A servo system moves a mass from one position to another as quickly as possible. A servo motor requires very high short term torque and should be able to accelerate and decelerate very quickly. In other words, a servomotor should be able to produce high torque and its inertia must be low. The paper concentrates on the mechanical design optimization of the rotor assembly, given the existing physical constraints of the prototype motor. The existing physical constraints include the rotor dimensions. To reduce the cogging torque, the different magnet shape and skew were manufactured and tested. Using the above design the ratio of torque to the moment of inertia of the rotor goes to its minimum amount. As a result, the acceleration and deceleration of the system will be improved.

Issue Section:
Technical Papers
Keywords:
servomotors, permanent magnet motors, torque, optimisation, machine testing
Topics:
Engines, Magnets, Motors, Optimization, Rotors, Servomotors, Torque, Permanent magnets, Shapes
1.
Wijenayake, A. H., Baily, J. M., and McCleer, P. J., 1995, “Design Optimisation of an Axial Gap Permanent Magnet Brushless DC Motor for Electric Vehicle Application,” IEEE, 1, 685–692, industry application conferences 1995.
2.
Rosu, M., Arkkio, A., Jokinen, T., Mantere, J., and Westerlund, J., 1995,“Demagnetisation state of permanent magnets in jarge output power permanent Magnet Synchronous Motor,” IEEE, pp. 776–778.
3.
Morandini, R., 2000. “Mechanical optimization of servo motor,” BE thesis, Faculty of Engineering,. The University of Wollongong, Australia, p. 55.
4.
Moosavian, S. A., and Basu, 2000, “A new mechanical design of a servo motor,” Mechatronics and Machine Vision, edited by J. Billingseley, University of Southern Queensland, Research Studies LTD; Baldock, Hertfordshire, England.
Copyright © 2005
 by ASME
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