Additional Cogging Torque Components in Permanent-Magnet Motors Due to Manufacturing Imperfections
- Resource Type
- Periodical
- Authors
- Gasparin, L.; Cernigoj, A.; Markic, S.; Fiser, R.
- Source
- IEEE Transactions on Magnetics IEEE Trans. Magn. Magnetics, IEEE Transactions on. 45(3):1210-1213 Mar, 2009
- Subject
- Fields, Waves and Electromagnetics
Forging
Torque
Permanent magnet motors
Assembly
Magnetic flux
Rotors
Stators
Virtual manufacturing
Magnetic analysis
Magnetic separation
Cogging torque
magnetic analysis
manufacturing issues
permanent-magnet machines
- Language
- ISSN
- 0018-9464
1941-0069
This paper presents issues for reducing cogging torque of permanent-magnet motors. When proper methods are employed, it is theoretically possible to minimize its level or even to eliminate it. FFT analyses of cogging torque in mass-produced motors have shown additional harmonic components, which are in tight correlation with assembly tolerances and/or permanent-magnet imperfections. Finite element method has been used to study the sensitivity of different motor models relative to manufacturing tolerances and to determine rules for detecting imperfections in mass-production.