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Dynamic or Rheostatic Braking of Electric Motors

Whenever a supply is given to the electric motor, the motor rotates, as the moter rotates, a kinetic energy is stored in its rotating mass. If the motor is disconnected from the supply it continues to rotate for a period of time until the kinetic energy is totally dissipated in the form of rotational losses. The faster the dissipation of the kinetic energy, the move rapid is the braking. During the Dynamic or rheostatic braking the kinetic energy of the motor is converted into electrical energy. This energy is dissipated in resistive elements. The rate of dissipation can be increased by choosing the prefect braking resistance RB.

Simply, a circuit consist of a motor M, power supply S, braking resistance RB and a two pole switch. When a machine is connected to terminal A, it runs as a motor. While the motor rotating, a kinetic energy is stored in its rotating mass. When a machine is connected to terminal B, it dissipates the stored kinetic energy in the form as heat via braking resistance RB. Higher the braking resistance, faster the dissipation of kinetic energy.

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