What is a REGENERATIVE DC Drive and can be used instead servo Motors?

REGENERATIVE DC Drives are actually two Drives in one unit using SCRs; one of them moves the DC Motor in one direcction, the other one moves the DC Motor in the oposite direction, that explain their price,  and can be used instead of servo drives & motors in most of appilications, and they are cheaper than Servo Equipment.

REGENERATIVE Speed Controls for 1/4 ~ 7.5HP - 90V/180V DC Motors with PM or Shunt Wound Field; Control Speed/Torque and Rotation direction electronically. 

Regenerative Drives are used in many applications where the Motor needs to move in both directions without Electromechanical Contactors; Plus pumping back power to the Power Company during deceleration or when stopping, and save energy (Money).

Its 4 quadrants operation allows the motor to operate in both directions at full power, REGENERATIVE DC DRIVES CAN REPLACE SERVO-DRIVES IN MAY APPLICATIONS.