Patent ID: 8957698
Filing Date: 2015-02-17
Classification: G01R

Abstract:
1. A method for off-line testing of a multi-phase alternating current machine, which machine comprises at least two stator windings, and a rotor arranged along a rotation axis, which method comprises: determining, at a first rotor position, a physical stator quantity of each stator winding by applying a test signal to each stator winding, determining a first joint physical stator quantity by summing the physical stator quantities of the stator windings determined at the first rotor position, subsequently determining, at a second rotor position, a physical stator quantity of each stator winding by applying a test signal to each stator winding, determining a second joint physical stator quantity by summing the physical stator quantities of the stator windings determined at the second rotor position, comparing the second joint physical stator quantity with the previously determined first joint physical stator quantity, and determining a fault condition of said multi-phase alternating current machine if the first joint physical stator quantity differs from the second joint physical stator quantity.