Vibration analysis of rolling piston-type compressors driven by single-phase induction motors

Abstract

Rolling piston-type compressors [l], [2] driven by single-phase induct,ion motors are widely used in low power room air conditioners. Since a rolling piston-type compressor represents an eccentric load to the mot.or, vibration problems associated with the compressor and motor drive assemhly always occur. Furthermore, for ease of darting, a single-phase induction motor is usually designed with unsymmetrical stator windings, which is far more difficult to be analyzed as compared to a typical symniet,rical t.lirec-phase indnction motor. This paper est.ahlislies t,he state-space model for a rolling piston-type compressor driven by a single-phase indudon motor. An inverter is proposed for driving t,he motor-compressor assembly. By varying the line frequency and voltage magnit.ndes on both primary and secondary windings of the induction mot.or, this paper seeks t.o reduce t.he vibration accompanied with the motor-compressor assembly of a room air conditioner. The paper presents some useful design crit,eria for reducing vibrations based on computer simulation result,^.performance as compared to other approaches, computer simulation is conduct.ed in Section IV. The simulation st,udies several control configurations and compare their performance in terms of speed, torque, and current fluctuations. The aim is to choose a control configurat,ion that can reduce most motor-compressor vibrat,ions. Simulat.ion resu1t.s show that the proposed constant V / f cont,rol is a promising candidat.e. Finally, some concluding remarks are given in Section V.

Sensorless PMSM Drive Inductance Estimation Based on a Data-Driven Approach

“…Particularly in environments where the motor drive is directly exposed to a periodic load torque, such as pumps, home appliance compressors, and vibration suppressors injecting counter motor torque, the control performance can be significantly compromised. In these cases, the effects of load torque fluctuation can be counteracted by analyzing the load pattern and applying a proper compensation current [7][8][9]. However, using this load torque compensation method reduces the effects of fluctuating load torque, and the magnitude of compensation torque current is increased.…”