Investigation of a New Bar-Type Traveling Wave Ultrasonic Motor

In order to increase the new bar-type ultrasonic mo tor′s rotating speed, load capacity and energy conversion efficiency, we studie d the structure of the motor′s stator and rotor and the contacting model of the motor′s stator with finite-element analysis and calculation. We proposed a ne w stator structure to amplify the vibration amplitude of the stator on the conta cting surface of the stator and the rotor. The idea of flexible rotor is present ed for decreasing slide friction on the contacting surface of the stator and the rotor. Some mechanical characteristics parameters are experimentally investigat ed. We conclude that the suitable value of force which presses the stator compon ents together is about 2000 N and the force which presses the stator and the rot or is about 35 N. Under the above condition, the operating frequency is 3 8.7 kHz and its rotation speed is 225 r/min without load and the maximal t orque is 42 N·m.