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As the prototype testing showed. the proposed operation method of the PMSM in dual-inverter topology at a single phase AC grid achieved performances. which are comparable to drive system solutions with an active PFC stage. The benefit of this solution is the displacement of additional PFC inductors. These inductors are responsible for a large percentage of costs and installation spaces in conventional topologies with active PFC circuits. Instead an additional three-phase bridge is necessary. which slightly reduces the overall efficiency of the drive system. Also an adaption of the winding is required. to reach the rated machine power. Due to the reduction of the number of turns compared to the normal design criteria and the resultant decreasing of the machine inductance. the phase current ripple increases. Nevertheless the proposed operation method may achieve advantages in the matter of cost and installation space reduction of the drive system in various applications. The decision. which system design is to prefer depends on the circumstances of the drive task. Another aspect is the safety reason concerning braking torques at failure states of the machine. In the case of a winding short-circuit event. machines with neutral point connections generate major braking torques which can harm the application requirements. The dual-inverter topology offers the possibility of open-end phase connections and can therefore prevent braking torques in failure cases.
