High-efficiency Drive Technology for High-speed, Multi-pole Motors with Minor Sampling Process

抄録

Permanent magnet synchronous motors are characterized by their compact form factor and high efficiency. They are increasingly being designed as high-speed, multi-pole motors in response to the demand for higher power density. However, with increasing speed and number of poles, the drive frequency of motors increases, escalating the iron losses. These increased iron losses lead to current detection errors, which may cause a decrease in efficiency.

Considering the influence of current detection errors due to iron loss, this paper proposes a new method that uses minor sampling to perform three-shunt current detection. In addition, to improve the detection accuracy of the proposed approach, we designed a method to suppress the detection error. Experiment results show that the proposed method worked stably even with an RC filter inserted, and the effectiveness of the proposed method was confirmed experimentally.