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8. Design and FEM Analysis of a High Efficiency Axial-Flux Brushless DC Motor for Flywheel System

Author

Chi Zhang and Guang Zhou Zhao

Subjects
Engineering, Rotor (electric), business.industry, Mechanical Engineering, Mechanical engineering, Magnetic bearing, Degrees of freedom (mechanics), DC motor, Finite element method, Flywheel, law.invention, Mechanics of Materials, law, Control theory, visual_art, Levitation, visual_art.visual_art_medium, General Materials Science, Ceramic, business
Abstract

A high efficiency axial-flux brushless DC motor assisted by self axial magnetic bearing and used in flywheel energy storage system is proposed in this paper. In this design, the rotor with composite rim acts as the flywheel of the system and is sandwiched between two disk type stators which are made of amorphous metal to reduce iron losses. The dual-stator machine combines the functions of axial flux brushless DC motor and axial magnetic bearing to rotate the flywheel-rotor and levitate it in vertical orientation. The other four degrees of freedom in radial directions are constrained by ceramic ball bearings for simple operation, high efficiency and long life span. Optimized design approaches are employed to achieve low losses, and high power density. Three-dimensional FEM analyses are implemented, and the analysis results support the feasibility of the proposed motor.

Published
2011

25. Design of MMFCS for MAV Based on MEMS Sensor

Author

Wei, Xiong, Zhou, Zhao Ying, and Liu, Xiao Yan

Abstract

Micro Measurement and Flight Control System (MMFCS) is important for an autonomous Micro Aerial Vehicle (MAV) to accomplish a flight task. Being in small size, low speed and limited payload capacity, most conventional measurement and control system is no longer practical in Micro Aerial Vehicle (MAV). In this paper presents a study on micro-MMFCS system based on criteria of minimum size and low computational complexity to complete the autonomous fly. Via using MEMS sensors, the developed micro MMFCS is with a size of 65×40×12mm3 and a weight of 22g. A novel linear fusion algorithm with a linear (and simple) Kalman model is presented to get the roll and pitch angle, then, the controller is designed in the lateral and longitudinal control loop for the trajectory tracking. Examples of waypoint-based autonomous fly mission, using the micro-MMFCS system of a MAV with a wingspan of 380 mm, is presented, with the results demonstrate the effectiveness of the proposed system.

Published
2011
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