The fan design impact on the rotor cooling of axial flux permanent magnet machines

Thermal management of Axial Flux Permanent Magnet (AFPM) machines is essential because it determines the machine's continuous power output and reliability. Also, thermal management is required to avoid catastrophic failure due to degradation. To help meet this challenge, a secondary cooling method can be integrated into the rotor, which can yield improved machine performance and reliability. Thermal analysis via Lumped Parameter (LM) networks is usually sufficient in predicting the thermal motor behaviour. Accuracy can be further increased with the help of Computational Fluid Dynamics (CFD), especially for devices with complex flow regions. In this paper, the fan blade was attached to the rotor of a YASA machine for flow validation, and then three different fan blade designs from other engineering applications were adopted, in order to compare the flow characteristic, power requirement and thermal characteristic for AFPM cooling applications.

[1]  T. Shih,et al.  A New K-epsilon Eddy Viscosity Model for High Reynolds Number Turbulent Flows: Model Development and Validation , 1994 .

[2]  Malcolm McCulloch,et al.  Investigation into the temperature profile of a liquid cooled YASA© AFPM machine , 2012 .

[3]  P. Durbin.  On the k-3 stagnation point anomaly , 1996 .

[4]  G. W. Carter,et al.  Electric Machines , 1967, Nature.

[5]  Keith J. Burnham,et al.  The Impact of Thermal Degradation on Properties of Electrical Machine Winding Insulation Material , 2016, IEEE Transactions on Industry Applications.

[6]  Y. C. Chong,et al.  Numerical modelling of an Axial Flux Permanent Magnet machine for convection heat transfer , 2011 .

[7]  Neil Brown,et al.  ELECTRIC MOTOR-GENERATOR FOR A HYBRID ELECTRIC VEHICLE , 2009 .

[8]  F. Menter.  Two-equation eddy-viscosity turbulence models for engineering applications , 1994 .

[9]  P. A. Durbin,et al.  RANS modeling for compressible and transitional flows , 1999 .

[10]  H. Vansompel.  Design of an energy efficient axial flux permanent magnet machine , 2013 .

[11]  P. Durbin.  SEPARATED FLOW COMPUTATIONS WITH THE K-E-V2 MODEL , 1995 .

[12]  Heinz P. Bloch,et al.  Process Plant Machinery , 1989 .

[13]  K. Mahkamov,et al.  2-D lumped-parameter thermal modelling of axial flux permanent magnet generators , 2008, 2008 18th International Conference on Electrical Machines.

[14]  J. Spurk.  Boundary Layer Theory , 2019, Fluid Mechanics.

[15]  K. Mahkamov,et al.  Computations on heat transfer in axial flux permanent magnet machines , 2008, 2008 18th International Conference on Electrical Machines.

[16]  Peter V. Nielsen,et al.  Modifications of the v2-f Model for Computing the Flow in a 3D Wall Jet , 2003 .

[17]  D. A. Howey,et al.  Dielectric characteristics of electric vehicle traction motor winding insulation under thermal ageing , 2015, 2015 IEEE 15th International Conference on Environment and Electrical Engineering (EEEIC).

[18]  N. Gregory,et al.  On the stability of three-dimensional boundary layers with application to the flow due to a rotating disk , 1955, Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences.

[19]  T.J. Woolmer,et al.  Analysis of the Yokeless And Segmented Armature Machine , 2007, 2007 IEEE International Electric Machines & Drives Conference.

[20]  M.J. Kamper,et al.  Development of a thermofluid model for Axial field permanent-magnet Machines , 2005, IEEE Transactions on Energy Conversion.

[21]  Brian E. Milton,et al.  AIR FLOW AND HEAT TRANSFER IN VENTILATED DISC BRAKE ROTORS WITH DIAMOND AND TEAR-DROP PILLARS , 2002 .

[22]  Andrew S. Holmes,et al.  Prediction and measurement of heat transfer in air-cooled disc-type electrical machines , 2010 .

[23]  Malcolm D. McCulloch,et al.  Predicting the Temperature and Flow Distribution in a Direct Oil-Cooled Electrical Machine With Segmented Stator , 2016, IEEE Transactions on Industrial Electronics.

[24]  Jacek F. Gieras,et al.  Axial Flux Permanent Magnet Brushless Machines , 2005 .

[25]  Manoochehr Darvish,et al.  TOWARD THE CFD SIMULATION OF SIROCCO FANS: FROM SELECTING A TURBULENCE MODEL TO THE ROLE OF CELL SHAPES , 2012 .