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. 15, 2023
Filed:
May. 07, 2020
Robert Bosch Gmbh, Stuttgart, DE;
Ulrich Vollmer, Weilheim, DE;
Marco Roetzer, Epfendorf, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A method determines a rotor position of an electric rotating machine which is fed by a PWM-controlled inverter. Specific injection voltages, which are composed of predefined voltages and high-frequency voltages, are converted into corresponding PWM duty factors by a controller and the inverter is correspondingly actuated with these PWM duty factors. Current profiles of phase currents are then determined by measuring at least one first phase current and at least one second phase current. The measurement is carried out within a PWM period, in each case in the chronologically last third of a passive switched state. The rotor position is then determined in accordance with the ascertained current profiles and the fed-in high-frequency voltages.