The cause of producing the commutation torque ripple was mainly found by means of analyzing the commutation process of permanent magnet brushless DC motor in theory.
主要对永磁无刷直流电动机换相过程进行理论分析，得到引起换相转矩脉动的原因。
2
Compared with the analytical and experimental results, it is confirmed that the permanent magnet eddy-current brake is an effective braking method and FEM is suitable for analyzing it.