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8. Braking of Electric Machines

8. Braking of Electric Machines. Why Braking. To stop the electric motor. To sustain the speed of the drive system at the desired value. To prevent the motor from over-speeding. To hold the motor shaft at a certain position regardless of the applied load torque. 1. Regenerative Braking.

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8. Braking of Electric Machines

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  1. 8. Braking of Electric Machines

  2. Why Braking • To stop the electric motor. • To sustain the speed of the drive system at the desired value. • To prevent the motor from over-speeding. • To hold the motor shaft at a certain position regardless of the applied load torque.

  3. 1. Regenerative Braking • When the load torque causes the machine to run at a speed > no-load speed, but without changing its direction of rotation, the motor is in regenerative braking.

  4. Speed Power Flow Power Flow T T m m w Load w Load T T load M load G Torque Fm Fm   F Fl F Fl

  5. 2. Dynamic Braking • When the motor is running, kinetic energy is stored in its rotating mass. • If the kinetic energy of the motor is dissipated in a resistive element, the motor stops.

  6. IB IA B A RB Source MOTOR B A

  7. 3. Counter Current Braking • If the the airgap field reverses its rotation, the rotor shaft must also reverse its rotation.

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