WO2021013575A1 - Dispositif de couplage magnétique - Google Patents

Dispositif de couplage magnétique Download PDF

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Publication number
WO2021013575A1
WO2021013575A1 PCT/EP2020/069458 EP2020069458W WO2021013575A1 WO 2021013575 A1 WO2021013575 A1 WO 2021013575A1 EP 2020069458 W EP2020069458 W EP 2020069458W WO 2021013575 A1 WO2021013575 A1 WO 2021013575A1
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WO
WIPO (PCT)
Prior art keywords
permanent magnets
coupling device
air gap
distance
coupling
Prior art date
Application number
PCT/EP2020/069458
Other languages
German (de)
English (en)
Inventor
Markus Golder
Original Assignee
Stahl Cranesystems Gmbh
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 Stahl Cranesystems Gmbh filed Critical Stahl Cranesystems Gmbh
Publication of WO2021013575A1 publication Critical patent/WO2021013575A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K49/00—Dynamo-electric clutches; Dynamo-electric brakes
    • H02K49/10—Dynamo-electric clutches; Dynamo-electric brakes of the permanent-magnet type
    • H02K49/104—Magnetic couplings consisting of only two coaxial rotary elements, i.e. the driving element and the driven element
    • H02K49/106—Magnetic couplings consisting of only two coaxial rotary elements, i.e. the driving element and the driven element with a radial air gap
    • 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
    • H02K1/2786—Outer rotors
    • H02K1/2787—Outer rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/2789—Outer rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2791—Surface mounted magnets; Inset magnets
    • 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
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information

Definitions

  • the invention relates to a magnetic coupling device having a first coupling part and a second coupling part.
  • An air gap is limited between the two coupling parts.
  • the two coupling parts are coupled to one another via a magnetic field penetrating the air gap.
  • the coupling device can be used, for example, for hysteresis couplings, electric motors or linear motors.
  • US 3,573,518 A describes a hysteresis coupling with two coupling parts which are connected to different shafts.
  • a coupling part has ceramic magnets which are arranged in a circumferential direction concentrically to the axis of rotation of the shafts and are polarized in the circumferential direction.
  • Pole pieces which have a substantially trapezoidal cross section are arranged between the magnets.
  • EP 2 696 469 B1 discloses a rotor for a synchronous machine which has permanent magnets with a trapezoidal cross section.
  • the permanent magnets are arranged in pockets of a laminated core of the rotor.
  • a coupling device in which cuboid permanent magnets are arranged on a rotor, which are polarized in the circumferential direction.
  • the radial dimension should be at least twice as large as a width of the permanent magnets that is measured tangentially to the circumferential direction.
  • the coupling device has a first coupling part and a second coupling part which delimit an air gap therebetween.
  • the two coupling parts are magnetically coupled to one another by a magnetic field that extends through the air gap between the two coupling parts.
  • the coupling device can be used, for example, to form a hysteresis coupling.
  • the coupling device can also be used to build linear motors or rotary-driven electric motors.
  • the first coupling part has a plurality of permanent magnets which are arranged next to one another parallel to the air gap in a direction which is hereinafter referred to as the arrangement direction.
  • the first permanent magnets are polarized in the arrangement direction.
  • first permanent magnets present immediately adjacent in the direction of arrangement have opposing polarizations.
  • Each first permanent magnet is arranged in an inter mediate space between two pole pieces arranged next to one another in the arrangement direction.
  • the pole pieces are made of magnetizable material, in particular of at least one ferromagnetic and / or magnetically soft material.
  • the first permanent magnets have a square cross-section, their corner points forming a trapezoid, in particular an isosceles trapezoid.
  • the cross section of the first permanent magnets tapers towards the air gap.
  • the cross section of the first permanent magnets is preferably constant.
  • the cross section of the first permanent magnets is gebil det in a plane at right angles to the depth direction.
  • the two corner points of the trapezoid of the cross section of the first permanent magnets, which are arranged closer to the air gap, are hereinafter referred to as corner points near the air gap.
  • the shortest distance along a straight line between the two corner points near the air gap forms a first distance.
  • the two corner points of the trapezoid that are arranged in the transverse direction with a larger distance from the air gap are referred to below as corner points remote from the air gap.
  • the shortest distance along a straight line between the two corner points remote from the air gap forms a second stand.
  • the second distance is at least 2.5 times as large as the first distance.
  • the first permanent magnets preferably form a prismatic body.
  • the pole pieces of the first coupling part have a cross section at right angles to the depth direction, which increases towards the air gap.
  • the first permanent magnets can be rare earth magnets and have, for example, neodymium, samarium, pra seodymium, dysprosium, terbium, gadolinium or yttrium.
  • the first permanent magnets can be made from an alloy comprising one of the mentioned rare earth metals as well as iron or cobalt or nickel.
  • the first permanent magnets are expensive and there is therefore a need to minimize their volume. However, it must also be ensured that the magnetic coupling or force of the first permanent magnets is sufficiently large so that the desired coupling torque or the desired coupling force is achieved between the coupling parts.
  • the cross-sectional shape of the first permanent magnets leads to a significant gain in efficiency.
  • This trapezoidal shape ensures that the first permanent magnets form a magnetic flux into the adjacent pole pieces and a stray field from the permanent magnets into the air gap is minimized.
  • the invention is also based on the knowledge that the ratio of the two opposite sides of a preferably isosceles trapezoid of different lengths in the claimed area offers particularly high efficiency with regard to the use of material and the achievable coupling torque or the achievable coupling force.
  • the second distance is at most 3.5 times as large as the first distance.
  • a further increase in the second distance compared to the first distance does not lead to any gain in terms of the achievable coupling torque or the achievable coupling force.
  • a height that is greater than the second distance is preferably at least 4 times as great as the first distance. It is also advantageous if the height of the trapezoid is at most 6 times as great as the first distance.
  • the volume of a pole piece is at least twice as large as the volume of a first permanent magnet. It is also advantageous if the volume of a pole piece is at most 3 times as large as the volume of a first permanent magnet.
  • the volume of the pole pieces must be large enough to accommodate the magnetic flux of the first permanent magnets.
  • the specified dimensioning of the volume enables optimization to be achieved in which stray fields are minimized and the flux density through the air gap is optimized.
  • the two first permanent magnets directly adjoining a common pole piece on different sides are mutually polarized in the preferred embodiment.
  • the pole piece arranged in between therefore corresponds to either a magnetic north pole or a magnetic south pole.
  • each first permanent magnet has two contact surfaces present on opposite sides in the direction of arrangement, each contact surface bearing against an adjacent pole piece, preferably flat. Under a flat contact is in In this context, to understand a substantially uninterrupted system over the entire contact surface.
  • Each pole piece can have two opposing contact surfaces which are arranged on opposite sides in the direction of arrangement.
  • a directly adjacent first permanent magnet is in contact with each opposing contact surface.
  • each contact surface and / or each counter contact surface has an angle of inclination with respect to the transverse direction which is in the range from 5 ° to 20 ° and preferably from 7 ° to 17.5 °. It is preferred if a contact surface and a counter-contact surface adjacent to it have the same angle of inclination, so that a flat contact can be achieved. It is particularly advantageous if all contact surfaces and all counter contact surfaces have the same angle of inclination.
  • the pole pieces of the first coupling part can be connected to one another in the transverse direction at a distance from the air gap.
  • the pole pieces of the first coupling part are preferably not directly connected to one another.
  • the pole pieces, viewed in the transverse direction, at the level of the intermediate spaces and in the transverse direction between the air gap and the intermediate space are not connected to one another by magnetizable material.
  • first permanent magnets are arranged in the spaces between the pole pieces without an adhesion promoter connection or adhesive connection.
  • the first permanent magnets be held or secured in the spaces by a mechanical holding means.
  • the second coupling part has a plurality of second permanent magnets arranged next to one another in the direction of arrangement. This is preferred, for example, when the coupling device forms a hysteresis coupling.
  • the second permanent magnets other elements which form a magnetic field can also be present, such as coils. Using coils, for example, a moving magnetic field can be generated to build a motor.
  • the amount of the coercive field strength of the first permanent magnets is greater than the amount of the coercive field strength of the second permanent magnets.
  • the second permanent magnets are polarized in the direction of arrangement.
  • the arrangement direction can extend along a straight line or alternatively along a circular path.
  • Linear as well as rotary coupling devices can thus be implemented.
  • the first coupling part forms a rotor and the second coupling part forms a stator if a rotary or linear drive is to be formed.
  • both coupling parts can be moved linearly or in rotation.
  • Figure 1 shows an embodiment of a coupling device in the form of a hysteresis coupling, the first coupling part and the second coupling part are rotatably mounted about a common axis of rotation,
  • FIG. 2 shows a schematic representation of a further exemplary embodiment of a coupling device in the form of a hysteresis coupling, the two coupling parts being mounted so as to be linearly movable,
  • FIG. 3 shows an enlarged basic representation of the shape of a first permanent magnet and a pole piece of a first coupling part corresponding to FIGS. 1 or
  • FIG. 4 shows an alternative embodiment of a first permanent magnet in a side view
  • Figure 5 is a schematic plan view of a second coupling part of a coupling device with several ren groups of second permanent magnets, which are arranged offset from one another in an arrangement direction
  • Figure 6 is a schematic diagram illustrating the magnetic flux density depending on the magnetic field strength for first permanent magnets of the first coupling part and second permanent magnets of the second coupling part ver.
  • FIGS. 1 and 2 an exemplary embodiment of a coupling device 10 is schematically illustrated, the coupling devices 10 each forming a hysteresis clutch 11 in these exemplary embodiments.
  • the coupling device 10 each has a first coupling part 12 and a second coupling part 13.
  • An air gap 14 is delimited between the first coupling part 12 and the second coupling part 13.
  • the coupling parts 12, 13 are magnetically coupled to one another by a magnetic field penetrating the air gap 14.
  • the two coupling parts 12, 13 are each mounted rotatably about a common axis of rotation 15 movable.
  • Each coupling part 12, 13 can be connected to a shaft which are to be coupled to one another with means of the hysteresis clutch 11.
  • the coupling parts 12, 13 are mounted movably in a linear direction of movement.
  • the first coupling part 12 has a plurality of first permanent magnets 16 arranged next to one another in an arrangement direction R.
  • the first permanent magnets are preferably made of a hard magnetic material.
  • the first permanent magnets 16 are polarized in the R arrangement direction.
  • the arrangement direction R is for the execution example according to FIG. 1 formed by the circumferential direction about the axis of rotation 15. In the embodiment according to Figure 2, the arrangement direction R is formed by the direction in which the first coupling part 12 and the second coupling part 13 are movably mounted.
  • the first coupling part 12 also has pole pieces 17 made of a magnetizable material.
  • the number of pole pieces 17 corresponds to the number of first permanent magnets 16.
  • the first permanent magnets 16 have a cross section, the four corner points 18a and 18b of which form a trapezoid 19, for example an isosceles trapezoid 19.
  • the cross-sectional plane is oriented at right angles to a depth direction T. .
  • the depth direction T and the arrangement direction R span a plane or surface parallel to which the air gap 14 extends.
  • a transverse direction Q is oriented at right angles to the arrangement direction R and to the depth direction T.
  • the cross-sectional plane therefore extends parallel to a plane spanned by the transverse direction Q and the arrangement direction R.
  • the shortest distance along a straight line between the two corner points 18a near the air gap forms a first distance a.
  • the shortest distance along a straight line between the two corner points 18b remote from the air gap forms a second distance b.
  • the trapezoidal cross section of the first permanent magnet 16 is constant in the depth direction T.
  • the air gap 14 extends parallel to a plane or surface that is spanned by the arrangement direction R and the depth direction T.
  • the depth direction T corresponds to an axial direction parallel to the axis of rotation 15.
  • the transverse direction Q in this embodiment is a radial direction at right angles to the axis of rotation 15.
  • the air gap is in particular hollow-cylindrical.
  • the depth direction T is oriented at right angles to the plane of the drawing.
  • a pole piece 17 alternates with a first permanent magnet 16.
  • Each first permanent magnet 16 is thus arranged in an intermediate space 23 between two directly adjacent pole pieces 17.
  • Each first permanent magnet 16 has a contact surface 24 on its two opposite sides in the arrangement direction R.
  • Each contact surface 24 is located a mating contact surface 25 of the immediately adjacent pole piece 17 opposite.
  • Two opposing contact surfaces 25 of directly adjacent pole pieces 17 each delimit an intermediate space 23 for a first permanent magnet 16.
  • a contact surface 24 rests on a counter contact surface 25 and preferably forms a substantially uninterrupted flat contact.
  • the contact surfaces 24 and the counter-contact surfaces 25 are aligned parallel to the depth direction and are inclined at an angle of inclination with respect to the arrangement direction R.
  • a plane which extends parallel to a contact surface 24 and the opposing contact surface 25 resting thereon is neither parallel to the arrangement direction R nor parallel to the transverse direction Q.
  • the angle of inclination is at least 5 ° and preferably at least 7 °.
  • the angle of inclination is preferably less than 20 ° and more preferably less than 17.5 °.
  • the second distance b of the corner points 18b remote from the air gap is at least 2.5 times greater than the first distance a of the corner points 18a on the air gap side. It is also advantageous if the height h of the trapezoid 19 or the height h of the first permanent magnets 16 is greater than the second distance b between the two corner points 18b remote from the air gap. It has also been shown that any enlargement of the height h compared to the first distance a and / or of the second distance b compared to the first distance a does not make sense in terms of efficiency.
  • the dimensions of the first permanent magnets 16 meet the following conditions:
  • each intermediate space 23 exactly one first permanent magnet 16 is arranged.
  • the first permanent magnet 16 is formed from an integral body.
  • the first permanent magnets 16 are arranged in the intermediate space 23 free of an adhesive bond. In particular, there is no bonding layer or adhesive layer between the first permanent magnet 16 and the two pole pieces 17 that limit the space 23.
  • the first permanent magnets 16 are inserted into the space 23 tapering towards the air gap 14 and are held there mechanically.
  • a suitable mechanical restraint means can be present that secures one or more or all of the first permanent magnets 16 in the space 23.
  • the securing means can act positively and / or positively on one or more or all of the first permanent magnets 16 in the depth direction T and / or the transverse direction Q.
  • the pole pieces 17 are also trapezoidal in cross-section when viewed parallel to the depth direction T. forms, the cross section of which increases towards the air gap 14.
  • the trapezoidal shape is due to the arrangement of the Jacoban contact surfaces 25 at the angle of inclination.
  • the pole pieces 17 can have a height which corresponds to the height h of the first permanent magnets 16 (FIG. 3).
  • the height of the pole pieces 17 can also be somewhat greater than the height h of the first permanent magnets 16.
  • the first permanent magnets 16 each have a depth c ( Figure 3).
  • a depth of the pole pieces 17 is preferably the same as the depth c of the first permanent magnets 16.
  • the depth of the pole pieces 17 could also be somewhat greater than the depth c of the first permanent magnets 16.
  • the first permanent magnets 16 are magnetized in opposite directions in the arrangement direction R such that two magnetic south poles S or two magnetic north poles N each directly adjoin a pole piece 17, as illustrated in FIGS. 1 and 2.
  • each pole piece 17 forms either a magnetic south pole S or a magnetic north pole N.
  • the magnetic field lines of a magnetic field that is formed due to the magnetic flux of the first permanent magnets 16 therefore run from a pole piece 17 forming a magnetic north pole N to a magnetic one South pole S forming pole piece 17 ( Figure 2).
  • the efficiency in utilizing the magnetic flux is particularly high when the volume of a pole piece 17 is at least 2 times as large as the volume of a first permanent magnet 16 and preferably at most 3 times as large as the volume of one first perma- magnet 16.
  • the second coupling part 13 has a plurality of second permanent magnets 30 which are arranged next to one another in the direction R of order.
  • the two permanent magnets 30 are arranged on a holder 31 of the second coupling part 13.
  • the second permanent magnets 30 are polarized in the arrangement direction R or are polarized in the arrangement direction R by the stronger first permanent magnets 16.
  • a gap or gap can be present between two immediately adjacent second permanent magnets 30.
  • the holder 31 can be formed in the depth direction T by several relatively insulated metal sheets, for example by several sheets of metal or a metallic alloy.
  • the carrier 31 can be made of a non-electrically conductive and / or non-magnetizable material. Aluminum or an aluminum alloy, plastic or a composite material, for example, can be used as the material for the carrier.
  • the second permanent magnets 30 adjoin the air gap 14 with one side, so that together with the first permanent magnets 16 and the pole pieces 17 they delimit the air gap 14 in the transverse direction Q from opposite sides.
  • the second permanent magnets 30 can be arranged in the direction R along a circular path around the axis of rotation 15 (FIG. 1) or linearly next to one another (FIG. 2).
  • the first coupling part 12 has a first number NI of first permanent magnets 16.
  • the second coupling part 13 has a second number N2 of second permanent magnets 30.
  • the first number NI and the second number N2 are relatively prime. That is, there is no natural number other than one, which forms both a divisor for the first number NI and a divisor for the second number N2.
  • the first number NI and the second number N2 are preferably selected as an alternative or in addition to the coprime numbers such that the following condition is met:
  • first number NI is relatively prime to the second number N2
  • different pole angles result for the first coupling part 12 and the second for a rotary arrangement as shown in FIG Coupling part 13. Transferred to the linear arrangement in Figure 2, this means that central planes at right angles to the arrangement direction R, which run through the first permanent magnets 16, have a pole spacing from one another that is different from a pole spacing between two adjacent central planes perpendicular to the arrangement direction R through the second permanent magnets 30.
  • the first permanent magnets 16 have an outer surface adjacent to the air gap 14, which is defined by the corner points 18a near the air gap and which extends in a plane.
  • the outer surface remote from the air gap in the transverse direction Q on the opposite side, which is defined by the corner points 18b remote from the air gap, preferably also extends in one plane and in particular parallel to the outer surface near the air gap.
  • the outer surface close to the air gap and / or remote from the air gap extends along a section of a cylinder jacket surface around the axis of rotation 15, for example in the case of a coupling device 10 according to FIG. 1.
  • the curvature of the outer surfaces close to the air gap and remote from the air gap is shown schematically in Figure 4 illustrates.
  • a first characteristic curve is shown schematically in FIG K1 for the first permanent magnets 16 and a second characteristic curve K2 for the second permanent magnets 30 is illustrated.
  • the first permanent magnets 16 have a first coercive field strength HCl, the amount of which is greater than the amount of a second coercive field strength HC2 of the second permanent magnets 30.
  • the first permanent magnets 16 have a first remanent flux density BR1 that is greater as a second remanent flux density BR2 of the second permanent magnets 30.
  • the stronger first permanent magnets 16 are to be regarded as the source that magnetize the second permanent magnets 30. Therefore, the second characteristic curve K2 is illustrated mirrored with respect to the B-axis.
  • the first saturation magnetization BS1 of the first permanent magnets 16 is greater than the second saturation magnetization BS2 of the second permanent magnets 30.
  • the first coercive force HCl can be greater than 1000 kA / m.
  • the first permanent magnet 16 preferably has an energy product that is greater than 100 kJ / m 3 or greater than 200 kJ / m 3 .
  • the first permanent magnets 16 may, for example, be made of an alloy containing neodymium, iron and boron.
  • the second permanent magnets 30 can for example consist of an alloy containing aluminum, nickel and cobalt.
  • FIG 2 the course is highly schematic of magnetic field lines M in the air gap 14 and in the second Per manentmagneten 30 illustrated.
  • the magnetic field lines M run from a pole piece 17 forming a magnetic north pole N through the air gap 14, enter the second permanent magnet 30 at a magnetic south pole S, exit at the second permanent magnet 30 at the magnetic north pole N, pass through the air gap 14 again and enter a pole piece 17 which forms a south magnetic pole S.
  • the magnetic flux that results from a cut surface of the second permanent magnet 30 causes a flux density in the second magnet 30 depending on the surface content of a cut surface at right angles to the arrangement direction R.
  • the surface content of the cut surface is preferably selected at right angles to the arrangement direction R such that a flux density is achieved in the second permanent magnet 30 which corresponds at most to the second saturation magnetization BS2. Preference is nowhere on this cut surface
  • the surface area of this sectional area is preferably dimensioned in such a way that the second saturation magnetization BS2 is reached at least at one point in order to achieve the maximum transferable coupling torque or the maximum transferable coupling force between the two coupling parts 12, 13.
  • FIG. 5 a further exemplary embodiment for realizing the second coupling part 13 is illustrated.
  • the depth direction T several rows or groups of second permanent magnets 30 are arranged next to one another, each of which is offset from one another in the arrangement direction R, for example by a distance d.
  • a first group pe 32, a second group 33 and a third group 34 are present, all groups 32, 33, 34 having the same number of second permanent magnets 30.
  • the distance d is smaller than the length of the second permanent magnets 30 in the arrangement direction R.
  • the offset or the distance d are chosen such that the gaps or gaps between the second permanent magnets 30 of a group in the depth direction T are not aligned with the gaps or gaps of all other groups.
  • the hysteresis clutch 11 Using the example of the hysteresis clutch 11 according to FIG. 1, its mode of operation is explained below. If the first coupling part 12 or the second coupling part 13 is driven about the axis of rotation 15, the first permanent magnets 16, together with the pole pieces 17, generate a magnetic field that penetrates the air gap 14 and the second permanent magnets 30. This creates a magnetic coupling between the two coupling parts 12, 13. Depending on the dimensioning, the non-driven coupling part can be carried along by the driven coupling part and also rotates around the axis of rotation 15. As soon as the slip limit defined by the hysteresis coupling 11 is reached, there is a relative rotation of the two coupling parts 12, 13 to each other instead.
  • the magnetic poles induced by the first permanent magnets 16 or the pole pieces 17 on the facing sides of the second permanent magnets 30 are shifted in the arrangement direction R relative to the magnetic poles of the pole pieces 17.
  • the induced poles of the second magnet 19 are based on the magnetization of the magnetic material of the second permanent magnets 30 - if possible up to the second saturation magnetization BS2. If this shift of the induced th magnetic poles on the second permanent magnet 30 reaches or exceeds the second coercive force HC2, the induced poles begin to migrate in the direction R along the second permanent magnets 30, whereby no torque or no force between the two coupling parts 12, 13 are transmitted without slip can.
  • a hysteresis coupling with linearly moving coupling parts 12, 13, as illustrated in FIG. 2 works on the same principle, so that reference can be made to the above explanation.
  • the invention relates to a coupling device 10 having a first coupling part 12 and a second coupling part 13, which are magnetically coupled to one another. There is an air gap between the coupling parts 12, 13
  • the second coupling part 13 has trapezoidal first permanent magnets 16 in cross-section, each first permanent magnet 16 being arranged in an intermediate space 23 between two pole pieces 17 of the first coupling part 12.
  • a trapezoid 19 of the cross section of the first permanent magnet 16 is defined by four corner points, two corner points 18a on the air gap side and two corner points 18b remote from the air gap.
  • the shortest distance between the two corner points 18a on the air gap side defines a first distance from a and the shortest distance between the two corner points 18b away from the air gap defines a second distance b.
  • the second distance b is at least 2.5 times larger than the first distance a and preferably at most 3.5 times larger than the first distance a.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)

Abstract

La présente invention concerne un dispositif de couplage magnétique (10) ayant une première partie de couplage (12) et une seconde partie de couplage (13) qui sont couplées entre elles par effet magnétique. Un entrefer (14) est délimité entre les parties de couplage (12, 13). La seconde partie de couplage (13) comprend des premiers aimants permanents (16) ayant une section transversale trapézoïdale, chaque premier aimant permanent (16) étant disposé dans un espace intermédiaire (23) entre deux pièces polaires (17) de la première partie de couplage (12). Un trapèze (19) de la section transversale du premier aimant permanent (16) est défini par quatre sommets, deux sommets proches de l'entrefer (18a) et deux sommets éloignés de l'entrefer (18b). La distance la plus courte entre les deux sommets proches de l'entrefer (18a) définit une première distance (a) et la distance la plus courte entre les deux sommets éloignés de l'entrefer (18b) définit une seconde distance (b). La seconde distance (b) est au moins 2,5 fois plus grande que la plus première distance (a) et, de préférence, au plus 3,5 fois plus grande que la première distance (a).
PCT/EP2020/069458 2019-07-19 2020-07-09 Dispositif de couplage magnétique WO2021013575A1 (fr)

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Application Number Priority Date Filing Date Title
DE102019119680.9 2019-07-19
DE102019119680.9A DE102019119680B4 (de) 2019-07-19 2019-07-19 Magnetische Kopplungsvorrichtung

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WO2021013575A1 true WO2021013575A1 (fr) 2021-01-28

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FR2937390A1 (fr) * 2008-10-16 2010-04-23 Valeo Equip Electr Moteur Organe de transmission de mouvement et machine tournante equipee d'un tel organe
EP2395635A1 (fr) 2010-06-11 2011-12-14 Ringfeder Power-Transmission GmbH Embrayage à aimants permanents
EP2696469B1 (fr) 2012-08-09 2015-06-17 Siemens Aktiengesellschaft Rotor pour une machine synchrone à excitation permanente

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