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:
Sep. 13, 2011
Filed:
Jul. 05, 2007
Johannes Schwarzkopf, Marktheidenfeld, DE;
Karsten Lohse, Wuertburg, DE;
Pietro DE Filippis, Milan, IT;
Johannes Schwarzkopf, Marktheidenfeld, DE;
Karsten Lohse, Wuertburg, DE;
Pietro De Filippis, Milan, IT;
Abstract
The invention relates to a method carried out with simple means for determining the position of the rotor in a sensorless and brushless multi-phase electric motor () in addition to a device particularly suitable for carrying out said method. According to said method, a phase voltage (U) on the clamping side on said motor phase is to be detected after clamping a first motor phase (V) from the reference potentials (U,M) of an intermediate circuit () during a detection period (T), via which the detection period (T) determines a peak value (U*) of the detected phase voltage (U), the peak values (U*) are to be compared to the comparative value (U), and a positon signal (S) is to be produced when the peak value (U*) exceeds the comparative value (U0). The comparative value (U) is then determined digitally such that it corresponds to the value of the phase voltage (U) at a zero crossing of a voltage (U) induced in the first motor phase (V) or an increased or lowered value in relation to a predefined correction value (ΔQ).