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:
May. 31, 1977
Filed:
Mar. 24, 1975
John H Knight, Kettering, OH (US);
Milton S Isaacson, Dayton, OH (US);
Xerox Corporation, Stamford, CT (US);
Abstract
A machine which operates like a DC commutator motor continuously variable in speed with load change or held to a fixed selectable speed. The machine includes a rotor member with means for producing a magnetic field therein fixedly oriented with respect to the rotor. The rotor is rotatably mounted within a stator which has a plurality of windings. Means are provided for applying periodic power pulses to the stator windings. When current passes through a stator winding, there is a torque due to the interaction of the winding generated flux and the rotor field, that causes the rotor to rotate. A power control system responds to signals induced in unpowered stator windings by the rotating rotor field to produce power pulses at a predetermined frequency. The pulse duration and amplitude are adjusted by the control system. These power pulses are applied to the stator windings in a predetermined sequence to produce a rotating field which causes the machine to operate like a DC commutator motor variable in speed with load change or held to a fixed selectable speed over a wide range of motor torques. The power control system additionally includes means for self-starting the machine in a desired direction of rotation.