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A compact flywheel energy storage system assisted by axial-flux partially-self-bearing permanent magnet motor has been proposed by the authors. The proposed machine combines axial magnetic bearing and motoring functionality into a single magnetic actuator, which not only spins the rotor-flywheel but also generates a levitation force to overcome the gravity. The mathematical model of the levitation...
A novel high speed flywheel energy storage system is presented in this paper. The rated power, maximum speed and energy stored are 4 kW, 60,000 rpm and 300 Whr respectively. High power density, energy density and efficiency can be obtained in this system with the compact design. In this design, the rotor with composite rim acts as the flywheel of the system and is sandwiched between two disk type...
A flywheel cell intended for multi-flywheel cell based energy storage system is proposed. The flywheel can operate at very high speed in magnetic levitation under the supports of the integrated active magnetic bearing and a passive magnetic bearing set. 3D finite element analyses were applied to verify various configurations of passive magnetic bearing. The feasibility of PID controllers for the flywheel...
A compact and efficient flywheel energy storage system is proposed in this paper. The system is assisted by integrated mechanical and magnetic bearings, the flywheel acts as the rotor of the drive system and is sandwiched between two disk type stators to save space. The combined use of active magnetic bearings, mechanical bearings and axial flux PM synchronous machine assists the rotor-flywheel to...
There is demand for high-speed but light-weight flywheel system for energy and momentum storage. The applications range from replacements for batteries, uninterruptible power supplies and even in space satellites. This paper proposes a new design of a mechanically contactless flywheel system which should be both compact and energy efficient. The flywheel acts as the rotor of the drive system and is...
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