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A Novel Method for Calculating the Stroke of LPMSM for Driving Linear Compressor Using High Pass Filter  

Ahn, Jung-Ryol (울산대 전기전자정보시스템공학부)
Lee, Hong-Hee (울산대 전기전자정보시스템공학부)
Kim, Heung-Gun (경북대 전자전기공학부)
Nho, Eui-Cheol (부경대 공대 전기제어계측공학부)
Chun, Tae-Won (울산대 전기전자정보시스템공학부)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.11, no.1, 2006 , pp. 7-13 More about this Journal
Abstract
Linear compressors with a free piston driven by a linear motor are widely attention in the cooling apparatus such as refrigerator due to the high efficiency The stroke of piston in the linear compressor driven by LPMSM (Linear Permanent-Magnet Synchronous Motor) can be obtained from Integrating the input voltage and current of LPMSM, but it may be diverged due to dc components in the voltage and current. The strategy to prevent the divergence of stroke using both the high-pass filter and do offset compensation was suggested. The equations for the magnitude and phase of the stroke and also dc offset including the stroke are derived as a function of the cut-off frequency of HPF. The accurate stroke of a piston can be calculated by compensating for dc offset. The performance of the newly developed stroke calculation scheme has been verified by experimentally on a linear compressor drive system, where the control was implemented by a 16-bit DSP.
Keywords
LPMSM; Linear compressor; Stroke; Integration; High-pass filter;
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