Patent ID: 11870376
Assignee: ROBERT BOSCH GMBH
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method (100) for calibrating an offset angle (PhiO) of a field-oriented control of an electric machine (210) between an angle signal (W) of a position transducer (220) and the direction of the rotor flux (RF), the method comprising the following steps:
periodically varying (120) a current vector (Is) along a line of constant torque in a d/q coordinate system of field-oriented control;
ascertaining (130) a speed signal (n_t) of the position transducer of the electric machine (210); and
calibrating (140) the offset angle (PhiO) depending on the ascertained speed signal (n_t).