Graduate Thesis Or Dissertation
 

Analysis and design of the brushless doubly-fed machine

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  • Use of conventional induction machines (IM) in adjustable speed drives (ASD) has increased in recent years. Electronic power processing has facilitated this increased use. The IM is an inexpensive and robust machine, but when used as part of an ASD, the cost of the system increases due to the inclusion of the power electronic converter. By using a single frame cascade induction machine (also referred to as a Brushless Doubly-Fed Machine or BDFM), which was first introduced in 1907 by Hunt [1], in conjunction with a power electronic converter, an alternative ASD system can be developed. The BDFM allows lower overall system cost since the power electronic converter is only required to process a fraction of the total power. The bulk of the power is fed directly from the 60 Hertz utility supply to the terminals of the machine. Redacted for Privacy This thesis details the analysis of the EDFM by use of computer simulation; the simulation is an updated detailed model first described by Wallace et al. [8-9]. The program gives time domain information on stator and rotor component currents as well as mechanical shaft speed. Development of a brushless castable rotor is presented. Design improvements to the basic rotor are discussed by changing rotor loop spacing and removal of rotor bars. Stator design is explored by varying the span and distribution of a double layer winding which allows two fields of different pole number to be produced by one stator. Further, employment of two isolated stator windings is discussed. Finally, predicted performance of the machine by simulation is compared qualitatively with actual machine measurements from a physical prototype to highlight the use of the simulation as a design tool.
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