A1 Journal article (refereed), original research

Modeling of a 30 000 rpm Bearingless SPM Drive with Loss and Thermal Analyses for a 0.5 MW High-Temperature Heat Pump

Open Access hybrid publication

Publication Details
Authors: Kepsu Daria, Jastrzebski Rafal Piotr, Pyrhönen Olli
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Publication year: 2021
Language: English
Related journal or series: IEEE Transactions on Industry Applications
ISSN: 0093-9994
eISSN: 1939-9367
JUFO level of this publication: 2
Open Access: Open Access hybrid publication


The paper addresses coupled loss and thermal
analyses of a bearingless drive with an operating speed range of 17 000–32 000
rpm. The drive is a part of a high-temperature heat pump system integrated in a
high-speed compressor. This drive system comprises two bearingless motor units and
an axial active magnetic bearing (AMB). The drive can be positioned horizontally
or vertically. The positioning is directly related to the force necessary to raise
and suspend the rotor. Furthermore, the amplitude of the suspension current has
a significant effect on the motor winding and iron losses. The iron losses, eddy
current losses in the magnets and losses in the bandage are investigated by 3D
and 2D Finite Element Analysis (FEA). The influence of segmentation of the
magnets on losses is analyzed. Friction losses of the coolant are calculated
analytically, and all the losses obtained from the electromagnetic analysis are
represented as distributed heat sources and coupled with the 3D thermal field
analysis. The temperature fields are modelled under different motoring and
suspension current conditions and evaluated for horizontal and vertical
positions of the motor. As a precaution, demagnetization of the magnets is also

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Last updated on 2021-16-06 at 07:31