Permanent magnet electromagnetic composite disc type eddy current braking device

Abstract

Provided is a permanent magnet electromagnetic composite disc type eddy current braking device. The device comprises two magnet discs, a metal disc, and a transmission shaft, the two magnet discs are fixed on static equipment in parallel, the metal disc is fixed on the transmission shaft and arranged between the two magnet discs in parallel, the metal disc and the two magnet discs are also coaxially installed, the transmission shaft is supported on the two magnet discs via bearings, each magnet disc is provided with m composite magnetic poles formed by permanent magnets and electromagnets along the circumference (m is an even number), the m composite magnetic poles on the two magnet discs are opposite in pairs in the axis direction, and the magnetic field at the position of the metal disc between the two magnet discs is changed via the adjustment of the current and direction of electromagnet coils. When the metal disc and the magnet discs generate relative movement, eddy current is generated in the metal disc, interaction is generated, and rapid braking between the metal disc and the transmission shaft and moving bodies connected with the metal disc is realized. The braking device is applicable to rapid braking of high-speed moving bodies.

Description

technical field [0001] The invention relates to a permanent magnet electromagnetic composite disc eddy current braking device for braking a high-speed moving body. Background technique [0002] The braking devices of high-speed moving bodies such as motor vehicles and motor acceleration mechanisms often use brake pads to contact the brake disc to generate friction, thereby generating braking, that is, mechanical friction braking. However, in the case of high-speed movement, if mechanical friction braking is used, it will cause problems such as mechanical wear of wheels or brake discs and other components, noise friction and thermal stress, and the maintenance workload will also increase greatly. At present, the problem of friction braking is solved The measures mainly include improving the contact surface material and contact mode, but they cannot completely overcome the defects caused by mechanical friction braking. [0003] Magnetic eddy current braking can achieve brakin...

AI Technical Summary

Problems solved by technology

However, the current problem is that the output braking torque of the permanent magnet eddy current brake device cannot be adjusted, which limits the applicability of the permanent magnet eddy current brake device

However, the output torque of this adjustable-speed disc-type magnetic coupling is limited, and the permanent magnet disc needs to be in a moving state for a long time, which has high requirements for the installation reliability of the mechanical device

[0007] The Chinese patent of CN102270911A discloses a magnetic coupler in which the permanent magnet in the magnetic rotor is fan-shaped, the braking source is a permanent magnet, and the magnetic force is not adjustable

The retarder achieves the purpose of decelerating the vehicle when the speed is too fast, but if the electromagnet control fails, the braking effect will be completely lost

[0009] Summing up the above prior art, it can be known that the amount of permanent magnet used for permanent magnet linear braking is large. For example, when the permanent magnet used for braking is laid on the track, the permanent magnet utilization rate is very low, the volume is large, and the quality is heavy, which easily deforms the track. , leading to changes in parameters such as clearances that affect braking performance

The existing speed-adjustable magnetic coupling of the rotating structure adopts a disc-shaped structure, which is compact in structure and reduces the space occupied by the braking device, but the braking power is not adjustable

The permanent magnet electromagnetic compound brake can adjust the output power, but the output torque is limited

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