WO2019110410A1 - Moteur électrique - Google Patents

Moteur électrique Download PDF

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Publication number
WO2019110410A1
WO2019110410A1 PCT/EP2018/082970 EP2018082970W WO2019110410A1 WO 2019110410 A1 WO2019110410 A1 WO 2019110410A1 EP 2018082970 W EP2018082970 W EP 2018082970W WO 2019110410 A1 WO2019110410 A1 WO 2019110410A1
Authority
WO
WIPO (PCT)
Prior art keywords
electric motor
rotor
motor shaft
contacting element
nonwoven fabric
Prior art date
Application number
PCT/EP2018/082970
Other languages
German (de)
English (en)
Inventor
Lakshmi Narayanan MUTHU
Uwe Roessler
Original Assignee
Robert Bosch 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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2019110410A1 publication Critical patent/WO2019110410A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/40—Structural association with grounding devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C41/00—Other accessories, e.g. devices integrated in the bearing not relating to the bearing function as such
    • F16C41/002—Conductive elements, e.g. to prevent static electricity
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/173—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings
    • H02K5/1737—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings radially supporting the rotor around a fixed spindle; radially supporting the rotor directly
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
    • F16C19/08—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with two or more rows of balls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2202/00—Solid materials defined by their properties
    • F16C2202/30—Electric properties; Magnetic properties
    • F16C2202/32—Conductivity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
    • F16C2208/20—Thermoplastic resins
    • F16C2208/30—Fluoropolymers
    • F16C2208/32—Polytetrafluorethylene [PTFE]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2212/00—Natural materials, i.e. based on animal or plant products such as leather, wood or cotton or extracted therefrom, e.g. lignin
    • F16C2212/08—Woven, unwoven fabrics, e.g. felt
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
    • F16C2240/40—Linear dimensions, e.g. length, radius, thickness, gap
    • F16C2240/70—Diameters; Radii
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2380/00—Electrical apparatus
    • F16C2380/26—Dynamo-electric machines or combinations therewith, e.g. electro-motors and generators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F16C35/063—Fixing them on the shaft
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F16C35/067—Fixing them in a housing
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/02—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for suppression of electromagnetic interference

Definitions

  • the invention relates to an electric motor according to the preamble of the independent claim.
  • Electromechanical commutation of motors produces electromagnetic waves that are emitted into the environment. These occurring electromagnetic waves should be reduced.
  • the motor shaft is connected via an electrically conductive connecting element
  • connecting element acts on the end face of the motor shaft and on
  • the invention relates to an electric motor, in particular an external rotor motor, with a rotor, a stator and a motor shaft, wherein the motor shaft is associated with the stator or the rotor and a Has axis of rotation about which rotor and stator to each other by means of at least one rolling bearing, which has at least one end face, are rotatably mounted, and wherein the motor shaft a
  • Contacting element is arranged, which is in contact with the at least one roller bearing and on the lateral surface of the motor shaft and, alternatively or additionally, the end face of the rolling bearing to this movable, in particular rotatably applied. It is proposed that the contacting element is at least partially formed from an electrically conductive nonwoven fabric.
  • Claim has the advantage that the contacting element can be installed in a particularly space-saving and easy.
  • a Kunststoffierlementes which is at least partially formed of an electrically conductive nonwoven fabric, also undesirable squeaking noise can be further minimized in an advantageous manner.
  • the nonwoven fabric according to the invention is optimized with respect to its sliding properties and at the same time has good electrical conductivity. Even with a radial
  • nonwoven may in the present case a
  • Spun fibers or filaments and / or fibers with a degree of slimming that is with a ratio of fiber length in mm to
  • Fiber diameter in mm of at least 300 can be.
  • the fibers are interconnected in the nonwoven fabric by entanglement and / or cohesion and / or adhesion, wherein the character-determining fibers can be oriented in the nonwoven fabric and / or arranged confused.
  • the fibers are oriented in such a way that they form a brush-like structure.
  • Axis to which a body, in particular the rotor, in the
  • motor shaft understood an objective machine element
  • Rolling the surface of the rolling bearing are understood, which extends in a plane perpendicular or substantially perpendicular to the axis of rotation of the motor shaft.
  • the End face limits the rolling bearing axially along the axis of rotation.
  • the term end face is not limited to a flat surface, but the end face can be any
  • Outer surface of the motor shaft that surface of the motor shaft are understood, which extends circumferentially in the axial direction, that is, in the direction of the axis of rotation.
  • the term lateral surface is not limited to a cylindrical surface, but the
  • Jacket surface projections and recesses include.
  • the rotor and stator are connected to one another by means of at least one
  • Motor support or stator be firmly clamped, so that the rotor in operation to the
  • the electric motor is designed such that the contacting element is stationary, that is not co-rotated during operation of the electric motor. In this way, the nonwoven fabric is exposed to lower shear loads.
  • the electric motor is designed such that the contacting element is stationary, that is not co-rotated during operation of the electric motor. In this way, the nonwoven fabric is exposed to lower shear loads.
  • the electric motor is designed as an external rotor motor.
  • the shielding effect of the rotor itself can be used to improve the electromagnetic compatibility in an advantageous manner.
  • the contacting is rotatably connected to the at least one rolling bearing.
  • rotationally fixed is also to be understood that the smallest relative movements between the contacting element and the rolling bearing can occur in the region of the rotationally fixed connection.
  • the rolling bearing has an inner ring and an outer ring, wherein the contacting element is rotatably connected to the outer ring and movable on the inner ring, in particular rotatably.
  • the overarching distance can be kept low in an advantageous manner.
  • bearings have a plurality of electrically conductive
  • Such a grinding contact via the electrically conductive nonwoven fabric has the advantage that the frictional force and concomitantly the wear of the contacting element can be minimized.
  • the electrically conductive nonwoven material abrades both on the end face of the inner ring of the rolling bearing and on the lateral surface of the motor shaft.
  • Potential equalization can be done via the corresponding second sliding contact surface.
  • the contacting element is integrally formed from an electrically conductive nonwoven fabric.
  • Embodiment can be particularly easy to produce and assemble.
  • a particularly simple and cost-effective embodiment of the invention can be provided by the fact that the electrically conductive nonwoven fabric and the rolling bearing are bonded together.
  • the contacting element is formed at least in two parts and at least one support element and an insert element, wherein the T ragelement and the insert element connected to each other, in particular glued together.
  • Einlegeelement also provides a non-rotatable, stable
  • a support element can be understood as a support body which is stiffer with respect to the insertion element and thus assumes a supporting function for the insertion element according to the invention.
  • a support member may be formed, for example, of a metallic material.
  • the support element is formed from a plastic, insofar as it is suitable due to its material properties to provide a supporting effect for the insert element.
  • Insertion element to be understood a component which is arranged in or on the support member and at least partially formed of an electrically conductive nonwoven fabric.
  • the invention is not limited to a recessed in the support element insert element. Rather, it can also be foreseen that the insert element the
  • T ragelement at least partially engages.
  • the invention is not limited to a one-piece insert element.
  • the insert element is designed in several parts. Essential to the invention here is only that the insert element forms the one component which is movable, or rotatably applied to rotating in operation components.
  • the insert element formed as an annular disc.
  • Such a flat disc can be provided in a space-saving manner under optimal utilization of the available space.
  • the contacting element has an inner diameter which is smaller than the outer diameter of the motor shaft.
  • the inner diameter of the motor shaft is smaller than the outer diameter of the motor shaft.
  • the nonwoven fabric has a high lubricity and at the same time a small specific resistance, in particular a
  • Characteristics of balancing potential differences between the rotor and the stator are provided secured.
  • These advantageous material properties of the nonwoven fabric can be provided in particular in that the nonwoven fabric has a Teflon impregnation and is provided with metal particles, in particular with metal strips.
  • metal particles respectively Metal strips which are incorporated into the nonwoven fabric, the electrical conductivity can be improved in an advantageous manner.
  • Figure 1 is a schematic sectional view of a
  • FIG. 2 is a detail of the electric motor according to the invention
  • FIG. 3 is a perspective view of a contacting element according to the invention according to FIGS. 1 and 2,
  • FIG. 5 is a perspective view of a contacting element according to the invention according to FIG. 3,
  • FIG. 6 shows a further embodiment of a contacting element according to the invention in a perspective view.
  • FIG. 1 shows a sectional view of an electric motor 10 embodied by way of example as an external rotor motor.
  • the electric motor can be used in particular as a fan motor in HVAC systems or for cooling an internal combustion engine in a vehicle or for driving a fan, a transmission, a pump or an actuator.
  • the electric motor 10 has a fixed part, the stator 12 and a rotating part, the rotor 14.
  • An electric motor 10 of the external rotor motor type as illustrated by way of example in FIG characterized by the fact that the radially inner part is fixed during operation, while the radially outer part rotates.
  • On the stator 12 a plurality of windings 16 is arranged.
  • the rotor 14 in turn has magnets 18. If the windings 16 are traversed by current, the magnetic field of the electric motor 10 is thereby generated.
  • the windings 16 of electric motors are fed in operation usually with pulse width modulated signals that can cause interference.
  • the electromagnetic interference radiation occurs at the windings 16 or the magnet 18.
  • the interference radiation can lead to disruption of other electronic systems and components which are arranged in the vicinity of the electric motor 10.
  • the electric motor 10 can in the reverse manner and interference from the
  • the electric motor 10 should therefore shield windings 16 and magnets 18 as possible in all directions.
  • a shield can be achieved inter alia by a rotor 14 arranged as close as possible to the stator 12.
  • the rotor 14 is formed substantially cup-shaped. This cup-shaped design of the rotor 14 in this case forms a shield for the windings 16 and magnets 18, which are arranged within the cup-shaped rotor 14.
  • the cup-shaped rotor 14 has for this purpose in the radial direction
  • first portion 20 of the rotor 14 forms the bottom of the cup-shaped rotor 14.
  • the rotor 14 has a second portion 22 which is disposed on the outer edge of the rotor 14 and a circumferentially extending, in the axial direction Side wall of the cup-shaped rotor 14 forms.
  • the open area of the rotor 14 opposite the bottom 20 of the cup-shaped rotor 14 is shielded by a motor carrier 24, as can be seen clearly in FIG.
  • the arrangement of the pot-shaped rotor 14 and the motor support 24 acting as a cover results in a substantially closed space, which is shielded in all directions by electrically conductive surfaces.
  • the motor shaft 26 is rotatably connected to the motor carrier 24 and thus associated with the stator 12. Such a rotationally fixed connection can be provided in particular by injecting the motor shaft 26 into the motor carrier 24.
  • the motor shaft 26 has a free end 30 and a rotation axis 32 about which the rotor 14 and the stator 12 are rotatably mounted to each other.
  • the motor shaft 26 has a peripheral circumferential surface 27 extending in the axial direction.
  • the invention is not limited to one shown here Embodiment with a rotationally fixed in the stator 12 arranged motor shaft 26 limited. Rather, it is also conceivable that the motor shaft 26 is rotatably clamped in the rotor 14 and correspondingly the motor shaft 26 is associated with the rotor 14.
  • the axis of rotation 32 extends in the sense of an infinitely extending imaginary straight line in particular centrally through the motor shaft 26 and corresponds to the central axis of the motor shaft 26.
  • the pot-shaped rotor 14 For rotatable mounting of the rotor 14 relative to the stator 12 about the axis of rotation 32 points the pot-shaped rotor 14 on its side facing the motor shaft 26 a bearing seat 36, which in axial
  • a bearing 38 is arranged inside the bearing seat 36 of the rotor 14. As shown in Figure 1, the bearing 38 has two rolling bearings 40, 42, wherein both roller bearings 40, 42 sit with their respective outer ring 44 in the bearing seat 36 of the rotor 14 and with its corresponding inner ring 46 on the motor shaft 26.
  • the rotor 14 In order to prevent the rotor 14 from assuming the function of a high-frequency antenna and possibly worsening the interference problem, the rotor 14 must be contacted with a ground potential 34. For this purpose, the rotor 14 must be electrically conductively connected to the motor shaft 26, which in turn is pressed into the motor carrier 24 and thus abuts the ground potential 34. Such a coupling between the rotor 14 and the motor shaft 26 can not be provided via the rolling bearings 40, 42 as a rule, since they have an oil-filled bearing gap, which has the consequence that no sufficiently stable ohmic connection can be provided.
  • an electrically conductive contacting element 48 is arranged between the stator 12 and the rotor 14.
  • Theêtierelement 48 causes the reduction of potential differences between the rotor 14 and stator 12 of the electric motor 10 and is
  • the nonwoven fabric 52 has fibers in a different orientation, so that they are arranged on a possible contact surface with different angles. In this way, despite a small radial contact force, a large contact surface can be built up.
  • the fixedly clamped end 28 of the motor shaft 26 facing rolling bearing is referred to as the first roller bearing 40 and the free end 30 of the motor shaft 26 associated rolling bearings as the second rolling bearing 42.
  • Rolling 40, 42 are only exemplified as a ball bearing. It is also conceivable that other basic forms of rolling bearings, such as cylindrical roller bearings, needle roller bearings or tapered roller bearings are used. However, all of these rolling bearing shapes have in common that rolling bodies between the inner ring 46 and an outer ring 44 reduce frictional resistance and because of lubrication or their nature they are unable to provide a sufficiently stable ohmic connection between the rotor 14 and the stator 12.
  • a contacting element 48 according to the invention which is formed at least partially from an electrically conductive nonwoven fabric 52 of the type in question, is used in an electric motor 10 which is mounted by means of at least one sliding bearing.
  • the contacting element according to the invention 48 rotatably connected to the at least one sliding bearing and on the lateral surface of the motor shaft and additionally or alternatively also on the end face of the sliding bearing to this movable, in particular rotatably rests.
  • the outer ring 44 of the first bearing 40 is clearly fixed in the axial direction in the embodiment shown here.
  • the outer ring 44 of the first roller bearing 40 is fixed at its free end 30 of the motor shaft 26 facing side via a spacer sleeve 49.
  • the second bearing 42 assumes the function of a fixed bearing, that is, it is capable of unambiguously positioning the motor shaft 26 in the axial direction.
  • the second bearing 42 must be able to absorb both radial and axial forces and guide it into the surrounding construction.
  • the inner ring 46 of the second bearing 42 is fixed for this purpose on its the free end 30 of the motor shaft 26 facing side via a locking ring 50 on the motor shaft 26.
  • an inventive electric motor 10 is not limited to an axial fixation of the inner ring 46 via a locking ring 50. It can also be provided other security elements, such as nuts or lock washers.
  • other security elements such as nuts or lock washers.
  • the contacting element 48 is integrally formed in the embodiment shown in Figure 1 from an electrically conductive nonwoven fabric 52 and rotatably connected to the outer ring 44 of the first rolling bearing 40. According to the one shown in FIG. 1
  • Outer ring 44 of the rolling bearing 40 is so large that a sufficiently stable ohmic connection between the outer ring 44 and the contacting element 48 can be provided.
  • an electrically conductive nonwoven fabric 52 annular disc in its inner region which is referred to as the second section 64, on the inner ring 46th and additionally or alternatively thereto on the lateral surface 27 to this movable, in particular rotatable and thus forms a sliding contact by the formation of the sliding contact of an electrically conductive nonwoven fabric 52, which according to the invention particularly good
  • the nonwoven fabric 52 has an electrical resistance which is less than 75 W.
  • a particularly stable contact can be provided in particular by the contacting element 48 abutting both on the inner ring 46 of the rolling bearing 40 and on the lateral surface 27 in a grinding manner.
  • Contacting element 48 is arranged on the second bearing 42. In such an embodiment, it is conceivable, for example,
  • the speed groove 51 assumes the function of the contact element 48 according to the invention in addition to its support function.
  • the contacting element 48 may be arranged on the end face 60 of the respective roller bearings 40, 42 facing away from the free end 30 of the motor shaft 26.
  • the invention is not limited to one Embodiment with only one contact element 48 limited.
  • a corresponding contacting element 48 to be arranged on both roller bearings 40, 42.
  • FIG. 2 shows a section of the electric motor 10 according to the invention analogous to Figure 1.
  • the motor shaft 26 is rotatably mounted in the stator 12.
  • a bearing seat 36 is formed on the rotor 14.
  • the inner ring 46 of the same bearing 40 is substantially non-rotatably connected to the motor shaft 26.
  • a contacting element 48 is provided, which is in contact with the roller bearing 40 and rests against the lateral surface 27 of the motor shaft 26.
  • Rolling, movable, in particular rotatably applied Furthermore, it can also be provided that such a contact element 49 simultaneously, in particular rotatably, rests on both the lateral surface 27 of the motor shaft 26 and on the end face 60 of the rolling bearing.
  • the end face 60 of the roller bearing 40 represents that surface which is essentially perpendicular to the imaginary axis of rotation 32.
  • the contact element 48 has a rotationally fixed manner to the rolling bearing 40 connected to the first section 62 and as
  • the contacting element 48 shown in the embodiment according to FIG. 2 is produced in one piece from an electrically conductive nonwoven fabric 52.
  • a nonwoven fabric 52 of the type in question here is preferably a material which with respect to its
  • nonwoven fabric 52 preferably has one
  • Such a nonwoven fabric 52 is thus advantageously capable of abrading against the lateral surface 27 of the motor shaft 26 and alternatively or additionally to abut against the end face 60 of the rolling bearing 40 without increased friction losses occur.
  • the contacting element 48 lies rotatably in the sense of a sliding contact both on the end face 60 of the roller bearing 40 and on the lateral surface 27 of the motor shaft 26.
  • the rotatable, axial contacting of the Mixieriatas 48 and the second portion 64 of the Mixieriatas 48 with the end face 60 of the rolling bearing 40 is referred to as the first sliding contact surface 66 and the rotatable, radial
  • FIGS. 1 and 2 having a contacting element 48 resting against both the first sliding contact surface 66 and the second sliding contact surface 68 has the advantage that, in the event of loss of contact with one of the two sliding contact surfaces 66, 68, the potential equalization over the
  • Slip contact surface 66 can often occur during operation by start-up or shaking loads, so that the corresponding radial contact can maintain the function of balancing the potential differences.
  • By such a two-sided contact on both sliding contact surfaces 66 and 68 can thus be advantageously increased the reliability. According to the present invention, it is also conceivable that the contacting element on the first
  • FIG. 3 shows the embodiment of the invention shown in FIG.
  • the contacting element 48 shown in FIG. 3 is formed in one piece from an electrically conductive nonwoven fabric and has a substantially planar annular shape with a first section 62 arranged in the outer region and a second section 64 arranged in the inner region. In the mounted state, the axially extending inner surface with the axial height 70 on the lateral surface 27 of the
  • the contacting element 48 in addition to such an essentially planar embodiment of the contacting element 48, it is also conceivable for the contacting element 48 to have an encircling collar in the region of the second section 64, which protrudes axially beyond the contour of the first section 62, so that the height 70 of the second sliding contact surface 68 and concomitantly the surface of the radial contact with the
  • Such Kunststoffierelement 48 with a circumferential collar has in particular with regard to the optimization of the target functions such as Size of the sliding contact surface and the contact pressure of the
  • Inner diameter 72 of the contacting element 48 is dimensioned so that in the assembled state, the contacting element 48 with a
  • FIG 4 shows a section of an electric motor 10 according to the invention according to Figure 2 with the difference that the inventive
  • Contacting element 48 has a support element 74 and an insert element 76.
  • the insert element 76 is formed from an electrically conductive nonwoven fabric 52.
  • a support element 74 of the type in question may be a metal support element. However, it is also conceivable that the support element 74 is formed of a different material. In this case, it is only essential to the invention that the support element 74 has sufficient bending stiffness and thus a supporting structure for the nonwoven fabric 52
  • Insert element 76 offers. According to a possible embodiment of the invention it is
  • the insert element 76 is first adhesively bonded to the support element 74 on the contact surface 80 that forms between these two components. Subsequently, the insert element 76 is pushed together with the support member 76 so far on the motor shaft 26 that the contact element 48 abuts with its support portion 58 on the outer ring 44 of the first bearing 40. Subsequently, the spacer sleeve 49 is pushed, which presses the first portion 62 of the Mixierettis 48 against the outer ring 44. Essential to the invention here is that the support area 58 is so large that a sufficiently stable ohmic connection between the outer ring 44 and the contact element 48 can be provided. Of course, it is also conceivable that the insert element 76 is merely clamped in the support member 74, so that the additional manufacturing step of the bonding can be omitted. Furthermore, it is also conceivable that such a two-part
  • FIG. 5 shows the embodiment of the invention shown in FIG.
  • Section 64 of the Kunststoffieriatas 48 that is, the portion which rotatably on the end face 60 of the rolling bearing 40, 42 and additionally or alternatively thereto abuts the outer surface 27 of the motor shaft is formed of an electrically conductive nonwoven fabric 52. Due to the
  • the width 78 of the insert 76 is reduced in the radial direction, so that only a small disc of the electrically conductive nonwoven fabric 52 is inserted into the support member 74.
  • Essential to the invention here is only that the support element 74 itself does not abrade against rotating components and here
  • the insert element 76 projects beyond the contour of the support element 74 in the axial direction and, alternatively or additionally, covers the entire width 80 of the support element 74.
  • FIG. 6 shows a further embodiment of a contacting element 48 according to the invention in a perspective illustration.
  • the contacting element 48 has an insertion element 76 and a
  • the electric motor 10 drives the electric motor 10 according to the invention.
  • the electric motor 10 can also be used in a pump, in particular a coolant pump, or an interior ventilation system of a vehicle.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Motor Or Generator Frames (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

L'invention concerne un moteur électrique (10), en particulier un moteur à rotor extérieur, comprenant un rotor (14), un stator (12) et un arbre de moteur (26), l'arbre de moteur (26) étant associé au stator (12) ou au rotor (14) et présentant un axe de rotation (32) autour duquel le rotor (14) et le stator (12) sont montés rotatifs l'un vis-à-vis de l'autre au moyen d'au moins un palier à roulement (40, 42) qui présente au moins une surface terminale (60), l'arbre de moteur (26) présentant une surface externe (27) et un élément d'établissement de contact (48) étant disposé entre le rotor (14) et le stator (12), lequel élément est en contact avec ledit au moins un palier à roulement (40, 42) et est en appui sur la surface externe (27) de l'arbre de moteur (26) et/ou la surface terminale (60) du palier à roulement (40, 42) de manière mobile, en particulier rotative, par rapport à celles-ci. Selon l'invention, l'élément d'établissement de contact (48) est constitué au moins en partie d'un non-tissé (52) électriquement conducteur.
PCT/EP2018/082970 2017-12-08 2018-11-29 Moteur électrique WO2019110410A1 (fr)

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DE102017222281.6A DE102017222281A1 (de) 2017-12-08 2017-12-08 Elektromotor
DE102017222281.6 2017-12-08

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DE202020005555U1 (de) * 2020-08-24 2021-08-25 Robert Bosch Gesellschaft mit beschränkter Haftung Elektrische Maschine mit einer elektrisch leitenden Abschirmplatte
DE102022101754A1 (de) * 2022-01-26 2023-07-27 Schaeffler Technologies AG & Co. KG Elektrische Rotationsmaschine, elektrisches Antriebssystem und Getriebemotoreinheit

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US5821649A (en) * 1995-08-18 1998-10-13 Magnetek, Inc. Electrostatic shielding system for reduction of bearing currents in electric motors
DE19929686A1 (de) * 1999-06-28 2001-01-25 Christian Felber Bürstenring für Elektromotoren
US7071589B2 (en) * 2001-11-06 2006-07-04 Precor Incorporated Method and system for reducing bearing fluting in electromechanical machine
DE102012201545A1 (de) 2011-12-29 2013-07-04 Robert Bosch Gmbh Vorrichtung zum Schirmen von elektromagnetischer Störstrahlung eines Elektromotors
DE102013223673A1 (de) * 2013-11-20 2015-06-03 Zf Friedrichshafen Ag Kraftfahrzeugantriebsstrang

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