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

Abstract

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.

Review of Fault Tolerant Multi-Motor Drive Topologies for Automotive Applications

“…As for automotive applications, independent and stable motor control and high motor efficiency are typically required, thus PCM and SCM topologies would be undesirable. Nonetheless, some efforts have been made to make it suitable but issues with parameter variation, dynamic performance and real-time efficiency optimization remain to be solved [36,37]. However, in cases where motors are sharing the same shaft (i.e., speed physically synchronized), such as segmented motors, the issues of the PCM topology are greatly reduced [38].…”