Contents
How do you reverse the direction of a stepper motor?
To change direction you need to reverse the current in one set of coils only. At the moment the two motors are connected in parallel and turn in the same direction. Swap ONE of the coil pairs over and you should be able to get the two motors turn in the opposite direction with the same drive signal.
Are stepper motors reversible?
Reversing the direction of the current in the coils produces motion in the same direction. To change direction you need to reverse the current in one set of coils only. At the moment the two motors are connected in parallel and turn in the same direction.
Can a stepper motor run both ways?
Stepper motors need bidirectional control in automatic machines or robotic applications. The circuit in Figure 1 lets you control bipolar stepper motors and run them in both rotations. Both signals can come from a sensor or a circuit with an open-collector output.
How does a stepper motor work for motion control?
A stepper motor divides a full rotation into a number of equal steps, important for many industrial motor and motion control applications. The motor’s position can be caused to move and hold at one of these steps as long as the motor is carefully sized to the application in respect to torque and speed.
What is the torque constant of a stepper motor?
Holding torque is a measurement of how much rotating force is required to force a stationary stepper motor shaft out of position. Holding torque (T) is the product of a motor’s torque constant (KT) and the current (i) applied to the stator windings. T = KTi . In most applications, electronic drivers control stepper motors.
Why does PWM increase voltage on stepper motor?
A PWM driver will increase the voltage applied to the stepper motor to keep the current and torque constant. At some speed, the power supply will not have enough voltage, and the motor current will begin to fall. The torque drops with the current.
How does a PWM driver keep the torque constant?
V = KEώ + iR + L (di/dt) A PWM driver will increase the voltage applied to the stepper motor to keep the current and torque constant. At some speed, the power supply will not have enough voltage, and the motor current will begin to fall. The torque drops with the current.