Motor Magnet

Motor magnets are critical components in electric motors, achieving compact, powerful, and durable motor systems and providing efficient energy conversion and high performance, because electric motos provide indispensable power sources for advanced industries and daily life and consume about 70% of the total electric power. The current mainstream permanent magnets for motors include Neodymium magnets, Ferrite magnets, AlNiCo magnets, and Samarium Cobalt magnets. Among them, Neodymium magnet is dominating the market due to its ultra-high magnetic energy product and cost-effectiveness, and is widely used in fields such as new energy vehicle drive motors, wind turbines, and industrial servo motors.

• Advantages of Permanent Magnet Motors over Induction Motors:

   

  1. Efficient and energy-saving: Compared with traditional asynchronous motors, permanent magnet motors have increased efficiency by 10% to 15%, especially in partial load conditions, with significant energy-saving effects, which is in line with the global trend of green manufacturing.

  2. Miniaturization and lightweighting: High magnetic energy product permanent magnets can reduce the size of motors, such as reducing the weight of new energy vehicle drive motors by 30% and helping to improve driving range.

  3. Long lifespan and low maintenance: High quality permanent magnets have simple structure, excellent anti demagnetization properties and a lifespan of over 10 years in environments ranging from -40 ℃ to 200 ℃, reducing equipment maintenance costs.

  4. Customized design: Support multipole magnetization, irregular structures (arc, loaf, ring, etc.), and adapt to different motor topology requirements.

  

• How to Choose a Magnet for Electric Motor Application:

   

  1. Magnetic property parameter matching: Choose magnetic energy product (BHmax), coercivity (Hc), and remanence (Br) according to the design requirements of the motor. For example, high-speed motors require high coercivity to prevent demagnetization.

  2. Maximum operating temperature and coefficient: Samarium cobalt or high temperature resistant Neodymium magnet (grades such as N42SH, N35UH) are preferred for high-temperature environments with good temperature stability.

  3. Protective technology: Neodymium magnet requires coating protection (Nickel, Zinc, Epoxy resin) to prevent oxidation; Fully sealed magnets can be used in complex environments.

  4. Cost optimization plan: Hybrid magnetic circuit design (Neodymium + Ferrite) or reducing rare earth content (low Dysprosium / No Dysprosium technology) can balance performance and cost.