Abstract

Linear compressor is composed of the linear oscillating motor directly coupled with the piston and springs for resonance operation. One clear advantage of moving coil linear compressor is absence of radial forces. And this makes it possible to achieve high performance. Design and optimization of linear motor for moving coil type linear compressor used for refrigerator and the characteristics of that are studied in this paper. The model of linear oscillating motor is analyzed and simulated by using finite element analysis software. From the analysis the motor constant representing force of motor per unit current can be obtained. The coil wire diameter was changed to find out its affect to motor constant and loss of resistance, from which the best coil wire diameter can be found to get the best energy efficiency. Distribution of static magnetic field can also be got, which is used to optimize the magnetic circuit. Through these analyses the parameters of the linear motor are optimized. The iron loss analysis of linear motor is studied by using the analytical and numerical method. For the validation of the iron loss result, the experiment measuring the iron loss of linear motor is performed. The optimization between area of piston and design stroke for a given exhaust volume are also studied. The piston of linear compressor can move freely, a controller is needed to control the stroke of piston and decrease the gap volume. The operating frequency is a significant parameter of linear compressor. Experiments showed that without pumping the minimum input power and current are obtained near the mechanical resonant frequency. And charging pressure had significant effect to resonant frequency. Moreover compare with Technical Specifications for Energy Conservation Product Certification for air compressors vocabulary-General, our linear compressor met it very well. From the above analyses a prototype of linear compressor was designed. From the experiments the performance of linear compressor was better than conventional compressor.

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