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Analysis, Optimization, and Prototyping of a Brushless DC Limited-Angle Torque-Motor With Segmented Rotor Pole Tip Structure

This paper presents the analysis and design of a two-pole dc brushless limited-angle torque-motor (LATM) with a toroidally wound armature using magnetic equivalent circuit modeling. A variety of design concepts is considered based on several defined criteria, and then, the most worthy alternative is chosen. To select the best design concept, an efficient decision-making tool called analytical hierarchy process is employed. A new segmented rotor pole tip structure of the LATM is introduced. The results obtained from finite-element simulation of the proposed machine conform well with the analysis. The selected design is prototyped, and the experimental results are presented.