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A Novel Slotless Halbach-Array Permanent-Magnet Brushless DC Motor for Spacecraft Applications

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6 Author(s)
R. P. Praveen ; Cochin University of Science and Technology, Coachin, Kerala, India ; M. H. Ravichandran ; V. T. Sadasivan Achari ; V. P. Jagathy Raj
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This paper presents the design and analysis of a novel machine family-the enclosed-rotor Halbach-array permanent-magnet brushless dc motors for spacecraft applications. The initial design, selection of major parameters, and air-gap magnetic flux density are estimated using the analytical model of the machine. The proportion of the Halbach array in the machine is optimized using finite element analysis to obtain a near-trapezoidal flux pattern. The machine is found to provide uniform air-gap flux density along the radius, thus avoiding circulating currents in stator conductors and thereby reducing torque ripple. Furthermore, the design is validated with experimental results on a fabricated machine and is found to suit the design requirements of critical spacecraft applications.

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IEEE Transactions on Industrial Electronics  (Volume:59 ,  Issue: 9 )