Effect of air-gap fans on cooling of windings in a large-capacity, high-speed induction motor

Kim, Chiwon; Lee, Kwan-Soo; Yook, Se-Jin

doi:10.1016/j.applthermaleng.2016.02.077

Cited by 69 publications

(26 citation statements)

References 16 publications

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“…Furthermore, when comparing to the CFD method, which requires approximately 900 million grids and more than 40 h of computational time for a single case [15], the thermal nexus model is advantageous in terms of cost because it only requires 36 nodes and the computation time is less than 1 Â 10 À3 s for a single case based on the present research with an Intel Ò Core TM i7-4790 K CPU @ 4.00 GHz. …”

Section: Performance Of Thermal Characteristic Analysismentioning

confidence: 98%

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Thermal nexus model for the thermal characteristic analysis of an open-type air-cooled induction motor

Kim

Lee

2017

Applied Thermal Engineering

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Section: Performance Of Thermal Characteristic Analysismentioning

confidence: 98%

“…Fig. 7 shows the heat transfer rate and ratio of the cooling paths to the total heat generation rate in the motor [15]. The air flow passing through the motor is defined as the internal flow, and the air flow on the boundary surface of the motor is defined as the external flow.…”

Section: Performance Of Thermal Characteristic Analysismentioning

confidence: 99%

Thermal nexus model for the thermal characteristic analysis of an open-type air-cooled induction motor

Kim

Lee

2017

Applied Thermal Engineering

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“…Another coolant-based study is the work of [8], which presents a thermal analysis for different rotor types according to the level of shield from eddy currents in order to achieve a safe thermal design of a high-speed permanent magnet (PM) motor designed for speed N = 31,500 RPM and power P = 130 kW. The research of [9] presents 3D computational electromagnetic-thermal coupled analysis to analyze the effects of auxiliary cooling fans, called air-gap fans, on winding cooling in a large-capacity N = 27,000 RPM induction motor. Results from [9] showed that flow rate distributed to the air gap was increased as the stagnant flow disappeared near the air gap because of the air-gap fans.…”

Section: Introductionmentioning

confidence: 99%

“…The research of [9] presents 3D computational electromagnetic-thermal coupled analysis to analyze the effects of auxiliary cooling fans, called air-gap fans, on winding cooling in a large-capacity N = 27,000 RPM induction motor. Results from [9] showed that flow rate distributed to the air gap was increased as the stagnant flow disappeared near the air gap because of the air-gap fans. From [9], the heat transfer coefficients at the winding surface and air gap were increased up to 31% and 90%, and total winding cooling performance was improved, on average by 55%.…”

Section: Introductionmentioning

confidence: 99%

“…Results from [9] showed that flow rate distributed to the air gap was increased as the stagnant flow disappeared near the air gap because of the air-gap fans. From [9], the heat transfer coefficients at the winding surface and air gap were increased up to 31% and 90%, and total winding cooling performance was improved, on average by 55%. The work of [10] provides fundamental insight into the heat transfer behavior in the Poiseuille-Taylor-Couette flow field set-up between the rotor and the small gap of high-speed electric motors.…”

Section: Introductionmentioning

confidence: 99%

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Experimental and Numerical Study of Windage Losses in the Narrow Gap Region of a High-Speed Electric Motor

Anderson

Lin

Wong

2018

Fluids

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Windage (drag) losses have been found to be a key design factor for high power density and high-speed electric motor development. Inducing axial flow between rotor and stator is a common method in cooling the rotor. Hence, it is necessary to understand the effect on windage while forced axial airflow is in present in the air gap. The current paper presents results from experimental testing and modeling of a high-speed motor designed to operate at 30,000 revolutions per minute (RPM) and utilize axial air cooling of 200 Liters per minute (LPM) to cool the motor. Details of the experimental apparatus and computational fluid dynamics (CFD) modeling of the small gap narrow region of the stator/rotor are outlined in the paper. The experimental results are used to calibrate the CFD model. Results for windage losses, flow rate of cooling air, power and torque of the motor versus mass flow rate are given in the paper. Trade studies of CFD on the effect of inlet cooling flow rate, and parasitic heat transfer losses on the Taylor-Couette flow coherent flow structure breakdown are presented. Windage losses on the order of 20 W are found to be present in the configuration tested and simulated.

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A novel solar‐powered master‐slave electric motor‐based energy‐saving and cooling approach for the motors of conveyor system

Ghodki

Swarup

Pal

2020

Int Trans Electr Energ Syst

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Product handling is carried out by the conveyor belts, which are moved by one or more electric motors. Hot products heat up the rollers of conveyor belt, which in turn affect the motor shaft temperature and a reduction in motor performance is observed. To overcome this overheating problem, a novel solarpowered master-slave arrangement of motors is proposed, which is operated by a robotic arm-based motor shifting mechanism controlled by an industry standard IEEE 1149.1 specification-based mixed signal embedded controller C8051F226DK. Another embedded controller of Nuvoton's N76E003AT20 is used for the temperature detection. The speed of master-slave motors is controlled by a PWM technique. The indigenously developed hardware prototype of the proposed system extracted 11.38% more solar energy than conventional supply and reported an encouraging 52.69% energy saving during the product handling on conveyor belt. As compared to the traditional methods, the experimental work achieved higher temperature reduction of the motor up to 34.26% and guaranteed the safe operation of motor. The master-slave technique, first of its kind, utilizes solar power for the motor operation during the cooling process. The proposed motor cooling approach is free from air, liquid, and PCM (phase-changing material)-based cooling. Thus, the work does not face any leakage problems and health hazards due to the wastage of water, oil and other costly and toxic cooling materials. Additionally, the motors are used with their original dimensions without any changes in motor casing. These different factors make the work competitive among other motor cooling options.

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Effect of air-gap fans on cooling of windings in a large-capacity, high-speed induction motor

Cited by 69 publications

References 16 publications

Thermal nexus model for the thermal characteristic analysis of an open-type air-cooled induction motor

Thermal nexus model for the thermal characteristic analysis of an open-type air-cooled induction motor

Experimental and Numerical Study of Windage Losses in the Narrow Gap Region of a High-Speed Electric Motor

A novel solar‐powered master‐slave electric motor‐based energy‐saving and cooling approach for the motors of conveyor system

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