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. 02, 1990
Filed:
Jun. 24, 1988
Applicant:
Inventor:
Claude Oudet, Besancon, FR;
Assignee:
Portescap, , CH;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02K / ; H02K / ;
U.S. Cl.
CPC ...
310162 ; 310193 ; 310254 ; 310268 ;
Abstract
In synchronous electric motors of the type having a movable multipolar permanent magnet member and a stator comprising magnetic circuits coupled to a control coil. The magnetic circuits form an air-gap of variable height in which the permanent magnet member is movably arranged. The improvement defines the height of the air-gap as a function of the position of the movable member, taking into account various design parameters of the motor, in order to obtain a purely sinusoidal variation of the torque produced in each phase of the motor by a constant control current.