Electric motor magnets, particularly neodymium magnets, are integral components that determine the performance, efficiency, and reliability of electric motors. Neodymium magnets are essential components in modern electric motors, providing the necessary magnetic fields for efficient and powerful operation. Selecting the right type of magnet based on the specific application and environmental conditions is key to optimizing motor performance. Horizon has been focusing on the development and production of a high-end series of electric motor magnets, which is widely used in permanent magnet motors and generators.
Due to their advantage, NdFeB rare earth magnets have become one of the most important components of permanent magnet motors and generators, whose performance and lifetime mainly depend on the quality of the magnets. Generally speaking, the working environment for motors and generators is very harsh. To adapt to this working environment, we have been devoting ourselves to research and developing NdFeB rare earth magnets specially used for permanent magnet motors and generators since its foundation. For this application, the magnets are available in a wide range of shapes such as block, ring, segment, loaf, wedge, etc.
Currently, we are producing serials of high end grades, like H, SH, UH, EH, and AH for NdFeB with the following three characteristics:
● High intrinsic coercivity Hcj: high to >35kOe (>2785 kA/m) which increases magnets demagnetizing resistance. Neodymium magnets have high remanence (Br) and coercivity (Hc), making them ideal for high-performance motors.
● Low reversible temperature coefficients: low to α(Br)< -0.1%/ºC and β(Hcj)< -0.5%/ºC which increases magnets temperature stability. Motor magnets must maintain their magnetic properties under varying temperature conditions. High-temperature grades like N45H, N42SH, etc., are used in applications where heat is a concern.
● Low weight loss: low to 2~5mg/cm2 in HAST testing condition: 130ºC, 95% RH, 2.7 ATM, 20 days which increases magnets corrosion resistance
● Corrosion Resistance: Coatings such as nickel, epoxy, or combinations thereof protect the magnets from corrosion, especially in motors exposed to harsh environments.
Although the low weight loss material improves its corrosion resistance, the coating is still often required by customers. If customers require coating, we suggest magnets be phosphate or passivated. However, more and more customers change to use magnets without any coating, because uncoated magnets have much better glue cohesiveness than coated magnets.
Servo motors, elevator motor magnets, traction motors, linear motors, stepper motors, disc-type motors, wind generators, etc.
In electric motors, particularly in high-performance and modern electric motors, neodymium magnets are commonly used due to their exceptional magnetic properties. While neodymium magnets are the most common and preferred choice for modern electric motors due to their high magnetic strength and efficiency, other types of magnets such as ferrite, samarium cobalt, and alnico are used based on specific requirements and constraints of the application.
Main Test Items Before Delivery:
To ensure NdFeB magnets meet requirements, we mainly test the following items: size, weight loss, magnetic properties, flux, flux density, angle deviation, magnetic loss, appearance, coating thickness, corrosion resistance, etc. The magnet products we produce have strict quality control standards.
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