小型杆式超声电机及其驱动电源的研究

开发了一种驱动仪表指针用的新型小型杆式超声电机,分析了电机定子等效电路参数的测量方法.为了缩小驱动电源的尺寸,根据谐振升压原理,研制了与该杆式超声电机相匹配的小型无变压器驱动电路.理论分析证明,当选择基波频率驱动、开关信号占空比为0.65时,驱动电路的工作效率最高.实验结果表明,电机的最高空载转速为520 r/min,最大输出扭矩为4.5×10-3N·m,故验证了样机及驱动电源设计方案的正确性.

Development of Small Rod Shape Ultrasonic Motor and Its Driver

A new small rod shape ultrasonic motor is developed for driving the fingers of the industrial instruments.The parameters of its equivalent circuits are measured.To reduce the geometric size of the driver,a small driving circuit without the transformers is designed for the small motor based on the principle of the resonance booster.The theoretical analysis shows that the highest efficiency can be obtained when the circuit is driven at the same frequency of the fundamental component of the output signal and t...