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:
Aug. 11, 2009
Filed:
Jan. 19, 2007
Toshinari Maeda, Saitama, JP;
Toshinari Maeda, Saitama, JP;
Citizen Holdings Co., Ltd., Tokyo, JP;
Abstract
A magnetic drive apparatus, which has a rotor; and a stator having a stator magnetic flux generator, and a stator magnetic guidepath for guiding magnetic flux from the stator magnetic flux generator to the rotor, and which rotationally drives the rotor relative to the stator by controlling the flow of the magnetic flux of the stator magnetic flux generator, the magnetic drive apparatus being constituted such that it further has magnetic flux controlling means, which is respectively stacked onto and bridges the rotor side end tip of the stator magnetic guidepath and a magnetic pole tip which is arranged at a prescribed angular location on the periphery of the rotor with a first gap with this end tip part, and magnetic flux controlling means has a function for magnetically reconnecting to the magnetic pole tip after controlling the flow of magnetic flux, which is blocked by the first gap. Consequently, there is no need for an excitation coil, power consumption is lowered by reducing the consumption of energy due to the copper loss of the excitation coil and so forth, and the driving apparatus can be made smaller, thinner and less expensively regardless of coil diameter.