Research of a Giant Magnetostrictive Valve With Internal Cooling Structure

This paper proposes a giant magnetostrictive valve (GMV) which uses a tube giant magnetostrictive material (GMM) rod as the actuator. Based on the analysis of the structure and magnetic field of giant magnetostrictive actuator (GMA), a GMV is designed and manufactured. The output displacement characteristics of the GMA under different temperatures are tested. The maximum magneto-strain is about 1500 ppm and the response time is about 1.8 ms. Compared with the simulation of temperature-rise characteristic computed by finite element analysis software, the results show that the internal cooling effect is significant, and the GMA continues working in a relatively stable temperature range. Then, the test bench of the GMV is set and the flow control characteristic is tested. The results show that the internal cooling on-off type giant magnetostrictive valve has many merits including a fast response speed, a stable working temperature range and high precision flow control.