Hysteresis Bearingless Slice Motors with Homopolar Flux-biasing
We present a new concept of bearingless slice motor that levitates and rotates a ring-shaped solid rotor. The rotor is made of a semi-hard magnetic material exhibiting magnetic hysteresis, such as D2 steel. The rotor is radially biased with a homopolar permanent-magnetic flux, on which the stator ca...
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| Format: | Article |
| Language: | en_US |
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Institute of Electrical and Electronics Engineers (IEEE)
2017
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| Online Access: | http://hdl.handle.net/1721.1/112356 https://orcid.org/0000-0001-5876-8854 https://orcid.org/0000-0001-5358-5450 |
| _version_ | 1826207521208008704 |
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| author | Gruber, Wolfgang Noh, Minkyun Trumper, David L |
| author2 | Massachusetts Institute of Technology. Department of Mechanical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Mechanical Engineering Gruber, Wolfgang Noh, Minkyun Trumper, David L |
| author_sort | Gruber, Wolfgang |
| collection | MIT |
| description | We present a new concept of bearingless slice motor that levitates and rotates a ring-shaped solid rotor. The rotor is made of a semi-hard magnetic material exhibiting magnetic hysteresis, such as D2 steel. The rotor is radially biased with a homopolar permanent-magnetic flux, on which the stator can superimpose two-pole flux to generate suspension forces. By regulating the suspension forces based on position feedback, the two radial rotor degrees of freedom are actively stabilized. The two tilting degrees of freedom and the axial translation are passively stable due to the reluctance forces from the bias flux. In addition, the stator can generate a torque by superimposing six-pole rotating flux, which drags the rotor via hysteresis coupling. This six-pole flux does not generate radial forces in conjunction with the homopolar flux or two-pole flux, and therefore the suspension force generation is in principle decoupled from the driving torque generation. We have developed a prototype system as a proof of concept. The stator has 12 teeth, each of which has a single-phase winding that is individually driven by a linear transconductance power amplifier. The system has four reflectivetype optical sensors to differentially measure the two radial degrees of freedom of the rotor. The suspension control loop is implemented such that the phase margin is 25° at the cross-over frequency of 110 Hz. The prototype system can levitate the rotor and drive it up to about 1730 r/min. The maximum driving torque is about 2.7 mNm. |
| first_indexed | 2024-09-23T13:50:51Z |
| format | Article |
| id | mit-1721.1/112356 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T13:50:51Z |
| publishDate | 2017 |
| publisher | Institute of Electrical and Electronics Engineers (IEEE) |
| record_format | dspace |
| spelling | mit-1721.1/1123562022-09-28T16:35:13Z Hysteresis Bearingless Slice Motors with Homopolar Flux-biasing Gruber, Wolfgang Noh, Minkyun Trumper, David L Massachusetts Institute of Technology. Department of Mechanical Engineering Trumper, David L. Noh, Minkyun Trumper, David L We present a new concept of bearingless slice motor that levitates and rotates a ring-shaped solid rotor. The rotor is made of a semi-hard magnetic material exhibiting magnetic hysteresis, such as D2 steel. The rotor is radially biased with a homopolar permanent-magnetic flux, on which the stator can superimpose two-pole flux to generate suspension forces. By regulating the suspension forces based on position feedback, the two radial rotor degrees of freedom are actively stabilized. The two tilting degrees of freedom and the axial translation are passively stable due to the reluctance forces from the bias flux. In addition, the stator can generate a torque by superimposing six-pole rotating flux, which drags the rotor via hysteresis coupling. This six-pole flux does not generate radial forces in conjunction with the homopolar flux or two-pole flux, and therefore the suspension force generation is in principle decoupled from the driving torque generation. We have developed a prototype system as a proof of concept. The stator has 12 teeth, each of which has a single-phase winding that is individually driven by a linear transconductance power amplifier. The system has four reflectivetype optical sensors to differentially measure the two radial degrees of freedom of the rotor. The suspension control loop is implemented such that the phase margin is 25° at the cross-over frequency of 110 Hz. The prototype system can levitate the rotor and drive it up to about 1730 r/min. The maximum driving torque is about 2.7 mNm. 2017-12-05T16:13:02Z 2017-12-05T16:13:02Z 2017-08 Article http://purl.org/eprint/type/ConferencePaper 1083-4435 1941-014X http://hdl.handle.net/1721.1/112356 Noh, Minkyun et al. “Hysteresis Bearingless Slice Motors with Homopolar Flux-Biasing.” IEEE/ASME Transactions on Mechatronics 22, 5 (August 2017): 2308 - 2318 © 2017 Institute of Electrical and Electronics Engineers (IEEE) https://orcid.org/0000-0001-5876-8854 https://orcid.org/0000-0001-5358-5450 en_US http://dx.doi.org/10.1109/TMECH.2017.2740429 IEEE/ASME Transactions on Mechatronics Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf Institute of Electrical and Electronics Engineers (IEEE) David L. Trumper |
| spellingShingle | Gruber, Wolfgang Noh, Minkyun Trumper, David L Hysteresis Bearingless Slice Motors with Homopolar Flux-biasing |
| title | Hysteresis Bearingless Slice Motors with Homopolar Flux-biasing |
| title_full | Hysteresis Bearingless Slice Motors with Homopolar Flux-biasing |
| title_fullStr | Hysteresis Bearingless Slice Motors with Homopolar Flux-biasing |
| title_full_unstemmed | Hysteresis Bearingless Slice Motors with Homopolar Flux-biasing |
| title_short | Hysteresis Bearingless Slice Motors with Homopolar Flux-biasing |
| title_sort | hysteresis bearingless slice motors with homopolar flux biasing |
| url | http://hdl.handle.net/1721.1/112356 https://orcid.org/0000-0001-5876-8854 https://orcid.org/0000-0001-5358-5450 |
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