Techniques for Reduction of the Cogging Torque in Claw Pole Machines with SMC Cores
Abstract
:1. Introduction
2. Cogging Torque Calculation and Analysis Method
2.1. Analysis of Cogging Torque
2.2. Calculation of Cogging Torque
3. Claw Pole Machine with SMC Core and Cogging Torque Reduction Method
3.1. Claw Pole Machine and Its Dimension
3.2. Cogging Torque Reduction Techniques in PMSM
4. Reduction of Cogging Torque by Changing the Claw Pole Shape
4.1. Claw Pole Dimension
4.2. Unequal Width Claw Pole Structure
4.3. Stator Tooth Notching
5. Reduction of Cogging Torque by Using Magnet Step Skewing
6. Reduction of Cogging Torque by Using Magnet Axial Pairing and Magnet Shifting
6.1. Magnet Axial Pairing
6.2. Magnet Shifting
7. Performance Comparison and Discussion
8. Conclusions
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Dimension and Parameters | Quantities |
---|---|
Number of phases | 3 |
Number of pole pairs | 6 |
Stator outer radius (mm) | 33.5 |
Rotor outer radius (mm) | 20.5 |
Air gap length (mm) | 1 |
Number of claw poles | 12 |
Effective axial length (mm) | 54.56 |
Pole arc of magnets and claw pole (mechanical degree) | 20 |
Magnetization direction | Radial |
Slot factor | 0.43 |
Number of turns | 256 |
PM materials | NdFeB, N30M |
Stator materials | SOMALOY 500TM |
Item | Fpm (mWb) | Tcog (Nm) | Tcog/Φpm |
---|---|---|---|
Unequal width claw pole | 0.510 | 0.012 | 0.0235 |
Two-step magnet skewing | 0.326 | 0.042 | 0.1288 |
Three-step magnet skewing | 0.329 | 0.012 | 0.0365 |
Herringbone magnet skewing | 0.327 | 0.025 | 0.0765 |
Magnet shifting | 0.331 | 0.021 | 0.0634 |
Claw pole dimensions | 0.479 | 0.032 | 0.0668 |
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Liu, C.; Lu, J.; Wang, Y.; Lei, G.; Zhu, J.; Guo, Y. Techniques for Reduction of the Cogging Torque in Claw Pole Machines with SMC Cores. Energies 2017, 10, 1541. https://doi.org/10.3390/en10101541
Liu C, Lu J, Wang Y, Lei G, Zhu J, Guo Y. Techniques for Reduction of the Cogging Torque in Claw Pole Machines with SMC Cores. Energies. 2017; 10(10):1541. https://doi.org/10.3390/en10101541
Chicago/Turabian StyleLiu, Chengcheng, Jiawei Lu, Youhua Wang, Gang Lei, Jianguo Zhu, and Youguang Guo. 2017. "Techniques for Reduction of the Cogging Torque in Claw Pole Machines with SMC Cores" Energies 10, no. 10: 1541. https://doi.org/10.3390/en10101541