Vibration suppression and control parameter design of a sensorless PMSM rotary compressor drive

The mechanical vibration and the associated acoustic noise problem of variable frequency rotary compressor systems have been concerned by engineers for years. This paper proposes a scheme to reduce the vibration of a sensorless controlled rotary compressor by using bi-quad filter. The paper presents the overall system control architecture as well as a method to design motor speed adaptation parameters and the bi-quad filter parameters. The impacts of motor parameter variation have been analyzed, too. Both simulation and experiment results show that the bi-quad filter can reduce the mechanical vibration effectively and the way of control parameter selection can guarantee the bandwidth of speed estimation and the stability of the speed control loop. By integrating the result of this paper into an industrial drive control software, automatic control parameter commissioning can be achieved after identifying motor electric parameters, which is a meaningful product feature from an engineering point of view.