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One Misconception about the Magnet Option for Motor or Generator

One common misconception of the magnet option for motors or generators is the oversight of the heat generated during operation and its potential impact on the magnets. This misconception can lead to select inappropriate magnet materials and compromise the machine’s performance. In this article, we will analyze this misconception.

magnet option for brushless DC motor

The Misconception of Magnet Option

Many assume that if the environmental temperature is below 80°C, choosing neodymium magnets is suitable for motors or generators. Sometimes, they are wrong! Why? They ignore the heat generated by motors or generators during the process of operation. The additional heat could have several adverse effects on the magnets.

Performance Degradation: Heat-related magnet deterioration can result in reduced motor or generator performance, such as decreased torque, power output, or efficiency. This can impact the overall efficiency of the system in which the motor or generator is employed.

Demagnetization: Excessive heat can cause permanent magnets, such as neodymium or samarium-cobalt magnets, to lose their magnetic properties. This phenomenon is known as demagnetization and can significantly reduce the motor or generator’s efficiency and output.

Safety Concerns: In some cases, elevated temperatures within the machine can pose safety risks, especially in applications where overheating may lead to equipment malfunction.


magnet option for servo motor

How to Avoid it

To avoid this mistake and its potential consequences, it’s essential to consider the following factors during the magnet option for motors or generators:

Operating Temperature Range: Select magnet materials that can operate within the expected temperature range of the machine. Some materials, like samarium-cobalt, offer excellent high-temperature performance.

Choosing neodymium magnets capable of operating under high temperatures is another wise method. For example, Siemens Gamesa uses N52H for some of its wind power generators.

Cooling and Heat Dissipation: Implement effective cooling mechanisms, such as fans or heat sinks, to manage heat within the motor or generator and ensure that magnets remain within their safe temperature limits.

Thermal Design: Consider the thermal design of the machine and its components to minimize heat generation and maximize heat dissipation.

Regular Maintenance: Implement regular maintenance practices to monitor and mitigate the effects of heat on the magnets. This may include temperature monitoring and insulation improvements.


magent option for motors

Why Motors  Generate Heat During Operation

Is it possible for the motors not to generate heat during the process of operation? The answer is no. Motors and generators generate heat during operation due to several factors:

Electrical Resistance: When electric current flows through the motor or generator’s winding or coil, it encounters resistance in the wire. According to Joule’s law, electrical energy is converted into heat as it overcomes this resistance. This is the primary source of heat generation in electric machines.

Core Losses: The core of an electric machine often consists of iron or other magnetic materials. As the magnetic field rapidly alternates in AC motors or moves in DC motors and generators, it induces eddy currents and hysteresis losses within the core material, leading to heat production.

Friction and Bearing Losses: The moving parts of a motor or generator, including the rotor and bearings, experience friction as they rotate. This frictional resistance generates heat.

So, when choosing magnets for motors or generators, it is necessary to consider the heat generated by the motors or generators.


Neglecting the impact of heat generation on magnets in motors or generators is a misconception of magnet options, which can lead to performance and reliability issues. By choosing appropriate magnet materials and thermal management strategies, you can ensure the longevity and efficiency of your electric machines.

At Tengye, we’re thrilled to be early participants in your new projects. Our passion for magnets extends from material selection and design optimization to providing magnetic solutions. We hope to bring our knowledge and experience to the forefront by actively engaging in your upcoming projects.

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Jonah Jin

Jonah Jin
Managing Director

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