Abstract: Investigates the proportional resonant (PR) controller to improve the acoustic noise performance in air-conditioning applications. Firstly, current harmonic in the permanent magnet synchronous machine and analyzes the PR controller parallel connected with the proportional integral (PI) controller in the synchronous rotating reference in order to reduce current harmonic in the air-conditioning fan. The model and formula of PR controller are derived in the time domain, and the parameters of PR controller are calculated in real time in the control program. Moreover, the current harmonic and noise improvement scheme of the PR controller in the air conditioning fan is proposed and verified. Finally, the effectiveness of the method on current harmonic suppression and noise dissonance elimination is verified through experiments.

Key words: Permanent magnet synchronous machine, PR controller, Current harmonic suppression, Noise improvement