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BDFM is a new AC motor, it eliminates the brush and slip ring has a simple structure, speed performance, the advantages of the inverter capacity. Two independent windings in the stator, called power winding and control winding; the traditional rotor type squirrel cage rotor and reluctance rotor. However, the traditional rotor coupling capability is poor, making BDFM efficiency and power density are low. Therefore, the design of a high coupling capacity rotor brushless doubly-fed machine control system and hydraulic wind power and other fields of application and development of great significance. In response to these problems, this paper the following research. First, the comparative analysis of different rotor coupling. Based on the common salient pole reluctance rotor, improved reluctance rotor and mixing rotor. Improved reluctance rotor is an increase in the common salient pole reluctance rotor deep grooves, obtained improved reluctance rotor pole arc coefficient, tooth depth, deep trench width and length of the deep grooves, deep channel number to determine programs. Mixing rotor is improved reluctance rotor design to increase short-circuit the bar in the deep grooves to further restrict the harmonic flux path analysis, mixing rotor coupling has been greatly improved. The operating principle of the new wound rotor for new wound rotor BDFM dynamic performance shortcomings, an improved program. Secondly, through the inductor parameters to further verify the ability of the coupling of the rotor. Comparative analysis based on the \Calculation of common salient pole reluctance rotor the BDFM inductance parameters were analyzed, and the conclusion. To calculate the mutual inductance between the different rotor brushless doubly-fed motor power winding and control winding, further validation of the coupling of the rotor. Finally, according to the requirements of the project, the development of an improved reluctance brushless doubly-fed machine. In the stator structure design, through the internal diameter of the stator, the tooth width of the yoke design, identified by a the best stator structure. Identified by two sets of windings in the stator winding design, pitch, number of turns, wire and power winding and the control winding position. In the structural design of the rotor, by the design of the rotor pole arc coefficient, the tooth depth, the deep trench size, determine the optimal structure of the rotor. BDFM synchronous speed and the two operating conditions of the non-synchronous speed and network operation simulation.
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