Wound-rotor asynchronous motors, 100–10,000 hp (up to 15,000 hp), up to 13.8 kV
Wound-rotor motors are asynchronous machines that allow smooth acceleration of machinery with a high moment of inertia and of heavy loads.
- Power
- 100–10,000 hp (website); 5–15,000 hp (brochure)
- Voltage
- 220 V – 13.8 kV
- Speed
- 300–3600 rpm
- Frequency
- 50 / 60 Hz
Price, availability and lead time on request. We help with analogue selection, customs clearance and delivery.
Description
Wound-rotor motors are asynchronous machines that allow smooth acceleration of machinery with a high moment of inertia and of heavy loads. They develop high starting torque from standstill at low starting current, and the heat generated during starting is dissipated in external resistor banks or liquid rheostats, which ensures a long motor service life. The distinctive feature of the machine is its rotor: instead of squirrel-cage bars it has a set of insulated coils, similar to the armature winding of a DC machine, connected to slip rings on which carbon-graphite brushes slide. External resistances, a resistor bank or a liquid rheostat, are connected to the rotor through the brushes. By varying the resistance from practically a short circuit to infinitely large, the mechanical characteristic can be changed: a high torque can be maintained at low starting current, and the speed of pumps, for example, can be regulated. According to the website, the motors are produced in powers from 100 to 10,000 hp; the brochure specifies a range from 5 to 15,000 hp, voltages from 220 to 13,800 V and speeds from 300 to 3600 rpm depending on power, for 50 and 60 Hz networks. Characteristic solutions: brushes selected for operation under variable load; high-quality steel shafts; slip rings and brush holders rated for continuous duty; on request, a brush lifting and ring short-circuiting device. Together with the motor, the company can supply a liquid rheostat or a six-step resistor bank. Applications: ball and cement mills, shredders (a separate brochure covers motors for automotive shredders), speed-controlled pumps, crushers and conveyors. The motors have the Thermalastic® insulation system and are manufactured as part of the company's custom asynchronous motor programme. 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 | 100–10,000 hp (website); 5–15,000 hp (brochure) |
|---|---|
| Voltage | 220 V – 13.8 kV |
| Speed | 300–3600 rpm |
| Frequency | 50 / 60 Hz |
| Slip rings and brush holders | for continuous duty |
| Options | brush lifting and ring short-circuiting device; liquid rheostat, 6-step resistor bank |
| Starting | high starting torque at low starting current |
Request a price and lead time
Wound-rotor asynchronous motors, 100–10,000 hp (up to 15,000 hp), up to 13.8 kV. We reply within one business day.
Or email sales@usk.ua or call 044 339-50-20.
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