21-G — high-power high-voltage induction motor up to 23,000 kW
21-G is a series of three-phase high-voltage squirrel-cage induction motors rated up to 23,000 kW (30,800 hp) in frames 400–900. It is the most powerful standard induction motor line of the manufacturer. Supplied from the grid or from a frequency converter.
- Power
- up to 23,000 kW (30,800 hp)
- Frames
- 400–900
- Type
- three-phase squirrel-cage induction
- Rotor
- welded cage of copper bars
Price, availability and lead time on request. We help with analogue selection, customs clearance and delivery.
Description
The 21-G series covers three-phase high-voltage induction motors for demanding industrial applications. Power reaches 23,000 kW (30,800 hp) and frames range from 400 to 900. The motors are designed to run both from the grid and from frequency converters and are engineered to international standards, including IEC and NEMA.
The frame is a welded steel fabrication, the rotor has a squirrel-cage winding of copper bars (welded copper cage), and the core is made of C5 electrical steel. The stator windings are insulated with an improved vacuum pressure impregnation (VPI) technology, which gives resistance to impulse overvoltages. During design, calculations of the electromagnetic field, heat transfer and improved ventilation are performed, and the core and frame are made using improved methods. The cage without brushes and slip rings is simple to operate.
According to the manufacturer, this design gives increased efficiency and power factor and good starting characteristics. The motor is compact, so it needs less floor space and a lighter foundation, has reduced noise and vibration and low operating costs. Motor production is based on a culture of quality and continuous improvement.
The 21-G series is intended for all applications and industries where a powerful drive is needed. The welded copper rotor cage and the C5 electrical steel core determine efficiency and starting properties, and VPI insulation withstands the impulse overvoltages that occur when operating from a frequency converter. Calculations of the electromagnetic field, heat transfer and ventilation make it possible to reduce the machine size and lower noise and vibration, while the smaller floor space and lighter foundation simplify installation. For individual requirements on the environment and performance, the manufacturer offers made-to-order versions.
Series 21 motors are combined with TMdrive medium-voltage frequency converters in complete variable-speed electric drives. They are used for high-power pumps, fans and compressors, mills and crushers, drives in the mining, oil and gas, metallurgical and cement industries, and for power plant auxiliaries (feed pumps, forced-draft fans and induced-draft fans). The starting method, speed control method and drive scheme are specified for the particular machine.
Technical specifications
| Power | up to 23,000 kW (30,800 hp) |
|---|---|
| Frames | 400–900 |
| Type | three-phase squirrel-cage induction |
| Rotor | welded cage of copper bars |
| Core | C5 electrical steel |
| Frame | welded steel |
| Insulation | VPI |
| Supply | from the grid or from a frequency converter |
| Standards | international standards (IEC, NEMA and others) |
Request a price and lead time
21-G — high-power high-voltage induction motor up to 23,000 kW. We reply within one business day.
Or email sales@usk.ua or call 044 339-50-20.
Questions and answers
What is the maximum power of the 21-G series and what are the frames?
Power reaches 23,000 kW (30,800 hp), frames from 400 to 900.
Can the motors be supplied from a frequency converter?
Yes, the motors are designed to run from the grid and from frequency converters. The series is combined with TMdrive medium-voltage converters in complete variable-speed electric drives.
What materials are the rotor, core and frame made of?
The rotor has a welded copper cage of bars, the core is made of C5 electrical steel, and the frame is a welded steel fabrication. The stator windings are insulated by vacuum pressure impregnation (VPI).
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