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. 18, 1986
Filed:
Jan. 07, 1985
Applicant:
Inventors:
Deryk S Gould, Edinburgh, GB;
Michael T Wright, Limekilns, GB;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02K / ;
U.S. Cl.
CPC ...
310 87 ; 310 90 ; 310211 ; 310D / ; 4174 / ;
Abstract
An induction motor with an improved torque/slip characteristic has a solid rotor having longitudinal grooves running parallel to the axis of rotation which connect with circumferential grooves at each end of the rotor. The rotor is plated with copper so that the grooves are filled with copper. The rotor is then machined over the cylindrical outer surface to produce a solid, non-laminated rotor having high-conductivity paths in the longitudinal grooves connected by high-conductivity short-circuiting rings in the circumferential grooves. In a modification the longitudinal grooves may be skewed. Other high conductivity material may replace copper, for example aluminium.