A topology optimized switchable permanent magnet system

• Published in: Journal of magnetism and magnetic materials 2018-11, Vol.465, p.106-113
• Main Authors: Bjørk, R., Insinga, A.R.
• Format: Article
• Language: English
• Subjects: Air gaps; Cylinders; Flux density; Halbach cylinder; Inserts; Iron; Magnetic field; Magnetic fields; Optimization; Permanent magnet flux sources; Permanent magnets; Switchable field source; Topology; Topology optimization
• ISSN: 0304-8853; 1873-4766
• DOI: 10.1016/j.jmmm.2018.05.076

•A switchable permanent magnet system is designed using topology optimization.•The shape of rotatable iron inserts is determined using topology optimization.•The performance of topology optimized inserts is compared to classical pole pieces.•The topology optimized inserts increase the field difference by a factor of 1.29.•The shape of the topology optimized iron pieces can be approximated by a parabola. The design of a magnetic field source that can switch from a high field to a low field configuration by rotation by 90° of a set of iron pieces is investigated using topology optimization. A Halbach cylinder is considered as the magnetic field source and iron inserts are placed in the air gap of the Halbach cylinder. The ideal shape of these iron inserts is determined as function of the field generated by the Halbach cylinder and as function of the size of the iron segments. The topology optimized structures are parabolic shaped pieces and have a difference in flux density between the high and low positions that is on average 1.29 times higher than optimized regular pole pieces. The maximum increase is a factor of 2.08 times higher than the regular pole pieces.