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:
Nov. 16, 1999
Filed:
Mar. 26, 1998
William R Archer, Fort Wayne, IN (US);
Roger C Becerra, Fort Wayne, IN (US);
Brian L Beifus, Fort Wayne, IN (US);
Mark A Brattoli, Fort Wayne, IN (US);
David M Erdman, Fort Wayne, IN (US);
Thomas M Jahns, Schenectady, NY (US);
Gerald B Kliman, Niskayuna, NY (US);
Wen Liang Soong, Schenectady, NY (US);
Charles M Stephens, Pattersonville, NY (US);
Eric R Benedict, Madison, WI (US);
Michael W Degner, Madison, WI (US);
General Electric Company, Schenectady, NY (US);
Abstract
A single phase permanent magnet motor includes a rotor, a stator, and a quadrature axis winding positioned out-of-phase from a main winding of the stator for generating an output signal representative of rotor angular position. An integrator can be coupled to the quadrature axis winding for phase retarding the output signal, and a comparator can be coupled to the integrator for detecting zero crossings of the phase retarded output signal to provide a commutation signal. The quadrature axis winding can be positioned about ninety electrical degrees out-of-phase from the main winding of the stator, and the integrator can be adapted to phase retard the output signal by a number of degrees which decreases as a speed of the motor increases. At low speeds the phase retard is preferably at about ninety degrees so that the phase retarded signal becomes in-phase with the main stator winding back EMF voltage. The motor may further include a rectifier coupled to the quadrature axis winding for rectifying the output signal, and a lowpass filter for filtering the rectified output signal to provide a signal proportional to velocity. Also the single phase motor is commutated for maximum torque production.