A linear motor is essentially a multi-phase alternating 
current (AC) electric motor that has had its 
stator "unrolled" so that instead of producing a torque 
(rotation) it produces a linear force along its length. The 
most common mode of operation is as a Lorenz-type actuator, 
in which the applied force is linearly proportional to the 
current and the magnetic field (F = i × B).