NdFeB Magnet on New Energy Automobile
High-performance of rare earth magnets refers to high magnetic energy products or combination property of the coercivity & magnetic energy products in the conventional sense. Currently, the development degree of the high-property rare earth magnet is influenced by the demand of the application industry.
SmCo magnet and NdFeB magnet both belong to the rare earth magnet family because of the Sm, Co, Nd, B, Dy, Ga elements in their composition. They are the strongest type of permanent magnets available, producing significantly stronger magnetic fields than other types such as ferrite or alnico magnets, for SmCo has a magnetic energy product of about 15 – 30MGOe and sintered neodymium magnet has about 27- 50MGOe.
The constantly upgraded motors in the new era ask for higher coercive force. So the higher working temperature and coercive force can ensure the strong ability of anti-demagnetization. For example, because of high transient load, the drive motor in the new energy automobile have the critical requirement on the magnet coercive force.
Is the high corrosion magnet the future research direction?
To ensure that the electric car can still run after going through more than 20 kilometers of cold summer heat, there are many aspects that need to research, such as magnetic properties, relative physical performance and reliability of working life. So in the premise of guarantee, the basic magnetic performance, prolonging rare earth magnets using life is one of the current and future permanent magnet development directions.
What are product homogeneity and the relationship with magnetic declination?
Magnet module homogeneity is related to the current stability when the motor output. With bad homogeneity, distribute uneven magnetic field will cause motor vibration. There are lots of influence factor that caused magnetic declination; one is homogeneous materials, the other is uniform magnetization, and some process like magnet perpendicularity is also a factor.
What is the highest working temperature for sintered neodymium magnet?
At moment, no neodymium magnet can meet the 300℃ working temp. Actually, the working temp. of neodymium magnet depends on its operating environment. Take the drive motor in the new energy automobile for example again, the heat resistance requirement of this drive motor magnet, whether 180℃ or 200℃, rests with the power of the engine. And in actual production, it’s necessary to leave some space to keep its temperature stable by choosing a higher working temp magnet than the originally working temperature. For this reason, some companies will request a 220℃ magnet.
Which magnet performance has an impact on motor power and speed?
It’s a simple structure, small volume, lightweight, low loss, and high efficiency of rare earth permanent magnet rotor. So motor power speed is often about magnetic force.
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