Jagathy Raj, V P; Praveen, R P; Ravichandran, M H; Sadasivan Achari, V T; Madhu, G; Bindu, G R(IEEE, September , 2012)
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Abstract:
This paper presents the design and analysis of a novel
machine family—the enclosed-rotor Halbach-array permanentmagnet
brushless dcmotors 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
Description:
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, VOL. 59, NO. 9, SEPTEMBER 2012