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question
Why the magnetic steel is fragile?
Answer
Sintered NdFeB (neodymium iron boron) is a material used in powder metallurgy industry. It is very similar to ceramics, which is harder and brittle. The principal phase of NdFeB is composed of complex quadruple cells, with low slip coefficient and small volume fraction of neodymium-rich phase, which is not sufficient to significantly improve material brittleness. The hardness of the product is high, with a Vickers hardness of 500-700 HV. Generally, the hardness and toughness of material are reversely correlated. NdFeB is processed by powder metallurgy. There are more or less local impurities, holes and microcracks in the product, making the material prone to cracking and fragile under the action of external force.
question
Which is the maximum magnetic steel size?
Answer
The magnetic steel size depends on its quality and density. Generally, the density is 7.5-7.6 g/cm3 (slight difference), and the main factor in determining the volume of the product is quality. The maximum heavy blank produced by our company at present: unit weight 1.7 Kg; length 133 mm; height 41 mm; magnetization 42 mm. For products of special specifications, our company provides splicing viscose component as a solution, which can reduce the eddy current loss of customer motors and improve motor work efficiency.
question
What is the most reasonable magnetic steel size?
Answer
To be determined according to motor design requirements of the customer. In principle, the larger the PC point, the more difficult to demagnetize. However, motor cost shall be taken into account.
question
For a pair of cylindrical solid magnetic steels under pole-parallel magnetizing, when the OD is 70 mm, what is the maximum axial length?
Answer
The optimum axial length is recommended to be 30-40 mm when the OD is 70 mm.
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