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. 15, 2011
Filed:
Sep. 25, 2007
Takuya Okada, Kyoto, JP;
Noritaka Ishiyama, Mogami-machi, JP;
Takuya Okada, Kyoto, JP;
Noritaka Ishiyama, Mogami-machi, JP;
Murata Machinery Ltd., Kyoto-shi, Kyoto, JP;
GMC Hillstone Co., Ltd., Mogami-gun, Yamagata, JP;
Abstract
The present invention provides a linear motor device that can reduce a variation in thrust caused by a variation in attractive force. The linear motor device includes a linear motorand a control sectionthat controls the linear motor. The linear motorincludes a magnet membercomposed of permanent magnets having respective N poles and S poles alternately arranged in an axial direction, and a coil memberwhich is located orthogonally to the axial direction with respect to the magnet memberand through which the magnet memberis movable in the axial direction relative to the coil member. The control sectioncontrols current conducted through the coil memberso that a moving one of the magnet memberand the coil memberreciprocates within a use range L corresponding to a part of a pitch p between the magnetic poles N and S in the magnet member