Neodymium iron boron (NdFeB) permanent magnets are widely used in the motor industry due to their advantages of high coercivity, high residual magnetism, and high magnetic energy product. In this article, we will mainly introduce the knowledge related to permanent magnet motors, hoping to be helpful for you.

I. What is a Permanent Magnet Motor?

A permanent magnet motor uses a permanent magnet to generate the motor's magnetic field without the need for excitation coils or excitation current. It has high efficiency and simple structure, which makes it an excellent energy-saving motor. With the emergence of high-performance permanent magnet materials and the rapid development of control technology, the application of permanent magnet motors will become more and more widespread.

NdFeB magnets are widely used in permanent magnet motors.

II. Types of Permanent Magnet Motors:

Common types of permanent magnet motors include: permanent magnet DC motors, permanent magnet AC motors.

Permanent magnet DC motors include: brushed DC motors, brushless motors, stepper motors, etc.

Permanent magnet AC motors include: synchronous permanent magnet motors, permanent magnet servo motors, etc.

III. What are the Advantages of Rare Earth Permanent Magnet Materials?

Due to the excellent magnetic properties of rare earth permanent magnet materials, a powerful permanent magnetic field can be established without the need for additional energy after magnetization. Permanent magnet motors made by replacing the traditional electric field of the magnetic rotor not only have high efficiency but also have a simple structure, reliable operation, small size, and light weight. It can not only achieve high performance that traditional excitation motors cannot achieve (such as ultra-high efficiency, ultra-high speed, ultra-fast response speed) but also can be used to manufacture special motors that meet specific operational requirements, such as elevator traction motors, dedicated motors for automobiles, etc.

IV. How are Permanent Magnet Motors Used in the Automotive Industry?

The automotive industry is the largest user of permanent magnet motors. Motors are a critical component of cars. In super-luxury cars, there are more than 70 types of electric motors for various purposes, most of which are low-voltage permanent magnet DC micro-motors. By using NdFeB permanent magnets and planetary gear reduction, the starting motor of cars and motorcycles can be reduced by half.

V. What are the Differences Between Permanent Magnet Motors and Conventional Motors?

1. Magnetic field properties. Permanent magnet motors maintain their magnetic field without external energy, while conventional motors require current to be circulated.

2. Rotor structure. The permanent magnet motor rotor is installed with a permanent magnet pole, while the conventional motor rotor is installed with an excitation coil.

3. Application occasions. Permanent magnet motors are usually used in small power occasions, while conventional motors, especially excitation motors, are frequently used in high power occasions.

VI. What are the Other Applications of Permanent Magnet Motors?

Rare earth permanent magnet motors are widely used in aerospace, national defense, equipment manufacturing, agricultural and industrial production, and daily life. It includes permanent magnet synchronous motors, permanent magnet generators, DC motors, brushless DC motors, permanent magnet AC servo motors, permanent magnet linear motors, voice coil motors, dedicated permanent magnet motors, and related control systems, which almost cover the entire motor industry.