Dc motor governor two quadrant and four quadrant operation difference?

Dc motor governor two quadrant and four quadrant operation difference?

Dc motor governor two quadrant refers to irreversible, generally expressed by 2Q. It can only work in the rectification area.

Dc motor governor four quadrant refers to reversible, generally expressed by 4Q. The thyristor rectifier can work in the rectifier area, but also can invert and feed the electricity generated by the motor back to the grid. Fast braking is realized.

Four quadrants: if the torque and speed of the motor are respectively taken as horizontal and vertical coordinates to form a coordinate system, then the four quadrants in the coordinate system represent the four kinds of industries and mines in which the motor works: positive force lifting, negative force lifting, positive force lowering, negative force lowering;

The direction of speed of DC motor is determined by the direction of armature voltage and magnetic field. General DC speed regulating device, the direction of the magnetic field is constant, that is, the direction of torque is controlled by the direction of armature voltage.

If your DC motor needs to be able to operate in four quadrants, then you need a DC governor to be able to adapt to the motor four quadrant operation conditions, you have to choose a four quadrant governor. For the four-quadrant governor, the thyristor is paralleling forward and backward to form three full control Bridges, so a total of 12 thyristors are used to produce different armature voltage and current directions. If your motor only needs to operate in one direction and torque direction, then you can use a single quadrant.

So the use of single quadrant or four quadrant DC motor governor, depends on your motor operating conditions.