According to the mathematical model and torque characteristics of permanent magnet brushless DC motor, the reasons that give rise to torque ripple have been analyzed in this paper.
依据永磁无刷直流电动机的数学模型及其转矩特性，分析了转矩脉动产生的多种原因，并介绍了各种有效的控制策。
The invention has the advantages that: 1. the Curie temperature of the magnet is over 450 DEG C, which is enough to meet the requirement for operation temperature rise of the elevator tractor;
本发明的优点体现在：1。磁体的居里温度大于450 摄氏度，足以抵抗电梯曳引机的工作温升要求；
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