Displacement Model of Giant Magnetostrictive Actuator for Direct-Drive Injector

Aiming at the inherent problems of non-direct-drive injectors, such as long oil circuits and a difficult precise control needle stroke, based on structure direct-drive injector combined with demand for drive truck diesel injector, this study designs fabricates giant magnetostrictive actuator injectors. A simplified model is established, which mainly simplifies magnetization to facilitate subsequent integrated modeling fuel injector. An output displacement test system was built, waveform frequency characteristics were analyzed. It found that experimental results in good agreement calculated model, average relative error amplitude 3.26%, while phase difference 3.83%, verifies correctness model. This research enriches method actuators has an important reference value design