Patent ID: 8928312
Filing Date: 2015-01-06
Classification: G01D

Abstract:
1. A method for monitoring the determination of a rotor angle of a rotating shaft via a resolver, wherein the resolver comprises: a first stator winding; at least one second stator winding, whose winding axis is rotated through a predetermined angle with respect to the winding axis of the first stator winding, and at least one rotor winding, which is connected to the rotating shaft such that they rotate together, wherein for determination of the rotor angle: a first exciter AC voltage at an exciter frequency and with a first amplitude is applied to the first stator winding; a second exciter AC voltage at the exciter frequency and with a second amplitude is applied to the at least one second stator winding; and the first amplitude and the second amplitude are produced via a regulator such that no voltage is induced in the at least one rotor winding as a result of the first and the second exciter AC voltages in a stationary state, wherein a manipulated variable of the regulator maps the rotor angle, wherein the method for monitoring the determination of the rotor angle comprises the steps of: applying a first test AC voltage at a test frequency which is not the same as the exciter frequency to the first stator winding, and applying a second test AC voltage at the test frequency to the at least one second stator winding, wherein the first and the second test AC voltages are produced such that an AC voltage is induced all the time in the at least one rotor winding as a result of the first and the second test AC voltages.