Low-loss flywheel energy storage device

Abstract

The invention discloses a low-loss flywheel energy storage device which comprises a cylindrical vacuum shell. A stator winding, a permanent magnet rotor and a flywheel are fixedly connected in the shell, the permanent magnet rotor and the flywheel are fixedly connected together and rotate at high speed around the axis of the shell, and the flywheel is placed on a wear resisting ceramic ball or a wear resisting ceramic column based on the gyro principle. The defects that a motor bearing fixing mode is large in energy conversion loss, large in frictional heating, short in service life of a bearing and low in energy storage density are overcome, and meanwhile the defects that due to the fact that a magnetic floating bearing technology is adopted, the device is too complex, manufacturing cost is high, and popularization is hard are overcome. The device is novel in structure, safe, reliable and low in cost and has quite wide application prospect.

Description

technical field [0001] The invention belongs to an energy conversion device, in particular to a novel structure low-loss flywheel energy storage device. Background technique [0002] In recent years, with the rapid development of new energy electric vehicles, etc., the application of electric energy storage devices has become increasingly widespread. Among many electrical energy storage devices, flywheel energy storage devices are attracting more and more attention because of their good dynamic performance and no secondary pollution. The basic principle of flywheel energy storage is that first, the electric motor runs through the current to drive the flywheel to rotate at high speed, and the electric energy is converted into kinetic energy and stored on the rotor flywheel. When necessary, the flywheel drives the motor to run as a generator, and the kinetic energy in the flywheel is converted into electrical energy. [0003] Since the kinetic energy stored in the rotor flyw...

AI Technical Summary

Problems solved by technology

[0004] One way of fixing the flywheel in the existing flywheel energy storage device is through bearings. The disadvantages of this fixing way are large energy conversion loss, high friction and heat generation of bearings, short bearing life, and low energy storage density, resulting in high cost. , so that its wide-range application is limited; another way to fix the flywheel is to use the magnetic suspension bearing technology to make the flywheel in a suspended friction-free state, which can allow the maximum speed of the flywheel to increase by ten times or more, greatly improving the storage capacity of the flywheel. Energy density, not only has a long life, but also reduces the loss a lot, but the disadvantage of this fixing method is that the device is too complicated, the device is expensive, the stability is poor, and the wide-range application is also limited

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