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Figure 6d – Azimuth Platform Edge Support Rollers (4 places)

Azimuth Drive: The azimuth drive consists of a stepper motor driving a belt which encircles the Azimuth Platform. The belt used is toothed neoprene belt that is reinforced with polyester fabric – it provides very positive and stiff control of the heliostat. A toothed pulley mounted the stepper motor shaft drives the belt. One step of the stepper motor provides 0.03 degrees of rotation in azimuth. Guides were added to support the belt and prevent vibration over the unsupported part of the belt between the drive gear and Azimuth Platform. The guides are lined with UHMW plastic to provide a low friction surface. A groove is routed in the edge of the Azimuth Platform to retain the drive belt. The drive belt is rigidly fastened to the North side of the Azimuth Platform to prevent any possibility of belt slippage – this allows approximately 270 degrees of

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November 24, 2002

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