A Study on the Down-Scaling of Transient Drive Cycles for Experimental Analyses With Laboratory Based Small Motors

Standardised drive cycles are commonly used to assess passenger and other vehicles' performances. However, real vehicle drive cycles cannot be tested in laboratories with smaller machines because of torque and speed range limitations. Thus, for experimental analysis in the laboratory, these drive cycles need to be scaled down. This paper presents a method of down-scaling such transient cycles, maintaining information on the cycles' transient characteristics, to enable experimental investigations of real vehicle driving scenarios in small laboratory-scale settings. It examines the method's suitability to analyse the machine performances in terms of electrical energy conversion and thermal aspects, and thus subsequently the influence of different control and operation approaches. Three test case speed-over-time drive cycles are chosen and analysed for the cases of two different electric vehicles (EVs). The down-scaling method is studied with respect to two different laboratory-based test case motors: a permanent magnet synchronous motor (PMSM) and an induction motor (IM). Thus, a total of 12 example case scenarios are considered.