Patent ID: 8269391

Claim:
A micro rotor comprising a plurality of thick film magnets having one of circular and annular plate shape, which each comprise an isotropic magnet with a thickness t 1 having an in-plane remanence Mr of 0.95 T or more and a coercivity HcJ of 400 kA/m or more and a non-magnetic material with a thickness t 2 adapted to isolate two adjacent isotropic magnets where a ratio of t 1 /t 2 is eight or more, and which are stacked on one another in multiple layers in a rotation axis direction such that the non-magnetic material is located between the two adjacent isotropic magnets, wherein at least two pole pairs are provided and a mean magnetic path of in-plane direction is provided which has a permeance (B/μoH) of five or more achieved by the magnet alone.