The high efficiency permanent-magnet synchronous gear-motor (PMSGM) is developed for smart elevators. The efficiency of the traditional gear reducers (66%–76%) is too low to run in the elevator, so the energy saving and reproduction technology with high efficiency is instead. The design objectives of PMSGM face torque density, efficiency and torque ripple questions. This paper presents new optimization design methods for the multi objectives. The pole shape optimization based on Taguchi method provides the key factor analysis between those objectives, then proceeds the one factor optimization method to obtain the solution. Finally, the protocol type of the motor, the 3.0 KW PMSGM is made. The performance and parameters of the motor is obtained under the load. The efficiency of the motor is near 92% and meets the design goal. The key parameters of the motor are obtained, such as d-axis reactance, q-axis reactance, resistance, and flux linkage. The field results about the new motor are closed to that of the simulation. Spatially, the lower total harmonics distortion (THD) shows that the motor will provide a good performance of the implementation about the torque ripper.
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