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Difference between slow decay and fast decay

Jack CCY
Intellectual 1695 points

Hi all,

I'm now learning the motor driver basics. I've found a question about motor brake and coast during slow decay and fast decay.

Why motor is going to brake in slow decay but coast during fast decay? Can this be explained using mathematical formula?

Motor BEMF=U-I*R     during slow decay:  BEMF= - I*R     during fast decay: BEMF= -U-I*R   BEMF=Ce*Phi*n   n is speed.

Thanks a lot.

Best Regards