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:
Jul. 30, 1997
Applicant:
Inventor:
Siegfried Moeller, Rottweil, DE;
Assignee:
BDT Buro-und Datentechnik GmbH & Co. KG, Saline, DE;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G05B / ;
U.S. Cl.
CPC ...
318685 ; 318696 ;
Abstract
For driving a self-timing stepping motor which can be decelerated by an external load, a driving device presets a target step frequency and the motor is started with this target step frequency. The actual rotational speed of the stepping motor is determined and, as a function of this determined rotational speed, the target step frequency is changed when the rotational speed falls below a preset actual rotational speed of the stepping motor for a preset time interval.