Abstract
Winding design methods have been a subject of research for many years of the past century. Many methods have been developed, each one characterized by some advantages and drawbacks. Nowadays, the star of slots is the most widespread design tool for electrical machine windings. In this context, this paper presents a simple and effective procedure to determine the distribution of the slot EMFs over the phases and of the winding configuration in all possible typologies of electrical machines equipped with symmetrical windings. The result of this procedure gives a Winding Distribution Table (WDT), which can be used to define coils and coil groups connections and also to simply implement winding optimizations techniques, such as zone widening, imbrication, etc. Moreover, this procedure can be easily implemented on a computer in order to perform automated winding designs for rotating electrical machines. Several examples are provided in order to validate the proposed procedure.
Highlights
Over the last century, several procedures for the design of the windings of electrical machines have been proposed in the literature
We propose a simple, powerful and general procedure, that can be considered as an alternative to the method based on the star of slots, suitable for all symmetrical winding configurations, covering concentrated topologies and even reduced or normal systems [22,33]
In any case, a minus sign is added to the shifted columns, so that the coil sides with the negative electro-motive forces (EMFs) can be explicitly visualized within the Winding Distribution Table (WDT)
Summary
Several procedures for the design of the windings of electrical machines have been proposed in the literature. Malti and Herzog developed a rather complex method, based on the use of tables, requiring the distinction of at least types of winding and the construction of the same amount of tables This treatise covers only non-reduced multi-phase systems, omitting reduced ones, which, in truth, had not significant importance at that time. But it does not seem to be suitable for implementation of interspersing techniques [24,32] In this context, we propose a simple, powerful and general procedure, that can be considered as an alternative to the method based on the star of slots, suitable for all symmetrical winding configurations, covering concentrated topologies and even reduced or normal (radial symmetrical) systems [22,33].
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