Board most suited to drive 5x Nema 8 (5x 1A, low heat)?
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Hi,
I would like to drive motors smaller than the usual ones for which the board is designed:
- Nema 8 (PHB20Y28-406)
- 2 phases, 0.6A/phase -> 1.2A total rating
- 0.9 mH/phase inductance
- 3.2 Ohm/phase
Looking at a comparison of the drivers of the Duet 2 and 3 (TMC2660, TMC2209), I am not sure whether one would be more suited than the other. Desired features:
- driving 5x Nema 8 motors at 1A each (~85% of the 1.2A rating)
- minimizing the heat generated by the board. The board will be in a metal enclosure along with some small electronics. Is ventilation of the enclosure recommended to drive such small motors (the rest of the electronics in the box does not generate heat)? I believe having simple ventilation holes without a fan would be enough?
This post seems to suggest that the Duet2-TMC2660 might be cooler due to the lower resistance?
Also, these boards do not require heatsinks on the motor drivers because they already dissipate efficiently into the PCB, correct?
Thanks for any hint
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Duet 2 wifi/ethernet or Duet 3 mini5+ would be good options.
For cooling, I would say that some passive ventilation would be required at minimum regardless of what you drive. Sealing up electronics entirely is never ideal. Is this going to be in a harsh/dirty environment?
Mounting the board vertical can help as well since both sides of the board are able to convect upwards.
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Thanks @phaedrux.
Duet 2 wifi/ethernet or Duet 3 mini5+ would be good options.
OK, thanks.
I would say that some passive ventilation would be required at minimum regardless of what you drive. Sealing up electronics entirely is never ideal.
Absolutely, I agree.
Is this going to be in a harsh/dirty environment?
Quite clean environment. I can have passive ventilation holes on several sides.
Mounting the board vertical can help as well since both sides of the board are able to convect upwards.
I see. Unfortunately, I'll have to mount it horizontally.
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At 1 amp you'll be fine with some vent holes.
