Large energy storage variable-section rotor flywheel energy storage system supported by permanent magnet bearing and electromagnetic bearing

Abstract

The present invention discloses a large energy storage variable-section rotor flywheel energy storage system supported by the permanent magnet bearing and the electromagnetic bearing, belongs to the technical field of flywheel energy storage, and solves the problems that the axial length of the flywheel rotor existing in the existing flywheel energy storage system affects the dynamic mechanical characteristics of the rotor and leads to the poor compactness of the structure of the flywheel energy storage system. The permanent magnet thrust bearing, the upper auxiliary bearing, the outer rotor permanent magnet synchronous motor and the lower auxiliary bearing are mounted on the mandrel, and the upper end and the lower end of the flywheel rotating body are in a clearance fit state with the upper auxiliary bearing and the lower auxiliary bearing; there is a gap between the permanent magnet thrust bearing and the upper end surface of the flywheel rotating body; the outer rotor permanent magnet synchronous motor is arranged in the flywheel rotating body to drive the flywheel rotating body to rotate; and the radial electromagnetic bearing is fixedly mounted on the shell, the electromagnetic bearing is in non-contact with the outer wall of the flywheel rotating body, and the flywheel main body is a stepped variable cross-section structure with a slope. According to the rotor system provided by the present invention, the structure is compact, and the dynamic characteristics of the rotor are enhanced.

Description

technical field [0001] The invention relates to a flywheel energy storage system, in particular to a flywheel energy storage system with a large energy storage and variable cross-section rotor supported by a mixture of permanent magnetic bearings and electromagnetic bearings, and 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 mec...

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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