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09 Oct 2019 07:11 - 09 Oct 2019 07:34 #147538 by phillc54
Replied by phillc54 on topic moving problem
A couple of rules of thumb I have used:

Current should not exceed the motors rated current.

Motor supply voltage maximum = 32 * SQRT(motor_inductance)

Edit: I should have added don't exceed your drivers maximum voltage.
Last edit: 09 Oct 2019 07:34 by phillc54. Reason: more info
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09 Oct 2019 07:39 #147539 by RoberCNC
Replied by RoberCNC on topic moving problem
Technical Specifications

Part No.: 23HS9430B
Frame Size: NEMA23
Phase: 2 Phase
Step Angle: 1.8 degree
Current: 3 A
Rated Voltage: 4.8V
Resistance: 1.6Ohm/phase
Inductance: 6.8 mH/phase
Holding torque: 425 oz-in (2.8N.m)
Detent torque: 12N.cm
Rotor inertia: 800 g.cm²
Number of wire leads: 4
Weight: 1.7 kg
Length: 112 mm

this would be the datasheet of my steppers, according to what you say I should not exceed 3A (in RMS), which I comply with, and the maximum voltage would be 6.8 * 32 = 217.6, the latter is not very clear to me

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09 Oct 2019 08:00 #147541 by Clive S
Replied by Clive S on topic moving problem
Rob those motors are quite high inductance I usually buy 8 wire motors nema23 that are wired in parallel that have 3.2mH at 4.2A

The voltage is down to the drives you have ie if they are 50v drives then you can go to about 36v on 80v drives i generally use them at about 68V without issue
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09 Oct 2019 08:01 #147542 by phillc54
Replied by phillc54 on topic moving problem
32 × sqrt(6.8) = 83.44579079

So your max motor supply would be 83V or you drivers rated max voltage, whichever is lowest.

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09 Oct 2019 08:25 #147544 by RoberCNC
Replied by RoberCNC on topic moving problem

Clive s wrote: Rob those motors are quite high inductance I usually buy 8 wire motors nema23 that are wired in parallel that have 3.2mH at 4.2A

The voltage is down to the drives you have ie if they are 50v drives then you can go to about 36v on 80v drives i generally use them at about 68V without issue


I write down that information, thank you very much, it is a fact that I did not know and important for me in the future.

Thanks to you too Phill, I just deduced that sqrt is square root. All this leads me to what fellow Rodw and Tommy had told me, but I wanted to know a little more about where the numbers come from, to gain knowledge, thank you very much dudes.
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20 Oct 2019 11:40 #148403 by RoberCNC
Replied by RoberCNC on topic moving problem
Hello everyone.
While I'm waiting for the power supply I'm making improvements, one of them is to implement an Xbox joypad as a pendant following the Big John manual and of course, I have problems, hahahaha, but before asking for help I wanted to ask if it is correct to do it in this thread or if I should send it somewhere else. Thank you.

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20 Oct 2019 22:03 #148436 by phillc54
Replied by phillc54 on topic moving problem
If it is an unrelated issue it is probably best to find a section in the forum that the new issue relates to and begin a new thread.
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