摘要
针对单相无刷直流电机的不对称结构造成的电机双向起动能力不同的问题,结合齿槽转矩及电磁转矩的建模分析,提出了一种起动控制策略。建立了具有渐变气隙的单相无刷直流电机的模型,基于能量法推导出了齿槽转矩的表达式,采用偏微分的方法推导出了电磁转矩的表达式,通过有限元分析验证了表达式的准确性。从转矩做功、动能变化的角度对电机双向起动过程进行了理论分析,得出了电机双向起动能力的差异性及产生机理,提出了一种转子重定位的起动控制策略,在搭建的单相无刷直流电机实验平台上验证了理论的正确性及控制策略的有效性。齿槽转矩及电磁转矩的离散化模型适用于计算机快速求解,转子重定位的控制策略能够解决单相无刷直流电机无法反向起动的问题。
Aiming at the difference in bidirectional start-up capability caused by the asymmetric body structure of single-phase brushless DC motor(SPBLDCM),combined with cogging torque and electromagnetic torque modeling analysis,a start-up control strategy was proposed.A model of SPBLDCM with a tapered air gap was established,the expression of cogging torque was derived based on the energy method,and the expression of electromagnetic torque was derived by partial differential method.The accuracy of the expressions was verified by finite element analysis.From the perspectives of torque work and kinetic energy change,the bidirectional start-up process was analyzed theoretically,the difference and the generating mechanism of bi-directional start-up capability were obtained,and a start-up control strategy for rotor repositioning was proposed.The validity of the theory and the effectiveness of the control strategy were verified on a SPBLDCM experimental platform.Discrete models of cogging torque and electromagnetic toque are suitable for rapid computer solution.The control strategy for rotor repositioning can solve the problem that SPBLDCM cannot start in the reverse direction.
作者
周子馨
章玮
ZHOU Zi-xin;ZHANG Wci(Colege of Electrical Ennineerinn,Zhejiang University,Hangzhou 310027,China)
出处
《电机与控制学报》
EI
CSCD
北大核心
2020年第5期1-9,共9页
Electric Machines and Control
基金
浙江省自然科学基金(LY19E070005)
关键词
解析模型
有限元分析
电机控制
单相无刷直流电机
齿槽转矩
电磁转矩
起动
analytical models
finite element analysis
electric machine control
single-phase brushless DC motors
cogging torque
electromagnetic torque
start-up
