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:
Mar. 25, 1986
Filed:
Dec. 13, 1984
Applicant:
Inventor:
Raymond E Welterlin, Cary, NC (US);
Assignee:
Buehler Products, Inc., Raleigh, NC (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02K / ;
U.S. Cl.
CPC ...
310 / ; 310268 ; 310156 ; 318254 ;
Abstract
A brushless, self-commutating DC motor including a tachogenerator for producing speed control signals, the motor having a cup-shaped housing fixed to an output shaft and carrying a cylindrical annular permanent magnet. The motor also includes a stator assembly having six rotor drive coils paired to provide a three phase driving coil system and a tachogenerator yoke and coil assembly forming part of the stator system. The rotor magnet has two tracks of multipolarization formed of an outer track of a plurality of driving magnetic poles and an inner track of tachogenerator magnetic poles of a greater number than the driving poles.