| 摘要 |
A large dish member for use as a solar collector, radar antenna or the like is mounted on a tripod structure on a first set of bearings which permit rotation about a polar or azimuth axis, and a second set of bearings which permit rotation about an elevation axis. Drive about the elevation axis is achieved by means of a linear actuator with elevation position being sensed by means of a position transducer such as a selsyn. Drive about the polar or azimuth axis is achieved by means of two motors, one for slow drive, the other for fast drive, both of these motors being coupled through a timing belt drive and worm gear reducer to a drive sprocket. The drive sprocket engages a chain which is welded to the rim of an arcuate spoked drive member in the form of a wheel segment, which is fixedly attached to the dish member and mounted for rotation on the support structure. A position selsyn is provided to sense azimuthal or polar position. The sprocket wheel thus engages and drives the chain and the arcuate drive member to which it is attached about the polar axis, this drive member carrying the dish along with it, while the linear actuator is used to raise and lower the dish in elevation.
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