Abstract
Trucks have the problems of frequent braking and long-term braking during long-slope transportation. As the temperature of the traditional eddy current retarder is as high as 500 °C during braking, the braking torque of the retarder is seriously degraded. According to the principle of eddy current braking and current thermal effect, this paper proposes an eddy current retarder in which both the stator and the excitation coil are water-cooled. The multi-field coupling and bidirectional data transmission model of stator temperature field, coil temperature field and transient electromagnetic field are established. The relationship between the braking torque and the working time is analyzed under continuous braking conditions, considering the stator temperature and the temperature of the excitation coil. It provides theoretical support for the optimal design of the retarder. A test prototype of a water-cooled eddy current retarder was manufactured, and a bench drag test was carried out. The calculation results show that the numerical simulation method of coupling between the stator temperature field, the coil temperature field and the transient electromagnetic field is adopted, and the simulation values of the braking torque is in good agreement with the experimental values.
Highlights
As a non-contact auxiliary braking device, the eddy current retarder can convert the mechanical energy of the vehicle into thermal energy by the principle of eddy current braking to achieve vehicle braking [1], [2]
This paper proposes a new type of water-cooled eddy current retarder, whose stator and electromagnetic coil are designed as a water-cooled structure
COUPLED FIELD NUMERICAL MODEL The new water-cooled eddy current retarder generates a lot of heat under continuous braking conditions, which will affect the electromagnetic characteristics of the retarder itself
Summary
As a non-contact auxiliary braking device, the eddy current retarder can convert the mechanical energy of the vehicle into thermal energy by the principle of eddy current braking to achieve vehicle braking [1], [2]. Aiming at the problem of thermal degrade of the braking torque of the eddy current retarder, domestic and foreign scholars have studied the electromagnetic field, temperature field, structural optimization and braking characteristic test of the eddy current brake devices [3]–[7]. Jin Y et al used the electromagnetic field model and the magnetic-thermal coupling model to calculate the temperature distribution and braking torque of the Halbach retarder [11]. They studied the structure and temperature field of the retarder, improved the cooling method of the retarder and considered the influence of temperature on the permeability and conductivity of the material [12]–[15]. The braking performance of the retarder is improved under continuous braking condition
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
