Magnetic circuit of electromagnet of vehicle electromagnetic brake

Abstract

This invention relates to one automobile technique field ad relates to automobile brake functional parts electromagnetic circuit shape suitable for automobile braking. The invention is characterized by the following: the ellipse long axis non-symmetric magnetic path designed as B-H curve linear section and opens tank at the inside magnetic path with depth as 2 to 3 mm and width as 2 to 2.5 mm distributed evenly on the magnetic path. The invention has the following advantages: inside absorptive force is larger than outside speed to setoff friction by speed.

Description

technical field [0001] The invention relates to the technical field of vehicles, in particular to a magnetic circuit shape of an electromagnet of a functional part of a vehicle brake, and the brake is especially suitable for braking trailers of recreational vehicles. Background technique [0002] At present, many foreign patents have improved the performance of the electromagnet, such as the patent patnet4014412 of the Warnnel Electromagnetic Brake Clutch Company in 1977 in the United States, which provides a mechanical structure that prevents the electromagnet itself from rotating; another U.S. patent designates the electromagnet It is quasi-elliptical, and the filled friction material is asymmetrically distributed on the friction surface with respect to the short axis, which improves the anti-overturning moment and uneven wear in the direction of motion. But the magnetic circuit of the electromagnet is symmetrical about the major axis of the quasi-ellipse. From the brakin...

AI Technical Summary

Problems solved by technology

It has been reported that due to the symmetrical magnetic circuit, the outer side of the electromagnet is first worn out and the coil is exposed and scrapped, which affects the life

In addition, it can be seen from the analysis of circular motion that the electromagnet itself about the elliptical long-axis symmetric magnetic circuit will inevitably produce a torque that causes the rotation tendency. The high torque causes a large stress at the movable joint, which is prone to jamming and affects braking.

Patent 2004200784379 adopts the method of different cross-sectional areas of the inner and outer magnetic circuits of the electromagnet (so the magnetic resistance is different) to change the magnitude of the electromagnetic force to achieve uniform wear and reduce the tendency of rotation, but this method has three disadvantages: 1) The cross-sectional area becomes larger On one side, the space for placing the coil becomes smaller, so that the number of ampere turns of the coil is limited, and the total electromagnetic force is small

2) The equivalent air gap problem of the magnetic circuit between the friction surfaces is not considered. The actual measurement and calculation show that the equivalent air gap exists, so the asymmetric effect of the actual electromagnetic force becomes smaller

3) The center of gravity deviates from the connection at the geometric center, causing gravity imbalance factors

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