Abstract
The small size of high-speed permanent magnet synchronous machines (PMSMs) makes the increase of loss density and the difficulty of heat dissipation. PMSMs are sensitive to temperature, especially the permanent magnet (PM), which is likely to suffer irreversible demagnetization due to the excessively high temperature. This paper investigates the loss and thermal analysis of high-speed PMSMs with amorphous alloy stator core and interior permanent magnet (IPM) rotor. First, the trajectory of magnetic flux density in typical parts of high-speed PMSM with sinusoidal and pulsewidth modulation (PWM) inverter power supply is analyzed. The core loss characteristics based on the proposed field-circuit coupled method is obtained. Then, an electromagnetic-thermal iteration calculation method is proposed to analyze the temperature distribution. The effect of different parameters on thermal behavior is investigated, which provide references for the suppression of temperature rise. Finally, the theoretical analysis is verified through the experiments based on a high-speed PMSM prototype.
Highlights
In recent years, due to the advantages of high power density, high efficiency and small size, high-speed permanent magnet synchronous machines (PMSMs) have been widely used in a range of applications, including new energy vehicles, aerospace, high-performance servos and distributed power generation [1]–[4]
The field-circuit coupled simulation method is used to analyze the characteristics of the PMSM loss distribution
For the stator core made of amorphous alloy, the hysteresis loss accounts for a large part of the core loss
Summary
Due to the advantages of high power density, high efficiency and small size, high-speed PMSMs have been widely used in a range of applications, including new energy vehicles, aerospace, high-performance servos and distributed power generation [1]–[4]. Due to the high frequency characteristic of the magnetic flux density in the stator and rotor core, iron loss increases significantly with the frequency, especially the influence of time harmonics caused by the inverter power supply. At 20000 rpm of the high-speed PMSM, due to the influence of the current time harmonics, the magnetic flux density of the stator teeth contains a lot of high-order harmonics such as 11th, 13th, 17th, 19th, 25th, 29th, and 31th with the PWM inverter power supply. As shown in Fig. (a), the eddy current loss and hysteresis loss of the stator teeth increased by 53.0% and 33.8%, respectively, when the PMSM is powered by the PWM inverter. For the high-speed IPM rotor, the PWM inverter power supply has a significant effect on the eddy current loss of the rotor core. The iterative calculation of the PMSM temperature is terminated when the temperature difference is less than a preset tolerance
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