Out rotor bearingless brushless DC motor for flywheel energy storage

Flywheel energy storage system 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 of flywheel energy storage device is introduced. Secondly, the structure and size of the motor are described in detail. Thirdly, the principle of the motor is explained and the mathematical model of the motor is derived. Finally, the designed motor is simulated with finite element software. Then the simulation results are analyzed. The simulation 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.