Design And Optimization Of Double-layered And Multi-segmented Interior Permanent Magnet Synchronous Motor

The work of this paper mainly addresses two aspects: design of multi-segment and double-layer(MSDL)interior permanent magnet(IPM)motor and optimization of speed range,torque and torque ripple.Firstly,the performance characteristics in multi-segment and double-layer(MSDL)interior permanent magnet(IPM)motors with various rotor structures are studied in this paper.A 50 kW MSDL IPM is designed.Magnetic equivalent circuit(MEC)of the motor is developed to compute the air-gap flux density.Result is verified by finite element method(FEM).Then,a 3-phase 8-pole motor is modeled and analyzed according to the given requirements.As a result,the speed range will be expand with wider iron bridge.The average torque will be lower and the speed range will be broader with wider first layer iron bridge.The speed range of motor after optimization is 50% wider than the origin one.Finally the improved torque ability is acquired by optimization.Taguchi method is used to analyze the performance of the motor while ?p1,?p2,h,l1/l2 change.Then propose the parameters which affect the motor's performance most as variables to establish the response surface equations.The Genetic Algorithm(GA)fitness function is established according to equations.Result shows that average torque of the motor is increased by 27.8% and torque ripple is decreased by 2.9% after optimization.