中文摘要：

基于人工心脏用电机的可植入性强、高血液相容性的特殊要求,提出了一种新型的应用于人工心脏的无轴承永磁无刷直流电动机的设计方案。利用图示法和公式法分析了分数槽绕组降低永磁电机齿槽转矩的机理,在先前研制的12/4整数槽电机的基础上,采用6/4分数槽绕组结构进一步降低齿槽转矩,应用Ansoft有限元软件进行两种电机模型的电磁场性能对比分析,仿真结果表明,新设计的6/4分数槽绕组电机,齿槽转矩脉动降为原先电机的10.0%,反电动势平顶宽度增加30.0%。基于人体血液循环系统的水力模拟实验表明,在额定转速下分数槽电机效率提高11.3%,进出口平均压差增大12.9%。

英文摘要：

Aiming at high implantability and hemocompatibility of the artificial hearts,a new design of a non- bearing permanent magnet brushless DC motor for an artificial heart was proposed. Firstly,graphical and formulas methods were used to analyze of the mechanism of fractional slot windings to reduce the cogging torque of permanent magnet motor. On the basis of the 12 /4 integer slot motor developed by the authors previously,a motor with 6 /4 fractional slot winding structure motor was introduced to reduce the cogging torque. Secondly,the electromagnetic performance of the two motors were analyzed and compared using Ansoft finite element software. The numerical results show that the back electromotive force flat width of the motor adopting 6 /4 fractional slot winding structure increased by 30. 0%,with the cogging torque only about 10.0% of the latter. The experiments of the prototype in the artifical heart hydraulic circulatory loop show that the efficiency of fractional slot motor increased by 11. 3%,and the average differential pressure increased by 12. 9% at the rated rotate speed.