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Following the European rules about machines, for an emergency stop you cannot use any electronic system but only a brale ( breaks in case of missing power ).
It can be helped by electronics, but not electronics only.
If you want to brake the AC motor you need to inject a DC current into stator.
This is as you fix a vecto in oune position and force the motor to follow this vector.
The induced current on the rotor perform resistive losses on it then take in account that before another braking action you need to cool enugth the rotor.