| 摘要 |
A back-up generator set operates on reserves of compressed air. A compressed air motor 5 is reversible to operate in a motor mode or a compressor mode to either drive or be driven by an electrical machine 1 which functions alternately as a generator or motor. When electricity is supplied to the motor it drives the compressor to gas pressurize the reservoir 6 and keep the reservoir at maximum pressure. When the power supply fails, the motor/ compressor 5 is switched automatically to motor mode to be powered by the compressed air from the reservoir and drive the generator 1 to provide back-up electrical power.
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