Design and Control of A New Bearingless Motor for Flywheel Energy Storage

Fan Yang

School of Electrical and Information Engineering, Jiangsu University, Zhenjiang, China

Abstract: Flywheel energy storage is a new energy storage technology. The existing technology is mainly based on ordinary high-speed motor as the main driving force lead to flywheel energy storage system is inefficient and can’t reach the ideal energy conversion efficiency. The new type of 12 slot 8-pole high speed motor is designed based on the structure of a new flywheel energy storage device. It is added suspension winding to the outer rotor brushless DC motor to make it a bearingless motor. Firstly, the structure and size of the motor are described in detail. Secondly, the principle of the motor is introduced in detail and the mathematical model of the motor is derived. Thirdly, the finite element tool is used to simulate the design of the motor. Finally, The simulation system is built using the obtained mathematical model. The simulation of two different states of electric motor and electric generator is carried out. The experimental results show that the parameters of the motor meet the design objectives. It can be used in flywheel energy storage structure and make it more efficient.

Keywords: Flywheel energy storage; Bearingless; Brushless DC motor