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|1. (WO2018105590) WINDMILL DRIVE DEVICE, WINDMILL DRIVE DEVICE UNIT, AND WINDMILL|
|Title:||WINDMILL DRIVE DEVICE, WINDMILL DRIVE DEVICE UNIT, AND WINDMILL|
[Problem] To quickly and accurately detect abnormalities at a windmill drive device. [Solution] A windmill drive device 10 that has a drive device main body 20 and a sensor 40. The drive device main body 20 is arranged on one structure of a mobile section of a windmill 101. The drive device main body 20 has an engagement part 24a that engages a ring gear 107 that is arranged on another structure of the mobile portion of the windmill. The sensor 40 measures changes in the arrangement of the drive device main body 20 on the one structure.