3
Regenerative Drives
Most non-regenerative, variable-speed DC drives control current flow
to a motor in one direction. The direction of current flow is the same
direction as the motor rotation. Non-regenerative drives operate in
Quadrant 1, and also in Quadrant 3 if the drive is reversible (see Figure 2).
Motors must stop before reversing direction. Unless dynamic braking is
used, non-regenerative drives cannot oppose an overhauling load, and
cannot decelerate a load faster than coasting to a lower speed.
Regenerative drives operate in two additional quadrants: Quadrant 2 and
Quadrant 4. In these quadrants, motor torque is in the opposite direction of
motor rotation.
Regenerative drives can reverse a motor without contactors, switches,
brake resistors, or inhibit plugs. They can also control an overhauling load
and decelerate a load faster than it would take to coast to a lower speed.
Figure 2. Four Quadrant Operation
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Содержание RG501A
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