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Method and device for fault diagnosis of DC motor control system

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: 2018-12-25
GREE ELECTRIC APPLIANCES INC
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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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  • Method and device for fault diagnosis of DC motor control system
  • Method and device for fault diagnosis of DC motor control system
  • Method and device for fault diagnosis of DC motor control system

Examples

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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 with reference to the accompanying drawings.

[0034] The fault diagnosis method of the DC motor control system 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 the inverter, air conditioner, and inverter compressor used in the refrigerator, and the DC fan motor.

[0035] This method requires that a simple motor control system can 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 one that can be set and detected To phase current overcurrent signal (F O ) Of the circuit. Among them, the auxiliary circuit of the DC motor is required to include: fault display and WIFI sending module.

[0036] The present inv...

Embodiment 2

[0067] Based on the DC motor control system fault diagnosis method provided in the foregoing embodiment 1, optional embodiment 2 of the present invention also provides a DC motor control system fault diagnosis device. Specifically, image 3 Shows an optional block diagram of the device, such as image 3 As shown, the device includes: a monitoring unit 32 for controlling the system to enter a fault diagnosis mode in response to a triggered DC motor start command or receiving a system self-checking command; a control acquisition unit 34 for sequentially monitoring the DC motor in the system In the U, V, W three-phase circuit, UV, VW, WU output fixed duty cycle PWM signals, and sample U, V, W three-phase current signals and phase current overcurrent signal F O ;Determining unit 36, used for the three-phase current signal U, V, W and phase current overcurrent signal F O The result status is to determine whether there is a fault in the DC motor control system and the cause of the fault...

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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, and in particular to a method and device for fault diagnosis of 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 and short circuit, and control circuit failure may cause the DC motor control system to malfunction. However, after the DC motor control system fails, it is difficult to know the cause of the failure. The specific reasons often require human experience to make judgments. This judgment method is more complicated and is not conducive to subsequent maintenance and treatment. [0003] Regarding the problem that the DC motor control system (such as the air-conditioning compressor control system) malfunctions in the related art, the specific cause of the malfunction cannot be determined in time, which is not conducive to the maintenance and treatme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/08
CPCH02H7/0838
Inventor 游剑波黄滔梁博
Owner GREE ELECTRIC APPLIANCES INC