Ultrathin vehicle-mounted magnetic suspension flywheel battery and working method thereof

Abstract

The invention discloses an ultrathin vehicle-mounted magnetic suspension flywheel battery for an electric vehicle, and a working method thereof. A motor bracket, an axial magnetic flux motor, a flywheel, an inner stator of a five-degree-of-freedom magnetic bearing, a coil and a permanent magnet are coaxially arranged in a shell from top to bottom, and the flywheel consists of an upper layer, a middle layer and a lower layer which are continuous; an upper annular groove is formed in the middle of the upper annular layer of the upper flywheel, the axial flux motor is placed in the upper annular groove, and an annular inner groove, a middle annular cavity and a lower annular groove are communicated and jointly used for placing the inner stator, the coil and the permanent magnet of the five-degree-of-freedom magnetic bearing; and the five-degree-of-freedom magnetic bearing comprises an axial magnetic bearing, a repulsion magnetic bearing, a torsion magnetic bearing and a radial spherical magnetic bearing from inside to outside. The mode that magnetic bearings with different properties are reused is adopted, advantage complementation is achieved, the bearing capacity and control precision of magnetic bearing supporting can be improved, the stability of a flywheel is remarkably improved, and the problem that the loss of a control coil is large due to complex working conditions can be effectively solved.

Description

technical field [0001] The invention relates to a flywheel battery, also called a flywheel energy storage device, in particular to a five-degree-of-freedom magnetic levitation flywheel battery for electric vehicles. Background technique [0002] Flywheel battery is a new concept energy storage device. It breaks through the limitations of chemical batteries and realizes physical energy storage through high-speed rotation of flywheel. It has the characteristics of no pollution, high energy conversion efficiency and power density, long cycle life, and insensitivity to temperature. , is a power battery with great development potential in the field of new energy vehicles. However, the current practical application and popularization of vehicle-mounted magnetic levitation flywheel batteries are mainly hindered by occupying a large axial space and facing complex vehicle driving conditions and road conditions (that is, changes in vehicle driving conditions and road conditions, etc.)...

AI Technical Summary

Problems solved by technology

[0007] In terms of flywheel load-bearing mode: At present, the electromagnetic attraction in the opposite direction to the flywheel's gravity is generally used to balance the gravity, but there are the following problems: for example, when the flywheel is disturbed and shifted downward, the air gap increases, the air gap magnetic flux decreases, and the electromagnetic force decreases. If the flywheel is small, the offset of the flywheel will be aggravated. If the element of "repulsion" is added to the entire flywheel battery system, the clever placement of permanent magnets can be used to realize the anti-disturbance of the flywheel in small working conditions, and the repulsion force can be used to make the magnetic bearing realize self-balancing , reducing the loss caused by the control coil

[0008] In terms of safety: the safety cover of the flywheel battery system usually has the function of sealing and safety precautions, while the current flywheel batteries usually use rigid plate and mesh protective shells, which often resist high-speed composite material flywheels or heavy metal flywheels, resulting in insufficient safety , and this kind of casing has high quality, insufficient safety and poor sound insulation effect, which limits its application and promotion

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