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:
Mar. 30, 2004
Filed:
Aug. 09, 2001
Tadao Yamaguchi, Isesaki, JP;
Tokyo Parts Industrial Co., Ltd., Isesaki, JP;
Abstract
The present invention provides a disc-shaped eccentric rotor having at least two air-core coils. The rotor includes a flat commutator member having a central shaft insertion through hole, commutator land segments arranged around the shaft insertion through hole on a first side of the flat commutator member, wound air-core coil arrangement guides located around the shaft insertion through hole on a second side of the flat commutator member, air-core coil end portion connection lands arranged circumferentially on the second side of the flat commutator member, a shaft holder installed around the shaft insertion through hole on the second side of the flat commutator member, and wound air-core coils installed at the wound air-core coil arrangement guides and having end portions connected to the air-core coil end portion connection lands. The air-core coils of bigger sizes are uniformly arranged on the commutator member, so that high efficiency and easy Installation can be achieved. The arrangement of the air-core coils offsets the center of gravity from the geometrical centroid of the rotor, and there is no need for an additional eccentric member. Since the printed wiring air-core coil is thinner than the wound air-core coil, an eccentric weight is installed on the printed wiring air-core coil so that a great amount of vibration may be obtained during rotation of the rotor.