Patent ID: 6100823
Filing Date: 2000-08-08
Classification: G01D,H02K,H02P,H03M

Abstract:
A rotor position encoder for an electrical machine including a rotor and a stator, the encoder comprising a member defining a set of features, mountable to rotate with the rotor, a single sensor, the single sensor of the encoder being arranged to be influenced by the features to produce a cyclical sensor output signal at a first resolution indicative of the position of the rotor, and a device arranged to be enabled by a plurality of points in each cycle of the sensor output signal produced by the single sensor, to produce a device output signal at a second higher resolution indicative of the incremental position of the rotor within a cycle of the sensor output signal produced by the single sensor, both the cyclical sensor output signal and the device output signal thus being based on the single sensor.