The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 01, 1977
Filed:
May. 02, 1975
Frank Lyman, Jr, Cambridge, MA (US);
William C McDonald, Belmont, MA (US);
Cambridge Thermionic Corporation, Cambridge, MA (US);
Abstract
A rotary stepping motor having high torque and low rotor inertia wherein the rotor is of a disk type configuration having a plurality of uniformly spaced rotor poles and the stator has a plurality of stator pole pairs which are formed in separate groups, the spacing between the stator poles in each group being equal to the rotor pole spacings and the spacings between the stator pole groups being not equal to the rotor pole spacings. The stator may be formed of laminated stator elements to provide a magnetic path with the laminations oriented so as to prevent delamination thereof due to the magnetic forces present during operation. The laminated stator elements are appropriately affixed to the motor housing so that the pole pieces thereof are maintained at preselected positions relative to a reference planar surface of the housing. The rotor poles may be tapered to further reduce the rotor inertia and increase motor speed operation.