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This paper presents a novel gearless and brushless power split transmission system for variable-speed constant-frequency wind power generation application. The core element of this system is a novel axial-flux doubly fed dual-rotor permanent magnet machine. The key of the design is to utilize the flux modulation principle to modulate the magnetic flux in an axial-flux machine and use doubly fed stator winding to control the rotor rotation. This design combines the merits of direct-drive machines and doubly fed generators. As the mechanical problems related to brushes, slip rings, and gear boxes are successfully overcome, the operational reliability of the system is improved. The stator winding of the proposed system can be directly connected to the power grid, and the power rating of its associated frequency converter is reduced. Time-stepping finite-element method is used to analyze the dynamic performance of the proposed system. [ABSTRACT FROM AUTHOR]

A novel electrical continuously variable transmission (E-CVT) system for hybrid electric vehicles is presented. The merits of the system, which is comprised of a magnetic gear (MG) integrated permanent magnet brushless machine, are its compactness, light weight, very high torque density, and simple structure. The integrated MG is ingeniously used to greatly amplify its output torque. It serves the functions of both power splitting and coupling. The drawbacks of mechanical gears or brushes in traditional systems are overcome. A design method based on finite element method for maximizing the torque output of the machine is presented and the performance of the machine in the E-CVT system is validated. [ABSTRACT FROM AUTHOR]