Research on Brushless Doubly-Fed Motor for Direct-drive Screw Pump

The Brushless Doubly-Fed Motor (BDFM) is a special machine having some typical characteristics similar to the synchronous machine. Due to absence of brush, commutator and permanent magnet, BDFM can avoid annular fire and permanent magnet demagnetization, which make it more suitable for direct-drive technology of screw pump. Nowadays, there are many control devices are recommended to meet the requirements on the screw pump performance and the reliability in the field of petroleum exploration. In this paper, vector scheme is implemented on running and braking condition of the BDFM for direct-drive screw pump. Simulation results verify the good performance of BDFM in this type of control strategy.