The remanence index is the maximum magnetic flux intensity that a magnet can provide after being magnetized without an external magnetic field. The larger the value, the higher the magnetic density of the magnet's air gap, and the higher the maximum torque and efficiency point.

Coercive force is a parameter that represents the ability of a magnet to resist demagnetization. The larger the value, the lower the thickness of the magnet during motor design, and the stronger the ability to resist overload;

The maximum magnetic energy product represents the maximum magnetic energy that a magnet can provide to the outside world. The higher the value, the less magnets will be used at the same power.

The Curie temperature Tc is the temperature point at which the magnetic properties of the magnet disappear, indicating the temperature range within which the magnet can operate.

And the temperature coefficientα If it is a magnet, it represents the percentage of reversible changes in the magnetic properties of the magnet with temperature changes. These two indicators are temperature indicators that need to be considered when using magnetic materials.

In addition, the shape of the magnet also has a significant impact on the performance of the motor. The thickness, width, chamfer and other external conditions of the permanent magnet can not only affect the efficiency of the magnet, but also affect the accuracy of mechanical installation and vibration during use, ultimately affecting the efficiency and cost of the motor.

When the external magnetic circuit of the motor is fixed, an increase in the thickness of the magnet can reduce the air gap and improve the efficiency of the motor, but it can lead to motor commutation vibration. If the square magnet is not chamfered, it will cause a large rate of magnetic field change, resulting in pulse vibration of the motor. The larger the chamfer, the smaller the pulse vibration; But chamfering can result in less magnetic flux.