Paul and Sabrina's Cheap 3 Phase Inverter (AC Controller) with Field Oriented Control - Page 336 - Fuel Economy, Hypermiling, EcoModding News and Forum

Piotrsko · 01-23-2019, 09:50 AM

There was a comment over on diyelectric that the throttle pot needs calibrated parameters to initiate the gates and subsequently turn on the igbts. May need other things calibrated also.

esali1987 · 01-26-2019, 02:51 PM

Ah ok. Ill look into that. I am only using a small pot for now. This pot is outputting 0 and 1023 just fine. would that need any calibration?

thingstodo · 01-26-2019, 05:18 PM

Quote:

Originally Posted by esali1987

Ah ok. Ill look into that. I am only using a small pot for now. This pot is outputting 0 and 1023 just fine. would that need any calibration?

As long as you have the pot in the range of 'no movement' when you power up the controller you should be fine.

The settings (on my controller) are:

Code:

fault-throttle-position=0005

If the throttle input goes lower than 5, ignore the throttle. It's a fault - short circuit.

Code:

max-regen-position=0025

At this value, you are commanding maximum regenerative braking

Code:

min-regen-position=0400

At this value, you are just engaging regenerative braking. It scales linearly from min to max position

Code:

min-throttle-position=0624

At this value, you are just engaging the throttle forward. It scales linearly from min to max position

Code:

max-throttle-position=0972

At this value, you are putting out maximum throttle.

So between 400 and 624, using these settings, is where the throttle should be when you power it up. Raise it to go forward, lower it to 'brake'

I don't remember a fault that is thrown if you are over max throttle. Not sure what happens.

Remember that the throttle is commanding TORQUE, not SPEED. So max throttle is trying to push your max CURRENT through the motor to develop that TORQUE. Keeping the throttle in the same position with a motor on your bench will accelerate the motor up to your maximum speed - at least that's what it did to me.

But only if you have enough voltage on your pack to hit your overspeed setpoint.

NOTE - you don't need to have your throttle near MAX in order to put an unloaded motor up to your max speed. As long as the commanded current will get you to max speed, it will go there. If your throttle is low, it will take a while to accelerate to max speed and trip.

esali1987 · 01-26-2019, 08:46 PM

Does the precharge circuit and HV pack have to been hooked up for this to happen?
Thanks

thingstodo · 01-27-2019, 11:33 AM

Quote:

Originally Posted by esali1987

Does the precharge circuit and HV pack have to been hooked up for this to happen?
Thanks

On my control board, the precharge and main contactors were timed. They clicked when they should have, but only if the throttle was there and was in the dead zone between forward and regen.

If there is no HV pack, the motor won't move. The 12V battery used for the controller ONLY provides power to the control board.

I didn't check if the IGBT drivers fire with no HV pack. I assume that they would, since the control board doesn't really know if the HV pack is there .. at least it didn't in my version.

02BMW02 · 01-27-2019, 03:40 PM

Im slowly putting the invertor together

, has anyone got the pin out for Pauls resolver to encoder board, I currently have ver 1.2, Paul sent me a diagram of ver 1.3 but the pin out looks different , I dont want to chance it.