背衬封装对卧板式直线超声电机输出推力的影响

研究了超声电机的背衬封装与预压力承载能力的关系。以外型尺寸为36mm×5mm×4mm的卧板式直线超声电机为研究对象，建立了电机振动力学模型，针对不同封装方式下的模型进行了分析。通过改进的等效刚度模型，研究了封装夹持对电机刚度参数的影响，得出电机封装与预压力承载能力之间的关系，并通过预压力加载实验测得各自所能承载的最大预压力。当激励信号电压为150Vpp，频率为63kHz时，给电机添加局部背衬的封装方式，使电机能够承受的最大预压力为16N，输出推力比常规封装大两倍以上，证实了背衬式封装能改变力传递路径，能使电机能承受更大预压力。

Study on the effect of back packaging on the output thrust of board-type horizontal linear ultrasonic motor

The relationship between back packaging of ultrasonic motor and its carrying capacity of pre-load is studied. The vibration model was found and analyzed under different packaging ways taking board-type horizontal linear ultrasonic motor in sizes of 36mm×5mm×4mm as example. The effect of packaging on stiffness of the motor was summed up using equivalent stiffness model. The relationship between packaging and pre-load was also picked out. Through tests, the largest carrying capacities of pre-load of each packaging way were carried out. The results show the motor in partial back of distributing flexible supporting can withstand a maximum pre-load of 16N when the excitation frequency is 63 kHz and voltage is 150 Vpp. The output thrust is twice more than normal packaging way, which confirmed that back packaging can change the force transmission path so that to make the motor withstand a greater pre-load.