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:
Oct. 03, 2000
Filed:
Nov. 23, 1998
Applicant:
Inventors:
Paul C Colby, Sunnyvale, CA (US);
Ken Q Mac, San Jose, CA (US);
Assignee:
Electroglas, Inc., Santa Clara, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02P / ;
U.S. Cl.
CPC ...
318 38 ; 318135 ;
Abstract
A system is disclosed for correcting for rotational errors in a linear motor system. A shunt resistor is coupled in parallel with a winding of a phase of a motor of the linear motor system to correct for rotational errors caused by differences in the magnetic characteristics of the motors comprising the linear motor system. Yaw error values for the motors are sequentially measured to determine the value of the shunt resistor, and its location on a winding of a phase motor of the linear motor system.