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Net Journal 9


Explanation 1: Neodymium magnets

Neodymium magnets are permanent magnets made from alloys of rare earth elements such as neodymium. They have extremely strong magnetic force. Besides motors for HEVs, they are also used in many home electronic products, such as hard disk drives, mobile phones, and personal computers.


Explanation 2:Ferrite magnets

Ferrite magnets are commonly available magnets such as bar magnets and magnet products used in small motors, homes, and offices. Their prices are 1/10th of the prices of neodymium magnets. They hold promise as an alternative for rare earth magnets.


Explanation 3/Figure 1:Rare earth-free newly-structured 50 kW ferrite magnet motor for hybrid electric vehicles

By using a segment structure in the motor whereby ferrite magnets and soft magnetic composite cores are alternated, the motor is rotated by two types of torques – magnetic torque (force produced by the magnets’ attraction and repulsion of each other) and reluctance torque (force due to the magnets’ attraction to iron). This produces output that rivals conventional rare earth magnet motors for HEVs.



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