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:
Nov. 02, 2004
Filed:
Jun. 04, 2001
Tomonaga Yamamoto, Yamanashi, JP;
Takuya Maeda, Yamanashi, JP;
Fanuc Ltd., Yamanashi, JP;
Abstract
A rotor for a synchronous motor capable of increasing output torque and reduce inductance. An outer periphery of each pole of the rotor in a cross section perpendicular to an axis of the rotor is defined on the basis of a curve of a hyperbolic function. Since an outer periphery of one pole of the rotor at a central apex portion is substantially identical with that of a conventional rotor defined by a circular arc, the output torque of the synchronous motor using this rotor is not decreased. At side portions adjacent to the central apex portion, the outer periphery is positioned inner, i.e., closer to the axis of the rotor than the outer periphery defined by the circular arc, so that a gap between the outer periphery of the rotor and an inner periphery of a stator is made greater to reduce the inductance of the synchronous motor.