自起动永磁同步电动机齿槽转矩的研究

永磁电机中永磁体与有槽电枢铁心之间相互作用,产生齿槽转矩,引起电机振动和噪声.该文提出了一种针对自起动永磁同步电动机的解析分析方法,得到了齿槽转矩的解析表达式.基于所导出的表达式,根据产生机理的不同,将齿槽转矩各分量分为4类,对各类齿槽转矩的特点进行了分析,并研究了斜槽对各类齿槽转矩的影响,研究表明：与表面式永磁电机不同的是,在自起动永磁同步电动机中采用斜槽的方法不能消除所有的齿槽转矩.

STUDY OF COGGING TORQUE IN LINE-START PERMANENT MAGNET SYNCHRONOUS MOTORS

Due to the interaction between the permanent magnet and slotted armature lamination, there exists cogging torque in slotted permanent magnet motors, which may cause noise and vibration. In this paper, a novel method was proposed to analyze the cogging torque for line-start permanent magnet synchronous motors, and the expression of cogging torque was deduced. Being based on expression and the difference of production mechanism, the components of the cogging torque are classified into four classes. The characteristic for every class is analyzed, and effects of skewing are studied. It was shown that not all the cogging torque components in line-start permanent magnet synchronous motor can be eliminated by skewing, which is different from surface-mounted permanent magnet motors.