超强型齿层永磁混合式步进电机结构原理及性能分析

结合定子永磁混合式步进电机和超强型混合式步进电机结构及性能优点，提出一种仅在定转子齿层放置永磁磁条的超强型齿层永磁混合式步进电机，具有定转子结构简单、转矩和功率密度高、电磁场二维分布、设计分析计算方便等特点。针对电机结构特征、运行原理及转矩提升机制进行理论分析。基于归一化分析方法和二维有限元计算，探究齿高、齿宽、齿距、气隙等齿层参数变化对空载反电势、定位转矩、输出转矩、转矩脉动、保持转矩等电机性能的影响规律，提出该类电机齿层参数优化设计准则。将同规格定子轭部永磁混合式步进电机、定子齿层永磁混合式步进电机与所提出的超强型齿层永磁混合式步进电机进行性能比较研究，验证了理论分析的正确性及新型电机结构性能的优越性。

Structure Principle and Performance Analysis of Super Tooth-layer- Permanent-magnet Hybrid Stepping Motor

Combining the structure and performance advantages of stator-permanent-magnet hybrid stepping motor and super hybrid stepping motor,a super tooth-layer-permanent-magnet hybrid stepping motor was proposed,in which permanent magnetic strips were placed merely in stator and rotor tooth-layer slots.It is characterized by the simple stator and rotor structure,high torque and power density,2D distributed electromagnetic field,as well as convenient design,analysis and calculation.The structural characteristics,operation principle and torque raising mechanism of the motor were analyzed theoretically.Based on the normalized analysis method and 2D finite element calculation,the influence of tooth-layer parameters variation such as tooth height,tooth width,tooth pitch and air gap on the motor performance such as no-load back EMF,detent torque,output torque,torque ripple and holding torque was explored,and the tooth-layer parameters optimization design criteria of this kind of motor were proposed.Moreover,performance comparisons of the stator- yoke permanent magnet hybrid stepping motor,the stator tooth-layer-permanent-magnet one and the proposed super tooth-layer-permanent-magnet one with the same specifications were carried out.The results verify the correctness of the theoretical analysis and the superiority of both structure and performance of the newly proposed motor.