Four Quadrant Operation Of DC motor

Four Quadrant Operation Of DC motor

There are four mode of operation

1) forward motoring2) forward braking 3) reverse motoring4) reverse braking

The dc motor can operate in either of these mode.

Four quadrant operation of dc motor can be use for variable speed application.DC motor speed control is easy and smooth.DC motor can be use for both motoring and generating purpose.Direction of rotation of dc motor can be change by reversing the terminal polarity.So it can be use for clockwise and anti clockwise purpose.In first and third quadrant it act as motor in second and fourth quadrant it act as generator.Speed is varied by varying voltage level and direction can be control by changing polarities.The torque of a separately excited dc motor is directly proportional to the armature current .We can control positive or negative torque by controlling voltage.There are two e.m.f. one is terminal voltage and other is back e.m.f. .