Cogging torque: Difference between revisions
m v2.03b - Bot T20 CW#61 - WP:WCW project (Reference before punctuation) |
Tom.Reding (talk | contribs) m Category:CS1 errors: deprecated parameters (last-author-amp=y/yes → name-list-style=amp; etc.) |
||
| Line 6: | Line 6: | ||
* Skewing stator stack or magnets |
* Skewing stator stack or magnets |
||
* Using fractional slots per pole |
* Using fractional slots per pole |
||
* Optimizing the magnet pole arc or width<ref name=Cogging_Torque_Opt>{{cite journal |title=Cogging Torque Shape Optimization of an Integrated Generator for Electromechanical Energy Harvesting |author1=Flankl, Michael |author2=Tüysüz, Arda |author3=Kolar, Johann W. | |
* Optimizing the magnet pole arc or width<ref name=Cogging_Torque_Opt>{{cite journal |title=Cogging Torque Shape Optimization of an Integrated Generator for Electromechanical Energy Harvesting |author1=Flankl, Michael |author2=Tüysüz, Arda |author3=Kolar, Johann W. |name-list-style=amp |journal=IEEE Transactions on Industrial Electronics |date=December 2017 |doi=10.1109/TIE.2017.2733441 |url=https://www.pes-publications.ee.ethz.ch/uploads/tx_ethpublications/24_Cogging_Torque_Shape_Optimization_of_an_Integrated_Generator_for_Electromechanical_Energy_Harvesting_Flankl.pdf |access-date=2018-02-01 |archive-url=https://web.archive.org/web/20180202071655/https://www.pes-publications.ee.ethz.ch/uploads/tx_ethpublications/24_Cogging_Torque_Shape_Optimization_of_an_Integrated_Generator_for_Electromechanical_Energy_Harvesting_Flankl.pdf |archive-date=2018-02-02 |url-status=dead }}</ref> |
||
Almost all the techniques used against cogging torque also reduce the motor [[counter-electromotive force]] and so reduce the resultant running torque. |
Almost all the techniques used against cogging torque also reduce the motor [[counter-electromotive force]] and so reduce the resultant running torque. |
||
Revision as of 14:41, 13 October 2020
Cogging torque of electrical motors is the torque due to the interaction between the permanent magnets of the rotor and the stator slots of a Permanent Magnet (PM) machine. It is also known as detent or 'no-current' torque. This torque is position dependent and its periodicity per revolution depends on the number of magnetic poles and the number of teeth on the stator. Cogging torque is an undesirable component for the operation of such a motor. It is especially prominent at lower speeds, with the symptom of jerkiness. Cogging torque results in torque as well as speed ripple; however, at high speed the motor moment of inertia filters out the effect of cogging torque.
Reducing the cogging torque
A summary of techniques used for reducing cogging torque:[1]
- Skewing stator stack or magnets
- Using fractional slots per pole
- Optimizing the magnet pole arc or width[2]
Almost all the techniques used against cogging torque also reduce the motor counter-electromotive force and so reduce the resultant running torque.
A slotless and coreless permanent magnet motor does not have any cogging torque.
Footnotes and References
- ^ "Cogging Torque Reduction in a Permanent Magnet Wind Turbine Generator" (PDF).
- ^ Flankl, Michael; Tüysüz, Arda & Kolar, Johann W. (December 2017). "Cogging Torque Shape Optimization of an Integrated Generator for Electromechanical Energy Harvesting" (PDF). IEEE Transactions on Industrial Electronics. doi:10.1109/TIE.2017.2733441. Archived from the original (PDF) on 2018-02-02. Retrieved 2018-02-01.
See also
External links
- [D. Hanselman] Brushless Permanent Magnet Motor Design at the Wayback Machine (archived July 19, 2011)