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. 17, 1998
Filed:
Nov. 10, 1997
Michael D Cummins, Miami Beach, FL (US);
Other;
Abstract
A commutator for A.C. shaded pole motors that permits the use of a D.C. source to provide a suitable alternating current that can be adjusted to regulate the rotational speed and compensate for the slip factor. The commutator includes a wave forming circuit that generates two triggering signals with rising and falling time that do not coincide in time. These triggering signals are transmitted to the gates of respective power switching devices to alternatively make a connection to ground of the ends of the motor winding. The motor winding includes a central tap to which a D.C. voltage is applied and the two halves are wound to induce opposite magnetic fields. The magnetic fields will thus avoid fighting or contention.