I am working a device that controls the spacing of two strong N52 magnets. I have a cheap DC motor with 960oz-in of torque driving a slider and crank linkage. The poles of the magnet are such that as the magnets get close there is an attraction force. As the motor turns it will move one magnet back and forth from a stationary magnet.
I need to have fine control of the position of the crank throughout the motion. Given the non linear nature of the magnet force as they get real close, it will jerk the crank on forward. I am in the process of putting some control logic on this motion but I am worried about tearing up the motor as I would assume I would need to change directions and resist the magnet pull and then switch again to accelerate out to move the magnets away.
This will be a high cycle application moving at about 1 hz frequency. The loading would be about 26lbf.
Will I trash a motor doing this? Should I be looking for a special feature?
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