WO2002001701A1 - Moteur electrique - Google Patents

Moteur electrique Download PDF

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Publication number
WO2002001701A1
WO2002001701A1 PCT/GB2001/002856 GB0102856W WO0201701A1 WO 2002001701 A1 WO2002001701 A1 WO 2002001701A1 GB 0102856 W GB0102856 W GB 0102856W WO 0201701 A1 WO0201701 A1 WO 0201701A1
Authority
WO
WIPO (PCT)
Prior art keywords
electromagnets
electrically conductive
electrical motor
arms
motor according
Prior art date
Application number
PCT/GB2001/002856
Other languages
English (en)
Inventor
Alan Glyn Jones
Original Assignee
Alan Glyn Jones
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
Priority claimed from GB0015540A external-priority patent/GB0015540D0/en
Application filed by Alan Glyn Jones filed Critical Alan Glyn Jones
Priority to AU2001266187A priority Critical patent/AU2001266187A1/en
Publication of WO2002001701A1 publication Critical patent/WO2002001701A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K17/00—Asynchronous induction motors; Asynchronous induction generators
    • H02K17/02—Asynchronous induction motors
    • H02K17/16—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors

Definitions

  • This invention relates to an electrical motor and, in particular, to an electrical motor which can be operated using either a direct current (dc) or an alternating current (ac) power supply for use in a wide range of applications, including automotive, industrial, nautical, aeronautical, and domestic.
  • dc direct current
  • ac alternating current
  • Such a known arrangement generally requires the provision of several coils, each of which is energised in parallel by a current such that a relatively high current input is required to obtain a high efficiency in operating speed.
  • such conventional motors have a low 'turning power' -to-current size ratio and are therefore relatively inefficient in moving large weights. I have now devised an improved electrical motor which seeks to overcome at least some of the problems associated with conventional motors. Thus, in .
  • an electrical motor comprising a generally circular, substantially flat electrically conductive element and a plurality of electromagnets located in spaced apart relation around an edge of said electrically conductive member, said electromagnets each comprising at least one coil of electrically conductive material, each of said coils being connected together in series.
  • the electromagnets will in most cases require a core of magnetically conductive material around at least a portion ⁇ of which the at least one coil is wound.
  • an electrical motor comprising a generally circular, substantially flat electrically conductive element and a plurality of electromagnets located in spaced apart relation around an edge of said electrically conductive member, at least some of the electromagnets comprising two coils of electrically conductive material, said edge of said electrically conductive member being positioned between said coils.
  • the electromagnets comprise a core comprising two arms of magnetically conductive material connected together at one end by a connecting member, a coil of conductive material being wound on each of said two arms, and the electrically conductive member being positioned between the arms of the cores.
  • the electromagnets of the electrical motor according to both aspects of the present invention may be energised by means of a dc, preferably square-wave, current/voltage supply, or an ac current/voltage supply.
  • the coils wound on the arms of the electromagnets are preferably connected together in series such that a relatively low current (and high voltage) is required to energise the electromagnet arrangement.
  • the electromagnets of the first aspect of the present invention are preferably generally U-shaped as defined in accordance with the second aspect of the present invention.
  • the electrically conductive member may be generally disc-shaped, in which case the electromagnets are located in spaced apart relation around the outer periphery of the disc-shaped member.
  • the electrically conductive member may alternatively be generally annular, in which case the electromagnets can either be located around the outer periphery of the annular member, or they can be placed within the annular member around the edge of the member which defines the generally central opening.
  • the conductive member is preferably laminated, beneficially of steel and copper, and the laminations are preferably at an angle or tangent to the surface of the conductive member in order to maximise the "start up" torque.
  • the electromagnets may comprise two, generally straight substantially parallel arms of magnetically conductive material connected together at one end thereof by an insulative connecting member which is substantially perpendicular to said arms.
  • the at least the distal (or free) ends of the arms are beneficially curved towards each other, thereby maximising the magnetic field adjacent to the conductive member and allowing it to be suspended between the arms of the electromagnets and eliminating the need for bearings to prevent friction, although bearings may be provided to prevent contact between the conductive member and the electromagnets, when the motor comes to rest.
  • the electromagnets are arranged to produce an additional or increased electromagnetic field between the proximal (i.e. connected) ends of the electromagnets which acts on the edge of the conductive member in use.
  • the connecting member between the proximal ends of the arms may be relatively thin (so that the portions of the arms close to the proximal ends are relatively close together, with the arms extending outwardly at an angle from the connecting member to form a general V or C-shape.
  • the distal ends are beneficially curved inwards towards each other.
  • the additional core member provided on the connecting member may carry a 'reverse direction' conductive coil capable of conducting an induced electrical current which can be used to regulate the speed of rotation of the motor and/or to recharge a battery used to provide the current to energise the electromagnets.
  • the conductive member may comprise or be attached to the hub of a wheel of a vehicle, such that the electrical motor can be used to drive a vehicle.
  • the conductive member may be rigidly connected to the end of a shaft of, for example a boat or aeroplane propellor.
  • the electrical motor of the invention relies on a high voltage rather than a high current (because the coils of the electromagnets are connected in series) , thus enabling a smaller battery to be used than for conventional motors. This increases the 'turning power' -to-size ratio, enabling it to be used for propulsion of wheeled vehicles, boats or aeroplanes, for example.
  • the electrical motor of the present invention is considered to offer a high efficiency-to-battery size alternative to conventional electrical motors.
  • Figure 1 is a schematic view of an electrical motor according to a first embodiment of the present invention
  • Figure 2 is a side view of the electrical motor of Figure 1;
  • Figure 3 is a side view of an electrical motor according to a second embodiment of the present invention.
  • Figure 4 is a side view of an electrical motor according to a third embodiment of the present invention.
  • Figure 5 is a perspective view of an electrical motor according to an exemplary embodiment of the present invention, when in use;
  • Figure 6 is a schematic view of an electrical motor according to a fourth embodiment of the present invention.
  • Figure 7 is a side view of the electrical motor of Figure
  • Figure 8 is a side view of an electrical motor according to a fifth embodiment of the present invention.
  • Figure 9 is a side view of an electrical motor according to a sixth embodiment of the present invention.
  • Figure 10 is a perspective view of an electrical motor according to another exemplary embodiment of the present invention.
  • an electrical motor according to a first embodiment of the present invention comprises a generally disc-shaped member 10 of electrically conductive material.
  • the disc-shaped member 10 is of laminated steel and copper, with the laminations at an angle or tangent to the surface of the disc-shaped member 10 in order to maximise the "start up" torque.
  • Electromagnets 12 are located around the peripheral edge of the disc-shaped member 10, each being a substantially equal distance apart. In the embodiment shown, four electromagnets 12 are provided. However, in a typical embodiment, at least eight electromagnets are preferred.
  • the electromagnets each comprise two substantially straight, substantially parallel arms 14 of magnetically conductive material such as soft iron or mild steel. The arms 14 are connected together at one end by an insulative connecting member 16, perpendicular to the arms 14, to form a generally U-shaped element, the edge of the disc-shaped member 10 being located between the two arms 14.
  • Around each of the arms 14 is wound a coil 18 of electrically conductive wire, such as copper or aluminium wire and the coils 18 are all joined together in series.
  • the coils 18 When the coils 18 are energised by a pulsed direct current or alternating current flowing through each of the coils in series, a magnetic field is produced between the two arms 14 which acts on the disc-shaped member 10 enabling it to be- suspended between the arms of the electromagnets 12, and causes an emf (and therefore a current) to be set up in the disc-shaped member 10, causing a distortion of the magnetic flux and resulting in 'free' rotational movement of the disc-shaped member 10, the direction of rotation being dependent upon the direction of flow of the current through the coils.
  • the coils 18 may be energised by means of a square-wave dc current or an ac current, controlled by a microprocessor.
  • the variables which affect both operating efficiency and application are: frequency of the (square-wave) direct current, the magnitude of the voltage across the electromagnets, the dimensions of the electrically conductive member, the materials used in the electrically conductive member, the phasing or pulsing of the (square- wave) direct current, and the proximity of the electromagnets to each other.
  • the distal ends of arms 14 of the electromagnets 12 may curve inwardly towards each other, to increase the strength of the magnetic field adjacent the disc-shaped member 10.
  • the connecting member 16 may be provided with an additional 'reverse direction' coil 20 in which a current may be induced due to the movement of the electrically conductive member through a magnetic field. This induced current may be used to recharge the battery supplying the electrical motor or for controlling (i.e. increasing or decreasing) the speed of rotation of the electrically conductive member 10, for example.
  • one exemplary embodiment of the electrical motor of the invention comprises a ring-shaped, insulative spacer or connecting member 16 surrounding a generally disc-shaped electrically conductive member 10.
  • the arms 14 of the electromagnets 12 are connected to the spacer 16 approximately 45 degrees apart, so that the disc-shaped member 10 is positioned between the coils 18.
  • the disc-shaped member is provided with a central recess 22 which receives and retains the end of a shaft 24 of, for example, a propellor so that rotation of the electrically conductive member results in corresponding rotation of the shaft 24.
  • the electrically conductive member 10 is generally annular having a relatively large, substantially central opening
  • the electromagnets 12, in this case, are positioned at substantially 45 degrees apart around the inner edge of the annular member 10 which defines the central opening 26, as shown .
  • Figure 8 shows a similar arrangement to that of Figure 7, except that the distal ends of the electromagnets 12 are curved inwardly towards each other, as described with reference to Figure 3.
  • Figure 9 of the drawings shows a similar arrangement to that of Figure 8, except that an additional 'reverse direction' coil 20 is provided on the connecting member 16 between the proximal ends of the arms 14 of the electromagnets 12, as described with reference to Figure 4 of the drawings.
  • an exemplary embodiment of 'an electrical motor comprises a ring-shaped, insulative spacer or connecting member 16 located within the central opening 26 of ' the annular electrically conductive member 10.
  • the arms 14 of the electromagnets 12 are connected to the spacer 16 approximately 45 degrees apart such that the annular member 10 is positioned between the arms 14, as shown .

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

La présente invention concerne un moteur électrique comprenant, d'une part un élément électro-conducteur (10) sensiblement plat et de forme générale circulaire, et d'autre part une pluralité d'électroaimants (12) situés de place en place autour d'un bord de l'élément électro-conducteur (10). Les électroaimants comprennent un noyau de forme générale en U constitués de deux branches (14) de matériau magnétiquement conducteur autour desquels sont enroulés des bobinages (18) de matériau électro-conducteur. Les branches (14) des U des électroaimants (14) sont reliées en une extrémité par un élément de liaison isolant ou écarteur (16). Les bobinages des électroaimants sont tous montés en série, les électroaimants étant alimentés en électricité en courant continu pulsé ou en phase, ou par un courant alternatif. Pour le fonctionnement, lorsque les électroaimants (12) sont alimentés, l'élément électro-conducteur (10) est suspendu entre les branches (14) des électroaimants (12). Il en résulte l'induction d'une force électromotrice et donc d'un courant dans l'élément électro-conducteur (10) créant une distorsion du champ magnétique produit par les électroaimants (12)et provoque la mise en rotation de l'élément électro-conducteur (10).
PCT/GB2001/002856 2000-06-27 2001-06-27 Moteur electrique WO2002001701A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001266187A AU2001266187A1 (en) 2000-06-27 2001-06-27 Electrical motor

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB0015540.8 2000-06-27
GB0015540A GB0015540D0 (en) 2000-06-27 2000-06-27 Circular linear motor
GB0029819.0 2000-12-07
GB0029819A GB2364181A (en) 2000-06-27 2000-12-07 Electrical motor

Publications (1)

Publication Number Publication Date
WO2002001701A1 true WO2002001701A1 (fr) 2002-01-03

Family

ID=26244543

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2001/002856 WO2002001701A1 (fr) 2000-06-27 2001-06-27 Moteur electrique

Country Status (2)

Country Link
AU (1) AU2001266187A1 (fr)
WO (1) WO2002001701A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3840764A (en) * 1972-08-25 1974-10-08 M Burger Drive arrangement for a washing or dry cleaning machine
US4095150A (en) * 1976-07-12 1978-06-13 Karlheinz Senckel Two-phase asynchronous motor
EP0386608A1 (fr) * 1989-03-06 1990-09-12 Siemens Aktiengesellschaft Appareil pour modulation des rayons dans le trajet du faisceau d'analyseurs photométriques
US5955800A (en) * 1995-04-06 1999-09-21 University Of Sheffield Levitation systems

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3840764A (en) * 1972-08-25 1974-10-08 M Burger Drive arrangement for a washing or dry cleaning machine
US4095150A (en) * 1976-07-12 1978-06-13 Karlheinz Senckel Two-phase asynchronous motor
EP0386608A1 (fr) * 1989-03-06 1990-09-12 Siemens Aktiengesellschaft Appareil pour modulation des rayons dans le trajet du faisceau d'analyseurs photométriques
US5955800A (en) * 1995-04-06 1999-09-21 University Of Sheffield Levitation systems

Also Published As

Publication number Publication date
AU2001266187A1 (en) 2002-01-08

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