How back-drivable is the stepper motor?
When a stepper is ‘back driven’ is means the rotor is spun by the connected load. The magnets rotating inside the coils create an alternating current generator. What happens to the voltage and current produced is totally dependent on the circuit that is connected to the motor. For an open circuit, the back EMF generated may be very high compared to the rated motor voltage. The motor’s back EMF specs will give guidance. If connected to a driver circuit, diodes in the output transistors may limit the voltage, or actual clamp diodes may be used. If clamp diodes exist then when back EMF generates enough voltage to induce current through the diodes, there will be a resultant resisting torque in the motor. A slowing, or holding the motor will occur.
Without any type of clamping diodes what will usually happen is the back EMF voltage will rise high enough to breakdown the output transistors. A bad thing.
If the power generated by back-driving is dissipated in a controlled manner its called regenerative braking and can be used to charge batteries etc. A good thing.
So after a long ramble - a stepper motor can be back driven, usually will not harm the motor - but the drive circuit needs protection.
Fast Response,Better Acceleration Performance
Thanks to a robust design they can be selected for the harshest environments. Precise, open-loop, speed and position control can be achieved with the application of full step, half step, or microstepping electronics.
Stepping angle is adjustable( rang in 18°±5%）， 0.9 °stepper motor's stepping angle is smaller, fineness is higher and positioning is more accurate.Avoiding vibration,runs more smoothly and gets lower noise.
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