In order to achieve the reliable running of PMSM under diversity fault conditions, and owing to the merits of dual six-phase PMSM (DSP-PMSM) and six-phase open winding PMSM (OW-PMSM), a motor winding structure that can transform between DSP and OW is proposed in this paper. Based on this, the control strategies under normal and fault-tolerant conditions are then investigated. The switch between the DSP mode and the OW mode under the stable dynamics is achieved under healthy conditions while keeping the same control strategy and modulation mode of the bidirectional thyristor. When there is a single-phase and partial two-phase open fault, the fault tolerant control will adopt DSP mode. On the premise that the control structure is unchanged, the fault tolerance strategy is implemented by adjusting the VSD coordinate transformation matrix as the principle of the total magnetic potential is preserved. In the case of upper two-phase open fault, open switch fault and short switch fault, the fault tolerance control will be implemented by OW mode. According to the dual inverter principle, to supplement the voltage drop, the remaining healthy switch should be fully utilized to achieve the fault tolerance control. The feasibility of the proposed dynamic switching strategy and fault tolerance control is proved by the simulation results.