Method for improving operation performance of ultrasonic motor

The invention discloses a method for improving the operation performance of an ultrasonic motor, and relates to the field of ultrasonic motors. The method comprises the following steps of: selecting a stator mode order and a stator periodicity of the ultrasonic motor primarily; analyzing a phase tuning factor, and judging the stress and a corresponding vibrating state of the ultrasonic motor; and analyzing an application occasion of the ultrasonic motor, and determining a preferred combination scheme of the stator mode order and the stator periodicity. By the method, according to the structure of the ultrasonic motor and the symmetry of acting force between a stator and a rotator, the problems of irrational parameter selection of the ultrasonic motor, and large vibration noise, lower precision, short service life and the like which are caused by irrational parameter selection and the like are effectively solved by using a specific periodic time-varying contact action mechanism between the stator and the rotat