The traceability of torque measurements on test benches for electrical machines is primarily established by the static calibration of a torque transducer. However, the loading conditions and signal processing methods are generally different for the static calibration and the measurement on a test bench. Therefore, the applicability of the calibration should be clarified before applying the calibration results for further analysis. In this paper, the torque measurement chain using a power analyser on a test bench for electrical machines is compared to the measurement chain used in the standard calibration procedure DIN 51309.

Permanent magnet synchronous machines (PMSMs) fed with frequency converter faces higher order harmonics signals which results higher eddy current losses in permanent magnets (PMs). This eddy current losses in the PMs leads to overheating causing irreversible demagnetization of PMs during the operation of the machines. One of the goals in machine design for the safe operation is to measure the total eddy current loss and minimize overheating of PMs. In this paper, measurement methods with a focus on measurement sensors and a finite element method (FEM) simulation for the eddy current loss (i.e. PM loss) of PMSMs are presented and compared.

Torque measurements that account for the influences of temperature and rotation are vital in determining the efficiency of rotating electrical machines on test benches. During experimental efficiency measurements, the influences of temperature and rotational speed generate errors in the torque measurements that could also affect the overall traceable efficiency measurement on test benches. In this paper, experimental efficiency mapping results with a focus on the influence of rotation and temperature on torque measurements are presented.