Abstract: A nine-switch converter space vector pulse width modulation（SVPWM）algorithm was proposed

based on the dual Y shift 30° permanent magnet synchronous motor（PMSM）voltage vector. Compared with the

biggest four vectors of the twelve-switch converter SVPWM algorithm，the proposed algorithm not only reduces

three switch tubes，but also reduces switching loss. The dead zone modulation strategy was proposed aiming at the

rapid sampling period of the nine-switch converters which can lead to the voltage short-circuit of the DC side. The

simulation results show that the proposed algorithm can effectively applied to dual Y shift 30° permanent magnet

synchronous motor.

      Key words: dual Y shift 30° permanent magnet synchronous motor ；space vector pulse width modulation

（SVPWM）algorithm；switching loss；dead-time modulation