Tumbler type vehicle-mounted flywheel energy storage device with five-degree-of-freedom suspension support

Abstract

The invention discloses a tumbler type vehicle-mounted flywheel energy storage device for five-degree-of-freedom suspension support of an electric automobile. A flywheel is in a bowl shape formed by interference fit of a metal flywheel rotor and a composite material ring, the metal flywheel rotor is composed of an upper section ring, a middle section hollow hemisphere and a lower section ring, the composite material ring tightly sleeves the upper section ring to form a bowl-shaped bowl opening part, the inner wall of the bottom end of the upper section ring protrudes inwards in the radial direction to form a ring-shaped axial thrust disc, the upper region of the axial thrust disc is a bowl opening empty groove layer, and the lower region of the axial thrust disc is sequentially provided with a spherical empty groove layer and a bowl bottom empty groove layer to form a flywheel inner cavity, a supporting frame is sleeved in an inner stator, a bowl foot ring cavity is formed betweenthe lower section ring and a bowl foot central shaft in the middle of the lower section ring, and a driving motor is accommodated in the bowl foot ring cavity. A magnetic bearing and the motor are arranged in the flywheel, the axial length of the device is effectively reduced, the integration level is improved, the flywheel is in a shape with the light upper portion and the heavy lower portion, the gravity center is concentrated at the bowl bottom, and natural self-balance is achieved.

Description

technical field [0001] The invention relates to the field of a vehicle-mounted flywheel energy storage device (also called a flywheel battery) for an electric vehicle, in particular to a vehicle-mounted energy storage device with a five-degree-of-freedom suspension support. Background technique [0002] As a green energy storage device developed in recent years, the flywheel energy storage device has the advantages of high specific power, high charge and discharge efficiency, low noise pollution and long life cycle. It is one of the ideal power batteries for electric vehicles. However, the main challenges currently restricting the development of flywheel energy storage devices for electric vehicles are technical problems such as large space occupation, unreliable performance, high cost, difficulty in ensuring safety performance, and complex control methods. [0003] In terms of space arrangement: the topology of the traditional flywheel energy storage device is generally arr...

AI Technical Summary

Problems solved by technology

However, although the topology design scheme of this device uses the idea of ​​"embedding" to reduce the axial volume of the flywheel energy storage device and has a high degree of integration, the embedded part of the magnetic bearing not only makes the processing of the flywheel rotor difficult and the maintenance cost is high. More importantly, it will lead to stress concentration in the embedded part of the flywheel, so the energy storage characteristics and safety characteristics cannot be guaranteed

Furthermore, the metal flywheel in the device is designed in the form of a cylindrical disc, which has low system economy and poor self-stabilization effect under the condition of achieving a specific energy storage. Has a stronger gyroscopic effect, which in turn increases the difficulty of its control

In addition, in order to offset the weight of the flywheel, the axial magnetic bearing of the device adopts a double permanent magnet ring structure, which will inevitably generate magnetic flux leakage and increase the energy consumption of the system, and there is no magnetic circuit coupling between the entire five-degree-of-freedom magnetic bearings. The magnetic isolation aluminum ring replaces the air gap magnetic barrier. Although it can achieve the desired effect, it will increase the eddy current loss of the system at the same time.

Images