0195136047.pdf

780 BASIC CONTROL SYSTEMS

TABLE 16.1.4

Applications for the Electronic Control of Motors

PracticalSpeed

Typical

Range for a

Output

One- or

Variables

Range

Two-Quadrant

Governing

Converter

Motor

(kW)

Drive

Quadrants of Operation

Supply

Speed

Applications

Dc Drives

Single-phase

rectifier withcenter-tappedtransformer

Separately excited

or permanentmagnet dc

0–5

1:50

Quad 1 drivingQuad 2 dynamic or mechanical brakingReversal or armature connections or dual

converter for four-quadrant operation

120-V single-

phase ac

Armature

terminal pd

Field current

Small variable-speed

drives in general

Single-phase fully

controlledbridge rectifier

Separately excited

or permanentmagnet dc

0–10

1:50

Quad 1 drivingQuad 2 dynamic brakingReversal of armature connections or dual

converter for four-quadrant operation

240-V single-

phase ac

Armature

terminal pd

Field current

Processing machinery,

machine tools

Single-phase

half-controlledbridge rectifier

Separately excited

or permanentmagnet dc

0–10

1:50

Quad 1 drivingQuad 2 dynamic brakingReversal of armature connections for

four-quadrant operation

240-V single-

phase ac

Armature

terminal pd

Field current

Processing machinery,

machine tools

Three-phase

bridge rectifier

Separately excited

or permanentmagnet dc

10–200(10–50 forPM motor)

1:50

Quad 1 drivingQuad 2 dynamic brakingDual converter for regenerative braking

with four-quadrant operation

240-V to

480-Vthree-phaseac

Armature

terminal pd

Field current

Hoists, machine tools,

centrifuges,calender rollers

Three-phase

bridge rectifier

Separately excited

dc

200–1000

1:50

Quad 1 drivingQuad 2 dynamic brakingDual converter for regenerative braking

with four-quadrant operation

460-V to

600-Vthree-phaseac

Armature

terminal pd

Field current

Winders, rolling mills

Chopper (dc-to-dc

converter)

Separately excited

dc

1:50

Alternatives are quad 1 only; quads 1

and 2; quads 1 and 4; all four

600-V to

1000-V dc

Armature

terminal pd

Field current

Electric trains, rapid

transit streetcars,trolleys, buses,cranes