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US6720674: Device for prevention of power interruptions

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Filing Information

Inventor(s) Christopher W. Gabrys ·
Assignee(s) Indigo Energy, Inc. ·
Attorney/Agent(s) J. Michael Neary ·
Primary Examiner Gregory J. Toatley, Jr. ·
Application Number US10096602
Filing date 03/12/2002
Issue date 04/13/2004
Predicted expiration date 07/14/2022
Patent term adjustment 124
U.S. Classifications 307/68  · 318/161  ·
International Classifications --
Kind CodeB1
International Classifications 307 85- 87 · 318800-802 · 307 68 · 307 46 · 307 48 · 307 64 · 318161 · 318254 · 318439 · 318138 · 318434 ·
Related U.S. Application DataThis is related to U.S. Provisional Application No. 60/275,252 filed on Mar. 12, 2001 and entitled “Device for Prevention of Short Term Telecommunication Power Interruptions”.
20 Claims, 14 Drawings


Abstract

A device for preventing power interruptions to a DC bus includes a flywheel supported on bearings for rotation inside a chamber having a drag reducing atmosphere within a container. During charging, the flywheel is driven by an integral brushless permanent magnet excited motor/generator for storing energy, and during retrieval of the stored energy, the flywheel drives and is decelerated by the same motor generator. A closed loop operated synchronous inverter delivers synchronous electrical power to the armature coils of the motor/generator for accelerating the motor/generator. A rectifier connects the armature coils of the motor/generator to the DC bus. Upon an interruption of primary utility power, the motor/generator supplies unregulated voltage power to the DC bus through the rectifier, and the voltage of the unregulated voltage power to the DC bus falls as the flywheel slows during discharge of useable energy from the flywheel through the motor/generator to the DC bus. The amount of usable energy delivered to the DC bus during a utility power interruption is maximized by the combination of a low voltage drop in the armature coils and by the flywheel having sufficient inertia to reduce the rate of decay of the back emf of the motor/generator.

Independent Claims | See all claims (20)

  1. 1. A device for prevention of power interruptions to a DC bus, comprising: a flywheel supported for rotation about an axis of rotation on a bearing system in a drag reducing internal atmosphere inside a container; said flywheel having a large moment of inertia about said rotation of inertia; an integral brushless permanent magnet excited motor/generator having low resistance armature coils coupled to said flywheel for accelerating and decelerating said flywheel for storing and retrieving energy stored as rotational inertia of said flywheel; a closed loop operated synchronous inverter for supplying synchronous power to armature coils of said motor/generator for accelerating said flywheel; a rectifier connecting said armature coils of said motor/generator to said DC bus for supplying unregulated voltage power to said DC bus during an interruption of primary utility power; whereby the voltage of said DC bus falls as the speed of said flywheel slows during its discharge of useable energy to said DC bus, the amount of said usable energy delivered to said DC bus during a utility power interruption is maximized by a combination of a low voltage drop in said armature coils of said motor/generator and by sufficient inertia in said flywheel to reduce rates of decay of said motor/generator back emf.
  2. 18. 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.
  3. 19. 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.

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