I want to replace an AC motor with a DC motor

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Discussion Overview

The discussion revolves around replacing an AC motor with a DC motor for a rock tumbler, specifically focusing on the feasibility of using a 12V DC motor in place of a 120V AC motor. Participants explore the implications of power requirements, torque, and the use of solar panels for power supply.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Experimental/applied

Main Points Raised

  • One participant notes that finding a suitable 12V DC motor may be challenging unless certain parameters like minimum torque, RPM, and current are flexible.
  • Another participant emphasizes that a 12V motor would require over 11A to match the power of the AC motor, suggesting that the original motor may not be used at full load.
  • There is a consensus that a 12V power supply is necessary for the DC motor.
  • One participant mentions the importance of wire size due to the high current requirement of the DC motor.
  • A participant raises concerns about voltage drop over a 35-foot run of 8 AWG wire from the solar panels to the controller.
  • Another participant inquires about the loaded output voltage of the solar panels, noting that the stated voltage is typically an open circuit voltage.
  • Participants discuss the use of two 160-watt solar panels to power the setup.

Areas of Agreement / Disagreement

Participants express differing views on the feasibility of replacing the AC motor with a DC motor, particularly regarding power requirements and the implications of using solar panels. The discussion remains unresolved with multiple competing views on the practicality of the proposed solution.

Contextual Notes

Participants have not fully clarified the load conditions under which the AC motor operates, nor have they provided detailed specifications for the solar panels' output under load.

ws309
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Ac motor is 1.12 amp 3000 rpm 60 Hz 1/30 Hp sealed ball bearing. I want to use a 12 V dc motor. Any help would be greatly appreciated. Thank you.
 
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Welcome to PF!

You didn't ask any questions; What, exactly, do you need help with?
 
That might be harder to find than you think unless things like Minimum torque, same RPM and low current are not important. Just looking at V and I you have 120V and 1.12A or 134W, a 12V motor would need over 11A for the same power. However, you are probably not using it at full load, so it might work, you didn't say enough.

Aside from the mechanical requirements, all you should need is a 12V power supply.
 
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Haklesup said:
all you should need is a 12V power supply.

I agree. 11A is nothing to sneeze at but certainly easily manageable. Just watch your wire size and you should be fine.

BoB
 
Haklesup said:
That might be harder to find than you think unless things like Minimum torque, same RPM and low current are not important. Just looking at V and I you have 120V and 1.12A or 134W, a 12V motor would need over 11A for the same power. However, you are probably not using it at full load, so it might work, you didn't say enough.

Aside from the mechanical requirements, all you should need is a 12V power supply.

russ_watters said:
Welcome to PF!

You didn't ask any questions; What, exactly, do you need help with?
I want to run my rock tumbler with solar panels and a battery bank. I don"t want to use an inverter. I am using 8 awg. wire and the longest run is 35' from the panels to the controller.
 
ws309 said:
I want to run my rock tumbler with solar panels and a battery bank. I don"t want to use an inverter. I am using 8 awg. wire and the longest run is 35' from the panels to the controller.
Thank you for the fast response.
 
ws309 said:
I am using 8 awg. wire and the longest run is 35' from the panels to the controller.

you are going to get significant voltage drop over that length of cable

what will be the loaded output voltage of the panel(s) ? ... and note that the stated panel voltage is usually an open circuit voltage
 
davenn said:
you are going to get significant voltage drop over that length of cable

what will be the loaded output voltage of the panel(s) ? ... and note that the stated panel voltage is usually an open circuit voltage
I am using 2 160 watt solar panels
 
ws309 said:
I am using 2 160 watt solar panels
That didn't answer my questions
 

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