Analysis of a wide speed range open winding IPM with floating bridge

In this paper two independent inverters are used to extend the Constant Power Speed Region (CPSR) for a concentrated open winding IPM synchronous motor (IPMSM). The IPMSM uses a v-shaped magnet arrangement on the rotor and is optimized to provide constant power over a speed range up to eight times rated speed. The circuit uses an inverter connected to a DC supply (the main bridge) and a floating DC link (the floating bridge). Applying this circuit the theoretical constant power region can be extended to above 11 times the base speed. Finite Element Analysis (FEA) is employed to evaluate the machine performance and its different parameters with the dual inverter structure. Loss analysis and Efficiency analysis show the promising performance of the designed machine in single and dual inverter drive in wide range of operational speeds.