Temperature Calculation for Tubular Linear Motor by the Combination of Thermal Circuit and Temperature Field Method Considering the Linear Motion of Air Gap

The air gap of tubular linear motors moves linearly, causing heat transfer states of the motor to alternate repeatedly. Thus, the heat transfer coefficients of the mover inner surface and the stator outer surface vary constantly. In this paper, the combination model of the thermal circuit and temperature field is established to calculate the transient temperature rise of a tubular linear motor with short and movable primary. The equivalent thermal circuit model of the moving air gap and the temperature field models of the primary (also named as mover) and secondary (also named as stator) are established. The thermal boundary conditions and the correlations among them are analyzed. By this method, the complicated variation and distribution of the heat transfer coefficients are gained. Moreover, the transient temperature rise of the motor is calculated. This method takes advantage of the flexibility of the thermal circuit method and the accuracy of the temperature field method. The calculated and tested results of the prototype are compared and analyzed.

[1]  Michel Hecquet,et al.  Multiphysics Modeling: Electro-Vibro-Acoustics and Heat Transfer of PWM-Fed Induction Machines , 2010, IEEE Transactions on Industrial Electronics.

[2]  Nicola Bianchi,et al.  A Coupled Thermal–Electromagnetic Analysis for a Rapid and Accurate Prediction of IM Performance , 2008, IEEE Transactions on Industrial Electronics.

[3]  Ion Boldea,et al.  Small Linear PM Oscillatory Motor: Magnetic Circuit Modeling Corrected by Axisymmetric 2-D FEM and Experimental Characterization , 2012, IEEE Transactions on Industrial Electronics.

[4]  Andrea Cavagnino,et al.  Evolution and Modern Approaches for Thermal Analysis of Electrical Machines , 2009, IEEE Transactions on Industrial Electronics.

[5]  Li Liyi,et al.  Thrust and Thermal Characteristics of Electromagnetic Launcher Based on Permanent Magnet Linear Synchronous Motors , 2008 .

[6]  Zhenping Li,et al.  Finite element calculation and analysis on thermal field in flat permanent magnet linear synchronous motor , 2012, World Automation Congress 2012.

[7]  Gianmario Pellegrino,et al.  End Effects in Linear Tubular Motors and Compensated Position Sensorless Control Based on Pulsating Voltage Injection , 2011, IEEE Transactions on Industrial Electronics.

[8]  Mauro Carpita,et al.  Multiphase Active Way Linear Motor: Proof-of-Concept Prototype , 2012, IEEE Transactions on Industrial Electronics.

[9]  José Roberto Cardoso,et al.  Thermal characterization of long electrical devices-application to a tubular linear induction motor , 2003, IEEE International Electric Machines and Drives Conference, 2003. IEMDC'03..

[10]  Martin Hettegger,et al.  Measurements and Simulations of the Convective Heat Transfer Coefficients on the End Windings of an Electrical Machine , 2012, IEEE Transactions on Industrial Electronics.

[11]  P. Andrada,et al.  An analytical approach to the thermal design of a double-sided linear switched reluctance motor , 2010, The XIX International Conference on Electrical Machines - ICEM 2010.

[12]  Christian Jungreuthmayer,et al.  A Detailed Heat and Fluid Flow Analysis of an Internal Permanent Magnet Synchronous Machine by Means of Computational Fluid Dynamics , 2012, IEEE Transactions on Industrial Electronics.

[13]  Liyi Li,et al.  Thrust and Thermal Characteristics of Electromagnetic Launcher Based on Permanent Magnet Linear Synchronous Motors , 2008, 2008 14th Symposium on Electromagnetic Launch Technology.

[14]  Weiming Ma,et al.  The transient thermal characteristics of periodic pulse-type linear induction motor , 2010, The XIX International Conference on Electrical Machines - ICEM 2010.

[15]  A. Boglietti,et al.  Solving the more difficult aspects of electric motor thermal analysis in small and medium size industrial induction motors , 2005, IEEE Transactions on Energy Conversion.

[16]  Li Liyi,et al.  Calculation and Experimental Study on Temperature Rise of a High OverLoad Tubular Permanent Magnet Linear Motor , 2013, IEEE Transactions on Plasma Science.

[17]  Concettina Buccella,et al.  A Coupled Electrothermal Model for Planar Transformer Temperature Distribution Computation , 2008, IEEE Transactions on Industrial Electronics.

[18]  Kenji Suzuki,et al.  Driving Method of Permanent-Magnet Linear Synchronous Motor With the Stationary Discontinuous Armature for Long-Distance Transportation System , 2012, IEEE Transactions on Industrial Electronics.

[19]  Weili Li,et al.  Electrothermal Analysis of Induction Motor With Compound Cage Rotor Used for PHEV , 2010, IEEE Transactions on Industrial Electronics.

[20]  Fabrizio Marignetti,et al.  Multiphysics Approach to Numerical Modeling of a Permanent-Magnet Tubular Linear Motor , 2010, IEEE Transactions on Industrial Electronics.

[21]  Wei Hua,et al.  Investigation and General Design Principle of a New Series of Complementary and Modular Linear FSPM Motors , 2013, IEEE Transactions on Industrial Electronics.

[22]  Fang Deng.  An improved iron loss estimation for permanent magnet brushless machines , 1997 .

[23]  Changsoo Jang,et al.  Heat transfer analysis and simplified thermal resistance modeling of linear motor driven stages for SMT applications , 2003 .

[24]  Gordon R. Slemon,et al.  Modeling of iron losses of permanent-magnet synchronous motors , 2003 .

[25]  J. H. Seo,et al.  Research on stator temperature field of a hydro-generator with skin effect , 2011 .

[26]  Fabrizio Marignetti,et al.  Design of Axial Flux PM Synchronous Machines Through 3-D Coupled Electromagnetic Thermal and Fluid-Dynamical Finite-Element Analysis , 2008, IEEE Transactions on Industrial Electronics.

[27]  Dallas D. Hill,et al.  Development and Validation of a Thermal Model for Electric Induction Motors , 2010, IEEE Transactions on Industrial Electronics.