal energization pattern by using the three-phase independent drive configuration when the SR motor 1 rotates at high speed. By carrying out thinning energization, the energization time per phase at high rotation speed can be longer than that at normal energization. Therefore, there is a time allowance for the energizing current to reach the command current value, the command current value corresponding to the desired torque command value can be easily achieved, and the torque loss can be reduced.

In addition, the thinning energization can reduce the number of ON / OFF times of the switch element, suppress the heat generation of the element per hour, and reduce the switching loss in the high rotation range due to the increase in the number of ON / OFF times. Further, the copper loss is reduced by reducing the number of times the exciting coil 4 is energized, and the motor drive frequency is also suppressed, so that the iron loss can be reduced. Therefore, the total motor loss in the high rotation range is reduced, and the motor efficiency can be improved in this respect as well. FIG. 6 is an explanatory diagram showing the difference between the motor loss during normal energization and thinning energization, the broken line shows the loss in the case of the normal energization pattern, and the solid line shows the loss in the case of thinning energization. As shown in FIG. 6, the loss reduction area P due to the thinning energization is larger than the loss increase area Q due to the thinning energization, and it can be seen that the loss of the entire motor is reduced and reduced by the thinning energization.

It goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist thereof.
For example, in the above-described embodiment, the high rotation speed is determined based on the rated rotation speed, and the control mode of normal energization and thinning energization is switched, but the determination standard for the high rotation speed is limited to the rated rotation speed. However, it can be appropriately set according to the specifications of each motor, such as the number of salient poles of the SR motor and the battery voltage. For example, it is also possible to apply the present invention to an SR motor in which 1000 rpm or 3000 rpm is used as a determination criterion in a high rotation range. In addition to the motor rotation speed, the control mode can be switched based on the motor current value, vehicle speed, temperature, etc., and the control mode can be switched by using them in combination as appropriate. good.

Further, in the embodiment of FIG. 1, the SR motor in which the stator salient pole 7 is 6 poles and the rotor salient pole 8 is 4 poles has been described, but in the present invention, as shown in FIG. 4, the stator salient pole 7 has 12 poles. The rotor salient pole 8 can also be applied to an SR motor having 8 poles, and the number of salient poles is not particularly limited. In addition, in the above-described embodiment, an example in which the present invention is applied to a three-phase drive SR motor is shown, but the present invention can also be applied to a multi-phase drive SR motor other than the three-phase drive such as a five-phase drive. is there. In that case, the SR motor driven by the odd-numbered phase is more suitable as an application target of the present invention because the phases to be thinned out are equalized. It is also possible to perform thinning energization control not only in the high rotation region but also in the entire rotation region.

The motor control device / control method according to the present invention can be widely applied not only to motors for ISG, but also to in-vehicle motors such as motors for driving radiator fans, motors for other industrial equipment, motors for home appliances, and the like. Is.

1 Switched reluctance motor 2 Driver circuit 3 Energization control unit (Switched reluctance motor control device)
4 Excitation coil 4U U phase excitation coil 4V V phase excitation coil 4W W phase excitation coil 5 stator 6 rotor 7 salient pole 8 salient pole 9 rotation detection sensor 10 switch trilatance motor control system 11 current command map 12 PWMduty calculation unit 13 rotation position Detection unit 14 Rotation speed detection unit 15 Rotation speed determination unit 16 Energization mode switching unit 17 Commuting signal generation unit 18 Drive signal generation unit 19 Synchronous rectification unit 21 Torque command / power generation command 22 Battery 23 Current sensor 30U, 30V, 30W Bridge Circuit (energization control circuit)
31,31a-31c FET
32,32a to 32c FET
33,33a-33c FET
34,34a-34c FET
A advance angle B extended energization angle

Claims (10)

A stator having a plurality of salient poles, a rotor having a plurality of salient poles different from the salient poles of the stator, and a multi-phase coil wound around the stator are provided.
It is a control device of a switched reluctance motor provided with an energization control circuit independently provided for each of the plurality of phases.
In the control device, the coil is energized by normal energization in which the coils of the respective phases are sequentially excited in a predetermined order, and thinning out in which the coils of the respective phases are omitted from the predetermined order every other phase and excited. A switched reluctance motor control device characterized by having an energization mode switching unit that selectively switches between energization and energization. In the switched reluctance motor control device according to claim 1.
The controller further
A rotation speed detection unit that detects the rotation speed of the switched reluctance motor,
It has a rotation speed determination unit that compares the rotation speed of the switched reluctance motor detected by the rotation speed detection unit with a predetermined threshold value.
The energization mode switching unit is a switched reluctance motor control device characterized by switching between the normal energization and the thinning energization based on the determination result of the rotation speed determination unit. In the switched reluctance motor control device according to claim 2.
The switched reluctance motor control device is characterized in that the switched reluctance motor control unit performs the thinning energization when the rotation speed of the switched reluctance motor is in a high rotation range equal to or higher than the threshold value. In the switched reluctance motor control device according to claim 2 or 3.
The switched reluctance motor control device is characterized in that when the rotation speed of the switched reluctance motor is in the low to medium rotation range below the threshold value, the normal energization is performed. In the switched reluctance motor control device according to any one of claims 1 to 4.
The switched reluctance motor is a switched reluctance motor control device, which is used for a starter generator of an automobile. A stator having a plurality of salient poles, a rotor having a plurality of salient poles different from the salient poles of the stator, and a multi-phase coil wound around the stator are provided.
It is a control method of a switched reluctance motor driven by an energization control circuit provided independently for each of the plurality of phases.
The energization form for the coil is selected from normal energization in which the coils of the respective phases are sequentially excited in a predetermined order and thinning energization in which the coils of the respective phases are omitted from the predetermined order every other phase and excited. A switched reluctance motor control method characterized by switching to. In the switched reluctance motor control method according to claim 6,
The rotation speed of the switched reluctance motor is detected and compared with a predetermined threshold value.
A switched reluctance motor control method characterized by switching between the normal energization and the thinning energization based on the comparison result. In the switched reluctance motor control method according to claim 7.
A switched reluctance motor control method, characterized in that the thinning energization is performed when the rotation speed of the switched reluctance motor is in a high rotation speed range equal to or higher than the threshold value. In the switched reluctance motor control method according to claim 7 or 8.
A switched reluctance motor control method, characterized in that normal energization is performed when the rotation speed of the switched reluctance motor is less than the threshold value in the low to medium rotation range. In the switched reluctance motor control method according to any one of claims 6 to 9.
The switched reluctance motor control method, wherein the switched reluctance motor is used for a starter generator of an automobile.

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