Motor grounding fault detection system and method
A ground fault and detection method technology, which is applied in the direction of motor generator testing, measuring electricity, measuring devices, etc., can solve problems such as low safety and low efficiency, and achieve the effect of safe automatic detection and fast automatic detection
Active Publication Date: 2017-01-18
GREE ELECTRIC APPLIANCES INC OF ZHUHAI
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Problems solved by technology
[0002] At present, when judging whether the three-phase winding of the motor including the compressor is in a grounded state, the maintenance personnel directly detect the ground impedance of the terminals of the motor compressor through a multimeter or other detection tools. It can be seen from this that for For motors that have been installed in high places or in dangerous working environments, the existing detection method is inefficient and less safe
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[0056] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0057] Such as figure 1 As shown, it is a flow chart of Embodiment 1 of a motor ground fault detection method disclosed in the present invention, and the method includes the following steps:
[0058] S101. After the motor unit is powered on, generate a first control signal, and charge the motor bus terminal based on the first control signal;
[0059] When it is necessary to detect whether there is a ground fault in the motor, the first control signal is gener...
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The invention discloses a motor grounding fault detection method. The method comprises a step of generating a first control signal after the power-on of a motor set and charging a motor bus end based on the first control signal, a step of judging whether the charging of the motor bus end is completed, generating a second control signal if so, and carrying out bootstrap charging on the upper bridge arm of an inverter bridge in a motor based on the second control signal, a step of judging whether the bootstrap charging is completed, and generating a PWM control signal in a preset time period if so, and controlling the R, S or T phase of the motor based on the PWM control signal, a step of detecting whether detection element corresponding to the R, S or T phase has current in controlling the R, S or T phase of the motor based on the PWM control signal, and generating R, S or T phase grounding short circuit fault information if so. According to the method, the grounding fault of the motor can be fast and safely detected automatically. The invention also discloses a motor grounding fault detection system.
Description
technical field [0001] The invention relates to the technical field of motor fault detection, in particular to a motor ground fault detection method and system. Background technique [0002] At present, when judging whether the three-phase winding of the motor including the compressor is in a grounded state, the maintenance personnel directly detect the ground impedance of the terminals of the motor compressor through a multimeter or other detection tools. It can be seen from this that for For motors that have been installed in high places or in dangerous working environments, the existing detection method is inefficient and less safe. Contents of the invention [0003] The invention provides a method for detecting a grounding fault of a motor. Compared with the prior art, manual detection is not required, and the grounding fault of a motor can be automatically detected quickly and safely. [0004] The present invention provides a motor ground fault detection method, comp...
Claims
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Login to View More IPC IPC(8): G01R31/02G01R31/34
CPCG01R31/343G01R31/50
Inventor 杨帆王衍绪
Owner GREE ELECTRIC APPLIANCES INC OF ZHUHAI