jpcs Journal of Physics: Conference Series J. Phys.: Conf. Ser. 1742-6588 1742-6596 IOP Publishing JPCS_1559_1_012136 10.1088/1742-6596/1559/1/012136 J15591136 Paper Effect of HTS stack sectioning on pulse magnetization efficiency in a motor Smara A 1 Climante-Alarcon V 1 Mineev N 1 Tomkow L 1 Glowski B A 1 2 Department of Materials Science and Metallurgy, University of Cambridge, CB3 0FS, Cambridge, UK Institute of Power Engineering, 01-330 Warsaw, Poland 06 2020 01 06 2020 1559 1 012136 Published under licence by IOP Publishing Ltd 2020 Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Abstract

Stacks of HTS superconductors can be magnetized and used as a surface mounted magnet for electrical machines. Pulse field magnetization is considered as a practical method; however, the amplitude of the pulse can be limited in an electrical motor which results in an under-saturated stack with the superconducting currents penetrating only a part of it making the magnetization less efficient. A solution to this problem could be sectioning the stack along its width enabling effective penetration of the superconducting currents. In this paper we investigate the effect of sectioning of HTS surface mounted stacks on the efficiency of pulse magnetization method in trapping the flux using low pulsing field. It is shown that the sectioning of wide stacks into several narrower parts results in a higher trapped flux at low pulses. Experimental measurements are performed on a lab-scale motor to validate the theoretical analysis.