What is the difference between a closed loop controller and open loop controller in stepper motor?
Feed back is not taken into consideration to achieve desired goal is one of the characteristics of the open-loop controller.The drawback of open-loop control of steppers is that if the machine load is too high, or the motor attempts to move too quickly, then steps may be skipped.
In order to obtain a more accurate or more adaptive control, it is necessary to feed the output of the system back to the inputs of the controller, which is called a closed-loop system. If the characteristics of output are not predictable, closed loop system, is prefererable. like load on washing machine, speed of conveyer belt
Feed back is not taken into consideration to achieve desired goal is one of the characteristics of the open-loop controller.The drawback of open-loop control of steppers is that if the machine load is too high, or the motor attempts to move too quickly, then steps may be skipped.
In order to obtain a more accurate or more adaptive control, it is necessary to feed the output of the system back to the inputs of the controller, which is called a closed-loop system. If the characteristics of output are not predictable, closed loop system, is prefererable. like load on washing machine, speed of conveyer belt
Because steppers can hold to each step pulse if they are not overloaded due to high acceleration in inputs or noises. Feedback is necessary for steppers if no programmed input is applied or load condiitions are complicated. Otherwise, open-loop steppers are sufficient for most of the applications with simple design and easy to wire up.
In below reference, the performance of a multimotor system with single common closed loop control has been investigated with particular reference to a two-motor system. The system was found to be unstable, with the velocities of the motors oscillating with increasing amplitude. The origin of the oscillations is discussed, and methods for their elimination are presented. It is concluded that the simple control strategy used is inadequate for stable operation of a multimotor system.
Clarkson, P.J.; Acarnley, P.P., "Closed-loop control of stepping motor systems," Industry Applications, IEEE Transactions on , vol.24, no.4, pp.685,691, Jul/Aug 1988
doi: 10.1109/28.6122
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