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Need Help regarding 12v DC Motor

Samad

Jun 10, 2016
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HI Friends, I'm New to THis forum. I need your help , i was thinking to build a Solar Powered water pump project. I found a 12v DC Brushless Motor on aliexpress for 45$ i was thinking to replace it with existing 220v AC water pump water may be its 1Hp or .75HP not confirmed.. but you can get the idea by seeing the pictures..

Details of 12v DC Brushless Motor:
RPM = 12v 2400RPM / 24v 4800RPM
Operating Current: Without LOAD 1.5A
Torque 3.5Nm
Coil Diameter: 1.7mm
Here are the Pictures
HTB1esiGMpXXXXcHXVXXq6xXFXXXG_zps4mtx5yav.jpg


HTB1od9KMpXXXXXYXVXXq6xXFXXXv_zps9w2xhg3p.jpg

HTB1tHi5MpXXXXcBXXXXq6xXFXXXc_zpsimhx7wgt.jpg

HTB1NS9KMpXXXXX3XVXXq6xXFXXXU_zpsl8zrk9u5.jpg

HTB1mO9_MpXXXXaGXXXXq6xXFXXXI_zpscpejsyvk.jpg

Replace this Motor against this..
double-stage-deep-well-250x250_zpsl6cib1cf.jpg


Need your suggestions before investing into it... If we Lower the RPM using Arduino or PWM of 12v DC motor to 1100/900 to something can we get more torque or not?
 
Last edited:

Samad

Jun 10, 2016
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Jun 10, 2016
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guys need your suggestion.. will this Motor make it to PUMP water from well about 100ft Down?
 

duke37

Jan 9, 2011
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No.

The maximum suction is about 30ft, 25 is much better. To do this you will need a foot valve so the pipe is always full of water.

Get a bore hole pump or bilge pump which can be lowered down into the water so that priming will not be a problem. Get one with plenty of head to spare. Use a motor to match your power supply.
 

Minder

Apr 24, 2015
3,479
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Not only is the motor unsuitable for this application, they are intended to be ran at much higher rpm's than practical for a pump.
The pump example you show is probably a 3ph 4 pole or even 6 pole induction motor.
M.
 

Samad

Jun 10, 2016
3
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Jun 10, 2016
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means Higher the RPM will not Pump the water..??? i was just thinking to retrofit this... because as a lumpsum calculation... 3.8nm Torque or 2400rpm is good to run Pump only... and the picture i have shown is bigger because i have unable to find smaller motor pump... 2nd thing In my country.. Mostly People have retrofit Honda GX160 Gasoline Engine with this REd pump to Pump water from 150Ft below... and the Engine rpm is about 2800rpm... to 3200rpm
 

duke37

Jan 9, 2011
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What is a REd pump?
If your engine runs at 3000rpm, then I suspect that it is driving an alternator to give 50Hz like the mains.

How do the pumps manage to draw from 150ft? The energy must be put in at the bottom of the well.

A centrifugal pump will probably need a power input proportional to the cube of the speed. If the speed is too high the structure could be overloaded and cavitation could occur resulting in rapid deterioration of the impeller.
 

BobK

Jan 5, 2010
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And, by the way, 1 HP is 745W, 12V at 1.5A is 36W. So the motor is nowhere near 3/4 HP. If it were 100% efficient it would be 1/20 HP.

Bob
 
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