Permanent magnet type three-phase stepping motor
April 28, 2025. 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 3866104 Stepping motor Permanent magnet type step motor Permanent magnet electrical machine with reduced cogging D. C. motor with multi-tooth poles Hybrid-type stepping motor Three-phase permanent magnet stepping motor Stepping motor with detent torque elimination Permanent magnet type stepping motor Motor with electronic distributing configuration InventorAssigneeApplicationNo. 11116542 filed on 04/28/2005US Classes:310/156.64, Axially magnetized with pole shoes at both ends310/49R, Step-by-step310/254, Stator structure310/261, Rotor structure310/256, Stray field flux loss prevention310/168, Inductor-type generators (variable reluctance)318/254SELF-COMMUTATED IMPULSE OR RELUCTANCE MOTORSExaminersPrimary: Schuberg, DarrenAssistant: Scheuermann, David W. Attorney, Agent or FirmForeign Patent References
International ClassH02K 37/10AbstractA permanent magnet type three-phase stepping motor that is simple in construction, with reduced vibration, a reduced unbalanced force in the radial direction, and high torque that can be manufactured at a low cost. The permanent magnet type three-phase stepping motor has a stator and a rotor arranged concentrically with the stator and with an air gap therebetween, said stator having three stator poles, and stator windings of three-phase each wound around each stator pole, each of said stator poles having m pieces of stator pole tooth, said rotor having two split rotor elements, a permanent magnet held between the rotor elements and magnetized so as to form N and S poles in the axial direction thereof, and a plurality (Nr) of small rotor teeth formed at a regular pitch on the outer peripheral surface of each of said rotor elements, said two split rotor elements being circumferentially shifted from each other by a ½ pitch of the small rotor teeth, wherein a pitch of the stator pole teeth is smaller than the pitch of the small rotor teeth, m is an integer and (Nr±2k)/3, Nr is 3n±1, n is an integer not less than 1, and k is an integer not less than 1 and not more than 4.Other References
Field of SearchStep-by-stepPlural units, structurally united Plural rotary elements Plural armatures in common field Axially magnetized with pole shoes at both ends Laminated pole shoes Synchronous Windings and core structure Field or excitation windings or structure Slotted or divided pole Stator structure Rotor structure SELF-COMMUTATED IMPULSE OR RELUCTANCE MOTORS | |
