The brushless doublyfed motor (BDFM), without a brush gear, provided the benefits of low maintenance cost and high reliability, so it had broad application prospects in the field of variablespeed constantfrequency (VSCF) wind power generation. Because of its special structure and principle of operation, the mathematical models of BDFM were very complicated. Based on multiloop space vector model of BDFM, a new method to derive static reference frame models of the power winding and the control winding was proposed, and the coordinate conversion between them was given. The derivation was simple and clear. The conclusions provided a theoretical basis for the theoretical analysis and control strategy of BDFM. The simulation results in MATLAB/Simulink showed that the static reference frame models and coordinate transformation were correct.