Hi all,
I have two problems with a motor using FOC.
I'm controlling via PPM mapped into duty cycle. It's a small motor (max 300W) with KV=380.
The first problem is that giving 0.050 ms increments in the ppm (in a range 1-2ms ie steps of 5% of the total range) it happens that the motor stops completely as in the following figure.
I think because of the step in duty it has a spike in the current, but actually it didn't hit the value of 20A as maximum current nor the 50A of maximum absolute current. Any idea?
The second problem is that very often it fails completely to keep the sync as in the following picture:
I think it is due to failure in the observer. The motor starts oscillating very strong and with high current, it makes a very bad metallic noise.
I tried to change the speed observer parameters with no luck.
Thanks for any help.
Actually the first problem is due to the max 60k ERPM of V4.12 :(
Second one is not yet clear.
What is your motor poles count and supply voltage? 20% duty is very low for a 380kv motor.
I use a 380kv motor at 80% duty with 50v supply and its fine.
It's 14 poles 6s.
So it reaches 60k ERPM very quickly (50% duty --> 12V*14*380 = 63k ERPM).