Patent ID: 7105973

Claim:
A permanent magnet brushless motor comprising: a wound assembly comprising permeable laminations with slots; an insulated copper wire wound with within the slots to provide electrical phases; a field assembly comprising a permeable structure and at least 20 magnet poles arranged thereon; wherein the wound assembly and the field assembly are arranged to produce a motive force when the electrical phases of the wound assembly are excited; and wherein the wound assembly has a slot to pole ratio less than one to increase torque efficiency, the slot to pole ratio being selected so that a C T value is less than 6 and a Kp value is greater than 0.9 where (1) Kp=sin(1−|(pitch pu−1)|*90.0) where pitch pu=(tooth span pitch/pole pitch) and (2) C T =p Q s /N c , where p=the number of motor poles, Q s =the number of slots, and N c =the least common multiple between the slot number and the pole number.