Design and Analysis of Zero Cogging Brushless DC Motor for Spacecraft Applications

Praveen R.P.; Ravichandran M.H.; V. T. Sadasivan Achari; Jagathy Raj V. P.; G. Madhu; G.R. Bindu

doi:10.37936/ecti-eec.201191.172327

Authors

Praveen R.P. Cochin University of Science and Technology
Ravichandran M.H. ISRO Inertial Systems Unit
V. T. Sadasivan Achari ISRO Inertial Systems Unit
Jagathy Raj V. P. Cochin University of Science and Technology
G. Madhu Cochin University of Science and Technology
G.R. Bindu Selection Grade Lecturer with the Electrical Department of College of Engineering

DOI:

https://doi.org/10.37936/ecti-eec.201191.172327

Keywords:

Brushless DC Motor, Slotted, Slotless, Halbach, Torque, Cogging, Space Application

Abstract

This paper presents the optimal design of a surface mounted permanent magnet Brushless DC motor (PMBLDC) meant for spacecraft applications. The spacecraft applications requires the choice of a torques motor with high torque density, minimum cogging torque, better positional stability and high torque to inertia ratio. Performance of two types of machine con¯gurations viz Slotted PMBLDC and Slotless PMBLDC with halbach array are compared with the help of analytical and FE methods. It is found that unlike a Slotted PMBLDC motor, the Slotless type with halbach array develops zero cogging torque without reduction in the developed torque. Moreover, the machine being coreless provides high torque to inertia ratio and zero magnetic stiction.

References

[1] "Selection of Electric Motors for Aerospace Applications," NASA Document on Preferred Reliability Practices, Practice No. PD-ED-1229, pp. 1-6.

[2] Praveen R.P., Ravichandran M.H et.al, "Design and Finite Element Analysis of Hybrid Stepper motor for Spacecraft Applications," Proceedings of IEEE International Electric Machines and Drives Conference (IEMDC), May. 2009, pp.1051 -1057.

[3] Praveen R.P. ,Ravichandran M.H et.al, "Design and Analysis of a Hybrid Stepper motor for Actuating the gimbal of Control Moment Gyroscope ," International Review of Electrical Engineering (IREE) , Vol.5, No.4, Part A, August. 2010.

[4] T. Kenjo and S. Nagamori, "Permanent Magnet and Brushless DC Motors," Clarendon Press, Oxford, 1985.

[5] T. J. E. Miller, "Brushless Permanent Magnet and Reluctance Motor Drives," Clarendon Press, Oxford, 1989.

[6] F. Dubas and C. Espanet, "Analytical Solution of the magnetic ¯eld in permanent magnet motors taking in to account slotting effect: No-load vector potential and flux density calculation," IEEE Transactions on Magnetics., Vol. 45, No. 5, pp. 2097-2109, May. 2009.

[7] T. Li and G. Slemon, "Reduction of Cogging torque in permanent magnet motors ," IEEE Trans. Magnetics, Vol. 24, No. 6, pp. 2901- 2903, November 1988.

[8] M. Dai, A. Keyhani and T.Sebastin, "Torque Ripple Analysis of a PM Brushless DC Motor using ¯nite Element Method," IEEE Trans. Energy Conversion, Vol 19, No. 1, pp. 40-45, March 2004.

[9] Ravichandran M.H, Sadasivan Achari V.T., et.al; "Remedial strategies for the minimization of cogging Torque in PMBDC motor possessing material saturation," Proceedings of IEEE International PEDES 2006 Conference, Dec. 2006, pp:1 -4.

[10] Praveen R.P. ,Ravichandran M.H,et.al; "Design and Analysis of Zero Cogging Brushless DC motor for Spacecraft Applications," Proceedings of IEEE International ECTI-CON 2010 Conference , May. 2010, pp. 254 -258.

[11] Praveen R.P., Ravichandran M.H et.al; "Design and Analysis of Enclosed Rotor Halbach Array Brushless DC Motor for Spacecraft Applications," Proceedings of IEEE International Conference on Electrical Machines (ICEM), September. 2010.

[12] Z. P. Zia and Z. Q. Zhu, "Analytical Magnetic Field Analysis of Halbach Permanent magnet machines," IEEE Transactions on Magnetics, Vol.40, No.4, pp.1864-1872, June 2004.

[13] S. M. Jang and S.S. Jeong, "Comparison of three types of PM Brushless machines for an electro-mechanical battery," IEEE Transactions on Magnetics, Vol.36, No.5, pp.3540-3543, September 2001.