This paper presents a motor surge voltage suppression system that utilizes a newly developed surge suppression cable. A feature of this system is that the surge suppression cable is connected in parallel with the motor terminal; the surge suppression cable is independent from the main cable, which is connected between the inverter and the motor. The advantage of this method is that the current capacity of the surge suppression cable does not get influenced by the power capacity of the motor drive system. A mechanism of the motor surge suppression on the present system is demonstrated, and also the numerical equation for motor surge voltage is derived by taking the surge voltage transmission phenomenon on the cables into account. The calculated results are verified through the 750W ac drive experimental setup.
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