Patent attributes
An electromagnetic inertial force generator provides a linear output with improved compactness and reliability because it has no radial gaps and only one pair of axial gaps. Radial permanent magnet rings are directly in contact with inner and outer flux cylinders to provide magnetic bias. The magnetic bias flux flows across two axial air gaps to a supporting flux return structure. A current conducting coil drives magnetic flux across the same axial air gaps. The magnetic bias flux is in opposite directions across the two air gaps, while the coil flux across the two gaps is in the same direction. The combination of bias flux and coil flux cancels in one gap and adds in the other gap, producing a net force on an inertial mass and an equal and opposite force on the supporting structure. The resulting force is linear with current through the drive coil.
