Research On Harmonic Motor Based On Giant Magnetostrictive Material

The Giant Magnetostrictive Material (GMM) is a new type of function materials. Due to its giant magnetostrictive strain, high power density, high electromechanical coupling coefficient, high response speed and high force output, it can realize conversion among electricity, magnetism and mechanism, and its performance of electromechanical conversion is very excellent. Because of its excellent properties and promising application foreground, scientists all over the world are interested in it. The Giant Magnetostrictive Actuator (GMA) based on positive magnetostrictive effect has a broad application prospect.Because traditional giant magnetostrictive motors are driven by friction, which reduces the using life, work efficiency and precision of the motors, the paper presents a new type drive device—giant magnetostrictive harmonic motor. The harmonic motor combines principle of harmonic drive and magnetostrictive performance of GMM, and outputs force and displacement by harmonic drive. Because of some characteristics of harmonic drive, such as high performance, low yawp, big velocity ratio, small volume and so on. This harmonic motor based on GMM has much superiority on work performance and controllable performance comparing with traditional giant magnetostrictive motors.(1) Analysis of the working principle of harmonic drive, and a better known to the basic properties of GMM.(2) Basic structure of giant magnetostrictive harmonic motor is studied and designed. The paper combines principle of harmonic drive and magnetostrictive performance of GMM, and has designed the giant magnetostrictive harmonic motor, which mainly includes the analysis of the working principle, the design of basic structure and the design of GMA.(3) The control system of giant magnetostrictive harmonic motor is designed. It mainly includes the analysis of the control principle, the design of control program, and a further interpretation for control strategy.(4) The experimental study of GMA is carried on. The experiment includes displacement and force properties test for the actuator, in order to verify the rationality of the design of GMA and the feasibility of applying the GMM to the harmonic drive.