Design and Analysis of a Flywheel Supported by Hybrid Magnetic Bearing

In this study, a design structure of a new flywheel supported by Hybrid Magnetic Bearing (HMB) with permanent magnet in rotor is modeled using 3D Software solid works. The hybrid magnetic bearing consists of two sets of Active Magnetic Bearing (AMB) and a set of Permanent Magnetic Bearing (PMB) as well as a frequency response analysis for a rotor dynamic system at a rotor speed of 20,000 rpm. In this system an axial PMB is located at the top of the rotor to provide a levitation force in order to suspend more flywheel weight, two radial and axial AMB are added to provide support in the radial and axial directions to improve stiffness by two orders of magnitude from 104 N/M to 106N/M and the damping of the flywheel energy storage system (FESS). The prototype HMB model flywheel structure presented in Fig. 6 with a storage capacity of 4 KW rotating at a speed of 20000 rpm has an advantage of simplicity in structure, high energy density, low frictional and internal energy losses, ultimately resulting in higher power output. A unique feature of this design is that the upper and the lower ends of the rotor and the stator core have been tapered compared to previous design ensuring that larger thrust and lower radial force are obtained.