Liquid-cooled self-excited eddy current retarder with a structure of two salient poles

#This application claims the priority benefit of Chinese Patent Application No. 201210061808.1, filed on Mar. 9, 2012, which is hereby incorporated by reference in its entirety.

#The present invention relates to an eddy current retarder for assisting in the braking of a vehicle by producing an eddy current braking moment through a metal plane or a metal cambered surface. In particular, the present invention relates to an automobile retarder with a structure of two salient poles utilizing circulated liquid for cooling, which belongs to the field of the automobile brake.

#A fundamental principle of an eddy current retarder, being used as an automobile auxiliary braking device, is as follows: When a metal plane or a metal cambered surface is moving, eddy current is generated by induction inside the plane or surface and accordingly a braking torque is generated. The kinetic energy of the automobile is converted into thermal energy to be consumed through a medium, such as a magnetic field, and thus a retarding force can be realized. A prominent characteristic of the eddy current retarder is the non-contact brake. By improving the brake performance of the automobile, rapid loss of a brake block and a tire caused by friction in the traditional way of braking can be avoided. Moreover, the braking noise can be eliminated; the environmental pollution can be avoided; safety, comfort and economic efficiency in driving the car can be greatly improved; the fatigue of a driver can be alleviated; the working efficiency can be improved; the slamming on the brake can be reduced; and the car is smoother to drive. In addition to the advantages of the eddy current retarder the self-excited eddy current retarder is also capable of self-generating such that additional or enlarged power generator and storage battery of the automobile are unnecessary. Further, the issue of matching a retarder excitation power supply and a car-mounted power supply is eliminated.

#FIG. 1 illustrates a structural front view of a retarder in accordance with an embodiment of the present invention.

#FIG. 2 illustrates a structural side view of the retarder in accordance with an embodiment of the present invention.

#Numeration of various components illustrated in FIG. 1 is as follows: 1. rectifier module; 2. controller; 3. switch device; 4. retarder holder; 5. retarder stator; 6. coolant channel; 7. conducting wire jacket; 8. retarder coil; 9. retarder rotor; 10. generator permanent magnetic poles; 11. generator armature core; 12. generator armature winding; 13. rotating shaft.

#A sample embodiment of the invention is further stated as follows with reference to the attached illustrations.

#As shown in FIG. 1 and FIG. 2, the retarder rotor 9 of the sample embodiment is connected with the rotating shaft 13 through a spline. The retarder rotor 9 is of the jagged structure as shown in FIG. 2. The axial cross section of the jagged turntable is in an inverted h shape. Two salient poles of the retarder rotor 9 is located at two axial ends of the jagged turntable, one salient pole at a respective axial end. The retarder coil 8 is centrally wound, and is disposed between the two salient poles of the retarder rotor 9 and is affixed on the inner wall of the retarder stator 5. The retarder stator 5 is installed on a body frame of an automobile. A liquid coolant inside an external coolant channel 6 of the retarder stator 5 is circulated with a cooling liquid, e.g., water, of the generator or with an independent cooling device of the retarder. Multiple pairs of generator permanent magnetic poles 10 are installed on the inner wall of the retarder rotor 9, and the rotating shaft 13 can drive the retarder rotor 9 and the generator permanent magnetic poles 10 to rotate. The retarder generator is located inside the retarder, and the generator armature winding 12 and the generator armature core 11 are installed on the retarder holder 4. The generator armature winding 12 is connected with the retarder coil 8 through the rectification module 1 and the switch device 3. One end of the controller 2 is connected to the input end of the rectification module 1, and the other end of the controller 2 is connected to the control end of the switch device 3.