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Identifying manufacturing induced rotor and stator misalignment in brushless permanent magnet motors

Thiele, Mark, Heins, Greg and Patterson, Dean (2014). Identifying manufacturing induced rotor and stator misalignment in brushless permanent magnet motors. In: 24th International Conference on Electrical Machines (ICEM 2014), Berlin, Germany, 2-5 September 2014.

Document type: Conference Paper
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IRMA ID 75039815xPUB569
Author Thiele, Mark
Heins, Greg
Patterson, Dean
Title Identifying manufacturing induced rotor and stator misalignment in brushless permanent magnet motors
Conference Name 24th International Conference on Electrical Machines (ICEM 2014)
Conference Location Berlin, Germany
Conference Dates 2-5 September 2014
Conference Publication Title Proceedings 2014 International Conference on Electrical Machines, ICEM 2014
Publisher Institute of Electrical and Electronics Engineers (IEEE)
Publication Year 2014
Start Page 2728
End Page 2733
Total Pages 6
HERDC Category E1 - Conference Publication (DIISR)
Abstract Cogging torque in fractional pitch PMSM is minimized when manufacturing induced errors are also minimized. This paper investigates additional cogging torque harmonics resulting from misalignment of the rotor and stator caused by assembly and manufacturing tolerances in an axial flux, fractional pitch PMSM. A hybrid analytical / FEA method utilizing superposition of a pole transition over a single stator slot is developed to predict the effect on cogging torque of angular misalignment in combination with pole and slot placement inaccuracies. This work extends on that previously published by inducing varying degrees of assembly misalignment of the stator and rotor to determine the effect on cogging torque waveforms. Experimental data is presented supporting the analytical data indicating that static angular misalignment produces sidebands about the rotor affected harmonics and dynamic angular misalignment creates sidebands around the stator affected harmonic. There is good agreement between the analytical method, FEA and measured experimental data.
Additional Notes Published in: Electrical Machines (ICEM), 2014 International Conference on
 
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Created: Wed, 19 Aug 2015, 16:39:11 CST