4901
General Mach Discussion / Re: Only X-axis motor is working
« on: March 30, 2018, 05:54:34 AM »
Hi,
having your steppers wired correctly is mandatory to get them to work properly. As you point out you need to get the best from them no matter what power supply you
use.
If you can find documentation...all well and good. If you can't then the trouble starts. There are two basic approaches you could take:
1) Using instrumentation including an oscilloscope, sinusoidal signal generator and resistance meter make measurements to work out the wiring
2) Write down all the possible combinations of wiring and using what instruments you have eliminate as many as you can and thereafter try each remaining combination to find the best
performing combination.
Do you have electronic test gear or know someone who has and will help?
I bought a new old stock 5 phase Vexta stepper. It has 10 wires, 2 for each phase. They are electrically isolated from each other so determining the pairs of wires was easy.
There was documents that came with it and my measurements were confirmed. What the documents did not cover was the phase of each winding. I was able to determine
the phase by feeding one winding with a 1kHz sinusoid and then measuring the phase of the induced voltage in each of the other windings.
To do the same thing with a two phase stepper would be similar. Determine the 4 pairs of wires with a multimeter. Feed one winding with a sinusoid and measure the induced voltage
on each of the remaining windings. There will be one which is in tight phase (antiphase) of your input being the winding in the same slots or phase of the stepper. The remaining two windings
will be slightly less strongly coupled and will be the two windings associated with the the second phase of your two phase motor.
This process can be confusing and you will need a solid understanding of transformer action to decode the measurements you make. 'Character building'....mind you I don't have any character
and don't really want to start now!
Craig
having your steppers wired correctly is mandatory to get them to work properly. As you point out you need to get the best from them no matter what power supply you
use.
If you can find documentation...all well and good. If you can't then the trouble starts. There are two basic approaches you could take:
1) Using instrumentation including an oscilloscope, sinusoidal signal generator and resistance meter make measurements to work out the wiring
2) Write down all the possible combinations of wiring and using what instruments you have eliminate as many as you can and thereafter try each remaining combination to find the best
performing combination.
Do you have electronic test gear or know someone who has and will help?
I bought a new old stock 5 phase Vexta stepper. It has 10 wires, 2 for each phase. They are electrically isolated from each other so determining the pairs of wires was easy.
There was documents that came with it and my measurements were confirmed. What the documents did not cover was the phase of each winding. I was able to determine
the phase by feeding one winding with a 1kHz sinusoid and then measuring the phase of the induced voltage in each of the other windings.
To do the same thing with a two phase stepper would be similar. Determine the 4 pairs of wires with a multimeter. Feed one winding with a sinusoid and measure the induced voltage
on each of the remaining windings. There will be one which is in tight phase (antiphase) of your input being the winding in the same slots or phase of the stepper. The remaining two windings
will be slightly less strongly coupled and will be the two windings associated with the the second phase of your two phase motor.
This process can be confusing and you will need a solid understanding of transformer action to decode the measurements you make. 'Character building'....mind you I don't have any character
and don't really want to start now!
Craig