Maximum Efficiency Control of Brushless Doubly-Fed Reluctance Motors for Large Pump Applications
The inverter-fed brushless doubly fed reluctance machine (BDFRM) is undoubtedly an attractive solution for medium performance variable speed applications due to its low cost, high reliability and lower harmonic injection into the mains The cost effectiveness and improved power quality of a BDFRM drive can be attributed to the slip power recovery property of the machine which allows a smaller inverter to be used, and especially in cases when the speed range required is relatively limited (typical examples are pumps  and wind turbines [2 3]). However, because of its modest torque per volume ratio, resulting from the unusual operating principle  and unconventional design’ (Fig. 1), a larger, and therefore more expensive, BD-FRM is needed to achieve the torque output of a synchronous reluctance (Syncrel) or cage induction machine . Nevertheless, despite this deficiency, the total system cost can still be substantially reduced in larger drives (up to about 30%) by significant savings that can be made in the power electronics .
KeywordsWind Turbine Torque Output Induction Machine Secondary Current Copper Loss
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