Understanding Residual Flux and Inconsistent Rotation in Stepper Motors

In summary, the conversation discusses a stepper motor with a resolution of 0.25 degrees per step. Pumping in 20 steps initially results in a 5 degree rotation, but subsequent attempts do not result in the same rotation. This could be due to residual flux preventing the motor from fully rotating, or potentially skipping steps if the speed is too fast. It is suggested to ramp up the stepping speed gradually to avoid this issue.
  • #1
sandy.bridge
798
1
Quick question: I have a stepper motor that is 0.25 degrees per step, and so 4 steps is required for a degree. When we pump 20 steps into it, it moves 5 degrees. However, if we go to pump another 20 steps into it right after that, it does not move 5 degrees. Is it possible that residual flux is preventing it from fully rotating after the initial rotation?

An example of what will happen is as follows:

pump in 20 steps: get 5 degrees of rotation
pump in 20 steps: get 2 degrees of rotation
pump in 20 steps: get 5 degrees of rotation
pump in 20 steps: get 2 degrees of rotation

and so on
...

It seems to be consistent in that sense. Any clarification or insight would be appreciated.
 
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  • #2
Sometimes if you try to step it too fast it will skip steps. Also, you may need to ramp up the stepping speed because the motor can't go from zero to maximum speed instantaneously.
 

What is an odd stepper motor behaviour?

An odd stepper motor behaviour refers to any unusual or unexpected movement or malfunction of a stepper motor. This can include skipping steps, uneven rotation, or irregular speed.

What can cause odd stepper motor behaviour?

Odd stepper motor behaviour can be caused by a variety of factors, including incorrect wiring, improper voltage or current, mechanical issues such as binding or misalignment, or software errors.

How can odd stepper motor behaviour be prevented?

To prevent odd stepper motor behaviour, it is important to carefully follow the manufacturer's instructions for wiring and operation. Additionally, regularly checking for any mechanical issues and properly maintaining the motor can help prevent unexpected behaviour.

How can odd stepper motor behaviour be diagnosed?

To diagnose odd stepper motor behaviour, it is important to troubleshoot and eliminate potential causes one by one. This can include checking the wiring and connections, adjusting voltage and current, and inspecting the mechanical components for any issues.

When should I seek professional help for odd stepper motor behaviour?

If troubleshooting and adjusting the motor does not resolve the odd behaviour, it may be necessary to seek professional help. This can include consulting with a specialist or contacting the manufacturer for assistance.

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