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, 2003
Filed:
Jan. 29, 2002
Applicant:
Inventor:
Daisuke Shinohira, Tokyo, JP;
Assignee:
Sumitomo Heavy Industries, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06F 1/900 ; G05B 5/00 ; G05B 1/300 ;
U.S. Cl.
CPC ...
G06F 1/900 ; G05B 5/00 ; G05B 1/300 ;
Abstract
In a thrust ripple measuring apparatus for use in a linear motor, a slave linear motor as a subject to be measured is coupled with a master linear motor through a non-contact type stage mechanism. A processing unit is supplied with speed-induced-voltages detected by a voltage detector and a moving speed of the slave linear motor detected by a speed detector and calculates a per-phase induced voltage constant from the ratio of the speed-induced-voltage of each phase and the moving speed and further calculates a thrust constant and a thrust ripple from the calculated per-phase induced voltage constant.