Commutated Voice Coil
Original Publication Date: 1979-Apr-01
Included in the Prior Art Database: 2005-Feb-20
Small size linear actuators, such as a voice coil motor, which have a long gap and a short coil, have the problem of pole saturation due to the large magnet size and resultant high flux densities. On the other hand, short gap, long coil motors can have serious solenoid effects which result in nonlinear force constants and leakage flux forces which can contribute to nonlinear forces.