Forms Of Closed Loop Stepper Control

Closed loop control avoids the heat problem by supplying just the current demanded by the velocity loop.

Forms of closed loop stepper control.

Cnc closed loop stepper motors aka hybrid stepper motors. Gears motors forms of closed loop stepper control. Closed loop operation brings with it the risk of instability if the loop is not correctly tuned so care must be taken to achieve stability. Microstepping is the method of driving a stepper motor in such a way that every whole step of the motor is broken down into smaller increments called microsteps.

The position of the motor is always monitored and then the driver automatically switches between 2 types of control depending on the situation. Stepper motor systems using closed loop control represent a small percentage of stepper motor applications but if loss of position could be catastrophic to the application yet the system requires high torque at low speed relatively simple architecture and relatively low cost compared to a true servo motor system a closed loop stepper might be the most appropriate solution. Closed loop microstepping is a true closed loop mode of operation and is the optimum use of a stepper motor still being driven as a stepper. Servo control systems are best suited to high speed applications that involve dynamic load changes like robot arms.

Open loop stepper motors operate with a constant current and give off a significant amount of heat. In this session of motion control classroom we explain the differences between various stepper motor designs including permanent magnet variable reluctance and hybrid types and the performance characteristics of each. Alphastep products are stepper motor based hybrid motors with a unique hybrid control system combining the benefits of open loop control and closed loop control. How are they different from stepper motors used in most hobby cnc applications and 3d printers.

Closed loop operation brings with it the risk of instability if the loop is not correctly tuned so care must be taken to achieve stability. Forms of closed loop stepper control.