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US 4,794,292 AGranted
Stepping motor with divided stator pole pieces
AssigneeCanon Kabushiki Kaisha
InventorAkira Torisawa
Life of this patent
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Abstract
A stepping motor with a rotor having magnetic poles arranged at a constant pitch along the periphery, first and second stator sets each having stator poles at a constant pitch and arranged at a mutual offset of 1/4 pitch with respect to the rotor, and coils for magnetizing the first and second stator sets, wherein each stator pole is provided with a magnetic polarity and is practically divided, at least on a face directed to the rotor, into plural areas, so as to form an area of a high magnetic reluctance at the center.
Claims6
A stepping motor comprising:
- a permanent magnet rotor provided with magnetic poles on the periphery thereof;
- first and second stator sets, each having magnetic pole plates provided with tooth-shaped pole pieces extended in the axial direction and arranged at substantially uniform intervals around said rotor;
- and
- a coil for magnetizing said tooth-shaped pole pieces;
- wherein said tooth-shaped pole pieces are divided by a high reluctance area so that the magnetic reluctance of each pole piece changes substantially symmetrically with respect to the central axis thereof.
2 more elements
Dependencies are inferred from the claim text.