Flywheel energy storage system of vertical-type outer-rotor electromagnetic bearing

Abstract

A flywheel energy storage system of a vertical-type outer-rotor electromagnetic bearing belongs to the technical field of flywheel energy storage. By the flywheel energy storage system, the problem ofinfluence on dynamic property of a rotor to cause poor compactness of the flywheel energy storage system due to axial length of a flywheel rotor of an existing flywheel energy storage system is solved. A permanent-magnet thrust bearing, an upper auxiliary bearing, an upper radial electromagnetic bearing, an outer-rotor permanent-magnet synchronous motor, a lower radial electromagnetic bearing anda lower auxiliary bearing are sequentially arranged on a core shaft from top to bottom, the upper radial electromagnetic bearing, the lower radial electromagnetic bearing and an inner wall of a flywheel rotation body are in a non-contact state, an upper end and a lower end of the flywheel rotation body are in clearance fit with the upper auxiliary bearing and the lower auxiliary bearing, the permanent-magnet thrust bearing is arranged above the flywheel rotation body, a gap is reserved between the permanent-magnet thrust bearing and an upper end surface of the flywheel rotation body, and theouter-rotor permanent-magnet synchronous motor is arranged in the flywheel rotation body and drives the flywheel rotation body to rotate. The rotor system is compact in structure, and the dynamic property of the rotor is improved.

Description

technical field [0001] The invention relates to a flywheel energy storage system, in particular to a flywheel energy storage system with a vertical outer rotor electromagnetic bearing, which belongs to the technical field of flywheel energy storage. Background technique [0002] As a flexible and adjustable active power source, the flywheel energy storage system actively participates in the dynamic behavior of the system, and can shorten the transient transition process after the disturbance is eliminated, so that the system can quickly return to a stable state. The flywheel energy storage system is mainly composed of flywheel rotors, bearings, integrated electric / power generation reciprocal bidirectional motors, electronic power converters, etc. The integrated electric / power generation reciprocal bidirectional motor realizes the conversion of electric energy and high-speed flywheel mechanical energy. The electric energy drives the motor through the power converter, and the...

AI Technical Summary

Problems solved by technology

If the flywheel energy storage system is installed with an inner rotor motor and supported by multiple magnetic suspension bearings, the axial length of the flywheel rotor will usually be increased, which will affect the dynamic characteristics of the rotor and lead to poor compactness of the flywheel energy storage system

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