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In many direct-drive applications such as servo system, wind power generation, etc., it is desirable to use motors having a high torque density at a low rotation speed without reduction gears for the improvement of noises, reliability and maintenance.
Permanent-magnet motors with rare-earth magnets are among the best candidates for high-performance applications such as automotive applications. However, due to their cost and risks relating to the security of supply, alternative solutions such as ferrite magnets have recently become popular. In this paper, the two major design challenges of using ferrite magnets for a high-torque-density and high-speed...
The torque ripple of arc permanent magnet synchronous motors (PMSMs) is significant for the positioning precision and tracking accuracy of the large telescope. In this digest, an arc vernier PMSM is proposed, which fully utilizes the advantage of vernier machine with low torque ripple and high torque density. The stator length and the relative positions of different stators are optimized to reduce...
Two main drawbacks of flux reversal machines (FRMs) are high cogging torque and low power factor, among which the latter one has not been addressed. This paper proposes an analytical method based on winding function theory to analyze the power factor of a FRM. Firstly, the back-EMF, synchronous inductance and power factor of a FRM are derived. With the employment of the equations, the main reason...
Interior permanent magnet motors with ferrite magnets and distributed windings can be a cost effective alternative to rare-earth magnet based motors for demanding applications such as automotive traction. Among different rotor topologies, the spoke type may be preferred, due to its advantages for high flux concentration and resistance to demagnetization, when carefully designed. When high speed operation...
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