In order to improve the performance of linear ultrasonic motors, the method of power flow analysis was applied, and the existed L1B4 plate-type linear ultrasonic motor was optimized and redesigned. L1B4 plate-type linear ultrasonic motor was made discrete, then multi-degreeof-freedom model of the motor was presented. And the equivalent mechanical network of the vibration of the motor based on Norton equivalent system was established. According to the network, the mathematical expression of power flow that w...