Discussion
Neodymium iron boron magnets are used in preference to ferrite in a servo machine because they have
Answer: B
Correct answer: a far higher energy product for the same volume
Neodymium iron boron offers several times the energy product of ferrite, so the same flux comes from a much smaller magnet and the rotor is lighter and lower in inertia. That is exactly what a servo machine needs. The costs are price, a lower working temperature and a strong tendency to corrode.
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