| Summary: | 碩士 === 逢甲大學 === 資訊電機工程碩士在職學位學程 === 106 === This thesis is designed a built-in permanent magnet synchronous motor used in automatic drilling and tapping machines. The design concept of the permanent magnet motor is very different from that of general motors. The first step is to ensure the mechanical strength and reliability of motors at high speeds. Then a reasonable coil structure and thermal conduction structure must be selected, and a proper design that is suitable for industrial manufacturing technology is employed. Secondly, to improve the dynamic response of the electromechanical system, a high density, high stiffness, low inertia, and light weight design is pursued. Meanwhile, to reduce the torque ripple for smooth operation, the magnetic field harmonic components of air gap must be modified.
Rotor structure is one of the key parts for the design of high-speed permanent magnet motor. Common surface-mount rotor structure is difficult to satisfy both the requirement of electromagnetic and mechanical performance. But built-in permanent magnet motor meet the mechanical strength and low inertia o requirement. The mutual restraint between light weight and low torque ripple and that is suitable for industrial manufacturing technology. Based on the product design goals of quantifying manufacturing technology, this thesis proposes a high-quality, high-speed IPM rotor structure that can achieve excellent mechanical and electromagnetic performance through finite element simulation.
The motor is rated of 7.5 kW, at a speed of 18,000 rpm. The maximum speed can reach 24,000 rpm. Under the customer's size limitation, a suitable slot-pole number is selected, then the finite element software is used for analysis of the characteristics, magnetic circuit simulation, etc., as well as the software calculation optimization of each performance, and the open mold engineering drawing is finally completed. At the same time, the design also considers the combination of the future with the spindle, the installation method of the rotor group and the axis, and the dynamic balance correction process, the simulation results in accordance with the above software and the planning of the manufacturing process, to further correct the detailed parts drawings and the governance tool design. The parts are packaged, assembled and tested, with low torque, low temperature rise, high dynamic response and output torque satisfaction.
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