Overview of Dual Mechanical Port Machines in Transportation Electrification

Electrical machines based on dual mechanical port (DMP) structures are widely used to increase the overall efficiency and power factor, to increase the speed/torque, or to distribute or combine the energy from different ports flexibly. Today, DMP machines have increasing applications in the field of transportation electrification with the advantages of structural compactness, design flexibility, and high efficiency. By analyzing from fundamental principles to advanced controlling strategies, this article aims to provide a comprehensive overview of existing DMP topologies. In this article, the pros and cons of all topologies are analyzed, and their challenges and future trends are discussed.