Flux-linkage characteristics and torque characteristics (versus current and rotor position) of switched reluctance machines (SRM) can be regarded as the fingerprint of SRMs because they are indispensable fundamental data to model machine behavior for both simulation and control proposes. In contrast to other types of electrical machines, e.g. induction machines and synchronous machines, SRMs are basically characterized by a strongly nonlinear behavior due to typical operation in the magnetic saturation region. Hence, no analytical functions can be applied to describe the characteristics of SRMs precisely. An accurate SRM model inevitably needs the complete machine characteristics in form of data-intensive look-up tables to represent the machine behavior. Basically, the SRM characteristics can be calculated by Finite Element (FE) simulation. However, real SRM characteristics can be different from the simulation model due to secondary effects, e.g. non-uniform material and manufacturing tolerances, which are normally not considered in the FEsimulation model. Therefore, the experimental measurement is preferred. Measuring and preparing the SRM characteristics is a complicated and time-consuming task. The time-expense as well as possible human errors in determining the SRM characteristics can be greatly minimized, if the measurement procedures are automated.
This paper presents an automated characteristic measurement system for determining SRM characteristics experimentally. The measurement system was designed for automotive class SRMs, e.g. starter-generators, hybrid or main propulsion motors. The applied measurement methods, the system design and construction are described in the paper. Furthermore, constraints and discussions concerning the measurement accuracy are treated.
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