Keep stepper position rigid after power off

Other Hardware Motors, Mechanics, Power and CNC
1

Hello,

In my project assembly, I'm using bipolar steppers

To find motor start position, I send degree from control application with load or off, and also I'm using Limit switch in case of unexpected shutdown during the process for example with program error.

After finishing the work and before turning off the power, I'm using servo motor with mechanical lock to keep degree position fixed and saved from weight of the part or physical contact

I'm wondering what is a most proper way or possibility to keep stepper motor rigid in particular position after power is plugged off.

Any advice, guide or example would be helpful

2

Hello,

To find motor start position, I send degree from control application with load or off, and also I'm using Limit switch in case of unexpected shutdown during the process for example with program error.

What driver did you use for stepper motor?

3

nielyay:
Hello,What driver did you use for stepper motor?

Hello,

I'm nor really understand, how it is possible to keep stepper rigid without power.

I'm using A4988 on CNC Shield for bipolar steppers with Arduino Due.

4

It sounds like you are using the servo to apply a brake to the motor to keep it from moving. If so I don't really understand your question.

...R

5

timflo:
Hello,

In my project assembly, I'm using bipolar steppers

To find motor start position, I send degree from control application with load or off, and also I'm using Limit switch in case of unexpected shutdown during the process for example with program error.

After finishing the work and before turning off the power, I'm using servo motor with mechanical lock to keep degree position fixed and saved from weight of the part or physical contact

I'm wondering what is a most proper way or possibility to keep stepper motor rigid in particular position after power is plugged off.

Any advice, guide or example would be helpful

Stepper motors only work with power. You'll require a solenoid brake just like the servo motor. Alternative is
using a non-back-drivable power train such as a worm gear.

6

I'm using A4988 on CNC Shield for bipolar steppers with Arduino Due.

have you try using v2 dc motor shield? how many servo did you use?

7

nielyay:
have you try using v2 dc motor shield?

That is not appropriate for a stepper motor.

...R

8

Couple of moths late but you could just short all the 4 wires of the steppers with some relays. I will get way harder to rotate as is working as generator. I have seen this method used to hold milling machines headstocks up after shuting down the controller.

9

timflo:
Hello,

In my project assembly, I'm using bipolar steppers

To find motor start position, I send degree from control application with load or off, and also I'm using Limit switch in case of unexpected shutdown during the process for example with program error.

After finishing the work and before turning off the power, I'm using servo motor with mechanical lock to keep degree position fixed and saved from weight of the part or physical contact

I'm wondering what is a most proper way or possibility to keep stepper motor rigid in particular position after power is plugged off.

Any advice, guide or example would be helpful

You could add an electromagnetic brake, but you'd also have to save the active phase information in EEPROM
on power down too, so that when the brake is released the motor doesn't jump a few steps...