Topological Shape Optimization of Permanent Magnet in Voice Coil Motor Using Level Set Method

• Published in: IEEE transactions on magnetics Vol. 48; no. 2; pp. 931 - 934
• Main Authors: Lee, Jangwon, Wang, Semyung
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01.02.2012; Institute of Electrical and Electronics Engineers
• Subjects: Coils; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Level set method; Magnetic domains; Materials science; nonlinear ferromagnetic material; Optimization; Other topics in materials science; permanent magnet; Permanent magnets; Physics; Saturation magnetization; Steel; Topology; topology optimization; voice coil motor; Coils; permanent magnet; nonlinear ferromagnetic material; Ferromagnetic materials; Permanent magnets; Magnetic materials; topology optimization; Level set method; Engines; Magnetic properties; voice coil motor
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/TMAG.2011.2173922

In this paper, a voice coil motor is optimized using the single-phase and the multi-phase level set method, and the magnetic saturation effect is considered in the optimization. The normal velocities on the moving boundaries are calculated by a design sensitivity analysis (DSA) using the adjoint variable method (AVM). In the first numerical example using a C-core actuator, the level set based optimization is compared with conventional topology optimization. In the second numerical example of the voice coil motor, optimizations using the single-phase and the multi-phase level set method are performed to maximize the Lorentz force on the moving coil by means of the optimal shapes of the permanent magnet and the ferromagnetic material in a design domain.