Flywheel energy storage device

Abstract

The invention provides a flywheel energy storage device. The flywheel energy storage device comprises a shell; a mandrel; a first radial electromagnetic bearing; a second radial electromagnetic bearing; a first protection bearing; a second protection bearing; a motor; a flywheel; and a friction limiting piece; wherein a radial gap between a stator and a rotor of the second radial electromagnetic bearing is b; the radial clearance between the inner ring of the second protection bearing and the mandrel is a, and a is less than b; the radial gap between the stator and the rotor of the motor is c, and c is greater than b; the motor comprises a wheel body and a hub, and an annular space is formed by the inner ring wall and the outer ring wall of the hub, the friction limiting piece comprises an extending part extending into the annular space, the radial gap between the extending part and the inner and outer ring walls is d, and d is smaller than b. By arranging the friction limiting piece, radial vibration displacement of the mandrel is forcibly limited, the motor rotor is protected against friction with the motor stator, the bearing rotor of the radial electromagnetic bearing is protected against friction with the bearing stator in cooperation with the protection bearing, and the electromagnetic bearing and the motor are better protected; and the use safety and the service life of the flywheel energy storage device are ensured.

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 high speed, and then uses the flywheel to drive the generator to generate electricity when needed. Flywheel energy storage devices usually use magnetic suspension bearings (magnetic bearings for short) to reduce friction when the motor rotor rotates. In order to protect the magnetic suspension bearings, flywheel energy storage devices usually include protective bearings. The protective bearings are when the support of the magnetic bearings does not work or due to In the case of failure for some reason, the mechanical boundary where the stator and rotor touch, this is an additional set of passive bearings, and precision angular contact ball bearings, deep groove ball bearings, etc. are usu...

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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