Design And Analysis Of A Novel Magnetic Coupler For Converting Between Rotary And Rectilinear Motion

Compared with the mechanical gear, the magnetic coupler has the following characteristics:the input and the output is of non-contact characteristics, zero friction small noise and vibration; no lubrication, no pollution and automatic overload protection ability. In recent years, with the further development of research of magnetic coupler, the new topology emerges in endlessly, which enhances the torque density and operating performance of magnetic coupler greatly and mechanical gear has been replaced by magnetic coupler in many application fields.In addition to the power density and operating performance, the movement of multi-degree of freedom is the research direction of magnetic coupler. Continuous development of industrial level and the more complexity of transmission device put forward higher requirements on magnetic coupler to realize complex forms of motion.Based on existing research results, this thesis integrates the thought of the magnetic field modulation principle in the topology of magnetic coupler and combines with the movement form of the magnetic coupler, which leads to the result that this thesis proposes a novel magnetic coupler for converting between rotary and rectilinear motion, which is with flexible structure forms, large area of field coupling and high power density. Revolveing around the novel magnetic coupler for converting between rotary and rectilinear motion, the research is launched. The main research work includes the following aspects:1) The development of magnetic coupler is introduced in chronological order. According to the magnetic field characteristic and movement form, the magnetic coupler is classified. The characteristic of magnetic coupler is analyzed. The hot research topic, application and further research work is revealed.2) The magnetic field modulation principle and working principle of magnetic coupler for converting between rotary and rectilinear motion is analyzed by analytic method. The value of magnetic field modulation principle applied in magnetic coupler for converting between rotary and rectilinear motion is revealed.3) The thesis proposes a method of computation for electromagnetic torque and electromagnetic force under the interaction of permanent magnetic field. Permanent magnet is equaled to surface current and line current. Electromagnetic torque and electromagnetic force are calculated based on Lorentz force. The performance of field modulation of ferromagnetic pole-pieces is analyzed with different structure of ferromagnetic pole-pieces. Structure of ferromagnetic pole-pieces is determined in the judgement of amplitude of flux density and harmonic orders. The design parameters of magnetic coupler are determined. 4) The finite model of coupler is created based on Maxwell. The static characteristics of magnetic coupler is calculated and analyzed, which include the distribution of magnetic field, static torque, static force, cogging torque and cogging force. The performance test plan of magnetic coupler is proposed and the static characteristic is verified by experiment. The important factors that influence the result of the experiment are revealed.5) The finite element parametric model of magnetic coupler is established. The influence of design parameters on performance of magnetic coupler is analyzed. Structure parameters of magnetic coupler are optimized by comprehensive optimization.