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:
Apr. 19, 2016
Filed:
Feb. 12, 2010
Nicholas Carpenter, Towcester, GB;
Simon Dowson, Towcester, GB;
Tim Woolmer, Oxford, GB;
Chee Yeow Leong, Oxford, GB;
William Treharne, Oxford, GB;
Malcolm Mcculloch, Oxford, GB;
Nicholas Carpenter, Towcester, GB;
Simon Dowson, Towcester, GB;
Tim Woolmer, Oxford, GB;
Chee Yeow Leong, Oxford, GB;
William Treharne, Oxford, GB;
Malcolm McCulloch, Oxford, GB;
ISIS Innovation Ltd., Oxfordshire, GB;
Abstract
An electric machine () comprises a stator () and a rotor () mounted for rotation about a rotor axis () with respect to the stator. Permanent magnets () are carried by the rotor. The rotor has an output (). The stator has coils () wound on stator bars () for interaction with the magnets. The rotor has two stages () arranged one at either end of the stator bars, with two air gaps () between the ends of the bars and the rotor stages. An annular housing () retains and mounts the stator. A bearing () is between the rotor and stator, the rotor being hollow around said rotor axis. There are two significant magnetic flux paths (') of the motor. The first passes between adjacent coils in a circuit on a substantially circumferential plane with respect to the axis (). A second path′ is in an axial plane, passing around the bearing. The stator coils are spaced around the rotor axis and approach the rotor axis no closer than a first, stator radius (R) of the stator. The bearing comprises rolling elements rolling on a surface of the rotor that is no closer to the rotor axis than a second, rotor radius (r), which rotor radius is between 60% and 90% of the stator radius.