摘要：通过一个九相无刷直流电机绕组分别采用封闭形接法或星形接法的例子，分析绕组电感对其机械特性的影响。与星形接法相比，封闭形接法并没有表现特别的优势。探索能够模拟电刷—机械换向器功效的新电子换相电路也许是值得研究的课题。

关键词：无刷直流电动机；多相绕组；封闭形接法；星形接法；机械特性
Abstract:  In this paper, through an example about nine phase windings brushless DC motor with closed connection or star connection , the influence of winding inductance on the mechanical characteristics was analysed. Closed connection showed no special advantage over star connection. It may be worth studying to discover new electronic commutation circuit able to simulate brushmechanical commutator efficacy.

Key words: brushless DC motor；multiphase ；close connection ；star connection ；mechanical characteristics