Types and Applications of Arc-Shaped Magnets
Arc-shaped permanent magnets are commonly used in motors, generators, wind turbines, hub motors, permanent magnet synchronous motors, stepper motors, and linear motors. The manufacturing process varies depending on the type of permanent magnet.
Manufacturing Process of Arc-Shaped Magnets
For motors and generators involving arc-shaped magnets, the winding process of enameled wire is usually completed before the installation of the arc-shaped magnets. Currently, the mainstream arc-shaped magnets are generally made of NdFeB material. The manufacturing process of NdFeB arc-shaped magnets generally includes the following steps:
Pressing
Various magnetic single-crystal materials and a small amount of additives are mixed in a certain proportion, and then pressed into a blank under a pressure of 290-350 MPa in an air or nitrogen atmosphere. The size and shape of the blank basically meet the requirements of the magnet. Attention must also be paid to the sintering performance of the blank material and the cleanliness of its surface.
Sintering
The pressed blank is sintered under hydrogen or inert gas protection. By sintering the blank at a high temperature of about 1100-1200 degrees Celsius, the material is densified and the grains grow. After completion, the surface is smoothed through processing steps such as rough polishing and fine polishing.
Grinding
After sintering, the surface smoothness of the magnet blank is insufficient and requires further grinding. Grinding uses a high-speed and gentle mechanical process to machine the top of the magnet blank, and the arc shape can also be formed during grinding.
Magnetization
The magnetic field of the motor and generator is formed through the magnetization of the arc-shaped magnet. Specific processes can be used to orient or strengthen the magnetism of the magnet to achieve a more ideal magnetic field effect.
