High-speed permanent magnet synchronous motor has high power density, high efficiency, small size, light weight and good reliability. Therefore, high-speed permanent magnet synchronous motors are widely used in motion control and drive systems. High-speed permanent magnet synchronous motors will have good prospects in the fields of air circulation refrigeration systems, centrifuges, high-speed flywheel energy storage systems, rail transit and aerospace.
High-speed permanent magnet synchronous motors have two main characteristics. First, the speed of the rotor is very high, and its speed is generally above 12 000 r/min. The second is that the stator armature winding current and the magnetic flux density in the stator core have higher frequencies. Therefore, the iron loss of the stator, the copper loss of the winding and the eddy current loss of the rotor surface are greatly increased. Due to the small size of the high-speed permanent magnet synchronous motor and the high heat source density, its heat dissipation is more difficult than that of the conventional motor, which may lead to irreversible demagnetization of the permanent magnet, and may also cause The temperature rise in the motor is too high, which damages the insulation in the motor.
High-speed permanent magnet synchronous motors are compact motors, so it is necessary to accurately calculate various losses in the design stage of the motor. In the high frequency power supply mode, the stator core loss is high, so it is very necessary to study the stator core loss of high-speed permanent magnet synchronous motor.

1) Through the finite element analysis of the magnetic density in the stator iron core of the high-speed permanent magnet synchronous motor, it can be known that the magnetic density waveform in the stator iron core is very complex, and the iron core magnetic density contains certain harmonic components. The magnetization mode of each area of ​​the stator core is different. The magnetization mode of the stator tooth top is mainly alternating magnetization; the magnetization mode of the stator tooth body can be approximated as the alternating magnetization mode; the junction of the stator tooth and the yoke part The magnetization mode of the stator core is greatly affected by the rotating magnetic field; the magnetization mode of the yoke of the stator core is mainly affected by the alternating magnetic field.
2) When the high-speed permanent magnet synchronous motor runs stably at a higher frequency, the eddy current loss in the stator iron core accounts for the largest proportion of the total iron core loss, and the additional loss accounts for the smallest proportion.
3) When the influence of rotating magnetic field and harmonic components on stator core loss is considered, the calculation result of stator core loss is significantly higher than the calculation result when only considering the influence of alternating magnetic field, and is closer to the finite element calculation result. Therefore, when calculating the stator core loss, it is necessary to calculate not only the iron loss generated by the alternating magnetic field, but also the iron loss generated by the harmonic and rotating magnetic field in the stator core.
4) The distribution of iron loss in each area of ​​the stator core of the high-speed permanent magnet synchronous motor is from small to large. The top of the stator, the junction of the tooth and the yoke, the teeth of the armature winding, the teeth of the ventilation ditch, and the yoke of the stator are affected by the harmonic magnetic flux. Although the iron loss at the tip of the stator tooth is the smallest, the loss density in this area is the largest. In addition, there is a large amount of harmonic iron loss in various regions of the stator core.