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Adaptive Control of Surge Impedance for Electric Motors in Motor Drive Systems

Fahmid SadequeFariba FatehJiangBiao HeBehrooz Mirafzal
Dec 2022
摘要
This article studies the possibility of controlling the surge impedance ofthe electric motor in motor drives. The existing solution to suppress (oreliminate) the reflected wave impact on the motor insulation run by a Si-IGBTor SiC-MOSFET-based drive is to use either a sinewave filter or dv/dt filter.The alternative solution suggested in this article is to implement ahigh-bandwidth electronic circuit at the end of the cable or at the motorterminals to match the surge impedance of the cable and motor. Thehigh-frequency voltage ringing due to the reflected waves in motor drives isaround 1 MHz, depending on the cable parameters and the length of the cable. Inthe proposed method, the electronic circuit can quickly detect the dv/dt riseand fall edges and adjust the electronic circuit equivalent impedance whenpulses arrive the motor terminals. Thus, the cable and motor surge impedancescan be matched over a short time to prevent reflected waves. As a result, theleakage currents passing through the ball bearing and overvoltage stress on themotor insulation can be suppressed significantly.
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