eddy current retarder auxiliary braking device is a motor vehicle, commonly known as electric brake.
1. The current retarder noun
Electromagnetic Retarder is an automobile auxiliary braking device, commonly known as electric brake.
2. current retarder Principle
by the general eddy current retarderA stator, a rotor and a fixed frame composition. The device is installed between the driving axle and the gearbox, braking by contact-free electromagnetic induction. px is an auxiliary braking system, the braking system is a necessary complement, but not replace the primary braking system.
When the retarder is operating, the magnetic field generated by energizing the stator coils, the rotor rotates with the shaft. Rotor Stator magnetic field lines generated by the cutting, thereby generating induction current in the spiral inside the rotor disc. In this way, the stator will be applied to the rotor a rotating force of the rotor of the electromagnetic obstruction to generate braking torque. Meanwhile, a vortex inside the rotor disc has a certain flow resistance, due to thermal effects will resistance electrical energy into heat, so that the kinetic energy of the vehicle traveling resistance heating by electromagnetic induction, and eventually converted to heat dissipation.
The operation of the eddy current retarder
when the vehicle is running normally, despite the high speed rotation of the rotor with the drive shaft, but the coil is not energized at this time, no core magnetic field, so that no braking torque, when the exciting current through the coil, it generates a number of a plurality of magnetic cores, the magnetic flux increased by the portion of the core, leaving part of the core magnetic flux is reduced, thereby generating eddy current rotor disk, rotor disc carrier in a magnetic field is subjected to the action of force, which rotate in opposite directions act in the direction of the rotor disk, hinder rotation of the rotor disc, thereby generating eddy current retarder braking torque.
eddy current retarder braking torque is generated, by adjusting the excitation current control means. The larger the exciting current through the coil, the stronger the magnetic field, the greater the braking torque.
3. The eddy current retarder composition
Electromagnetic Retarder main assembly of eddy current retarder means. The brake is composed of a stator and a rotor, a plurality of iron core and coil stator assembly, mounted between two cars stringer. The rotor consists of two rotor disks of cast iron with a cooling shaft and the rotor blades of the composition, in contact with the vehicle drive shaft, and rotates therewith.
4. Advantage of eddy current retarder
mount electrical eddy current retarder can increase safety, economy, environmental protection, stability and comfort of the vehicle, in particular, its the superiority in terms of safety, economic and environmental aspects as follows:
● security
(1) can be negative for most of the car running in the system dynamic load, the wheel brake is greatly reduced to ensure that the temperature of the wheel brakes are in good working condition, in order to alleviate or prevent deviation of the vehicle, and a conventional tire brake failure and other security risks.
(2) provide a strong braking torque over a relatively wide speed range, and good low speed performance. Speed of 10 km / h when the retarder can provide a retarder brake; speed reached 20 km / h, can achieve the maximum retarder braking torque.
(3) is a relatively independent responsive auxiliary braking system, which are fastened together with the drive shaft of the rotor, according to the wishes of the driver can at any time provide a braking torque, and thus its performance than the engine exhaust brake.
(4) using direct current drive, without intermediate links, that manipulates non-response timeVery short, only 40 ms, 20 times faster than the time response retarder.
● economy
(1) between the stator and the rotor since there is no eddy current retarder contact, there is no wear, and thus very low failure rate, usually In addition to doing a routine check, clean, other little work, so very low maintenance costs.
(2) Since the eddy current retarder to assume most of the vehicle braking torque, it is possible to extend the life of the wheel brakes, reduce maintenance costs for a vehicle brake system, increase economic efficiency. According to statistics, the vehicle mounting the electrical retarder, which brakes the wheel life can be extended at least 4-7-fold, 20 extend tire life percentage.
● environmental protection
In the friction brake lining process will produce a lot of dust, the dust contains harmful substances due to high temperature and mutate, even carcinogenic ; in addition, frequent maintenance brake repair sharp generated more noise emitted when braking wastes and cars, will have a greater environmental pollution. Eddy current retarder to assume most of the load of the wheel brakes, and thus can greatly reduce the impact on the environment of the wheel brakes.
● easy to control, braking intensity larger
Electromagnetic Retarder cars and heavy vehicles typically used in the train. It has a larger braking strength, and easy control.