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Which braking involves saving energy
Dynamic
Plugging
Regenerative
All of the above
Regenerative
Regenerative braking is the only braking method where the kinetic energy of the mechanical load is converted back into electrical energy and fed back into the supply source. This process significantly increases the overall efficiency of electric traction systems.
Regenerative braking is the only braking method where the kinetic energy of the mechanical load is converted back into electrical energy and fed back into the supply source. This process significantly increases the overall efficiency of electric traction systems.
EbтАЛ>V тАФ Condition for regenerative braking where back EMF exceeds supply voltage
PregenтАЛ=EbтАЛтЛЕIaтАЛтИТIa2тАЛRaтАЛ тАФ Power recovered during the process
During regenerative braking, the motor acts as a generator by running at a speed higher than its no-load speed (synchronous speed in AC machines). The back EMF EbтАЛ exceeds the supply voltage V, causing current to reverse direction and flow from the motor back into the supply grid. This acts as a retarding torque on the motor shaft, bringing the vehicle to a controlled stop while recovering energy.
Energy is returned to the source, reducing consumption.
The machine must operate at a speed greater than the synchronous speed.
Commonly used in electric trains and electric vehicles (EVs).
Requires complex control circuitry for voltage matching.
High energy efficiency
Reduced wear and tear on mechanical brakes
Requires a receptive grid or battery to accept current
Complex control and synchronization hardware
Electric locomotives
Electric and Hybrid Electric Vehicles (EV/HEV)
Elevators and Cranes
Dynamic braking dissipates energy as heat through resistors, whereas regenerative braking returns it to the grid.
Plugging involves reversing the phase sequence or polarity, causing intense heat and requiring high power to absorb the kinetic energy.
C is correct тАФ Regenerative braking allows the kinetic energy to be converted into electrical energy and returned to the supply system.
In competitive exams, always remember that 'Dynamic' braking dissipates energy as heat, while 'Regenerative' stores or returns it. If the grid cannot accept the energy, regenerative braking cannot be performed.