Study on driving magnetic field and performance of GMA for nozzle flapper servo valve

• 来源期刊: 煤炭学报（英文版）
• 年，卷（期）: 2007,（2）
• 页码范围: 207-210
• 页数: 4页
• 语种: 英文

摘要

The structure and principle of the GMM actuator and the new nozzle flapper valve with the GMA were presented. Based on the axis-symmetric FEM model of the GMA,driving magnetic field was computed. And the field distribution for different input currents and variant curves of magnetic flux density along the axis were determined by using FEM.Magnetic flux density of the GMM actuator was practically measured under different input currents. The experiment of output displacement and frequency response of the GMM actuator was carried out under typical working conditions. The experiment results show that the GMA for nozzle flapper servo valve has bigger output displacement and quick response speed. And theoretical basis was presented to further introduce the GMA nozzle flapper valve into two stage electro-hydraulic servo valve.