Thermal Analysis of the Driving Component Based on the Thermal Network Method in a Lunar Drilling System and Experimental Verification
Abstract
:1. Introduction
2. Structure of the Driving Component and Heat Source Analyses
2.1. Structure of the Driving Component
2.2. Heat Source Analyses of the Rotary Motor
2.2.1. Analyses of Iron Loss
2.2.2. Analyses of Copper Loss
2.2.3. Analyses of Mechanical Loss
2.3. Heat Source Analyses of the Planetary Reducer
3. Thermal Analyses of the Driving Component Based on the Thermal Network Method
3.1. The Basic Principle of the Thermal Network Method
3.1.1. The Principle of the Static Temperature Rise Analyses
3.1.2. The Principle of Transient Temperature Rise Analyses
3.2. Thermal Resistance
3.2.1. Conduction Resistance
3.2.2. Contact Resistance
3.2.3. Radiation Resistance
3.3. Node Partition and the Model of the Driving Component
3.4. Solution of the Temperature Rise Equations
3.5. Results and Analyses
4. Experimental Verification
4.1. Overview of the Vacuum Test Platform
4.2. Test of the Transmission Resisting Torque
4.3. Results of the Vacuum Tests
5. Thermal Network Optimization Method
5.1. Thermal Network Optimization Method Based on Heat Distribution
5.2. Optimization Result Analyses
5.3. Theoretical Prediction of the Static Temperature Field
5.4. The Prediction of Safe Working Times
6. Conclusions
- (1)
- According to a comparison of the theoretical and experimental results, the results of the TNM are reasonable and the optimization method, based on heat distribution, is feasible.
- (2)
- In the reducer, the energy was conducted from the input side to the output side, and from the sun gear to the ring. In the motor, the energy was conducted from the output side to the end, and from the stator to the axis and shell.
- (3)
- The static temperature field of mode A and mode B were acquired, and the discontinuous working mode should be used in order to avoid damage due to the high temperatures. A safe working time, in which the maximum temperature (150 °C) in the motor was predicted, and the sampling task on the moon can be achieved safely and reliably.
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Parameter and Dimension | Value | Parameter and Dimension | Value |
---|---|---|---|
Rotary Motor | Planetary Reducer | ||
Number of phases | 3 | Sun gear teeth number of high-speed level | 18 |
Rated power | 1500 W | Planetary gear teeth number of high-speed level | 18 |
Rated speed | 7860 rpm | Ring gear teeth number of high-speed level | 54 |
Number of poles | 6 | Sun gear teeth number of low-speed level | 18 |
Stator core material | 20WTG1500 (Baowu, Wuhan, China) | Planetary gear teeth number of low-speed level | 18 |
Stator outer diameter | 56 mm | Ring gear teeth number of low-speed level | 54 |
Stator inner diameter | 26 mm | Gear modulus | 1 |
Stator length | 100 mm | Gear pressure angle | 20° |
Rotor core material | 45# steel | Transmission ratio of each level | 4:1 |
Outer diameter | 60 mm | Transmission ratio | 16:1 |
Permanent magnets | XGS223/160 (XETC, Chengdu, China) | Addendum coefficient | 1 |
Airgap length | 1.3 mm | Clearance coefficient | 0.25 |
Active axial length | 140 mm | - | - |
Serial Number | Definition | Value | Conductivity | Specific Heat | Density |
---|---|---|---|---|---|
(W/m·K) | (J/kg·K) | (kg/m3) | |||
1 | Average temperature of the end axis of the motor near bearing | T1 | 45 | 490 | 7800 |
2 | Average temperature of the axis near the hall sensor | T2 | 45 | 490 | 7800 |
3 | Average temperature of the end surface | T3 | 126 | 871 | 2660 |
4 | Average temperature of the contact area of the axis and the inner ring of the bearing | T4 | 45 | 490 | 7800 |
5 | Average temperature of the contact area of the inner ring and the ball | T5 | 38.2 | 492 | 7822 |
6 | Average temperature of the contact area of the outer ring and the ball | T6 | 38.2 | 492 | 7822 |
7 | Average temperature of the contact area of the end cover and the outer ring | T7 | 38.2 | 492 | 7822 |
… | … | … | … | … | … |
97 | Average temperature of the stator tooth of the front part of the motor | T97 | 2.7 | 415.7 | 8200 |
98 | Average temperature of the stator yoke of the front part of the motor | T98 | 40 | 480 | 7700 |
99 | Average temperature of the stator surface of the front part of the motor | T99 | 40 | 480 | 7700 |
100 | Average temperature of the shell surface of the front part of the motor | T100 | 126 | 871 | 2660 |
Location | Iron Loss | Copper Loss | Gear Meshing Loss | Bearing Loss |
---|---|---|---|---|
Heat source (W) | 14.5461 | 3.8789 | 12.1994 | 1.3352 |
Mode | Speed (rpm) | Load (Nm) | Temperature (°C) | Heat Flow (W) |
---|---|---|---|---|
A | 160 | 15 | 80 | 74.4 |
B | 480 | 9 | 80 | 99.6 |
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Tang, D.; Xiao, H.; Kong, F.; Deng, Z.; Jiang, S.; Quan, Q. Thermal Analysis of the Driving Component Based on the Thermal Network Method in a Lunar Drilling System and Experimental Verification. Energies 2017, 10, 355. https://doi.org/10.3390/en10030355
Tang D, Xiao H, Kong F, Deng Z, Jiang S, Quan Q. Thermal Analysis of the Driving Component Based on the Thermal Network Method in a Lunar Drilling System and Experimental Verification. Energies. 2017; 10(3):355. https://doi.org/10.3390/en10030355
Chicago/Turabian StyleTang, Dewei, Hong Xiao, Fanrui Kong, Zongquan Deng, Shengyuan Jiang, and Qiquan Quan. 2017. "Thermal Analysis of the Driving Component Based on the Thermal Network Method in a Lunar Drilling System and Experimental Verification" Energies 10, no. 3: 355. https://doi.org/10.3390/en10030355