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. 18, 2005
Filed:
Dec. 21, 2001
Hansjörg Berroth, VS-Obereschach, DE;
Frank Jeske, St. Georgen, DE;
Arnold Kuner, St. Georgen, DE;
Hans-dieter Schondelmaier, St. Georgen, DE;
Hansjörg Berroth, VS-Obereschach, DE;
Frank Jeske, St. Georgen, DE;
Arnold Kuner, St. Georgen, DE;
Hans-Dieter Schondelmaier, St. Georgen, DE;
ebm-papst St. Georgen GmbH & Co. KG, St. Georgen, DE;
Abstract
In a method for controlling a physical variable in an electronically commutated motor, current is supplied to the stator winding arrangement () of the motor in the form of current blocks. The interval (BW) between the switch-on command and switch-off command for controlling those current blocks, i.e. the length (BW) of the control signals, is influenced by a control apparatus, and the effective current value of those current blocks is influenced by setting a pulse duty factor (pwm). The length of the control signals is limited in both directions. If a control signal becomes shorter than a specified lower limit, the pulse duty factor (pwm) is decreased, so that the effective value of the current falls and the length (BW) of the current blocks is increased by the control system. If a control signal becomes longer than a specified upper limit, the pulse duty factor is increased, so that the effective value of the current rises and the length of the current blocks decreases in compensatory fashion.