0195136047.pdf

16.2 FEEDBACK CONTROL SYSTEMS 781

Ac Drives

AC power

controller

Class D

squirrel-cageinduction motor

0–25

1:2

Quad 1 drivingQuad 4 plugging with source

phase-sequence reversal

Quad 3 drivingQuad 2 plugging

240-V three-

phase ac

Stator terminal

pd

Centrifugal pumps

and fans

Slip-energy

recovery system

Wound-rotor

induction motor

Up to 20,000

1:2

Quad 1 driving, with source

phase-sequence reversal

Quad 3 driving

Up to 5000-V

three-phaseac

Rotor terminal

pd

Centrifugal pumps

and fans

Voltage-source

inverter andadditionalconverters

Class B or C

squirrel-cageinduction motoror synchronousmotors

15–250

1:10

Quad 1 drivingQuad 2 regenerative braking, with

appropriate additional converters

Quad 3 drivingQuad 4 regenerative breaking

240-V to

600-Vthree-phaseac

Stator terminal

pd andfrequency

Group drives in textile

machinery andrunout tables

Current-source

inverter andadditionalconverters

Class B or C

squirrel cageinduction motor

15–500

1:10

Quad 1 drivingQuad 2 regenerative braking, with

inverter control signal sequencereversal

Quad 3 drivingQuad 4 regenerative braking

240-V to

600-Vthree-phaseac

Stator current

andfrequency

Single-motor dives,

centrifuges, mixers,conveyors, etc.

Current-source

inverter andadditionalconverters

Three-phase

synchronousmotor

Up to 15,000

1:50

Quad 1 drivingQuad 2 regenerative breaking, with

inverter control signal sequencereversal

Quad 3 drivingQuad 4 regenerative braking

Up to 5000-V

three-phaseac

Stator current

andfrequency

Single-motor drives,

processingmachinery of allkinds

Adapted from S. A. Nasar, Editor,

Handbook of Electric Machines,

McGraw-Hill, New York, 1987.