DSQC562 3HAC16014-05  ABB  Basis unit

Drive applications can be divided into three main categories according to speed and torque. The most common AC drive application is a single quadrant application where speed and torque always have the same direction, ie, the power flow (which is speed multiplied by torque) is from inverter to process. These applications are typically pump and fan applications having quadratic behaviour of load torque and thus often called variable torque applications. Some single quadrant applications such as extruders or conveyors are constant torque applications, ie, the load torque does not inherently change when speed changes.

The second category is two-quadrant applications where the direction of rotation remains unchanged but the direction of torque can change, ie, the power flow may be from drive to motor or vice versa. The single quadrant drive may turn out to be two quadrants for example if a fan is decelerated faster than mechanical losses could naturally achieve. In many industries also the requirement for emergency stopping of machinery may require two-quadrant operation although the process itself is single quadrant type.

The third category is fully four-quadrant applications where the direction of speed and torque can freely change. These applications are typically elevators, winches and cranes, but many machinery processes such as cutting, bending, weaving, and engine test benches may require repetitive speed and torque change. One can also mention single quadrant processes where the power flow is mainly from machinery to inverter such as in a winder or an uphill to downhill conveyor.

It is commonly understood that from the energy saving point of view the AC motor combined with inverter is superior to mechanical control methods such as throttling. However, less attention is paid to the fact that many processes may inherently include power flow from process to drive, but how this braking energy could be utilised in the most economical way has not been considered.

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