What are two-quadrant operations?
A two-quadrant motor operation is where speed is on the horizontal axis and torque is on the vertical axis.
A simple example for two-quadrant drive is a DC motor in single quadrant operation. Due to an additional switch, the motor reverses and then due to this inversion, the motor operates in two quadrants. However, if we do not want to reverse the operation or if it is unnecessary, then the drive can work in two quadrants by adding regenerative braking.
What is a four-quadrant motor control?
Basing the concepts of a motor, depend on the four distinct areas of operation on operation direction. Two of the quadrants represent the torque application motion direction and the other two have torque applied on the opposite direction.
Motors have two types of energy conversions that take place, electrical to mechanical and mechanical to electrical. These allow the motor to operate in all four quadrants through regeneration. The use of four-quadrant motor control is beneficial since DC motors can run better than other machines. This helps in saving the production costs and reducing the long-term profit losses.
Finally, the differences between two-quadrant and four-quadrant motor operations are as follows:
- Not every motor operates on both two-quadrant and four-quadrant controls; there are some motors that operate on two-quadrant while some that are designed to work specifically on four-quadrant.
- Four-quadrant motors are more efficient than two-quadrant and even more energy-saving.
- In two-quadrant motors, there is only forward and reverse motoring while in four-quadrant motors, there is forward and reverse regeneration.
- As there is regeneration in four-quadrant motors, thus energy conversion takes place as generator converts mechanical energy into electrical but this is not done in two-quadrant.
- Two-quadrant operation is a conventional type of operation in motors but four-quadrant means, it is for specific purposes and not for regular functions.
- In two-quadrant operation, which one needs an external switch to reverse the operation while in four-quadrant operation, no external switching is required.
These are some of the differences in both the quadrant operation. Both operations need to be in different areas of designing and functioning. Based on the field of deployment, the pros and cons for each of them allow analyzing and choices can be made.