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:
Aug. 24, 2010
Filed:
Nov. 17, 2006
Roland Walter, Tiefenbronn, DE;
Bastian Kloer, Stuttgart, DE;
Klaus Dengler, Kornwestheim, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
The invention relates to a method and a circuit for regulating the speed of a commutator series-wound motor, especially a universal motor (), which is supplied with a current from an a.c. voltage source () by means of a semiconductor switching element () mounted in series with an armature winding () and a field winding () and controlled by a control unit () according to a nominal speed value. The control unit () receives, as input signals, signals corresponding to the total voltage drop (Umot) when the motor () is supplied with a current, and a substitute signal for the intensity of the motor current (I), corresponding to the voltage drop (Ua, Ufa) on the armature () alone or on the armature () and on a part () of the field winding (). The input signals of the control unit () are compared with motor-typical characteristic lines of the voltages on the excitation field () and/or on the armature, stored in the control unit, and control signals for the semiconductor switching element are formed from the deviations.