Fast estimation of the dynamic start-up behavior of Line-Start Synchronous Reluctance Machines with modern rotor designs
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Date
2025
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Abstract
Line-Start Synchronous Reluctance Machines are considered a more efficient and sustainable alternative to the widely used Induction Machines. However, the research has been impeded by the lack of appropriate simulation models, as most of the studies only use the time-consuming transient two-dimensional Finite Element Method. This thesis aims to fill this gap by presenting an improved numerical parameter model that can support the development process of Line-Start Synchronous Reluctance Machines in a fast and accurate way. The focus is on machine designs, in which the conductors are placed within the flux barriers.
First, a circuit-coupled two-dimensional Finite Element model is derived. In this context, a 3D Finite Element-based method is introduced with which the end ring parameters can be calculated accurately. It is demonstrated that it is also important to take the skin effect into account for the end ring. This has a major influence on the rotor cage, as the bars are usually much deeper than in classic Induction Machines. In this model, the
effect is considered by applying the multi-layer method, which divides the rotor cage into multiple separate cages to account for the changing resistance and inductance.
Secondly, an existing numerical parameter model is adapted to be applied to nonstandard rotor cage geometries of Line-Start Synchronous Reluctance Machines. Especially the consideration of skin effect and saturation are improved. For the skin effect, the multi-layer method is adopted from the Finite Element model. For the saturation, on the other hand, the existing global saturation factor method is extended to a dq-saturation
factor method, which takes the different saturation behavior of the machine’s d- and qaxis into account. The validation with measurements and the Finite Element model prove that both methods can significantly improve the accuracy of the model with regard to the
studied effects.
The research results represent a further step towards developing fast and accurate simulation models that can enhance the design process and therefore the development of Line-Start Synchronous Reluctance Machines. In particular, the numerical parameter model turns out to be faster from the first start-up simulation on, as it takes minutes instead of hours for one single start-up as soon as the parameters for the model have been
determined.
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Keywords
Direct-on-line, LSSRM, LS-SynRM, Parameter model, Analytical model, Line start, Reluctance motor, IE5
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Reluktanzmotor