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:
Feb. 27, 2001
Filed:
Sep. 20, 1999
Howard C Lovatt, Balmain, AU;
Peter Andrew Watterson, Denistone, AU;
Other;
Abstract
A high speed, brushless, DC motor has a rotor comprising a solid rare earth magnet core magnetized diametrically. The rotor includes a sleeve surrounding the magnet core to radially constrain the core during high speed rotation thereof. The sleeve extends axially in both directions from the core to form a hollow shaft for the rotor. The sleeve is formed of non-magnetic, low electrical conductivity material. Control circuitry is provided including an electronic inverter of a predetermined rating, the control circuitry including means to maintain substantially constant power through the range of motor speeds from a base speed to a maximum speed while maintaining a power factor close to 1.