Influence of the Variable Cross-Section Stator Ventilation Structure on the Temperature of an Induction Motor
Abstract
:1. Introduction
2. Motor Model
2.1. Hydrodynamic Model
2.2. Motor Heat Transfer Model
2.3. Physical Model and Pretreatment
2.4. Basic Assumptions and Boundary Conditions
- The influence of buoyancy and gravity on the fluid flow is ignored.
- Given that the fluid flow is slower than sound, the fluid is treated as an incompressible fluid.
- It is assumed that the heat is evenly distributed in the components of the motor.
- The entrance boundary is defined as the velocity entrance with its velocity at 25.5 m/s.
- The outlet boundary is defined as the pressure outlet with the initial pressure at 1 atmosphere.
- The solid surfaces in contact with air are set as non-slip boundary conditions.
2.5. Calculation of Motor Heat
3. Simulation and Analysis of Original Ventilation Model
4. Analysis of Motor Temperature Field and Fluid Field under Different Stator Ventilation Structures
4.1. Analysis of the Nonlinear Variable Cross-Section Stator Ventilation Structure
4.2. Analysis of the Linear Variable Cross-Section Stator Ventilation Structure
4.3. Analysis of Stator Ventilation Structure with Varying Cross-Sectional Diameter
4.4. Analysis of Stator Ventilation Structure with Varying Radial Position
5. Conclusions
- (1)
- The cooling effect of the nonlinear variable cross-section cylindrical stator ventilation structure is more effective than that of the original ventilation structure, and with an increase in the number of segments, the temperature of each part of the motor shows a downward trend.
- (2)
- Under the same cross-sectional diameter, the cooling effect of the linear variable cross-section ventilation hole shows a small difference compared to that of the nonlinear variable cross-section ventilation hole. However, making a linear variable cross-section hole is technically challenging and the cost is also very high, while the nonlinear variable cross-section hole can be realized through stator core splicing, so the nonlinear cross-section ventilation hole is more desirable.
- (3)
- As the cross-sectional diameter of the stator ventilation hole decreases, the temperature of each part of the motor drops significantly. However, when the diameter is reduced to a certain value, the increasing trend of the wind velocity in the stator ventilation hole slows down, and the temperature of the stator changes only slightly. If the diameter is continuously reduced, the wind velocity in the rotor ventilation hole will increase, and the temperature of the rotor will continue to decrease.
- (4)
- The maximum temperature appears on the side of the air outlet, and it is greatly affected by the circulation wind speed and the circulation radius at the end. When the ventilation holes are close to the winding, the air from the stator ventilation holes can directly cool the end of the winding, which has a better dissipation effect.
- (5)
- By gradually attempting to identify a better scheme, the optimal stator ventilation structure is obtained. Compared to the original ventilation model, the maximum temperatures of the stator winding, stator core, rotor bar, rotor core, and slot insulation are reduced by 17.13 °C, 14.56 °C, 46.53 °C, 43.81 °C, and 16.56 °C, respectively. The cooling effect is obvious, and the heat dissipation capacity of the motor is significantly enhanced.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Parameter | Value |
---|---|
Rated Power | 600 (kW) |
Rated Voltage | 2730 (V) |
Rated Current | 155 (A) |
Current Density | 5.47 (A/mm2) |
Frequency | 155.55 (Hz) |
Speed | 4636 (r/min) |
Efficiency | 94% |
Power Factor | 0.87 |
Stator Core Length | 270 (mm) |
Stator Outer Diameter | 555 (mm) |
Stator Inner Diameter | 330 (mm) |
Air gap length | 1.8 (mm) |
Rotor Inner Diameter | 330 (mm) |
Number of stator slots | 60 |
Number of rotor slots | 48 |
The radial position of the stator ventilation hole | 257.5 (mm) |
Parameter | Value |
---|---|
Stator Winding | 5.814 (kW) |
Stator Yoke | 5.285 (kW) |
Stator Teeth | 2.667 (kW) |
Rotor Bar | 3.900 (kW) |
Rotor | 0.42 (kW) |
Additional loss | 3.159 (kW) |
Mechanical loss | 7.56 (kW) |
Scheme | Cross-Sectional Diameter (mm) | Radial Position (mm) |
---|---|---|
6 | 24-22-20-18-16 | 257.5 |
7 | 22-20-18-16-14 | 257.5 |
8 | 20-18-16-14-12 | 257.5 |
Scheme | Cross-Sectional Diameter (mm) | Radial Position (mm) |
---|---|---|
9 | 22-20-18-16-14 | 247.5 |
10 | 22-20-18-16-14 | 237.5 |
11 | 22-20-18-16-14 | 227.5 |
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Cao, J.; Yan, H.; Li, D.; Wang, Y.; Li, W. Influence of the Variable Cross-Section Stator Ventilation Structure on the Temperature of an Induction Motor. Energies 2021, 14, 5249. https://doi.org/10.3390/en14175249
Cao J, Yan H, Li D, Wang Y, Li W. Influence of the Variable Cross-Section Stator Ventilation Structure on the Temperature of an Induction Motor. Energies. 2021; 14(17):5249. https://doi.org/10.3390/en14175249
Chicago/Turabian StyleCao, Junci, Hua Yan, Dong Li, Yu Wang, and Weili Li. 2021. "Influence of the Variable Cross-Section Stator Ventilation Structure on the Temperature of an Induction Motor" Energies 14, no. 17: 5249. https://doi.org/10.3390/en14175249