On the Comparison Between the Stator- and Rotor-excited Claw Pole Alternators

Abstract This article compares the electromagnetic features of rotor-excited claw pole alternators and stator-excited claw pole alternators, which share the same rotor active length. Accounting for the 3D flux path characterizing both machines, the comparison study is based on a 3D finite-element analysis. Following a description of the flux linkage in these machines, special attention is paid to the investigation of their magnetic features, including the air gap spatial repartition of the flux density, torque-angle characteristics, and no-load characteristics. It has been found that the rotor-excited claw pole alternator exhibits a higher back-electromotive force production capability than the stator-excited claw pole alternator, which is penalized by (i) the additional lateral air gaps located in between the collectors and the magnetic rings, and (ii) the homopolar flux. The torque production capability of the stator-excited claw pole alternator is also affected by these drawbacks at low values of the field current. Increasing this leads to a saturation of the rotor-excited claw pole alternator, whose torque production is similar to that of the stator-excited claw pole alternator.

[1]  G. Henneberger,et al.  Transient 3-D FEM computation of eddy-current losses in the rotor of a claw-pole alternator , 2004, IEEE Transactions on Magnetics.

[2]  A. Reinap,et al.  Evaluation of a semi claw-pole machine with SM2C core , 2011, 2011 IEEE International Electric Machines & Drives Conference (IEMDC).

[3]  A. Foggia,et al.  Influence of Magnetic Materials on Claw Pole Machines Behavior , 2010, IEEE Transactions on Magnetics.

[4]  Fengge Zhang,et al.  Comparative Study on Claw Pole Electrical Machine with Different Structure , 2007, 2007 2nd IEEE Conference on Industrial Electronics and Applications.

[5]  Thomas G. Habetler,et al.  An analysis and discussion of the voltage and current spectrum of claw-pole alternators for fault detection purposes , 2011, 8th IEEE Symposium on Diagnostics for Electrical Machines, Power Electronics & Drives.

[6]  M. Alakula,et al.  A comparison between PMSM, EMSM and SMSM in a BAS application , 2008, 2008 18th International Conference on Electrical Machines.

[7]  Amina Ibala,et al.  Accounting for the Armature Magnetic Reaction and Saturation Effects in the Reluctance Model of a New Concept of Claw-Pole Alternator , 2010, IEEE Transactions on Magnetics.

[8]  L. Gerbaud,et al.  Automatic generation of sizing models for the optimization of electromagnetic devices using reluctance networks , 2004, IEEE Transactions on Magnetics.

[9]  K. Hameyer,et al.  Study of Hybrid Excited Synchronous Alternators for Automotive Applications Using Coupled FE and Circuit Simulations , 2008, IEEE Transactions on Magnetics.

[10]  Amina Ibala,et al.  3D FEA based feature investigation of a claw pole alternator with DC excitation in the stator , 2010, 2010 7th International Multi- Conference on Systems, Signals and Devices.

[11]  Jianguo Zhu,et al.  Effect of Armature Reaction of a Permanent-Magnet Claw Pole SMC Motor , 2007, IEEE Transactions on Magnetics.

[12]  Jeong-Jong Lee,et al.  Characteristic Analysis of Claw-Pole Machine Using Improved Equivalent Magnetic Circuit , 2009, IEEE Transactions on Magnetics.

[13]  M. Alakula,et al.  Comparison between a novel claw-pole electrically magnetized synchronous machine without slip-rings and a permanent magnet machine , 2003, IEEE International Electric Machines and Drives Conference, 2003. IEMDC'03..

[14]  G. Henneberger,et al.  Numerical procedures for the calculation and design of automotive alternators , 1997 .