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. 14, 2003
Filed:
Mar. 09, 2001
Ronald A. Johnson, Effingham, IL (US);
Eltra Systems, Inc., Effingham, IL (US);
Abstract
An electric drive system is provided to generate varying amounts of output torque supplied to a driven member over a wide range of constant revolutions per minute speeds to reduce power consumption. The electric motor includes a rotor and a stator assembly. The stator assembly is disposed around the rotor and is inductively coupled to the rotor. The stator assembly further includes a plurality of poles, each pole consisting of a plurality of split windings wound so that the magnetic fluxes generated therefrom are added. Power switching circuits are provided for energizing the partition drives of split windings on each of the stator poles. A controller is used to selectively control the frequency, pulse width modulation, and partition configuration to vary the rotational speed and torque generation supplied to the driven member.