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Question about feedback signals motor signals.

Discussion in 'New users start here - FAQ' started by simmo, Feb 3, 2015.

  1. simmo

    simmo New Member

    Joined:
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    have a question about the control system in regards to the Potentiometer and motor.
    an easy example of what I’m trying to determine is, what happens if a long bar was attached to a motor shaft which receives quick CW/CCW signals and held the bar so the motor struggles to move, causing a force (torque) which is able to be felt through the bar when voltage is applied to the motor.
    if the system sends a CW voltage to the motor will the motor need to turn until it reaches some type of set point (balance point in the system) before it sends another signal to the motor, or will the motor still be able to move back and forth, or in this case apply CW/CCW torque through the bar even though the motor with the attached Potentiometer has hardly moved.
  2. RacingMat

    RacingMat Well-Known Member Gold Contributor

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    My Motion Simulator:
    2DOF, DC motor, Arduino
    sorry, it's not clear... :confused:
    what do you want?
  3. simmo

    simmo New Member

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    plan on trying to use the simtools data to operate a motor/motors for FFB in a wheel.
    Using the system for a FFB wheel is different to a motion simulator as it's turned by the user who would fight against resistance of the FFB supplied by the motor.
    in a motion simulator the motors etc have freedom to move in the directions applied by the system, this movement allows the potentiometers to move and assume also allows for an increase and decrease in voltage during the cycle of the movement.
    if a motor was hooked up to a wheel for FFB and e.g. when performing a right hand turn over ripple strips using (roll or heave) to get a quick CW/CCW FFB in the wheel would this CW/CCW force still occur when a potentiometer is connected to the steering wheel shaft ?
    in this case it seems to be no different to just connecting up a potentiometer or resistors of the same value as the "Pot" to the circuit and not fixing it to any shaft or device that allows it to turn due to hardly moving the wheel when fighting against the feedback resistance.
    once out of this right hand turn and off the ripple strips that signal has ended and perhaps now driving down a straight which receives new signals, but all the while whenever a FFB signal is received the potentiometer will hardly move because I am hindering it's freedom of movement.

    if this type of system was used for FFB in a wheel, would it make much of a difference if the potentiometer was not rotating and kept at its central position ?

    Do the potentiometers only control the range of movement in a motion simulator, to keep the actuators movement within a certain range of travel, and perhaps also aid with the power supplied to the motors so it has less at the end of it's movement ?
    or do the pots play an important role in the reversal of the motor when receiving a signal in the opposite polarity.

    Sorry if this is difficult to understand, Struggling to use the correct terminology.
    Last edited: Feb 4, 2015