CRRC 4.XMW Air-to-Air Cooled Double Fed Induction Generator

CRRC 4.XMW air-to-air cooled doubly fed Induction generator is a high-power, high-efficiency power generation solution matched for the 4.X MW platform doubly fed wind turbine unit, delivering a rated output power range of 3600 – 4200 kW, a rated stator voltage of 690 V, and a rated rotating speed of 1200 rpm, paired with a 6-pole structure and an H-class insulation system, with a center height of 630 mm. It adopts air-to-air cooling mode with IP54 protection grade for stator and IP23 for slip ring chamber, featuring a rotor open-circuit voltage of 1850V±1.5% and a rated efficiency of ≥97%.
This generator connects the drive-end rotating shaft to medium-speed gearboxes via couplings to receive mechanical power. Its stator is directly linked to the grid, while the rotor connects to the grid through four-quadrant converters. It operates stably within a speed range of ±38% of synchronous speed and realizes flexible grid power factor adjustment. Equipped with patented self-ventilation structure, the unit features low internal wind resistance and large air volume to resolve temperature rise challenges caused by high power loss under air-to-air cooling, granting abundant temperature rise margin and extended service life. Form-wound coils and polyimide corona-resistant mica insulation on rotors withstand converter impulse voltages; insulated end shields and ground brush design mitigate bearing damage from shaft voltage and current, while split slip ring chambers with independent ventilation fans isolate carbon powder pollution and discharge dust efficiently. It maintains low noise and reliable performance amid variable wind farm conditions.
As a mature doubly fed design with standard winding layout, it seamlessly integrates with mainstream four-quadrant wind power converter technologies. The innovative air-to-air cooling design eliminates the need for an independent water cooling system, cutting overall unit investment cost, and the whole product has passed CGC certification to guarantee reliable grid compatibility and long-term operational stability.
We provide full life-cycle support for the 4.XMW AAC doubly fed Induction generator, including equipment supply, on-site installation and commissioning, maintenance training, spare parts provision, and ongoing technical troubleshooting services.

Advantages of CRRC 4.XMW Air-to-Air Cooled Double Fed Induction Generator

Featuring patented technology suitable for self-ventilated structures, the motor boasts low internal air resistance and high airflow, resolving the temperature rise issue caused by the contradiction between high losses and insufficient cooling in high-power motors. This results in a large temperature rise margin and long lifespan.
The stator and rotor coils utilize molded windings; the rotor employs a polyimide film corona-resistant mica insulation structure, capable of withstanding certain pulse voltages from the frequency converter; H-class insulation structure with vacuum pressure impregnation ensures high reliability.
The use of insulated end caps and a grounding brush design significantly reduces damage to the bearings from shaft voltage and current; the split slip ring chamber structure isolates the motor from carbon dust contamination, improving reliability.
The slip ring chamber uses an independent fan for ventilation and cooling, and its special structure facilitates carbon dust removal, enhancing motor operational reliability.
The product has passed CQC certification.

Technical Specifications

Rated Power:	3600 – 4200 kW
Rated Speed:	1200 rpm
Rated Frequency:	50 Hz
Shaft Center Height:	630 mm
Rated Stator Voltage:	690 V
Rated Efficiency:	≥ 97 %
Number of Poles:	6
Insulation Class:	H
Open-Circuit Rotor Voltage:	1850 V ± 1.5 %
Protection Class:	IP54 / IP23
Cooling Method:	Air-to-Air Cooled

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Product Name	Rated Power	Rated Speed	Rated Voltage	Rated Current	Rated Frequency	Rated Efficiency	Protection Class	Cooling Method	Weight
1.5MW Generator	1560 kW	1800 rpm	690 V / 420 V	1090 A / 390 A	50 Hz	≥97%	IP54/IP23	Air-to-Air + Water Jacket	7200 kg
2.5MW Generator	2560 kW	1720 rpm	690 V	1877 A	50 Hz	N/A	IP54	IC666	8100 kg
3.3MW Generator	3400 kW	1720 rpm	690 V	2493 A	50 Hz	N/A	IP54	IC616	10000 kg
4.2MW Generator	4200~4300 kW	1720~1780 rpm	1140 V	637 A	50 Hz	N/A	N/A	IC2X	N/A
6.4MW Generator	6400 kW	1720 rpm	1140 V	962 A	50 Hz	N/A	N/A	IC26	11500 kg
1.5MW AAC Generator	1560 kW	1800 rpm	690 V / 420 V	1090 A / 390 A	50 Hz	≥97%	IP54/IP23	Air-to-Air Cooling	7200 kg
2MW AAC Generator	2150 kW	1200 rpm	690 V / 401 V	1506 A / 624 A	50 Hz	≥97%	IP54/IP23	Air-to-Air Cooling	9500 kg
2.XMW AAC Generator	2280~2600 kW	1650~1820 rpm	690 V	N/A	50 Hz	≥96.5%	IP54/IP23 (Slip Ring Chamber)	IC616	7500 kg
4.XMW AAC Generator	3600~4200 kW	1200 r/min	690 V	N/A	50 Hz	≥97%	IP54/IP23	Air-to-Air Cooling	N/A
1.5MW Plateau AAC Generator	1567 kW	1735 rpm	690 V / 300 V	1138 A / 459 A	50 Hz	≥97%	IP54/IP23 (Slip Ring Chamber)	Air-to-Air Cooling	7600 kg
2MW Plateau AAC Generator	2150 kW	1800 rpm	690 V / 389 V	1506 A / 590 A	50 Hz	≥97%	IP54/IP23	Air-to-Air Cooling	7800 kg
2.5MW Plateau AAC Generator	2600 kW	1200 rpm	690 V / 415 V	1822 A / 665 A	50 Hz	≥97%	IP54/IP23 (Slip Ring Chamber)	Air-to-Air Cooling	11300 kg
2.5MW Low Temp AAC Generator	2600 kW	1200 rpm	690 V / 415 V	1820 A / 670 A	50 Hz	97%	IP54/IP23	IC666	11900 kg
2MW AWC Generator	2150 kW	1755 rpm	690 V / 312 V	1540 A / 614 A	50 Hz	≥97%	IP54/IP23	Air-to-Water Cooling	6500 kg
3.XMW AWC Generator	3100~3750 kW	700~1380 rpm	690 V	N/A	50 Hz	≥97%	IP54/IP23 (Slip Ring Chamber)	IC86W	12500 kg
5MW AWC Generator	5300 kW	1200 rpm	6300 V	406 A	50 Hz	≥97%	IP54/IP23 (Slip Ring Chamber)	Air-to-Water Cooling	17600 kg
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CRRC 4.XMW Air-to-Air Cooled Double Fed Induction Generator
Rated Power Range	3600 – 4200 kW	Rated Speed	1200 rpm
Rated Frequency	50 Hz	Shaft Center Height	630 mm
Number of Poles	6	Stator Rated Voltage	690 V
Rated Efficiency	≥ 97 %	Power Factor	0.95ind – 1 – 0.95cap
Rotor Open-circuit Voltage	1850 V ± 1.5 %	Cooling Method	Air-to-Air Cooled
Insulation Class	H	Protection Grade	IP54 / IP23
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Squirrel cage wind turbine generator

Product Model

Rated Power

Rated Speed

Rated Frequency

Center Height

Number of Poles

Stator Rated Voltage

Stator Rated Current

Stator Winding Connection

Rated Efficiency

Power Factor

Insulation Class

Cooling Method

Motor Weight

Protection Class

2.5MW Generator

2650 kW

1550 rpm

51.4 Hz

630 mm

750 V

2307 A

Delta (△)

≥97%

≥0.88

Air-to-Air Cooled

8350 kg

IP54

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Permanent magnet wind generator

Product Model	Rated Power	Rated Voltage	Number of Phases	Protection Class	Rotational Speed	Rated Current	Weight
7.6MW Semi-direct PMSG	7600 kW	690 V	N/A	N/A	278 rpm	3347 A	48.5 t
3.6MW Semi-direct PMSG	3830 kW	690 V	3	IP54	350 rpm	N/A	17.5 t
3MW Integrated Semi-direct PMSG	3200 / 3400 / 3620 kW	710 V	3	IP54	480 / 526 / 550 rpm	N/A	12 t
1.5MW Direct-drive PMSG	1580 kW	720 V	6	IP23	16.6 – 20.5 rpm	720 A	44 t
2.0MW Direct-drive PMSG	2120 kW	720 V	2×3	IP54	14 rpm	2×1006 A	49 t
2.5MW Direct-drive PMSG	2650 kW	690 V	2×3	IP54	13.5 – 16 rpm	2×1394 A	53 t
3.0MW Direct-drive PMSG	3350 kW	690 V	2×3	IP54	12.2 – 13.9 rpm	2×1800 A	69 t
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General Infomation of CRRC Stator Coils for Wind Turbines Above 1.5MW
Product Model	7MW	Stator slots	192
Rated voltage	1400 V	Winding pitch	1-11
Turns per coil	6	Weight	4.05 kg
Scale	1:01
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Technical Requirements

When the voltage phase sequence of the three-phase power supply is the same as the order of the terminal letters U, V, W on the motor terminals, the motor shall rotate counterclockwise when viewed from the shaft extension end; the bearing grease shall be BEM41-141, the lubrication cycle of the front and rear bearings is 0.5g or a similar amount of lubricating oil to be added every 8 hours, and the specific operation shall refer to the centralized lubricator operation manual.

Wind Power (Business Layout)

Wind Power (Market Situation)

As of December 2022, Yongji Electric has provided the wind power market with over 50,000 wind turbines (103GW), distributed across more than 1,800 wind farms both domestically and internationally. It comprehensively covers all wind power installation areas in China, accounting for 37% of the total number of wind turbines in operation, ranking first in the domestic market share.