Analysis of End-Winding Thermal Effects in a Totally Enclosed Fan-Cooled Induction Motor With a Die Cast Copper Rotor

Ahmed, Firoz; Kar, Narayan C.

doi:10.1109/tia.2017.2648780

Cited by 48 publications

(29 citation statements)

References 16 publications

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“…Therefore, the h conv of the frame surface can be accurately calculated by analytical methods, owing to the regular convection boundaries of the airflow condition and frame surface shapes. Similarly, the gap airflows in the peripheral direction of the gap and the Taylor number T a of the gap air is [19]…”

Section: Analytical Calculation Of Lptn Thermal Source Capacity and mentioning

confidence: 99%

Improved thermal model of forced air‐cooled motors considering heat transfer in wire‐wound winding and end region

Liu

et al. 2020

IET Electric Power Applications

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This study introduces an innovative thermal model to accurately consider the heat transfer in the winding and end region of forced air-cooled motors, which is an attractive supplement of classical lumped parameter thermal network approaches. Through coupling of the analytical method and local numerical calculations, the effective length of the winding heat path and the air convection of the end region can be exactly considered. An improved analytical derivation of the equivalent thermal conductivity of the winding is applied. To reduce the errors caused by the irregular slot type, the winding thermal resistance is calculated by the 2D numerical calculations. After that, the 3D model of the end region is built to accurately calculate the end air velocity and end convection resistance. The unknown boundaries of the 3D end model are determined by a coupling iteration. The errors of the winding thermal resistance and end convection resistance are less than 3.12 and 11%, respectively, verified by simulations and temperature tests of the prototype. Finally, the mechanism of the end region convection and its influence on the temperature rise of the entire motor are discussed in detail.

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Section: Analytical Calculation Of Lptn Thermal Source Capacity and mentioning

confidence: 99%

Improved thermal model of forced air‐cooled motors considering heat transfer in wire‐wound winding and end region

Liu

et al. 2020

IET Electric Power Applications

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“…A motor's performance is governed by its electromagnetic and thermal design, which are in fact interrelated . In order to develop compact and high‐efficient electric motors, there is a necessity to carry out thermal analysis in parallel with the electromagnetic design (Table ) .…”

Section: Thermal Analysismentioning

confidence: 99%

“…A motor's performance is governed by its electromagnetic and thermal design, which are in fact interrelated. 25,26 In order to develop compact and high-efficient electric motors, there is a necessity to carry out thermal analysis in parallel with the electromagnetic design (Table 10). 27 The thermal analysis of DOL-SynRM is carried out with two frame structures (a) conventional frame and (b) proposed frame structure using coupled field analysis.…”

Section: Thermal Analysismentioning

confidence: 99%

Single‐phase direct‐on‐line synchronous motor for a specific application in comparison with an induction motor

Ganesan

Lenin

2019

Int Trans Electr Energ Syst

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Summary The efficiency of the motor is of paramount importance during selection and operation as well as energy consumption. In countries like India, international efficiency class (IE2) is versatile in use. Prominent efficiency improvements can produce very large energy savings across the country. Induction motors (IMs) are widely used for pump applications in India. IM exhibits high rotor (I2R) losses due to the presence of rotor current. This results in less efficient, more energy consumption compared with energy‐efficient motors. Energy‐efficient motor such has single phase direct‐on‐line synchronous reluctance motor (DOL‐SynRM) would be a right alternative for IM due to the absence of rotor current. DOL‐SynRM has been designed, optimized, and tested for a centrifugal pump application. Initially, single phase SynRM with capacitor start and capacitor run is modeled using equivalent circuit parameters and simultaneously simulated using MATLAB. The machine parameters like rib width, length, and thickness are optimized using genetic algorithm technique. The optimized rotor structures are taken to numerical analysis platform for performance prediction. The flux distribution, moment of inertia, air gap flux density, the effect on the inductances, starting torque, average torque, and torque ripple are thoroughly investigated using this analysis. The high‐efficiency rotor structure is fabricated and configured with a centrifugal pump. Experimental results reveal that the overall system efficiency has been improved compared with the existing induction motor. Moreover, thermal analysis is carried out for two types of frame structures (conventional and proposed) to study the hot spot in the proposed motor.

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“…The challenge with LPTN modelling is the identification of on the one hand the dominant heat paths [1] and on the other hand the thermal parameter values of the LPTN elements, which have a considerable impact on the accuracy of temperature prediction [15,16]. These thermal parameters can either be calculated in a direct manner through analytical relations and empirical formulas from literature [16][17][18][19], or alternatively be determined through an inverse methodology by using temperature measurements as a reference for the model outputs [11,[20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

“…However, only steady-state regime was considered since thermal capacitances were absent. A higher-order LPTN was considered for the thermal analysis of an induction motor with a die cast copper rotor in [18], where it was shown that the stator end winding transient temperature could be predicted for different motor loadings, although the maximal modelling error was still close to 5 • C. Finally, in [12,28] the short-time transient behavior of the stator windings of an induction motor was examined for the first few minutes of operation.…”

Section: Introductionmentioning

confidence: 99%

Inverse Thermal Identification of a Thermally Instrumented Induction Machine Using a Lumped-Parameter Thermal Model

et al. 2019

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Accurate temperature estimation inside an electrical motor is key for condition monitoring, fault detection, and enhanced end-of-life duration. Additionally, thermal information can benefit motor control to improve operational performance. Lumped-parameter thermal networks (LPTNs) for electrical machines are both flexible and cost-effective in computation time, which makes them attractive for use in real-time condition monitoring and integration in motor control. However, the accuracy of these thermal networks heavily depends on the accuracy of its system parameters, some of which are difficult to calculate analytically or even empirically and need to be determined experimentally. In this paper, a methodology for the thermal condition monitoring of long-duration transient and steady-state temperatures in an induction motor is presented. To achieve this goal, a computationally efficient second-order LPTN for a 5.5 kW squirrel-cage induction motor is proposed to apprehend the dominant heat paths. A fully thermally instrumented induction motor has been prepared to collect spatial and temporal temperature information. Using the experimental stator and rotor temperature data collected at different motor operating speeds and torques, the key thermal parameter values in the LPTN are identified by means of an inverse methodology that aligns the simulated temperatures of the stator windings and rotor with the corresponding measured temperatures. Validation results show that the absolute average thermal modelling error does not exceed 1.45 • C with maximum absolute error of 2.10 • C when the motor operates at fixed speed and torque. During intermittent motor-loading operation, a mean (maximum) stator temperature error of 0.38 • C (0.92 • C) was achieved and mean (maximum) rotor errors of 2.11 • C (3.40 • C). These results show the validity of the proposed thermal model but also its ability to predict in real time the temperature variations in stator and rotor for condition monitoring and motor control.

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Analysis of End-Winding Thermal Effects in a Totally Enclosed Fan-Cooled Induction Motor With a Die Cast Copper Rotor

Cited by 48 publications

References 16 publications

Improved thermal model of forced air‐cooled motors considering heat transfer in wire‐wound winding and end region

Improved thermal model of forced air‐cooled motors considering heat transfer in wire‐wound winding and end region

Single‐phase direct‐on‐line synchronous motor for a specific application in comparison with an induction motor

Inverse Thermal Identification of a Thermally Instrumented Induction Machine Using a Lumped-Parameter Thermal Model

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