无换向器电动机是一种新型的可调速电机，其调速性能优于直流调速系统。
No commutator motor is a new variable-speed motor, its adjustable-speed performance is more advantage than dc system.
在无补偿直流牵引电动机中，通常采用主极极弧为圆弧的扩张气隙来改善换向器电位特性。
The opening air-gaps with circular main pole arc are usually used to improve the potential curve of commutator on non-compensable d. c. traction motors.
本文设计了一个不使用位置传感器的无换向器电动机调速系统，采用MCS - 8单片机，实现了无换向器电动机的升降频控制。
A simple brushless motor variable-speed system without position sensors is designed, it is based on MCS-80C196KB and frequency raising-lowering control is realized.
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