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The gearbox in a wind turbine must be able to withstand a range of harsh and variable conditions. Loads, stresses, vibrations and temperatures are constantly changing. Components in the gearbox, such as bearings, must be able to withstand such environment. The successful development and operation of the wind turbine gearbox involves design, modeling and testing; Condition monitoring and maintenance operations, as well as engineering and lubrication consulting.
1. Output torque range: 1000-80000 N.m
2. Gear Ratios: i=300-2000
3. Support: slew support (with flange mounted)
4. Electric Brake: DC and AC type
5. Output shaft: splined or with integral pinion; output shafts supported by heavy duty capacity bearings
6. Applicable motors: IEC electric motors
| Type | Nominal Output Torque (N.m ) | Peak Static Output Torque (N.m ) | Ratio (i) |
| EP700L | 1000 | 2000 | 297--2153 |
| EP701L | 2000 | 4000 | 297--2153 |
| EP703AL | 2500 | 5000 | 278--1866 |
| EP705AL | 5000 | 10000 | 278--1866 |
| EP706BL4 | 8000 | 15000 | 203--2045 |
| EP707AL4 | 12000 | 25000 | 278--1856 |
| EP709AL4 | 18000 | 30000 | 278--1856 |
| EP711BL4 | 35000 | 80000 | 256--1606 |
| EP710L4 | 25000 | 50000 | 329--1420 |
| EP711L4 | 35000 | 80000 | 256--1606 |
| EP713L4 | 50000 | 100000 | 250--1748 |
| EP715L4 | 80000 | 140000 | 269--1390 |
Application of slewing drive gearbox
The main function of the gearbox in the wind power system is to adjust the speed and improve the efficiency. In order for the compact generator to work properly, certain components must move very quickly because the voltage generated depends on the power generated by the wind turbine. However, due to the centrifugal force, the turbine blade itself cannot move very fast, so a gearbox is required to increase the rotation speed of a slow turbine to a faster generator speed. One of the alternatives to gearboxes is large generators with permanent magnets, but they are much more expensive than wind turbine gearboxes.
There are many types of gearboxes or reducers, but there are only a few types of gearboxes dedicated to wind turbines (generators). Although their design and operating principles are different, their functions are mostly the same. Among them, one of the most commonly used wind power scenarios is the yaw pitch gearbox, which uses a multi-stage planetary structure.
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