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인버터 구동 유도전동기의 가창소음 저감을 위한 새로운 펄스폭 변조기법
최규하,신우석,함연창 建國大學校 附設 産業技術硏究所 1992 논문집 Vol.17 No.-
The PWM inverter system are widely used to control the induction motor, and their switching frequency rises to the higher for better performances. But the upper should be limited for safe operation as well as switching loss reduction in the power transistor inverters. This makes the level of the audible noise much increased. In order to overcome such noise problem, a new PWM control technique is proposed in the power transistor inverters, of which carrier frequency is to change a according to the slope of the sine wave reference signal. As a result the frequency spectra are improved and hence the audible noise couble be reduced greatly.