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1997年的风机力市场上出现了兼具无齿轮、变速变浆距等特征的风力机, 这些高产能、运行维护成本低的先进机型有E-33、E-48、E-70等型号，容量从330kW至2MW，由德国 ENERCON GmbH公司制造，它们的制造始于1992年[4]。2000年瑞典ABB公司研制成功了3MW的巨型可变速风力发电机组，其中包括永磁式转子结构的高压风力发电机Windformer，容量3MW、高约70m、风扇直径约90m[5,6]。2003年在Okinawa电力公司开始运行的MWT-S2000型风力机是日本三菱重工首度完全自行制造的2MW级风机，采用小尺寸的变速无齿轮永磁同步电机，新型轻质叶片[12]。下表为部分风力机制造商所申请的直驱式风力机的相关专利：
|
专利号 |
专利名称 |
申请人 |
申请日/公开日 |
同族专利 |
| DE4437972 |
Permanent magnet excited wind power generator |
SIEMENS AG (DE) |
1996.4.25/1994.10.24 |
|
| EP0864748 |
Low speed gearless wind turbine |
JEUMONT IND (FR); FRAMATOME SA (FR) |
1998.9.16/1998.3.10 |
WO9840627 US6285090 FR2760492 CA2280935 EP0864748 |
| WO03008802 |
METHOD AND DEVICE FOR SPEED-VARIABLE POWER ELECTRONIC ADJUSTMENT OF A GEARLESS WIND POWER PLANT |
ABB RESEARCH LTD (CH);; DATTA RAJIB (DE);; BERNET STEFFEN (DE);; REINOLD HARRY (DE) |
2003.1.30/2002.7.16 |
EP1407141 US2004119292 DE10134883 |
| US2004119292 |
Method and configuration for controlling a wind energy installation without a gearbox by electronically varying the speed |
ABB research ltd. |
2004.6.24/2003.12.11 |
WO03008802 EP1407141 DE10134883 |
| US2003209912 |
Wind power electrical generating system |
BADGER RANDALL (US) |
2003.11.13/2003.5.6 |
|
| RU2211950 |
WIND SET WITHOUT REDUCTION GEAR |
KIRSANOV ALEKSANDR VIKTOROVICH |
2003.9.10/2001.11.6 |
|
| EP1394406 |
Gearless wind turbine with multiple generator |
KLINGER FRIEDRICH PROF DR-ING (DE) |
2004.3.3/2003.8.22 |
DE10239366 |
| WO2005019642 |
WIND TURBINE BLADE PITCH CHANGE BY MEANS OF ELECTRIC STEPPING MOTOR |
GEN ELECTRIC (US);; HAGEDORN RALF (DE) |
2005.3.3/2003.8.21 |
|
| SU1772409 |
WIND PLANT WITHOUT REDUCTION GEAR |
UFIMSK AVIATSION INST (SU) |
1992.10.30/1990.5.7 |
|
| DE2533805 |
Wind power driven generators-in wgich several direct driven units are electrically connected together have gearless connection between wind vanes and generators |
1977.3.24/1975.7.29 |
