Dynamic braking of three phase induction motor

Dynamic braking is a method of stopping an induction motor quickly by converting the motor's kinetic energy into heat via resistors.

How It Works:

1. Power is cut off to the stator windings (AC supply is disconnected).
2. A DC voltage is then applied to the stator terminals.
3. This creates a stationary magnetic field in the stator.
4. The rotor is still rotating, so it cuts through the stator's magnetic field.
5. This induces current in the rotor bars, which generates a braking torque.
6. The energy is dissipated as heat in the rotor and braking resistors.

📘 Key Features:

• No reversal of motor rotation.
• Independent of load type (works for fans, conveyors, etc.).
• Braking torque is proportional to rotor speed — strongest at high speed, decreases as the motor slows down.