Do nema stepper motor 34 stepper motors hold the load while powered off?

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Do nema stepper motor 34 stepper motors hold the load while powered off?

If you turn off your "device" so no current is running through the stepper motor, you can use your fingers to turn the axle and feel how much force you need. You need quite little force to rotate it. Even if you don't touch the axle, it will fall out of position if you turn it off in a "non-full-step" position due to the permanent magnets (and even then it can still be a little off).

For this purpose we usually use one current setting when we move the motor and another current when it is at a halt - a hold current. The reason for this is that in full power the stepper motor can get really hot and you don't want to use the "higher" current if you don't need to. On the other hand you don't want to turn it of completely if you want to keep the exact location.

The "hold-current" is high enough to not lose the position, but low enough to keep the temperature down.

If you use a stepper motor driver, such as DRV8825 it has a reference input to "program" the current through the motor. This is usually a simple resistor divider, but with some clever use of 3 resistors you can create an extra digital control signal "Hi/Low current mode" that change the divider, hence the reference voltage and the current.

I have used this technique in direct thermal printers where you can spot instantly if the stepper motor isn't in the exact position all the time.

 

Cloudray Stepper Motor Series has set the standard for quality, reliability, and durability in stepping motors. The precision of our Torque Power motors is matched only by the dependability of their performance. All Torque Power motors are bi-directional and totally enclosed with permanently lubricated ball bearings for long-lasting, smooth operation.
4 Axis Nema 34 Stepper Motor

High Torque, High Precision and Long life is Cloudray's core advantage

 

Low vibration,Low heating, No loss of step
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.
4 Axis Nema 34 Stepper Motor
Higher Resolution,Avoidance of Resonance Regions
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.
4 Axis Nema 34 Stepper Motor
Sturdy structure, extremely long life
High quality materials including bearings and shaft made in Japan
Robust assembly, high speed range, and exceptional performance in even the harshest environments make Cloudray Stepper Motors the perfect solution for demanding positioning applications.
4 Axis Nema 34 Stepper Motor

Short length and light weight allow them to be used in highly integrated systems

4 Axis Nema 34 Stepper Motor
4 Axis Nema 34 Stepper Motor
4 Axis Nema 34 Stepper Motor
4 Axis Nema 34 Stepper Motor
Stepper motor application
Cloudray stepper motor and Stepping Motor Driver are widely used in engraving machine, cutting plotter, textile machine, 3D printer, medical devices,stage lighting equipment, robot, CNC machine, music fountain and other industrial automatic equipment.
4 Axis Nema 34 Stepper Motor
4 Axis Nema 34 Stepper Motor
4 Axis Nema 34 Stepper Motor

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