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:
Oct. 22, 1991
Filed:
Dec. 12, 1989
Emanuel E Shah, Benbrook, TX (US);
Other;
Abstract
A brushless rotating electrical machine based on a novel rotatable transformer. The motor can operate on both AC or DC. The rotatable transformer, termed brushless power unit, transfers power to the rotating armature without any physical contact and the operation of the brushless power unit is independent of speed of armature. A sensor on the armature detects the position of the armature coils in relation to magnetic neutral axis and switches semiconductor switching devices located on the armature to reverse the direction of current in the armature coils to commutate the current and produce a continuous torque. The electronic commutation is also applied to polyphase AC machines to obtain brushless operation. DC excitation system for synchronous machines can obtain brushless operation using the brushless power unit.