Device for prevention of power interruptions

A method for preventing power to a DC bus wherein:

• supporting a flywheel for rotation on a bearing system in a drag reducing internal atmosphere inside a sealed container;
• accelerating and decelerating said flywheel for storing and retrieving energy with an integral brushless permanent magnet excited motor/generator;
• delivering synchronous power to armature coils of said motor/generator by a closed loop operated synchronous inverter to accelerate said motor/generated;
• and
• delivering unregulated voltage power to said DC bus from said motor/generator through a rectifier that connects said armature coils of said motor/generator to said DC bus during an interruption of primary utility power;
• whereby, said unregulated voltage of said DC bus falls as said flywheel slows during discharge of useable energy therefrom to said DC bus, and said device increases the amount of said usable energy delivered to said DC bus during a utility power interruption by the combination of having a low voltage drop in said armature coils of said motor/generator and by said flywheel having sufficient inertia to reduce the rate of decay of the back emf of said motor/generator.

A device for preventing power interruptions to a DC bus normally supplied by primary utility power, comprising:

• a flywheel supported on bearings for rotation inside a chamber having a drag reducing atmosphere within a container, said flywheel having a moment of inertial about said axis of rotation the is less than 4.5 V I T/w2, where V is voltage in volts normally supplied to said said DC bus during normal operation of said primary utility power, and I is current in amps through said DC bus during normal operation of said primary utility power, and T is time in seconds during which said device is capable of supplying useable power to said DC bus, and w, in radians per second, is the normal fully charged operating speed of said flywheel;
• an integral brushless permanent magnet excited motor/generator for accelerated and decelerated said flywheel for storing and retrieving energy, said motor/generator having armature coils with an electrical resistance per phase that is less than 0.15 (V/I), where V is normal DC bus voltage during normal operation of said primary utility power, in volts, and I is normal current through said DC bus during normal operation of said primary utility power, in amps;
• a closed loop operated synchronous inverter for delivering synchronous electrical power to armature coils of said motor/generator for accelerating said motor/generator;
• a rectifier connecting said armature coils of said motor/generator to said DC bus;
• whereby, upon an interruption of primary utility power, said motor/generator supplies unregulated voltage power to said DC bus through said rectifier, and said voltage of said unregulated voltage power to said DC bus falls as said flywheel slows during discharge of useable energy from said flywheel through said motor/generator to said DC bus, said device delivering an amount of usable energy to said DC bus during a utility power interruption that is maximized by the combination of a low voltage drop in said armature coils, and by said flywheel having sufficient inertia to reduce the rate of decay of the back emf of said motor/generator.