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:
Jan. 29, 2002
Filed:
Aug. 09, 2000
Waldemar Stephan, Dortmund, DE;
Steffen Katzer, Sprockhövel, DE;
Wilo GmbH, Dortmund, DE;
Abstract
Disclosed is a method of starting an electronically commutated DC motor including a stator having at least one winding and a rotor. The winding is excited with at least one initial start pulse having a voltage and a repetition frequency which are sufficient to ensure rotation of the rotor under a maximum load in normal operation. Back EMF generated in the winding by the rotation of the rotor is detected. If the back EMF is detected, the rotation of the motor is controlled based on the detected back EMF. If the back EMF is not detected, the voltage of the at least one initial start pulse is increased until any of (i) the back EMF is detected, (ii) a current generated in the winding by said at least one initial start pulse reaches a maximum acceptable current level, and (iii) the voltage of said at least one initial start pulse reaches a maximum acceptable voltage level. In the latest instance, supply of the at least one initial start pulse to the winding is discontinued.