Development of a cryogenic induction motor for use with a superconducting magnetic bearing

Tomotake Matsumura; Shaul Hanany; John R. Hull; Bradley Johnson; Terry J Jones; Paul K. Oxley

doi:10.1016/j.physc.2005.02.075

Development of a cryogenic induction motor for use with a superconducting magnetic bearing

Tomotake Matsumura, Shaul Hanany, John R. Hull, Bradley Johnson, Terry J Jones, Paul K. Oxley

Research output: Contribution to journal › Conference article › peer-review

4 Scopus citations

Abstract

We have constructed a cryogenic induction motor to turn the rotor of a superconducting magnetic bearing (SMB). Both the motor and the SMB are operated at liquid He temperatures. We give a model for the motor and present measurements of its operation. The rotation speed is very stable. Over 8 h it shows an RMS variation of only 0.005 Hz from a mean of 2 Hz. The speed variation within one period of rotation is 3% ± 1% implying that the angular position of the rotor can be determined to an accuracy of 1° for all angles of rotation even if angular position is encoded only once every period. Friction and heat dissipation in this motor is dominated by eddy currents. We discuss the application of the motor to astrophysical polarimetry.

Original language	English (US)
Pages (from-to)	746-751
Number of pages	6
Journal	Physica C: Superconductivity and its applications
Volume	426-431
Issue number	I
DOIs	https://doi.org/10.1016/j.physc.2005.02.075
State	Published - Oct 1 2005
Event	Proceedings of the 17th International Symposium on Superconductivity (ISS 2004) Advances in Supeconductivity - Duration: Nov 23 2004 → Nov 25 2004

Keywords

Astrophysical polarimeter
Induction motor
Superconducting magnetic bearings

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10.1016/j.physc.2005.02.075

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title = "Development of a cryogenic induction motor for use with a superconducting magnetic bearing",

abstract = "We have constructed a cryogenic induction motor to turn the rotor of a superconducting magnetic bearing (SMB). Both the motor and the SMB are operated at liquid He temperatures. We give a model for the motor and present measurements of its operation. The rotation speed is very stable. Over 8 h it shows an RMS variation of only 0.005 Hz from a mean of 2 Hz. The speed variation within one period of rotation is 3% ± 1% implying that the angular position of the rotor can be determined to an accuracy of 1° for all angles of rotation even if angular position is encoded only once every period. Friction and heat dissipation in this motor is dominated by eddy currents. We discuss the application of the motor to astrophysical polarimetry.",

keywords = "Astrophysical polarimeter, Induction motor, Superconducting magnetic bearings",

author = "Tomotake Matsumura and Shaul Hanany and Hull, {John R.} and Bradley Johnson and Jones, {Terry J} and Oxley, {Paul K.}",

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note = "Proceedings of the 17th International Symposium on Superconductivity (ISS 2004) Advances in Supeconductivity ; Conference date: 23-11-2004 Through 25-11-2004",

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TY - JOUR

T1 - Development of a cryogenic induction motor for use with a superconducting magnetic bearing

AU - Matsumura, Tomotake

AU - Hanany, Shaul

AU - Hull, John R.

AU - Johnson, Bradley

AU - Jones, Terry J

AU - Oxley, Paul K.

PY - 2005/10/1

Y1 - 2005/10/1

N2 - We have constructed a cryogenic induction motor to turn the rotor of a superconducting magnetic bearing (SMB). Both the motor and the SMB are operated at liquid He temperatures. We give a model for the motor and present measurements of its operation. The rotation speed is very stable. Over 8 h it shows an RMS variation of only 0.005 Hz from a mean of 2 Hz. The speed variation within one period of rotation is 3% ± 1% implying that the angular position of the rotor can be determined to an accuracy of 1° for all angles of rotation even if angular position is encoded only once every period. Friction and heat dissipation in this motor is dominated by eddy currents. We discuss the application of the motor to astrophysical polarimetry.

AB - We have constructed a cryogenic induction motor to turn the rotor of a superconducting magnetic bearing (SMB). Both the motor and the SMB are operated at liquid He temperatures. We give a model for the motor and present measurements of its operation. The rotation speed is very stable. Over 8 h it shows an RMS variation of only 0.005 Hz from a mean of 2 Hz. The speed variation within one period of rotation is 3% ± 1% implying that the angular position of the rotor can be determined to an accuracy of 1° for all angles of rotation even if angular position is encoded only once every period. Friction and heat dissipation in this motor is dominated by eddy currents. We discuss the application of the motor to astrophysical polarimetry.

KW - Astrophysical polarimeter

KW - Induction motor

KW - Superconducting magnetic bearings

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DO - 10.1016/j.physc.2005.02.075

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SN - 0921-4534

VL - 426-431

SP - 746

EP - 751

JO - Physica C: Superconductivity and its applications

JF - Physica C: Superconductivity and its applications

IS - I

T2 - Proceedings of the 17th International Symposium on Superconductivity (ISS 2004) Advances in Supeconductivity

Y2 - 23 November 2004 through 25 November 2004

ER -

Development of a cryogenic induction motor for use with a superconducting magnetic bearing

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