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:
Apr. 25, 2000
Filed:
Apr. 12, 1999
Applicant:
Inventor:
Andrew Shun Chiu, Kowloon, HK;
Assignee:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02K / ; H02K / ;
U.S. Cl.
CPC ...
310 51 ; 310261 ; 310183 ;
Abstract
The present invention provides an electric motor with a reduced number of windings on one of the coil windings. The effect of this is that when the motor is in operation, the current that flows through the coil with the reduced number of windings differs from the others, and this difference can be detected to allow accurate control of the motor. To avoid any mechanical imbalance caused by this difference in the number of windings, mechanical compensation means is provided on the arm with the reduced number of windings. Preferably this comprise a further winding that is not electrically connected to the motor circuit.