# US 11,299,062 B2 · Motor drive device

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- Number: US 11,299,062 B2
- Document ID: US11299062B2
- Status: Granted
- Kind: B2
- Application number: 15/250,172
- Filed: 2016-08-29
- Published: 2017-09-14
- Granted: 2022-04-12
- Earliest claimed: 2016-03-10
- Assignees: Mitsubishi Electric Corporation
- Applicants: Mitsubishi Electric Corporation
- Inventors: Yasukazu Murata; Keiichi Enoki; Masutaka Watanabe; Shingo Harada; Yoshimasa Nishijima
- Web page: https://patentgrep.com/patent/US11299062B2

## CPC

- B60L 58/12: responding to state of charge [SoC]
- B60L 7/003: {Dynamic electric braking by short circuiting the motor}
- B60L 50/51: characterised by AC-motors
- B60W 10/08: including control of electric propulsion units, e.g. motors or generators
- B60W 20/10: Controlling the power contribution of each of the prime movers to meet required power demand
- B60W 20/50: Control strategies for responding to system failures, e.g. for fault diagnosis, failsafe operation or limp mode
- H02P 3/22: by short-circuit or resistive braking
- H02P 25/22: Multiple windings; Windings for more than three phases
- H02P 27/08: with pulse width modulation
- H02P 29/0241: {the fault being an overvoltage}
- H02P 29/032: Preventing damage to the motor, e.g. setting individual current limits for different drive conditions
- B60L 2210/30: AC to DC converters
- B60L 2210/40: DC to AC converters
- H02H 7/0833: {for electric motors with control arrangements}
- H02H 7/1225: {responsive to internal faults, e.g. shoot-through (avoiding shoot-through H02M1/38)}
- Y02T 10/62: Hybrid vehicles
- Y02T 10/64: Electric machine technologies in electromobility
- Y02T 10/70: Energy storage systems for electromobility, e.g. batteries
- Y02T 10/72: Electric energy management in electromobility
- Y10S 903/906: Motor or generator
- B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60W: CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02H: EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS (indicating or signalling undesired working conditions G01R, e.g. G01R31/00, G08B; locating faults along lines G01R31/08; emergency protective devices H01H)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

MCU (2001) determines whether at least one of double three-phase inverter (2030) or battery (2002) has a failure, or battery (2002) is fully charged, and switches control to be performed in inverter (2030) between all-phase shut off and three-phase short circuit based on a motor rotation speed of double three-phase motor (2050) when MCU (2001) determines that any one of inverter (2030) and battery (2002) has a failure, or battery (2002) is fully charged. Battery (2002) and inverter (2030) can be protected when current is inhibited from flowing from motor (2050) to battery (2002) due to a failure of inverter (2030) or battery (2002).

## Claims

### Claim 1

A motor drive device to be mounted on a vehicle including an engine and a motor directly coupled to each other,
the vehicle comprising a DC power supply device that is configured to supply electric power to the motor, and is charged by output of the motor,
the motor drive device comprising:
an inverter configured to convert DC electric power supplied from the DC power supply device into AC electric power, and to convert AC electric power obtained from, the motor to DC electric power; and
a control device configured to control the inverter,
the control device comprising:
a DC power supply state determination unit configured to determine whether or not the DC power supply device is fully charged, to thereby determine whether or not current is inhibited from flowing from the motor to the DC power supply device; and
a switching unit configured to, in response to the DC power supply state determination unit determining that the current is inhibited from flowing from the motor to the DC power supply device, select a control to be performed in the inverter from all-phase shut off and three-phase short circuit based on one of a motor rotation speed of the motor, and an induced voltage of the motor and a DC link voltage of the DC power supply device,
wherein the switching unit is configured to:
perform the all-phase shut off in the inverter when the induced voltage of the motor is equal to or less than the DC link voltage; and
perform the three-phase short circuit in the inverter when the induced voltage of the motor is more than the DC link voltage.

### Claim 2 (depends on 1)

The motor drive device according to claim 1, wherein the motor and the inverter configured to drive the motor each comprises a first group having a U phase, a V phase, and a W phase, and a second group having an X phase, a Y phase, and a Z phase, and
wherein the control device further comprises a three-phase short-circuit processing unit configured to, when a reduction amount of three-phase short-circuit torque is equal to or more than a threshold while the inverter is performing the three-phase short circuit, perform control so that one of the first group and the second group performs power running and another one of the first group and the second group performs regeneration, to thereby achieve an increase or a decrease of direct current to zero.