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steppers (x4)

Jan Cumps 10 months ago

Can you have enough stepper motors? Maybe.

I did an investment. I had one driver IC and a good motor. I added 4 somewhat heavier motors, and 4 Allegro A4988 drivers.

(for my own documentation)

Motor Type: Bipolar Stepper
Step Angle: 1.8 deg.
Holding Torque: 40N.cm (56oz.in)
Rated Current/phase: 1.7A
Phase Resistance: 1.5Ohm±10%
Insulation Resistance: 100MΩ¸ Min, 500VDC
Insulation Strength: 500VAC for one minute
Physical Specification:
Frame Size: 42 x 42mm (1.7 inch x 1.7 inch)
Body Length: 40mm
Shaft Diameter: 5mm
Number of Wire Leads: 4
Wire Length: 400mm
Weight: 280g
Temperature rise: 80deg Max(rated current, 2 phase on)

Rood B+
Groen A-
Zwart A+
Blauw B-

One more strange stepper is on its way from China:
,

Goal is to control them with a single Pico.

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Stevio73 10 months ago

I’ve always been curious about multiples of steppers. Could two be used in the same ‘action’ to multiply the torque or holding force?
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Jan Cumps 10 months ago in reply to Stevio73

You can electrically wire motors parallel or in series. You would not need software to drive them independently in that case. Because a single step command would control both.

Contrary to what you'd initially expect , total torque of two parallel driven steppers is lower than of a single motor. in series, the torque adds, but the maximum stepper speed lowers due to inductance increase.
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obones 10 months ago in reply to Jan Cumps

What if I'd wanted to use two stepper motors for both sides of a gantry system? Should I wire them in series/parallel or would it be more suitable to use two independently controlled steppers?
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acdc90 10 months ago in reply to obones

Hello on the gantry crains i have worked on they 2 motors running in parallel,

compaired to the CNC plasma machines that use 2 drives for 2 motors (maximum deviation of 1mm) across 8m

using rexroth motors and drives with both drives feed back to plc
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acdc90 10 months ago in reply to obones

Hello on the gantry crains i have worked on they 2 motors running in parallel,

compaired to the CNC plasma machines that use 2 drives for 2 motors (maximum deviation of 1mm) across 8m

using rexroth motors and drives with both drives feed back to plc
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shabaz 10 months ago in reply to acdc90

I think they are not stepper motors, I guess? Are they induction motors or something else for the gantry crane for instance, or servo motors?
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obones 10 months ago in reply to acdc90

Thanks, I wasn't in the same ballpark in terms of span, it's more of an idea about reusing inkjet printers mechanical parts to create a "home made" plotter or laser engraver.
But that's something in a corner of my head, not even close to starting
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Jan Cumps 10 months ago in reply to obones

A scanner that I took apart, had a single stepper (with reduction) for the scan wagon. And a toothed belt that interacted with cogwheels at both sides of the scanner. So the force was equal on both sides, but the rubber gave a bit of mechanical leeway.
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