Optimum Design Approach for Low Speed, High Torque Permanent Magnet Motors

Fractional Slot Permanent Magnet Synchronous Motors for Low Speed Applications

Pulsating Torque Reduction for Permanent Magnet AC Motors

Control methods for pulsation of torque reduction for the surface-mounted permanent magnet motors are discussed in the paper. The pulsation torque is a consequence of the non-sinusoidal flux distribution and due to interaction of the rotor’s permanent magnets with the changing stator reluctance. Proposed control method is estimator based. To assure parameter convergence Lyapunov’s direct method...

A Low-Speed, High-Torque, Direct-Drive Permanent Magnet Generator For Wind lhrbines

There is a market for small, efficient and costeffective wind generators for mini-grid and remote power systems. Direct-drive permanent magnet generators have become very attractive for this application. This paper describes the improvements achieved in an outer-rotor direct-drive permanent magnet generator by using finite element analysis and optimisation techniques. The starting torque of the...

Design Study of Low-speed Direct-driven Permanent-magnet Motors with Concentrated Windings

In this study, different designs of radial-flux direct-driven permanent magnet (PM) motors are compared. They should replace an induction motor and its gearbox for an industrial application requiring 5 kW and 50 rpm. The goal is to show if the use of concentrated windings brings some benefits for this application, the PM motors having a high number of poles. Different combinations of the number...

Novel Torque Control Technique for High Efficiency/High Power Interior Permanent Magnet Synchronous Motors

HV The motors of hybrid electric vehicles must be able to offer high efficiency, a high power/weight ratio, and excellent reliability across the entire rotor speed range. Interior permanent magnet synchronous (IPM) motors are used to satisfy these requirements. The goal of this study was to develop an IPM motor control method that would increase the torque and the efficiency at high and medium ...