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. 14, 1976
Filed:
Dec. 19, 1974
Philip Piatkowski, Jr, Fraser, MI (US);
Ford Motor Company, Dearborn, MI (US);
Abstract
A control circuit for a variable reluctance motor. A solid state switching device has its output circuit connected in series with the electrical winding of the motor. Circuit means are coupled to the motor winding and to the control electrode of the solid state switching device. The circuit means senses the EMF induced in the motor winding while the motor is rotating and while the switching device output is nonconductive. The switching device output circuit is rendered conductive when the EMF attains a predetermined level. The EMF induced in the winding of the rotating motor results from residual magnetism in the magnetic circuit of the motor or from such residual magnetism in addition to a bias current supplied to the motor winding. The variable reluctance motor acts as its own position sensor.