Effect of Different Ambient Factors on Temperature Distribution in Three-Phase Induction Motor (original) (raw)
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Indonesian Journal of Electrical Engineering and Computer Science, 2019
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Thermal simulations are a very important tool for optimizing the design of electric machines. In this paper, two thermal simulation models for totally enclosed fan cooled (TEFC) induction machines are compared with thermal measurement results. For both one dimensional models of the induction machine a thermal equivalent circuit of the machine is presented. The enhanced model was built with the possibility to split the middle part into equal sized parts to model a more detailed axial temperature distribution in the machine. For modelling the circuits, MODELICA language was used in combination with the simulation tool DYMOLA.
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This paper adopted a thermal network method (TNM) based on Motor-CAD with MATLAB/Simulink software, and finite element method (FEM) based on Motor- CAD with Flux2D software, to estimate the stator winding temperature of a totally enclosed fan-cooled (TEFC), squirrel cage, three-phase induction motor. The three software packages were adopted successfully with a good agreement among their results resulting in preferring using Motor-CAD in obtaining results, and using Flux2D with MATLAB to validate these results. The success of triple-software methodology will give the induction motor designer a well-validated tool in attaining a safe motor operation without exceeding the maximum allowable stator winding temperature rise, and without using an experimental test based on an expensive manufacturing motor.
Thermal Analysis of TEFC Induction Motors
In order to manufacture smaller and more efficient electric motors an accurate prediction of the motor thermal performances at the design stage is a necessity. In addition, the thermal performance often needs to be analyzed when a motor is used in a different way to which it was originally designed for. An important example is the use of variable speed drives with induction motors designed for mains supply. These thermal requirements mean than accurate and reliable motor thermal models are required by the designers. In this paper the thermal behavior of Total Enclosed Fan Cooled (TEFC) induction motors are investigated using a commercially available software package called Motor-CAD ® . This software has been used to develop thermal models for five industrial induction motors from the same series (rated powers of 4 kW -7.5 kW -15 kW -30 kW -55 kW, 4 poles, 380 V, 50 Hz). The models produced have been experimentally verified. In particular, for each motor, the results obtained using the software's default parameters have been compared with solutions obtained using tuned parameters obtained through thermal tests. The analysis and the results reported in the paper allow us to give some general guidelines useful for obtaining accurate thermal models of TEFC induction motors. In particular we give advice on developing models for use in the calculation of motor derating when changing from mains to inverter supplies.
2010
This paper outlines a set of useful calculations and design guidelines for motor temperature rise prediction. The steady-state analysis is presented, allowing a general view about the expected temperature rise in the stator winding. For transient conditions, the starting and stall phenomena are modeled considering the factors that are often neglected: the skin effect and the heat exchange from the bars to the tooth. The end ring temperature rise is assessed. The accurate temperature rise calculation is critical for several reasons: to control the peak temperature for hazardous locations, to predict the fatigue under the heating-up and cooling-down processes, to calculate the number of consecutive starts, and to establish a safe stall time.
Thermal Performance Analysis of Induction Motor
2012
The aim of this paper is to apply a mathematical model using a lumped parameter thermal method and to conduct experiment test to determine the temperature distribution inside the induction motor to evaluate the thermal stability of the induction motor and to check whether the insulation of the copper windings is sufficient at different operating conditions, and to find out the hottest element which has the main effect on the operation and performance of the motor. We found out from the thermal model analysis that the hottest element in the induction motor is the end winding and rotor bars, this is due to stator copper losses and rotor bars losses which depend on the stator current, the stator current can be increased by increasing the torque or by decreasing the stator frequency, which makes the temperature of each element to increase. The thermal model of the induction motor is validated by comparing the calculated temperatures of each element in the induction motor with the experi...
Impact of the Fan Design and Rotational Direction on the Thermal Characteristics of Induction Motors
2018 XIII International Conference on Electrical Machines (ICEM), 2018
This document is the author's post-print version, incorporating any revisions agreed during the peer-review process. Some differences between the published version and this version may remain and you are advised to consult the published version if you wish to cite from it. Φ Abstract-Low manufacturing cost and high reliability make the induction machine suitable for different constant and variable speed applications. For machines operating in hazardous environments, the fully enclosed type is used, with limited access to the stator and rotor. Indirect air cooling method is usually employed with fins casing and an attached fan. Thus, the fan design is crucial as being the only resource to remove heat away from the machine. A poor thermal management of the electrical machine can lead to a machine failure and reduce the machine lifespan. Some machines are operating for bi-directional operation, which means the performance of the machine should be reviewed under both conditions. This paper focus on the impact of the fan cooling on the thermal profile of a 5.5 kW induction machine under bidirectional operation. Comparative studies using CFD simulations have been carried out to identify the effect of different fan types when operating at particular conditions. The performed work provides an understanding of the air flow under bi-directional operation, which notes the importance of the fan design and rotational direction in induction machines.
An investigation into the thermal modelling of induction motors
1993
Electric motors are the ubiquitous workhorses of the industry, working a in wide range of conditions and applications. Modern motors, designed to exact ratings using new materials improved manufacturing techniques, are now much smaller but have higher loadings. They are being operated much nearer to the point of overload then ever before. To ensure a satisfactory life span for the motor, temperature rise must be limited to safe values. A lumped parameter thermal model has been developed, which allows rapid and accurate estimation of the temperature distribution in a machine. The lumped parameter thermal model depends on the accurate knowledge of the thermal coefficients and more importantly the loss distribution. Hence the temperature time technique was implemented to investigate the iron loss density distribution. Experimental results are discussed and loss density information throughout the volume of the machine was generated. A novel method of determining the thermal coefficients...
Transient 3-D thermal analysis for an air-cooled induction motor
IEEE International Conference on Electric Machines and Drives, 2005., 2005
For an induction motor that is cooled by an airflow ventilated across the air gap between the rotor and stator, the rotor endring and stator end-turn cooling might influence the motor temperatures in the core sections appreciably. Detailed motor thermal modeling is typically required to provide transient rotor temperature distributions for rotor structural analysis and to predict stator temperature distributions to assure the maximum stator temperature is below the stator insulation temperature limit. For an air-cooled induction motor, transient 3-D finite element thermal analyses for both rotor and stator have been performed in this paper. In the stator thermal model, the slot conductors and various insulations were smeared and equivalent thermal properties were used to reduce modeling and computational effort. Position-dependent and time-dependent air cooling boundary conditions, which include air temperatures and forced convection heat-transfer coefficients, were applied to the 3-D thermal models.