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An appropriate torque-angle selection can improve the torque-to-current ratio of a machine, the size of the converter, and provide an optimal operation of the motor. An accurate determination of the core loss will lead to a better machine design and efficiency estimation. This paper presents the torque-angle and core loss characterization of a variable-flux permanent-magnet machine. Torque-angle curves...
In order to improve the performance of the wound field synchronous motor (WFSM), the permanent magnet assist (PM-assist) is investigated in this paper. The effect of the permanent magnet assist is dependent on the inserted position of the permanent magnets. Thus, four models whose permanent magnets are inserted at each different positions are suggested. Then, the most effective position of the permanent...
Recently, significant attention has been paid to the use of ferrite magnets in the main traction machines of electric vehicles/hybrid electric vehicles (EVs/HEVs). However, while ferrite magnets are advantageous in terms of cost, they provide poor magnetic performance in comparison to the neodymium (NdFeB) magnets used in high-performance, high-efficiency machines with high torque densities. To overcome...
The future trend of mechanical systems is to substitute most of them by Permanent Magnet (PM) and/or Electromagnetic based ones. This paper presents an extension research on Design, Modeling, Simulation and Implementation Based Control of a novel ROTLIN (Rotary-Linear) Radial Gap Helical Machine. This is an hybrid of Magnetic Screw with a Synchronous Motor by modifying the design concept. The implemented...
This paper presents a triple-rotor axial-flux spoke-array vernier permanent magnet (TR-AFSAVPM) machine to enhance the performance of vernier machines. By cooperating spoke-array rotor and coil-wounded winding, power factor and torque density of the proposed machines are much improved and their copper utilization is reduced as well comparing with conventional vernier machines. Firstly, the machine...
This paper investigates the performance of three magnetic materials: silicon iron, soft magnetic composite and amorphous magnetic material, as the stator of an axial-flux permanent-magnet machine. Three stators, one of each material, are built and tested with the same rotor. The losses of each of the machines are separated using a combination of 3D finite-element analysis and experimental testing...
In recent years, interior permanent magnet synchronous motors (IPMSMs) using ferrite permanent magnet are being studied for high power density motor application, such as electric vehicles. However, the residual flux density of ferrite magnet is lower than that of rare-earth permanent magnet. Thus, in general, it is difficult for IPMSMs using ferrite magnet to maintain constant high output power in...
This paper presents the design considerations of a double-sided transverse flux machine (TFM) for direct-drive wind turbine applications. The TFM has a modular structure with quasi-U stator cores and ring windings. The rotor is constructed with ferrite magnets in a flux-concentrating arrangement to achieve high air gap flux density. The design considerations for this TFM with respect to initial sizing,...
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