Have You Truly Chosen the Right Magnetization Direction for Your Application?
Different application scenarios have different magnetization directions. Magnetization is a key process in the production and application of neodymium magnets. It directly determines the magnetic force, magnetic field distribution and final application results. Magnetization direction is crucial to the projects. Two magnets of the same size and grade can show different properties due to their different magnetization directions. Therefore, engineers and designers must carefully select the correct magnetization to achieve the desired performance.
| Magnetization Type | Definition | Pole Distribution | Typical Shapes | Typical Applications | Technology Complexity |
| Axial Magnetization | Direction is along axis (thickness/height) | Two ends are N and S poles (2 poles) | Disc, Ring, Block, Rod | Loudspeakers, Sensors, Consumer electronics. | ★☆☆☆☆ |
| Radial Magnetization | Direction is along radius (center outward/inward) | ID and OD surfaces are N and S poles (2 poles) | Ring, Cylinder, Arc | Radial flux motors, Generators, Magnetic bearings. | ★★☆☆☆ |
| Axially Multipole | Multiple poles on end face; direction remains axial | 4, 8, 12+ alternating poles on end face | Ring, Disc | Stepper motors, BLDC rotors, Magnetic encoders. | ★★★★☆ |
| Radially Multipole | Multiple poles on circumference; direction remains radial | 4, 8, 16+ alternating poles on OD/ID | Ring, Arc | Servo motors, EV motors, Wind turbines. | ★★★★☆ |
1. What is Axial Magnetization?
Axial magnetization is the most basic and commonly used magnetization directions for sintered neodymium magnets. For disc, ring, bar, and rod magnets, magnetization occurs along the direction of their thickness or height. After magnetization, the two ends of the magnet form the N pole and S pole respectively. Axial magnetization is suitable for most small permanent magnet components, such as loudspeakers, sensors, and consumer electronics.
2. What is Axially Multipole Magnetization?
Axially multipole magnetization is an extension of axial magnetization. It consists of multiple magnetic poles (e.g., 4, 8, 12 poles, etc.) distributed across the axial end face of the magnet according to a certain pattern. Although the direction of the magnetic field still extends axially, the number of magnetic poles exceeds that of traditional two-pole magnetization. Axially multipole magnetization is mainly used for applications requiring high magnetic field precision and density, such as stepper motors, brushless DC motors and magnetic encoders.
On disc or ring magnets, multiple magnetic poles can be magnetized along the axial direction. This technique is commonly used in the rotor magnet rings of brushless DC motors, allowing for a multi-pole magnetic field without assembling multiple independent magnetic poles. Axial multi-pole magnetization requires a precise magnetization head design to ensure clear pole boundaries and uniform magnetic field strength.
3. What is Radially
The direction of the magnetic field in radial magnetization is parallel to the radius of the magnet. After magnetization, the outer and inner surfaces of the magnet form N and S poles respectively (or vice versa), with the magnetic poles distributed along the circumference. Radially magnetization is mainly used for cylindrical, ring and other hollow-structured magnets. It is widely applied in radial flux motors, generators, magnetic bearings and other equipment. Radial magnetization includes 2, 4, 8 and other radially multipole magnetization.
For cylindrical magnets, the magnetization direction can be along the radial direction. This type of magnetization is common in loudspeaker magnetic circuits and some sensors. Achieving uniform radial magnetization requires a special magnetization coil design to ensure that the magnetic field direction always points towards or away from the center.
4. What is Diametrically Multipole Magnetization?
Diametrically multipole magnetization is characterized by multiple magnetic poles (e.g., 2, 4, 6, 16 poles) alternately distributed along the circumference of the magnet. The magnetic field direction is radial, and adjacent poles have opposite polarities. Diametrically multipole magnetization is a core technology in high-end equipment such as drive motors for new energy vehicles and wind turbines, significantly improving the power density and operating efficiency of the motor. For bar or curved magnets, multi-pole magnetization can be achieved along the length. This method is widely used in linear motors and specialized sensors.
5. What is Skewed Magnetization?
Skewed magnetization is a specialized magnetization method. The magnetic poles are distributed at a certain angle (typically 5°- 30°) relative to the magnet axis. After magnetization, this produces a spiral distribution of magnetic poles along the circumference . Skewed magnetization is primarily used in high-performance motors. Its core advantage is the effective suppression of cogging torque and electromagnetic noise during motor operation, thus improving motor smoothness.
Contact Us
Xinfeng Magnet is specialized in sintered NdFeB magnets for over 20 years. We are developing advanced solutions for various magnetization directions. Faced with challenges such as high coercivity materials, complex-shaped magnets, and multi-pole magnetization, our company is continuously innovating magnetization equipment and optimizing process parameters. Choosing Xinfeng Magnet, you are not just securing a supplier; you are securing your future production capacity with a partner dedicated to precision and reliability.