How do Electric Vehicle Motor Magnet perform at high temperatures?

The performance of Electric Vehicle Motor Magnet at high temperatures is one of the important indicators to evaluate their quality and application scope. Electric Vehicle Motor Magnet are prone to demagnetization at high temperatures. Permanent magnets may lose part or all of their magnetism in high temperature environments, causing the magnetic field strength to weaken. The working temperature of magnets can reach up to about 200°C, and demagnetization may begin when this temperature is exceeded. Lower-quality motor magnets may begin to demagnetize at temperatures around 110°C, while better-quality magnets can withstand temperatures of around 140°C. If the magnets of a permanent magnet motor are heated to extremely high temperatures, most of the magnetism may be lost.
Although Electric Vehicle Motor Magnet will demagnetize at high temperatures, high-quality magnetic materials usually have good temperature stability. This means that within the normal operating temperature range, the performance of the magnet is relatively stable and will not significantly degrade due to slight fluctuations in temperature.
The impact of high temperature on Electric Vehicle Motor Magnet is not limited to demagnetization. High temperature will increase the resistance of the motor windings, resulting in increased losses when current passes through, thereby reducing the working efficiency of the motor. As the efficiency of the motor decreases, the energy consumption of electric vehicles will also increase accordingly, thus affecting the cruising range. The windings inside the motor are usually wrapped with insulating materials. If the temperature is too high, the performance of the insulating materials will decrease, and may even cause aging, burning, damage, etc., resulting in a short circuit between the windings and the motor unable to operate normally. In extreme cases, if the motor temperature is too high and cannot be effectively controlled, it may cause the internal components of the motor to burn, and then spread to the entire vehicle, causing a fire accident.
In order to improve the performance of Electric Vehicle Motor Magnet at high temperatures, high-performance permanent magnets such as neodymium iron boron are used to improve the high temperature resistance and stability of the magnets. By improving the heat dissipation structure of the motor, the operating temperature of the magnet is reduced and its service life is extended. Regularly monitor and maintain electric vehicle motors to detect and deal with potential high temperature problems in a timely manner.