A flywheel energy storage device

Abstract

The invention provides a flywheel energy storage device, comprising: a casing; a mandrel; a first radial electromagnetic bearing; a second radial electromagnetic bearing, wherein the radial gap between the stator and the rotor of the radial electromagnetic bearing is b; The first protection bearing; the second protection bearing, the radial clearance between the inner ring of the protection bearing and the mandrel is a, a<b; the radial clearance between the motor, the motor stator and the rotor is c, c>b; the flywheel, including the wheel The body and the hub, the inner ring wall and the outer ring wall of the hub form an annular space; the friction limiter includes a protruding part extending into the annular space, and the radial gap between the protruding part and the inner and outer ring walls is d, d <b. By setting the friction limiter, the invention forcibly limits the radial vibration displacement of the mandrel, protects the motor rotor from friction with the motor stator, and cooperates to protect the bearing to protect the bearing rotor of the radial electromagnetic bearing from friction with the bearing stator. Protect the electromagnetic bearing and motor, and ensure the safety and service life of the flywheel energy storage device.

Description

technical field [0001] The invention relates to the technical field of flywheel energy storage, in particular to a flywheel energy storage device. Background technique [0002] Flywheel energy storage refers to the energy storage method that uses the motor to drive the flywheel to rotate at a high speed, and then uses the flywheel to drive the generator to generate electricity when needed. The flywheel energy storage device usually uses a magnetic suspension bearing (magnetic bearing for short) to reduce the friction when the motor rotor rotates. In order to protect the magnetic suspension bearing, the flywheel energy storage device usually also includes a protection bearing. In the event of failure for some reason, the mechanical boundary between the stator and the rotor touches. This is a set of additional passive bearings. Usually, precision angular contact ball bearings, deep groove ball bearings, etc. are used. When the magnetic bearing equipment operating under rated ...

AI Technical Summary

Problems solved by technology

[0004] In order to achieve high power and high energy storage for the flywheel energy storage device, it is necessary to increase the axial length of the flywheel motor rotor to form a long mandrel shaft structure. When the shafting of the flywheel motor passes through the resonance zone, the large radial vibration displacement may exceed the air gap between the stator and rotor of the motor and the stator and rotor of the electromagnetic bearing, resulting in rubbing of the motor and the electromagnetic bearing, which cannot guarantee the safety and service life of the flywheel energy storage device

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