Design of a novel limited angle toque motor with compound Halbach array for electric direct-drive servo system in aerospace vehicle

Aerospace vehicle is the next-generation space transportation system with horizontal take-off/Landing and reusable features. However, due to its hypersonic speed, super-maneuver and safety performance, conventional servo system can no longer satisfy the harsh requirements of high dynamic response and reliability in aerospace vehicles. In this paper, an electric direct-drive servo system is proposed based on novel limited angle torque motor to achieve fast frequency response and fault-tolerant simultaneously. For the motor, outer-rotor topology with compound Halbach array is researched to enhance output performance. In addition, multiple single-phase windings with flat wire are designed to facilitate redundancy configuration in the stator. Firstly, the structure of the novel motor and operation principle of the system is presented. Then, focusing on the topology, electromagnetic finite-element (FE) analysis and comparison are conducted to validate its output advantages. Finally, electric redundancy configuration method is demonstrated. And it is expected to provide a new solution to aerospace servo system.