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Direct-current motor control system fault diagnosis method and device

A technology of DC motors and control systems, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve problems such as unfavorable maintenance and treatment, and achieve the effect of improving maintenance efficiency

Active Publication Date: 2016-07-27
GREE ELECTRIC APPLIANCES INC OF ZHUHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a fault diagnosis method and device for a DC motor control system to at least solve the problem in the prior art that a fault occurs in a DC motor control system and the specific cause of the fault cannot be judged in time, which is not conducive to maintenance and treatment

Method used

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  • Direct-current motor control system fault diagnosis method and device

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Embodiment 1

[0033] The fault diagnosis method of the DC motor control system provided by the present invention will be described below in conjunction with the accompanying drawings.

[0034] The DC motor control system fault diagnosis method provided by the present invention can be applied to the fault diagnosis of the brushless DC motor control system, for example, including the fault diagnosis of frequency converters, air conditioners, frequency conversion compressors used in refrigerators, DC fan motors and other systems.

[0035] This method requires that the simple motor control system may include: a main control circuit for generating PWM signals, an intelligent power module (IPM) or a circuit that can achieve the same function, a set of compressor phase current detection circuits, and a set and detection circuit. to the phase current overcurrent signal (FO ) circuit. Among them, the DC motor auxiliary circuit is required to include: fault display, WIFI sending module.

[0036] The...

Embodiment 2

[0067] Based on the DC motor control system fault diagnosis method provided in Embodiment 1 above, the optional Embodiment 2 of the present invention also provides a DC motor control system fault diagnosis device, specifically, image 3 shows an optional structural block diagram of the device, such as image 3 As shown, the device includes: a monitoring unit 32, which is used to control the system to enter the fault diagnosis mode in response to a triggered DC motor startup command or receiving a system self-test command; In the U, V, W three-phase circuit, UV, VW, and WU output fixed duty cycle PWM signals, and sample U, V, W three-phase current signals and phase current overcurrent signal F O ; Determine unit 36, for according to U, V, W three-phase current signal and phase current overcurrent signal F O The resulting status of the DC motor control system to determine if there is a fault and the cause of the fault.

[0068] Further, as Figure 4 As shown, the determinatio...

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Abstract

The invention discloses a direct-current motor control system fault diagnosis method and device, wherein the method comprises the steps that: responding to a triggered direct-current motor starting instruction or receiving a system self-checking instruction, a control system enters a fault diagnosis mode; a fixed duty ratio PWM signal is output for UV, VW and WU in U, V and W three phases of circuits of the direct-current motor in the system, and U, V and W three phases of current signals and a phase current overcurrent signal FO are sampled; according to the result states of the U, V and W three phases of current signals and the phase current overcurrent signal FO, whether the direct-current motor control system has faults and the fault reasons are determined. According to the invention, the direct-current motor control system fault diagnosis method and device solve the problems in the prior art the specific reasons of faults cannot be judged in time when the direct-current motor control system has faults which is bad for maintenance processing, so that the maintenance efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of DC motor control circuits, in particular to a fault diagnosis method and device for a DC motor control system. Background technique [0002] The application scenarios of the existing DC motor control system are relatively complicated. System blockage, electrical open-short circuit and control circuit failure may cause the DC motor control system to fail. However, after the DC motor control system fails, it is difficult to know the cause of the failure. The specific reasons often need to be judged by human experience. This judgment method is relatively complicated and is not conducive to subsequent maintenance and treatment. [0003] Aiming at the problem in the related art that the failure of the DC motor control system (such as the control system of the air-conditioning compressor) fails to determine the specific cause of the failure in time, which is not conducive to maintenance and treatment, no effect...

Claims

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Application Information

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IPC IPC(8): H02H7/08
CPCH02H7/0838
Inventor 游剑波黄滔梁博
Owner GREE ELECTRIC APPLIANCES INC OF ZHUHAI