ECE 4411 Dynamic Braking of Induction Motors Slow down a machine by converting kinetic energy stored in the rotating mass to heat energy in the rotor and/or.

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Presentation transcript:

ECE 4411 Dynamic Braking of Induction Motors Slow down a machine by converting kinetic energy stored in the rotating mass to heat energy in the rotor and/or stator windings. Switch the motor from the line to a braking circuit that causes the motor to behave as a generator with a connected load.

ECE 4412 Dynamic Braking of Induction Motors Methods of braking include DC Injection and Capacitive braking. Note that there is no “holding” torque at the end of the braking period – need a mechanical brake to hold the shaft.

ECE 4413 DC Injection Method

ECE 4414 DC Injection Method Disconnect the motor from the line and supply a DC source to any two terminals of the stator through a current-limiting resistance. The DC voltage sets up a stationary magnetic field that generates a voltage in the rotor windings, dissipating energy as I 2 R losses, slowing the motor.

ECE 4415 Capacitor Braking Method

ECE 4416 Capacitor Braking Method Disconnect the motor from the line and connect a capacitor bank to the stator terminals. Motor behaves as a self-excited induction generator. Rotational energy is dissipated as I 2 R losses in the rotor and stator windings. Increase the effect by adding resistor load.