A MTPA Control Strategy for Mono-Inverter Multi-PMSM System

Making electrical driving systems cheaper, lighter, and more reliable is the consistent pursuit of current research and development. Mono-inverter multipermanent magnet synchronous motor systems tend to share the static converters in electromechanical systems by connecting machines in parallel. This type of system has an obvious advantage in overall weight and cost. In this article, we have proposed a new maximum torque per ampere (MTPA) control strategy for a MIMPMSM system, which supports three or more machines in parallel and works both in motor mode and brake mode. The calculation of the MTPA point minimizing the overall joule loss of the system is also given. The synchronization condition, stability, and optimal efficiency of the system are strictly proven. This new control structure is simple making current single PMSM systems easy to upgrade to support the MIMPMSM system. The experiment has demonstrated its feasibility, stability, and improvements in efficiency.