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Custom Neodymium Motor Magnets

The requirement for motor magnet is very critical. China Magnets Source Material Ltd produce magnet according to your high requirement. At the same time, not only single rare earth magnet, but magnet component for motor we also can make for you.

High magnetic performance
grades such as N52, N50M, N48H, N45SH, N40UH, N38EH and N30AH are available. Our complete production lines help us meet different demands of customers.

High consistency
To ensure good working performance of motor, the batch-to-batch consistency and continuous stability of permanent magnet are the two of the key indices. Rely on advanced equipments and process management, China Magnets Source Material Ltd can make batch permanent magnets with Cpk of(BH)max above 1.33.

High Working Temperature
The max working temperature for our rare earth sintered neodymium magnet can be above 240℃.

Low Magnetic Field Attenuation
Different batches of our N40SH permanent magnets have a repeated high temperature thermal reduction magnetic test in 120*4 hours; the flux decay is 0 starting from the fourth test.

Low Weight Lost and High Corrosion Resistance
The iron-based and rich neodymium in Ndfeb magnet is equal which leads to very poor magnet corrosion resistance. To avoid oxidation, generally, neodymium magnets need to be electroplated.

As the application field expanded, such as permanent magnet motors using on elevator and wind power, the user puts forward higher requirements on corrosion resistance of ndfeb rare earth magnets. Meanwhile, compared with coated ndfeb permanent magnets, the uncoated neodymium magnets are much better to work with mating parts at the glue adhesive power; the use safety of motor also increase accordingly. Therefore, some customers began to use hast ndfeb permanent rare earth magnet a lot in their products.

In response to this demand, we developed super hast neodymium magnet by keeping innovating and improving. The data unit of weight loss experiment is mg/cm2; and the general data in neodymium industry is above 100mg/cm2. Based on different material formulas and producing technique conditions, the sharp differences will happen in data. The weightlessness data of our part of NdFeB magnets can remain at below 1.2mg/cm2 in 480hours (20days) which HAST required (The experiment result is shown in figure).

Due to very low weightlessness properties, magnets have good corrosion resistance to promote reliability and service life significantly. Hast neodymium magnet can meet stringent requirement of corrosion resistance for high-end application field like permanent magnet motor. This applies mainly to elevators, radar, wind turbines and other military aerospace, industrial motors, etc.  

Weight loss conditions:
1. under the condition of 2atm,100%RH and 120 ℃, tested at 48 hours, 96 hours, 240 hours, 360 hours, 480 hours, 600 hours, 720 hours, 960 hours respectively, our magnets get data 0-0.1 at 48 hours, the average value is 0.
2. Data from 960 hours, weightlessness is less than 1.2 mg/cm2.

Note: weightlessness has two mainly test standard
American requirements
PCT test: 2 ATM (atmospheric pressure), 95% RH (humidity), 121 ℃, 96 hours, weightlessness required below 5 ~ 10 mg/cm2;
European requirements
HAST test: 3 ATM (atmospheric pressure), 95% RH (humidity), 130 ℃, 168 hours, weightlessness required below 2 ~ 5 mg/cm2;

The weightlessness data for each grade ndfeb magnets is different; if you need, please consult our professional engineers.

Contact information
China Magnets Source Material Limited
Tower B, Qiongzhu Building,
Huawang Rd,Longhua District,
Tel: +86 755 28174720
Fax: +86 755 28174720