The motor system with the motor, converter and controller is usually called the intergraded motor system[l]. The EMI produced by the integrative motor system becomes serious with the application of the power electronics device. According to analyzing the reason for the formation of common-mode EMI and propagation characteristic, the suppression method is presented by blocking EMI coupling path and the application of terrance generatrix in this paper. Theory analysis adopts the software to simulate surface current and electrical field of heat sink and magnetic field of terrance generatrix. It can prove the method is effective theoretically.
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