Use PWM to control your Jebao DCT pump using brushless motor controller from ebay

[d0ughb0y]

I finished writing the motor start up routine.
I made it as close as possible to the stock controller timing.

The stock controller only goes through open loop sequence for 2 cycles then switches over to bemf, then soft start increase from 20% to target %, which by default is 70%, which is the lowest setting. If you turned it off at 100% then soft start will go to 100%. it increments about 3.5-4% per second.

I don't know if the stock controller adds any other control factors like how fast current is changing, etc. When I test this with a pump, I'm going to put a hard stop say after 5 revolutions since I do not have a current sensing circuit on my breadboard.

I just checked the price of current sensing resistors and they are expensive. Like 60 cents each I think. I figure I'll have one fixed value for the resistor, and adjust the voltage level based on the size of pump used. So basically the cutoff current is software configurable.

 

[theatrus]

I just checked the price of current sensing resistors and they are expensive. Like 60 cents each I think. I figure I'll have one fixed value for the resistor, and adjust the voltage level based on the size of pump used. So basically the cutoff current is software configurable.

For a resistor they seem expensive . The Jebao boards use two-three of the same part in parallel to up the volume of it.

I'd suggest just picking a value that gives you a good full scale ADC rating for the largest pump and use different cutoffs for smaller pumps. I ended up with https://octopart.com/wsr3r0200fea-vishay-39853526 since the Allegro motorcontroller already had a handy 10x gain stage on the sense resistor, and that resistor could handle the power.

 

[d0ughb0y]

the jebao controller uses multiple to divide the heat dissipation so smaller wattage can be used. I need 3 1watt 0.15ohm to get a .05 ohm value and equivalent 3 watts.

180 watt pumps can cut off at 8 amps so that's still a little over 3 watts.

 

[theatrus]

the jebao controller uses multiple to divide the heat dissipation so smaller wattage can be used. I need 3 1watt 0.15ohm to get a .05 ohm value and equivalent 3 watts.

180 watt pumps can cut off at 8 amps so that's still a little over 3 watts.

Remember that, unless running at 100%, this is also pulsed power, so not as demanding. A good metal sense resistor will have a good tempco as well.

 

[stage3-s4]

Theatrus, when I can get one of your boards to test out?

 

[theatrus]

Theatrus, when I can get one of your boards to test out?

Ordered, be here in a week or so likely. I still need to grab all the parts for a few of them

 

[Waueamerla1]

You can use a pot and run 10V from the Apex and adjust the pot until the voltage to ground is 5V.

 

[d0ughb0y]

I powered up the circuit, and low side drivers are not switching. Just realized my mistake that I am not using logic level mosfet on the low side. The stock controller uses logic level fets on both high and low side. I want to avoid adding more components, so I'll look for replacement N channel mosfet. It looks like I have to look at IRL part numbers instead of IRF. The high side circuit seems to be switching fine, the gate voltage switches between 24 and 14v.

 

[theatrus]

Watch out for "logic level" FETs where the switching performance at 5V is still terrible (a lot of "logic level" FETs rate RdsOn at 10V)

 

[d0ughb0y]

to simplify things, I'm just going to use the same part as jebao controller


AOD4185 P-channel -40v -40a
AOD4186 N-channel 40v 35a

I think this will work up to 180watt pumps

so now the circuit will be like almost a clone of the jebao controller except for the Arduino.


just ordered the fets. I will resume work once I get the parts.

 

[karimwassef]

Hey! That brings up an interesting option!

Can we just have an arduino board and hardware it on the jebao power board, removing the existing controller??

Think of it as a brushless motor control shield board and connect the appropriate pins.

 

[karimwassef]

any feedback on rigging the Jebao board as an Arduino shield?

 

[theatrus]

any feedback on rigging the Jebao board as an Arduino shield?

Sure, its possible. Just hot-air off the original MCU and tack down the wires to those pads. You can even use the 5V supply.

 

[karimwassef]

So... Why aren't we doing that? Seems like I could use your code directly?

Can you map out the hardwire connections that would align with your code to work?

Potentially one arduino board could run multiple Jebao motor shields?

 

[d0ughb0y]

These spambots repeating old content are getting old

I just reported the last two. The mods supposedly screen postings from new users before they show up. I guess it does not work as intended.

 

[karimwassef]

what bots? I'm not seeing any. Maybe it's something I blocked?

 

[DgenR8]

I just reported the last two. The mods supposedly screen postings from new users before they show up. I guess it does not work as intended.

Sometimes, one gets past the software, thanks for catching it and reporting it.

 

[d0ughb0y]

ok, I thought it was a human screening the postings.
these spammers knows every trick to get past software screening.

 

[karimwassef]

So. Anyone willing to share the wiring diagram Arduino to Jebao motor shield?

 

[dreadnaught92]

Do you think this would be able to drive mp10s?