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Advantages and Disadvantages of Plastic Magnetic Rotors

Plastic magnetic rotors, also known as injection molded magnetic rotor magnets, are commonly used in motors, encoders, and sensors, and they have some advantages and disadvantages, let's take a look.

Advantages of Plastic Magnetic Rotors;

1、Complex shape

Like plastic products, plastic magnetic rotor injection molding can produce complex shapes of magnets, molded parts can have unique size, shape, magnetic and mechanical properties.

2、 Multiple molding methods

Plastic magnetic rotor can adopt "embedded molding", "multi-step molding", "multi-part molding" way to combine the magnet with other parts, thus saving the cost of secondary processing and assembly. Assembly costs.

3、Strong corrosion resistance

Due to the high content of polymer binder in the injection molded magnetic rotor, the magnet itself has strong corrosion resistance and usually does not require surface coating protection.

The accompanying picture shows a 4-pole plastic-magnetic rotor with magnetic properties around 1700 gauss.

Plastic Magnetic Rotors

4、 Not fragile, crack-resistant, easy to assemble

Compared with sintered magnets, plastic magnetic rotors have better crack resistance and are easy to assemble. The embedded molding process allows the magnetic powder material to be injected directly into the product to form a component.

5、 Lower noise and vibration

The high efficiency and low loss characteristics of plastic magnetic rotors reduce vibration and noise generated by the motor/generator, providing smoother and quieter operation.

Disadvantages of plastic-magnetic rotor;

1、 Low magnetic properties

Compared with traditional metal magnetic materials, the magnetic properties of plastic-magnetic rotors may be lower. This can affect the efficiency and performance of the device.

2、Manufacturing complexity

The manufacturing process of injection-molded magnetic rotors is relatively complex, involving injection molding processes and handling of magnetic materials that require strict process control and technical requirements. This may increase the difficulty and cost of manufacturing.

3、Production requires mold and magnetizing fixture costs

Both ferrite plastic magnetic rotor or neodymium plastic magnetic rotor production requires molds and magnetization fixtures, magnet manufacturers can save the cost of opening molds if they have molds.

While injection molded magnetic rotors offer advantages in a number of areas, the disadvantages mentioned above may limit their suitability for certain applications. When adopting injection molded magnetic rotor technology, the advantages and disadvantages need to be weighed and evaluated against the requirements of the specific application.

Related plastic-magnetic rotor magnet products;

Injection ferrite magnets

Injection molded neodymium magnets

Radial rotor magnets

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