Patent ID: 9182214
Filing Date: 2015-11-10
Classification: G01B,H02P

Abstract:
1. A method for the determination of the relative position of the rotor of an electronically-commutated synchronous machine, the machine having a stator with three phase windings, three rotor position sensors which are fixed to the stator and are configured to a commutation scheme of a first block commutation, wherein the rotor position is determined by read-out of data from the position sensors, the method comprising the steps of: rotating an off load rotor to a predefined angle by application of an appropriate voltage vector, the voltage vector being defined by a commutation scheme of a second block commutation after a first rotor position is determined; comparing a result of a second rotor position determination process with a rotor position anticipated as a result of the application of an appropriate voltage vector after the first rotor position is determined; determining the appropriate voltage vector by an association between the first rotor position and the voltage vector to be applied for the achievement of a desired rotation; and comparing the first rotor position and the second rotor position and utilizing the comparison between the first rotor position and second rotor position to improve accuracy of position identification of the rotor.