Robert Britton Williams
Engineers in Westminster, CO
License number
Colorado 39601
Issued Date
Oct 19, 2005
Renew Date
Nov 1, 2015
Expiration Date
Oct 31, 2017
Type
Professional Engineer
Address
Address
PO Box 872, Westminster, CO 80038
Personal information
See more information about Robert Britton Williams at radaris.comName
Address
Phone
33574 Quill Ln, Elizabeth, CO 80107
333 W Ellsworth Ave APT 503, Denver, CO 80223
3340 15Th St, Boulder, CO 80304
3391 S Pontiac St, Denver, CO 80224
Professional information
Brushless Dc Motor Pwm Scheme For Quiet Commutation
US Patent:
5955851, Sep 21, 1999
Filed:
Jan 28, 1998
Appl. No.:
9/014844
Inventors:
Eric M. Solie - Durham NC
Robert A. Williams - Louisville CO
Robert A. Williams - Louisville CO
Assignee:
Harris Corporation - Melbourne FL
International Classification:
H02P 614
US Classification:
318254
Abstract:
The present invention is a brushless dc motor driver system for quiet commutation of current from one load winding to another load winding. The system comprises a first circuit, a second circuit and a third circuit. Each circuit comprises an upper field effect transistor connected at one end to a voltage source and at its other end to a junction of a corresponding lower field effect transistor and a load. The system further comprises a resistor electrically connected to each lower transistor. The resistor generates a signal representative of the total current of the three circuits. The system also comprises a pulse width modulator electrically connected to each field effect transistor. The modulator controls the commutation system. The modulator comprises a comparing means, a responsive means, a gate slew and a determining means.