1. Permanent magnetic materials
Alnico: Alnico permanent magnet material is one of the earliest widely used permanent magnet materials, and its preparation process and technology are relatively mature.
Permanent ferrite: As a non-metallic magnetic material, ferrite does not have the disadvantages of easy oxidation, low Curie temperature and high cost of metal permanent magnet materials, so it is very popular.
Samarium cobalt: A permanent magnet material with excellent magnetic properties that emerged in the mid-1960s and has very stable performance. Samarium cobalt is particularly suitable for manufacturing motors in terms of magnetic properties, but due to its high price, it is mainly used in the research and development of military motors such as aviation, aerospace, and weapons, and motors in high-tech fields where high performance and price are not the main factor.
NdFeB: NdFeB magnetic material is an alloy of neodymium, iron oxide, etc., also known as magnetic steel. It has extremely high magnetic energy product and coercive force. At the same time, the advantages of high energy density make NdFeB permanent magnet materials widely used in modern industry and electronic technology, making it possible to miniaturize, lighten and thin equipment such as instruments, electroacoustic motors, magnetic separation and magnetization.
Notes on permanent magnet motors
1. Magnetic circuit structure and design calculation
In order to give full play to the magnetic properties of various permanent magnet materials, especially the excellent magnetic properties of rare earth permanent magnets, and manufacture cost-effective permanent magnet motors, it is not possible to simply apply the structure and design calculation methods of traditional permanent magnet motors or electromagnetic excitation motors. New design concepts must be established to re-analyze and improve the magnetic circuit structure. With the rapid development of computer hardware and software technology, as well as the continuous improvement of modern design methods such as electromagnetic field numerical calculation, optimization design and simulation technology, and through the joint efforts of the motor academic and engineering communities, breakthroughs have been made in the design theory, calculation methods, structural processes and control technologies of permanent magnet motors, forming a complete set of analysis and research methods and computer-aided analysis and design software that combines electromagnetic field numerical calculation and equivalent magnetic circuit analytical solution, and is being continuously improved.
2. Irreversible demagnetization problem
If the design or use is improper, the permanent magnet motor may produce irreversible demagnetization, or demagnetization, when the temperature is too high (NdFeB permanent magnet) or too low (ferrite permanent magnet), under the armature reaction caused by the impact current, or under severe mechanical vibration, which will reduce the performance of the motor and even make it unusable. Therefore, it is necessary to study and develop methods and devices suitable for motor manufacturers to check the thermal stability of permanent magnet materials, and to analyze the anti-demagnetization capabilities of various structural forms, so that corresponding measures can be taken during design and manufacturing to ensure that the permanent magnet motor does not lose magnetism.
Media Contact
Company Name: Anhui Mingteng Permanent-Magnetic Machinery & Electrical Equipment Co., Ltd.
Contact Person: Mingteng
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Country: China
Website: https://www.mingtengmotor.com/