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风能系统对轴承有两个关键要求:高性能和恶劣条件下的高使用寿命

网址:www.nsk-zc.cn  2020-12-03  作者:admin    阅读:

风能系统对轴承有两个关键要求:高性能和恶劣条件下的高使用寿命。这些要求尤其适用于风力涡轮机容量仍在增加的海上风场。NSK最近开始为9.5MW涡轮机配套轴承,并且已经在为12MW级的海上涡轮机开发轴承。
Wind energy system has two key requirements for bearings: high performance and long service life under harsh conditions. These requirements are particularly applicable to offshore wind farms where wind turbine capacity is still increasing. The bearing for the NSW stage has recently been developed for the NSK turbine stage.
然而,对风力发电机轴承提出高要求的不仅仅是性能能力。在海上,由于风速很高,甚至更大的静载荷和动载荷作用在转子上,因此,整个传动系统负荷很大。在陆上风电机组中,主轴承承受的载荷高达1MN;在海上风电机组中,则更大。
However, it is not only performance capability that puts forward high requirements for wind turbine bearings. In the sea, because the wind speed is very high, even more static and dynamic loads act on the rotor, so the load of the whole transmission system is very large. In the onshore wind turbine, the load of the main bearing is as high as 1MN; in the offshore wind turbine, the load is greater.
鉴于此,对风力发电机轴承的使用寿命提出了越来越高的要求。对于陆上涡轮机,制造商传统上规定轴承的设计使用寿命必须为175000小时,相当于20年。然而,由于海上风能系统的高投资成本和接入困难,规定了25年的使用寿命,这是计入了极高动态负荷的一个重大挑战。
In view of this, higher and higher requirements are put forward for the service life of wind turbine bearings. For onshore turbines, the manufacturer has traditionally specified that the design life of the bearing must be 175000 hours, equivalent to 20 years. However, due to the high investment cost and difficult access of offshore wind energy systems, a 25 year service life is required, which is a major challenge to take into account extremely high dynamic loads.

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