TY - GEN
T1 - Rotordynamic assessment for an inside out, high speed permanent magnet synchronous motor
AU - Yu, Yangxue
AU - Sirimanna, Samith
AU - Haran, Kiruba
AU - Clydesdale, Thomas
AU - Sharos, Brad
AU - Lubell, Daniel
AU - Murphy, Brian
N1 - Funding Information:
This work is being performed under cooperative agreement number NNX14AL79A with the NASA Glen Research Center under Technical Monitor Andrew Provenza. The authors would like to thank Collins Aerospace for providing the facility and equipment to conduct the ping test as well as ping test data post-processing and XLRotor model correlation review.
Publisher Copyright:
© 2020 IEEE.
PY - 2020/8/23
Y1 - 2020/8/23
N2 - High speed and high rotor tip-speed, in particular, combined with high magnetic and electrical loading, are key enablers for obtaining high specific power in electric machines. The rotor described in this paper pushes the tip speed to about 80% of the speed of sound. An outer rotor design with a carbon-fiber retaining ring on the outer diameter (OD) was chosen to maintain high magnetic loading in the airgap while ensuring structural integrity at high speed. To achieve manufactural feasibility, a cantilevered rotor structure was proposed to suspend the rotor around the stator. This architecture introduces significant rotordynamic challenges, one of which is the 'trunnion effect, ' a rotordynamic effect uncommon in traditional electric machines. This effect was identified when a discrepancy was observed during a rotor test and a root-cause analysis was performed to explain it. The original rotor dynamic model was modified to include this effect, and verified through a ping test. The trunnion effect, which significantly reduces the critical speeds, can be offset by selecting appropriate dimensions for the rotor end plate using the revised model. Thus, even in the presence of this effect, the proposed unconventional motor topology is confirmed to function reliably.
AB - High speed and high rotor tip-speed, in particular, combined with high magnetic and electrical loading, are key enablers for obtaining high specific power in electric machines. The rotor described in this paper pushes the tip speed to about 80% of the speed of sound. An outer rotor design with a carbon-fiber retaining ring on the outer diameter (OD) was chosen to maintain high magnetic loading in the airgap while ensuring structural integrity at high speed. To achieve manufactural feasibility, a cantilevered rotor structure was proposed to suspend the rotor around the stator. This architecture introduces significant rotordynamic challenges, one of which is the 'trunnion effect, ' a rotordynamic effect uncommon in traditional electric machines. This effect was identified when a discrepancy was observed during a rotor test and a root-cause analysis was performed to explain it. The original rotor dynamic model was modified to include this effect, and verified through a ping test. The trunnion effect, which significantly reduces the critical speeds, can be offset by selecting appropriate dimensions for the rotor end plate using the revised model. Thus, even in the presence of this effect, the proposed unconventional motor topology is confirmed to function reliably.
KW - Permanent magnet motor
KW - Rotating machine mechanical factors
KW - Testing
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U2 - 10.1109/ICEM49940.2020.9270695
DO - 10.1109/ICEM49940.2020.9270695
M3 - Conference contribution
AN - SCOPUS:85098668841
T3 - Proceedings - 2020 International Conference on Electrical Machines, ICEM 2020
SP - 529
EP - 535
BT - Proceedings - 2020 International Conference on Electrical Machines, ICEM 2020
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2020 International Conference on Electrical Machines, ICEM 2020
Y2 - 23 August 2020 through 26 August 2020
ER -