JP2000116180A - Controller for chopping power application to electric motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make possible the low-speed driving of a switched reluctance motor even when one of its two switching devices connected with its coils is short-circuited. SOLUTION: In a controller for a chopping power application, the presences of the respective short circuits of a first switching device IGBT/U and a second switching device IGBT/L are decided respectively from the output signals of current sensors IS of coils CL1. When the switching device IGBT/U of the first and second switching devices IGBT/U, IGBT/L is sort-circuited and the other switching device IGBT/L is not shot-circuited, a power application/non power application indicating signal S11 is given to the switching device IGBT/U subjected to the short circuit, and a PWM signal S14 is given to the switching device IGBT/L subjected to no short circuit, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chopping energization control device installed corresponding to each of a plurality of phase coils provided in a stator of an electric motor such as a switched reluctance motor.

[0002]

2. Description of the Related Art In energization control of a switched reluctance motor, chopping energization control is performed to maintain the actual current value of a coil at a value close to a reference current value. To perform this chopping control, a first switching element inserted between one end of the coil and the power supply high potential line and a second switching element inserted between the other end of the coil and the power supply low potential line Switching for generating a first switch drive signal for turning on / off one of the elements and a second drive signal for repeatedly turning on / off the other while the first drive signal indicates switch-on A drive signal generation circuit is provided.

[0003]

It is desirable that an electric motor used as a prime mover of an automobile can be driven at least at a low speed, even if it cannot be driven as in a normal state when various abnormalities occur.

In the case where each coil and a pair of switching elements for turning on / off the energization thereof are connected in a star connection or a delta connection, such as an induction electric motor or an electric motor using a permanent magnet, even one switching element is provided. If the short circuit occurs, the chopping control of the current cannot be performed, and the motor cannot be driven.

On the other hand, in a switched reluctance motor, the connection of each phase to the power supply line is independent of each other. Therefore, even if one of the pair of switching elements associated with each coil is short-circuited, the other is short-circuited. If not,
Although high-speed driving and regenerative operation cannot be performed, current chopping control can be performed using the other switching element, so that low-speed driving can be performed.

The invention of this application is directed to a chopping energization control device for an electric motor, such as a switched reluctance motor, in which connection of each phase to a power supply line is independent of one another, and one of a pair of switching elements associated with each coil. It is an object of the present invention to be able to drive at a low speed even if one is short-circuited and the other is not short-circuited.

[0007]

The invention according to claim 1 of the present application is a chopping energization control device installed corresponding to each of a plurality of phase coils provided in a stator of an electric motor, A first switching element interposed between one end and a power supply high-potential line, and a second switching element interposed between the other end of the coil and the power supply low-potential line
A first drive signal for turning on / off one of the switching elements and a second drive signal for repeatedly turning on / off the other while the first drive signal indicates switch-on. In a device provided with a switching element drive signal generating means, it is determined whether or not each of the first and second switching elements has a short circuit, and one of the first and second switching elements has a short circuit. When there is no short circuit, the first drive signal is supplied to the switching element having the short circuit, and the second drive signal is supplied to the switching element having no short circuit. Is a chopping energization control device for an electric motor.

According to a second aspect of the present invention, there is provided the chopping energization control device for an electric motor according to the first aspect, wherein each of the first and second switching elements determines whether or not there is a short circuit. A chopping energization control device for an electric motor, characterized in that the chopping energization control device for an electric motor is performed based on the relationship between the application of the first and second drive signals to first and second switching elements and the magnitude of the actual current of the coil.

According to a third aspect of the present invention, there is provided the chopping energization control device for an electric motor according to the first or second aspect, wherein each of the first and second switching elements has a short-circuit. Determining means for determining, and switching means for switching a signal transmission path between each of the first and second switching elements and the switching drive signal generating means based on a result of the determination by the determining means. This is a chopping energization control device for an electric motor.

As described above, in the electric motor chopping energization control device according to claims 1 to 3 of the present application, it is determined whether or not each of the first and second switching elements has a short circuit. When one of the second switching elements has a short circuit and the other has no short circuit, the first driving signal is supplied to the switching element having the short circuit and the second drive signal is supplied to the switching element having no short circuit. Since the drive signals are respectively given, the first and second
If one of the switching elements has a short circuit and the other has no short circuit, it can be driven at a low speed.

[0011]

FIG. 1 is a block diagram showing a schematic configuration of an energization control unit CON of a three-phase switched reluctance motor as an electric motor for traveling of an electric vehicle.
As shown in FIG. 1, the energization control device CON includes an energization control unit CON1 for the first phase coil and an energization control unit C for the second phase coil.
ON2 and an energization control unit CON3 for the third phase coil. The number of magnetic poles of the stator of the three-phase switched reluctance motor is twelve, and the number of magnetic poles of the rotor is eight.

The first phase coil energization control unit CON1, the second
The energization control unit CON2 for the phase coil and the energization control unit CON3 for the third phase coil have substantially the same configuration.

The configuration of the first phase coil power supply control unit CON1 will be described with reference to the block diagram of FIG. In FIG. 2, the energization control unit CON1 of the first phase coil CL1 includes an angle sensor RAS, a memory ROM, a microcomputer C
PU, current waveform generation circuit IPGC, current comparison circuit ICM
P1 and ICMP2, PWM signal generation circuit PWMC,
The switching circuit SWC and the first-phase coil driver DR1 are main components.

The angle sensor RAS detects the angle of the rotor of the switched reluctance motor, and uses the digital signal S2 to output the detected rotor angle to the microcomputer CP.
U and the address decoder ASD in the conduction current waveform generation circuit IPGC and the conduction / non-conduction determination circuit EDDC.

[0015] The memory ROM stores various data relating to the energization control of the first phase coil. That is, a predetermined number of sets of energization start angle data and energization end angle data and a large number of current waveform data (corresponding to a combination of the rotation speed and torque of the switched reluctance motor) (A data representing a reference current value to be passed through the first phase coil CL1 at a given rotor angle) and a number of PWM duty data.

The microcomputer CPU responds to the switching of the main switch, which is closed during operation of the electric vehicle, from open to closed, and outputs a reset pulse signal S3 to the energizing / non-energizing circuit in the current waveform generating circuit IPGC. The output to the energization determination circuit EDDC, and the presence or absence of an abnormality is determined, and a binary signal S4 indicating the presence or absence of an abnormality is output to the energization control unit CO
Output to the N1 energization / non-energization determination circuit EDDC. The high level of the binary signal S4 indicates that there is no abnormality, and the low level thereof indicates that there is abnormality.

When the result of the determination as to the presence or absence of the abnormality is no abnormality, the microcomputer CPU sequentially calculates the number of revolutions of the switch reluctance motor based on the digital signal S2 from the angle sensor RAS, and simultaneously operates the shift lever and the brake. A target torque of the switched reluctance motor is sequentially calculated based on information S1 input from the switch, the accelerator switch, and the accelerator opening sensor, and a set of energization start angle and energization corresponding to the calculated rotation speed and torque. The end angle, one current waveform,
One PWM duty is read from the memory ROM,
The read set of the energization start angle and the energization end angle are output to the energization / non-energization determination circuit EDDC in the current waveform generation circuit IPGC as digital signals S5 and S6, respectively. Further, the read current waveform is converted to a digital signal S7.
To the memory RAM in the current waveform generation circuit IPGC. Further, the read PWM duty is output to the PWM signal generation circuit PWMC as a digital signal S8.

The microcomputer CPU further executes a switching element short-circuiting process shown in the flowchart of FIG. 5 based on the binary signal S24 output from the current comparison circuit ICMP2, and outputs a binary signal S9 corresponding to this processing result to P
WM signal generation circuit PWMC and first phase coil driver DR
Output to switching circuit SWC for switching the signal transmission path between one transistor IGBT / U and IGBT / L.

One of the two input terminals of the current comparison circuit ICMP2 has an analog signal S12 (current value flowing through the first phase coil CL1) inputted from a current sensor IS attached to the first phase coil driver DR1. ), And a transistor (gate-insulated bipolar transistor) IGBT / which is a switching element constituting the first phase coil driver DR1 is input to the other input terminal.
An analog signal representing a reference current value Ir for determining whether or not U and IGBT / L are short-circuited is input. This reference current value Ir is set to be larger than the maximum current value flowing through the first phase coil CL1 when the first phase coil driver DR1 is normal. If the current value represented by the signal S12 is less than the reference current value Ir, the signal S24 goes high, and the current value represented by the signal S12 becomes the reference current value I.
If r or more, the signal S24 becomes low level. That is,
When an overcurrent flows through the first phase coil CL1, the signal S24
Becomes low level.

In the flowchart of FIG. 5, it is determined in step S10 whether the signal S24 is at a low level. If the signal S24 is at low level, step S1
In step S15, if the signal S24 is at a high level, the process proceeds to step S15, where it is determined whether the overcurrent occurrence flag F1 is on. If not, the process proceeds to step S16. The advance signal S9 is set to a high level. If the signal S24 is low, the process proceeds to step S12 via step S11, and it is determined whether the signal S9 is low. If not, the process proceeds to step S14 to set the signal S9 to low. Also,
If the result of determination in step S12 is that signal S9 is not low, the flow advances to step S13 to turn on failure flag FD1. When the failure flag FD1 is on, the microcomputer CPU sets the signal S4 to a low level in order to prohibit energization of the first phase coil CL1.

The memory RA of the current waveform generating circuit IPGC as a digital signal S7 from the microcomputer CPU
The current waveform input to M, that is, reference current value data corresponding to the rotor angle is stored in the memory RAM at an address corresponding to the rotor angle. The angle input to the address decoder ASD in the current waveform generation circuit IPGC as the digital signal S2 from the angle sensor RAS is stored in the memory RAM
Is translated to Current waveform generation circuit IPGC
Each time the angle detected by the angle sensor RAS changes, a reference current value corresponding to the angle is read from the memory RAM, converted from a digital signal to an analog signal by the digital / analog converter D / A, and output from the output buffer BUF. Current comparison circuit IC as analog signal S10
Output to MP.

An energization / non-energization determination circuit EDDC in the current waveform generation circuit IPGC energizes the first phase coil CL1 based on the signal S2 input from the angle sensor RAS and the signals S3 to S6 input from the microcomputer CPU. / Generating a binary signal S11 indicating the non-energized state, the two transistors IG of the energized / deenergized determination circuit EDDC and the PWM signal generation circuit PWMC and the first phase coil driver DR1
Output to switching circuit SWC for switching the signal transmission path between BT / U and IGBT / L. The high level of the binary signal S11 indicates energization, and the low level indicates non-energization. If the signal S4 is at a low level (indicating an abnormality), the signal S11 is held at a low level. When the signal S4 is at a high level, the signal S11 is once set to a low level by the input of the reset pulse signal S3, and thereafter, the signal S11 reaches the energization start angle represented by the signal S5. Then, the level is switched from the low level to the high level, and is switched from the high level to the low level when the rotor angle represented by the signal S2 reaches the energization end angle represented by the signal S6.

The first-phase coil driver DR1 includes a transistor IGBT / U interposed between one end of the one-phase coil CL1 and a high-potential line (+) from a DC power supply, and the other end of the first-phase coil CL1. Transistor IGBT / L inserted between low potential line (-) from DC power supply
A diode D1 inserted between one end of the first phase coil CL1 and the low potential line (-);
1 and a diode D2 interposed between the high-potential line (+) and the other end.

A current sensor IS for detecting a current value (actual current value) actually flowing through the first phase coil CL1 is interposed between one end of the first phase coil CL1 and the transistor IGBT / U. The current sensor IS outputs an analog signal S12 representing a current value actually flowing through the first phase coil CL1.
Is output to the comparison circuits ICMP1 and ICMP2.

The comparison circuit ICMP1 has a first phase coil CL
1 is compared with an analog signal S12 representing a current value actually flowing through the first phase coil CL1, and a current value actually flowing through the first phase coil CL1 is compared with the reference current value. A binary signal S13 indicating whether the signal is small is output to the PWM signal generation circuit PWMC. The high level of the binary signal S13 indicates that the current value actually flowing to the first phase coil CL1 is smaller than the reference current value, and the low level indicates that the current value actually flowing to the first phase coil CL1 is equal to or greater than the reference current value. Indicates that there is something.

The PWM signal generation circuit PWMC processes the input digital signal S8 and the binary signals S11 and S13 to generate a PWM signal (binary signal) S14 and outputs it to the switching circuit SWC.

The PWM signal generation circuit PWMC has a configuration as shown in FIG. In FIG. 3, a digital signal S8 (representing a PWM duty) output from the CPU is latched as a 12-bit digital signal S15 by a latch LCH, and is input to a comparison circuit CMP. The binary signal S11 output from the energization / non-energization determination circuit EDDC is input to the input terminal D of the flip-flop FDC1 and the input terminal CLK of the flip-flop FDC2, and to the reset input terminal RESET of the flip-flop FDC1 via the inverter INV1. Is entered. Comparison circuit ICMP
Outputs a binary signal S13.
1 input terminal CLK and the inverter IN
The signal is input to the reset terminal RESET of the flip-flop FDC2 via V2.

The binary signal S16 output from the inverted output terminal QI of the flip-flop FDC1 is connected to the OR gate OR1.
The binary signal S17 output from the OR gate OR1 is input to the reset input terminal of the 12-bit counter CNT, and the overflow signal (binary signal) S18 of the 12-bit counter CNT is input to the OR gate O.
It is input to the other input terminal of R1. The 12-bit counter CNT counts the PWM clock, and the comparator CMP receives a 12-bit digital signal S19 representing the count value. The comparator CMP compares the input signal S15 with the signal S19 and outputs a binary signal. S20 is output. This signal S20 becomes low level when the signal S19 is smaller than the signal S15, and the signal S19 becomes the signal S15.
Is high and when the signal S19 is greater than the signal S15.

The binary signal S20 output from the comparison circuit CMP
Is input to one input terminal of the OR gate OR2, and the flip-flop F is connected to the other input terminal of the OR gate OR2.
The binary signal S21 output from the output terminal Q of DC2 is input. The output of the OR gate OR2 is the PWM signal S14
Becomes Note that a constant voltage is applied to the input terminal D of the flip-flop FDC2.

The PWM signal generating circuit PW having the above configuration
In the MC, the output signal S21 of the flip-flop FDC2 switches from the low level to the high level by switching the binary signal S11 from the low level to the high level (instruction to start energization of the coil CL1). Switch from low level to high level. The binary signal S13 is
The signal S11 is switched from the low level to the high level in synchronization with the switching of the signal S11 from the low level to the high level (the signal S10 representing the reference current value is supplied to the coil CL1 by the coil CL1).
1 becomes larger than the signal S12 representing the actual current value). Thereafter, when the binary signal S13 switches from the high level to the low level (when the actual current value of the coil CL1 reaches the reference current value), the flip-flop FDC2 is reset, and the signal S21 switches from the high level to the low level. . Therefore, the PWM signal S14 is maintained at a high level from the start of energization to the coil CL1 until the actual current value reaches the reference current value.

On the other hand, when the signal S11 switches from the low level to the high level, the output signal S16 of the flip-flop FDC1 changes to the high level, the signal S17 changes to the high level, and the counting operation of the 12-bit counter CNT is stopped. S19 becomes zero, and the overflow signal S18 goes low. The signal S8 is usually
Since a PWM duty greater than zero is specified, the signal S19 becomes smaller than the signal S15, and the comparison circuit C
The output signal S20 of MP becomes low level.

When the signal S13 switches from the low level to the high level after the signal S11 switches from the low level to the high level (when the actual current value of the coil CL1 reaches the reference current value and then falls below the reference current value again). ), Flip-flop FD
The output signal S16 of C1 switches from high level to low level, the signal S17 switches from high level to low level, and 1
The 2-bit counter CNT starts counting the PWM clock, and the value indicated by the signal S19 increases sequentially. Signal S1
When the value indicated by 9 becomes equal to or greater than the value indicated by signal 15, signal S2
0 switches from low level to high level. Thereafter, when the 12-bit counter CNT overflows, the signal S18
Switches from low level to high level and the signal S17 switches from low level to high level, the 12-bit counter CNT is reset, and the signal S19 changes to zero, so that the signal S20 changes from high level to low level. Switch. Since the signal S18 switches to the low level again by resetting the 12-bit counter CNT, the 12-bit counter CNT restarts counting the PWM clock. As described above, the signal S20 alternately repeats the low level state and the high level state, and the time t of the low level state becomes t.
The sum of 1 and the high level state time t2 is constant, and t2 /
PWM where the value of (t1 + t2) is indicated by signal S8
It becomes a PWM signal corresponding to the value of the duty. Signal S
Since the signal S21 is at the low level when the signal 20 starts repeating the low level state and the high level state alternately, the signal S14 becomes a PWM signal that matches the signal S20.

After that, when the signal S11 switches from the high level to the low level (instruction to terminate the energization of the coil CL1),
Since the output S16 of the flip-flop FDC1 switches from the low level to the high level and the signal S17 goes to the high level, the count operation of the 12-bit counter CNT stops, the state where the signal S19 indicates zero, and the signal S2
0 is maintained at a low level, and the signal S14 is maintained at a low level.

As shown in FIG. 4, the switching circuit SWC
AND gates AND1, AND2, AND3, AN
D4, two OR gates OR3 and OR4, and one inverter INV3. Energized / deenergized determination circuit EDD
The signal S11 output by C is input to one input terminal of the AND gate AND1 and one input terminal of the AND gate AND3. The signal S14 output from the PWM signal generation circuit PWMC is input to one input terminal of the AND gate AND2 and one input terminal of the AND gate AND4. Signal S9 output from microcomputer CPU
Is input to the other input terminal of the AND gate AND1 and the other input terminal of the AND gate AND4, and is input to the other input terminal of the AND gate AND2 and the other input terminal of the AND gate AND3 via the inverter INV3. You. The outputs of the AND gates AND1 and AND2 are input to an OR gate OR3.
3 is input to the transistor IGBT / L. The outputs of the AND gates AND3 and AND4 are input to an OR gate OR4.
The output signal S23 of R4 is input to the transistor IGBT / U.

Thus, in the switching circuit SWC, when the signal S9 is at a high level, the signal S22 matches the signal S11 and the signal S23 matches the signal S14. If the signal S9 is at a low level, the signal S23 becomes the signal S23.
11, and the signal S22 matches the signal S14.

The transistor IGBTU of the first-phase coil driver DR1 turns on (conducts) when the signal S22 is at a high level, and turns off (non-conducts) when the signal S22 is at a low level. Similarly, the transistor IGBTL is
When the signal S23 is at a high level, it is turned on (conducting), and when the signal S23 is at a low level, it is turned off (not conducting).

When signal S9 output from microcomputer CPU is at a high level, signals S22 and S23 coincide with signals S11 and S14, respectively. If the signal S11 is at a low level (indicating non-conduction), the signal S14 is also at a low level, so that the transistor IGBT
U and IGBTL are both turned off, so that no power supply current flows through coil CL1. If the signal S11 is at a high level (indicating the energization) and the signal S14 is at a high level, both the transistors IGBTU and IGBTL are turned on, so that the power supply current flows through the coil CL1. Signal S1
If the signal S14 is at a low level even when the signal S1 is at a high level, the transistor IGBTL continues to be turned on but the transistor IGBTU is turned off.
Stop flowing to 1. As described above, when the binary signal S11 is at a high level (the transistor IGBTL is on),
Transistor IGBT in response to level switching
As U repeats on / off, the value of the current flowing through coil CL1 is controlled to a value close to the reference current value.

When the microcomputer CPU sets the signal S9 to the high level, the coil CL is operated as described above.
If a short circuit occurs in the transistor IGBT / U while the current value of 1 is being controlled to a value close to the reference current value, the other transistor IGBT / L is kept on and flows through the coil CL1. When the power supply current unilaterally increases and exceeds the maximum current value flowing through the coil CL1 when the first phase coil driver DR1 is normal, the current comparison circuit I
The output signal S24 of the CMP2 switches from the high level to the low level. Since the coil CL1 is repeatedly energized and de-energized with the rotation of the rotor, if the signal S24 does not switch from the high level to the low level in the repetition of the energization and de-energization of the coil CL1, it is the transistor I
It is possible to determine that neither the GBT / U nor the IGBT / L has a short circuit. When the signal S24 goes low for the first time, the microcomputer CPU switches the signal S9 from high level to low level on the assumption that the transistor IGBT / U is short-circuited but the transistor IGBT / L is not short-circuited. When the signal S9 is switched from the high level to the low level, the switching operation of the switching circuit SWC causes the signal S22 to become the signal S14 and the signal S23 to become the signal S11.
It comes to match it. That is, the signal S11 is input to the short-circuited transistor IGBT / U, and the signal S11 is input to the non-short-circuited transistor IGBT / L.
The WM signal S14 is input. Thereby, the coil CL1
Can be continued to approximate the current value of the reference current value to the reference current value represented by the signal S10.

As described above, the energization control units CON2 and CON2
The configuration of ON3 is substantially the same as the configuration of the power supply control unit CON1, but the angle sensor RAS and the memory RO shown in FIG.
M and the microcomputer CPU are an energization control unit CON1 for the first phase coil and an energization control unit CON for the second phase coil.
This is a component shared by the energization control units CON3 of the second and third phase coils. The energization start angle, energization end angle, and current waveform of the second phase coil are obtained by shifting the phase of the energization start angle, energization end angle, and current waveform of the first phase coil by (45/3) degrees. 3-phase coil energization start angle,
The energization end angle and the current waveform are obtained by shifting the phase of the energization start angle, the energization end angle, and the current waveform of the first phase coil by (45 ÷ 3 × 2) degrees. Microcomputer C
The PU obtains an energization start angle, an energization end angle, and a current waveform for the second phase coil by shifting the energization start angle, the energization end angle, and the current waveform for the first phase coil by (45 ° 3) degrees. The energization start angle, energization end angle, and current waveform are output to the energization / non-energization determination circuit of the energization control unit CON2 and the memory. The energization start angle, energization end angle, and current waveform for the third phase coil are obtained by shifting the phase of the energization start angle, energization end angle, and current waveform for the first phase coil by (45 （3 × 2) degrees, The obtained energization start angle, energization end angle, and current waveform are output to the energization / non-energization determination circuit of the energization control unit CON3 and the memory.

The scope of application of the invention of this application is not limited to the switched reluctance motor, but can be appropriately changed within the scope described in the claims.

[0041]

As described above, the chopping energization control device for an electric motor according to the invention of the present application has the following features.
It is determined whether or not each of the first and second switching elements has a short circuit. If one of the first and second switching elements has a short circuit and the other has no short circuit, the switching element having the short circuit is determined. Supplies a first drive signal and a second drive signal to turn on / off repeatedly while the first drive signal indicates switch-on to a switching element having no short circuit. If one of the two switching elements has a short circuit and the other has no short circuit, it can be driven at a low speed. .

[Brief description of the drawings]

FIG. 1 is a block diagram showing an energization control device for a three-phase switched reluctance motor.

FIG. 2 is a block diagram illustrating a configuration of an energization control unit of a first phase coil.

FIG. 3 is a block diagram illustrating a configuration of a PWM signal generation circuit.

FIG. 4 is a block diagram showing a configuration of a switching circuit SWC.

FIG. 5 is a flowchart showing the contents of a switching element short-circuit process of the microcomputer CPU.

[Explanation of symbols]

CON ... energization control unit CON1 ... energization control unit of first phase coil CON2 ... energization control unit of second phase coil CON3 ... energization control unit of third phase coil RAS ... rotor angle sensor IS: current sensor ROM: memory CPU: microcomputer CL1: first-phase coil EDDC: energization / non-energization judgment circuit ICMP1, ICMP2: current comparison circuit PWMC: PWM signal Generation circuit SWC switching circuit FDC1, FDC2 flip-flop AND1, AND2, AND3, AND4 AND gate OR1, OR2, OR3, OR4 OR gate INV1, INV2, INV3 inverter LCH ..Latch CNT: 12-bit counter CMP: Comparison circuit

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Koji Goto 2-1-1 Asahi-cho, Kariya-shi, Aichi F-term (reference) in Aisin Seiki Co., Ltd. 5H550 AA01 BB08 DD09 EE08 FF07 GG08 HA06 HB16 JJ03 KK06 LL52 MM02 5H570 AA01 BB09 DD09 EE08 FF07 GG04 HA06 HB16 JJ03 KK06 LL32 MM02 5H571 AA02 BB07 EE06 FF07 GG07 HA07 HD02 JJ03 KK06 LL44 MM02 5H576 AA01 BB06 DD09 EE11 FF07 GG07 HA01 HB01 JJ03 KK06 LL06

Claims (3)

[Claims] 1. A chopping energization control device installed corresponding to each of a plurality of phase coils provided in a stator of an electric motor, wherein the chopping energization control device is interposed between one end of the coil and a power supply high potential line. A first drive signal for turning on / off one of a first switching element and a second switching element interposed between the other end of the coil and a power supply low potential line, and the first drive signal Provided with switching element drive signal generating means for generating a second drive signal for repeatedly turning on / off the other while the switch is instructing switch-on, wherein each of the first and second switching elements is provided. The presence or absence of a short circuit is determined, and when one of the first and second switching elements has a short circuit and the other has no short circuit, the short circuit is detected. A chopping energization control device for an electric motor, wherein one of the switching elements is supplied with the first drive signal, and the other of the short-circuited switching elements is supplied with the second drive signal. 2. The chopping energization control device for an electric motor according to claim 1, wherein each of the first and second switching elements determines whether or not there is a short circuit.
A chopping energization control device for an electric motor, wherein the control is performed based on the relationship between the application of the first and second drive signals to the first and second switching elements and the magnitude of the actual current of the coil. 3. The chopping energization control device for an electric motor according to claim 1, wherein said first and second switching elements each have a short circuit and a short circuit. Switching means for switching a signal transmission path between each of the first and second switching elements and the switching drive signal generating means based on a determination result of the means. Control device.