Abstract
Bearingless motor technology offers an integrated and compact alternative to active magnetic bearings for developing contact-free and oil-free industrial compressor systems. These systems require high speed motors designed for significant power levels. This paper considers the optimal design of a 50kW, 30,000 r/min bearingless motor. This design is based around a topology with a fractional slot-concentrated winding and a surface mount permanent magnet motor (the popular 4-pole, 6-slot design), making it a practical and potentially cost-effective design to manufacture. A parallel no voltage combined winding is designed so that the same coils that create torque can also be used to create suspension forces. The rotor magnets are retained via a carbon fiber banding, which is designed within the proposed optimization process. A multi-physics design framework is developed based around the differential evolution algorithm that considers both the electromagnetic design and the structural integrity of the rotor. Design metrics unique to bearingless motors are described and implemented. The final design achieves a maximum efficiency of nearly 96%, a safety factor of approximately 2 in the rotor structural analysis, and is able to support the rotor weight with only 2.5% of the rated armature current.
Original language | English (US) |
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Title of host publication | 2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018 |
Publisher | Institute of Electrical and Electronics Engineers Inc. |
Pages | 4411-4418 |
Number of pages | 8 |
ISBN (Electronic) | 9781479973118 |
DOIs | |
State | Published - Dec 3 2018 |
Externally published | Yes |
Event | 10th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2018 - Portland, United States Duration: Sep 23 2018 → Sep 27 2018 |
Publication series
Name | 2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018 |
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Other
Other | 10th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2018 |
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Country/Territory | United States |
City | Portland |
Period | 9/23/18 → 9/27/18 |
Bibliographical note
Publisher Copyright:© 2018 IEEE.
Keywords
- Bearingless motor
- Differential evolution
- Magnetic levitation
- Multi-Physics
- Optimization
- Self-bearing motor