Proceedings of the KIPE Conference (전력전자학회:학술대회논문집)

The Korean Institute of Power Electronics (전력전자학회)
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REDUCTION OF AUDIBLE SWITCHING NOISE IN INDUCTION MOTOR DRIVES USING RANDOM POSITION PWM

  • Na, Seok-Hwan (Dept. of Electrical Engineering, Chonam National University) ;
  • Wi, Seok-Oh (Dept. of Electrical Engineering, Chonam National University) ;
  • Lim, Young-Cheol (Dept. of Electrical Engineering, Chonam National University) ;
  • Yang, Seung-Hak (Dept. of Electrical Engineering, Honnam University)
  • Published : 1998.10.01
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Abstract

RPWM(Random Pulse Width Modulation) is a switching technique to spread the voltage and current harmonics on the wide frequency area. Using randomly changed switching frequency of the inverter, the power spectrum of the electromagnetic acoustic noise cab be spread to the wide-band area. The wide-band noise is much more comfortable and less annoying than the narrow-band one. So RPWM have been attracting an interest as an excellent method for the reduction of acoustic noise on the inverter drive system. In this paper a new RPPWM (Random Position PWM) is proposed and implemented. Each of three pulses is located randomly in each switching interval. Along with the randomization of PWM pulses, the space vector modulation is executed in the C167 microcontroller also. The experimental results show that the voltage and current harmonics were spread to wide band area and that the audible switching noise was reduced by proposed RPPWM method.

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