Paul and Sabrina's Cheap 3 Phase Inverter (AC Controller) with Field Oriented Control

[esali1987]

Got the communication working!! Might have put the connector on the wrong side of the board. oops. With the throttle hook up i am reading 0-1023 going to both extremes.

throttle-type 1
stream-raw-throttle 1
data-stream-period 100

is the commands i used. I am guessing this is what should happen. Next step is battery hookup?

[thingstodo]

Originally Posted by esali1987

Got the communication working!! Might have put the connector on the wrong side of the board. oops. With the throttle hook up i am reading 0-1023 going to both extremes.

throttle-type 1
stream-raw-throttle 1
data-stream-period 100

is the commands i used. I am guessing this is what should happen. Next step is battery hookup?

0 - 1023 is GREAT for the throttle signal. My throttle does not make it all the way to either extreme.

It's been a while since I started from the base firmware but I think the defaults work OK with a low voltage pack. The response is a bit slow but that's fine for testing.

It would be great to see the outputs to the IGBTs on a scope to make sure they don't overshoot too badly. Paul has the resistor values dialed in to prevent that .. but it's one thing I'd check. After checking all 6 outputs, it would be time a test with low pack voltage.

You can connect your AC motor and just check the output on your scope with low settings for max battery amps.

Your AC motor will spin with lower voltage, but it takes a certain minimum current so don't be surprised if you're pushing about 1/3 of your rated amps before it starts to spin.

[esali1987]

Thanks ThingsToDo! this is super helpful! Ill do that. For motor type im working with a Siemens PM motor This looks to be motor type 4? Ill start with a 54V battery pack for testing.

[02BMW02]

Originally Posted by esali1987

throttle-type 1
stream-raw-throttle 1
data-stream-period 100

What is the difference between :

stream-raw-throttle 1
and
stream-throttle 1


I have set my min and max throttle positions

[esali1987]

For stream-raw-throttle I get values from 0-1023 and for stream-throttle I get values of -506 to 506. I have set my values to the raw throttle values and it seems to be working. That is as far as i've gotten. Still figuring why i cant read the output signals to the IGBTs.

[esali1987]

I now have a good throttle signal and HV hooked up to the IGBTs. Phase to phase I dont get any signal and I am not really sure where I should measure to see the control voltage from the IGBTs. Can anyone help with this? Thanks!

[Piotrsko]

Voltage on the phases or voltage between the phases? I would think between phases should be zero.

Tried to use a high impedance dvm on the gate pins? Should swing from 5 neg to positive 15, I think, depending on driver specs.

I'm not a pro, just a casual comment

[thingstodo]

Originally Posted by esali1987

I now have a good throttle signal and HV hooked up to the IGBTs. Phase to phase I dont get any signal and I am not really sure where I should measure to see the control voltage from the IGBTs. Can anyone help with this? Thanks!

Sorry - I didn't see this as a new post for some reason

Agreed - voltages should swing from slightly negative (-3V or -5V) to about 15V.

I don't have access to my controller - it will be Jan 2 before I can go home and look. I should look at that in any case to determine if I killed my control board when I killed my IGBTs, or if I just killed the IGBTs.

The IGBTs are driven (or they were in my version ) by through-hole connections direct to the IGBT pins. I don't remember how many pins, or what the signals are for each. That's what I'd have to look up.

[esali1987]

Sorry I wasn't very clear on that first one. So for the motor, there is continuity between all three phases and high resistance between the ground and phases of the motor. This is good.
For the Board, without 54.6 VDC on the High voltage line, I am getting 0.33 VAC from the 6 gates to GND. With the HV on at 54.6 VDC, it is 2.7 VAC on all the gates and to the 3 phases? None of this is changing with throttle action. This is normal?
I probably couldn't get the motor to do anything anyway as I am trying to make a siemens PMAC 1FV5139 do something. Motor is not hooked up for this instance.

Thanks for all the help!

[Piotrsko]

Starting with: are you using an auto ranging / auto sensing meter? Vac on a gate driver doesn't make sense. Could be an ac signal on a dc offset?

O'Scope would help here.