A reciprocating compressor with a rotary motor which used in a refrigerator and so on, is low efficiency since it has the large mechanical losses due to the crank mechanism. In the linear compressor of free piston with linear motors, it can be decreased the mechanical losses of the crank mechanism and increased system efficiency. However, the dead center in the compressor system which used the crank is mechanically decided, while the piston position control is required in the linear compressor system due to free the piston. So the compressor will be breakdown and the system efficiency will be fairly decreased, if the piston position is not controlled successfully.
A linear pulse motor (LPM) generally has the precise positioning ability in the open-loop control without the position sensor. Therefore, we expect that the sensorless linear compressor system with the LPM can be realized.
In this paper, we examine the piston positioning accuracy and the efficiency of the sensorless linear compressor system with the LPM at the various compressor size and operating condition by using analytical and experimental approaches. As a result, the efficiency of the linear compressor system is higher than that of a conventional reciprocating compressor using an induction motor. The system efficiency is fairly improved in the linear compressor with LPM.
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