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:
Aug. 02, 1977
Filed:
Feb. 26, 1976
John Cardwell Clegg, Provo, UT (US);
Battelle Development Corporation, Columbus, OH (US);
Abstract
A motor speed control system which comprises: (a) a power modulator circuit having gating means adapted to control the power supplied to the motor; (b) means adapted to provide a voltage which is directly proportional to the instantaneous motor terminal current; (c) means adapted to provide a sensing current which is directly proportional to the voltage across means (b), and thus to the instantaneous motor terminal current; (d) means adapted to provide a sensing current which is directly proportional to the instantaneous motor terminal voltage; (e) summing means adapted to algebraically sum the instantaneous values of the two sensing currents; (f) integrator means adapted to average the sum of instantaneous values provided by means (e); and, (g) feedback means adapted to generate a signal for operating the gating means, said signal having a phase determined by the output of the integrator means, whereby the output of the integrator means controls the phase of the gating means and thereby controls the power supplied to the motor.