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:
Sep. 28, 1999
Filed:
Nov. 17, 1997
Applicant:
Inventor:
Kil H Cho, Changwon, KR;
Assignee:
LG Industrial Systems Co., Ltd., Seoul, KR;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02K / ;
U.S. Cl.
CPC ...
310 12 ; 318135 ;
Abstract
A linear motor includes a coil unit, and a movement unit including a magnetic planar body facing against the coil unit, wherein a changeable clearance .delta. is formed between the magnetic planar body and a plurality of lamination core protrusions in the coil unit, and a nonmagnetic planar body attached onto an upper surface of the magnetic planar body. The linear motor enables a speed control without an electrical current in its applied system such as an elevator, thereby excluding an additional current control system.