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Dynamic braking
The supply to the armature of the motor is disconnected keeping the field excitation unchanged and the armature terminals are immediately connected to an external resistor.
The motor will now act as a generator and the induced voltage E will circulate an armature current in the opposite direction.
This reverse current produces reverse torque and the machine will come to stop quickly.
In practice, the value of the external resistor is chosen such that the initial braking current is about twice the rated motor current.
As the motor slows down, the induced voltage reduces. Hence the armature current and braking toque become smaller and smaller.
Some times mechanical braking is combined with dynamic braking to stop the machine quickly.
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