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Industrial applications often require two (or more) variable speed electric drives, which have to be controlled independently. An example is a centre-driven two-motor winder, where ac machines are traditionally supplied from their individual three-phase voltage source inverters (VSIs). Over the past decade research efforts have been made to reduce the number of power electronic devices required in multi-motor drive systems in order to reduce the complexity and hence cost of the drive. One such configuration consists of two three-phase induction machines, supplied using a five-leg VSI, with one inverter leg being common to both machines. A PWM method for the five-leg VSI control, which enables an arbitrary distribution of the available dc link voltage between the two machines, has been recently developed and its suitability for application in a two-motor centre-driven winder has been demonstrated by simulation. This paper reports results of the practical realization of this drive system. In the first stage the two-motor drive supplied from a five-leg VSI is built and tested by performing the winder emulation experiments under no-load conditions. Suitability of the configuration for real winder system is thus demonstrated. In the second stage the complete two-motor centre-driven paper winder is built and results of the experimental testing are provided. The advantages of the analyzed solution over the standard one are also addressed.
Herbert Shea, Sylvain Thomas Schaller