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An uninterruptible rotating power supply incorporates a sensor of motion and distortion of a stator during interruptions of normal power supply acting on the stator within a synchronous motor, which normally rotates an alternator supplying power to the electric load. When a distortion (unacceptable

An uninterruptible rotating power supply incorporates a sensor of motion and distortion of a stator during interruptions of normal power supply acting on the stator within a synchronous motor, which normally rotates an alternator supplying power to the electric load. When a distortion (unacceptable normal power supply) is sensed, transient power is supplied by a flywheel and hydraulic motor driven by hydraulic fluid stored under pressure in a reservoir. Long term emergency power is supplied by a diesel engine driving the generator or hydraulic pump. The dual supply of transient power allows redundancy for large amperage critical applications or downsizing of flywheel to minimum levels in less critical applications or where a portion of the load is not critical.

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An uninterruptible electric power device, supplying electric power to a critical electric load, which comprises: a motor-generator having a rotor and a stator; an alternator having a rotating member attached to said rotor, said alternator supplying electric power to said critical electric load; mean

An uninterruptible electric power device, supplying electric power to a critical electric load, which comprises: a motor-generator having a rotor and a stator; an alternator having a rotating member attached to said rotor, said alternator supplying electric power to said critical electric load; means for supplying a primary electric motive power to said motor-generator sufficient to rotate said alternator when said primary electric power is within an acceptable range of properties; a switch capable of interrupting the primary electric power to said motor-generator; means for sensing a defect in said primary electric power outside of said acceptable range of properties; means, responsive to said means for sensing, for actuating said switch, interrupting said primary electric power to said motor-generator; a fluid driven hydraulic motor engaging and capable of rotating said rotating member of said alternator; means for supplying pressurized fluid to said hydraulic motor, said fluid supply capable of rotating said hydraulic motor and alternator for a first period of time; a non-electrically powered engine engaging and capable of rotating said alternator supplying said electrical load for a second period of time longer than said first period; and means for actuating said interrupted switch to the closed position when said primary electric power has returned to within said acceptable limits.