Abstract
Wide band gap devices enable motor inverter to work at very high switching frequency. Increased switching frequency will significantly improve the control performance of the high speed permanent magnet synchronous machine (HSPMSM). However, in order to keep the low cost of the whole system, in many cases, the micro controller (MCU) used for motor control has limited performance, and the control frequency can not follow the increased switching frequency. In order to improve the control performance of HSPMSM with a low cost MCU, a novel low control frequency current control strategy for HSPMSM is proposed in this paper. The proposed strategy changes the PWM duty ratio of each half switching period to make the inverter's output voltage as closer to the reference voltage as possible. Through proposed strategy, the high switching frequency is fully utilized at low control frequency and the similar current steady state control effect as when using high control frequency is achieved. Relevant simulations are carried out to validate the proposed control strategy.
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