What is the advantage of Interior permanent magnet over surface permanent magnet?

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CoastalCruiser

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#2
This has been discussed here and there. Can't find the core thread at the moment. Not 100% sure about one design having better torque control than another, but it may be the IPM motor. Reason being, most internal permanent magnet motors (in EVs) are used to augment a reluctance machine (switched reluctance motor), and electronics have been developed to precisely control reluctance machines.

Now that is torque control. For pure torque advantage, a motor builder told me once nothing beats a pure PM motor for torque. ;>

But comparing the designs in general, IPM designs use smaller magnets than PM designs, and combined with the very simple construction of the reluctance rotor are apparently cheaper to build.
 

tudole3

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#4
If the smaller magnet can reduce the weight, it will reduce the rotational inertia and increase efficiency.