Cooling of a permanent magnet electric motor with a centrifugal impeller

Li, Hongmin

doi:10.1016/j.ijheatmasstransfer.2009.09.022

Cited by 57 publications

(17 citation statements)

References 19 publications

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“…In their study, thermal flux plot, the isothermal distribution, thermal gradients in different parts of SRM at its different rotor positions and the respective governing equation are presented. Li [22] presented a thermal fluid analysis on the air cooling of a permanent magnet electric motor with a centrifugal impeller numerically and experimentally. In their findings, the cooling flow rate is proportional to the motor rotation speed and cooling is a determining factor for the motor torque rating.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on electromagnetics and thermal cooling of a switched reluctance motor

Jang

Chiu

Yan

et al. 2015

Case Studies in Thermal Engineering

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a b s t r a c tIn this study, the coupled thermomagnetic system of a switched reluctance motor for cooling performance improvement has been conducted numerically. The switched reluctance motor (SRM) with output power of 3 kW and air cooling is under investigation. Aluminum cooling fins are fitted on the cooling casing of the motor in order to increase the convection surfaces. The commercial softwares used in this paper are JMAG-Designer and CFD-RC for electromagnetic field and thermal field analyzes, respectively. The electromagnetic analysis for the switched reluctance motor is obtained in advanced in order to obtain the energy losses. They can then be treated as the heat sources for heat transfer analysis. Transient solutions for the temperatures of the components in SRM are calculated during operation. The transient temperature of SRM is analyzed for both with and without cooling casing. The influence of forced convection by the internal fan of the SRM is also under investigation. Results show the numerical model is in good agreement to the real practice. The model can be used for the SRM cooling design.

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Section: Introductionmentioning

confidence: 99%

Numerical study on electromagnetics and thermal cooling of a switched reluctance motor

Jang

Chiu

Yan

et al. 2015

Case Studies in Thermal Engineering

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“…The commercial software package, ANSYS-FLUENT, is used for the simulation runs [40]. The relaxation factor for the mass, momentum, energy, turbulence kinetic energy, and turbulence dissipation rate are 0.8, 0.6, 0.9, 0.8, and 0.8 respectively [41]. The iterative solution procedure continues until the residuals of the mass conservation equation, momentum conservation equation, and equations for turbulence quantities are all smaller than 10 −4 , while the residual of the energy equation is lower than 10 −6 .…”

Section: Finite Volume Analysis (Fva)mentioning

confidence: 99%

Design Optimization and Analysis of Afpm Synchronous Machine Incorporating Power Density, Thermal Analysis, and Back-Emf THD

Kahourzade¹,

Gandomkar²,

Mahmoudi³

et al. 2013

PIER

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Abstract-This paper presents the design and analysis of an inside-out axial-flux permanent-magnet (AFPM) synchronous machine optimized by genetic algorithm (GA) based sizing equation, finite element analysis (FEA) and finite volume analysis (FVA). The preliminary design is a 2-pole-pair slotted TORUS AFPM machine. The designed motor comprises sinusoidal back-EMF waveforms, maximum power density and the best heat removal. The GA is used to optimize the dimensions of the machine in order to achieve the highest power density. Electromagnetic field analysis of the candidate machines from GA with various dimensions is then put through FEA in order to obtain various motor characteristics. Based on the results from GA and FEA, new candidates are introduced and then put through FVA for thermal behavior evaluation of the designed motors. Techniques like modifying the winding configuration and skewing the permanent magnets are also investigated to attain the most sinusoidal back-EMF waveform and reduced cogging torque. The performance of the designed 1 kW, 3-phase, 50 Hz, 4-pole AFPM synchronous machine is tested in simulation using FEA software. It is found that the simulation results fully agree with the designed technical specifications. It is also found from FVA results that the motor temperature reaches at highest temperature to 87 • C at the rated speed and full load under steady state condition.

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“…To cope with the high power density, the forced convective cooling scheme was employed at the expense of external power consumption. In this respect, the thermal performances for the air-cooled [6][7][8][9][10][11][12][13][14], water-cooled [15][16][17] and oil-cooled [18] electric motors were numerically and, or, experimentally studied. In addition to the relative low cooling capacity of the forced convective airflow, the emission of acoustic noise from the fan was a major problem.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer and Thermal Management of Interior Permanent Magnet Synchronous Electric Motor

Hsieh

Cai

et al. 2019

Inventions

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Geometric complexities and multi-physical phenomena add difficulties for predicting the thermal field and hence thermal management of an electric motor. A numerical design model that combined electromagnetic and thermal-fluid analysis was proposed for disclosing the detailed temperature distributions of each component in an electric motor. The thermal fluid analysis implemented ANSYS-Fluent code to unravel the thermal field of the interior permanent magnet synchronous electric motor fitted with a smooth or novel spirally twisted channel in the cooling water jacket of a stator with and without shaft cooling. In accordance with the thermal powers converted from the various electromagnetic losses of the electric motor, the complex heat conduction model with realistic thermal boundary conditions was formulated. Initially, the turbulent flow structures and channel averaged Nusselt numbers of the spiral channels without and with the sectional twist were comparatively examined for acquiring the convective thermal boundary conditions in the water jacket. With the high thermal conductivity of the aluminum water jacket, the heat-transfer improvements from the smooth-spiral-channel conditions by using the twisted spiral channel were effective for reducing the average temperatures by about 10% but less effective for altering the characteristic thermal field in the water jacket. At 1290 < Dn < 6455 or 5000 < Re < 25,000 for the spiral channel flows, the channel average Nusselt numbers ratios between the smooth and twisted spiral channels were elevated to 1.18–1.09 but decreased with the increase of Dn or Re. A set of heat-transfer correlations for estimating the Nusselt numbers of Taylor flow in the rotor-to-stator air gap was newly devised from the data available in the literature. While the cooling effectiveness of the water jacket and shaft was boosted by the sectional twists along the spiral channel of the water jacket, the presence of Taylor flow in the annual air gap prohibited the effective rotor-to-stator heat transmission, leading to hot spots in the rotor. By way of airflow cooling through the rotating hollow shaft, the high temperatures in the rotor were considerably moderated. As the development of Taylor flow between the rotor and stator was inevitable, the development of active or passive rotor cooling schemes was necessary for extending the power density of an electric motor. Unlike the previous thermal circuit or lumped-parameter thermal model that predicted the overall temperatures of motor components, the present coupled electromagnetic and thermal-fluid model can reveal the detailed temperature distributions in an electric motor to probe the local hot spots of each component in order to avoid overheating at the early design stage.

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Cooling of a permanent magnet electric motor with a centrifugal impeller

Cited by 57 publications

References 19 publications

Numerical study on electromagnetics and thermal cooling of a switched reluctance motor

Numerical study on electromagnetics and thermal cooling of a switched reluctance motor

Design Optimization and Analysis of Afpm Synchronous Machine Incorporating Power Density, Thermal Analysis, and Back-Emf THD

Heat Transfer and Thermal Management of Interior Permanent Magnet Synchronous Electric Motor

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