Electric rotary machine having concentrated winding stator
Patent 6313558 Issued on November 6, 2001. Estimated Expiration Date: 
April 10, 2020. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
April 10, 2020. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3860843 Spindle motor for optical disc drives Stator of and arc shaping method for brushless motor Patent #: 6044737 InventorsAssigneeApplicationNo. 546885 filed on 04/10/2000US Classes:310/254, Stator structure310/216Core featuresExaminersPrimary: Nguyen, Tan T.Attorney, Agent or FirmForeign Patent References
International ClassH02K 021/22AbstractAn electric rotary machine has a concentrated winding stator and a rotor facing the stator with a gap therebetween. The stator has M number of stator magnetic poles extending in the radial direction from an annular yoke, pole pieces each extending in the circumferential direction of the rotor from the tip end of each of the stator magnetic poles, and windings wound around the stator magnetic poles. The rotor having a permanent magnet with P number magnetic poles, wherein P:M=6n-2:6n, or P:M=6n+2:6n, where n is an integer not less than 2, and the figure of each of the pole pieces is so determined that a gap formed between the pole piece and the rotor is increased going toward the both ends of the pole piece. | |
