Method and device for obtaining AC motor insulation resistance based on AC injection method
An AC injection method and AC motor technology, applied in the direction of measuring resistance/reactance/impedance, measuring devices, measuring electrical variables, etc., can solve problems such as inability to obtain AC motor insulation resistance, safety risks, etc.
Active Publication Date: 2021-02-19
CONTEMPORARY AMPEREX RUNZHI SOFTWARE TECH LTD NINGDE CITY
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[0006] In view of this, an embodiment of the present invention provides a method and device for obtaining insulation resistance of an AC motor based on an AC injection method to solve the problem that the insulation detection method in the prior art cannot obtain the insulation resistance of an AC motor and further cause security risk issues
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Embodiment 1
[0065] An embodiment of the present invention provides a method for obtaining insulation resistance of an AC motor based on an AC injection method.
[0066] First, please refer to figure 1 , which is a schematic flowchart of a method for obtaining insulation resistance of an AC motor based on an AC injection method provided by an embodiment of the present invention, and the method includes the following steps:
[0067] S101. When the AC motor is in a non-working state and a working state respectively, collect electrical signals through an insulation resistance acquisition circuit.
[0068] The AC motor involved in the embodiment of the present invention may include but not limited to: an AC generator or an AC motor.
[0069] S102. Obtain a parallel equivalent impedance corresponding to the state according to the collected electrical signal.
[0070] S103. Obtain the insulation resistance of the AC motor according to the parallel equivalent impedance corresponding to the work...
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Embodiments of the present invention provide a method and device for obtaining insulation resistance of an AC motor based on an AC injection method. In the embodiment of the present invention, when the AC motor is in the non-working state and the working state, respectively, the electrical signal is collected through the insulation impedance acquisition circuit, and then, according to the collected electrical signal, the parallel equivalent impedance corresponding to the state is obtained, and then, The insulation resistance of the AC motor is obtained according to the parallel equivalent impedance corresponding to the working state and the parallel equivalent impedance corresponding to the non-working state. Therefore, the technical solutions provided by the embodiments of the present invention can solve the problem that the insulation detection method in the prior art cannot obtain the insulation resistance of the AC motor and further cause safety risks.
Description
【Technical field】 [0001] The invention relates to the field of battery technology, in particular to a method and device for obtaining insulation resistance of an AC motor based on an AC injection method. 【Background technique】 [0002] The replacement of fuel vehicles by electric vehicles has become the development trend of the automobile industry. The mileage, service life and safety of power batteries are all very important to the use of electric vehicles. As one of the evaluation indicators of safety performance, insulation performance is an indispensable testing item in power batteries. During the operation of the AC motor, due to the joint effect of various factors such as electromagnetic force, mechanical force, and electrochemistry, the insulation performance of the AC motor will be reduced, and even the insulation failure of the AC motor will be caused. This will cause a major safety hazard to the normal start-up and work of the AC motor, even the personal safety of...
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IPC IPC(8): G01R27/02
CPCG01R27/02
Inventor 李盟但志敏张伟侯贻真颜利丹
Owner CONTEMPORARY AMPEREX RUNZHI SOFTWARE TECH LTD NINGDE CITY