steppers (x4)

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 3 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 3 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 3 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 3 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 3 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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Jan Cumps 3 months ago in reply to obones

I'd say: single logic / control part - and wire them so that they turn in the opposite direction.

You may have to beef up the power part of the driver. For a TI DRV8711, it would mean other power MOSFETs, for an integrated driver, you may have to shop for one that can deal with higher current (and voltage headroom).

Or a driver per motor, using the same logic STEP signal
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obones 3 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 3 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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Jan Cumps 3 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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