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Energy storage apparatus

  • US 4,077,678 A
  • Filed: 07/30/1976
  • Issued: 03/07/1978
  • Est. Priority Date: 07/30/1976
  • Status: Expired due to Term
First Claim
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1. An energy storage apparatus comprising:

  • a stator;

    a flywheel rotor including a spokeless, continuous ring portion, and a plurality of salient pole members distributed along an inner rim of said ring portion, a first air gap being formed between opposed pairs of said pole members;

    said flywheel rotor being rotatable around an outer rim of said stator, a second air gap being formed between said stator and said rotor;

    stationary armature means extending into said first air gap;

    means for supplying alternating current to said armature means in a motor mode of operation, said alternating current interacting with magnetic flux in said first air gap to cause rotation of said rotor;

    means for withdrawing alternating current from said armature means in a generator mode of operation; and

    magnetic bearing means for magnetically supporting said rotor in axial and radial alignment to said stator, including;

    first permanent magnet means incorporated in said stator for establishing a steady state flux in said second air gap, andsets of opposed salient teeth within said rotor and said stator, respectively, said steady state flux passing through said second air gap between said opposed salient teeth for maintaining said rotor and said stator in axial alignment to one another.

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