| US 7,576,500 B2 | ||
| Method and system for operating a motor to reduce noise in an electric vehicle | ||
| Nitinkumar R. Patel, Cypress, Calif. (US); Mohammad N. Anwar, Van Buren Township, Mich. (US); Silva Hiti, Redondo Beach, Calif. (US); Brian A Welchko, Torrance, Calif. (US); Steven E. Schulz, Torrance, Calif. (US); and Lisa M. Talarico, Farmington Hills, Mich. (US) | ||
| Assigned to GM Global Technology Operations, Inc., Detroit, Mich. (US) | ||
| Filed on May 31, 2007, as Appl. No. 11/756,349. | ||
| Prior Publication US 2008/0298785 A1, Dec. 04, 2008 | ||
| Int. Cl. H02P 1/00 (2006.01) | ||
| U.S. Cl. 318—139 [388/820; 701/22; 180/312] | 20 Claims |
| 1. A method for operating a motor coupled to an electrical bus in a vehicle comprising:
determining selected resonant frequencies of the electrical bus, the selected resonant frequencies having a low resonant frequency
and a high resonant frequency;
providing power to the motor through at least one switch operating at a switching frequency; and
controlling the switching frequency as a function of a rate of operation of the motor, the function characterized by one of:
a first substantially linear portion having a first slope when the switching frequency is less than or equal to a selected
switching frequency and
a second substantially linear portion having a second slope if the switching frequency is greater than the selected switching
frequency, the selected switching frequency being greater than the low resonant frequency; and
a substantially linear portion having a y-intercept greater than the low resonant frequency.
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