Reasons for motor stalling

Aravind Anil1

Other Parts Discussed in Thread: HVPMSMMTR

Hi,

I am working on the HIgh Voltage Motor Control kit of TI and trying to control a PMS Motor using it. I have a theoretical doubt regarding this.

What are the reasons which cause the sync between stator and rotor in PMSM to be lost ? I have plotted the graphs of D-axis and Q-axis currents during motor stalling and found an unusually high value for a short time. Why is the D-axis current ( magnetising current ) trying to attain a large value?

Can somebody please help me with this ?

over 11 years ago

0 ChrisClearman over 11 years ago

TI__Guru** 119680 points

bad current information (especially susceptible with low side shunt measurements at higher duty cycles and of course high load)
angle estimation drift or loss, due to current information or from motor parameter inaccuracy / changes (like Rs increasing under load)
current controller not tuned appropriately

from your description of a "blip" I would tend towards the first