This paper proposes a novel coaxial magnetic gear (CMG) with eccentric permanent magnet structure and unequal Halbach arrays for achieving sinusoidal air-gap flux density and high output torque. The proposed model has a high temperature superconducting (HTS) bulks to replace the epoxy resin in the conventional stationary ring. According to the Meissner effect and one-sided field, the HTS bulks could enhance the modulation effect. The permanent magnets (PMs) on the inner and outer rotors are distributed in Halbach array, in which the PMs are arranged regularly on the outer rotor, and the inner rotor is an eccentric structure. So the inner nonuniform air gap can be obtained. The proposed model with the pole pairs of 4 and 17 for the inner and outer rotors is established, and using finite element analysis (FEA) a calculated torque is up to 350.8 N.m. It is 2.16 times of the torque of conventional CMG.
2. Atallah, K. and D. Howe, "A novel high-performance magnetic gear," IEEE Trans. Magn., Vol. 37, No. 4, 2844-2846, Jul. 2001.
3. Padmanathan, P. and J. Z. Bird, "A continuously variable magnetic gear," IEEE Proc. IEMDC, 367-373, May 2013.
4. Fan, Y., L. Gu, Y. Luo, X. Han, and M. Cheng, "Investigation of a new flux-modulated permanent magnet brushless motor for EVs," The Scientific World Journal, Vol. 2014, Art. No. 540797, Apr. 2014.
5. Du, Y., K. T. Chau, and M. Cheng, "A linear stator permanent magnet vernier HTS machine for wave energy conversion," IEEE Trans. Appl. Supercond., Vol. 22, No. 3, Art. No. 5202505, Jun. 2012.
6. Frank, N. W., S. Pakdelian, and H. A. Toliyat, "Passive suppression of transient oscillations in the concentric planetary magnetic gear," IEEE Trans. Energy Convers., Vol. 26, No. 3, 933-939, Sep. 2011.
7. Uppalapati, K. K., J. Z. Bird, and J. Wright, "A magnetic gearbox with an active region torque density of 239 Nm/L," IEEE Energy Conversion Congress and Exposition, 1423-1428, 2014.
8. Jian, L., K. Chau, W. Li, and J. Li, "A novel coaxial magnetic gear using bulk HTS for industrial applications," IEEE Trans. Appl. Supercond., Vol. 20, No. 3, 981-984, Jun. 2010.
9. Cansiz, A. and E. Akyerden, "The use of high temperature superconductor bulk in a co-axial magnetic gear," Cryogenics, Vol. 98, 80-86, 2019.
10. Liu, C., H. Zhu, and R. Dong, "Linear magnetic gear with HTS bulks for wave energy conversion," IET Renew. Power Gen., Vol. 13, No. 13, 2430-2434, 2019.
11. Campbell, A., "A superconducting magnetic gear," Supercond. Sci. Technol., Vol. 29, No. 5, 054008, 2016.
12. Yin, X., Y. Fang, and P. Pfister, "A novel single-PM-array magnetic gear with HTS bulks," IEEE Trans. Appl. Supercond., Vol. 27, No. 4, ID. 5202705, Jun. 2017.