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:
Feb. 27, 2001
Filed:
Aug. 06, 1999
Applicant:
Inventor:
Robert Mainberger, Braunfels, DE;
Assignee:
Leica Microsystems Wetzlar GmbH, Wetzlar, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02P 8/00 ;
U.S. Cl.
CPC ...
H02P 8/00 ;
Abstract
A method and an apparatus for driving a stepping motor is provided. Digital desired current values are stored in the form of a sine table and are read from the sine table at a constant sampling frequency. The intervals between the read-out table values can be varied equally and unequally. The digital desired current values are converted into discrete analog signals. A sinusoidal signal is reconstructed from the analog signals. A motor current for exciting a phase of the stepping motor is derived from the sinusoidal signal.