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An uninterruptible power supply (UPS) system supplies electric power to computers, medical apparatus or other critical loads when a primary power supply fails. The UPS system includes an electrical machine drivingly connected to a turbine which can be rotated by a motive fluid from a fluid supply. T

An uninterruptible power supply (UPS) system supplies electric power to computers, medical apparatus or other critical loads when a primary power supply fails. The UPS system includes an electrical machine drivingly connected to a turbine which can be rotated by a motive fluid from a fluid supply. The electrical machine can be a dual purpose electrical machine (a motor/generator) or a two unit machine (one motor and one generator in a single housing or in separate housings) drivingly connected to a turbine which can be rotated by a motive fluid supply. When power is supplied from the primary power supply to the critical load, the electrical machine acts as a motor to rotate the turbine, and energy is stored by the turbine rotor in the form of rotational momentum. When power from the primary power supply fails, the rotational momentum of the turbine rotor initially rotates the electrical machine which acts as a generator to provide power to the critical load. If the power loss or failure is extended, the turbine motor is driven by combustion products, steam, compressed gases or other motive fluids to maintain the rotary motion of the turbine and the generator.

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[ We claim:] [1.]1. Uninterruptible power supply apparatus for receiving electric power from a primary power source and for supplying electric power to a critical load when the primary power source fails, said apparatus comprising:a rotary electrical machine having a machine rotor, said electrical m

[ We claim:] [1.]1. Uninterruptible power supply apparatus for receiving electric power from a primary power source and for supplying electric power to a critical load when the primary power source fails, said apparatus comprising:a rotary electrical machine having a machine rotor, said electrical machine being electrically connectable to said primary power source and being operable in a motor mode when it receives electric power from the primary power source, said rotary electrical machine also being operable in a generator mode to supply electric power to a critical load;a turbine having a rotor and a normally inactive fluid supply which, when active, supplies a flow of motive fluid to said rotor to rotate said turbine rotor;said turbine rotor being drivingly connected to said machine rotor;said apparatus being operable in a standby mode, a transitional mode and an active mode;said electrical machine, when said apparatus is in standby mode, being in its motor mode to rotate said turbine rotor which stores kinetic energy as rotational momentum;said electrical machine being in its generator mode when the apparatus is in its transitional mode, said rotational momentum of said turbine rotor being operable to rotate said electrical machine rotor when the apparatus is in its transitional mode to generate electric power which is supplied to a critical load;said fluid supply being active when said apparatus is in its active mode to rotate the turbine rotor which rotates said electrical machine rotor to generate electric power for the critical load.