Piston position sensing and control in a linear compressor using a search coil
Piston position sensing and control in a linear compressor using a search coil
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DOI：
10.1016/j.ijrefrig.2016.02.007
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发表时间：
2016-06
期刊：
影响因子：
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通讯作者：
K. Liang;R. Stone;M. Dadd;P. Bailey
中科院分区：
文献类型：
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作者：
K. Liang;R. Stone;M. Dadd;P. Bailey
具有间隙密封的线性压缩机被很好地建立用于使用斯特林循环或脉冲管的低温冷却器。然而，在带阀压缩机中，活塞冲程和活塞偏移都需要检测和控制。为了大规模生产直线压缩机，需要一种简单、鲁棒、廉价的控制系统，其传感器和执行器的数量最少。这项工作介绍了一种方法来感测活塞的位置，使用搜索线圈。通过计算与测量的驱动电压和电流相关的峰-峰磁链来检测活塞冲程。活塞偏移与探测线圈的反电动势（emf）的积分模量成比例。两个PID（比例-积分-微分）控制器的开发，以控制活塞行程，通过调整驱动电压和电磁阀和排气流量来控制活塞偏移。实验结果验证了所提出的压缩机控制技术。
Linear compressors with clearance seals are well established for cryocoolers using either a Stirling cycle or pulse tube. However, both piston stroke and piston offset require detection and control in valved compressors. In order to manufacture linear compressor in large scale, then a simple, robust, and cheap control system is required with a minimum of sensors and actuators. This work introduces an approach to sensing the position of the piston using a search coil. The piston stroke is detected by calculating the peak-to-peak flux linkage in relation to the measured drive voltage and current. The piston offset is proportional to an integrated modulus of the back electromotive force (emf) of the search coil. Two PID (proportional-integral-derivative) controllers were developed to control the piston stroke by adjusting the drive voltage and a solenoid valve and bleed flow to control the piston offset. Experimental results validate the proposed compressor control technique.