A 60 hp brushless doubly-fed machine (BDFM) pump drive, which isdesigned to replace an existing wound-rotor induction machine (WRIM)drive in a waste-water treatment plant, is discussed. Machine structuraldesign as well as controller design are optimized according to theoperational demands of the application. This paper focuses mainly on thecontroller design and implementation for the BDFM pump drive, in alimited-speed range of operation. The performance characteristics of theexisting WRIM drive and the projected characteristics of the BDFM driveare presented. The microprocessor based drive controller is capable ofperforming start-up synchronization, speed control and near unity powerfactor operation, Additionally, the controller generates a shut-downsignal during fault conditions such as power failure and loss ofsynchronism. Experimental results obtained from a low-power laboratoryprototype BDFM are presented to verify the 60 hp design
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