No-load Features of T-LSMs With Quasi-Halbach Magnets: Application to Free Piston Engines

The paper is devoted to the prediction followed by the enhancement of the no-load features of tubular linear synchronous machines (T-LSMs) with quasi-Halbach magnetized PMs in the mover. The study is initiated by the prediction of the spatial repartition of the no-load air gap flux density. Then, a formulation of the back-EMF and the cogging force, based on the predicted spatial repartition of the no-load air gap flux density, is developed, considering 1) the case of an infinite length machine and 2) the case of a finite length one. A case study, corresponding to an initial concept, is treated with the prediction of its no-load features. The study is extended to the enhancement of these features with emphasis on the effects of two influent sizing parameters, assuming an infinite length machine. This enables the identification of a preoptimized concept. The back-EMF and the cogging force of this latter are then predicted in the case of a finite length machine. A further enhancement of these features is gained, thanks to a quasicancellation of the end effect. The prediction of the back-EMF and the cogging force of the optimized T-LSM with quasi-Halbach magnetized PMs has clearly demonstrated the effectiveness of the proposed approach.

[1]  Ahmed Masmoudi,et al.  Prediction of the air gap flux density distribution of a T-LSM with quasi-Halbach magnetized PMs: Application to the cogging force minimization , 2015, 2015 Tenth International Conference on Ecological Vehicles and Renewable Energies (EVER).

[2]  Changliang Xia,et al.  Modeling and Analyzing of Magnetic Field of Segmented Halbach Array Permanent Magnet Machine Considering Gap Between Segments , 2014, IEEE Transactions on Magnetics.

[3]  He Zhang,et al.  Demagnetization Analysis for Halbach Array Configurations in Electrical Machines , 2015, IEEE Transactions on Magnetics.

[4]  Ahmed Masmoudi,et al.  MEC-Based Modeling and Sizing of a Tubular Linear PM Synchronous Machine , 2015, IEEE Transactions on Industry Applications.

[5]  Johannes J H Paulides,et al.  Three-Dimensional Magnetic Field Modeling of a Cylindrical Halbach Array , 2010, IEEE Transactions on Magnetics.

[6]  Z. Zhu,et al.  Halbach permanent magnet machines and applications: a review , 2001 .

[7]  D. Howe,et al.  Synthesis of cogging torque waveform from analysis of a single stator slot , 2005, IEMDC 2005.

[8]  Jiabin Wang,et al.  Design and Experimental Verification of a Linear Permanent Magnet Generator for a Free-Piston Energy Converter , 2007, IEEE Transactions on Energy Conversion.

[9]  A.J.A. Vandenput,et al.  Cogging Force Reduction in Tubular Permanent Magnet Actuators , 2007, 2007 IEEE International Electric Machines & Drives Conference.

[10]  L. Cheng,et al.  Research on a tubular yokeless PM linear machine , 2015, 2015 IEEE Magnetics Conference (INTERMAG).

[11]  K. Halbach.  Design of permanent multipole magnets with oriented rare earth cobalt material , 1980 .

[12]  Ahmed Masmoudi,et al.  On the analytical prediction of the force production capability of a quasi-Halbach PM excited T-LSM , 2016, 2016 Eleventh International Conference on Ecological Vehicles and Renewable Energies (EVER).

[14]  D. Howe,et al.  Tubular modular permanent-magnet machines equipped with quasi-Halbach magnetized magnets-part I: magnetic field distribution, EMF, and thrust force , 2005, IEEE Transactions on Magnetics.

[15]  Z.Q. Zhu,et al.  Recent Development of Halbach Permanent Magnet Machines and Applications , 2007, 2007 Power Conversion Conference - Nagoya.

[16]  Ahmed Masmoudi,et al.  Analytical Prediction of the No-Load Operation Features of Tubular-Linear Permanent Magnet Synchronous Machines , 2016, IEEE Transactions on Magnetics.

[17]  Kui Li,et al.  Design Optimization of a Tubular Permanent Magnet Machine for Cryocoolers , 2015, IEEE Transactions on Magnetics.

[18]  E. A. Lomonova,et al.  3-D Analytical and Numerical Modeling of Tubular Actuators With Skewed Permanent Magnets , 2011, IEEE Transactions on Magnetics.

[19]  Shuang Gao,et al.  Design of a linear magnetic-geared free-piston generator for series hybrid electric vehicles , 2010, 2010 IEEE Vehicle Power and Propulsion Conference.

[20]  Liang Yan,et al.  Armature Reaction Field and Inductance of Coreless Moving-Coil Tubular Linear Machine , 2014, IEEE Transactions on Industrial Electronics.

[21]  J J H Paulides,et al.  Analysis of 3-D Effects in Segmented Cylindrical Quasi-Halbach Magnet Arrays , 2011, IEEE Transactions on Magnetics.

[22]  M. Henke,et al.  A free-piston PM linear generator in vernier topology using quasi-Halbach-excitation , 2014, 2014 International Conference on Electrical Machines (ICEM).