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A new axial-field synchronous machine designed for a flywheel accumulator is presented herein. The armature and field windings, fixed in the air gap, are made with double-face printed circuits. A specific armature layout provides a sine-distributed magnetomotive force and solves the problem of crossing the ends of the winding. A two-dimensional semi-analytical model at the mean radius, using surfacic permeances, is then developed. Then, inductances, torque, and eddy-current losses are calculated using this model and compared with experimental results. Index Terms--Axial-field synchronous machine, double-face printed winding, flywheel accumulator, surfacic permeance.

In this paper, a new multi-rod linear actuator is presented. This actuator has been developed for high thrust density and wide mechanical bandpass applications. The multi-air-gap concept will first be illustrated and explained. Its advantages will be highlighted thanks to finite-element method optimizations. Next, the multi-rod prototype technology will be discussed. Lastly, experimental measurements for prototype forces will be provided. Index Terms--High mechanical bandpass, linear permanent-magnet motor.