JP2003289697A - Motor driving unit, method for controlling characteristics of reactor and computer readable recording medium for recording program for executing characteristic control of reactor for computer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor driving unit which can easily change magnetic characteristics of a reactor according to a drive state of a motor or a drive mode of an automobile. <P>SOLUTION: The motor driving unit comprises the reactor 10, a moving means 11, a current sensor 13, an updating means 32 and a DC power source B1. The reactor 10 includes a core 110 including core members 101 to 104. The updating means 32 obtains a gap length LG corresponding to a reactor current LCRT detected by the sensor 12, generates a signal MVE for moving the member 104 so as to become the obtained gap length LG, and outputs to a voltage applying circuit 112. The circuit 112 selects a predetermined voltage based on the signal MVE and applies the voltage to a piezo element 111. The element 111 is expanded or contracted according to the applied voltage to move the member 104. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor drive device capable of controlling the characteristics of a reactor for generating an input voltage supplied to an inverter for driving a motor, a control method for controlling the characteristics of the reactor, and characteristic control of the reactor. The present invention relates to a computer-readable recording medium in which a program for causing a computer to execute is recorded.

[0002]

2. Description of the Related Art Recently, as an environment-friendly vehicle, a hybrid electric vehicle (Hybrid Vehicle) and an electric vehicle (Electric Vehicle)
Has received a great deal of attention. And, the hybrid electric vehicle is partially put into practical use.

This hybrid electric vehicle is a vehicle that uses, as a power source, a DC power supply, an inverter, and a motor driven by the inverter, in addition to a conventional engine.
That is, the power source is obtained by driving the engine, and the DC voltage from the DC power source is converted into AC by the inverter, and the motor is rotated by the converted AC to obtain the power source. An electric vehicle is a vehicle that uses a DC power source, an inverter, and a motor driven by the inverter as power sources.

In such a hybrid electric vehicle or electric vehicle, a DC voltage from a DC power source is transformed (for example, boosted) and the transformed DC voltage is supplied to an inverter for driving a motor (for example, a DC voltage converter). It is considered to mount a boost chopper type converter or the like (for example, Japanese Patent Laid-Open No. 8-2).
14592). The DC voltage converter includes a reactor and a switching transistor,
The direct current from the direct current power source is switched by the switching transistor, the direct current voltage from the direct current power source is boosted to a predetermined voltage and supplied to the inverter.

Further, Japanese Patent Application Laid-Open No. 2000-331840 discloses a technique of adjusting the core gap of the reactor using a piezoelectric material in order to adjust the inductance of the reactor used in the DC voltage converter.

[0006]

[Patent Document 1] Japanese Patent Laid-Open No. 8-214592

[0007]

[Patent Document 2] Japanese Patent Laid-Open No. 2000-331840

[0008]

[Patent Document 3] Japanese Unexamined Patent Publication No. 9-199357

[0009]

[Patent Document 4] Japanese Unexamined Patent Publication No. 2-201108

[0010]

However, since the inductance of the reactor is determined so as to meet the specified specifications, when the specifications required for the reactor are large current and high voltage, the inductance saturates. And then Figure 3
As shown in Fig. 3, the inductance greatly decreases as the reactor current increases. Then, current smoothness, which is the original role of the reactor, is significantly reduced, and so-called ripple current is generated. As a result, the reactor current flowing in the reactor due to the ripple current fluctuates, the magnetic flux fluctuates due to the fluctuation of the reactor current, and the steel plates constituting the core of the reactor vibrate due to the touch of the magnetic flux,
There is a problem that noise is increased due to the vibration.

Further, the saturation of the inductance is accelerated, so that the gap portion in which the magnetic flux is concentrated is heated, which causes a problem that the loss is worsened.

As a method of preventing saturation of inductance, (1) increase the cross-sectional area of the core of the reactor, (2)
Three methods are conceivable: increasing the number of coil turns and (3) increasing the number of core gaps.

The above method (1) is a method for increasing the cross-sectional area of the core so that the magnetic flux can easily pass therethrough so that the inductance is not saturated even if the reactor current increases.

Further, the above method (2) is a method of realizing the same inductance with a smaller reactor current by increasing the number of turns of the coil, and the inductance saturation is prevented by providing the reactor with a margin. Is the way to do it.

Further, in the above method (3), since the gap length is determined with respect to a desired inductance that reduces the magnetic flux leaking from the gap, each gap length is shortened by disposing the gaps in the magnetic path. This is a method of reducing the leakage magnetic flux to prevent saturation of the inductance.

However, the above methods (1) and (2) have a problem that the size of the reactor becomes large. Further, the above method (3) has a problem that increasing the number of gaps causes restrictions in manufacturing.

The methods (1) to (3) described above can be considered as methods for preventing the deterioration of the loss in the gap, but the same problems as described above occur.

Therefore, the present invention has been made to solve the above problems, and an object thereof is to drive a motor capable of easily changing the magnetic characteristics of the reactor in accordance with the operating state of the motor or the operating mode of the automobile. It is to provide a device.

Another object of the present invention is to provide a control method capable of easily changing the magnetic characteristics of the reactor according to the operating state of the motor or the operating mode of the automobile.

Still another object of the present invention is to provide a computer-readable recording medium in which a program for causing a computer to change the magnetic characteristics of the reactor according to the operating state of the motor or the operating mode of the automobile is recorded. Is.

[0021]

According to the present invention, a motor drive device is a motor drive device for driving a motor by an inverter, and a reactor for generating an input voltage to be supplied to the inverter. A detection unit that detects the operating state of the motor and a changing unit that changes the magnetic characteristics of the core forming the reactor in accordance with the detected operating state.

Preferably, the reactor includes a core composed of a plurality of core members, and the changing means changes the magnetic characteristics by changing the gap length between the core members according to the operating condition.

More preferably, the changing means changes the gap length by moving the core member using a piezoelectric element.

Preferably, the detection means detects the reactor current flowing in the reactor to detect the operating state of the motor.

Preferably, the detecting means detects the operating state of the motor based on the torque command value which is the target value of the torque to be generated by the motor.

[0026] Preferably, the motor drive device further includes a variation reduction means. The fluctuation reducing means reduces the cyclic fluctuation of the core gap.

More preferably, the fluctuation reducing means gives the gap periodic fluctuations of opposite phase with respect to the periodic fluctuations of the core gap.

More preferably, the fluctuation reducing means includes a piezoelectric body and voltage applying means. The piezoelectric body is provided in the gap between the cores. The voltage applying unit applies to the piezoelectric body a voltage having the same phase as the current waveform of the reactor current flowing in the reactor and expanding and contracting the piezoelectric body in the circumferential direction of the core.

Further, according to the present invention, the motor drive device is a motor drive device for driving a motor for driving a vehicle by an inverter, and a reactor for generating an input voltage to be supplied to the inverter and a vehicle operation. A detection unit that detects the mode and a change unit that changes the magnetic characteristics of the core forming the reactor according to the detected operation mode are provided.

Preferably, the detecting means detects the operation mode based on the accelerator opening. More preferably, the reactor includes a core composed of a plurality of core members, and the changing unit changes the magnetic characteristic by changing the gap length between the core members according to the operation mode.

More preferably, the changing means changes the gap length by moving the core member using a piezoelectric element.

More preferably, the changing means changes the gap length according to the accelerator opening.

More preferably, the changing means holds a combination of the accelerator opening and the gap length as a map, detects the gap length corresponding to the accelerator opening from the map, and makes the detected gap length. Change the gap length between core members.

Preferably, the detecting means detects the operation mode according to the relationship between the reactor current flowing through the reactor and the accelerator opening.

More preferably, the reactor includes a core composed of a plurality of core members, and the changing means changes the magnetic characteristics by changing the gap length between the core members according to the operation mode.

More preferably, the changing means changes the gap length by moving the core member using a piezoelectric element.

More preferably, the detecting means detects that the operation mode is a high load operation mode in which the motor is driven in a high load state when the accelerator opening and the reactor current have a proportional relationship, and the accelerator opening is performed. When the operating mode is a low load operating mode in which the motor is driven in a low load state, the operating state of the motor is further detected, and the changing means is When the operation mode is detected, the gap length is changed according to the accelerator opening, and when the low load operation mode is detected, the gap length is changed according to the detected operation state.

More preferably, the detecting means detects the operating state of the motor based on the reactor current, and the changing means changes the gap length according to the reactor current when the low load operating mode is detected.

More preferably, the changing means is a first map composed of a combination of the accelerator opening and the gap length,
A second map composed of a combination of the reactor current and the gap length is held, and when the high load operation mode is detected, the gap length corresponding to the accelerator opening is extracted from the first map, and the extracted gap length is extracted. The gap length between the core members is changed so that when the low load operation mode is detected, the gap length corresponding to the reactor current is extracted from the second map, and the core member is adjusted to have the extracted gap length. Change the gap length between.

More preferably, the detecting means detects the operating state of the motor based on the torque command value which is the target value of the torque to be generated by the motor, and the changing means detects the torque when the low load operating mode is detected. Change the gap length according to the command value.

More preferably, the changing means is a first map composed of a combination of the accelerator opening and the gap length,
A second map composed of a combination of the torque command value and the gap length is held, and when the high load operation mode is detected, the gap length corresponding to the accelerator opening is extracted from the first map, and the extracted gap is stored. The gap length between the core members is changed so that the length becomes longer, and when the low load operation mode is detected, the gap length corresponding to the torque command value is extracted from the second map, and the extracted gap length is set. Change the gap length between the core members.

According to the present invention, the control method is a control method for controlling the magnetic characteristics of the core forming the reactor for generating the input voltage supplied to the inverter for driving the motor, and It comprises a first step of detecting and a second step of changing the magnetic characteristic according to the detected operating state.

Preferably, the core of the reactor is composed of a plurality of core members, and in the second step, the magnetic characteristics are changed by changing the gap length between the core members according to the operating condition.

More preferably, in the first step, the operating state of the motor is detected by detecting the reactor current flowing in the reactor.

More preferably, in the first step, the operating state of the motor is detected based on the torque command value that is the target value of the torque that the motor should generate.

Further, according to the present invention, the control method is a control method for controlling the magnetic characteristics of the core constituting the reactor for generating the input voltage supplied to the inverter for driving the vehicle driving motor. , A first step of detecting the driving mode of the vehicle, and a second step of changing the magnetic characteristic according to the detected driving mode.

Preferably, in the first step, the operation mode is issued based on the accelerator opening.

More preferably, the core of the reactor is composed of a plurality of core members, and in the second step, the magnetic characteristics are changed by changing the gap length between the core members according to the accelerator opening.

Preferably, in the first step, the operation mode is detected according to the relationship between the reactor current flowing through the reactor and the accelerator opening.

More preferably, the core of the reactor comprises a plurality of core members, and in the second step, the magnetic characteristics are changed by changing the gap length between the core members according to the operation mode.

More preferably, in the first step, when there is a proportional relationship between the accelerator opening and the reactor current, the operation mode is detected as a high load operation mode for driving the motor in a high load state, When there is no proportional relationship between the opening and the reactor current, the operation mode is detected as a low load operation mode that drives the motor in a low load state, the motor operation state is further detected, and the high load operation mode is detected. Then, the gap length is changed according to the accelerator opening degree in the second step, and when the low load operation mode is detected, the gap length is changed according to the operating state of the motor in the second step.

More preferably, in the first step, the operating state of the motor is detected based on the reactor current, and when the low load operation mode is detected, the gap length is changed according to the reactor current in the second step. To be done.

More preferably, in the first step, the operating state of the motor is detected based on the torque command value which is the target value of the torque to be generated by the motor, and when the low load operating mode is detected, the second In the step, the gap length is changed according to the torque command value.

Preferably, the control method further comprises a third step of reducing the periodic fluctuation amount of the core gap.

More preferably, the core includes a piezoelectric body provided in the gap. The third step is a voltage that is in phase with the first sub-step of detecting the reactor current flowing in the reactor and the current waveform of the detected reactor current, and that expands and contracts the piezoelectric body in the circumferential direction of the core. And a third sub-step of applying the generated voltage to the piezoelectric body.

Further, according to the present invention, a computer-readable recording medium storing a program for causing a computer to control the magnetic characteristics of the core forming the reactor for generating the input voltage supplied to the inverter for driving the motor. The medium is a computer-readable recording medium in which a program for causing a computer to execute a first step of detecting an operating state of a motor and a second step of changing a magnetic characteristic according to the detected operating state is recorded. is there.

Preferably, the core of the reactor comprises a plurality of core members, and in the second step, the magnetic characteristics are changed by changing the gap length between the core members according to the operating condition.

More preferably, in the first step, the operating state of the motor is detected by detecting the reactor current flowing in the reactor.

More preferably, in the first step, the operating state of the motor is detected based on the torque command value which is the target value of the torque that the motor should generate.

Further, according to the present invention, a computer recording a program for causing the computer to control the magnetic characteristics of the core forming the reactor for generating the input voltage supplied to the inverter for driving the vehicle driving motor. The readable recording medium is a computer-readable medium in which a program for causing a computer to execute a first step of detecting a driving mode of a vehicle and a second step of changing a magnetic characteristic according to the detected driving mode is recorded. Recording medium.

Preferably, in the first step, the operation mode is detected based on the accelerator opening.

More preferably, the core of the reactor is composed of a plurality of core members, and in the second step, the magnetic characteristics are changed by changing the gap length between the core members according to the accelerator opening.

Preferably, in the first step, the operation mode is detected according to the relationship between the reactor current flowing through the reactor and the accelerator opening.

More preferably, the core of the reactor is composed of a plurality of core members, and in the second step, the magnetic characteristics are changed by changing the gap length between the core members according to the operation mode.

More preferably, in the first step, when there is a proportional relationship between the accelerator opening and the reactor current, the operation mode is detected to be a high load operation mode for driving the motor in a high load state, When there is no proportional relationship between the opening and the reactor current, the operation mode is detected as a low load operation mode that drives the motor in a low load state, the motor operation state is further detected, and the high load operation mode is detected. Then, the gap length is changed according to the accelerator opening degree in the second step, and when the low load operation mode is detected, the gap length is changed according to the operating state of the motor in the second step.

More preferably, in the first step, the operating state of the motor is detected based on the reactor current, and when the low load operation mode is detected, the gap length is changed in accordance with the reactor current in the second step. To be done.

More preferably, in the first step, the operating state of the motor is detected based on the torque command value which is the target value of the torque to be generated by the motor, and when the low load operating mode is detected, the second In the step, the gap length is changed according to the torque command value.

Preferably, the computer-readable recording medium recording a program to be executed by a computer further comprises a third step of reducing the periodic fluctuation of the core gap.

More preferably, the core includes a piezoelectric body provided in the gap. The third step is a voltage that is in phase with the first sub-step of detecting the reactor current flowing in the reactor and the current waveform of the detected reactor current, and that expands and contracts the piezoelectric body in the circumferential direction of the core. And a third sub-step of applying the generated voltage to the piezoelectric body.

Therefore, according to the present invention, it is possible to prevent the inductance of the reactor for supplying the input voltage to the inverter for driving the motor from being saturated even when the operating state of the motor becomes a high load state.

Further, according to the present invention, the inductance of the reactor for supplying the input voltage to the inverter for driving the motor as the drive source of the vehicle is saturated even if the operation mode of the vehicle becomes the high load operation mode. Can be prevented.

Further, according to the present invention, noise in the reactor can be reduced.

[0073]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts will be denoted by the same reference characters and description thereof will not be repeated.

[First Embodiment] Referring to FIG. 1, a motor drive device 100 according to a first embodiment of the present invention includes a DC power supply B1, a reactor 10, a moving means 11, and a boosting IPM (Intelligent Power). Mo
12), current sensors 13 and 24, inverter 14, capacitor C1, and voltage sensors 20 and 2
2 and the control device 30.

The DC power source B1 is composed of a secondary battery such as nickel hydrogen or lithium ion. One end of the reactor 10 is connected to the positive electrode of the DC power source B1. The other end of the reactor 10 is connected to the intermediate point (the connection point between the emitter of Q1 and the collector of Q2) of the NPN transistors Q1 and Q2 connected in series. NPN transistor Q
The collector of 1 is connected to the power supply line, and the emitter of the NPN transistor Q2 is connected to ground. Also,
Diodes D1 and D2 for passing a current from the emitter side to the collector side are arranged between the collector and the emitter of each NPN transistor Q1 and Q2. The NPN transistors Q1 and Q2 and the diodes D1 and D2 form a boosting IPM 12. Further, the reactor 10 and the boosting IPM 12 constitute a converter.

The DC power supply B1 outputs a DC voltage. The voltage sensor 20 detects the output voltage BV of the DC power supply B1 and outputs the detected output voltage BV to the control device 30. The reactor 10 accumulates current according to the switching operation of the NPN transistor Q2 of the boosting IPM 12 to boost the DC voltage from the DC power supply B1, and synchronizes the boosted DC voltage with the timing when the NPN transistor Q2 is turned off. Is supplied to the power supply line through the diode D1.

The moving means 11 moves a part of the core constituting the reactor 10 based on a signal MVE from the control device 30 as described later. The current sensor 13 detects the reactor current LCRT flowing in the reactor 10 and controls the detected reactor current LCRT.
Output to 0.

A capacitor C1 is arranged between the power supply line, which is the output of the boosting IPM 12, and the ground to stabilize the voltage of the power supply line (the input voltage of the inverter 14). That is, the capacitor C1 supplies the stabilized DC voltage to the inverter 14 to prevent the ripple current from being generated on the side of the inverter 14 and the AC motor M1.

The voltage sensor 22 detects the voltage across the capacitor C1, that is, the input voltage IVV of the inverter 14.
Is detected, and the detected input voltage IVV is detected by the control device 30.
Output to.

The inverter 14 includes a U-phase arm 15 and a V-phase arm 15.
It comprises a phase arm 16 and a W phase arm 17. The U-phase arm 15, the V-phase arm 16, and the W-phase arm 17 are provided in parallel between the power supply line and the ground.

The U-phase arm 15 is an NPN connected in series.
It is composed of transistors Q3 and Q4, and the V-phase arm 16 is
It consists of NPN transistors Q5 and Q6 connected in series, and the W-phase arm 17 consists of NPN transistors Q7 and Q8 connected in series. Further, diodes D3 to D8 for flowing a current from the emitter side to the collector side are respectively connected between the collector and the emitter of each NPN transistor Q3 to Q8.

The intermediate point of each phase arm is connected to each phase end of each phase coil of AC motor M1. That is, AC motor M1 is a three-phase permanent magnet motor, and U, V,
One end of three W-phase coils is commonly connected to the midpoint, and the other ends of the U-phase coils are NPN transistors Q3 and Q.
4, the other end of the V-phase coil is connected to the intermediate point of the NPN transistors Q5 and Q6, and the other end of the W-phase coil is connected to the intermediate point of the NPN transistors Q7 and Q8.

Current sensor 24 detects motor current MCRT flowing through each phase of AC motor M1 and outputs the detected motor current MCRT to control device 30.

The control device 30 includes voltage sensors 20, 22.
Also, based on the detection value detected by the current sensor 24 and the torque command value of the motor, the NPN transistors Q3 to Q8 of the inverter 14 are switching-controlled by a method described later to control the drive of the AC motor M1 and boost the voltage. NPN transistors Q1 and Q2 of IPM12
Control the switching of. The control device 30 also generates a signal MVE for moving a part of the core forming the reactor 10 based on the reactor current LCRT from the current sensor 13, and outputs the generated signal MVE to the moving means 11. .

FIG. 2 is a functional block diagram of the control device 30. Referring to FIG. 2, control device 30 includes a motor torque control unit 31 and a changing unit 32. The motor torque control means 31 includes a torque command value TR, an output voltage BV of the DC power supply B1, a motor current MCRT, and a motor rotation speed MRN.
And the NPN transistor Q of the boosting IPM 12 based on the inverter input voltage IVV and the method described later.
1, a signal PWMC for turning on / off the Q2 and a signal PWMI for turning on / off the NPN transistors Q3 to Q8 of the inverter 14 are generated, and the generated signal PWMC and the signal PWMI are respectively boosted by the IPM for boosting.
12 and the inverter 14.

The changing means 32 is the current sensor 13
Based on the reactor current LCRT detected by
A signal MVE for moving a part of the core forming the reactor 10 so as to have a gap length of the core adapted to the reactor current LCRT is generated, and the generated signal M
The VE is output to the moving means 11.

Referring to FIG. 3, motor torque control means 3
Reference numeral 1 denotes a motor control phase voltage calculator 40, an inverter PWM signal converter 42, an inverter input voltage command calculator 50, and a boosting IPM duty ratio calculator 52.
And a boosting IPM PWM signal converter 54.

Motor control phase voltage calculator 40 receives input voltage IVV to inverter 14 from voltage sensor 22 and receives motor current MCRT flowing in each phase of AC motor M1.
Is received from the current sensor 24, and the torque command value TR is supplied to an ECU (Elec) provided outside the motor drive device 100.
received from the local Control Unit). Then, motor control phase voltage calculation unit 40 calculates the voltage applied to the coil of each phase of AC motor M1 based on these input signals, and the calculated result is the PWM signal conversion unit for inverter 42. Supply to. The inverter PWM signal conversion unit 42 generates a signal PWMI that actually turns on / off the NPN transistors Q3 to Q8 of the inverter 14 based on the calculation result received from the motor control phase voltage calculation unit 40, and generates the signal PWMI. Signal PWMI
To the NPN transistors Q3 to Q8 of the inverter 14.

As a result, each NPN transistor Q3 ...
Q8 is switching-controlled and controls a current flowing through each phase of AC motor M1 so that AC motor M1 outputs a commanded motor torque. In this way, the motor drive current is controlled and the motor torque corresponding to the motor torque command value is output.

On the other hand, the inverter input voltage command calculator 50
Calculates the optimum value (target value) of the inverter input voltage based on the torque command value TR and the motor rotation speed MRN,
The calculated optimum value is output to the boosting IPM duty ratio calculating unit 52. The step-up IPM duty ratio calculation unit 52 is based on the optimum value of the inverter input voltage from the inverter input voltage command calculation unit 50, the inverter input voltage IVV from the voltage sensor 22, and the output voltage BV from the voltage sensor 20. Then, the duty ratio for setting the inverter input voltage IVV from the voltage sensor 22 to the optimum value of the inverter input voltage from the inverter input voltage command calculator 50 is calculated, and the calculated duty ratio is used for the boosting IPM PWM. The signal is output to the signal conversion unit 54. The boosting IPM PWM signal converting unit 54 uses the boosting IPM duty ratio calculating unit 52 to calculate the NPN transistor Q of the boosting IPM 12 based on the duty ratio.
A signal PWMC for turning on / off 1 and Q2 is generated, and the generated signal PWMC is set to N of the boosting IPM 12.
Output to PN transistors Q1 and Q2.

By increasing the on-duty of the NPN transistor Q2 on the lower side of the boosting IPM 12, the power storage in the reactor 10 increases, so that a higher voltage output can be obtained. On the other hand, increasing the on-duty of the upper NPN transistor Q1 lowers the voltage of the power supply line. So N
By controlling the duty ratios of the PN transistors Q1 and Q2, it is possible to control the voltage of the power supply line to any voltage higher than the output voltage of the DC power supply B1.

In this way, the motor torque control means 31 of the control device 30 controls the boosting IPM 12 and the inverter 14 so that the AC motor M1 generates the torque of the torque command value input from the external ECU. Thereby, AC motor M1 generates the torque designated by the torque command value.

FIG. 4 is a perspective view showing a drive unit for driving AC motor M1 and adjusting the gap length of reactor 10. As shown in FIG. With reference to FIG. 4, the drive unit 6
0 is a reactor 10 of the motor drive device 100,
The boosting IPM 12, the inverter 14, the capacitor C1, and the control device 30 are stored. The boosting IPM 12 is arranged adjacent to the reactor 10. Inverter 14
Is arranged adjacent to reactor 10 and boosting IPM 12. The capacitor C1 is arranged above the inverter 14. The controller 30 is arranged above the capacitor C1. The DC power supply B1 is arranged outside the drive unit 60 on the side of the reactor 10 and the boosting IPM 12, and supplies a DC voltage to the reactor 10.

As described above, the drive unit 60 compactly houses the reactor 10, the boosting IPM 12, the inverter 14, the capacitor C1 and the control device 30 and is mounted in a hybrid electric vehicle or an electric vehicle. In response to this, AC motor M1 is driven and the gap length of reactor 10 is adjusted.

Referring to FIG. 5, reactor 10 is core 1.
Including 10. The core 110 is composed of core members 101 to 104. The core member 101 has a structure in which n (n is a natural number) steel plates 1011 to 101n are stacked in the z-axis direction. The core member 102 includes n steel plates 1021 to 102n.
Is laminated in the z-axis direction. Core member 103
Has a structure in which n steel plates 1031 to 103n are stacked in the z-axis direction. The core member 104 is made up of n steel plates 104.
1 to 104n are laminated in the z-axis direction.

Steel plates 1011 to 101n, 1041 to 10
Each of the 4n has a U-shape in the xy plane. Further, each of the steel plates 1021 to 102n and 1031 to 103n is composed of a quadrangular prism extending in the x-axis direction.

The core member 102 is arranged between one end 101A of the core member 101 and one end 104A of the core member 104. In this case, the core member 102 is arranged such that the distance between the one end 102A and the one end 101A of the core member 101 is L1, and the distance between the other end 102B and the one end 104A of the core member 104 is LG. To be done.
Further, the core member 103 is the other end 10 of the core member 101.
1B and the other end 104B of the core member 104 are arranged. In this case, the core member 103 has one end 103
The distance between A and the other end 101B of the core member 101 becomes L1, and the other end 103B and the other end 1 of the core member 104
It is arranged so that the distance from 04B is LG.

A coil (not shown) is wound around the core members 102 and 103. When a DC voltage from the DC power source B1 is applied to the reactor 10 and a DC current flows through the coil, the coil is wound. Magnetic flux is generated in the core members 102 and 103. The generated magnetic flux is the core member 10
1 to 104, core member 101 and core members 102 and 103
And a gap G1, G2 between the core member 104 and the core members 102, 103 and a gap G3 between the core members 102, 103.

When the magnetic flux passes through the gap G1, the magnetic flux emitted from the steel plates 1011 to 101n of the core member 101 is the steel plates 1021 to 102n of the core member 102.
Incident on each. Further, when the magnetic flux passes through the gap G3, the magnetic flux emitted from the steel plates 1021 to 102n of the core member 102 is the steel plates 1041 to 1 of the core member 104.
04n respectively. Further, the magnetic flux has a gap G
Steel plates 1041-1 of the core member 104 when passing 4
The magnetic flux emitted from 04n is the steel plate 10 of the core member 103.
31 to 103n, respectively. Further, when the magnetic flux passes through the gap G2, the steel plate 10 of the core member 103
The magnetic fluxes emitted from 31 to 103n enter the steel plates 1011 to 101n of the core member 101, respectively.

Since the core members 101 to 104 have a structure in which a plurality of steel plates are laminated as described above, the magnetic flux exists between the two adjacent steel plates of the plurality of steel plates constituting the core members 101 to 104. Easy to pass through the layers. As a result, the loss of magnetic flux can be reduced as compared with the case where the core members 101 to 104 are made of a single steel plate.

FIG. 6 shows a reactor 1 according to the present invention.
It is a figure for demonstrating the method of changing the magnetic characteristic of the 0 core 110. Referring to FIG. 6, coil 105 is wound around core members 102 and 103 so that the DC current from DC power supply B1 flows in a fixed direction. As is clear from FIG. 1, the coil 105 of the reactor 10 has an NP
A current flows through the N-transistor Q2, but in this case, the NPN transistor Q2 merely functions as a conducting wire, so that the NPN transistor Q2 is omitted in FIG.

Core member 101 and core members 102 and 103
Is L1, and this distance L1 is fixed. On the other hand, the distance between the core member 104 and the core members 102 and 103 is LG, and this distance LG is changed by moving the core member 104 in the x-axis direction by the moving means 11.

The inductance of the core 110 of the reactor 10 when a direct current is applied to the coil 105 is the gap length L1 of the gaps G1 and G2 existing between the core member 101 and the core members 102 and 103, and the core member 104.
G existing between the core member 102 and 103
3, G4 and the gap length LG. In the present invention, the gap length L1 between the core member 101 and the core members 102 and 103 is fixed, and the gap length LG between the core member 104 and the core members 102 and 103 is variable.
The inductance of the core 110 is determined mainly depending on the gap length LG.

Therefore, when the gap length L1 is included in the gap length LG, the gap length LG that does not saturate the inductance of the core 110 is determined by the following equation.

[0105]

[Equation 1]

In the equation (1), since the magnetic permeability μ of the vacuum, the magnetic flux density B, and the number of turns N of the coil are constants, the gap length LG is proportional to the current flowing through the coil 105, that is, the reactor current IL.

Therefore, according to the present invention, the reactor current IL flowing through the coil 105 is detected, the gap length LG corresponding to the detected reactor current IL is calculated from the equation (1), and the calculated gap length LG is obtained. Then, the core member 104 is moved.

The current sensor 13 detects the reactor current IL (IL = LCRT) flowing through the coil 105 and outputs the detected reactor current IL to the changing means 32. The changing unit 32 calculates the gap length LG from the equation (1) using the detected reactor current IL. Then, the changing unit 32 calculates a moving distance to move the core member 104 so that the calculated gap length LG is obtained, and generates a signal MVE for moving the core member 104 by the calculated moving distance. Output to the moving means 11.

The moving means 11 includes a piezo element 111 and a voltage applying circuit 112. The piezo element 111 is fixed to the core member 104, and expands / contracts in the x-axis direction according to the voltage applied from the voltage application circuit 112, thereby moving the core member 104 in the x-axis direction.

Referring to FIG. 7, the voltage applying circuit 112 is
The voltage divider circuit 112A and the switch circuit 112B are included.
The voltage dividing circuit 112A includes resistors 1121 to 1124. The resistors 1121 to 1124 are connected in series between the power supply node 1125 and the ground node 1126, and
Each of 21 to 1124 has the same resistance value. If the voltage VDD is supplied to the power supply node 1125, the voltage on the node N1 is VDD and the voltage on the node N2 is 3
VDD / 4, the voltage on node N3 is VDD / 2, the voltage on node N4 is VDD / 4, and the voltage on node N5 is ground voltage GND.

The switch circuit 112B has terminals 1127 ...
It is composed of 1131 and a switch S1. Terminal 1127 ~
Reference numeral 1131 denotes a voltage VDD, a voltage 3VDD / 4, and a voltage V from the nodes N1 to N5 of the voltage dividing circuit 112A, respectively.
It receives DD / 2, voltage VDD / 4, and ground voltage GND. The switch S1 receives the signal MVE from the changing means 32.
According to the above, any one of the voltages supplied to the terminals 1127 to 1131 is applied to the piezo element 111.

A method of controlling the gap length LG will be described with reference to FIG. The gap length LG is the gap length L
It shall be controlled between G1 and the gap length LG5. Then, when the gap length LG is adjusted to the gap length LG1, the changing unit 32 moves the one end 104A and the other end 104B of the core member 104 from the current position to the position P.
The voltage application circuit 112 generates the signal MVE1 so as to apply the voltage for moving to S1 to the piezo element 111.
Output to. Similarly, when the gap length LG is adjusted to the gap lengths LG2, LG3, LG4, LG5, the changing means 32 causes the one end 104A and the other end 104B of the core member 104 from the current position to the position PS.
2, signals for moving to PS3, PS4, and PS5 are applied to the piezo element 111 so that signals MVE2 and MV are applied.
Voltage application circuit 11 for generating E3, MVE4 and MVE5
Output to 2.

Position PS5 corresponds to one end 1 of core member 104.
04A and the other end 104B are core members 102 and 103.
Is the farthest position from the core member 10, that is, the position where the piezo element 111 is most expanded and contracted, and the position PS1 is the core member 10
4 has one end 104A and the other end 104B of the core member 1
02, 103, that is, the position where the piezo element 111 is most expanded, the signal MVE1
~ MVE5 switches the switch S1 to terminals 1127 ~, respectively.
This is a signal for connecting to 1131.

Therefore, the gap lengths LG1 to LG5
And signals MVE1 to MVE5 and signals MVE1 to MVE
Table 1 shows the relationship with the meaning content of No. 5.

[0115]

[Table 1]

Then, the current sensor 13 detects the reactor current IL (or LCRT), and the means 32 for changing the detected reactor current IL (or LCRT).
Then, the changing unit 32 calculates the gap length LG corresponding to the received reactor current IL (or LCRT) using the equation (1). If the changing unit 32 obtains the gap length LG1 as a result of the calculation, the changing unit 32 generates the signal MVE1 based on Table 1 and the voltage applying circuit 112 of the moving unit 11.
Output to.

The voltage application circuit 112 receives the signal MVE1 and the switch S1 is connected to the terminal 1127 based on the received signal MVE1. Then, the voltage applying circuit 11
2 applies the voltage VDD to the piezo element 111. The piezo element 111 receives the voltage VDD and expands in the x-axis direction, and the core member 104 moves in the x-axis direction so that the one end 104A and the other end 104B thereof come to the position PS1.

The position of the core member 104 is adjusted in the same manner when another gap length is obtained based on the reactor current IL (or LCRT).

In this way, the reactor current IL (or LCRT) with the gap length LG flowing through the reactor 10 is obtained.
Is adjusted to the gap length corresponding to.

When the gap length LG5 is set to the initial value, the gap length LG is adjusted to be one of the gap lengths LG1 to LG4, and the gap lengths LG1 to LG4.
4 is smaller than the gap length LG5, the initial value LG5
The position of the core member 104 is adjusted by applying a voltage to the piezo element 111 to expand the piezo element 111 in the x-axis direction. Therefore, in this case, no voltage is applied to the piezo element 111 at the initial value LG5, and when the gap length LG is adjusted to one of the gap lengths LG1 to LG4, the voltage corresponding to each of the gap lengths LG1 to LG4. Is applied to the piezo element 111.

When the gap length LG3 is set to the initial value, one end 104A of the core member 104 and the other end 10 of the core member 104.
The voltage for moving the core member 104 so that 4B comes to the position PS3, that is, the voltage VDD / 2 is applied to the piezo element 111, and the gap length LG is one of the gap lengths LG1, LG2, LG4, and LG5. Gap lengths LG1, LG2, LG4, LG5 when adjusted to
The voltage corresponding to each of the above is applied to the piezo element 111.

As described above, the control method of the gap length LG differs depending on which of the gap lengths LG1 to LG5 is selected as the initial value. However, in the present invention, any control method may be used and the gap length LG is Gap length LG1
It is sufficient that the control method is adjusted in the range of to LG5.

In the above, the changing means 32 uses the reactor current IL (LCRT) received from the current sensor 13.
It has been described that the gap length LG corresponding to is calculated using the equation (1). However, since the equation (1) is expressed as the straight line k1 shown in FIG. 9, the gap length LG and the reactor current satisfying each point on the straight line k1 are represented. The combination with IL (LCRT) may be held as a map, and the gap length LG corresponding to the reactor current IL (LCRT) received from the voltage sensor 13 may be extracted from the map.

A control method for adjusting the gap length LG of the reactor 10 according to the present invention will be described with reference to FIG. When the operation starts, the operating state of AC motor M1 is detected (step S1). AC motor M1
The operating states of AC motor M1 are U phase, V phase, and W
The current flowing in each phase coil, that is, the inverter 14
It changes depending on the current supplied to. The current supplied to the inverter 14 changes depending on the current accumulated in the reactor 10, that is, the reactor current IL (or LCRT) flowing in the coil 105 of the reactor 10. Therefore, the operating state of AC motor M1 is such that reactor current IL (or LCR) flowing through reactor 10 is
T) is detected.

When the operating state of AC motor M1 is detected, the magnetic characteristics of the core material of reactor 10 are changed according to the detected operating state (step S2). The magnetic characteristics of the core material are changed by changing the gap length LG according to the detected reactor current IL (or LCRT) as described above. In this way, when the magnetic characteristics of the core material are changed according to the operating state of AC motor M1, a series of operations ends.

Reactor 1 according to the first embodiment.
The gap length LG of 0 is actually controlled by the CPU (Ce
10 is executed by the CPU, and the CPU executes a program including ROM (Read O) including the steps of the flowchart shown in FIG.
nly Memory), the read program is executed, and the gap length LG of the reactor 10 is controlled according to the flowchart shown in FIG.

Therefore, the ROM corresponds to a computer (CPU) readable recording medium in which a program including the steps of the flowchart shown in FIG. 10 is recorded.

Referring again to FIG. 1, the motor drive device 1
The operation in 00 will be described. Torque command value T
R, output voltage BV of DC power supply B1, motor current MCR
T, inverter input voltage IVV, and motor speed M
When the RN is input to the control device 30, the motor torque control means 31 of the control device 30 causes the input torque command value T
R, output voltage BV of DC power supply B1, motor current MCR
T, inverter input voltage IVV, and motor speed M
As described above, the signal PWMI and the signal PWMC are generated based on the RN, the generated signal PWMI is output to the inverter 14, and the signal PWMC is boosted by the IPM 12 for boosting.
Output to.

In the boosting IPM 12, N
The PN transistor Q1 is turned off based on the signal PWMC, and the NPN transistor Q2 is turned on / off with a predetermined duty ratio based on the signal PWMC. Then, the DC power supply B1, the reactor 10, and the NPN transistor Q are turned on while the NPN transistor Q2 is turned on.
DC current flows through the route of 2 and DC power is supplied to the reactor 10.
Accumulated in. The DC power stored in reactor 10 is proportional to the period during which NPN transistor Q2 is turned on.

Thereafter, at the timing when the NPN transistor Q2 is turned off, the DC voltage boosted and accumulated in the reactor 10 is passed through the diode D1 to the inverter 1 and the boosted DC voltage is applied.
4 is supplied to the power line. Then, the DC voltage supplied to the power supply line is smoothed by the capacitor C1 and supplied to the inverter 14. Then, in inverter 14, NPN transistors Q3 to Q8 are turned on / off based on signal PWMI, and capacitor C
The DC voltage input via 1 is converted into an AC voltage to drive the AC motor M1. As a result, the AC motor M1
Generates the torque designated by the torque command value TR.

While the NPN transistor Q2 is on, the reactor current IL (or LCRT) flows through the coil 105 of the reactor 10 and the current sensor 13
Detects reactor current IL (or LCRT) and outputs it to control device 30. Change means 32 of control device 30
Is the input reactor current IL (or LCRT)
Gap length L of the core 110 of the reactor 10 corresponding to
G is calculated using the equation (1), and a signal MVE (one of MVE1 to MVE5) for moving the core member 104 to realize the calculated gap length LG is generated to generate the voltage of the moving means 11. Output to the application circuit 112. Then, the voltage application circuit 112 receives the input signal MVE.
Based on (one of MVE1 to MVE5), a predetermined voltage is applied to the piezo element 111, and the piezo element 111
The applied voltage expands by a predetermined amount. As a result, the core member 104 is moved by a predetermined amount, and the gap length LG
Is adjusted to the gap length corresponding to the detected reactor current IL (or LCRT).

As described above, the operating state of AC motor M1 is detected by detecting reactor current IL (or LCRT) flowing in reactor 10, and reactor 10 is detected.
Gap length LG in core 110 is adjusted according to the detected operating state of AC motor M1.

In the present invention, the core of reactor 10 may be core 120 shown in FIG. Referring to FIG. 11, core 120 includes core members 121 to 126. The core member 121 has a structure in which steel plates 1211 to 121n are stacked in the z-axis direction, the core member 122 has a structure in which steel plates 1221 to 122n are stacked in the z-axis direction, and the core member 123 includes steel plates 1231 to 123n. The core member 124 is formed by stacking steel plates 1241 to 124n in the z-axis direction, and the core member 125 is formed by stacking steel plates 1251-125n in the z-axis direction. The core member 126 has a structure in which steel plates 1261 to 126n are stacked in the z-axis direction.

The core members 121 and 126 have the same shape as the core members 101 and 104 shown in FIG. 5, respectively. The core member 122 has the one end 122 </ b> A of the core member 121.
The core member 123 is arranged so as to face one end 121A, one end 123A of the core member 123 faces the other end 122B of the core member 122, and the other end 123B of the core member 123.
26 is disposed so as to face one end 126 </ b> A of 26.

The core member 124 has one end 12
4A is arranged so as to face the other end 121B of the core member 121, the core member 125 has its one end 125A facing the other end 124B of the core member 124, and the other end 125B of the other end 126B of the core member 126. Are arranged to face each other.

Then, one end 121A of the core member 121.
And a distance between one end 122A of the core member 122 and the other end 121B of the core member 121 and one end 124A of the core member 124 are L1. In addition, the core member 122
The distance between the other end 122B of the core member 123 and the one end 123A of the core member 123 and the distance between the other end 124B of the core member 124 and the one end 125A of the core member 125 are L2. Further, the other end 123B of the core member 123 and the core member 126
The distance between the one end 126A and the other end 125B of the core member 125 and the other end 126B of the core member 126 is LG. In the core 120, the distances L1 and L2
Is fixed, and the distance LG is adjusted by the same method as described above according to the operating state of AC motor M1.

Although the core 120 is divided into a larger number of core members than the core 110, the fixed gap lengths L1 and L2 can be obtained by dividing the core 120 into a large number of core members. Gap G1 as small as possible
Even if the leakage of magnetic flux in G4 is reduced and the reactor current IL (or LCRT) changes greatly, the gap length LG in the gaps G5 and G6 is adjusted to the gap length corresponding to the reactor current IL (or LCRT). It will be easier.

In the above description, the operating state of AC motor M1 is detected by detecting reactor current IL (or LCRT) flowing in reactor 10. However, the present invention is not limited to this, and AC motor M is not limited to this.
1 is a torque command value TR which is a target value of torque to be generated
Alternatively, the operating state of AC motor M1 may be detected.

When the torque to be generated by AC motor M1 is large, the period in which NPN transistor Q2 of boosting IPM 12 is turned on becomes longer, and reactor 10 has reactor current I proportional to the torque to be generated by AC motor M1.
L (or LCRT) flows. Then, when torque command value TR input to control device 30 is large, the operating state of AC motor M1 is determined to be an operating state in which reactor current IL (or LCRT) flowing in reactor 10 is increased. Therefore, the torque command value TR
Detecting the operating state of AC motor M1 based on Eq. Is equivalent to detecting the operating state of AC motor M1 based on reactor current IL (or LCRT).

In this case, the changing means 32 of the control device 30
Receives torque command value TR in place of reactor current IL (or LCRT), detects the operating state of AC motor M1 based on the received torque command value TR, and determines core 110 (in accordance with torque command value TR. Or 12
The signal MVE for adjusting the gap length LG of 0) is generated and output to the moving means 11.

In the above description, the reactor current (or torque command value) flowing through the reactor 10 is detected, and the core member 104 (or 126) of the core 110 (or 120) is detected according to the detected reactor current (or torque command value). ) Is moved to adjust the gap length LG, the motor driving apparatus 100 may further include a mechanism for detecting that the core member 104 (or 126) is actually moved. In this case, the motor driving device 100 has the gap G3 or G4 of the core 110 (or the gap G5 or G6 of the core 120).
A magnescale is provided in the vicinity of, and the changing means 32 of the control device 30 receives the position information from the magnescale and the gap length L corresponding to the reactor current (or the torque command value).
It is determined whether or not the core member 104 (or 126) is moved so as to be G. An encoder may be arranged in addition to the magnet scale to detect the position of the core member 104 (or 126). Further, the core member 104 (or 126) can be detected by detecting the input current by the current sensor or by detecting the temperature rise by the thermistor provided in the reactor without disposing the magnet scale and the encoder.
It is also possible to detect whether or not has been moved normally. Thus, the motor drive device 100 according to the present invention
When adjusting the gap length according to the reactor current (or torque command value), a safety device that can confirm that the core member 104 (or 126) is actually moved to reach the gap length to be adjusted is provided. You may have it.

As described above, the first embodiment of the present invention
In the above, the operating state of AC motor M1 is detected by a reactor current (or torque command value) flowing through the reactor, and the detected reactor current (or torque command value) is detected, that is, in accordance with the operating state of AC motor M1. Adjust the gap length of the reactor core. As a result, as shown in FIG. 12, when the gap length of the core of the reactor was not adjusted according to the operating state of AC motor M1, the inductance of the core was significantly decreased with the increase of the reactor current (curve k2. When adjusting the gap length of the core of the reactor according to the operating state of AC motor M1, the inductance of the core gradually decreases as the reactor current increases (see straight line k3),
The magnetic characteristics of the core can be greatly improved.

[Second Embodiment] Referring to FIG. 13, a motor drive device 200 according to the second embodiment has a structure in which control device 30 of motor drive device 100 is replaced with control device 210, and the others are motor drive devices. It is the same as the device 100.
Motor drive device 200 drives AC motor M1 as a power source of the electric vehicle. Then, the control device 210
Receives an accelerator opening degree ACC indicating the degree of acceleration of the vehicle from an ECU provided outside the motor drive device 200, detects the operation mode of the electric vehicle based on the received accelerator opening degree ACC, and detects the operation mode of the reactor 10. It has a function of adjusting the gap length LG of the core 110 (or 120).

Referring to FIG. 14, control device 210 includes a motor torque control means 31 and a magnetic characteristic control means 301. The motor torque control means 31 is as described in the first embodiment. The magnetic characteristic control means 301 controls the accelerator opening degree ACC and the reactor current LCR.
In response to T, the operating mode of the electric vehicle in which the motor drive device 200 is mounted is detected based on the accelerator opening ACC, and the gap length of the core 110 (or 120) of the reactor 10 is determined according to the accelerator opening ACC. LG
To control.

In the case of an electric vehicle, since only the AC motor M1 drives the drive wheels, the accelerator opening degree ACC is proportional to the torque to be generated by the AC motor M1. The torque to be generated by AC motor M1 and reactor current IL (or LCRT) flowing through reactor 10 are proportional to each other as indicated by a straight line k4 shown in FIG.

As described above, in the electric vehicle equipped with motor drive device 200, accelerator opening degree ACC is always proportional to reactor current IL (or LCRT).

Therefore, the magnetic characteristic control means 301 uses the accelerator opening degree ACC in which the gap length LG of the core 110 (or 120) of the reactor 10 is input from the external ECU.
Core member 104 to adjust the gap length according to
(Or 126) to move the signal MVE (MV
One of E1 to MVE5) is generated and output to the moving means 11.

The accelerator opening ACC is the reactor current IL.
(Or LCRT), the gap length LG of the core 110 (or 120) of the reactor 10 is given by the following equation.

[0149]

[Equation 2]

Therefore, the magnetic characteristic control means 301 is
The gap length LG corresponding to the accelerator opening degree ACC input from the external ECU is calculated using the equation (2).

Further, since the equation (2) is expressed as a straight line k5 shown in FIG. 16, the magnetic characteristic control means 301 uses the straight line k5.
It is also possible to hold a map consisting of a combination of the gap length LG and the accelerator pedal position ACC existing on the upper side of the vehicle. Then, the magnetic characteristic control unit 301 extracts the gap length LG corresponding to the input accelerator opening degree ACC from the map, and the core 11 is adjusted to have the extracted gap length LG.
0 (or 120) core member 104 (or 126)
A signal MVE (one of MVE1 to MVE5) for moving the signal is generated and output to the moving means 11.

Referring to FIG. 17, motor drive device 200
A control method for controlling the gap length LG of the reactor 10 in FIG. When the operation of controlling the gap length LG starts, the magnetic characteristic control means 301 of the control device 210 receives the accelerator opening degree ACC from an external ECU and detects the operation mode of the electric vehicle in which the motor drive device 200 is mounted ( Step S10). The magnetic characteristic control unit 301 detects an operation mode such as an acceleration mode, a deceleration mode, and a cruise mode based on the input accelerator opening degree ACC. Then, the magnetic characteristic control means 301
Depending on the detected operating mode, the core 110 (or 1
The magnetic property of 20) is changed (step S20). That is, the magnetic characteristic control unit 301 extracts the gap length LG corresponding to the input accelerator opening degree ACC by the method described above, and the core member 104 of the core 110 (or 120) is adjusted so as to have the extracted gap length LG. (Or 126) to move the signal MVE (MVE1 to MVE1
(Any one of VE5) is generated and output to the moving means 11. In the subsequent operation, the gap length LG of the core 110 (or 120) is controlled to the gap length corresponding to the accelerator opening degree ACC according to the same operation as the operation described in the first embodiment.

The magnetic characteristic control means 301 receives the reactor current LCRT in addition to the accelerator opening degree ACC.
This is to confirm that there is a proportional relationship between CC and the reactor current LCRT.

As described above, the second embodiment is characterized in that the driving mode of the vehicle is detected and the gap length LG of the core 110 (or 120) is controlled according to the detected driving mode.

Further, the reactor 1 according to the second embodiment.
The control of the gap length LG of 0 is actually executed by the CPU, and the CPU reads the program including the steps of the flowchart shown in FIG. 17 from the ROM and executes the read program to execute the flowchart shown in FIG. The gap length LG of the reactor 10 is controlled according to.

Therefore, the ROM corresponds to a computer (CPU) readable recording medium in which a program including the steps of the flowchart shown in FIG. 17 is recorded.

Referring again to FIG. 13, the operation of motor drive device 200 will be described. Control device 210
The motor torque control means 31 of the input torque command value TR, the output voltage BV of the DC power supply B1, the motor current MC
A signal PWMI and a signal PWMC are generated based on RT, the inverter input voltage IVV, and the motor speed MRN, and the generated signal PWMI and signal PWMC are output to the inverter 14 and the boosting IPM 12, respectively, and the boosting IPM 12 is boosted. The operation of supplying the DC voltage to the inverter 14 and driving the AC motor M1 by the inverter 14 is as described in the first embodiment.

While the NPN transistor Q2 is on, the reactor current IL (or LCRT) flows through the coil 105 of the reactor 10 and the current sensor 13
Detects reactor current IL (or LCRT) and outputs it to control device 210. The magnetic characteristic control means 301 of the control device 210 calculates the gap length LG of the core 110 of the reactor 10 corresponding to the accelerator opening degree ACC input from the external ECU using the equation (2), and the calculated gap length. A signal MVE (one of MVE1 to MVE5) for moving the core member 104 to realize LG is generated and output to the voltage application circuit 112 of the moving means 11. In this case, preferably, the magnetic characteristic control means 3
01 is a gap length L corresponding to the accelerator opening ACC after confirming that a proportional relationship is established between the reactor voltage IL (or LCRT) and the accelerator opening ACC.
G is calculated to generate the signal MVE. Then, the voltage application circuit 112 receives the input signal MVE (MVE1 to MV).
A predetermined voltage based on one of E5)
11, the piezoelectric element 111 expands by a predetermined amount according to the applied voltage. Thereby, the core member 10
4 (or 126) is moved by a predetermined amount and the gap length LG
Is adjusted to a gap length corresponding to the detected accelerator opening degree ACC.

As described above, the operation mode of the electric vehicle is detected by detecting the accelerator opening degree ACC, and the gap length LG in the core 110 (or 120) of the reactor 10 is adjusted according to the detected operation mode. It

The motor drive device according to the second embodiment is shown in FIG.
The motor drive device 300 shown in FIG. FIG.
Referring to, motor drive device 300 is the same as motor drive device 100 except that control device 30 of motor drive device 100 is replaced with control device 310.

Motor drive device 300 is mounted on a hybrid electric vehicle and drives AC motor M1 which is one of the power sources of the hybrid electric vehicle. Then, the control device 310 controls the accelerator opening A indicating the degree of acceleration of the vehicle from the ECU provided outside the motor drive device 300.
CC and reactor current LCRT are received, the operating mode of the hybrid electric vehicle is detected based on the received accelerator opening ACC and reactor current LCRT, and core 110 (or 120) of reactor 10 is detected.
It has a function of adjusting the gap length LG.

Referring to FIG. 19, control device 310 includes a motor torque control means 31, a detection means 311, and a changing means 312. The motor torque control means 31 is as described in the first embodiment. The detection means 311 uses the accelerator opening degree ACC and the reactor current IL.
(Or LCRT), the operation mode of the hybrid electric vehicle equipped with the motor drive device 310 is detected depending on whether the accelerator opening ACC is proportional to the reactor current IL (or LCRT), and the detected operation mode is detected. To the changing means 312.

More specifically, the detection means 311 determines that the accelerator opening ACC is the reactor current IL (or LCR).
When it is proportional to T), the operation mode of the hybrid electric vehicle is detected as a high load operation mode in which the AC motor M1 is in a high load state. Further, the detection means 311 determines that the accelerator opening ACC is the reactor current IL (or LCRT).
Is not proportional to, the operation mode of the hybrid electric vehicle is detected to be a low load operation mode in which the AC motor M1 is in a low load state, and the reactor current IL (or LCR
T) or an AC motor M1 based on the torque command value TR
The operating state of is further detected.

In the case of a hybrid electric vehicle, since AC motor M1 and an engine (not shown) drive the drive wheels, accelerator opening ACC and AC motor M1
May be proportional to the torque to be generated or may not be proportional. That is, as shown by a point A1 on the straight line k4 shown in FIG. 20, the accelerator opening ACC is the reactor current I.
In some cases, it is proportional to L (or LCRT), or point A2
The accelerator opening ACC is the reactor current I
It may not be proportional to L (or LCRT).

As described above, when the vehicle on which the motor drive device 300 is mounted is a hybrid electric vehicle, the accelerator opening ACC is equal to the reactor current IL (or LCR).
There are cases where it is proportional to T) and cases where it is not. In the hybrid electric vehicle, the relationship between the accelerator opening degree ACC and the torque that the AC motor M1 should generate differs between the acceleration mode and the cruise mode. Acceleration is performed by the sum of the driving force transmitted from the engine to the driving wheels and the driving force transmitted from the AC motor M1 to the driving wheels. Therefore, in the acceleration mode, the accelerator opening degree ACC and the torque to be generated by the AC motor M1 are proportional. . Therefore, in the acceleration mode, the accelerator opening ACC is equal to the reactor current IL (or LCRT).
Proportional to.

On the other hand, in the cruise mode, the torque based on the accelerator opening degree ACC is distributed to the torque by the engine and the torque by the AC motor M1 so that the fuel economy of the hybrid electric vehicle is maximized. Therefore, in the cruise mode, the accelerator opening degree ACC and the torque generated by the AC motor M1 are not necessarily proportional to each other, and as a result, the accelerator opening degree ACC is equal to the reactor current IL (or LCR).
Not proportional to T).

As described above, in the hybrid electric vehicle, there are an operating mode in which the accelerator opening ACC and the reactor current IL (or LCRT) are proportional and an operating mode in which they are not proportional, so the accelerator opening ACC and the reactor current IL ( In order to accurately control the gap length LG of the core 110 (or 120) according to the driving mode of the hybrid electric vehicle in a driving mode that is not proportional to the LCRT), the gap length LG is controlled according to the driving state of the AC motor M1. There is a need to.

Therefore, the detecting means 311 determines that the input accelerator opening ACC corresponds to the reactor current IL (or LCR).
If it is proportional to T), it is detected that the engine is in the high load operation mode, and a signal EV for controlling the gap length LG of the core 110 (or 120) of the reactor 10 is generated and changed according to the accelerator opening ACC. Output to the means 312.
In the present invention, the "high load operation mode" means that the accelerator opening ACC is the reactor current IL (or LC).
RT) refers to the operating mode proportional to.

Further, the detecting means 311 determines that the input accelerator opening ACC corresponds to the reactor current IL (or LCR).
If it is not proportional to T), the low load operation mode is detected, and the core 110 is detected according to the operation state of the AC motor M1.
A signal HV for controlling the gap length LG of (or 120) is generated and output to the changing means 312. In the present invention, the "low load operation mode" refers to an operation mode in which accelerator opening ACC is not proportional to reactor current IL (or LCRT).

The changing means 312 includes a reactor current IL (or LCRT) from the current sensor 13 and an external EC.
The accelerator opening ACC from U and the signal EV (or HV) from the detection means 311 are received. Then, the changing unit 312, when receiving the signal EV from the detecting unit 311,
A signal M for moving the core member 104 (or 126) to adjust the gap length LG of the core 110 (or 120) to a gap length according to the accelerator opening degree ACC.
VE (any of MVE1 to MVE5) is generated and output to the moving means 11.

Further, the changing means 312 is the detecting means 311.
When the signal HV is received from the core 110 (or 12
Signal MVE (MVE1 to MVE1 to move core member 104 (or 126) in order to adjust the gap length LG of 0) to the gap length according to the operating state of AC motor M1.
MVE 5) and outputs it to the moving means 11. In this case, more specifically, the changing unit 312 sets the gap length LG of the core 110 (or 120) to the reactor current IL (or L) that represents the operating state of the AC motor M1.
Signal MVE for moving the core member 104 (or 126) to adjust the gap length according to CRT)
(One of MVE1 to MVE5) is generated and output to the moving means 11.

The accelerator opening ACC is the reactor current IL.
(Or LCRT), the above equation (2)
Therefore, when the signal EV is input from the detection unit 311, the change unit 312 calculates the gap length LG corresponding to the accelerator opening degree ACC input from the external ECU using Equation (2) and detects the gap length LG. When the signal HV is input from the means 311, the gap length LG corresponding to the reactor current IL (or LCRT) input from the current sensor 13 is calculated using the above equation (1).

As described above, since the equation (1) is represented by the straight line k1 shown in FIG. 9 and the equation (2) is represented by the straight line k5 shown in FIG. 16, the changing means 312 exists on the straight line k1. Gap length LG and reactor current IL (or L
A map A made up of a combination of CRT) and a map B made up of a combination of the gap length LG existing on the straight line k5 and the accelerator opening degree ACC are held. And change means 3
12 receives the signal EV from the detection means 311,
A signal MVE (MVE1) for extracting the gap length LG corresponding to the accelerator opening degree ACC from the map B and moving the core member 104 (or 126) of the core 110 (or 120) so that the extracted gap length LG becomes the extracted gap length LG. ~
MVE 5) and outputs it to the moving means 11. Further, when the signal HV is input from the detection unit 311, the changing unit 312 receives the reactor current IL (or LC).
RT) corresponding to the gap length LG is extracted from the map A, and the core 11 is adjusted so as to have the extracted gap length LG.
0 (or 120) core member 104 (or 126)
A signal MVE (one of MVE1 to MVE5) for moving the signal is generated and output to the moving means 11.

As described above, torque command value TR which is the target value of the torque to be generated by AC motor M1 and reactor current IL (or LCRT) flowing in reactor 10 are provided.
A proportional relationship is established between and the reactor current IL
(Or LCRT) and the gap length LG of the core 110 (or 120) also have a proportional relationship, and therefore the torque command value TR and the gap length LG also have a proportional relationship.

Therefore, the detecting means 311 determines the accelerator opening degree ACC and the reactor current IL (or LCR).
When it is detected that the operation mode of the hybrid electric vehicle is the low load operation mode based on T), the torque command value T is used instead of the reactor current IL (or LCRT).
The operating state of AC motor M1 may be detected based on R. In that case, when the changing unit 312 receives the signal HV from the detecting unit 311, the changing unit 312 controls the core member 104 (or 126) to control the gap length LG of the core 110 (or 120) to the gap length according to the designated torque value TR. A signal MVE (one of MVE1 to MVE5) for moving the signal is generated and output to the moving means 11.

When the proportional relationship is established between the torque command value TR and the gap length LG, the following equation is established between the torque command value TR and the gap length LG.

[0177]

[Equation 3]

Therefore, the detecting means 311 uses the equation (3)
Is used to calculate the gap length LG corresponding to the torque command value TR. Further, when the proportional relationship is established between torque command value TR and gap length LG, torque command value TR and gap length LG exist on straight line k6 shown in FIG. Therefore, the detection unit 311 may extract the gap length LG corresponding to the torque command value TR based on the map C formed by the combination of the torque command value TR and the gap length LG existing on the straight line k6. And change means 3
Reference numeral 12 extracts the gap length LG corresponding to the torque command value TR based on the map C formed by the formula (3) or the combination of the torque command value TR and the gap length LG.

As described above, when it is detected that the hybrid electric vehicle is in the low load operation mode,
The operating state of AC motor M1 is detected based on reactor current IL (or LCRT) or torque command value TR, and gap length LG of core 110 (or 120) is controlled according to the detected operating state of AC motor M1. To be done.

Referring to FIG. 22, motor drive device 300
A control method for controlling the gap length LG of the reactor 10 in FIG. This control method is generally performed according to the flowchart shown in FIG. FIG. 22
6 is a flowchart showing detailed operations of steps S10 and S20 when adjusting the gap length LG of the core 110 (or 120) according to the operation mode of the hybrid electric vehicle.

When the operation of adjusting the gap length LG is started, the current sensor 13 detects the reactor current IL (or LCRT) flowing in the reactor 10 and outputs it to the detecting means 311 and the changing means 312 of the control device 310 (step S11). ). Further, the external ECU detects the accelerator opening degree ACC to detect the detecting means 3 of the control device 310.
11 and the changing means 312 (step S1)
2). Then, the detection means 311 determines that the input accelerator opening degree ACC corresponds to the reactor current IL (or LCR).
It is detected whether it is proportional to T) (step S13).

In step S13, the accelerator opening A
When it is detected that the proportional relationship is established between CC and the reactor current IL (or LCRT), the detection means 3
11 detects that the hybrid electric vehicle is in the high load operation mode (step S14), generates the signal EV and outputs it to the changing means 312.

Then, the changing means 312 extracts the gap length LG corresponding to the accelerator opening degree ACC based on the received signal EV by the above-mentioned method, and the core 110 (or the core 110 (or the gap length LG is set to the extracted gap length LG). 12
The signal MVE (one of MVE1 to MVE5) for moving the core member 104 (or 126) of 0) is generated and output to the voltage application circuit 112 of the moving means 11.
Then, in the voltage application circuit 112, the switch S1
Is a terminal (terminals 1127 to 113) designated by the input signal MVE (one of MVE1 to MVE5).
1)), the voltage application circuit 112 applies a predetermined voltage to the piezo element 111. This allows
The piezo element 111 expands or contracts by a predetermined amount according to the applied voltage, and the core member 104 (or 126).
Moves in the x-axis direction by a predetermined amount. Thereby, the gap length LG is adjusted according to the accelerator opening degree ACC (step S21).

On the other hand, when it is detected in step S13 that the proportional relationship is not established between the accelerator opening degree ACC and the reactor current IL (or LCRT), the detecting means 311 determines that the hybrid electric vehicle is in the low load driving mode. Is detected (step S15), and the operating state of AC motor M1 is further detected (step S1).
6) Generate the signal HV and output it to the changing means 312.
In this case, detection unit 311 detects the operating state of AC motor M1 based on reactor current IL (or LCRT) or torque command value TR.

When the change means 312 receives the signal HV, the gap length LG corresponding to the operating state of the AC motor M1, that is, the gap length LG corresponding to the reactor current IL (or LCRT) or the torque command value TR is described above. And the core member 104 of the core 110 (or 120) so that the extracted gap length LG becomes
(Or 126) to move the signal MVE (MV
Any of E1 to MVE5) is generated and output to the voltage application circuit 112 of the moving means 11. Then, in the voltage application circuit 112, the switch S1 is operated by the input signal MV.
The voltage application circuit 112 is connected to a terminal (one of terminals 1127 to 1131) designated by E (one of MVE1 to MVE5), and the voltage application circuit 112 applies a predetermined voltage to the piezo element 1.
11 is applied. As a result, the piezoelectric element 111 expands or contracts by a predetermined amount according to the applied voltage, and the core member 104 (or 126) moves in the x-axis direction by a predetermined amount. As a result, the gap length LG is equal to the AC motor M.
It is adjusted according to the driving state of No. 1 (step S22).

Reactor 1 according to the second embodiment.
The control of the gap length LG of 0 is actually executed by the CPU, and the CPU reads the program including the steps of the flowcharts shown in FIGS. 17 and 22 from the ROM, executes the read program, and executes the read program. 22 and the flowchart shown in FIG. 22.
Control a gap length LG of 0.

Therefore, the ROM is shown in FIG. 17 and FIG.
It corresponds to a computer (CPU) readable recording medium that records a program including the steps of the flowchart shown in FIG.

Referring again to FIG. 18, the operation of motor drive device 300 will be described. Controller 310
The motor torque control means 31 of the input torque command value TR, the output voltage BV of the DC power supply B1, the motor current MC
A signal PWMI and a signal PWMC are generated based on RT, the inverter input voltage IVV, and the motor speed MRN, and the generated signal PWMI and signal PWMC are output to the inverter 14 and the boosting IPM 12, respectively, and the boosting IPM 12 is boosted. The operation of supplying the DC voltage to the inverter 14 and driving the AC motor M1 by the inverter 14 is as described in the first embodiment.

While the NPN transistor Q2 is on, the reactor current IL (or LCRT) flows through the coil 105 of the reactor 10 and the current sensor 13
Detects reactor current IL (or LCRT) and outputs it to control device 310. The detection means 311 of the control device 310 receives the input reactor current IL (or LC).
RT) and the accelerator opening degree ACC, the operating mode of the hybrid electric vehicle is detected as described above, and when the operating mode of the hybrid electric vehicle is the high load operating mode, a signal EV is generated and the change means 312 is provided. Output. In addition, the detection unit 311 further determines when the operation mode of the hybrid electric vehicle is the low load operation mode,
The operating state of AC motor M1 is detected, signal HV is generated and output to changing means 312.

Then, when the changing means 312 receives the signal EV, the reactor 10 corresponding to the accelerator opening degree ACC.
The gap length LG of the core 110 (or 120) is calculated using equation (2), and the signal MVE (MVE1 to MVE1 to move the core member 104 (or 126) to realize the calculated gap length LG is calculated. MVE5) is generated and output to the voltage application circuit 112 of the moving means 11. The subsequent operation is as described above.

On the other hand, when the changing means 312 receives the signal HV, the core 110 of the reactor 10 corresponding to the reactor current IL (or LCRT) or the torque command value TR.
The gap length LG of (or 120) is calculated using the formula (2) or the formula (3), and the calculated gap length LG
In order to realize the above, a signal MVE (one of MVE1 to MVE5) for moving the core member 104 (or 126) is generated and output to the voltage application circuit 112 of the moving means 11. The subsequent operation is as described above.

In this way, the operation mode of the hybrid electric vehicle is detected based on accelerator opening ACC, and gap length LG in core 110 of reactor 10 is adjusted according to the detected operation mode.

Others are the same as those in the first embodiment. In a hybrid electric vehicle, there are various other well-known methods for arranging a motor and an engine and how to extract the output of both as a driving force (for example, a series hybrid system, a parallel system). The present invention can be applied to any type such as a hybrid system, a series-parallel hybrid system, or a combination of a CVT and an automatic transmission as a transmission mechanism.

[Third Embodiment] Referring to FIG. 23, a motor drive device 400 according to a third embodiment of the present invention replaces reactor 10 of motor drive device 100 with reactor 10A.
The control device 30 is replaced with the control device 410, and the rest is the same as the motor drive device 100.

Controller 410 has a function of controlling reactor 10A so as to reduce noise in reactor 10A, in addition to the function of controller 30.

Referring to FIG. 24, control device 410 includes a motor torque control means 31, a changing means 32, and a voltage applying means 33. The motor torque control means 31 and the changing means 32 are as described in the first embodiment.

The voltage applying means 33 receives the reactor current LCRT from the current sensor 13. Then, voltage application unit 33 generates voltage VG having the same phase as the current waveform of reactor current LCRT, and outputs the generated voltage VG to reactor 10A.

Referring to FIG. 25, reactor 10A is
The core 130, the coil 133, and the piezoelectric elements 134 and 13
Including 5 and. The core 130 includes core members 131 and 132. Each of core members 131 and 132 has a laminated structure similar to core members 101 to 104 in the first embodiment. The core members 131 and 132 are arranged in a substantially annular shape. The piezoelectric elements 134 and 135 are arranged between the core member 131 and the core member 132. That is, in the piezoelectric elements 134 and 135, the core member 131 and the core member 13 are formed so as to form a gap in a part of the core 130.
It is arranged between the two. Further, the core member 131 is moved in the x-axis direction by the moving means 11 described in the first embodiment.

The coil 133 is wound around the core 130. The coil 133 is wound so that the magnetic flux travels along the circumference of the core 130 when a direct current flows.

The piezoelectric element 134 is composed of a piezoelectric body 136 and electrodes 137 and 138. The piezoelectric body 136 has a core 130 so as to contact the core member 131 and the core member 132.
Inserted in the gap. Then, the electrodes 137 and 138
Are formed on both ends of the piezoelectric body 136 in the y-axis direction (perpendicular to the x-axis direction. The same applies hereinafter).

The piezoelectric element 135 comprises a piezoelectric body 139 and electrodes 140 and 141. The piezoelectric body 139 contacts the core member 131 and the core member 132 so as to contact the core 130.
Inserted in the gap. Then, the electrodes 140 and 141
Are formed on both ends of the piezoelectric body 139 in the y-axis direction. The electrodes 137 and 140 are connected to the terminal TE1. The electrodes 138 and 141 are connected to the terminal TE2.
Then, the voltage applying means 33 applies the voltage VG between the terminals TE1 and TE2.

When the voltage VG is applied between the terminals TE1 and TE2, the voltage VG is applied between the electrodes 137 and 138 in the piezoelectric element 134, and the electrodes 140 and 141 in the piezoelectric element 135.
A voltage VG is applied between and. Then, the piezoelectric body 1
36 and 139 expand and contract in the x-axis direction (that is, the circumferential direction of the core 130) according to the voltage VG.

Reduction of noise in reactor 10A will be described with reference to FIG. The reactor current LCRT flowing through the reactor 10A has a triangular waveform in which ripple components are superimposed and which changes periodically. Then,
Core 130 by the ripple component of reactor current LCRT
The magnetic flux inside changes, and the attraction force FRCI generated between the core member 131 and the core member 132 changes in synchronization with the ripple component. As a result, the core member 131 and the core member 13
The length of the gap material existing between 2 and 2, that is, the gap length LG1 becomes shorter as the suction force FRCI becomes stronger, and becomes longer as the suction force FRCI becomes weaker. That is, the gap member periodically expands and contracts in a phase opposite to the suction force FRCI.

When the gap member expands and contracts periodically, the core 1
Rigid body vibration of 30 is induced and noise is generated.

Therefore, in the third embodiment, the piezoelectric bodies 136 and 139 inserted between the core members 131 and 132 are in phase with the current waveform of the reactor current LCRT in the x-axis direction, that is, the core. By expanding and contracting in the circumferential direction of the core 130, rigid body vibration of the core 130 is less likely to occur and noise is reduced. The details will be described below.

The voltage applying means 33 has a reactor current LC.
Based on RT, voltage VG having the same phase as the current waveform of reactor current LCRT is generated, and the generated voltage VG is applied between terminals TE1 and TE2 of reactor 10A.

Then, the voltage VG changes to the electrodes 137, 13
8 and between the electrodes 140 and 141, the piezoelectric body 1
36 and 139 expand and contract in the x-axis direction. That is, in the piezoelectric bodies 136 and 139, the thickness THN in the x-axis direction increases when the voltage level of the voltage VG increases, and the thickness THN in the x-axis direction decreases when the voltage level of the voltage VG decreases. Piezoelectric body 13
Increasing the thickness THN of the 6,139 in the x-axis direction means that
This means that the repulsive force FRCG applied to the core members 131 and 132 by the piezoelectric bodies 136 and 139 against the suction force FRCI becomes stronger, and the thickness T of the piezoelectric bodies 136 and 139 in the x-axis direction is T.
The decrease in HN means that the repulsive force FRCG applied to the core members 131 and 132 by the piezoelectric bodies 136 and 139 against the suction force FRCI becomes weak. Therefore, the repulsive force FRCG applied to the core members 131 and 132 by the piezoelectric bodies 136 and 139 periodically changes in a phase opposite to the attraction force FRCI, and when the voltage VG is applied to the piezoelectric elements 134 and 135, the piezoelectric bodies 136 and 136 are released. The length of 139 in the x-axis direction, that is, the gap length LG2, is determined by the attraction force FRCI and the repulsion force FR.
The piezoelectric elements 134, 13 are determined by the resultant force with the CG.
As compared with the case where the voltage VG is not applied to 5, the periodic fluctuation amount is reduced. As a result, the piezoelectric elements 134 and 135
Rigid body vibration of the core 130 is less likely to occur and noise is reduced as compared with the case where the voltage VG is not applied to the core 130.

Referring to FIG. 27, the operation of adjusting the gap length of reactor 10A according to the third embodiment will be described. When the operation starts, the steps S1 and S2 described in the first embodiment are executed, and the reactor 1
The gap length LG2 of 0A is adjusted according to the operating state of AC motor M1.

The piezoelectric members 136 and 139 are made of ceramics, but the core member 131 moves in the x-axis direction to expand and contract in the x-axis direction, so that the x-axis of the piezoelectric members 136 and 139 is reduced.
The axial thickness, that is, the gap length LG2 is adjusted according to the operating state of AC motor M1.

After step S2, the periodic fluctuation of the gap is reduced (step S3). That is, the voltage applying means 33 is the reactor LC from the current sensor 13.
A voltage VG having the same phase as the current waveform of the reactor current LCRT is generated based on RT, and the generated voltage VG is used for the terminals TE1 and TE2 of the reactor 10A.
Applied between and. Then, the piezoelectric bodies 136, 139
Expands and contracts in the x-axis direction in synchronization with the voltage VG, and the gap length
The periodic fluctuation of G2 is reduced.

As described above, the control method for adjusting the gap length of reactor 10A according to the third embodiment adjusts gap length LG2 of reactor 10A according to the operating state of AC motor M1, and adjusts the adjusted gap length LG2. This is a control method for reducing the periodic fluctuation of the.

Further, the reactor 1 in the third embodiment.
The control of the gap length of 0 A is actually executed by the CPU, and the CPU reads the program including the steps of the flowchart shown in FIG. 27 from the ROM, executes the read program, and follows the flowchart shown in FIG. The gap length of the reactor 10A is controlled.

Therefore, the ROM corresponds to a computer (CPU) readable recording medium in which a program including the steps of the flowchart shown in FIG. 27 is recorded.

Referring again to FIG. 23, the motor drive device 4
The overall operation of 00 will be described. The controller 410
Input torque command value TR, output voltage BV of DC power supply B1, motor current MCRT, inverter input voltage IVV
The signal PWMI, the signal PWMC and the signal MVE are generated based on the motor rotation speed MRN and the inverter 14
Operates AC motor M1 and further control device 410 adjusts gap length LG2 of reactor 10A based on reactor current LCRT.
As described in.

After that, the voltage applying means 33 generates the voltage VG having the same phase as the current waveform of the reactor current LCRT and outputs it to the reactor 10A, and the voltage VG is applied between the electrode 137 and the electrode 138 and between the electrode 140 and the electrode 138. And 141. Then, the piezoelectric bodies 136 and 139 have a voltage V
Noise in the reactor 10A is reduced by expanding and contracting in the x-axis direction in synchronization with G.

Thus, the operating state of AC motor M1 is detected by detecting reactor current LCRT flowing through reactor 10A, and core 13 of reactor 10A is detected.
The gap length LG2 at 0 is adjusted according to the detected operating state of AC motor M1. Then, by expanding and contracting the piezoelectric bodies 136 and 139 in the x-axis direction in synchronization with the voltage VG having the same phase as the current waveform of the reactor current LCRT, noise in the reactor 10A is reduced.

Incidentally, the voltage sensor 13 and the voltage applying means 3
3. The piezoelectric elements 134 and 135 compose "variation reducing means".

Further, in the above description, the piezoelectric element is inserted into the two gaps of the core 130, but
In the present invention, the present invention is not limited to this, and the piezoelectric element may be inserted into one of the two gaps, and a voltage having the same phase as the current waveform of the reactor current may be applied to the inserted piezoelectric element. Further, the core of the reactor generally includes a plurality of gaps, and a piezoelectric element is inserted into at least one of the plurality of gaps, and the inserted piezoelectric element has the same phase as the current waveform of the reactor current. A voltage may be applied.

Others are the same as those in the first embodiment. [Fourth Embodiment] Referring to FIG. 28, a motor drive device 500 according to a fourth embodiment of the present invention replaces reactor 10 of motor drive device 200 with reactor 10A and replaces control device 21.
0 is replaced with the control device 510, and the rest is the same as the motor drive device 200.

As for reactor 10A, the third embodiment is described.
As described in. Control device 510 has the function of reducing the noise of the reactor described in the third embodiment in addition to the function of control device 210. Therefore, the controller 510 controls the signals PWMI, PWMC, M.
In addition to VE, voltage VG is generated and output to reactor 10A.

Referring to FIG. 29, control device 510 includes motor torque control means 31 and magnetic characteristic control means 301.
And voltage applying means 33. The motor torque control means 31 is as described in the first embodiment. The magnetic characteristic control means 301 is the second embodiment.
As described in. The voltage applying means 33 is as described in the third embodiment.

FIG. 30 shows a flowchart showing a control method for adjusting the gap of reactor 10A according to the fourth embodiment. The flowchart shown in FIG. 30 is obtained by adding step S30 for performing the same operation as step S3 of the flowchart shown in FIG. 27 to the flowchart shown in FIG.

That is, the core 130 of the reactor 10A.
After the magnetic characteristics of is changed according to the driving mode of the vehicle,
The periodic fluctuation of the gap of the core 130 is reduced.

Reactor 1 according to the fourth embodiment.
The 0A gap length control is actually executed by the CPU, and the CPU reads a program including the steps of the flowchart shown in FIG. 30 from the ROM, executes the read program, and follows the flowchart shown in FIG. The gap length of the reactor 10A is controlled.

Therefore, the ROM corresponds to a computer (CPU) readable recording medium in which a program including the steps of the flowchart shown in FIG. 30 is recorded.

Referring again to FIG. 28, the overall operation of motor drive device 500 will be described. Control device 5
10 is a signal PW based on the input torque command value TR, the output voltage BV of the DC power supply B1, the motor current MCRT, the inverter input voltage IVV, and the motor speed MRN.
MI, signal PWMC and signal MVE are generated, inverter 14 drives AC motor M1, and control device 510 further controls accelerator opening degree ACC and reactor current LC.
The operation until the gap length LG2 of reactor 10A is adjusted based on RT is as described in the second embodiment.

After that, the voltage applying means 33 generates the voltage VG having the same phase as the current waveform of the reactor current LCRT and outputs it to the reactor 10A, and the voltage VG is applied between the electrode 137 and the electrode 138 and between the electrode 140 and the electrode 138. And 141. Then, the piezoelectric bodies 136 and 139 have a voltage V
Noise in the reactor 10A is reduced by expanding and contracting in the x-axis direction in synchronization with G.

Thus, the operating mode of the electric vehicle is detected by detecting the accelerator opening degree ACC, and the gap length LG2 in the core 130 of the reactor 10A is
It is adjusted according to the detected operation mode. Then, by expanding and contracting the piezoelectric bodies 136 and 139 in the x-axis direction in synchronization with the voltage VG having the same phase as the current waveform of the reactor current LCRT, noise in the reactor 10A is reduced.

The motor drive device according to the fourth embodiment may be motor drive device 600 shown in FIG. Figure 3
1, the motor drive device 600 replaces the reactor 10 of the motor drive device 300 with the reactor 10A,
The controller 310 is replaced with the controller 610,
Others are the same as the motor drive device 300.

Control device 610 has the function of reducing the noise of the reactor described in the third embodiment in addition to the function of control device 310. Therefore, the controller 61
0 is the voltage V in addition to the signals PWMI, PWMC, and MVE.
G is generated and output to the reactor 10A.

Referring to FIG. 32, control device 610 includes a motor torque control means 31, a detecting means 311, a changing means 312 and a voltage applying means 33. The motor torque control means 31 is as described in the first embodiment. The detecting means 311 and the changing means 312 are as described in the second embodiment.
The voltage applying means 33 is as described in the third embodiment.

The control method for adjusting the gap of reactor 10A in motor drive device 600 is performed according to the flowchart shown in FIG. 30 and the flowchart shown in FIG. 22 showing the detailed operation of step S10 of the flowchart shown in FIG.

That is, the core 130 of the reactor 10A.
After the magnetic characteristics of is changed according to the driving mode of the vehicle,
The periodic fluctuation of the gap of the core 130 is reduced.

Reactor 1 according to the fourth embodiment.
The control of the gap length of 0 A is actually executed by the CPU, and the CPU reads a program including the steps of the flowcharts shown in FIGS. 22 and 30 from the ROM, executes the read program, and executes the read program. Reactor 10 according to the flowchart shown in FIG.
Control the gap length of A.

Therefore, the ROM is the same as that shown in FIGS.
It corresponds to a computer (CPU) readable recording medium that records a program including the steps of the flowchart shown in FIG.

As described above, according to the control method for adjusting the gap length of reactor 10A according to the fourth embodiment, the gap length LG of reactor 10A is adjusted according to the driving state of the vehicle.
2 and adjust the adjusted gap length LG2
This is a control method for reducing the periodic fluctuation of the.

Referring again to FIG. 31, the overall operation of motor drive device 600 will be described. Control device 6
10 is a signal PW based on the input torque command value TR, the output voltage BV of the DC power supply B1, the motor current MCRT, the inverter input voltage IVV, and the motor speed MRN.
MI, signal PWMC and signal MVE are generated, inverter 14 drives AC motor M1, and control device 510 further controls accelerator opening degree ACC and reactor current LC.
The operation until the gap length LG2 of reactor 10A is adjusted based on RT is as described in the second embodiment.

After that, the voltage applying means 33 generates the voltage VG having the same phase as the current waveform of the reactor current LCRT and outputs it to the reactor 10A, and the voltage VG is applied between the electrodes 137 and 138 and between the electrodes 140 and 138. And 141. Then, the piezoelectric bodies 136 and 139 have a voltage V
Noise in the reactor 10A is reduced by expanding and contracting in the x-axis direction in synchronization with G.

As described above, the operation mode of the electric vehicle is detected by detecting the accelerator opening degree ACC, and the gap length LG2 in the core 130 of the reactor 10A is
It is adjusted according to the detected operation mode. Then, by expanding and contracting the piezoelectric bodies 136 and 139 in the x-axis direction in synchronization with the voltage VG having the same phase as the current waveform of the reactor current LCRT, noise in the reactor 10A is reduced.

Others are the same as those in the first to third embodiments. Needless to say, the present invention can be applied to various hybrid vehicles or electric vehicles in addition to the contents described in the above embodiments. For example, a plurality of inverters and motors may be connected in parallel to the capacitor C1 and each motor (or motor generator) may be driven independently.
In this case, one motor may be used for driving the rear wheels and another motor may be used for driving the front wheels. A hybrid vehicle using a planetary gear mechanism has one motor generator connected to the sun gear of the planetary gear mechanism, the engine connected to the carrier of the planetary gear mechanism, and the other motor generator connected to the ring gear. However, the present invention is also applicable to such a hybrid vehicle.

The embodiments disclosed this time are to be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the claims, and is intended to include meanings equivalent to the claims and all modifications within the scope.

[Brief description of drawings]

FIG. 1 is a schematic block diagram of a motor drive device according to a first embodiment of the present invention.

FIG. 2 is a functional block diagram of the control device shown in FIG.

FIG. 3 is a functional block diagram for explaining the function of the motor torque control means shown in FIG.

FIG. 4 is a perspective view of a drive unit that houses the reactor shown in FIG. 1, a boosting IPM, an inverter, a capacitor, and a control device.

5 is a perspective view of the reactor shown in FIG. 1. FIG.

6 is a diagram for explaining a method of changing the gap length LG of the reactor shown in FIG.

7 is a circuit diagram of the voltage application circuit shown in FIG.

8 is a diagram showing the relationship between the modified values LG1, LG3, LG5 of the gap length LG of the reactor shown in FIG. 5 and the position of the end surface of the core member 104.

FIG. 9 is a relationship diagram between a gap length and a reactor current.

FIG. 10 is a flowchart for explaining a gap length control method according to the first embodiment.

11 is another perspective view of the reactor shown in FIG. 1. FIG.

FIG. 12 is a diagram showing the relationship between the reactor inductance and the reactor current.

FIG. 13 is a schematic block diagram of a motor drive device according to a second embodiment.

14 is a functional block diagram of the control device shown in FIG.

FIG. 15 is a relationship diagram between an accelerator opening and a reactor current.

FIG. 16 is a relationship diagram between a gap length and an accelerator opening.

FIG. 17 is a flowchart for explaining a gap length control method according to the second embodiment.

FIG. 18 is another schematic block diagram of the motor drive device according to the second embodiment.

FIG. 19 is a functional block diagram of the control device shown in FIG. 18.

FIG. 20 is a relationship diagram between the accelerator opening and the reactor current.

FIG. 21 is a relationship diagram between a gap length and a torque command value.

FIG. 22 is another flowchart for explaining the gap length control method according to the second embodiment.

FIG. 23 is a schematic block diagram of a motor drive device according to a third embodiment.

FIG. 24 is a functional block diagram of the control device shown in FIG. 23.

25 is a plan view of the reactor shown in FIG. 23. FIG.

FIG. 26 is a timing chart of the reactor current, the attraction force, the gap, and the thickness of the piezoelectric body for explaining the operation of reducing the noise in the motor drive device according to the third embodiment.

FIG. 27 is a flowchart for explaining a gap length control method according to the third embodiment.

FIG. 28 is a schematic block diagram of a motor drive device according to a fourth embodiment.

FIG. 29 is a functional block diagram of the control device shown in FIG. 28.

FIG. 30 is a flowchart for explaining a gap length control method according to the fourth embodiment.

FIG. 31 is another schematic block diagram of the motor drive device according to the fourth embodiment.

32 is a functional block diagram of the control device shown in FIG. 31. FIG.

FIG. 33 is a relationship diagram between the inductance and the reactor current in the conventional reactor.

[Explanation of symbols]

10, 10A reactor, 11 moving means, 12 boosting IPM, 13, 24 current sensor, 14 inverter, 20, 22 voltage sensor, 30, 210, 31
0,410,510,610 control device, 31 motor torque control means, 32,312 change means, 33 voltage application means, 40 motor control phase voltage calculation section, 42 inverter PWM signal conversion section, 50 inverter input voltage command calculation Section, 52 boosting IPM duty ratio calculating section, 54 boosting IPM PWM signal converting section, 60
Drive unit, 100, 200, 300, 400, 50
0,600 motor drive device, 101-104, 121
~ 126, 131, 132 core member, 101A, 102
A, 103A, 104A, 121A, 122A, 123
A, 124A, 125A, 126A One end, 101
B, 102B, 103B, 104B, 121B, 122
B, 123B, 124B, 125B, 126B Other end, 105, 133 coil, 110, 120, 130
Core, 111 piezo element, 112 voltage application circuit, 1
34,135 piezoelectric element, 136,139 piezoelectric body, 1
37, 138, 140, 141 electrodes, 301 magnetic characteristic control means, 311 detection means, 1011 to 101n,
1021 to 102n, 1031 to 103n, 1041
104n, 1211 to 121n, 1221 to 122n,
1231 to 123n, 1241 to 124n, 1251
125n, 1261-126n steel plate, 1121-11
24 resistance, 1125 power supply node, 1126 ground node, 1127 to 1131 terminals, B1 DC power supply, C1
Capacitor, L1, L2, LG Gap length, M1
AC motor, Q1-Q8 NPN transistor, D1-
D8 diode, N1 to N5 nodes, S1 switch, TE1 and TE2 terminals.

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 5H115 PA05 PA11 PC06 PG04 PI16                       PI29 PO06 PU08 PV09 PV24                       QE08 QN03 QN09 RB22 SE10                       TO12 TO13 TO21 UI33                 5H576 AA15 BB02 BB04 CC04 DD02                       DD04 EE11 GG04 HA04 HB02                       JJ03 LL22 LL24                 5H730 AA14 AA19 AS04 AS13 BB14                       BB57 BB91 BB94 CC28 DD03                       DD26 EE59 FD01 FD11 FG05                       ZZ17

Claims (57)

[Claims] 1. A motor drive device for driving a motor by an inverter, comprising: a reactor for generating an input voltage to be supplied to the inverter; detection means for detecting an operating state of the motor; and the detected operation. A motor drive device comprising: a changing unit that changes a magnetic characteristic of a core that constitutes the reactor according to a state. 2. The reactor includes a core composed of a plurality of core members, and the changing unit changes the magnetic characteristic by changing a gap length between the core members according to the operating state. Item 2. The motor drive device according to Item 1. 3. The motor drive device according to claim 2, wherein the changing unit changes the gap length by moving the core member using a piezoelectric element. 4. The motor drive device according to claim 1, wherein the detection unit detects an operating state of the motor by detecting a reactor current flowing in the reactor. 5. The method according to claim 1, wherein the detecting means detects an operating state of the motor based on a torque command value which is a target value of torque to be generated by the motor. The described motor drive device. 6. The motor drive device according to claim 1, further comprising a variation reducing unit that reduces a periodic variation of the gap between the cores. 7. The motor drive device according to claim 6, wherein the fluctuation reducing unit applies a periodic fluctuation having a phase opposite to that of the periodic fluctuation of the gap to the gap. 8. The variation reducing means has the same phase as a current waveform of a reactor current flowing in the reactor and the piezoelectric body provided in the gap, and the piezoelectric body is arranged in a circumferential direction of the core. The motor drive device according to claim 7, further comprising a voltage applying unit that applies a voltage for expanding and contracting to the piezoelectric body. 9. A motor drive device for driving a motor for driving a vehicle by an inverter, comprising: a reactor for generating an input voltage to be supplied to the inverter; a detection means for detecting an operation mode of the vehicle; And a changing unit that changes the magnetic characteristics of the core forming the reactor according to the selected operation mode. 10. The motor drive device according to claim 9, wherein the detection means detects the operation mode based on an accelerator opening degree. 11. The reactor includes a core including a plurality of core members, and the changing unit changes the magnetic characteristic by changing a gap length between the core members according to the operation mode. The motor drive device according to claim 9 or 10. 12. The motor drive device according to claim 11, wherein the changing unit changes the gap length by moving the core member using a piezoelectric element. 13. The motor drive device according to claim 11, wherein the changing unit changes the gap length according to the accelerator opening degree. 14. The changing means holds a combination of the accelerator opening and the gap length as a map, detects a gap length corresponding to the accelerator opening from the map, and detects the detected gap length. The motor drive device according to claim 13, wherein the gap length between the core members is changed so that 15. The motor drive device according to claim 9, wherein the detection unit detects the operation mode in accordance with a relationship between a reactor current flowing through the reactor and the accelerator opening. 16. The reactor includes a core including a plurality of core members, and the changing unit changes the magnetic characteristic by changing a gap length between the core members according to the operation mode. Item 16. The motor drive device according to Item 15. 17. The motor drive device according to claim 16, wherein the changing unit changes the gap length by moving the core member using a piezoelectric element. 18. The detection means detects that the operation mode is a high load operation mode for driving the motor in a high load state when there is a proportional relationship between the accelerator opening and the reactor current. When the accelerator opening and the reactor current have no proportional relationship, the operation mode is a low load operation mode for driving the motor in a low load state, and the operation state of the motor is further detected. However, the changing means changes the gap length according to the accelerator opening when the high load operation mode is detected, and according to the detected operation state when the low load operation mode is detected. The motor drive device according to claim 16 or 17, wherein the gap length is changed. 19. The detecting unit detects an operating state of the motor based on the reactor current, and the changing unit determines the gap length according to the reactor current when the low load operating mode is detected. The motor drive device according to claim 18, which is modified. 20. The changing means holds a first map formed of a combination of the accelerator opening degree and the gap length, and a second map formed of a combination of the reactor current and the gap length, When the high load operation mode is detected, the gap length corresponding to the accelerator opening is extracted from the first map, and the gap length between the core members is changed to be the extracted gap length, 20. When a low load operation mode is detected, a gap length corresponding to the reactor current is extracted from the second map, and the gap length between the core members is changed so as to be the extracted gap length. The motor drive device described in 1. 21. The detecting means detects an operating state of the motor based on a torque command value which is a target value of torque to be generated by the motor, and the changing means detects the low load operating mode. Then, the gap length is changed according to the torque command value,
The motor drive device according to claim 18. 22. The changing means holds a first map made up of a combination of the accelerator opening degree and the gap length and a second map made up of a combination of the torque command value and the gap length. When the high load operation mode is detected, the gap length corresponding to the accelerator opening is extracted from the first map, and the gap length between the core members is changed to be the extracted gap length, When the low load operation mode is detected, the gap length corresponding to the torque command value is extracted from the second map, and the gap length between the core members is changed so as to be the extracted gap length. Item 22. The motor drive device according to Item 21. 23. The motor drive device according to claim 9, further comprising a variation reducing unit configured to reduce a periodic variation of the gap between the cores. 24. The motor drive device according to claim 23, wherein the fluctuation reducing unit applies a periodic fluctuation of an opposite phase to the periodic fluctuation of the gap to the gap. 25. The variation reducing means has the same phase as a current waveform of a reactor current flowing in the reactor and the piezoelectric body provided in the gap, and the piezoelectric body is arranged in a circumferential direction of the core. The motor drive device according to claim 24, further comprising a voltage applying unit that applies a voltage for expanding and contracting to the piezoelectric body. 26. A control method for controlling a magnetic characteristic of a core forming a reactor for generating an input voltage supplied to an inverter for driving a motor, comprising a first step of detecting an operating state of the motor. A second step of changing the magnetic characteristic according to the detected operating state. 27. The core of the reactor is composed of a plurality of core members, and in the second step, the magnetic characteristic is changed by changing a gap length between the core members according to the operating condition. The control method according to claim 26. 28. The operating state of the motor is detected by detecting a reactor current flowing through the reactor in the first step.
The control method described in. 29. In the first step, the operating state of the motor is detected based on a torque command value which is a target value of torque to be generated by the motor.
The control method according to claim 6 or 27. 30. The control method according to claim 26, further comprising a third step of reducing a periodic fluctuation amount of the gap of the core. 31. The core includes a piezoelectric body provided in the gap, and the third step includes first detecting a reactor current flowing in the reactor.
And a second sub-step of generating a voltage that is in phase with the detected current waveform of the reactor current and that expands and contracts the piezoelectric body in the circumferential direction of the core, and the generated voltage. The control method according to claim 30, further comprising a third sub-step of applying to the piezoelectric body. 32. A control method for controlling a magnetic characteristic of a core forming a reactor for generating an input voltage supplied to an inverter for driving a vehicle driving motor, the first method detecting a driving mode of a vehicle. And a second step of changing the magnetic characteristic according to the detected operation mode. 33. In the first step, the operation mode is issued based on an accelerator opening degree.
2. The control method described in 2. 34. The core of the reactor is composed of a plurality of core members, and in the second step, the magnetic characteristic is changed by changing a gap length between the core members according to the accelerator opening degree. 34. The control method according to claim 33. 35. The control method according to claim 32, wherein, in the first step, the operation mode is detected according to a relationship between a reactor current flowing through the reactor and an accelerator opening. 36. The core of the reactor is composed of a plurality of core members, and in the second step, the magnetic characteristics are changed by changing a gap length between the core members according to the operation mode. The control method according to claim 35. 37. In the first step, when the accelerator opening and the reactor current have a proportional relationship, the operation mode is detected as a high load operation mode for driving the motor in a high load state. When there is no proportional relationship between the accelerator opening and the reactor current, the operation mode is detected as a low load operation mode for driving the motor in a low load state, and the operation state of the motor is further detected. When the high load operation mode is detected, the gap length is changed according to the accelerator opening degree in the second step, and when the low load operation mode is detected, in the second step. 37. The control method according to claim 36, wherein the gap length is changed according to an operating state of the motor. 38. In the first step, the operating state of the motor is detected based on the reactor current, and when the low load operation mode is detected, the operating state of the motor is detected according to the reactor current in the second step. The control method according to claim 37, wherein the gap length is changed. 39. In the first step, the operating state of the motor is detected based on a torque command value that is a target value of torque to be generated by the motor, and when the low load operating mode is detected, The control method according to claim 37, wherein the gap length is changed in accordance with the torque command value in the second step. 40. The control method according to claim 32, further comprising a third step of reducing a periodic fluctuation amount of the gap of the core. 41. The core includes a piezoelectric body provided in the gap, and the third step includes first detecting a reactor current flowing in the reactor.
And a second sub-step of generating a voltage that is in phase with the detected current waveform of the reactor current and that expands and contracts the piezoelectric body in the circumferential direction of the core, and the generated voltage. The control method according to claim 40, further comprising a third sub-step of applying to the piezoelectric body. 42. A computer-readable recording medium in which a program for causing a computer to control magnetic characteristics of a core forming a reactor for generating an input voltage to be supplied to an inverter for driving a motor is recorded. A computer-readable recording medium recording a program for causing a computer to execute a first step of detecting an operating state of a motor and a second step of changing the magnetic characteristic according to the detected operating state. 43. The core of the reactor is composed of a plurality of core members, and in the second step, the magnetic characteristic is changed by changing a gap length between the core members according to the operating state. A computer-readable recording medium recording the program to be executed by the computer according to claim 42. 44. The operating state of the motor is detected by detecting a reactor current flowing through the reactor in the first step.
A computer-readable recording medium recording the program to be executed by the computer according to. 45. In the first step, the operating state of the motor is detected based on a torque command value that is a target value of torque to be generated by the motor.
A computer-readable recording medium in which the program to be executed by the computer according to claim 2 or claim 43 is recorded. 46. The computer-readable recording medium recording the program to be executed by the computer according to claim 42, further comprising a third step of reducing a periodic variation of the gap between the cores. 47. The core includes a piezoelectric body provided in the gap, and the third step includes first detecting a reactor current flowing in the reactor.
And a second sub-step of generating a voltage that is in phase with the detected current waveform of the reactor current and that expands and contracts the piezoelectric body in the circumferential direction of the core, and the generated voltage. The computer-readable recording medium recording the program to be executed by the computer according to claim 46, including a third sub-step of applying to the piezoelectric body. 48. A computer-readable recording medium in which a program for causing a computer to control magnetic characteristics of a core constituting a reactor for generating an input voltage to be supplied to an inverter for driving a motor for driving a vehicle is recorded. And a computer-readable record recording a program for causing a computer to execute a first step of detecting a driving mode of a vehicle and a second step of changing the magnetic characteristic according to the detected driving mode. Medium. 49. The computer-readable recording medium recording the program to be executed by the computer according to claim 48, wherein the operation mode is detected based on an accelerator opening degree in the first step. 50. The core of the reactor is composed of a plurality of core members, and in the second step, the magnetic characteristic is changed by changing a gap length between the core members according to the accelerator opening degree. 50. A computer-readable recording medium recording the program to be executed by the computer according to claim 49. 51. A program executed by a computer according to claim 48, wherein in the first step, the operation mode is detected in accordance with a relationship between a reactor current flowing through the reactor and an accelerator opening. Computer-readable recording medium. 52. The core of the reactor is composed of a plurality of core members, and in the second step, the magnetic characteristic is changed by changing a gap length between the core members according to the operation mode. A computer-readable recording medium recording the program to be executed by the computer according to claim 51. 53. In the first step, when the accelerator opening and the reactor current have a proportional relationship, the operation mode is detected as a high load operation mode for driving the motor in a high load state. When there is no proportional relationship between the accelerator opening and the reactor current, the operation mode is detected as a low load operation mode for driving the motor in a low load state, and the operation state of the motor is further detected. When the high load operation mode is detected, the gap length is changed according to the accelerator opening degree in the second step, and when the low load operation mode is detected, in the second step. 53. A computer having a program recorded thereon according to claim 52, wherein the gap length is changed according to an operating state of the motor. Yuta-readable recording medium. 54. In the first step, the operating state of the motor is detected based on the reactor current, and when the low load operation mode is detected, the operating state of the motor is detected according to the reactor current in the second step. The computer-readable recording medium having a program executed by a computer according to claim 53, wherein the gap length is changed. 55. In the first step, the operating state of the motor is detected based on a torque command value which is a target value of torque to be generated by the motor, and when the low load operating mode is detected, The computer-readable recording medium recording the program to be executed by the computer according to claim 53, wherein the gap length is changed according to the torque command value in the second step. 56. The computer-readable recording medium recording the program to be executed by the computer according to claim 48, further comprising a third step of reducing a periodic variation of the gap of the core. 57. The core includes a piezoelectric body provided in the gap, and the third step detects a reactor current flowing in the reactor.
And a second sub-step of generating a voltage that is in phase with the detected current waveform of the reactor current and that expands and contracts the piezoelectric body in the circumferential direction of the core, and the generated voltage. 57. A computer-readable recording medium having recorded thereon a program to be executed by a computer according to claim 56, including a third sub-step of applying to the piezoelectric body.