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Thermo-Structural Performance Evaluation of Cooling Mechanisms in Electrodynamic Retarders

Yunfei Liao

Yunfei Liao

School of electrical engineering, Chongqing Industry Polytechnic CollegeChina
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Liao, Yunfei
  
Mar 31, 2025
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Published Online: Mar 31, 2025
Received: Nov 10, 2024
Accepted: Mar 03, 2025
DOI: https://doi.org/10.2478/amns-2025-0847
Keywords
© 2025 Yunfei Liao, published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.

Figure 1.

Schematic diagram of torque generation mechanism in eddy current retarder
Schematic diagram of torque generation mechanism in eddy current retarder

Figure 2.

Structural schematic of the eddy current retarder. 2.1 Core, 2- Rotor disc, 3- Coil, 4- Intermediate shaft, 5- Bearing, 6- Stator housing, 7- Uniform air gap, 8- Terminal block assembly, 9- Yoke
Structural schematic of the eddy current retarder. 2.1 Core, 2- Rotor disc, 3- Coil, 4- Intermediate shaft, 5- Bearing, 6- Stator housing, 7- Uniform air gap, 8- Terminal block assembly, 9- Yoke

Figure 3.

Original and optimized rotor disc.
Original and optimized rotor disc.

Figure 4.

Geometric configuration of computational domain.
Geometric configuration of computational domain.

Figure 5.

Thermal contour mapping of rotor disc temperature distribution.
Thermal contour mapping of rotor disc temperature distribution.

Figure 6.

Three-dimensional streamline visualization of flow field dynamics during rotor disc operation.
Three-dimensional streamline visualization of flow field dynamics during rotor disc operation.

Figure 7.

Anemometer configuration for airflow velocity
Anemometer configuration for airflow velocity

Figure. 8.

Comparative airflow velocity profiles at 800 rpm
Comparative airflow velocity profiles at 800 rpm

Figure 9.

Comparative airflow velocity profiles at 1000 rpm.
Comparative airflow velocity profiles at 1000 rpm.

Figure 10.

Comparison of the retarder heat dissipation performance before and after improvement
Comparison of the retarder heat dissipation performance before and after improvement

Figure 11.

Comparative thermal fade analysis (full-duration braking test)
Comparative thermal fade analysis (full-duration braking test)

Figure 12.

Comparative thermal fade analysis (t=0-200 s)
Comparative thermal fade analysis (t=0-200 s)

Figure. 13

Comparative thermal fade analysis (t=200 s - end)
Comparative thermal fade analysis (t=200 s - end)

Airflow velocity under 800 rpm (Unit: m/s)

Test No. Type A Type B
1 23.0 40.0
2 22.9 39.7
3 23.1 38.1
4 22.5 38.5
5 22.9 37.7
Mean 22.9 38.8

Airflow velocity under 1000 rpm (Unit: m/s)

Test No. Type A Type B
1 47.1 83.5
2 47.9 82.5
3 47.3 83.4
4 47.2 83.7
5 47.2 84.3
Mean 47.3 83.5

Thermal fade test results

Parameter Type A Type B
MBf (N.m) 1952.18 1949.48
MB1 (N.m) 767.89 834.73
Fa 60.67% 57.19%
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