Computation of 3D Magnetic Field Distribution in Long-Lifetime Electromagnetic Actuators

This paper involves the computation of 3D magnetic fields in high-performance, long-lifetime solenoid actuators by finite element (FE) modeling. Operating at frequencies between 150-300 Hz, these actuators are unique in terms of the large force they produce (8-15 N) and their very long lifetime (over 5 billion continuous duty cycles). Their magnetic circuit typically operates at saturation and, because of the compact dimensions, the 3D nature of the field distribution needs to be taken into account for their design. Results are presented in terms of the effects of design parameters on saturation and force calculation. Some of these results are compared with those obtained from 2D modeling to assess the 3D effects