Special features of chassis dynamometers in climatic cells
Chassis dynamometers intended to operate over the temperature range +40 to −10?C call for no special features, apart from sensible precautions to deal with condensation; for temperatures below this range and particularly those working below −25?C certain special features will be required.
Until the compact ‘motor between rollers’ (‘motor-in-middle’ in USA) design of dynamometer became common, the dynamometer motor in climatic cells was often isolated from the cold chamber and operated at normal temperatures. With the new designs two quite different strategies can be adopted to prevent low temperatures causing temperature related variability in the dynamometer system.