A method for detecting weak points of drive motor insulation based on the three-curve method
A drive motor and detection method technology, which is applied in the field of detection of insulation weak points of new energy vehicle drive motors, can solve the problems of time-consuming and labor-intensive, and cannot meet the requirements of high efficiency of technological development, and achieves reduction of workload, improvement of convenience, and accurate judgment. Effect
Active Publication Date: 2021-11-02
成都大川海沃尔电气科技有限公司
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Problems solved by technology
Usually, a large number of repeated tests are required to compare the PDIV data of different insulation positions, and then judge the weak points of the motor insulation through experience. The conventional method is time-consuming and laborious, and cannot meet the high-efficiency requirements of technological development.
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[0033] like Figure 1 to Figure 4 As shown, the method for detecting weak points of the drive motor insulation based on the three-curve method includes the following steps:
[0034] S1. Under the sinusoidal voltage, detect the partial discharge initiation discharge voltage PDIV of the main insulation of the driving motor, and make the first curve PG for representing the main insulation PDIV according to the obtained PDIV value;
[0035] S2. Under the sinusoidal voltage, detect the partial discharge inception discharge voltage PDIV of the phase-to-phase insulation of the driving motor, and make a second curve PP for representing the phase-to-phase insulation PDIV according to the obtained PDIV value;
[0036] S3. Under repeated pulse voltages with different rise times, detect the partial discharge initiation discharge voltage PDIV of the inter-turn insulation of the driving motor, and make the first PDIV for representing the relationship between the turn-to-turn insulation PDIV...
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The invention discloses a method for detecting the weak point of the driving motor insulation based on the three-curve method, which includes detecting the main insulation PDIV and the interphase insulation PDIV of the driving motor under a sinusoidal voltage to form a curve PG and a curve PP, and repeated pulses at different rise times The inter-turn insulation PDIV of the drive motor is detected under voltage and combined with the rise time fitting to form a curve TT, and then the three curves PG, PP, and TT are integrated to form a comparison model based on the relationship between PDIV value and rise time. In the actual detection of weak insulation of the drive motor Through the intuitive comparison of the actual operating parameters in the comparison model, it is convenient to judge the insulation weakness of the drive motor, and provide accurate and reliable guarantee for the subsequent insulation optimization design. Moreover, compared with the previous detection methods, the present invention significantly reduces the workload of insulation PDIV testing, and also makes the positioning detection of weak points of the driving motor insulation more standardized and reliable.
Description
technical field [0001] The invention relates to the technical field of testing and discriminating weak points of insulation of variable frequency motors, in particular to a method for detecting weak points of insulation of driving motors of new energy vehicles based on three curves. Background technique [0002] In recent years, due to the intensification of the global energy crisis and the deterioration of the climate, countries around the world have invested a lot of science and technology and capital in the research, development and production of new energy vehicles. New energy vehicle drive motors have the advantages of high energy efficiency, easy speed regulation, and easy start-up. Different from traditional three-phase AC motors driven by power frequency sinusoidal voltage, new energy vehicle drive motors need to withstand high-frequency, fast-changing pulse width modulation voltage (PWM) during operation, which affects the insulation performance of new energy vehicl...
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IPC IPC(8): G01R31/12G01R31/52G01R31/72
CPCG01R31/1227G01R31/1272G01R31/52G01R31/72
Inventor 王鹏刘新霆程驰宙师洋郭厚霖陈逸雯
Owner 成都大川海沃尔电气科技有限公司