Experimental verification of an angle-sensorless control scheme for bearingless permanent magnet machines

Wellerdieck, Tobias; Nußbaumer, Thomas; Kolar, Johann W.

doi:10.1299/mej.17-00003

Mechanical Engineering Journal

2017

DOI: 10.1299/mej.17-00003

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Experimental verification of an angle-sensorless control scheme for bearingless permanent magnet machines

Tobias Wellerdieck

Thomas Nußbaumer

Johann W. Kolar

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Cited by 2 publications

References 12 publications

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Temperature drift at low temperatures and development of bearingless motor

KATO,

KOMORI

2023

Journal of the Japan Society of Applied Electromagnetics and Me

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This paper proposes an axial type bearingless motor using zero power control as a low-cost magnetic bearing assuming temperature drift at low temperatures. A bearingless motor is a motor that functions as a bearing and can support the rotor without contact. The proposed bearingless motor is a one-degree-of-freedom axial type bearingless motor that is actively controlled only in the axial direction of the rotor using an eddy-current displacement sensor. Other degrees of freedom are passively controlled with permanent magnet bearings. In addition, zero-power control is used to solve the problem of temperature drift, in which the output of the eddy-current displacement sensor changes depending on the temperature. As a result, a bearingless motor with only one eddy current displacement sensor and requiring no sensor calibration from room temperature to liquid nitrogen temperature has been developed, and its drive has been verified by experiments using liquid nitrogen.

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Temperature drift at low temperatures and development of bearingless motor

KATO,

KOMORI

2023

Journal of the Japan Society of Applied Electromagnetics and Me

View full text Add to dashboard Cite

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Development of one-axis controlled bearingless motor and its application to a centrifugal pump for extremely low temperature

Kato¹,

Komori²,

Asami³

et al. 2020

JAE

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In this paper, a centrifugal pump for for extremely low temperature was fabricated and evaluated by experiments in liquid nitrogen. The pump is using a bearingless motor and permanent magnet bearings to levitate and rotate the rotor without lubricating oil. The difference from the conventional study is that a one-axis controlled bearingless motor is used to reduce the magnetic bearing cost and that the bearings are installed in the liquid to eliminate a shaft-seal. Stable levitation and rotation of the rotor were confirmed in the rotation and pump experiments in liquid nitrogen. In pump experiment, the flow rate of liquid nitrogen was measured at 1 cm in a pumping height. The maximum flow rate was 1.3 L/min when the rotation speed is 1,800 rpm.

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Experimental verification of an angle-sensorless control scheme for bearingless permanent magnet machines

Cited by 2 publications

References 12 publications

Temperature drift at low temperatures and development of bearingless motor

Temperature drift at low temperatures and development of bearingless motor

Development of one-axis controlled bearingless motor and its application to a centrifugal pump for extremely low temperature

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