TAF PUBLISHING

This paper introduces a novel, advanced approach to evaluate and benchmark different types of state-of-the-art rotor position sensors for electric drive train systems. It has been well recognized that the reduction of overall emissions produced by transportation systems plays an important role. Cars containing an electrical powertrain are getting more and more widespread in different markets worldwide. Research nowadays is concerned with developing more efficient electrified powertrain systems that can reduce CO2- and harmful emissions. For an efficient and optimized motor control, it is crucial to measure the electric machine's exact rotor angular position and speed. The state-of-the-art rotor position sensor technology used in electric drive trains represents the resolver, which is the investigated sensor type in this research work. To find the most suitable resolver type for a specific powertrain application and so to optimize the overall propulsion control, various kinds of multispeed resolvers from different manufacturers are gauged regarding electrical parameters, that the producer does not define by default. Electrical measurement principles are applied, e.g. to determine the sensor’s input and output impedance, establish the transfer function based on the transformer equivalent circuit, specify the phase delay, and the electrical characteristic's temperature behavior. These evaluations are done on a unique, highly accurate sensor test bench and extend the state-of-the-art rotor position sensor characterization [1-4]. The mentioned test bench enables to gauge various kinds of sensors under different mechanical-, speed- and temperature conditions. The new, advanced approach enables a detailed determination of all relevant sensor parameters that are needed to operate an efficient motor control. Furthermore, the methods supports detailed benchmark with the target to determine the most accurate resolver. In addition, the resulting knowledge of the sensor parameters enables further innovative investigations e.g. to determine indirect measured quantities.