摘 要：无刷直流电动机是近年迅速兴起的一种新型电机，它广泛应用与工业，无刷直流电动机是近年迅速兴起的一种新型电机，它广泛应用与工业，农业，以及军事等领域。 无刷直流电动机既保持了直流电动机良好的调速控制特性，又消除了电刷和换向器的机械接触
对新型电动自行车的关键动力部件---直- I -流无刷电机作了深入的剖析与设计。本文所介绍的电动自行车使用的直流无刷电机，采用电子操纵系统，电动自行车的最高时速可达25km/h，一次充电行程为64km。电电机的功率为220kw，得6kg,效率可达到85,有更小的损耗和杂音.本文提到的电机是方波无刷直流电机，所以也涉及到了其PWM控制器的设计。性能综合指标优于传统的以有刷电机为动力的电动自行车。
关键词：无刷电机；位置传感器；PWM控制器
The design of D.C.Motor without coal brushless
ABSTRACT: Brushless DC motor is rapidly development new motor in the recently, and it widely used in industry、agriculture and in the army. The better governing speed characteristic is kept and the mechanical touch between brushes and commutator is removed as well in brushless DC Motors.
This paper intends to make a better design on the D.C.motor, the key part of the new style electric bicycle, after the detailed analysis. The D.C.motor without coal brushless is in a new style, with higher work rate, less wear and tear and lower noise. This kind of motor discussed in this paper, is operated with electronic system completely, in the speed of 25km per hour, covering the distance of 64km each time it is charged. The motor is 6kg in weight, with the power of 350w and voltage is over the normal levels in the rate close to 85. This kind of motor discussed in this paper also a brushless DC square wave motor. So the design method of controller is also introduced, The comprehensive index of the functions of this kind of motor is much better than of all the traditional ones with coal brushes.
Keywords：Brushless Motor; positional sensor; PWM controller
