Drive system with electromagnetic energy transfer

{
  "publication_number": "US10454356B2",
  "country": "US",
  "kind": "B2",
  "title": "Drive system with electromagnetic energy transfer",
  "abstract": "The invention relates to a drive system (1) with electromagnetic energy transfer. The system (1) comprises a track (3) comprising a plurality of stators (4), each stator (4) having at least one winding adapted to generate a magnetic field having a fundamental harmonic (8) and at least one further harmonic (9) when fed with an varying current, and a movable element (2) comprising a primary magnetic element (5) adapted to receive said fundamental harmonic (8) to drive said movable element (2) along said track. The system (1) is characterized in that said movable element (2) further comprises a secondary magnetic element (6 a - 6 c) adapted to receive said at least one further harmonic (9) to generate power onboard of said movable element (2). The invention also relates to a linear fractional slot synchronous machine and a rotational synchronous machine.",
  "claims": [
    "1. A drive system for electromagnetic energy transfer, comprising: a track defining a predetermined path, the track including a plurality of stators, each stator having at least one electrical winding configured to generate a magnetic field having a fundamental harmonic signal and at least one sub-harmonic signal when supplied with a varying current; a movable magnetic device configured to move along the predetermined path in response to the generated magnetic field, the moveable magnetic device including: a primary magnetic component configured to receive the fundamental harmonic signal and configured to drive the movable magnetic device along the predetermined path, and a secondary magnetic component configured to receive the at least one sub-harmonic signal and configured to generate power for the movable magnetic device based on the received sub-harmonic signal; and a control unit configured to modulate the varying current to affect the at least one sub-harmonic signal and increase the power generated for the movable magnetic device.",
    "2. The drive system according to claim 1, wherein the varying current is an alternating current.",
    "3. The drive system according to claim 1, wherein at least one of the primary magnetic component and the secondary magnetic component includes a winding.",
    "4. The drive system according to claim 1, wherein the movable magnetic device further comprises a plurality of primary magnetic components and secondary magnetic components alternately arranged along the movable magnetic device.",
    "5. The drive system according to claim 4, wherein the secondary magnetic components each include a winding that defines a width that substantially scales to a distance between subsequent primary magnetic components, the width being based on a frequency ratio between the fundamental harmonic signal and the at least one sub-harmonic signal.",
    "6. The drive system according to claim 1, wherein the movable magnetic device further comprises a mounting plate on which the primary magnetic component and the secondary magnetic component are mounted, the mounting plate comprising a slot for receiving the secondary magnetic component.",
    "7. The drive system according to claim 6, wherein the mounting plate is made of a material having a high magnetic permeability.",
    "8. The drive system according to claim 7, wherein the material is iron.",
    "9. The drive system according to claim 1, wherein the stators are configured to successively receive successive phases of the varying current.",
    "10. A linear fractional slot synchronous machine, comprising: the drive system according to claim 1.",
    "11. A rotational synchronous machine, comprising: the drive system according to claim 1.",
    "12. A movable magnetic device configured to move along a track in response to a generated magnetic field, the track defining a predetermined path and including a plurality of stators, each stator having at least one electrical winding configured to generate a magnetic field having a fundamental harmonic signal and at least one sub-harmonic signal when supplied with a varying current, the movable magnetic device comprising: a primary magnetic component configured to receive the fundamental harmonic signal and configured to drive the movable magnetic device along the predetermined path of the track; and a secondary magnetic component configured to receive the at least one sub-harmonic signal and configured to generate power for the movable magnetic device; wherein when the at least one sub-harmonic signal is increased, by a control unit configured to modulate the varying current, additional power is generated for the magnetic movable device.",
    "13. The movable magnetic device according to claim 12, wherein at least one of the primary magnetic component and the secondary magnetic component includes a winding.",
    "14. The movable magnetic device according to claim 12, wherein the movable magnetic device further comprises a plurality of primary magnetic components and secondary magnetic components alternately arranged along the movable magnetic device.",
    "15. The movable magnetic device according to claim 14, wherein the secondary magnetic components each include a winding that defines a width that substantially scales to a distance between subsequent primary magnetic components, the width being based on a frequency ratio between the fundamental harmonic signal and the at least one sub-harmonic signal.",
    "16. The movable magnetic device according to claim 12, further comprising: a mounting plate on which the primary magnetic component and the secondary magnetic component are mounted, the mounting plate comprising a slot for receiving the secondary magnetic component.",
    "17. The movable magnetic device according to claim 16, wherein the mounting plate is made of a material having a high magnetic permeability.",
    "18. The movable magnetic device according to claim 17, wherein the material is iron."
  ],
  "description_excerpt": "The invention relates to a drive system with electromagnetic energy transfer. The invention also relates to a linear fractional slot synchronous machine and a rotational synchronous machine. The aim is to do energy harvesting on board a movable element of a servo brushless motor in order to generate electrical power on the moving element for different usages, depending on application.\n\nIn the food packaging industry packages are manufactured and filled with food in large machines transforming packaging material into packages which are filled with food content, either during the formation of the package or after the package has been created. In these packaging machines, packages and equipment for handling the packages or the packaging material need to be conveyed.\n\nWO 2015/101492 discloses a solution for the problem of molding plastic objects onto cardboard-based packaging material intended to form packages while the packaging material is conveyed. Multiple molding stations are pulled by a linear synchronous motor along an annular track such that the molding stations are aligned over a moving sheet of packaging material. For a period of time a moving molding station is aligned to an area of the packaging material so as to mould an object on said area. This solution has the advantage that work can be made on the packaging material without stopping the feeding of the packaging material in a packaging machine. In addition, precise alignment of each molding station with the corresponding area of the packaging material can be achieved.",
  "cpc": [
    "H02K 41/033",
    "B29C 33/34",
    "B29C 66/8244",
    "B29C 66/849",
    "B29L 2031/712",
    "B60L 13/03",
    "H02K 19/12",
    "H02K 19/28",
    "H02K 41/03",
    "H02K 41/031"
  ],
  "ipc": [
    "H02K 41/03",
    "B60L 13/03"
  ],
  "assignees": [
    "Tetra Laval Holdings and Finance SA"
  ],
  "inventors": [
    "Davide Borghi",
    "Stefano Flore",
    "Claudio Bianchini",
    "Matteo DAVOLI"
  ],
  "filing_date": "2016-09-19",
  "publication_date": "2019-10-22",
  "grant_date": "2019-10-22",
  "priority_date": "2015-10-01",
  "application_number": "US-201615755568-A",
  "family_id": "54251436",
  "cited_by_count": 4,
  "citations": [
    "US5249191A",
    "WO1993002888A1",
    "US5412502A",
    "US5619369A",
    "WO2006048441A1",
    "RU2454774C1",
    "US20110031840A1",
    "US20140232209A1",
    "WO2015101492A1"
  ]
}