全部

1·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.

实验结果和理论分析表明永磁涡流制动是一种高效可靠的制动方法。通过与解析法和实验结果的比较，证明用有限元法分析永磁涡流制动的可行性和准确性。