Design and Performance Analysis of Quadruple Winding Redundancy Brushless DC Torque Motor

摘要

This paper presents the design and performance analysis of frameless quadruple redundancy permanent magnet brushless dc torque motor. A novel method is adopted in stator assembly to isolate all four quadrant windings physically such that each quadrant behaves as a separate motor in a single stack leading to quadruple redundancy. Fractional slot stator assembly and permanent magnet rotor assembly conforming to the stator quadruple redundancy is designed. The volume of the stator assembly and rotor assembly are apportioned from the given overall envelope dimensions. The electrical loading and magnetic loading are worked out analytically for the desired torque and speed output. Preliminary designed motor is modeled in finite element based electromagnetic software for flux density analysis in the air gap, magnetic core and magnet return ring. Based on the magnetic analysis result proto type motor is fabricated and tested for performance comparison of all four quadrants.