WO2016038683A1 - 多相交流モータ駆動用インバータ装置 - Google Patents
多相交流モータ駆動用インバータ装置 Download PDFInfo
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- WO2016038683A1 WO2016038683A1 PCT/JP2014/073791 JP2014073791W WO2016038683A1 WO 2016038683 A1 WO2016038683 A1 WO 2016038683A1 JP 2014073791 W JP2014073791 W JP 2014073791W WO 2016038683 A1 WO2016038683 A1 WO 2016038683A1
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- phase
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- inverter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
- H02P29/0243—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load the fault being a broken phase
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/0457—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by control features of the drive means as such
- B62D5/0481—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by control features of the drive means as such monitoring the steering system, e.g. failures
- B62D5/0484—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by control features of the drive means as such monitoring the steering system, e.g. failures for reaction to failures, e.g. limp home
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/122—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
- H02H7/1225—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters responsive to internal faults, e.g. shoot-through
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/084—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters using a control circuit common to several phases of a multi-phase system
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
- H02P29/027—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load the fault being an over-current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/032—Preventing damage to the motor, e.g. setting individual current limits for different drive conditions
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/14—Electronic commutators
- H02P6/16—Circuit arrangements for detecting position
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
Definitions
- the present invention relates to an inverter device for driving a multi-phase AC motor, and more particularly to an inverter device for driving a multi-phase AC motor that can cope with a failure in an inverter circuit.
- a multiphase AC motor is used in various places, for example, an electric power steering device.
- the electric power supplied to the polyphase AC motor is controlled by an inverter device for driving the polyphase AC motor.
- an inverter device for driving the polyphase AC motor.
- the electric power steering device is a device that reduces the steering torque of a driver by a driver, and is configured by combining a power source, a motor, a sensor, a three-phase AC motor driving inverter device, and a control device.
- the direction and magnitude of the rotational angular speed of the steering torque is detected by a sensor, and the power of the power source is converted to the required magnitude by an inverter device for driving a three-phase AC motor and supplied to the motor. This is a system that applies steering torque.
- Patent Document 1 when only one of the three phases of the motor fails, the drive of the motor is continued with a phase other than the failed phase as the energized phase, and the assist torque for steering is reduced.
- a method for identifying the phase in which the failure occurred is proposed.
- motor control is continued using two phases other than the energization failure phase as energization phases. It is disclosed.
- the motor relay has a parasitic diode, and since a diode may be added to prevent reverse connection and to use regenerative energy by rotating the motor, depending on the parasitic diode of the motor relay or the added diode
- a closed circuit is formed and a current flows through the closed circuit, there is a problem that brake torque is applied to the motor.
- the present invention was made to solve the above-described problem of generation of brake torque.
- An object of the present invention is to provide an inverter device.
- the present invention is connected between a power source and a multiphase AC motor, and converts the power of the power source into the polyphase AC motor by converting it into a polyphase AC, and supplies the inverter circuit,
- a first power supply switching element provided between a power supply and the inverter circuit for opening and closing an electric circuit between the power supply and the inverter circuit; an output point for each phase of the inverter circuit; and the multiphase AC motor;
- a switching element for a motor relay that opens and closes an electric circuit between the output point and the multiphase AC motor, and is located downstream of the first power switching element when viewed from the power source.
- the phase winding of the multiphase AC motor is arranged in parallel with the motor relay switching element. A diode in a direction flowing into the line is connected.
- the phase of the multiphase AC motor is parallel to the motor relay switching element. A diode in the direction of flowing out of the winding is connected.
- the phase in which the failure has occurred can be disconnected, and the motor drive can be continued with only the remaining phase, and the power relay and the motor relay
- the direction of the diode connected in parallel with the switching element By defining the direction of the diode connected in parallel with the switching element, the formation of a closed circuit that causes a brake torque is prevented.
- FIG. 1 is an overall configuration circuit diagram of an electric power steering device including an inverter device for driving a three-phase AC motor according to Embodiment 1.
- FIG. FIG. 5 is an overall configuration circuit diagram of an electric power steering device including an inverter device for driving a three-phase AC motor according to a second embodiment.
- FIG. 6 is a partial circuit diagram of an electric power steering device including an inverter device for driving a three-phase AC motor according to a third embodiment.
- FIG. 6 is a partial circuit diagram of an electric power steering device including an inverter device for driving a three-phase AC motor according to a third embodiment.
- FIG. 1 is an overall configuration circuit diagram of an electric power steering apparatus including an inverter apparatus according to Embodiment 1 of the present invention.
- the inverter device 1 is configured to supply a current from a power source 6 mounted on the vehicle to the motor 2.
- the inverter device 1 includes an inverter circuit 3 and a control circuit 4, a rotation sensor 5 is provided in the motor 2, and information detected by the rotation sensor 5 is input to the control circuit 4. Between the power supply 6 and the inverter circuit 3, an ignition switch 7 for starting the operation of the control circuit 4, a capacitor and a coil for noise suppression on the power supply line (+ B, ⁇ ground) of the power supply 6, and the inverter circuit 3 There is provided a first power supply switching element 15 having a relay function for turning on and off the current to the power source.
- the first power supply switching element 15 is, for example, an FET of a semiconductor element, and a parasitic diode is disposed in the forward direction with respect to the current supply direction with respect to the FET, and the power supply 6 is erroneously reversed in the reverse direction. Even if connected, it is configured to protect by cutting off the current.
- the inverter circuit 3 includes two switching elements 31U and 32U in the upper and lower arm circuits for each phase of the three-phase windings (U, V, W) of the motor 2, for a total of six (
- 34U is provided.
- a capacitor 30U is connected to each of the U-phase, V-phase, and W-phase arm circuits to suppress noise.
- a shunt resistor 33U is provided for detecting the current flowing through the motor 2 for each phase of the arm circuit.
- a second power switching element 35U is provided on the input side of each phase arm circuit. The current input to the arm circuit for each phase can be turned ON / OFF by the second power switching element 35U.
- the switching elements 31U and 32U and the motor relay switching element 34U provided in the inverter circuit 3 are semiconductor elements, for example, N-channel MOSFETs, and parasitic diodes in the direction shown in the figure are arranged in parallel.
- parasitic diodes are not entered on the circuit diagram, but are written in order to facilitate understanding of the relationship between the source and the drain, and instead of expressing the relationship between the source and the drain, the direction of the diode is used. expressing.
- the switching elements 31U and 32U and the motor relay switching element 34U provided in the upper and lower arm circuits, respectively, are each controlled by PWM (pulse width modulation) based on a command from the control circuit 4, and the arm circuit
- PWM pulse width modulation
- the DC power supplied from the DC power supply 6 can be converted into AC and supplied to the three phases of the motor 2 by turning ON / OFF the switching elements 31U and 32U.
- the second power switching element 35U is also composed of a semiconductor element such as an FET, the parasitic diode is disposed in the opposite direction to the current supply direction, and the gate is turned off. It is necessary to cut off the current completely.
- a control circuit 4 in the inverter device 1 calculates a control amount for a current supplied to the winding of the motor 2 based on information from a sensor 8 such as a vehicle speed sensor and a torque sensor that detects steering torque of the steering.
- the CPU calculates the current supplied to the windings of the motor 2 based on the input information from the sensor 8, and outputs the result to the drive circuit 11. Signals are output to the switching elements 31U, 32U, 34U, and 35U.
- the switching elements 31 ⁇ / b> U, 32 ⁇ / b> U, 34 ⁇ / b> U, and 35 ⁇ / b> U of each phase are driven based on the drive signal from the drive circuit 11, and current flows through the windings of each phase of the motor 2. Further, the supplied current value is detected by the monitor circuit 12, and feedback control is performed according to the deviation from the calculated value (target value) of the CPU 10.
- the drive circuit 11 controls the first power supply switching element 15 and the CPU 10 calculates the rotational position and speed of the motor 2 via the rotation sensor 5 and the rotation angle detection circuit 13.
- the U phase is described, but the same handling is performed for the V phase and the W phase.
- a failure of the switching element of the inverter circuit 3, particularly a short-circuit failure is assumed. Fault detection is performed by a configuration in which current detection is performed based on the voltage across the terminals of the shunt resistor 33U connected in series to the circuit. That is, the phase which has failed can be specified by comparing the current value acquired for each phase with the reference value. When the failure phase is specified in this manner, the failure phase is completely separated by turning off the second power supply switching element 35U and the motor relay switching element 34U in the failure phase.
- connection is switched so as not to flow from the parasitic diode of the second power supply switching element 35U and from the parasitic diode of the motor relay switching element 34U, and only the phase in which the failure has occurred is completely removed. It is designed to be in a blocked state.
- the motor relay switching element 34U and the second power switching element 35U are turned OFF so that the U-phase arm circuit of the inverter circuit 3 can be electrically disconnected.
- the motor relay switching element 34U and the second power switching element 35U are turned off.
- the motor relay switching element 34U and the second power supply switching element 35U are turned off to electrically isolate the faulty phase from the inverter circuit 3, thereby preventing a closed circuit from being formed. The generation of torque can be prevented.
- the inverter circuit is operated by the remaining two phases that operate normally, inverter switching is continued, and current supply to the motor 2 is continued as two-phase driving.
- Embodiment 2 will be described with reference to FIG.
- the difference between FIG. 1 of the first embodiment and FIG. 2 of the second embodiment is that the position of the second power switching element 37U provided in the inverter circuit 3 is the same as the second power switching element of FIG.
- the difference from 35U and the direction of the parasitic diode of the motor relay switching element 36U are different from the direction of the parasitic diode of the motor relay switching element 34U of FIG. Since the others are the same, the same reference numerals are given.
- the second embodiment was made to achieve the same effect for the same purpose and problem when the parasitic diode of the switching element 36U for motor relay uses an element opposite to that of the first embodiment. Is.
- the switching element 31U or 32U for the upper or lower arm circuit when the switching element 31U or 32U for the upper or lower arm circuit is short-circuited, it is necessary to disconnect the U-phase arm circuit from the power supply line. Therefore, it is necessary to insert the second power supply switching element 37U either upstream or downstream of the switching elements 31U and 32U of the upper and lower arm circuits of the power supply line.
- the direction of the parasitic diode of the motor relay switching element 36U is the direction in which the current flows out from the motor winding, for example, when the switching element 32U of the lower arm circuit is short-circuited, the motor relay A current path is made to the switching element 32U of the lower arm circuit through the switching element 36U.
- the downstream end of the capacitor 30U is connected to the upstream of the second power switching element 37U, that is, the connection point with the shunt resistor 33U.
- the V phase and the W phase are also configured in the same manner, so that only the phases can be separated at the time of a short circuit failure of each switching element 31U, 32U, and the capacitor 30U, so that a closed circuit is not configured.
- the motor drive can be continued with the remaining two phases, and the generation of brake torque due to the failure phase can be avoided. That is, a capacitor is arranged for each phase in parallel with the switching elements 31U and 32U of the upper and lower arm circuits of each phase in the inverter circuit 3.
- Embodiment 3 FIG. Next, a case where the number of shunt resistors 33 for current detection is one will be described. Even one shunt resistor 33 is considered in the same manner as in the first and second embodiments, and two types are conceivable depending on the location of the second power supply switching elements 35U and 37U.
- FIG. 3 and FIG. 4 show two partial circuit diagrams of the single shunt 33 depending on the difference between the second power supply switching elements 35 and 37.
- FIG. 3 shows that the second power switching element 35 is arranged upstream of the arm circuit of the inverter circuit 3 as shown in the first embodiment.
- a shunt resistor 33 is connected to the downstream of the switching element 32 of the lower arm circuit, and one phase is connected. Further, the negative terminal of the capacitor 30 is connected to the ground line on the downstream side of the shunt resistor so that the phases can be separated even when the capacitor 30 is short-circuited.
- FIG. 4 shows the second power supply switching element 37 according to the second embodiment arranged on the downstream side.
- the shunt resistor 33 it is necessary to arrange the shunt resistor 33 on the most upstream side. That is, the same effect can be obtained by disposing the first power supply switching element 15 on the downstream side. Further, the positive terminal of the capacitor 30 is connected to the upstream side of the shunt resistor 30.
- the current of each phase can be detected by the shunt resistor 33 by adjusting the current detection timing, and further, the detection timing is shifted by shifting the PWM drive phase of each phase. Acquiring accuracy is improved by performing processing to ensure the above.
- the failure between each phase can be monitored by monitoring the drain-source voltage of each switching element. This is to detect a failure by detecting that the drain-source voltage is abnormally large when the switching element is turned on or that the drain-source voltage is abnormally small when the switching element is turned off. Is possible.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Inverter Devices (AREA)
- Control Of Ac Motors In General (AREA)
- Power Steering Mechanism (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
Description
この提案の前提として、三相(U、V、W)のモータコイルのうちいずれか一相のみについての通電不良の場合に、通電不良の相以外の二相を通電相としてモータ制御を続行することが開示されている。
この発明は、前述のブレーキトルクの発生の問題を解決するために行われたもので、インバータ回路のアーム回路の1相に故障が発生した場合、この故障の相のみを切り離すことにより、残りの相でモータ駆動を継続し得ると共に、できる限り少ない部品の追加とその接続の向きに条件を付けるだけで、ブレーキトルクを発生させる要因となる閉回路の形成を防止し得る多相交流モータ駆動用インバータ装置を提供することを目的とするものである。
また、第2の電源用スイッチング素子を、インバータ回路内の下側のアーム回路のスイッチング素子の下流側に配置した場合には、モータリレー用スイッチング素子に対して並列に、多相交流モータの相巻線から流れ出る方向のダイオードを接続したものである。
実施の形態1.
図1は、この発明の実施の形態1のインバータ装置を含む電動パワーステアリング装置の全体構成回路図である。電動パワーステアリング装置において、インバータ装置1は、車両に搭載された電源6からの電流をモータ2に供給するように構成されている。
また、各相のアーム回路内のコンデンサ30Uあるいはアーム回路内の配線において、何らかの故障が発生した場合においても同様に、モータリレー用スイッチング素子34Uと第2の電源用スイッチング素子35UとをOFFにして、相単位で、故障の相を電気的に切り離す。
このように、モータリレー用スイッチング素子34Uと第2の電源用スイッチング素子35UとをOFFにして、インバータ回路3から故障の相を電気的に切り離すことによって、閉回路を形成することがなく、ブレーキトルクの発生を防止できることになる。
故障の相を電気的に切り離した後は、正常に動作する残りの2相によってインバータ回路を動作させ、インバータスイッチングを継続し、2相駆動としてモータ2への電流の供給を継続する。
次に、実施の形態2について、図2を用いて説明する。実施の形態1の図1とこの実施の形態2の図2の差異は、インバータ回路3内に設けられた第2の電源用スイッチング素子37Uの位置が、図1の第2の電源用スイッチング素子35Uと異なる点と、モータリレー用スイッチング素子36Uの寄生ダイオードの向きが、図1のモータリレー用スイッチング素子34Uの寄生ダイオードの向きと異なるものである。その他は同一のため同一符号を付している。
この実施の形態2は、モータリレー用スイッチング素子36Uの寄生ダイオードが、実施の形態1と逆向きとなる素子を使用した場合に、同一目的・課題に対して同一の効果を奏するためになされたものである。この実施の形態2においても、実施の形態1と同様に、上側又は下側アーム回路用のスイッチング素子31U、又は32Uが短絡した場合、U相のアーム回路を電源ラインから切り離す必要がある。そのために、第2の電源用スイッチング素子37Uを電源ラインの上側・下側アーム回路のスイッチング素子31U、32Uの上流、又は下流のいずれかに挿入する必要がある。実施の形態2ではモータリレー用スイッチング素子36Uの寄生ダイオードの向きが、モータ巻線より電流が流出する方向であるため、例えば下側アーム回路のスイッチング素子32Uが短絡故障した場合は、モータリレー用スイッチング素子36Uを介して、下側アーム回路のスイッチング素子32Uまで電流経路ができてしまう。そこで下側アーム回路のスイッチング素子32Uの下流であって、かつシャント抵抗33Uの下流側に第2の電源用スイッチング素子37Uを挿入することでこれを解決する。但し、シャント抵抗33Uは、電流を検出する目的のために設けたものであるので、電流の検出あるいは故障部分の検出手段として他の手段が存在するのであれば、必ずしもシャント抵抗33Uに対する第2の電源用スイッチング素子37Uの位置関係は必要な条件ではない。
次に、電流検出のためのシャント抵抗33を1本とした場合を説明する。1本のシャント抵抗33であっても実施の形態1、及び2と同様に考え、また第2の電源用スイッチング素子35U、37Uの配設場所により2種類が考えられる。図3及び図4に1本シャント33であって、第2の電源用スイッチング素子35、37の違いにより2通りの部分回路図を示した。
また、シャント抵抗を3本または1本とした構成において,相毎の故障に関しては各スイッチング素子のドレイン―ソース間電圧を監視することでも可能である。これはスイッチング素子をオンした際のドレイン―ソース間電圧が異常に大きいことや、スイッチング素子をオフした際のドレイン―ソース間電圧が異常に小さいことを検出することによって等、故障を検出することが可能である。
Claims (7)
- 電源と多相交流モータとの間に接続され、前記多相交流モータに前記電源の電力を多相交流に変換して供給するインバータ回路、前記電源と前記インバータ回路との間に設けられ前記電源と前記インバータ回路との間の電路を開閉する第1の電源用スイッチング素子、前記インバータ回路の相毎の出力点と前記多相交流モータとの間に設けられ前記出力点と前記多相交流モータとの間の電路を開閉するモータリレー用スイッチング素子、前記電源から見て第1の電源用スイッチング素子よりも下流側で、前記インバータ回路の相毎に設けられた第2の電源用スイッチング素子、および前記第1のスイッチング素子と前記第2のスイッチング素子と前記モータリレー用スイッチング素子と前記インバータ回路のスイッチング制御を行う制御回路を備え、前記第1のスイッチング素子に対して並列に、電流供給方向と順方向に接続された第1のダイオードが設けられ、前記第2のスイッチング素子に対して並列に、電流供給方向と逆方向に接続された第2のダイオードが設けられたことを特徴とする多相交流モータ駆動用インバータ装置。
- 前記インバータ回路の内には、相毎に上側及び下側の、スイッチング素子を有するアーム回路が設けられており、前記第2の電源用スイッチング素子は、前記インバータ回路の上側の前記アーム回路の前記スイッチング素子の上流側に配置されていることを特徴とする請求項1に記載の多相交流モータ駆動用インバータ装置。
- 前記インバータ回路の内には、相毎に上側及び下側の、スイッチング素子を有するアーム回路が設けられており、前記第2の電源用スイッチング素子は、前記インバータ回路の下側の前記アーム回路の前記スイッチング素子の下流側に配置されていることを特徴とする請求項1に記載の多相交流モータ駆動用インバータ装置。
- 前記モータリレー用スイッチング素子に対して並列に、前記多相交流モータの相巻線に流れ込む方向のダイオードを接続したことを特徴とする請求項2に記載の多相交流モータ駆動用インバータ装置。
- 前記モータリレー用スイッチング素子に対して並列に、前記多相交流モータの相巻線から流れ出る方向のダイオードを接続したことを特徴とする請求項3記載の多相交流モータ駆動用インバータ装置。
- 前記インバータ回路の内の各相の上下アーム回路のスイッチング素子と並列に、相毎にコンデンサを配置したことを特徴とする請求項1から5のいずれか1に記載の多相交流モータ駆動用インバータ装置。
- 電流を検出するためのシャント抵抗を、上下アーム回路のスイッチング素子に対して直列に配設し、前記コンデンサを前記上下アーム回路のスイッチング素子と前記シャント抵抗の直列接続された相に対して並列に挿入したことを特徴とする請求項6に記載の多相交流モータ駆動用インバータ装置。
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US15/324,913 US9793849B2 (en) | 2014-09-09 | 2014-09-09 | Inverter apparatus for polyphase AC motor drive |
CN201480081758.0A CN106716822B (zh) | 2014-09-09 | 2014-09-09 | 多相交流电动机驱动用逆变器装置 |
JP2016547290A JP6157752B2 (ja) | 2014-09-09 | 2014-09-09 | 多相交流モータ駆動用インバータ装置 |
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US9793849B2 (en) | 2017-10-17 |
US20170201204A1 (en) | 2017-07-13 |
EP3193443A4 (en) | 2018-04-18 |
CN106716822A (zh) | 2017-05-24 |
JPWO2016038683A1 (ja) | 2017-04-27 |
JP6157752B2 (ja) | 2017-07-05 |
CN106716822B (zh) | 2019-09-17 |
EP3193443A1 (en) | 2017-07-19 |
EP3193443B1 (en) | 2022-05-04 |
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