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Since the temperature has a great effect on the service behavior of the ultrasonic motor, high temperature will affect its mechanical characteristics and service life. This article is on a model of a piezoelectric driven three-stator multi-degree-of-freedom ultrasonic motor. Firstly, the motion mechanism is analyzed, and the main causes of temperature rise are determined to be friction heat generation and vibration heat generation. Then, the theoretical model of temperature rise is built, and the temperature rise characteristics of the

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