Reactance-mass actuator

摘要

Disclosed is an electrodynamic moving coil actuator comprising one or more separate coils contained in interior spaces of a reactance mass. The coils are oriented in closely spaced parallel zones within the interior spaces. The spaces are formed and positioned to be outside of the static magnetic flux lines of the reactance mass. The static flux thus is substantially de-coupled from the dynamic magnetic field of the coil. Magnetic flux choke points are avoided, but at the same time, high volumetric efficiency is achieved. Each coil is attached to supports along its two long outer edges. The supports are connected to each other at their extremities by top and bottom plates which are connected by slide bars that also serve as tie rods. The reactance mass is mounted on the slide bars. The design is adapted to low frequency, high force applications such as active noise control automotive mufflers.