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This paper proposes an advanced spoke type permanent magnet (PM) servo motor with high torque density. The optimizations of split ratio and trapezoidal magnet dimensions are performed, and unequal airgap is employed to reduce the cogging torque. The designed trapezoidal magnets are used in one 3 Nm prototype to remove the rotor iron bridge, which introduces heavy leakage flux especially for the brushless...
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...
Totally enclosed water-cooled permanent magnet machines have been widely applied in electric vehicles due to their advantages of high torque density, high power factor, and strong overloading capacity. However, this type of machine often suffers from extremely high ambient temperature in a very limited space, which may lead to serious faults during operation, such as demagnetization. In order to study...
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