Q. What is the operation performed in 2nd quadrant of the 4 quadrant Operation ? (NESCOM TEST 2018)
a) Forward Braking
b) Forward motoring
c) Reverse motoring
d) Reverse braking
Explanation:
Four Quadrant Operation of any drives or DC Motor means that the machine operates in four quadrants. Followings are the four quadrants of operations
Forward Braking
Forward motoring
Reverse motoring
Reverse braking.
A motor operates in two modes that are Motoring and Braking. A four quadrant drive difinition is below…
A motor drive capable of operating in both directions of rotation and of producing both motoring and regeneration is called a Four Quadrant variable speed drive.
In motoring mode, the machine works as a motor and converts the electrical energy into mechanical energy, supporting its motion.
Whereas In braking mode, the machine works as a generator and converts mechanical energy into electrical energy and as a result, it opposes the motion.
In the 1st quadrant power developed is positive and the machine is working as a motor supplying mechanical energy. The I (first) quadrant operation is called Forward Motoring. II (second) quadrant operation is known as Forward Braking. In this quadrant, the direction of rotation is positive, and the torque is negative, and thus, the machine operates as a generator developing a negative torque, which opposes the motion.
III (third) quadrant operation is known as the reverse motoring. The motor works, in the reverse direction. Both the speed and the torque have negative values while the power is positive. IV (fourth) quadrant, the torque is positive, and the speed is negative. This quadrant corresponds to the Reverse braking.
Compressor, pump and fan type load requires operation in the I quadrant only. As their operation is unidirectional, they are called one quadrant drive systems. Hoist drives use a four-quadrant operation.
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