Decoupled Modeling in a Multifrequency Domain: Integration of Actuation and Power Transfer in One Device

A novel topology of a moving-coil, tubular permanent magnet linear motor with an integrated coaxial transformer is introduced in this paper. The topology is able to continuously transfer 800 W of power and generate at least 250 N of force. The isotropic, soft-magnetic composite core of the topology simultaneously functions as the flux guide of a high-frequency (5-10 kHz) transformer core and the low-frequency (<; 100 Hz) motor core. The magnetic fields of the motor and the transformer have an orthogonal mutual orientation to minimize cross-coupling effects between both functionalities. The magnetic behavior of the complex, 3-D, electromagnetic problem, that simultaneously operates in two frequency domains, is analyzed by means of decoupled Fourier models. The Fourier models are, first, applied to identify the electromagnetical implications that originate from the integration of the two functionalities, and, second, applied within an optimization routine to obtain a final design. The optimal design is then compared to 3-D finite element analysis simulations.