In order to reduce the maintenance cost, it is necessary to continuously monitor the temperature of the large wind power station with high-power motor and gear box. The same applies to large synchronous machines. Temperature information is very valuable, with this information, we can take timely measures, such as when the temperature anomaly, we can turn off the fan or to slow down the fan. The information can also be uploaded to the central monitoring centre to gather information on the use of the fans.