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:
Sep. 05, 1989
Filed:
Jan. 28, 1988
Applicant:
Inventors:
Assignee:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02K / ;
U.S. Cl.
CPC ...
318254 ; 318138 ;
Abstract
A three-phase D.C. brushless motor having a rotor and stator windings of three phases can be driven by alternately switching to the step of causing currents to flow through stator windings of only two phases among the stator windings of three phases or to the step of causing currents to flow through the stator windings of all the three phases each time the rotor rotates 30 degrees in terms of an electrical rotational angle, whereby torque fluctuation can be reduced.