The circular magnetic steel used in motors is generally bonded with neodymium iron boron magnets and injection molded ferrite magnetic rings, but the disadvantage is that both materials have poor magnetic properties.
There are also cases of using ring sintered neodymium iron boron, which require specialized molds for production and magnetization, resulting in higher costs. In addition, there are various magnetization methods that can generate a good sinusoidal magnetic field, which is more reliable than conventional methods in high-speed motor applications.
Ring magnets for motors have many advantages, such as:
1. Strong magnetic performance: The magnetic field distribution characteristics of circular magnets enable them to have stronger magnetic energy.
2. Good stability: The magnetic field stability of the circular magnet is good, which can better maintain the magnetic field strength without changing.
3. Simple structure: The circular magnet has a simple structure, is easy to process and manufacture, and can be produced on a large scale and reduce manufacturing costs.
4. Long service life: The ring magnet has a long service life and can continuously and stably provide magnetic force, thereby extending the service life of the motor.
Of course, circular magnets also have some drawbacks, such as:
1. Large weight: The circular magnet has a large weight and requires certain requirements for the structure and installation of the motor.
2. Magnetic field is not easy to adjust: The magnetic field strength of a circular magnet is not easy to adjust. If it is necessary to adjust the magnetic field, the magnet needs to be redesigned and manufactured.
Technically, the radiation ring has become very mature, and some major domestic and international customers are using it in bulk.
How large can a magnetic steel be magnetized to what level? Levels four and eight.
From the current perspective. The minimum diameter is 14mm, and the maximum diameter is around 70mm (no matter how large it is, it cannot be made, but it has not been produced). In fact, the aspect ratio and wall thickness of the magnetic ring are very important, which directly affect the qualification rate and whether it can be produced in batches. The specific specifications still need to be analyzed in detail.