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Method for estimating impendence of common-mode interference noise source of PWM drive motor system

A common-mode interference and drive motor technology, applied in the direction of motor parameter estimation/correction, can solve the problems of high cost, method limitation, and failure to consider the problem of common-mode noise source impedance estimation, etc., to achieve easy operation and great practical value , Estimate the effect of high accuracy

Inactive Publication Date: 2014-07-02
HARBIN ENG UNIV
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Problems solved by technology

None of the above references considers the estimation of common mode noise source impedance
[0006] Zhao Yang, a scholar from Nanjing Normal University, published an invention patent titled "Switching Power Supply EMI Noise Source Internal Impedance Test System and Measurement Method Based on Hilbert Transform and Current Probe", which is mainly aimed at noise sources of switching power supplies (not PWM drive motor systems) Impedance, a new test method is proposed, but this method requires a lot of hardware equipment, the cost is high, and for the three-phase PWM motor drive system, the proposed method will be limited

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  • Method for estimating impendence of common-mode interference noise source of PWM drive motor system
  • Method for estimating impendence of common-mode interference noise source of PWM drive motor system

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Embodiment Construction

[0031] For the three-phase induction motor system, since the common mode interference mainly forms an interference loop through each phase line, parasitic capacitance to ground and ground, the loop model is as follows figure 1 shown. The internal structure of the loop model is complex, and the frequency spectrum of the electromagnetic noise source is relatively rich, so it is often difficult to obtain the impedance of the common mode noise source. However, the size of the common-mode noise source impedance is related to the selection of the filter topology, which is very important to the realization of the electromagnetic compatibility of the motor drive system, so the application of the present invention estimates the value of the noise source impedance to solve the problem that the common-mode noise source impedance is unknown and affects the filtering problem of device design.

[0032] The invention estimates the value range of the common mode noise source impedance accord...

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Abstract

The invention relates to a method for estimating the impendence of a common-mode interference noise source of a PWM drive motor system. The method for estimating the impendence of the common-mode interference noise source of the PWM drive motor system is characterized in that an impedor with a known impendence value is inserted in a circuit, and the value range of the impendence of the common-mode interference noise source is estimated according to insertion losses.

Description

technical field [0001] The invention relates to a method for estimating source impedance of common-mode interference noise in a PWM drive motor system. Background technique [0002] Due to the modern motor system using PWM technology, the power electronic devices are in the switching state, which causes serious conducted electromagnetic interference, especially common-mode interference. The passive filter is an effective and common method to suppress common-mode interference, but the performance of the EMI filter is closely related to the noise source impedance, and the estimation of the noise source impedance is the prerequisite for selecting the EMI filter topology. [0003] According to literature and patent searches, there are some literatures currently researching the suppression of common-mode interference. Yuan Peng from Huazhong University of Science and Technology and Jiang Baojun from Harbin Institute of Technology mainly studied the suppression method of common-m...

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Application Information

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IPC IPC(8): H02P23/14
Inventor 孙亚秀姜庆辉孙睿峰朱太平卓庆坤李千
Owner HARBIN ENG UNIV
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