Use PWM to control your Jebao DCT pump using brushless motor controller from ebay
- Thread starter d0ughb0y
- Start date
karimwassef
Active member
ok. Here's the first batch of results. Either the Jebao native controller is a power hog, or it does create more drive. Tomorrow, I'll try and get the green controller wired to my Apex to test.
So - first the setup:
<a href="http://s1062.photobucket.com/user/karimwassef/media/C3F9716E-7441-4B25-83F9-FAB6076A051F_zpspphphjvk.jpg.html" target="_blank"><img src="http://i1062.photobucket.com/albums/t496/karimwassef/C3F9716E-7441-4B25-83F9-FAB6076A051F_zpspphphjvk.jpg" border="0" alt=" photo C3F9716E-7441-4B25-83F9-FAB6076A051F_zpspphphjvk.jpg"/></a>
basically, I let the run pump in a closed loop to get to full speed and stabilize the current consumption. Then I use a sliding gate valve to suddenly shut that path off and simultaneously push the timer on the stopwatch. When the water level in the 5 gal bucket crosses the 5 gal mark, I stop the watch and take the reading. The container around it is because I didn't want to be focused on reopening the gate valve. It's secondary to catching the stopwatch reading so I needed some protection in case the bucket overflowed.
Then reset and repeat...
Here's an example reading
<a href="http://s1062.photobucket.com/user/karimwassef/media/69B848E9-CC6F-41F5-84B6-ECC307730B78_zpsllt99urh.jpg.html" target="_blank"><img src="http://i1062.photobucket.com/albums/t496/karimwassef/69B848E9-CC6F-41F5-84B6-ECC307730B78_zpsllt99urh.jpg" border="0" alt=" photo 69B848E9-CC6F-41F5-84B6-ECC307730B78_zpsllt99urh.jpg"/></a>
and the results
<a href="http://s1062.photobucket.com/user/karimwassef/media/0_zpsunlxunql.png.html" target="_blank"><img src="http://i1062.photobucket.com/albums/t496/karimwassef/0_zpsunlxunql.png" border="0" alt=" photo 0_zpsunlxunql.png"/></a>
So there's a little drift in the 1-10 relating to power drive, but overall, the power and flow line up. The old pump just seems to have more power for the same set point.
I'm sure there's some pump to pump variability.
So - first the setup:
<a href="http://s1062.photobucket.com/user/karimwassef/media/C3F9716E-7441-4B25-83F9-FAB6076A051F_zpspphphjvk.jpg.html" target="_blank"><img src="http://i1062.photobucket.com/albums/t496/karimwassef/C3F9716E-7441-4B25-83F9-FAB6076A051F_zpspphphjvk.jpg" border="0" alt=" photo C3F9716E-7441-4B25-83F9-FAB6076A051F_zpspphphjvk.jpg"/></a>
basically, I let the run pump in a closed loop to get to full speed and stabilize the current consumption. Then I use a sliding gate valve to suddenly shut that path off and simultaneously push the timer on the stopwatch. When the water level in the 5 gal bucket crosses the 5 gal mark, I stop the watch and take the reading. The container around it is because I didn't want to be focused on reopening the gate valve. It's secondary to catching the stopwatch reading so I needed some protection in case the bucket overflowed.
Then reset and repeat...
Here's an example reading
<a href="http://s1062.photobucket.com/user/karimwassef/media/69B848E9-CC6F-41F5-84B6-ECC307730B78_zpsllt99urh.jpg.html" target="_blank"><img src="http://i1062.photobucket.com/albums/t496/karimwassef/69B848E9-CC6F-41F5-84B6-ECC307730B78_zpsllt99urh.jpg" border="0" alt=" photo 69B848E9-CC6F-41F5-84B6-ECC307730B78_zpsllt99urh.jpg"/></a>
and the results
<a href="http://s1062.photobucket.com/user/karimwassef/media/0_zpsunlxunql.png.html" target="_blank"><img src="http://i1062.photobucket.com/albums/t496/karimwassef/0_zpsunlxunql.png" border="0" alt=" photo 0_zpsunlxunql.png"/></a>
So there's a little drift in the 1-10 relating to power drive, but overall, the power and flow line up. The old pump just seems to have more power for the same set point.
I'm sure there's some pump to pump variability.
karimwassef
Active member
No. This is with the native Jebao controller
karimwassef
Active member
So 1m ~ 11,500 liters per hour ~ 3000 gph
With the Jebao controller on 10, I peaked at ~2600 gph. That's off by 13% from the advertised rating but it may be limited by the controller
karimwassef
Active member
We'll find out tonight. I set up the new VDM module. Still need to make the cables.
I think the difference in flow is ok given that my flow measurement error increases at high flow rate because 5gal is a very small volume at 2600gph, so fractions of a second errors are more impactful.
I think the difference in flow is ok given that my flow measurement error increases at high flow rate because 5gal is a very small volume at 2600gph, so fractions of a second errors are more impactful.
karimwassef
Active member
Btw, measuring flow is a PITA! But I'll do it for the common good.
Dactylopterus
New member
I think the pump flow is meassured without any back pressure other than the height. Your setup has two elbows creating a lot of back pressure. Your measurements show that the flow of these pumps may be rated correctly.
karimwassef
Active member
Got the Apex control working and able to provide 0-5VDC (0-100 APEX signal).
Unfortunately, at APEX=100 (drive signal = 5VDC), the current draw is only 2.8A @ 24.3V and I can tell that it's not as strong as the native Jebao controller.
I'm going to try using the 5VDC output on the controller itself to see if I get anything different.
Unfortunately, at APEX=100 (drive signal = 5VDC), the current draw is only 2.8A @ 24.3V and I can tell that it's not as strong as the native Jebao controller.
I'm going to try using the 5VDC output on the controller itself to see if I get anything different.
karimwassef
Active member
running off the internal 5VDC only increases the current draw slightly up to ~3A (maybe 3.07A max) . I checked the signal and it's 5.00V.
It's a far cry from the native controller's 4.57A for the same pump.
Going to baseline the native controller again just to see if anything's changed.
It's a far cry from the native controller's 4.57A for the same pump.
Going to baseline the native controller again just to see if anything's changed.
karimwassef
Active member
Jebao controller = 4.57A
Green controller = 3.07A
same conditions...
Green controller = 3.07A
same conditions...
karimwassef
Active member
The pump power is 3 phase square pulses. I would need to capture all 6 voltage and current waveforms and determine the RMS power.
karimwassef
Active member
I'm thinking of what to try next.
I can try the other pump, but their behavior was similar.
I can dig up my data acquisition USB board and wire it up to compare the pump waveforms.
I have two more green boards on the way... I can try them out.
I can add a plate and fan in case any component is thermally limiting output?
I can add a ferrite bead at the DC input to experimentally limit any noise going back to the power supply and limiting it?
I can try the other pump, but their behavior was similar.
I can dig up my data acquisition USB board and wire it up to compare the pump waveforms.
I have two more green boards on the way... I can try them out.
I can add a plate and fan in case any component is thermally limiting output?
I can add a ferrite bead at the DC input to experimentally limit any noise going back to the power supply and limiting it?
Last edited:
karimwassef
Active member
Doughboy- ideas? There aren't many other control points that I see?
d0ughb0y
Active member
Use PWM to control your Jebao DCT pump using brushless motor controller from ebay
The only true way to compare is by flow.
On my setup, the stock and white controller runs the same 35 watts, and green 25 watts.
The stock and white controller both use transistor + N and P channel mosfet pairs, and the green uses IR2101 pre driver + N channel mosfet pairs. So it made sense that the white and stock controller showed the same power usage. Both white and green board are based on the same JY01 motor controller chip.
Both circuits are pretty standard and every article I read about BLDC driver uses one or the other circuit and I frequently see mention that the N channel pair circuit is better.
On my small pump, I can't tell the difference in flow. I take it on the bigger pump you are able to tell without doing a flow test right?
If that is the case, I can analyze the green board circuit further to see if any mod can be done.
FWIW, I think we both see about 25% less power on the green board from stock.
The only true way to compare is by flow.
On my setup, the stock and white controller runs the same 35 watts, and green 25 watts.
The stock and white controller both use transistor + N and P channel mosfet pairs, and the green uses IR2101 pre driver + N channel mosfet pairs. So it made sense that the white and stock controller showed the same power usage. Both white and green board are based on the same JY01 motor controller chip.
Both circuits are pretty standard and every article I read about BLDC driver uses one or the other circuit and I frequently see mention that the N channel pair circuit is better.
On my small pump, I can't tell the difference in flow. I take it on the bigger pump you are able to tell without doing a flow test right?
If that is the case, I can analyze the green board circuit further to see if any mod can be done.
FWIW, I think we both see about 25% less power on the green board from stock.
karimwassef
Active member
I didn't measure the flow because I could immediately tell that it was significantly lower.
I can run the test but I don't think it's worth it unless there's a path to getting more power into the pump
I can run the test but I don't think it's worth it unless there's a path to getting more power into the pump
karimwassef
Active member
Or try another board vendor? If we're looking at a new board that would basically be a variant of this one, can we debug it and improve it's performance instead?
Similar threads
