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Old 03-15-2016, 01:00 PM   #2637 (permalink)
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Originally Posted by thingstodo View Post
Dumb question - this is a 3 phase AC motor, right?

If so, I don't understand 'started the motor with outlet ac'

It sounds like the feedback is working .. so likely the software is working ..

Paul will likely correct me .. I think it's time to check the signals at the IGBTs. If the signals are not there (which it sounds like they are not) then follow the circuit back and find out what is missing. The voltage across the IGBT terminals should be some voltage. If you use the DC scale on your meter it should register something besides 0.00 if it is working and you have some throttle signal to say 'GO'.

I'm not sure there is a fault if the DC bus is not getting charged up. Current is measured but I don't remember voltage being measured. A problem with the DC bus is a possibility .. if the IGBTs are getting signal.

There is a DC/DC converter that puts out 24V when you give it 12V. Check that it is giving you 24V out. It is adjustable from about 22V through 26 or 27V. The electronics may work at less than 24V .. maybe the IGBTs don't.

If Paul does not log in and comment today, I'll be seeing him tomorrow.... I'll ask if he has any suggestions. I'm taking up most of his free time so he may not log in!!
i powered the motor with ac outlet, so the motor turns at his nominal speed.. then i started streaming the motor speed to check if the encoder was working... like i said the correct rpms i got with 2048 tick per rev, when my encoder is 1024 pulses per rotation.

i checked for hardware errors... but there is no error i think...

because on same board i tested AN1162 application notes's code and the motor works fine in openloop....

thingstodo i appreciate your help thanks agian

Last edited by shaggythegangsta; 03-15-2016 at 01:07 PM..
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