WO2024057878A1 - Dispositif de commande de moteur et dispositif de direction électrique - Google Patents

Dispositif de commande de moteur et dispositif de direction électrique Download PDF

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Publication number
WO2024057878A1
WO2024057878A1 PCT/JP2023/030676 JP2023030676W WO2024057878A1 WO 2024057878 A1 WO2024057878 A1 WO 2024057878A1 JP 2023030676 W JP2023030676 W JP 2023030676W WO 2024057878 A1 WO2024057878 A1 WO 2024057878A1
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WIPO (PCT)
Prior art keywords
semiconductor switching
motor
control device
switching element
voltage
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PCT/JP2023/030676
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English (en)
Japanese (ja)
Inventor
啓太 安
亨典 平木
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日立Astemo株式会社
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Publication of WO2024057878A1 publication Critical patent/WO2024057878A1/fr

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D6/00—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits
    • 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

Definitions

  • the present invention relates to a motor control device and an electric steering device.
  • the power conversion device of Patent Document 1 includes a first inverter connected to one end of the winding of each phase of the motor, a second inverter connected to the other end of the winding of each phase, and a second inverter connected to the other end of the winding of each phase of the motor. It includes a first relay circuit connected between one end and one of the power supply and GND, and a second relay circuit connected between the other end of each phase winding and one of the power supply and GND.
  • the first relay circuit is turned on to form a neutral point, and the remaining in the circuit is Release zero-sequence current to the outside.
  • a drive circuit that supplies power to the windings of a polyphase winding set of the motor and a neutral point of the polyphase winding set are It may be equipped with a motor relay that connects the energized path intermittently.
  • a back electromotive force is generated in the motor when the wheels are steered at high speed in conjunction with steering wheel operation or when the motor is rotated by a large reverse input from the wheels, this The back electromotive voltage flows around to the gate of the semiconductor switching element that constitutes the motor relay, and the gate voltage becomes high.
  • the semiconductor switching element constituting the motor relay in this state, the semiconductor switching element will generate heat, potentially damaging the semiconductor switching element.
  • some abnormality occurs in the electric steering system and the motor generates a back electromotive force when the motor relay is turned off to stop the current supply to the motor, the gate of the semiconductor switching element that makes up the motor relay.
  • the semiconductor switching elements that make up the motor relay would be damaged due to the back electromotive force being passed around to the motor relay.
  • the present invention has been made in view of the conventional situation, and an object thereof is to provide a semiconductor switching element that connects and connects the current-carrying path between the drive circuit and the neutral point of the motor's polyphase winding set.
  • An object of the present invention is to provide a motor control device and an electric steering device that can be prevented from being damaged by back electromotive force.
  • a motor control device is a motor control device that controls a motor having a multiphase winding set, and includes a drive circuit that supplies power to the windings of the multiphase winding set; a semiconductor switching element that connects and disconnects a current-carrying path between the drive circuit and the neutral point of the multiphase winding set; a control section that controls the drive circuit and the semiconductor switching element; and a ground and the control section that output is provided in a ground path that connects a signal path of a control signal of the semiconductor switching element, and when the potential on the side of the winding of the semiconductor switching element and the potential of the ground reach a predetermined potential difference, the A control element that turns on the semiconductor switching element.
  • the electric steering device is an electric steering device mounted on a vehicle, the motor having a multiphase winding set, and comprising a motor with a steering force for steering wheels of the vehicle.
  • the motor and a motor control device that controls the motor, and the motor control device includes a drive circuit that supplies power to the windings of the polyphase winding set, and a drive circuit that supplies power to the windings of the multiphase winding set.
  • a semiconductor switching element that connects and disconnects a current-carrying path between the neutral point of the multiphase winding set; a control unit that controls the drive circuit and the semiconductor switching element; and a semiconductor switching element that controls the drive circuit and the semiconductor switching element; Provided in a ground path connecting a signal path of a control signal of the element, when the potential on the side of the winding of the semiconductor switching element and the potential of the ground reach a predetermined potential difference, the semiconductor switching element is activated. and a control element that turns on.
  • the semiconductor switching element that connects and disconnects the current-carrying path between the drive circuit and the neutral point of the multiphase winding set of the motor from being damaged by the back electromotive force of the motor.
  • FIG. 1 is a configuration diagram of an electric power steering device.
  • FIG. 3 is a diagram showing functional blocks of a motor drive circuit and a control device.
  • FIG. 3 is a diagram showing a state in which a back electromotive force is generated in the motor.
  • FIG. 3 is a diagram for explaining an effect of protecting a semiconductor switching element from a back electromotive voltage of a motor.
  • FIG. 6 is a diagram showing a state in which a motor relay is protected by forming a return flow path. It is a flowchart which shows the diagnostic procedure of a Zener diode and a diagnostic voltage output circuit.
  • an electric power steering device installed in a vehicle is an electric power steering device that uses torque generated by a motor to supplement the force required to operate the steering wheel, and a motor control device is applied to the electric power steering device.
  • FIG. 1 is a configuration diagram showing one aspect of an electric power steering device 200 attached to a vehicle 100.
  • the steering mechanism 210 of the electric power steering device 200 includes a steering wheel 201, a steering shaft 202 which is a rotation axis of the steering wheel 201, a pinion shaft 203 provided at an end of the steering shaft 202, a rack bar 204, and a rack bar 204. It has a rack housing 205 that accommodates the.
  • the steering shaft 202 is provided with a steering angle sensor 206 that detects a steering angle ⁇ , which is a rotation angle of the steering shaft 202, and a steering torque sensor 207 that detects a steering torque TS of the steering wheel 201.
  • the steering mechanism 210 includes a motor 220 that is a steering actuator that applies a steering torque to the rack bar 204, in other words, a steering actuator that generates a steering force that moves the rack bar 204 in the axial direction.
  • the rotational motion of the motor 220 is transmitted to the rack bar 204 via a transmission mechanism 208 that includes a belt, a ball screw, or the like.
  • the application of steering torque by the motor 220 is performed to assist the driver's steering operation. Note that the steering torque applied by the motor 220 allows autonomous steering, in other words, automatic steering.
  • the motor 220 is a DC motor having a multi-phase winding set, for example, a three-phase brushless DC motor having a motor rotor and a winding set including a U-phase winding, a V-phase winding, and a W-phase winding.
  • the drive circuit 245 includes a three-phase bridge inverter made up of six semiconductor switching elements, and controls the power supplied to each winding of the motor 220 by controlling on/off of the semiconductor switching elements.
  • the control device 230 is an electronic control device including a microprocessor (in other words, a control section), and together with the drive circuit 245 constitutes a motor control device 260 .
  • the control device 230 then outputs a control signal for controlling the drive circuit 245.
  • the control device 230 receives a sensor signal related to the operating angle ⁇ of the steering shaft 202 outputted by the operating angle sensor 206, a sensor signal related to the steering torque TS outputted by the steering torque sensor 207, and a vehicle speed outputted by the vehicle speed sensor 211 (or wheel speed sensor).
  • a sensor signal related to VS, a sensor signal related to the rotor rotation angle ⁇ of the motor 220 outputted by the motor rotation angle sensor 209, and the like are acquired.
  • control device 230 calculates the steering torque output by the motor 220, in other words, the command torque that is the target value of the assist torque, based on the acquired various sensor signals. Then, the control device 230 outputs a control signal to the drive circuit 245 based on the command torque, and performs PWM (Pulse Width Modulation) control on the drive current of the motor 220.
  • PWM Pulse Width Modulation
  • FIG. 2 is a diagram showing the drive circuit 245 and the motor 220, and also represents the functions of the control device 230 in blocks.
  • Drive circuit 245 includes a three-phase bridge inverter 245A and a PWM control driver 245B.
  • the three-phase bridge inverter 245A has a U-phase arm, a V-phase arm, and a W-phase arm connected in parallel between the system power supply 246 and the ground GND.
  • the U-phase arm is configured by connecting an upper semiconductor switching element UH and a lower semiconductor switching element UL in series.
  • the V-phase arm is configured by connecting an upper semiconductor switching element VH and a lower semiconductor switching element VL in series.
  • the W-phase arm is configured by connecting an upper semiconductor switching element WH and a lower semiconductor switching element WL in series.
  • the two semiconductor switching elements in each phase arm of the three-phase bridge inverter 245A are connected to the windings of the corresponding phases of the motor 220, forming a three-phase bridge circuit.
  • the connection between the two semiconductor switching elements UH and UL of the U-phase arm is connected to the end of the U-phase winding 220U
  • the connection between the two semiconductor switching elements VH and VL of the V-phase arm is connected to the end of the U-phase winding 220U. It is connected to the end of the wire 220V
  • the portion between the two semiconductor switching elements WH and WL of the W-phase arm is connected to the end of the W-phase winding 220W.
  • the semiconductor switching elements UH, UL, VH, VL, WH, and WL that constitute the three-phase bridge inverter 245A are semiconductor elements having externally controllable control terminals, such as Metal Oxide Semiconductor Metal Field Effect Transistor (MOSFET). , Insulated Gate Bipolar Transistor (IGBT), etc. are used.
  • MOSFET Metal Oxide Semiconductor Metal Field Effect Transistor
  • IGBT Insulated Gate Bipolar Transistor
  • the semiconductor switching elements UH, UL, VH, VL, WH, and WL are N-channel MOSFETs, and parasitic diodes D1, D2, D3, D4, It has D5 and D6.
  • the parasitic diodes D1, D2, D3, D4, D5, and D6 have their anodes connected to the ground GND, cathodes connected to the system power supply 246, and allow current to flow from the ground GND toward the system power supply 246. Further, a capacitor C1 for smoothing the power supply voltage is connected between the system power supply 246 and the ground GND in parallel with the three-phase bridge inverter 245A.
  • the PWM control driver 245B is composed of a plurality of drivers that generate drive signals for each of the semiconductor switching elements UH, UL, VH, VL, WH, and WL. Each driver of the PWM control driver 245B generates a drive signal to turn on and off the semiconductor switching elements UH, UL, VH, VL, WH, and WL, in other words, a gate signal, based on the control signal output from the control device 230. and output it.
  • the windings 220U, 220V, and 220W of the motor 220 are connected in a star connection (in other words, a Y connection) that are connected together at the neutral point NP.
  • a motor relay 222 that connects and disconnects the current-carrying paths 221U, 221V, and 221W between the neutral point NP and each of the windings 220U, 220V, and 220W is arranged in the current-carrying paths 221U, 221V, and 221W.
  • the motor relay 222 is a protection relay that connects and connects the energized paths 221U, 221V, and 221W by turning on and off a semiconductor switching element. Note that the motor relay 222 can be a circuit provided in the current-carrying paths 221U, 221V, and 221W between the three-phase bridge inverter 245A and each of the windings 220U, 220V, and 220W.
  • N-channel MOSFETs are used as the semiconductor switching elements 222U, 222V, and 222W that constitute the motor relay 222.
  • Resistors (not shown) are mounted between the gates and sources of the semiconductor switching elements 222U, 222V, and 222W. This gate-source resistance functions to prevent the semiconductor switching elements 222U, 222V, and 222W from turning on when there is no gate control signal.
  • the N-channel MOSFETs serving as the semiconductor switching elements 222U, 222V, and 222W include parasitic diodes DU, DV, and DW that cause current to flow from the neutral point NP toward each of the windings 220U, 220V, and 220W. That is, the anodes of the parasitic diodes DU, DV, and DW are connected to the neutral point NP, and the cathodes are connected to the windings 220U, 220V, and 220W.
  • the motor relay control unit 232 controls the semiconductor switching elements by making the voltage applied to the gates of the semiconductor switching elements 222U, 222V, and 222W that constitute the motor relay 222 a positive voltage with respect to the source. 222U, 222V, and 222W are turned on, that is, the current-carrying paths 221U, 221V, and 221W are brought into conduction. On the other hand, when stopping the motor 220 or when some abnormality occurs in the motor control device 260, the motor relay control unit 232 turns off the semiconductor switching elements 222U, 222V, and 222W that constitute the motor relay 222, that is, The energizing paths 221U, 221V, and 221W are cut off.
  • the signal path 223 for giving the motor relay control signal (in other words, gate signal) output by the motor relay control unit 232 to the gate terminals of the semiconductor switching elements 222U, 222V, 222W connects to the ground GND at the connection point CP1.
  • a Zener diode ZD1 is arranged in a ground path 224 that connects the connection point CP1 and the ground GND.
  • the anode of the Zener diode ZD1 is connected to the connection point CP1 (signal path 223), and the cathode of the Zener diode ZD1 is connected to the ground GND.
  • a diode D11 is arranged in the ground path 224 between the Zener diode ZD1 and the ground GND.
  • the anode of the diode D11 is connected to the ground GND
  • the cathode of the diode D11 is connected to the Zener diode ZD1. That is, the connection point CP1 of the signal path 223 is connected to the ground GND via a series connection circuit of the Zener diode ZD1 and the diode D11, and the cathode of the Zener diode ZD1 and the cathode of the diode D11 are connected.
  • the neutral point voltage monitor circuit 233 is connected to the neutral point NP via a monitor path 234, and monitors the voltage at the neutral point NP.
  • the signal path 223 and the monitor path 234 are connected via a resistor R1.
  • the voltage monitor circuit 235 is connected via a monitor path 236 to a connection point CP2 provided in the ground path 224 between the Zener diode ZD1 and the diode D11. Furthermore, the diagnostic voltage output circuit 237 is connected to the connection point CP3 of the monitor path 236 via the voltage output path 238, and applies a predetermined diagnostic voltage to the ground path 224 between the Zener diode ZD1 and the diode D11. .
  • the Zener diode diagnosis section 239 controls the output of the diagnostic voltage from the diagnostic voltage output circuit 237, and detects the failure of the Zener diode ZD1 based on the neutral point voltage monitored by the neutral point voltage monitor circuit 233. Diagnose the presence or absence.
  • the failure of the Zener diode ZD1 diagnosed by the Zener diode diagnostic unit 239 is a failure in which the Zener diode ZD1 causes current to flow in the reverse direction at a voltage lower than that in normal times, and in this application, such a failure is referred to as a short-circuit failure.
  • the voltage output diagnosis unit 240 controls the output of the diagnostic voltage from the diagnostic voltage output circuit 237, and based on the control state of the diagnostic voltage output circuit 237 and the voltage monitored by the voltage monitor circuit 235, The presence or absence of a failure in the voltage output circuit 237 is diagnosed. That is, the voltage output diagnostic unit 240 diagnoses whether the diagnostic voltage output circuit 237 is outputting or stopping the diagnostic voltage in accordance with the command.
  • FIG. 3 shows that when a back electromotive voltage is generated in the motor 220, a voltage is applied in the direction indicated by the arrow, and the semiconductor switching elements UH, UL, VH, VL, WH, WL, and , indicates that a high load is applied to the semiconductor switching elements 222U, 222V, and 222W that constitute the motor relay 222.
  • the semiconductor switching elements UH, UL, VH, VL, WH, and WL that make up the three-phase bridge inverter 245A and the semiconductor switching elements 222U, 222V, and 222W that make up the motor relay 222 may be damaged by the back electromotive voltage. There is sex. Therefore, the motor control device 260 reverses the semiconductor switching elements UH, UL, VH, VL, WH, and WL that make up the three-phase bridge inverter 245A, and the semiconductor switching elements 222U, 222V, and 222W that make up the motor relay 222. It has the function of protecting against electromotive force.
  • FIG. 4 is a diagram illustrating the above protection function. Note that when the protection function operates, the semiconductor switching elements UH, UL, VH, VL, WH, WL forming the three-phase bridge inverter 245A and the semiconductor switching elements 222U, 222V, 222W forming the motor relay 222, Controlled to off state.
  • the back electromotive force generated by the motor 220 is applied to the semiconductor switching elements UH, UL, VH, VL, WH, and WL of the three-phase bridge inverter 245A.
  • the semiconductor switching elements UH, VH, and WH of the upper arm of the three-phase bridge inverter 245A have parasitic diodes D1, D3, and D5, and the anodes of the parasitic diodes D1, D3, and D5 are connected to the ground GND, and the parasitic The cathodes of diodes D1, D3, and D5 are connected to system power supply 246. Therefore, even if the upper arm semiconductor switching elements UH, VH, WH are in the off state, the back electromotive force will flow to the drains of the semiconductor switching elements UH, VH, WH via the parasitic diodes D1, D3, D5. become.
  • the back electromotive force is applied to the smoothing capacitor C1 provided in parallel with the three-phase bridge inverter 245A, and charges the capacitor C1. Therefore, even if a back electromotive force is generated in the motor 220, a high load is prevented from being applied to the semiconductor switching elements UH, UL, VH, VL, WH, WL of the three-phase bridge inverter 245A, and the semiconductor switching elements UH, UL , VH, VL, WH, and WL are prevented from being damaged by back electromotive force.
  • the back electromotive force generated in the motor 220 is blocked by the drains of the semiconductor switching elements 222U, 222V, and 222W of the motor relay 222.
  • the back electromotive force is alternating current and changes instantaneously, the alternating current voltage is blocked by the semiconductor switching element 222U. , 222V, and 222W, and the gate potential becomes the same as the drain potential.
  • the Zener diode ZD1 blocks the current (the direction shown by the dotted line in the figure).
  • this negative voltage exceeds the breakdown voltage of the Zener diode ZD1
  • the voltage is offset by the breakdown voltage, and the gate potentials of the semiconductor switching elements 222U, 222V, and 222W rise.
  • FIG. 5 shows a state in which the gate potentials of the semiconductor switching elements 222U, 222V, and 222W have increased due to the back electromotive force (in other words, negative voltage) generated by the motor 220.
  • the gate potential of the semiconductor switching elements 222U, 222V, 222W rises, a voltage difference occurs between the sources and gates of the semiconductor switching elements 222U, 222V, 222W, so that the semiconductor switching elements 222U, 222V, 222W become conductive (in other words, Then, it becomes on state).
  • the Zener diode ZD1 switches between the semiconductor switching elements 222U, 222V, 222W when the potential on the side of the windings 220U, 220V, 220W of the semiconductor switching elements 222U, 222V, 222W and the potential of the ground GND reach a predetermined potential difference. It functions as a control element that turns on 222W.
  • the Zener diode ZD1 switches the semiconductor switching elements 222U, 222V, 222W when a negative voltage of a predetermined level or more occurs between the windings 220U, 220V, 220W and the semiconductor switching elements 222U, 222V, 222W. Turn on to form a reflux path. By forming such a circulation path, the semiconductor switching elements 222U, 222V, and 222W are protected from back electromotive force.
  • Zener diode ZD1 is used to protect the semiconductor switching elements 222U, 222V, and 222W from back electromotive force, there is no need to control the on/off of the elements to achieve the protection function, and the system can be Even in this state, the semiconductor switching elements 222U, 222V, and 222W can be protected from back electromotive force. Further, since no control operation is required to implement the protection function, there is no need for logic to be controlled by software processing.
  • a failure mode of the Zener diode ZD1 is a short-circuit failure, that is, a state in which the Zener diode ZD1 flows a current in the opposite direction at a voltage lower than that in a normal state.
  • a redundant motor control device means, for example, that the motor 220 has a first winding set and a second winding set, and a first drive system that controls power supply to the first winding set, and a first drive system that controls power supply to the first winding set.
  • the motor control device includes a second drive system that controls power supply to two winding sets. In other words, this is a system that includes the circuit shown in FIG. 2 in duplicate.
  • the rotation of the motor 220 changes. Accordingly, a back electromotive force is generated in the first winding set.
  • the Zener diode ZD1 of the first system is short-circuited, a current due to the back electromotive force flows in the motor 220, and the current due to the back electromotive force conflicts with the energization control by the second system. Braking torque may be generated in the system.
  • the motor control device 260 includes a Zener diode diagnostic section 239, which is a functional section that diagnoses whether or not the Zener diode ZD1 has a failure.
  • the Zener diode diagnostic unit 239 performs diagnosis from the diagnostic voltage output circuit 237 while the motor drive is stopped, that is, the three-phase bridge inverter 245A and the motor relay 222 are in the off state. output voltage.
  • the diagnostic voltage output by the diagnostic voltage output circuit 237 is applied to the gates of the semiconductor switching elements 222U, 222V, 222W when the Zener diode ZD1 has a short-circuit failure, and is applied to the gates of the semiconductor switching elements 222U, 222V, 222W.
  • the neutral point voltage monitoring circuit 233 (neutral point voltage monitoring unit) observes the voltage through a source-to-source resistance (not shown). On the other hand, if the Zener diode ZD1 is normal and there is no short-circuit failure, no current will flow through the Zener diode ZD1 and no increase in gate potential of the semiconductor switching elements 222U, 222V, 222W will occur, so the neutral point voltage monitor Circuit 233 does not detect voltage.
  • the Zener diode diagnostic unit 239 determines that the Zener diode ZD1 is normal if the neutral point voltage monitor circuit 233 does not detect a voltage when the diagnostic voltage output circuit 237 outputs the diagnostic voltage. . On the other hand, if the neutral point voltage monitor circuit 233 detects a voltage when the diagnostic voltage output circuit 237 outputs the diagnostic voltage, the Zener diode diagnostic unit 239 determines that a short-circuit failure has occurred in the Zener diode ZD1. .
  • the voltage output diagnosis section 240 diagnoses whether or not the diagnostic voltage output circuit 237 has a failure.
  • Voltage output diagnosis section 240 outputs a diagnostic voltage from diagnostic voltage output circuit 237 when motor drive is stopped, that is, when three-phase bridge inverter 245A and motor relay 222 are off.
  • the voltage output diagnostic unit 240 determines that the diagnostic voltage output circuit 237 is normal, and the voltage monitor circuit 235 detects the diagnostic voltage. If not detected, it is determined that a failure has occurred in the diagnostic voltage output circuit 237. Further, the voltage output diagnosis unit 240 detects that the diagnostic voltage output circuit 237 has failed if the voltage monitor circuit 235 detects a voltage equal to or higher than the threshold while the diagnostic voltage output circuit 237 is not outputting the diagnostic voltage. If it is determined that the voltage detection value by the voltage monitor circuit 235 is less than the threshold value, it can be determined that the diagnostic voltage output circuit 237 is normal.
  • FIG. 6 is a flowchart showing a procedure for diagnosing the Zener diode ZD1 and the diagnostic voltage output circuit 237.
  • the control device 230 causes the diagnostic voltage output circuit 237 to stop outputting the diagnostic voltage.
  • the control device 230 determines whether the voltage monitor circuit 235 has detected a voltage equal to or higher than the first threshold value.
  • the control device 230 causes the diagnostic voltage output circuit 237 to output a diagnostic voltage. It is determined that the state is not commensurate with the output stop command, and the process proceeds to step S503, where it is determined whether or not a failure has occurred in the diagnostic voltage output circuit 237.
  • step S502 determines in step S502 that the voltage detected by the voltage monitor circuit 235 is less than the first threshold.
  • the control device 230 proceeds to step S504.
  • step S504 the control device 230 causes the diagnostic voltage output circuit 237 to output a diagnostic voltage.
  • step S505 the control device 230 determines whether the voltage monitor circuit 235 has detected a voltage equal to or higher than the second threshold (second threshold ⁇ first threshold).
  • the control device 230 determines that the diagnostic voltage output circuit 237 is not outputting a regular diagnostic voltage in response to the output command. Then, the process proceeds to step S506, and it is determined whether a failure has occurred in the diagnostic voltage output circuit 237.
  • step S507 the control device 230 determines whether the neutral point voltage monitor circuit 233 is detecting voltage while the diagnostic voltage output circuit 237 is outputting the diagnostic voltage.
  • step S508 determines whether a failure of the Zener diode ZD1 has occurred, specifically, whether a short circuit failure has occurred. On the other hand, if the neutral point voltage monitor circuit 233 does not detect any voltage, the control device 230 determines that the Zener diode ZD1 is normal and ends this diagnostic routine.
  • the electric steering device to which the motor control device 260 is applied is the electric power steering device 200, but the electric steering device is an electric power steering device where the steering wheel 201 and the wheels 110, 110 are mechanically connected
  • the electric steering device can be a steer-by-wire steering device in which the steering wheel 201 and the wheels 110, 110 are not mechanically connected, and the motor generates the steering force to steer the wheels 110, 110.
  • SYMBOLS 100... Vehicle, 110... Wheel, 200... Electric power steering device (electric steering device), 220... Motor, 220U, 220V, 220W... Winding wire, 222... Motor relay, 222U, 222V, 222W... Semiconductor switching element, 223... Signal path, 224... Ground path, 230... Control device (control unit), 245... Drive circuit, 245A... Three-phase bridge inverter, 260... Motor control device, ZD1... Zener diode (control element), D11... Diode

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Power Steering Mechanism (AREA)

Abstract

Un dispositif de commande de moteur et un dispositif de direction électrique selon la présente invention comprennent : un circuit d'entraînement pour un moteur ; un élément de commutation à semi-conducteur qui connecte et déconnecte un trajet de conduction entre le circuit d'entraînement et un point neutre d'un ensemble d'enroulements multiphase du moteur ; une unité de commande qui commande le circuit d'entraînement et l'élément de commutation à semi-conducteur ; et un élément de commande qui est placé dans un trajet de masse connectant un trajet de signal pour un signal de commande de l'élément de commutation à semi-conducteur à la masse et qui active l'élément de commutation à semi-conducteur lorsqu'une différence de potentiel prédéterminée est atteinte entre le potentiel sur le côté enroulement de l'élément de commutation à semi-conducteur et le potentiel de la masse. Ainsi, il est possible d'empêcher que l'élément de commutation à semi-conducteur ne soit endommagé par la tension contre-électromotrice du moteur.
PCT/JP2023/030676 2022-09-13 2023-08-25 Dispositif de commande de moteur et dispositif de direction électrique WO2024057878A1 (fr)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2022094457A (ja) * 2020-12-15 2022-06-27 日立Astemo株式会社 モータ駆動制御装置

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2022094457A (ja) * 2020-12-15 2022-06-27 日立Astemo株式会社 モータ駆動制御装置

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