WO2007040483A1 - Machines multipolaires - ameliorations - Google Patents

Machines multipolaires - ameliorations Download PDF

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Publication number
WO2007040483A1
WO2007040483A1 PCT/US2005/034066 US2005034066W WO2007040483A1 WO 2007040483 A1 WO2007040483 A1 WO 2007040483A1 US 2005034066 W US2005034066 W US 2005034066W WO 2007040483 A1 WO2007040483 A1 WO 2007040483A1
Authority
WO
WIPO (PCT)
Prior art keywords
magnetic field
field sources
rotor
flux density
zones
Prior art date
Application number
PCT/US2005/034066
Other languages
English (en)
Inventor
Doris Wilsdorf
Original Assignee
Doris Wilsdorf
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Doris Wilsdorf filed Critical Doris Wilsdorf
Priority to PCT/US2005/034066 priority Critical patent/WO2007040483A1/fr
Publication of WO2007040483A1 publication Critical patent/WO2007040483A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
    • H02K21/145—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures having an annular armature coil

Definitions

  • the aim in the first two cases is simplification and/or cost reduction in manufacturing, together with potential mechanical strengthening of rotors; the aim in the third case is reduction gradients of magnetic flux density in the zones in which the current flows and that translates into increased power density of machines and/or reduced "cogging".
  • the width of any one "zone” is not precisely defined.
  • the "zone width” is labeled L n , and is primarily identified with the circumferential width of the radially oriented permanent magnet poles in a Hallbach arrangement as projected on the rotor mid-line, and is secondarily identified with the width of the correlated electrical brushes that pick up the current in a zone.
  • the magnet arrangement may not be of Hallbach type, and/or the brush width may not equal the magnet pole width.
  • brush widths may advantageously be made narrower than the circumferential width of the correlated magnet pole pair as projected on the rotor mid-line, so as to raise the "effective" value of B, i.e. the average radial magnetic flux density to which the machine current is exposed while passing through the zones.
  • Rotors of MP machines of all types must be "current channeling" as well as be essentially free of eddy currents. To this end they require axially extended insulation barriers whose properties largely overlap but not coincide for the two purposes. Specifically, for the great majority of MP machines, as an upper limit, eddy current barriers need to be about
  • the upper right of Figure 1 shows the end of a rotor body composed of two layers, 2(1) and 2(2), that are mutually electrically insulated via insulation layer 4, as for an MP-Plus machine.
  • layers 2(1) and 2(2) are composed of bundles of, preferably twisted, wires (154) that are bonded together with electrically insulating layers 57.
  • the cross sectional shape of the wire bundles is optional.
  • the wires will be mutually insulated by means of thin layers that may soften on heating. After bundling and optional twisting by say, one to four revolutions per rotor length, the bundles may be compacted into the desired shape, e.g.
  • the insulation of the individual wires will be applied as a commercially available very thin enamel, and bonding layers 57 between wire bundles 154 will be made of several times thicker, but still less than one millimeter thick, commercially available glass insulation.
  • the enamel can sustain up to 900 V per single layer and the glass insulation up to 360V, thus permitting up to, say, 2,500 V potential difference between neighboring twisted wire bundles.
  • insulation layer 157 at rotor midline 4 between rotors 2(1) and 2(2) in conductive layer 155 may have to be made extra thick, as is suggested in Figure 1.
  • flags are mutually insulated conductors that connect any one rod, wire or wire bundle, with a corresponding rod, wire or wire bundle exactly one periodicity distance displaced, - and in fact in a neighboring rotor layer.
  • flags will be needed that conductively connect any one wire bundle 154 in rotor layer 2(1) to a wire bundle in rotor layer 2(2) that is displaced by (nearly exactly) one zone periodicity distance, i.e. from, say, zone N in layer 2(1) to zone (N+l) in layer 2(2).
  • (20) are mutually insulated foils or strips of metal that conduct current between an upper conductive layer (201), that on its outside will commonly also serve as a slip ring (34), to a lower layer 202, both of which are electrically sub-divided to propagate the pattern of the insulation layers 57 between the wire bundles, but displaced by one zone periodicity distance between top and bottom layer.
  • each flag 20 conducts currents between bundles of the two rotor layers, i.e. 2(1) and 2(2), but one periodicity distance displaced, as intended.
  • the morphology of the flags in Figure 1 may be regarded as a refinement of the "flags between tabs" construction of Figure 11 in the patent application "Multipolar-Plus Machines - Multipolar Machines with Reduced Numbers of Brushes," Patent Application PCT/US05/23245 filed 29 June 2005, or alternatively as a variant of "inserts in groove” as in Figure 9B of that application, wherein in Figure 1 the equivalent of the groove with inserts has been conductively butt-joined to the rotor body (i.e. the rotor part that rotates in the gap between magnet tubes 5 and 6, not shown in this figure) that is constructed from said twisted and compacted wire bundles
  • Insulating layer 203 is sized so as not to obstruct the current passage from wire bundles to layers 201 and 202, but to prevent short-circuiting between flags 20 and wire bundles 154. Thus insulating layer 203 plays the role of the insulated bottom of groove 41 in Figure 9B of the earlier application.
  • the actual flags in the flag module are mutually insulated pieces or strips of metal sheet, conductively joined to layers 201 and 202, and shaped to span the circumferential distance between neighboring zones, as in the earlier Figures 9, 10 and 11.
  • compacted twisted wire bundles may be assembled in the same manner as rods but, by being generally thicker and much stiffer, will be more easily handled, besides requiring fewer insulating joints between them.
  • flags per zone An important consideration in accordance with the present invention is the number of flags per zone. This is limited in two ways. Firstly by electric noise producing "cogging," as already indicated above and further discussed below in connection with Figure 2. This will require six or more flags per zone periodicity interval depending on magnet arrangement. A critical point herein is the fact that the electrical impedance among mutually insulated similar conductors, e.g. compacted wire-bundles, decreases with the average value of B across their width.
  • one (and typically the outer) surface of the flag module will serve as slip ring 34 and commonly its axial extent will be determined by the current carrying capability of the brushes.
  • one of two important means for decreasing the number of axially oriented current barriers without those twin problems is the use of twisted wire bundles instead of rods, for providing the needed eddy current barriers as in Figure 1 already discussed.
  • the second is a novel magnet arrangement that provides a much flatter maximum of B(x), with x-the local circumferential coordinate, than do Hallbach arrangements.
  • Figure 2 clarifies the effects of insulating barrier spacing for two different types of magnet arrangements, namely (i) a Hallbach array ( Figure 2A and C) and (n) in Figure 2B, a novel magnet arrangement for which no detailed modeling is as yet available. Also considered are two different spacings between the current-channeling insulation layers in the rotor, i.e. bundle widths in terms of Figure 1.
  • the extreme positions of the left-most insulating bonding layers 57 e.g. the momentarily edges of the left-most current-conducting bundle, are indicated by vertical arrows.
  • x u shows the leading bundle boundary position as it just begins to protrude beyond the trailing edge of the brush
  • X L shows the position of the trailing insulation layer (57) as the bundle just loses contact with the brush.
  • any combination of 2L m /L ⁇ 3>1.25 and Hm/Lo >0.1 maybe suitable for the purpose of achieving acceptable B(x) in terms of Figure 2B.
  • 2L n ZLo and H m /Lo machine voltage will decrease and cost will rise, respectively. Practically speaking, this may provide the limits of 2L n ZLo ⁇ 20 and H m /Lo ⁇ 5.
  • 0.1LQ ⁇ H m ⁇ 5L G and 1.25LQ ⁇ 2Lm ⁇ 20LQ are preferred dimensions for magnetic field sources in the form of permanent magnets and gap widths between opposing poles in machines of the MP family.
  • superior MP machine performance may be achieved by the use of magnets of alternating, predominantly radial sense of magnetization, with few if any, say, less than 10% of circumferential space occupancy, of magnets with tangential orientation of magnetization, and the indicated range of dimensions.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

L'invention concerne un rotor pour une machine multipolaire étant fait de couches de câbles (2(1) et 2(2)). Les câbles sont des faisceaux de câbles torsadés compactés (154) afin de réduire la denture et les gradients de la densité de flux magnétique.
PCT/US2005/034066 2005-09-23 2005-09-23 Machines multipolaires - ameliorations WO2007040483A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/US2005/034066 WO2007040483A1 (fr) 2005-09-23 2005-09-23 Machines multipolaires - ameliorations

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2005/034066 WO2007040483A1 (fr) 2005-09-23 2005-09-23 Machines multipolaires - ameliorations

Publications (1)

Publication Number Publication Date
WO2007040483A1 true WO2007040483A1 (fr) 2007-04-12

Family

ID=37906429

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2005/034066 WO2007040483A1 (fr) 2005-09-23 2005-09-23 Machines multipolaires - ameliorations

Country Status (1)

Country Link
WO (1) WO2007040483A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3891876A (en) * 1973-12-21 1975-06-24 Singer Co Permanent magnet electric motor having a non-ferrous solid armature
US5723933A (en) * 1994-04-26 1998-03-03 Orto Holding A.G. Electronically commutated DC machine
US20040017125A1 (en) * 2002-07-25 2004-01-29 Honda Giken Kogyo Kabushiki Kaisha Armature coil for slotless rotary electric machinery

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3891876A (en) * 1973-12-21 1975-06-24 Singer Co Permanent magnet electric motor having a non-ferrous solid armature
US5723933A (en) * 1994-04-26 1998-03-03 Orto Holding A.G. Electronically commutated DC machine
US20040017125A1 (en) * 2002-07-25 2004-01-29 Honda Giken Kogyo Kabushiki Kaisha Armature coil for slotless rotary electric machinery

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