Electromagnetic Performance Analysis of Homopolar Inductor Alternator with Radial Externally Movable Permanent Magnets

This article proposes a homopolar inductor alternator with a permanent magnet that can move radially outward. The motor has lower no-load electromagnetic losses under idle operating conditions, which can effectively increase the efficiency of the flywheel energy storage system. This article introduces the structure of this motor and analyzes the operating principle of this motor. As the distance between permanent magnet and motor stator is different, the magnetic field strength in the main magnetic circuit of motor is different, and the magnetic field of motor can be adjusted by adjusting the radial displacement of permanent magnet. Finally, the theoretical calculation results were verified using finite element simulation. The simulation results show that the proposed mechanical magnetic induction motor has very low no-load iron loss under idle operating conditions.