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Linear compressors are becoming more widely utilized in refrigeration for their high efficiency in comparison with traditional rotary devices. The nature of the free piston in a linear compressor requires additional control which necessitates knowledge of the mechanical dynamics of the system. Sensorless control of the system is preferred for cost effectiveness. To this end, a pair of nonlinear observers...
Linear vapor compressors are becoming more widely utilized in refrigeration applications due to their high efficiency as compared with traditional rotary devices. The nature of the free piston in a linear compressor allows the system resonant frequency to vary with the force of gas compression. In order to ensure efficient operation of the compressor the motor must be excited in such a way as to ensure...
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