Introduction of a MR Rotor-Position Sensor for Off-Axis Application and Comparison to Competitive Technologies

Due to regulations which limit the CO₂ emission of passenger vehicles in the upcoming years, hybrid cars are becoming more and more important. In this paper different concepts of hybridization are discussed with a link to the properties of the electric machine behind these hybrid concepts. Upon the basis of a generalized principle of operation of an electric machine the influence of position and speed data, acquired by a rotary position sensor, is presented with a detailed analysis of various sensor concepts. Therefore the major products used nowadays are presented with a brief introduction to the underlying measurement principle. Additionally a new semiconductor-based sensor concept is introduced with high measurement accuracy and of small form factor. The survey is finalizing with a systematic analysis of the different sensing technologies - considering integration of the sensor concepts, magnetic immunity of the measuring principles, sensor-cost and analysis of sensor accuracy. The data used to estimate the sensor accuracy have been experimentally acquired on a test rig at various speeds - up to 15,000 rpm - considering and monitoring also dependency of the accuracy on the rotary velocity of the shaft.