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To meet the steep demand of small volume and light weight, this paper completes the research on characteristics of a novel permanent magnet linear motor, following the principle of high power density and high efficiency, and finally realizes energy conversion efficiently. The reasonable magnetic circuit structure and electromagnetic design are adopted to design and develop novel permanent magnet linear motor prototype. The contrast analysis of axial magnetic flux structure and Halbach structure is implemented, and then the best solution of design size and performance is completed. Also the prototype is developed and verified. The test results show that the prototype of the permanent magnet linear motor can meet the requirement of high power density and high efficiency. The novel permanent magnet linear motor also has a higher dynamic response and higher thrust/weight ratio.

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Abstract.To solve the problem of the speed stability on the digital servo drive system for the large inertia and DC torque motor and improve the system's performance and reliability, the research on control strategy is conducted. Based on the working characteristics of the radar turntable DC torque motor servo system, the three PWM control modes on the H-bridge power main circuit and the current pulsating quantity and direct connection on uni-polar control mode are analyzed; by improving the pulse voltage frequency on the armature's ends, the system's performance is improved. The system's mathematical model is established, the system is simulated by using the transfer function in the MATLAB/SIMULINK and analyzed in the qualitative method.