摘    要：介绍了三相异步电动机能效标准的国内外情况，并提出该类电机的节能增效措施。
关键词：三相异步电动机；能效标准；节能

Abstract: As relative mature ultrasonic motor,traveling wave ultrasonic motor had same application.But the application was restricted by the strict demand of power supply and the serious jitter of rotate speed.For researching on kinetic characteristic and controlling means of traveling wave ultrasonic motor,a detect and control system was designed based on TMS320LF2407 DSP and direct digital synthesis(DDS)technology in this paper.Experiment indicated the detect circuit worked stably,and the output frequency of the power supply was steady,frequency and phase difference could adjust accurately.
Key Words: Ultrasonic motor;DSP;DDS;Frequency adjust;Phase adjust;Detect