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:
Jan. 30, 2001
Filed:
Sep. 29, 1994
Sebastiano Acquaviva, Pino Torinese, IT;
Motors Acquisition Corp., Southfield, MI (US);
Abstract
A brushless electric motor has a rotor carrying a plurality of permanent magnet elements uniformly spaced apart and a stator armature separated from the rotor by a circumferential air gap of uniform thickness and having a plurality of uniform slots provided therein at equally spaced intervals and facing the air gap. The cogging torque associated with the motor is reduced by bevelling the inner corners of the magnet elements and spacing the magnet elements apart at a desired spacing so as to provide a desired distribution for the density of magnetic energy stored in the air gap. Magnetic flux conductors may also be disposed on the magnet elements to affect the distribution of the density of the magnetic energy stored in the air gap.