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:
Jul. 16, 2024
Filed:
Sep. 12, 2022
Applicant:
Andreas Stihl Ag & Co. KG, Waiblingen, DE;
Inventors:
Assignee:
Andreas Stihl AG & Co. KG, Waiblingen, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02P 6/00 (2016.01); H02K 7/14 (2006.01); H02P 6/182 (2016.01);
U.S. Cl.
CPC ...
H02P 6/182 (2013.01); H02K 7/145 (2013.01);
Abstract
A method for ascertaining, without an encoder, a rotational angle position of the rotor of a brushless DC motor, includes the steps of: detecting a voltage induced in a stator of the brushless DC motor; checking whether the voltage induced in the stator is lower than a threshold value; and if the induced voltage is lower than the threshold value, then ascertaining an initial rotational angle position of the rotor based on an Indirect Flux detection by Online Reactance Measurement, and subsequently updating the rotational angle position proceeding from the calculated initial rotational angle position using at least one continuous test signal.