1. Definitions
Electromagnetic Retarder is an automobile auxiliary braking device, commonly known as electric brake.
2. Application
Ministry of China began the implementation of the latest release of July 1, 2002, “passenger vehicles Classification and grading” the required standards, more than the high two buses must install brake slow speed devices. In an interview with reporters bus manufacturer found that nearly all the high-end passenger car eddy current retarder installation, imported products like Shanghai Sunwin Bus, Zhengzhou Yutong Bus, Dongfeng Nissan Diesel bus chassis, such as the use of Xiamen Golden Dragon, mostly in France Tellabs horse and Spain Frey Nasa eddy current retarder, domestic eddy current retarder technology is more advanced manufacturers only Kaimai (Luoyang) electrical Co., Ltd. – membership in the aircraft industry. According to the source, the French Tellabs horse is the world’s oldest and one of retarder production and the largest electricity supplier in Germany, Italy, Spain and other countries have established subsidiaries, and 500 worldwide a number of distributors, products are F, C, H three series of nearly 100 types, 5 years ago to provide a reliable security products for our bus. They passenger cars for the Chinese market needs and characteristics of development, has developed a control handle, foot control and ABS control system connected to the system, it is an ideal combination retarder device to adapt the way city and mountain use. In addition, bus companies more choice as well as Japan’s Hino brand eddy current retarder, the quality is relatively stable, relatively slightly higher. It is reported that China has many enterprises are also being developed this technology, but has become the scale, mass-produced only Kaimai (Luoyang) Electrical Co., Ltd. – Production of DHQ, DHB, DHZ type retarder, it absorbs foreign advanced technology, and make improvements based on vehicle characteristics of China, it has been successfully applied in the major bus company, and Xiamen Golden dragon, Zhengzhou Yutong, Guangzhou Isuzu bus. It is not only small size, light weight, and the price is lower than imported products.
3, Principle
The means mounted 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.
generally eddy current retarder stator, a rotor and a fixed frame composition.
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.
4, the superiority of
mount electrical eddy current retarder can increase safety, economy, environmental protection, stability and comfort of the vehicle, in particular, its safety, economy the superiority and environmental aspects as follows:
1. security
(1) can be negative for most of the braking operation of the vehicle load, the wheel brake temperature greatly reduce to ensure that the wheel brakes in good working condition, in order to alleviate or prevent vehicle deviation, brake failure and traditional puncture and other security risks. (2) to 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, so it is better than the performance of the engine exhaust system move. (4) The direct current drive, without intermediate links, that manipulates response time is very short, only 40 milliseconds, than the fast response time retarder 20Times.
2. 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 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.
3. 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 brake maintenance repair produced more waste and sharp noise from the car brake, also 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.
5 Characteristics
Electromagnetic Retarder cars and heavy vehicles typically used in the train. It has a larger braking strength, and easy control.
6, the 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.
7, the operation of
In normal driving the car, Despite the high speed rotation of the rotor with the drive shaft, but the coil is not energized at this time, there is no magnetic core, it does not produce a braking torque, when the exciting current through the coil, the core will produce a number of a plurality of magnetic field through the core portion increase flux and reduce magnetic flux away from the core portion, thereby generating eddy current rotor disk, the rotor disk carrier subjected to a force in a magnetic field, the effect opposite to the direction of rotation of the rotor disc, 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.