Flywheel battery supported and driven by split magnetic levitation switch reluctance motor

Abstract

The invention discloses a flywheel battery supported and driven by a split magnetic levitation switch reluctance motor. The flywheel battery comprises an enclosure and a vacuum cavity, wherein an axial permanent magnet bearing, two radial permanent magnet bearings, a motor A, a flywheel rotation shaft, a flywheel rotor, a motor B and an axial electromagnetic bearing are contained in the vacuum cavity; the flywheel rotor is fixedly sleeved at the axial center of the flywheel rotation shaft; the axial permanent magnet bearing and the axial electromagnetic bearing are arranged at the upper and lower ends of the flywheel rotation shaft respectively; the two radial permanent magnet bearings are located below the axial permanent magnet bearing and above the axial electromagnetic bearing respectively; the motor A and the motor B are arranged between the two radial permanent magnet bearings and the flywheel rotor respectively; a torque winding of the motor A and a torque winding of the motor B are connected in series, and the levitation windings are independently wound; the axial electromagnetic bearing provides controllable levitation with axial degree of freedom; the levitation winding is excited to generate radial levitation force; and the radial levitation force and the radial restoring force of the radial permanent magnet bearing provide controllable levitation with more than 4 radial degrees of freedom, thereby improving the energy storing efficiency.

Description

technical field [0001] The invention relates to the field of a flywheel battery (also called a flywheel energy storage device), in particular to a flywheel battery supported and driven by a split-type magnetic levitation switched reluctance motor. Background technique [0002] Among many energy storage devices, flywheel batteries break through the limitations of chemical batteries and use physical methods to store energy. When the flywheel rotates at a certain angular velocity, it has a certain kinetic energy, and the flywheel battery converts the kinetic energy into electrical energy. Flywheel batteries are expected to become the most promising energy storage batteries due to their outstanding advantages such as large energy storage, strong power, high efficiency, long life, fast charging and discharging, and clean and pollution-free. [0003] The working principle of the flywheel battery is: there is a motor in the flywheel battery, and the motor operates in the form of a...

AI Technical Summary

Problems solved by technology

[0004] Due to the permanent magnets on the rotor of the permanent magnet motor and the windings on the rotor of the asynchronous motor, the motor has a large no-load loss and low reliability under high-speed operation. Therefore, the increase of the critical speed of the flywheel battery and the increase of the energy storage capacity are limited.

In the flywheel battery of the prior art, the flywheel rotor, hybrid magnetic bearing and motor are installed on the rotating shaft as independent individuals, and the hybrid magnetic bearing needs to provide a suspension support with 5 degrees of freedom controllable for the flywheel battery. Therefore, the volume of the flywheel battery Large size, high cost, high energy consumption, and complex structure limit the improvement of the energy storage density and energy storage efficiency of flywheel batteries

Images