I want to know the answer to the following question:
How do PMs rate against other types of electric motors?
All the background I'm provided with is that "Miniature motors resemble the structure in the illustration, except that they have at least three rotor poles (to ensure starting, regardless of rotor position) and their outer housing is a steel tube that magnetically links the exteriors of the curved field magnets.". Is that enough to answer the question?