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:
Jan. 07, 1986
Filed:
Feb. 25, 1985
Nagahiko Nagasaka, Iruma, JP;
Kabushiki Kaisha Yasawa Denki Seisakusho, Kitakyushu, JP;
Abstract
A permanent magnet type stepping motor is provided. The rotor is made of a cylindrical laminated iron core whose outer periphery is toothed at an equal pitch, and the number of teeth is Nr. The stator is made of a laminated iron core whose inner periphery is formed so as to face the rotor at an air gap between the rotor and the stator. Thin plate permanent magnets are attached on the surface of the stator teeth facing the air gap. The permanent magnets are disposed at an equal pitch and polarized such that the polarities of adjacent pole pieces differ from each other. The number of pole pieces is Ns, and has a relation Ns=2(Nr.+-.Np), where Np is an integer more than 1. The stator grooves are half opened or closed and have multiphase 2 Np pole distributed windings.