How to Select High-Temperature Motor Magnets? Guidance from Hefei Qizhi Magnet Manufacturers.

When purchasing motor magnets, particularly for newly developed motors, some customers opt to test multiple grades of magnets simultaneously to determine which grade is most suitable. This raises the question: how to select high-temperature motor magnets? In this article, we will address this issue in detail.

Magnetic steel is widely utilized in motors, electrical appliances, horns, water pumps, wind power systems, automobiles, and robotics, serving as one of the critical components. Especially for motor applications, the requirements for magnets are often stringent. Some magnets may fail if they are either too strong or too weak.

Below are recommendations for selecting high-temperature motor magnets:

1. **Operating Temperature Below 200°C**: Use high coercivity neodymium-iron-boron (NdFeB) magnets (SH, UH grades), which offer superior magnetic properties and temperature resistance.

2. **Operating Temperature Between 250°C and 350°C**: Opt for samarium-cobalt magnets to ensure high-temperature stability.

3. **Cost-Sensitive Projects**: Ferrite magnets can be considered, provided that the magnetic requirements are carefully evaluated. For instance, when tested under deep room temperature conditions, the surface magnetic strength of N45SH is higher than that of N40UH, resulting in a higher voltage generation. However, if a motor equipped with N45SH operates at temperatures of 80°C, 100°C, or 120°C, the voltage produced will be lower than that of N40UH. This occurs because N45SH demagnetizes faster than N40UH under elevated temperatures.

If you require consultation, prototyping, or quotations for motor magnets (segmented magnetic steel or multi-pole integrated magnetic rings), please feel free to contact us via email.