Optimal IPM Machine Design and Flux-weakening Control

Optimal IPM Machine Design and Flux-weakening Control
　　Interior permanent magnet (IPM) motor are capable of high power density,high efficiency and extremely wide constant power operating range, with these characteristics it has been widely used in traction applications ,military industry and aerospace.Focusing on the defaults & researching emphasizes on IPM motor and its flux-weakening(FW) control, this paper has proposed transient Finite Element Analysis (FEA)model accounting for magnetic cross-saturation.The parameter of the motor, the rotor structure of PM、FW control algorithm are analized respectively.(1) The Magnet lifter transient finite element analysis (FEA) model for IPM machines based on flux linkage accounting for magnetic saturation and voltage & current limits is proposed.
　　The model can predict power & torque-speed FW performance accurately.(2) According to the performance requirements of the traction motor, 55kW motor with V-type permanent magnet structure and 7.5kW motor with 1-type permanent magnet section are designed and optimized, and the inductance parameters are calculated, and its FW performance is analyzed. W-type IPM machine with a wide speed range is presented. FEA results indicate that in the unit output torque the amount of permanent magnet, cogging and torque ripple are less. The FW operating range is wider, constant power speed range is larger than other several topological structure.(3) The impact of magnetic saturation effects in IPM motor on torque capability is analyzed in control system. The motor model with accounting for magnetic saturation is established by MATLAB. The system simulation http://www.999magnet.com/products/131-magnetic-lifter with saturation compensation and decoupling control for IPM motor is completed. The results indicate that it widen effectively constant power speed range.(4) A 7.5kW IPM motor prototype was built and the measurement method is studied. Then the parameter and performance are tested and the result show that the design meets performance requirements.