Iron Core Loss of Amorphous Alloy High Speed PMSM with Variable Frequency Supply Used for Micro Gas Turbine Power Generation

Abstract

High speed permanent magnet synchronous motor (HSPMSM) has fast speed and high frequency, and the core loss accounts for a large proportion of the total loss, which affects the improvement of motor efficiency. In addition, the small size of the high-speed motor increases the loss density and makes it difficult to dissipate heat. The permanent magnet (PM) is easy to demagnetize due to the high temperature. To reduce the core loss and improve the efficiency, this paper uses the iron-based amorphous alloy strip as the stator core material of the HSPMSM. The iron core loss of amorphous alloy HSPMSM is analyzed and compared with that of the traditional silicon steel HSPMSM both powered by the inverter. Firstly, the Taguchi method is used to optimize the rotor pole structure of the HSPMSMs with AA and silicon steel as the stator core to reduce the harmonic content of the air gap magnetic flux density. Then, the field-circuit co-simulation model of HSPMSM and the SVPWM variable frequency supply are built on the ANSYS and Simulink platforms. The stator core loss and rotor eddy current loss of the two motors under different load with sinusoidal and variable frequency power supply are compared and analyzed, and the eddy current losses due to the different harmonic magnetic fields are separated. A filter inductance is connected in series between the inverter and the motor to reduce the current harmonics. The influence of the filter inductance on the iron core loss is analyzed. The efficiencies of the two motors at rated load are analyzed and compared.