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:
Jul. 07, 2009
Filed:
Feb. 08, 2005
Yoshichika Kawashima, Kiryu, JP;
Shunji Kumagai, Kiryu, JP;
Yoshichika Kawashima, Kiryu, JP;
Shunji Kumagai, Kiryu, JP;
Mitsuba Corporation, Gunma, JP;
Abstract
In an electric motor having high-speed and low-speed brushes, durability is improved and vibration/noise is reduced. The electric motor has a low-speed brush, a high-speed brush, and a common brush. Formed in the electric motor are a first coilAwhich is wound between given slots, and a second coilAwhich is wound in a direction opposite to a direction of the first coilAbetween slotsexisting at positions point-symmetric to the given slotswith respect to a center of a rotation shaft. An armature coilis formed by the first and second coilsAandA. If the armature coilis short-circuited by the high-speed brush, the first coilAand the second coilAof the short-circuited armature coilexist at positions symmetric to each other with respect to an axis line extending through the center of the high-speed brushand the center of the rotation shaft.