DC motors and generators, 250–35,000 hp (rolling mills, mine hoists, marine propulsion)
DC motors from Round Rock, Texas are designed for industrial and marine applications where high torque and adjustable speed are required: main drives of rolling mills, mine hoists and ship propulsion, as well as fans, Banbury mixers, extruders and special test
- Power
- 250 – more than 35,000 hp
- Armature diameter
- from 22 in (≈560 mm) to 12 ft (≈3.7 m)
- Speed range of rolling mill motors
- up to 4:1 at constant torque
- Insulation
- Thermalastic® / other systems
Price, availability and lead time on request. We help with analogue selection, customs clearance and delivery.
Description
DC motors from Round Rock, Texas are designed for industrial and marine applications where high torque and adjustable speed are required: main drives of rolling mills, mine hoists and ship propulsion, as well as fans, Banbury mixers, extruders and special test stands. The company has built DC machines since 1888; its achievements include the first electric motors at an American steel plant (1891), the first reversing mill drive and the first Leonard system for a dragline. Motors are produced with armature diameters from 22 inches to 12 feet and power from 250 to more than 35,000 hp. Rolling mill motors for the steel and aluminum industries run at low speeds at constant torque, with a speed range of up to 4:1, on continuous cold and hot strip mills and on reversing hot mills. Mine hoist motors lift loads and people from deep mines; they can be mounted cantilevered on a drum or on their own bearings. For ships, the company offers three classes of marine propulsion DC motors and generators for icebreakers, submarines, tugs, minesweepers, dredgers and research vessels; class 1 super-quiet motors have been supplied for US Navy ships. Special applications include drives for balancing machines, centrifuges and dynamometers. Design: main and interpoles are laminated for a fast response to changes in speed and load; full-length interpoles reduce reactance voltage and a compensating winding offsets armature reaction; stator connections are argon-arc welded, all conductors are copper, and the upper half of the stator is removable. Armature coils are made of laminated rectangular copper conductors with ground insulation and a multilayer varnish coating; end windings are banded with tensioned glass tape, and slot wedges provide heat removal. The commutator with V-shaped rings and a 'balanced spring' keeps its concentricity; bearings have spherical self-aligning seats; built-in ventilation, keyless coupling fits and removable shafts for continuous and rapid reversing duty are available. The main insulation is Thermalastic®. Large machines are manufactured and tested at the plant in Round Rock, Texas, USA, which has produced large DC motors since 1976, AC induction motors since 1977 and synchronous motors since 1978.
Technical specifications
| Power | 250 – more than 35,000 hp |
|---|---|
| Armature diameter | from 22 in (≈560 mm) to 12 ft (≈3.7 m) |
| Speed range of rolling mill motors | up to 4:1 at constant torque |
| Insulation | Thermalastic® / other systems |
| Design | laminated main and interpoles, compensating winding, copper conductors |
| Commutator | V-shaped ring with 'balanced spring' |
| Marine propulsion motors | three classes, class 1 super-quiet (US Navy) |
Request a price and lead time
DC motors and generators, 250–35,000 hp (rolling mills, mine hoists, marine propulsion). We reply within one business day.
Or email sales@usk.ua or call 044 339-50-20.
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