Controlling brushless motor CURRENT
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I have an application where I need to control tension on a reel of film in a
camera. One motor feeds the film into the camera, the other motor takes up
the film. I am using the stamp to measure the amount of footage on the reel
and to stop the motors when the film runs off the reel or when it breaks.
I want to use brushless DC servo motors in an open loop, they run at maximum
speed in the direction to apply tension to the film reel and to take up the
film as it comes in. I want to place a sensor ARM on the film to measure the
tension, say a Hall Effect or an Encoder. As the ARM changes position, I
want to apply CURRENT to the motor so that the motor has just enough power to
maintain the proper tension on the film.
I would like to feed the ARM sensor info into the stamp and have the stamp
output a control voltage to a chip/circuit that controls the CURRENT portion
of a brushless servo amplifier.
Does anyone know of a motor amplifier or circuit that I could control in this
way?
Lee
camera. One motor feeds the film into the camera, the other motor takes up
the film. I am using the stamp to measure the amount of footage on the reel
and to stop the motors when the film runs off the reel or when it breaks.
I want to use brushless DC servo motors in an open loop, they run at maximum
speed in the direction to apply tension to the film reel and to take up the
film as it comes in. I want to place a sensor ARM on the film to measure the
tension, say a Hall Effect or an Encoder. As the ARM changes position, I
want to apply CURRENT to the motor so that the motor has just enough power to
maintain the proper tension on the film.
I would like to feed the ARM sensor info into the stamp and have the stamp
output a control voltage to a chip/circuit that controls the CURRENT portion
of a brushless servo amplifier.
Does anyone know of a motor amplifier or circuit that I could control in this
way?
Lee