Automotive double-coil internal-cooling eddy current braking device

Abstract

The invention discloses an automotive double-coil internal-cooling eddy current braking device, which is composed of a stator, a rotor, coils and a controller. The device adopts an internal water-cooling mode to directly cool the heating surface and the coils, has more stable eddy current braking performance, satisfies the demand for long-term continuous braking, and helps improve the braking force per unit volume of a retarder. By the double-coil and double-rotor structure design, the axial space can be effectively utilized within a limited outer diameter dimension, the magnetic circuit efficiency is improved, and manufacturing and assembling are easy. In addition, the hierarchical control is easy, and the control cost is low. By the internal cooling mode of the device, the influence of the casting process on magnetic efficiency is reduced, manufacturing and assembly are easy, and the cost is low. The device has a wide application range, and can be assembled at some positions such asvehicle axles, transmission shafts, gearboxes, etc. The hierarchical control is easy, and a relay low-cost control mode can be adopted.

Description

technical field [0001] The invention relates to a water-cooled electric eddy current braking device, which belongs to the field of automobile auxiliary braking. Background technique [0002] China is a mountainous country, and mountainous roads account for a considerable proportion. High speed, heavy load, long downhill and frequent braking threaten the driving safety of heavy commercial vehicles in road transportation. As an expedient measure to solve the overheating of the brakes, many drivers spray water on the brakes or cool the brakes in the special brake coolant in the highway parking lot, but frequent watering will shorten the life of the brake pads and increase the cost of use. Drenching water will cause the road surface to freeze. The auxiliary braking device can greatly reduce the number of times of stepping on the brakes, and has a significant effect on overheating of the brakes or emergency braking. It can avoid traffic accidents caused by the failure of the mai...

AI Technical Summary

Problems solved by technology

The traditional eddy current retarder adopts air cooling method to dissipate heat, which leads to excessive temperature of the retarder and serious performance degradation. After 10 minutes of continuous operation, the braking torque drops by more than 50%.

At present, most of the water-cooled eddy current retarders are set up with water channels through the stator, and the eddy current heat is taken away by using the engine coolant or its own cooling system. However, because the eddy current heat source does not contact the liquid, it is through heat conduction In this way, the temperature of the vortex surface can also reach more than 300 °C

[0004] The application number is 200520068140.9, which discloses an eddy current retarder, which uses eddy current to generate braking torque, but the temperature is high, heat dissipation is difficult, and the heat decay is serious; the application number is 201320792505.7, a double-salient liquid-cooled electric eddy current retarder , using water-cooled heat dissipation, which solves the problem of excessively high continuous braking temperature and reduces thermal decay, but the weight of the rotor is large and only has a single-coil structure; the application number is 201610383587.8, a rotor-embedded electromagnetic liquid-cooled retarder, using The embedded structure of the rotor and water-cooled heat dissipation have good heat dissipation effect and small weight of the rotor, but it only has a single coil structure; a liquid-cooled electromagnetic retarder with the application number 201711052419.1 adopts a double-coil and large magnetic circuit design, and the middle partition is not Take the magnetic circuit, but the structure of the stator water channel is complex, the cost is high, and the excitation coil does not adopt effective cooling measures

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