I want to replace an AC motor with a DC motor

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SUMMARY

The discussion centers on replacing a 1/30 Hp AC motor (1.12A, 3000 RPM, 60 Hz) with a 12V DC motor for a rock tumbler powered by solar panels. Key considerations include the significant increase in current demand, as the DC motor would require over 11A to match the power output of the AC motor. Participants emphasize the importance of understanding minimum torque, RPM, and current requirements, as well as the necessity of a suitable 12V power supply. Additionally, they highlight potential voltage drop issues over a 35-foot run using 8 AWG wire from the solar panels to the controller.

PREREQUISITES
  • Understanding of AC and DC motor specifications
  • Knowledge of electrical current requirements and power calculations
  • Familiarity with solar panel systems and battery banks
  • Awareness of voltage drop calculations in electrical wiring
NEXT STEPS
  • Research "DC motor torque and RPM requirements" for motor selection
  • Learn about "calculating voltage drop in electrical wiring" for long runs
  • Explore "solar panel output characteristics" to understand loaded vs. open circuit voltage
  • Investigate "12V power supply options" suitable for high current applications
USEFUL FOR

Individuals interested in DIY solar projects, electrical engineers, and hobbyists looking to replace AC motors with DC motors in applications like rock tumblers.

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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