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:
Dec. 25, 2001
Filed:
Mar. 01, 2000
Kosei Nakamura, Susono, JP;
Michi Masuya, Oshino-mura, JP;
Hisashi Maeda, Oshino-mura, JP;
Shinpei Uemura, Minamitsuru-gun, JP;
Fanuc LTD, Yamanashi, JP;
Abstract
An induction motor capable of obtaining a high power characteristic in a wide range without producing induced voltage. A winding for each phase is composed of a plurality of winding components having the same number of turns. When high torque is needed with low speed rotation, a Y-connection in which winding components for each phase are connected in series is formed as shown in FIG.,. For medium low speed rotation, a &Dgr;-connection in which winding components for each phase are connected in series is formed as shown in FIG.,. For medium high speed rotation, a Y-connection in which winding components for each phase are connected in parallel is formed as shown in FIG.,. For high speed rotation, a &agr;-connection in which winding components for each phase are connected in parallel is formed as shown in FIG.,. Using the entire winding for each phase, the number of turns is decreased stage by stage to switch from low speed rotation to high speed rotation. Since there is no unused part of windings, there is no problem of induced voltage. A fall in power at the time of switching the winding formation can be restrained, so that a high power characteristic can be obtained in a wide range.