I don't know of anyone who has simulated or measured the magnetic field.  Lots of people do motor current analysis though.  Maybe you can infer the necessary info from looking at the current and voltage which are proportional to force and velocity respectively?

Hi Rao,   This is my "brain dump".   DISPLACEMENT Capacitive Laser - Triangulation Method Laser - Spectral Interference Method Laser - Time of Flight Fiber Optic (e.g. Philtec) Ultrasonic High Speed Camera (need large displacement and/or microscope) Laser full field methods   VELOCITY Particle Velocity Probe - Temperature method (e.g. Microflown) Particle Velocity Microphones   ACCELERATION I don't know of any   If I think of any more, I will post again.   Regards, Evro This post was edited by Evro Wee Sit at June 16, 2011 12:16:18 AM PDT