WO2001050578A1 - Moteur a reluctance a commutation mecanique - Google Patents

Moteur a reluctance a commutation mecanique Download PDF

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Publication number
WO2001050578A1
WO2001050578A1 PCT/US2000/034327 US0034327W WO0150578A1 WO 2001050578 A1 WO2001050578 A1 WO 2001050578A1 US 0034327 W US0034327 W US 0034327W WO 0150578 A1 WO0150578 A1 WO 0150578A1
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WO
WIPO (PCT)
Prior art keywords
phase
rotor
windings
brushes
pick
Prior art date
Application number
PCT/US2000/034327
Other languages
English (en)
Inventor
Wayne A. Pengov
Original Assignee
Tridelta Industries, Inc.
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 Tridelta Industries, Inc. filed Critical Tridelta Industries, Inc.
Priority to AU24365/01A priority Critical patent/AU2436501A/en
Publication of WO2001050578A1 publication Critical patent/WO2001050578A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R39/00—Rotary current collectors, distributors or interrupters
    • H01R39/02—Details for dynamo electric machines
    • H01R39/08—Slip-rings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K19/00—Synchronous motors or generators
    • H02K19/02—Synchronous motors
    • H02K19/10—Synchronous motors for multi-phase current
    • H02K19/103—Motors having windings on the stator and a variable reluctance soft-iron rotor without windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K25/00—DC interrupter motors or generators

Definitions

  • the present invention relates generally to switched reluctance motors, and more particularly to a mechanically commutated switched reluctance motor.
  • U.S. Patent No. 5,852,334 to Pengov discloses a two-phase switched reluctance motor.
  • One embodiment of the motor shows a rotor having two wide rotor poles and two narrow rotor poles.
  • the rotor is sequentially advanced in a two-step fashion, wherein during a first step, the leading edges of the wide rotor poles interact with a first pair of energized stator poles.
  • the narrow rotor poles are drawn into alignment with a second pair of energized stator poles.
  • An electronic controller is used to control the firing of the respective phases of the motor and for adjusting the rotational speed of the rotor.
  • the electronic controller constitutes a major portion of the cost of a motor of the type disclosed in U.S. Patent No. 5,852,334.
  • the ability to electronically control the timing of phase energization may not be required, and a fixed speed motor, or a motor wherein the speed may be adjusted by controlling the applied voltage, may be sufficient.
  • the present invention provides a mechanically commutated switched reluctance motor that eliminates the need for an electronic controller.
  • a switched reluctance motor comprised of a stator having a plurality of spaced apart, radially oriented, like stator poles that define a gap between adjacent stator poles. Windings for two phases are wound about the stator poles such that windings and stator poles of one phase are circumferentially separated by a winding and an associated stator pole of the other phase. Each phase has a positive and negative terminal for energizing the respective windings of such phase.
  • a rotor element is mounted for rotation relative to the stator. The rotor element has a wide rotor pole having a wide rotor pole face and a narrow rotor pole having a narrow rotor pole face.
  • the rotor poles are dimensioned such that energization of one of the phases causes a predetermined angular rotation of the rotor wherein a first portion of the angular rotation is created by a wide rotor pole being drawn into a minimum reluctance position relative to one of said energized stator poles and the other portion of the angular rotation is created by a narrow rotor pole being drawn into a minimum reluctance position with another of the energized stator poles, the wide rotor pole being in a minimum reluctance position when the narrow rotor pole is in a minimum reluctance position.
  • Conductive elements are rotatable with the rotor. The elements are electrically connected to the positive and negative terminals of the phase windings. Power leads engage the conductive elements to alternately energize the first phase and second phase as the rotor rotates.
  • a switched reluctance motor comprised of a stator having a plurality of spaced apart, radially oriented, like stator poles that define a gap between adjacent stator poles. Windings for a first phase and a second phase are wound about stator poles that are circumferentially separated by a winding and an associated stator pole of a different phase.
  • a rotor element is mounted for rotation relative to the stator. The rotor element has a wide rotor pole having a wide rotor pole face and a narrow rotor pole having a narrow rotor pole face.
  • the rotor poles are dimensioned such that energization of one of the phases causes a predetermined angular rotation of the rotor wherein a first portion of the angular rotation is created by the wide rotor pole being drawn into a minimum reluctance position relative to one of the energized stator poles and the other portion of the angular rotation is created by the narrow rotor pole being drawn into a minimum reluctance position with another of the energized stator poles, the wide rotor pole being in a minimum reluctance position when the narrow rotor pole is in a minimum reluctance position.
  • a pair of power brushes is connectable to the leads of a power source.
  • a pair of first phase pick-up brushes is connected to the windings of the first phase in a manner to energize the same.
  • a pair of second phase pick-up brushes is connected to the windings of the second phase in a manner to energize the same.
  • First phase and second phase connector plates are mounted to the rotor for rotation therewith. The connector plates are dimensioned and disposed relative to the power brushes and the pick-up brushes to mechanically commutate the first and second phase windings.
  • a switched reluctance motor comprised of a stator having a plurality of spaced apart, radially oriented, like stator poles. Windings for a first phase and a second phase are wound about stator poles that are circumferentially separated by a winding and an associated stator pole of a different phase.
  • a rotor is mounted for rotation relative to the stator. The rotor has a plurality of spaced apart rotor poles. The rotor poles are dimensioned such that energization of one of the phases causes a predetermined angular rotation of the rotor.
  • a pair of power brushes is connectable to the leads of a power source.
  • a pair of first phase pick-up brushes is connected to the windings of the first phase in a manner to energize the same.
  • a pair of second phase pick-up brushes is connected to the windings of the second phase in a manner to energize the same.
  • First phase and second phase connector plates are mounted to the rotor for rotation therewith. The connector plates are dimensioned and disposed relative to the power brushes and the pick-up brushes to mechanically commutate the first and second phase windings.
  • a switched reluctance motor comprised of a stator having a plurality of spaced apart, radially oriented, like stator poles. Windings for an "N" number of phases are wound about said stator poles.
  • a rotor is mounted for rotation relative to the stator. The rotor has a plurality of rotor poles. The rotor poles are dimensioned such that energization of each of the N number of phases causes a predetermined angular rotation of the rotor.
  • a pair of stationary power brushes is connectable to leads of a power source.
  • a pair of stationary phase pick-up brushes is provided for each phase of the N number of phases.
  • the pick-up brushes are connected to the respective windings of the phase in a manner to energize the same.
  • a pair of connector plates is provided for the each phase.
  • the connector plates are mounted to the rotor for rotation therewith.
  • the pair of connector plates are disposed relative to the power brushes and the pick-up brush so as to electrically connect the power brushes with the pick-up brush to produce a current path through the winding of the each phase when in the rotor is at specific angular positions.
  • FIG. 1 is a pictorial view of a mechanically commutated switched reluctance motor, illustrating a preferred embodiment of the present invention
  • FIG. 2 is a partially sectioned end view of the motor shown in FIG. 1 taken along lines 2-2 of FIG. 4;
  • FIG. 3 is an enlarged, partially sectioned end view of the motor shown in FIG. 1 taken along lines 3-3 of FIG. 4, showing a power brush in cross-section;
  • FIG. 4 is an enlarged side view of a rotor shaft and mechanical commutation assembly
  • FIG. 5 is a schematic illustration of a circuit for mechanically commutating a two-phase motor in accordance with the present invention, showing phase B energization;
  • FIG. 6 is a schematic illustration of a circuit for mechanically commutating a two-phase motor in accordance with the present invention, showing phase A energization
  • FIG. 7 is a schematic illustration of a circuit for mechanically commutating a two-phase motor in accordance with the present invention, showing simultaneous energization of phase A and phase B;
  • FIG. 8 is a schematic illustration of a circuit for mechanically commutating a two-phase motor in accordance with the present invention, showing energization of phase B with the beneficial induced current through phase A applied to phase B;
  • FIG. 9 is a graph illustrating the phase energization sequence for the mechanical commutation assembly shown in FIGS. 1-7;
  • FIG. 10 is a graph showing torque versus rotor position for the mechanically commutated motor shown in FIGS. 1-7;
  • FIG. 11 is an enlarged view of a power brush and commutation assembly, illustrating an alternate embodiment of the present invention.
  • FIG. 12 is a graph illustrating the phase energization sequence for the mechanical commutation assembly shown in FIG. 1 1;
  • FIG 13 is a graph showing torque versus rotor position for a motor mechanically commutated by the assembly shown in FIG 1 1, and
  • FIG 14 is a partially sectioned end view of a sw itched reluctance motor, illustrating another embodiment of the present invention Detailed Description of Preferred Embodiment
  • FIG 1 shows a perspective view of a mechanically commutated, two- phase switched reluctance motor 10, illustrating a prefe ⁇ ed embodiment of the invention
  • Motor 10 is an 8/4 motor of a type disclosed in U S Patent No 5,852,334 to Pengo ⁇ , the disclosuie of which is expressly incorporated herein by reference
  • motoi 10 has a statoi with eight stator poles and a rotoi w ith four rotor poles
  • the rotor includes two wide rotor poles and tw o na ⁇ ow iotor poles
  • the wide lotor poles are diametncally opposed to each other (as are the narrow rotor poles) and extend along the entire axial length of the lotoi As described in greater detail in U S Patent No 5,852,334, during
  • motor 10 is comp ⁇ sed of a stator 20 and a rotor 40 Stator 20 is comprised of a stack of plate laminations 22 (best seen in FIG 4) that are formed ot a ferromagnetic material Laminations 22 are stacked face- to-face and suitably adheied to one another by means conventionally known in the art
  • Stator 20 includes a plurality of like, inwardly extending stator poles 24 having inwaidly facing concave stator pole faces 26
  • stator 20 has eight (8) stator poles, designated 24a, 24b, 24c, 24d, 24e, 24f, 24g and 24h
  • a gap 28 is defined between adjacent stator poles 24 Stator pole faces 26 define a central bore 12 for receiving rotor 40
  • Phase windings 32a, 32b are alternately wound about every other stator pole 24 such that for every stator pole 24 ot one polarity there is a co ⁇ esponding pole of an opposite polarity
  • rotor 40 is commutated by mechanical means
  • a mechanical commutation assembly 70 is comprised of four commutation rings 72, 74, 76 and 78, a pair of power brushes 82, 84, a pan of A-phase pick-up brushes 92, 94 and a pair of B- phase pick-up brushes 96, 98
  • commutation rings 72, 74, 76 and 78 are essentially identical to each other and are arranged in complimentary pairs Since commutation rings 72, 74, 76 and 78 are essentially identical, only commutation ring 72 shall be described in detail, it being understood that such description applies equally to the others
  • Commutation ring 72 is basically comprised of an annular band 72a having outward extending tabs 72b (Similaily, commutation rings 74, 76 and 78 have annular bands 74a, 76a and 78a and tabs 74b.
  • commutation ring 72 includes four, equally spaced, like tabs 72b.
  • Tabs 72b are dimensioned to define like spaces between adjacent tabs 72b wherein two commutation rings may be positioned on rotor shaft 42 adjacent to one another, with the tabs of each respective ring disposed within the spaces of the other ring.
  • commutation ring 72 and commutation ring 74 are arranged in an interlocking, complimentary fashion and commutation ring 76 and commutation ring 78 are arranged in interlocking, complimentary fashion.
  • a gap 102 exists between adjacent tabs 72b, 74b and 76b, 78b.
  • Rings 72, 74, 76 and 78 are mounted onto rotor shaft 42 of rotor 40.
  • rotor shaft 42 is formed of metal.
  • an insulating sleeve 104 is disposed between commutation rings 72, 74, 76 and 78 and metal rotor shaft 42.
  • Tabs 72b, 74b, 76b and 78b are dimensioned to span a predetermined angular distance.
  • the angular dimension of each tab 72b, 74b, 76b, and 78b is related to the angular rotation of rotor 40 during each phase energization.
  • each tab 72b on commutation ring 72 is dimensioned wherein the surface of tab 72b spans an angular dimension equal to about forty-three angular degrees, wherein the open space between adjacent tabs 72b spans about forty-seven angular degrees.
  • tabs 74b, 76b and 78b of commutation rings 74, 76 and 78 also span about forty-three angular degrees, and the space between the respective tabs of a particular commutation ring spans about forty-seven angular degrees.
  • gap 102 spans about two angular degrees between a tab 72b on commutation ring 72 and a tab 74b on commutation ring 74.
  • the angular dimensions of the tabs and the spaces therebetween may vary.
  • each brush is essentially the same and is comprised of a conductive bar that is biased toward a commutation ring on rotor shaft 42.
  • brushes 82, 84, 92, 94, 96 and 98 are conductive bars, such as carbon or metal, of square cross-section. (It will, of course, be appreciated that the cross-sectional shape of the brushes is not critical, and the brushes may have other cross-section shapes such as rectangular, oval, round, triangular or the like, without deviating from the present invention).
  • brushes 82, 84, 92, 94, 96 and 98 are mounted within a single housing 112 that is shown in phantom in FIG. 4.
  • Housing 112 is formed of a non-conductive material to electrically isolate one brush from another.
  • Each brush 82, 84, 92, 94, 96 and 98 is basically mounted within a conductive sleeve 114 in like fashion, as shall now be described.
  • Each conductive sleeve 114 has a generally square cross-section and a closed bottom.
  • Sleeve 114 defines a cylindrical opening that is slightly larger than brush 82 to slidably receive brush 82 therein.
  • a biasing spring 122 is disposed within the opening of sleeve 114 between the bottom thereof and brush 82.
  • Biasing spring 122 is operable to bias brush 82 toward rotor shaft 42, and into engagement with tabs 72b, 74b of commutation rings 72, 74.
  • An electrical wire is connected to brush 82 and sleeve 114.
  • Brushes 84, 92, 94, 96 and 98 are mounted within housing 112 in a similar fashion, and are positioned relative to commutation rings 72, 74, 76 and 78, to engage select portions thereof.
  • the connector wire connects power brush 82 to the positive lead of a power source (not shown).
  • a connector wire connects to negative power brush 84 to the negative lead of the power source.
  • Wire leads connect A-phase pick-up brushes 92, 94 to respective opposite ends of phase- A windings 32a, and also connect B-phase pick-up brushes 96, 98 to the respective opposite ends of the phase-B windings 32b, as illustrated in FIGS. 3 and 4.
  • power brushes 82, 84, A-phase pick-up brushes 92, 94 and B-phase pick-up brushes 96, 98 are disposed adjacent to commutation rings 72,
  • Positive power brush 82, A- phase pick-up brush 92 and B-phase pick-up brush 96 are disposed adjacent rings 72, 74 to form a "positive commutation grouping." Specifically, A-phase pick-up brush 92 is disposed to engage annular band portion 72a of commutation ring 72. B-phase pick-up brush 96 is disposed to engage band portion 74a of commutation ring 74. Positive power brush 82 is positioned to engage tabs 72b, 74b of commutation rings 72, 74.
  • Negative power brush 84, A-phase pick-up brush 94 and B-phase pick-up brush 98 are disposed adjacent to commutation rings 76, 78 to form a "negative commutation grouping." Specifically, A-phase pick-up brush 94 is disposed to engage annular band portion 76a of commutation ring 76. B-phase pick-up brush 98 is disposed to engage annular band portion 78a of commutation ring 78. Negative power brush 84 is positioned to engage tabs 76b, 78b of commutation rings 76, 78.
  • a directional diode 132 is connected across the wiring lines connected to A-phase pick-up brush 92 and B-phase pick-up brush 98.
  • a second diode 134 is connected across the wiring lines connected to A-phase pick-up brush 94 and B-phase pick-up brush 96.
  • commutation rings 72, 74, 76 and 78 are mounted for rotation with rotor shaft 42.
  • commutation rings 72, 76 and commutation rings 74, 78 are in the same angular position on rotor shaft 42, such that positive power brush 82 and negative power brush 84 will engage the commutation rings 72 and 76 respectively or commutation rings 74, 78 respectively, at the same time.
  • FIG. 4 shows positive power brush 82 in contact with tab 72b of commutation ring 72 while negative power brush 84 is in contact with tab 76b of commutation ring 76. In this position, an electrical circuit is created through phase-A windings 32a.
  • commutation rings 72, 74, 76 and 78 on rotor shaft 42 is associated with the position of narrow rotor poles 44 and wide rotor poles 54 on rotor shaft 42.
  • commutation rings 72, 74, 76 and 78 are positioned on rotor shaft 42, such that as the leading edges of wide rotor poles 54 are approximately aligned with the edges of two stator poles 24 of one of the two phases, commutation rings 72, 74, 76 and 78 are positioned relative to positive and negative power brushes 82, 84 to energize that phase.
  • A-phase pick-up brushes 92, 94 are always in contact with annular portions 72a and 76a of commutation rings 72, 76 respectively, and B-phase pick-up brushes 96, 98 are always in contact with annular portions 74a and 78a of commutation rings 74, 78.
  • power brushes will contact both A-phase commutation tabs 72b, 76b and B-phase commutation tabs 74b, 78b, for a short period, as illustrated in FIG. 3.
  • power brushes 82, 84 move from exclusive contact with B-phase commutation tabs 74b and 78b into contact with A-phase commutation tabs 72b and 76b, and B-phase commutation tabs 74b and 78b thereby initiating energization of phase-A windings 32a while maintaining energization of phase-B windings 32b.
  • phase-B windings 32b de-energizes phase-B windings 32b as power brushes 82, 84 move off commutation tabs 74b and 78b into exclusive contact with A-phase commutation tabs 72b and 76b.
  • phase change from B-phase energization to A-phase energization preferably occurs when the leading edges of wide rotor poles 54 approach or slightly overlap the edges of an A-phase stator pole 24. Energization of the phase-A windings 32a, produces continued rotation of rotor 40.
  • FIGS. 5, 6 and 7 are circuit diagrams of a circuit 200 that schematically illustrates the operation of motor 10.
  • Circuit 200 includes a DC power source 150 for energizing phase-A windings 32a and phase-B windings 32b.
  • A-phase pick-up brushes 92, 94 and B-phase pick-up brushes 96, 98 are shown angularly disposed about rotor shaft 42.
  • Circuit 200 illustrates how phase-A windings
  • phase-B windings 32b are electrically connected to power source 150 via power brushes 82, 84, A-phase pick-up brushes 92, 94 and B-phase pick-up brushes
  • FIG. 5 shows how, in one position of rotor shaft 42, commutation rings 74, 78 (schematically shown as arc connectors) on rotor shaft 42 connect, respectively, power brush 82 to B-phase pick-up brush 96 and power brush 84 to B-phase pick-up brush 98 to complete a circuit from power source 150 through phase-B windings 32b to energize the same.
  • the arrows show the current path from power source 150 through phase-B windings 32b.
  • the circuit shown in FIG. 5 is created whenever rotor shaft 42 is in a position where power brushes 82, 84 are in contact with tabs 74b, 78b, respectively, of commutation rings 74, 78.
  • FIG. 5 shows how, in one position of rotor shaft 42, commutation rings 74, 78 (schematically shown as arc connectors) on rotor shaft 42 connect, respectively, power brush 82 to B-phase pick-up brush 96 and power brush 84 to B-phase
  • FIG. 6 shows circuit 200 during energization of phase A.
  • commutation rings 72, 76 also schematically shown as arc connectors
  • the arrow shows the current path from power source 150 through phase-A windings 32a.
  • the circuit shown in FIG. 6 is created whenever rotor shaft 42 is in a position where power brushes 82, 84 are in contact with tabs 72b, 76b, respectively, of commutation rings 72, 76.
  • the cross- sectional dimension of power brushes 82, 84 may be greater than space or gap 102, wherein power brush 82 will simultaneously contact tabs 72b, 74b in certain angular positions of rotor shaft 42.
  • the current paths are simultaneously created through phase-A windings 32a and through phase-B windings 32b, as schematically illustrated in FIG. 7.
  • the changing magnetic field experienced by the de- energized windings induces (i.e., creates) a current through such windings.
  • the direction of the induced current is the same as the direction of the original current that produced the original magnetic field in the now de-energized phase windings.
  • directional diodes 132, 134 direct current induced in de-energized windings into the windings being energized.
  • diode 132 is connected between the end of phase-B windings 32b and the beginning of phase-A windings 32a so as to allow current from phase-B windings 32b to flow through phase-A windings 32a.
  • directional diode 134 is connected between the end of phase-A windings 32a and the beginning of phase-B windings 32b so as to allow current from phase-A windings 32a to flow into phase-B windings 32b.
  • phase-B windings 32b In operation, current induced in phase-B windings 32b as a result of de-energization of such windings, is directed into phase-A windings 32a while such windings are being energized. Similarly, current induced in phase-A windings 32a caused by the de-energization of such windings, is directed into phase-B windings 32b while such windings are energized.
  • FIG. 8 schematically illustrates circuit 200 immediately after the de- energization of phase A and the energization of phase B.
  • the energization of phase-B windings 32b produces a current path similar to that illustrated in FIG. 5, wherein current from power source 150 is directed through commutation rings 74 and 78 through windings 32b.
  • a current depicted by wavy arrows, is induced in phase-A windings 32a by the de-energization of such windings. Since A- phase pick-up brushes 92, 94 are no longer directly connected to power brushes 82, 84, the current is directed through diodes 132, 134 to power source 150, and/or phase- B windings 32b.
  • the induced current is directed from phase-A windings 32a to the positive end of phase-B windings 32b via the circuit line containing directional diode 134.
  • the induced current is thus directed to the energized windings 32b.
  • current induced in phase-B windings 32b, during de- energization of such windings is directed to the positive side of phase-A windings 32a via the circuit line containing directional diode 132.
  • the aforementioned diode arrangement prevents the induced current generated by the de-energization of a phase from being dissipated as heat or from causing arcing as the respective phases are de-energized.
  • the mechanical commutation system 70 as heretofore described would be operable without directional diodes 132, 134, but the addition of such elements reduces overheating and arcing of the components and extends the life of brushes 82, 84, 92, 94, 96 and 98.
  • the angular dimension of commutation tabs 72b, 74b, 76b and 78b is related to the geometry of motor 10.
  • rotor 40 of motor 10 is designed to rotate about forty-five angular degrees per each phase energization.
  • mechanical commutation assembly 70 be operable to energize each phase to produce the rotation of rotor 40 for forty-five angular degrees.
  • each commutation tab 72b, 74b, 76b and 78b spans about forty-three angular degrees. The two angular degrees difference in between dimensions is to create the necessary separation, i.e., gap 102, between adjacent commutation tabs.
  • power brushes 82, 84 span about two angular degrees.
  • power brushes 82, 84 are about seven angular degrees wider than gap 102.
  • both phase A and phase B will be energized for about seven angular degrees of rotation of rotor shaft 42 as power brushes 82, 84 slide across gap 102 from one commutation tab to another.
  • FIG. 9 is a graph showing the energization profile for a motor 10 as heretofore described.
  • FIG. 9 illustrates the periods of simultaneous energization of phases A and B as a result of power brushes 82, 84 simultaneously contacting commutation rings for both phases A and B.
  • FIG. 10 is a static torque curve for motor 10 as heretofore described. The simultaneous overlap at the beginning of each phase energization reduces torque ripple, as illustrated in FIG. 10.
  • the gap or space 102 between adjacent commutation tabs 72b and 74b, or 76b and 78b may be increased or slightly decreased (a gap 102 between the commutation tabs must always exist) to adjust or modify the duration of each phase energization
  • FIG 1 1 shows a mechanical commutation assembly 70' illustrating an alternate embodiment of the present invention
  • adjacent commutation tabs 72b', 74b' are dimensioned to define a space or gap 102' of about fifteen angular degrees therebetween
  • gap 102' is filled with a non- conductive material, such as a plastic, and has a cylindrical outer surface matching the cylindrical outer surfaces of commutation tabs 72b', 74b'
  • Assembly 70' is shown with power brush 82, as heretofore described, having an angular dimension across its contacting face of about nine angular degrees The six degrees difference between the dimension of power brush 82 and gap 102' lesults in a period of no energization between energization of phases A and B
  • FIG 12 is a phase eneigization profile for a motor 10 having a commutation assembly 70' As seen in FIG 12, for a penod of about six angular degrees of rotation of rotor shaft 42, neither phase is energized
  • FIG 13 is a static toique curve for a motor 10 energized as shown in FIG 12
  • the penods of non-energization result in greater torque dips or drops between phases With a shorter phase energization, rotor
  • FIGS 1 1, 12 and 13 thus show how the dimension of gap 102 between commutation tabs 72b and 74b, and 76b and 78b affects the torque output of motor 10
  • a small gap 102 produces a more uniform torque profile, as seen in FIG 10 As the angular dimension of gap 102 increases, a noticeable torque dip or drop is created between each phase As will be appreciated by those skilled in the art, the embodiment shown in
  • FIGS 1 1, 12 and 13 has "dead spots" wherein rotor 40 may come to rest when the motor is not in operation Such a position is shown in FIG 11 wherein power brush
  • the invention may also be used on switched reluctance motors that do not have phase energization overlap, so long as any "dead zone” is overcome by a "parking magnet” or the like, or a starting torque to move the rotor from such dead zone.

Abstract

L'invention concerne un moteur à réluctance à commutation (10), équipé d'un stator (20) doté de pôles (24) définissant un trou (28) entre les pôles adjacents du stator (24). Des enroulements (32a, 32b) pour les deux phases sont enroulés autour des pôles du stator (24) de façon telle que les enroulements (32a, 32b) et les pôles du stator d'une phase sont séparés de façon circonférentielle par un enroulement et un pôle de stator associé (24) de l'autre phase. Chaque phase présente un terminal positif et un terminal négatif (114) alimentant les enroulements respectifs (32a, 32b) d'une phase. Un élément de rotor (40) présentant une pluralité de pôles de rotor espacés les uns par rapport aux autres (44) est monté de façon à pouvoir effectuer une rotation autour du stator (20). Les dimensions des pôles du rotor (44) sont telles que l'alimentation des phases entraîne une rotation angulaire prédéterminée du rotor (40). Des éléments conducteurs (72, 74, 76, 78) peuvent tourner avec le rotor (40) et sont reliés électriquement aux terminaux positifs et négatifs (114) des enroulements de phase. Des conducteurs d'alimentation (82, 84) reliés à une source de puissance électrique (150) viennent en prise avec les éléments conducteurs (72, 74, 76, 78) afin d'alimenter de façon alternative la première et la seconde phase pendant la rotation.
PCT/US2000/034327 2000-01-03 2000-12-18 Moteur a reluctance a commutation mecanique WO2001050578A1 (fr)

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AU24365/01A AU2436501A (en) 2000-01-03 2000-12-18 Mechanically commutated switched reluctance motor

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US47655300A 2000-01-03 2000-01-03
US09/476,553 2000-01-03

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Cited By (14)

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WO2002093718A1 (fr) * 2001-05-10 2002-11-21 Martin Robert M Moteur electromagnetique
WO2004086571A1 (fr) * 2003-03-24 2004-10-07 Dolphin Electric Holdings Inc Commutateur
US6822957B1 (en) 1998-03-05 2004-11-23 3Com Corporation Distributed network address translation for a network telephony system
US7285931B2 (en) 2005-08-31 2007-10-23 Schlumberger Technology Corporation Brushless motor commutation and control
US7285929B2 (en) 2005-08-31 2007-10-23 Schlumberger Technology Corporation Brushless motor commutation and control
ES2351900A1 (es) * 2008-07-16 2011-02-14 Antonio Rodriguez Cano Motor por electroimanes.
US20120175975A1 (en) * 2011-01-10 2012-07-12 Samsung Electro-Mechanics Co., Ltd. Switched reluctance motor
US20120175997A1 (en) * 2011-01-10 2012-07-12 Samsung Electro-Mechanics Co., Ltd. Switched reluctance motor
CN102761223A (zh) * 2011-04-28 2012-10-31 德昌电机(深圳)有限公司 有刷直流电机
CN102857056A (zh) * 2011-06-30 2013-01-02 德昌电机(深圳)有限公司 有刷直流电机
US20140043027A1 (en) * 2010-12-08 2014-02-13 Koninklijke Philips Electronics N.V. Slip ring assembly
DE102007016697B4 (de) * 2006-04-04 2015-05-13 Ford Global Technologies, Llc Wicklungsanordnung für eine elektrische Maschine
CN102857056B (zh) * 2011-06-30 2016-12-14 德昌电机(深圳)有限公司 有刷直流电机
WO2017168937A1 (fr) * 2016-03-28 2017-10-05 和徳 寺薗 Dispositif d'alimentation

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US6822957B1 (en) 1998-03-05 2004-11-23 3Com Corporation Distributed network address translation for a network telephony system
US6713933B2 (en) 2000-04-17 2004-03-30 Robert M. Martin Electromagnetic motor
WO2002093718A1 (fr) * 2001-05-10 2002-11-21 Martin Robert M Moteur electromagnetique
WO2004086571A1 (fr) * 2003-03-24 2004-10-07 Dolphin Electric Holdings Inc Commutateur
US7285931B2 (en) 2005-08-31 2007-10-23 Schlumberger Technology Corporation Brushless motor commutation and control
US7285929B2 (en) 2005-08-31 2007-10-23 Schlumberger Technology Corporation Brushless motor commutation and control
DE102007016697B4 (de) * 2006-04-04 2015-05-13 Ford Global Technologies, Llc Wicklungsanordnung für eine elektrische Maschine
WO2007144820A2 (fr) * 2006-06-12 2007-12-21 Schlumberger Canada Limited Commutation et commande de moteur sans balais
WO2007144820A3 (fr) * 2006-06-12 2008-03-06 Schlumberger Ca Ltd Commutation et commande de moteur sans balais
ES2351900A1 (es) * 2008-07-16 2011-02-14 Antonio Rodriguez Cano Motor por electroimanes.
US9608395B2 (en) * 2010-12-08 2017-03-28 Koninklijke Philips N.V. Slip ring assembly
US20140043027A1 (en) * 2010-12-08 2014-02-13 Koninklijke Philips Electronics N.V. Slip ring assembly
US20120175975A1 (en) * 2011-01-10 2012-07-12 Samsung Electro-Mechanics Co., Ltd. Switched reluctance motor
US20120175997A1 (en) * 2011-01-10 2012-07-12 Samsung Electro-Mechanics Co., Ltd. Switched reluctance motor
JP2012147652A (ja) * 2011-01-10 2012-08-02 Samsung Electro-Mechanics Co Ltd スイッチトリラクタンスモータ
CN102761223B (zh) * 2011-04-28 2016-04-13 德昌电机(深圳)有限公司 有刷直流电机
CN102761223A (zh) * 2011-04-28 2012-10-31 德昌电机(深圳)有限公司 有刷直流电机
CN102857056A (zh) * 2011-06-30 2013-01-02 德昌电机(深圳)有限公司 有刷直流电机
CN102857056B (zh) * 2011-06-30 2016-12-14 德昌电机(深圳)有限公司 有刷直流电机
WO2017168937A1 (fr) * 2016-03-28 2017-10-05 和徳 寺薗 Dispositif d'alimentation
JP6271827B1 (ja) * 2016-03-28 2018-01-31 和徳 寺薗 動力装置

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