Temperature Influence of NiFe Steel Laminations on the Characteristics of Small Slotless Permanent Magnet Machines
2013 (English)In: IEEE transactions on magnetics, ISSN 0018-9464, E-ISSN 1941-0069, Vol. 49, no 7, 4064-4067 p.Article in journal (Refereed) Published
High performance electrical machines can operate at temperatures of 100 degrees C and beyond in rotor and stator cores. However, magnetic properties are generally measured at room temperatures around 23 degrees C to 25 degrees C according to the standards, even if it is known that the magnetization of some materials is substantially influenced by increasing temperatures. This paper investigates the thermal influence on the magnetic properties and iron losses in the stator cores of small slotless permanent magnet synchronous machines (PMSMs). The stator stack is made of thin nickel iron (NiFe) lamination sheets. Magnetic measurements of the stator core are conducted for different frequencies and flux densities at several temperatures between 25 degrees C and 105 degrees C. The obtained measurement data is afterwards used in finite element method (FEM) simulations to investigate the influence of the magnetic property change on the machine performance. For the PMSM in consideration, the FEM simulations show that an increased stator core temperature reduces the electromagnetic torque considerably; approximately 1/3 of the torque reduction due to increased rotor magnet and stator core temperatures (from 25 degrees C to 100 degrees C) can be attributed to the increased stator core temperature.
Place, publisher, year, edition, pages
2013. Vol. 49, no 7, 4064-4067 p.
Iron alloys, loss measurement, magnetic hysteresis, magnetic losses, magnetic materials, permanent magnet machines, soft magnetic materials, thermal effects
Other Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-122207DOI: 10.1109/TMAG.2013.2255026ISI: 000322483200251ScopusID: 2-s2.0-84880824255OAI: oai:DiVA.org:kth-122207DiVA: diva2:621354
QC 201309122013-05-142013-05-142013-12-03Bibliographically approved