Optimization Design of Line-Start Permanent-Magnet Synchronous Motor Applied for Small Direct Drive

The paper deals with the design of line-start permanent-magnet synchronous motor (LSPMSM) with low speed and multi poles applied for small direct drive. Firstly, according to the motor design index and electromagnetic load, we complete the initial design of the motor. By analyzing the operation performance of the motor, the main design variables and multi-objective optimization are determined. Using the orthogonal test method and the analysis of the performance index of electromagnetic calculation, the optimization of the design variables in a large range is completed. Taking a line-start permanent-magnet synchronous motor with 5. 5kW, 20 poles supplied power frequency as an example, the multi-objective optimization design process is described, and the performances of the motor is analyzed which meet the technique requirements.