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. 30, 2001
Filed:
Dec. 30, 1999
John S. Hsu, Oak Ridge, TN (US);
Lockheed Martin Energy Research Corporation, Oak Ridge, TN (US);
Abstract
An uncluttered secondary induction machine (,) includes an uncluttered rotating transformer (,) which is mounted on the same shaft as the rotor (,) of the induction machine. Current in the rotor (,) is electrically connected to current in the rotor winding (,) of the transformer, which is not electrically connected to, but is magnetically coupled to, a stator secondary winding (,). The stator secondary winding (,) is alternately connected to an effective resistance (,), an AC source inverter (,) or a magnetic switch (,) to provide a cost effective slip-energy-controlled, adjustable speed, induction motor that operates over a wide speed range from below synchronous speed to above synchronous speed based on the AC line frequency fed to the stator.