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Capstone Turbine Corporation Model C65 Hybrid UPS User’s Manual 2.2.1. Microturbine Engine The microturbine engine is a combustion turbine that includes a compressor, combustor, turbine, generator, and a recuperator. The rotating components are mounted on a single shaft supported by patented air bearings and spin at up to 96,000 RPM. The permanent magnet generator is cooled by the airflow into the microturbine. The output of the generator is variable voltage, variable frequency AC. The generator is used as a motor during start-up and cooldown cycles. The key mechanical components that make up the Capstone Microturbine engine are shown in Figure 3. Figure 3. Typical C65 Hybrid UPS Microturbine Engine (Cutaway View) 2.2.2. Air Bearings The microturbine utilizes gas foil bearings (air bearings) for high-reliability, low maintenance, and safe operation. This allows fewer parts and the absence of any liquid lubrication to support the rotating group. When the microturbine is in operation, a gas film separates the shaft from the bearings and protects them from wear. 2.2.3. Digital Power Electronics Digital power electronics control the microturbine system operation and all subsystem operations. The digital power electronics change the variable frequency AC power from the generator to DC voltage, and then to constant frequency AC current. Page 18 of 71 400027 Rev B (August 2013) Capstone reserves the right to change or modify, without notice, the design, specifications, and/or contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction.PDF Image | Capstone MicroTurbine Model C65 Hybrid UPS User's Manual
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