Reciprocating electrical machine

{
  "publication_number": "US2009058201A1",
  "country": "US",
  "kind": "A1",
  "title": "Reciprocating electrical machine",
  "abstract": "Method for transforming energy in a reciprocating electric machine, particularly a motor or generator. An electrically operated linear movable piston oscillates between two springs. The energy in the springs is at least five times larger than the energy transferred between the piston and the electrical system for each cycle of the machine. A reciprocating electric machine comprises a linear movable piston 15, which is arranged in a tubular cylinder 11 to operate as a working element. It is provided with magnetic elements, which establish an outwardly directed electrical field of force, which is effective towards a surrounding row of tubular, coils 22. At each end of the cylinder 11 is formed a spring which forms a resonance-effective arrangement. The interaction between the magnetic fields of the coils 22 and the magnetic elements 16, respectively, obtain energy transmission between the coils and the piston 15.",
  "claims": [
    "1. Method for transforming energy in a reciprocating electric machine, particularly a motor or generator, comprising an electrically operated linear movable piston which oscillates between a system of two springs, characterized in that the energy in the spring system is at least five times larger than the energy transferred between the piston and the electrical system for each cycle of the machine, the energy of the spring system being the sum of the difference between the spring forces and the kinetic energy of the piston.",
    "2. Method according to claim 1, characterized in that the piston (15) is operating in a tubular cylinder (11) as a working element in a motor or a generator and being provided with magnetic elements which establish an outwardly directed electrical field of force, which is acting towards a surrounding row of tubular coils (22), where at each end of the cylinder (11), and where the interaction between the magnetic fields of the coils (22) and the magnetic elements (16) respectively provide energy transmission between the electrical energy in the coils and the mechanical energy of the axial movement of the piston (15) in the cylinder (11).",
    "3. Method according to claim 1, characterized in that the machine is operated at a oscillation frequency of 8-500 Hz.",
    "4. Reciprocating electric machine, particularly for a motor or generator, comprising a linear movable piston (15) which is arranged in a tubular cylinder (11) to operate as a working element in a motor or a generator and which is provided with magnetic elements which establish an outwardly directed electrical field of force, which is effective towards a surrounding row of tubular coils (22), where at each end of the cylinder (11) is formed a spring which forms a resonance-effective arrangement, and where the interaction between the magnetic fields of the coils (22) and the magnetic elements (16) respectively obtain energy transmission between the electrical energy in the coils and the mechanical energy of the axial movement of the piston (15) in the cylinder (11), characterized in that the energy in the spring system is at least five times larger than the energy transferred between the piston (15) and the electrical system for each cycle of the machine.",
    "5. Reciprocating electric machine according to claim 4, characterized in that the spring at each end of the cylinder is a gas spring.",
    "6. Reciprocating electric machine according to claim 4, characterized in that a screw spring or magnetic spring is arranged at each end of the cylinder as a supplement to the gas springs for holding the piston in position when the machine is turned off.",
    "7. Reciprocating electric machine according to claim 4, for use as a vibrator or compacter, characterized in that the free ends of the cylinder (11) has end elements (12, 13) for force transfer, one of which is for transfer of force between the electrical machine and an operational member and the second (13) between the vibrator and a spring device (38).",
    "8. Reciprocating electric machine according to claim 4, characterized in that a central connection rod (18) is arranged to hold together the elements (16, 17, 20) of the piston (15).",
    "9. Reciprocating electric machine according to claim 4, characterized in that the end elements (12, 13) for force transfer are connected by an outer tubular housing (29).",
    "10. Reciprocating electric machine according to claim 9, characterized in that the ends of the tubular housing (29) is lined with a non-conducting material (26) which has an inner low friction sleeve (27) defining the wall (14) of the cylinder for the piston (15).",
    "11. Reciprocating electric machine according to claim 10, characterized in that the coils (22) arranged on the low friction sleeve (27) have back iron outside them to prevent circular currents in the tubular housing (29)."
  ],
  "cpc": [
    "H02K 33/16"
  ],
  "assignees": [
    "RESONATOR AS"
  ],
  "filing_date": "2007-02-28",
  "publication_date": "2009-03-05",
  "priority_date": "2006-03-09",
  "application_number": "US-28164607-A",
  "family_id": "38475119",
  "citations": [
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  ]
}