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Motor drive device

A driving device and motor technology, which is applied in the direction of AC motor deceleration device, power consumption device, motor control, etc., and can solve problems such as voltage rise, battery failure, overvoltage drop, etc.

Active Publication Date: 2017-09-19
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the conventional motor drive device mounted on the vehicle adopting the above-mentioned structure, the motor does not drive, and if it is in the power generation state, problems such as the following occur: the battery fails, or the connector that connects the motor drive device to the battery is disconnected, Or a circuit breaker inserted between the connectors becomes open, and a sudden voltage rise occurs in the charging path of the control circuit of the motor drive device.
In Patent Document 1, when the overvoltage judging unit judges that there is an overvoltage, the power conversion device is controlled so that the rotating electrical machine is in a phase-short-circuit state, so that a short-circuit current flows through the rotating electrical machine, thereby suppressing the highest value of the overvoltage, And make the overvoltage drop rapidly

Method used

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Examples

Experimental program
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Embodiment approach 1

[0046] image 3 It is a flowchart of processing for judging permission / permission of PWM control in the motor drive device according to Embodiment 1 of the present invention. That is to say, MCU2001 passes image 3 The procedure of processing is used to determine whether the dual three-phase inverter 2030 performs PWM control. MCU 2001 has a memory (not shown), and stores a PWM enable / disable flag in the memory. MCU2001 based on image 3 According to the judgment result in the process, the PWM permission / disallow flag stored in the memory is set to allow or not. image 3 The processing of the flowchart is performed in a failure judgment unit (not shown) provided in MCU2001. Next, detailed description will be given.

[0047] First, in step S3001, the MCU 2001 judges whether the dual three-phase inverter 2030 fails. The failure of the dual three-phase inverter 2030 is considered to be, for example, a failure of the current sensor 2004, a failure of the voltage sensor 2032,...

Embodiment approach 2

[0084] Figure 5 It is a flowchart of processing for switching and executing all-phase disconnection, three-phase short-circuit, and PWM based on various conditions in the motor drive device according to Embodiment 2 of the present invention. Figure 5 The processing of the flowchart is executed by a switching unit (not shown) provided in the MCU 2001 . Other configurations and operations are the same as those in Embodiment 1.

[0085] Figure 5 Steps S5001, S5002, S5004, S5101, S5201 in the Figure 4 Steps S4001, S4002, S4004, S4101, and S4201 are the same, so their descriptions are omitted here.

[0086] In the present embodiment, in step S5003 , MCU 2001 determines whether or not the induced voltage of dual three-phase motor 2050 is equal to or less than a preset second threshold value. If the induced voltage is not below the second threshold, proceed to step S5101, perform a process of becoming a three-phase short circuit, and end Figure 5 process of processing. If ...

Embodiment approach 3

[0091] Figure 6 It is a flowchart of a process of switching and executing all-phase disconnection, three-phase short-circuit, and PWM based on various conditions in the motor drive device for a vehicle according to the embodiment of the present invention. Figure 6 The processing of the flowchart is executed by a switching unit (not shown) provided in the MCU 2001 . Other configurations and operations are the same as those in Embodiment 1 or 2 above.

[0092] Figure 6 Steps S6001, S6002, S6004, S6101, S6201 in the Figure 4 Steps S4001, S4002, S4004, S4101, and S4201 are the same, so their descriptions are omitted here.

[0093] In the present embodiment, in step S6003, MCU 2001 obtains the estimated induced voltage of dual three-phase motor 2050, and determines whether the estimated induced voltage is equal to or less than a predetermined third threshold value. If the estimated induced voltage is not less than the third threshold, proceed to step S6101, perform a proces...

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PUM

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Abstract

In a motor drive device, battery and inverter can be protected when current is inhibited from flowing from motor to battery due to a failure of inverter or battery. 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 and inverter can be protected when current is inhibited from flowing from motor to battery due to a failure of inverter (2030) or battery.

Description

technical field [0001] The present invention relates to a motor drive device, in particular to a motor drive device that selects and switches between a three-phase short circuit and an all-phase open circuit based on the motor speed or the induced voltage of the motor. Background technique [0002] In recent years, hybrid vehicles and electric vehicles have attracted attention as vehicles that take energy saving and the environment into consideration. A hybrid vehicle uses an electric motor as a power source in addition to an existing engine. In addition, electric vehicles use electric motors as power sources. Both hybrid vehicles and electric vehicles use inverter circuits to convert DC power stored in batteries into AC power to drive electric motors for driving. [0003] In addition, in a hybrid vehicle, a motor generator having a function of generating electricity is provided. The motor generator uses the rotational energy generated when the engine is driven to generat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L3/00B60L11/02B60L50/10B60L50/15
CPCB60L50/10B60L3/003B60L3/0046H02P25/22H02P3/22H02P29/032B60L50/51B60L58/12H02P29/0241H02H7/1225B60L2210/30B60L2210/40H02H7/0833Y10S903/906B60W20/50Y02T10/62Y02T10/64Y02T10/70Y02T10/72B60L7/003B60W10/08B60W20/10H02P27/08
Inventor 村田泰一榎木圭一渡边益崇原田信吾西岛良雅
Owner MITSUBISHI ELECTRIC CORP
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