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. 30, 2014
Filed:
Apr. 05, 2010
Junichiro Iwaki, Tokyo, JP;
Junichiro Iwaki, Tokyo, JP;
THK Co., Ltd., Tokyo, JP;
Abstract
Provided is a linear motor actuator capable of oscillating a mover without using mechanical resilience of an elastic body. A first permanent magnetand a second permanent magnetmagnetized in an axis direction are disposed in a moverin the direction of the axis. A first coiland a second coilare disposed in a statorso as to surround the first permanent magnetand the second permanent magnet, respectively. Alternating currents having the same phase are applied to the first coiland the second coilsuch that the phase of thrust generated in the first coiland that of thrust generated in the second coilare shifted from each other. At this moment, a center-to-center pitch LCbetween the center of the first coiland that of the second coilin the axis direction differs from a pole-to-pole pitch LMof the mover.