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Low speed FOC control X nucleo-ihM07m1

Question asked by imtiaz on Apr 21, 2016
Latest reply on Feb 21, 2018 by llantalan .
Hi ,

Just a bit of background. We do motion control products and require smooth low speed to high speed motion. We also need high torque and all this lends itself to BLDC and PMSM motors. From the research Ive done it seems that FOC control may be the best bet. However after getting the dev board mentioned above with the nucleo -F302r8 and teh bull running 7 pole motor and the ST MC workbench - the low speed control is really  quite useless - the motor stalls below 1500 RPM - even with simple trapezoidal control I can easily go down to 500 RPM with most high speed motors. I have tried tuning the PID loop from default values - I get some improvement on low speed oscillations but it still stalls at quite  high speeds. I will try other motors in the meantime can anyone shed some light on how to get really smooth and really slow motor movement without using a stepper and their practical experience with St's FOC librarty and low speed control which is supposed to be the main advantage of FOC. Thanks a lot , Imtiaz





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