EP3815218A1 - Roue polaire de rotor pour machine electrique tournante - Google Patents
Roue polaire de rotor pour machine electrique tournanteInfo
- Publication number
- EP3815218A1 EP3815218A1 EP19745715.3A EP19745715A EP3815218A1 EP 3815218 A1 EP3815218 A1 EP 3815218A1 EP 19745715 A EP19745715 A EP 19745715A EP 3815218 A1 EP3815218 A1 EP 3815218A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cavity
- fan
- plate
- fixing
- rotor
- Prior art date
- Legal status (The legal status 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 status listed.)
- Withdrawn
Links
- 210000000078 claw Anatomy 0.000 claims description 38
- 238000003780 insertion Methods 0.000 claims description 6
- 230000037431 insertion Effects 0.000 claims description 6
- 230000001419 dependent effect Effects 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 230000002441 reversible effect Effects 0.000 description 6
- 238000003466 welding Methods 0.000 description 4
- 230000000295 complement effect Effects 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 239000007858 starting material Substances 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000005242 forging Methods 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 239000002966 varnish Substances 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000009658 destructive testing Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
- H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
- H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
-
- 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
- H02K1/24—Rotor cores with salient poles ; Variable reluctance rotors
- H02K1/243—Rotor cores with salient poles ; Variable reluctance rotors of the claw-pole type
Definitions
- the invention relates in particular to a polar rotor wheel for a rotary electrical machine, in particular of a motor vehicle.
- a reversible machine is a rotary electrical machine capable of working in a reversible manner, on the one hand, as an electric generator in alternator function and, on the other hand, as an electric motor for example for starting the heat engine of the motor vehicle .
- a rotating electrical machine includes a rotor movable in rotation about an axis and a fixed stator surrounding the rotor.
- alternator mode when the rotor is in rotation, it induces a magnetic field on the stator which transforms it into electric current in order to supply the electric consumers of the vehicle and to recharge the battery.
- motor mode the stator is electrically supplied and induces a magnetic field driving the rotor in rotation.
- the rotor has a shaft extending in a direction defining an axis of rotation of the rotor and two pole wheels mounted on the shaft.
- Each pole wheel has a plate extending transversely to the shaft and a plurality of claws extending axially from the plate.
- Each plate has a first axial end face and a second axial end face from which the claws extend.
- the pole wheels are arranged so that their second axial end faces are opposite one another in an axial direction and so that each claw of one of the pole wheels extends in a space defined between two adjacent claws of the other pole wheel.
- the rotor also includes two fans each mounted on the first axial end face of one of the pole wheels.
- the fans are mounted respectively on the pole wheels by welding and in particular by resistance welding.
- This method of fixing the fans to the rotor requires high electrical power and requires on the one hand to have dedicated electrical transformers and on the other hand to regularly change the electrodes which wear out quickly due to the strong electric currents.
- the tests carried out at the end of assembly on some of the rotors of a production batch to guarantee the correct fixing of the fans in said batch are destructive. The rotors tested are therefore no longer usable.
- any means of attachment cannot be used to attach a fan to a pole wheel. Indeed, the attachment must be strong enough to support the speed of rotation of the rotor and the centrifugal force generated by this rotation and to generate a flow of cooling air driven by the fan without disturbing the magnetic field generated in the wheels. polar.
- the present invention aims to avoid the drawbacks of the prior art.
- the subject of the present invention is a pole wheel for a rotor of a rotating electric machine, the pole wheel comprising a plate extending transversely with respect to an axis of rotation of the pole wheel; and a plurality of claws extending from the tray in a substantially axial direction.
- the plate has at least one cavity intended to receive and cooperate with a fixing element for fixing a fan on the pole wheel.
- the present invention also relates to a rotor of a rotating electric machine, the rotor comprising: a pole wheel comprising: a plate extending transversely with respect to an axis of rotation of the pole wheel and a plurality of claws s' extending from the plate in a substantially axial direction, a fan comprising a plate extending transversely with respect to the axis and at least one blade projecting from the plate.
- the fan is mounted on the pole wheel by at least one fixing element cooperating with a cavity formed in the plate.
- the present invention makes it possible to propose a means of fixing the fan to the pole wheel which is simple, inexpensive, does not require high electrical power, does not require destructive testing, allows good resistance to centrifugal force and does not disturb the magnetic flux of the rotor.
- the cavity is located on a first axial end face of the plate opposite to a second axial end face of the plate from which extend the claws.
- the pole wheel has several cavities. This improves the retention of the fan on the pole wheel and adapts it to different configurations of the pole wheel.
- the pole wheel has as many cavities as claws.
- the plate is divided into several delimited angular sectors, each by two straight lines passing respectively through the center of the plate and the two circumferential ends of the same claw or the two circumferential ends facing two adjacent claws, the sectors forming an alternation, in a circumferential direction, of angular sector with claw and of angular sector without claw.
- the cavity is arranged in an angular sector devoid of claw. This makes it possible not to reduce the passage section of the magnetic flux towards the claw and thus to avoid saturation of the magnetic flux which can lead to a decrease in performance.
- the cavities are located on the same circumference. This makes it easier to manufacture the pole wheel by simplifying the tool making the cavities. This also allows better balancing of the pole wheel.
- the cavities are angularly spaced from one another at the same angle. This also improves the balancing of the pole wheel and simplifies its manufacture.
- the cavity is located between an outer periphery and an inner periphery of the tray.
- the inner periphery of the plate is defined by an opening intended to receive a rotor shaft.
- the outer periphery of the plate is defined by the circumference of larger diameter of said plate, this circumference is here discontinuous.
- the cavity is located closer to the outer periphery of the pole wheel than to the inner periphery. This makes it possible to enlarge the diameter of the cavity and thus to improve the mechanical strength of the fan on the pole wheel.
- the cavity is located in the part of the pole wheel having the smallest thickness in an axial direction.
- the cavity is located in a portion of the plate disposed radially between a portion of the plate being in contact with a core and a portion of the plate being in contact with one of the claws of the pole wheel.
- the cavity has a cylindrical shape.
- This shape allows a cavity to be produced in a simple manner.
- the cavity can have any other type of shape such as a rectangular shape.
- This rectangular shape may include, in addition to a holding function, an anti-rotation function of the fan on the pole wheel.
- the same cavity can have different shapes such as a cylindrical shape in its bottom part and a rectangular shape in its inlet part.
- the cavity has a depth in an axial direction of between 5% to 100% of the thickness of the plate taken at the level of said cavity and preferably between 30% and 60% of said thickness. When this depth is equal to 100% of the thickness of the plate, the cavity is through, that is to say that it extends over an entire axial thickness of the plate so as to lead to the two end faces. axial of said plate.
- the cavity has a maximum diameter between 0.02 and 0.2 times the external diameter of the pole wheel and preferably between 0.03 and 0.08.
- the cavity extends along an axis which is parallel to the axis of rotation of the pole wheel.
- the cavity is formed by a bottom and a side wall.
- the side wall has a first axial end defining an entrance opening of the cavity and a second axial end opposite to said first end which connects the side wall with the bottom.
- the side wall of the cavity extends in a direction which forms an angle between 0 and 30 degrees with the axis of the cavity.
- the cavity has a bottom diameter and an inlet diameter, the bottom diameter being smaller than the inlet diameter. This simplifies the manufacturing process of the cavity.
- the bottom diameter can be greater than the inlet diameter.
- the side wall extends linearly, that is to say that a section in an axial plane of the wall has a straight shape.
- the section can have a concave or convex curve shape.
- the polar wheel comprises a core extending axially from the second axial end face of the plate and centrally around the central opening, the core also having an opening allowing the passage of a rotor shaft .
- the fixing element is force fitted or snapped into the cavity.
- These fixing methods are simple to carry out and less expensive and in particular simpler than a fixing method by welding or by molding the fan on the pole wheel. In addition, these fixing methods are more reliable than screwing.
- the fixing element is attached to the fan. This simplifies the manufacture of the fan by shifting part of the fixing function to have less constraint in particular on the shape of the fan which ensures the fixing of the fan on the pole wheel.
- the fastener is a pin.
- the fastener is made of a metallic material.
- the fixing element extends from the fan plate, that is to say that the fan and the fixing element are in one piece.
- the fan has a fixing portion projecting from the plate in the cavity and cooperating with the fixing element and the cavity to fix said fan. This allows the forces to be distributed to prevent only the fixing element participating in the maintenance of the fan.
- the fixing portion is arranged between the fixing element and a wall of the cavity.
- the fixing portion is arranged to deform under the action of the fixing element to pass from a position before fixing to a fixing position in which said portion cooperates with the cavity to hold the fan. This simplifies the assembly process by making it easier to insert the fixing portion into the cavity in the position before fixing while allowing good mechanical strength following the deformation of the fan on the pole wheel.
- the cavity has a shoulder forming an axial stop against which a portion of the fixing element located in the cavity is supported to maintain the fan on the pole wheel.
- the cavity has a shoulder forming an axial abutment against which the fan fixing portion is pressed to hold the fan on the pole wheel.
- the shoulder extends transversely, relative to the axis of the cavity, from the side wall.
- the shoulder extends over the entire circumference of the side wall or alternatively over only a portion of said circumference.
- the side wall may have several shoulders.
- the shoulder defines an opening whose diameter is less than the largest diameter of the side wall.
- the shoulder extends over a height, in an axial direction, of at least 30% of the depth of the cavity.
- the shoulder extends over a length, in a radial direction relative to the axis of the cavity, of between 10% and 30% of the maximum diameter of the cavity, the maximum diameter being comprised axially between the bottom and shoulder of the cavity.
- the length of the shoulder should not be too small to ensure good support for the fan and should not be too large so as not to overstress the fastener when it is inserted into the cavity.
- the shoulder extends away from the first axial end face of the plate. This allows the fixing forces to be distributed.
- the radial fixing forces are supported by the upper part of the cavity, that is to say the part extending between the shoulder and the inlet opening of the cavity, and the fixing forces.
- axial are supported by the lower part of the cavity, that is to say the part extending between the shoulder and the bottom of the cavity.
- the shoulder extends from the first axial end face of the plate.
- the fan fixing portion comprises a fixing groove cooperating with the shoulder to fix the fan on the pole wheel.
- the shape of the fixing groove is complementary to the shape of the shoulder.
- the fan plate has an opening arranged opposite the associated cavity to allow the insertion of the fixing element.
- the fan has a through groove in an axial direction and extending from the opening. This groove facilitates the passage of the varnish and also reduces the mechanical stresses acting on the fan, in particular during the insertion of the fixing element through the opening.
- the fan plate includes a notch extending in an axial direction and surrounding the opening to partially accommodate the fastener. This is to prevent the fastening element from protruding axially from the fan plate and thus to reduce ventilation noise.
- the fan has a projection extending into the cavity.
- the projection extends into the upper part of the cavity when the latter has a shoulder. This makes it possible to block the fan in rotation relative to the cavity.
- the present invention also relates to a rotary electrical machine comprising a rotor as defined above.
- the rotating electric machine can advantageously form an alternator, an alternator-starter, a reversible machine or an electric motor.
- FIG. 1 represents, schematically and partially, a sectional view, in a plane not including a cavity, of a rotary electric machine according to a first example of implementation of the invention
- FIG. 2 schematically represents a perspective view of a pole wheel of FIG. 1,
- FIG. 3 schematically represents a sectional view of the pole wheel of FIG. 2,
- FIG. 6 represents a zoom of the cavity of FIG. 3,
- FIG. 5 schematically represents a sectional view of a second example of a polar wheel
- FIG. 6 schematically represents a sectional view of a third example of a polar wheel
- FIGS. 7a and 7b represent zooms of the cavity in FIG. 6 according to two alternative embodiments
- FIG. 8 schematically represents a sectional view of the pole wheel of FIG. 2 on which a fan is fixed
- Figures 9a and 9b show zooms of the fixing of Figure 8 according to two alternative embodiments.
- FIGS. 10a and 10b schematically represent a sectional view of the pole wheel of FIG. 2 on which a fan is fixed according to another embodiment
- FIG. 1 schematically shows a top view of an example of a fan
- Figure 12 shows a zoom of part of Figure 1 1.
- FIG. 1 shows an example of a compact and multi-phase rotary electrical machine 10, in particular for a motor vehicle.
- This machine 10 transforms mechanical energy into electrical energy, in alternator mode, and can operate in motor mode to transform electrical energy into mechanical energy.
- This rotary electric machine 10 is, for example, an alternator, an alternator-starter, a reversible machine or an electric motor.
- the machine 10 comprises a casing 11 and, inside thereof, a shaft 13, a rotor 12 integral in rotation with the shaft 13 and a stator 15 surrounding the rotor 12.
- the rotational movement of the rotor 12 takes place around an axis X corresponding to the axis of extension of the shaft.
- the axial, radial, exterior and interior designations refer to the X axis passing through the shaft 13 at its center.
- the exterior or interior designations are assessed relative to the same axis X, the internal designation corresponding to an element oriented towards the axis, or closer to the axis with respect to a second element, the external designation designating a distance from the axis.
- the housing 1 1 includes a front flange 16 and a rear flange 17 which are assembled together. These flanges 16, 17 are hollow in shape and each carry a bearing centrally coupled to a respective ball bearing 18, 19 for the rotational mounting of the shaft 13.
- the housing 1 1 includes fixing means 14 for mounting the rotary electric machine 10 in the vehicle.
- a pulley 20 is fixed on a front end of the shaft 13, at the front flange 16.
- the front / rear designations refer to the pulley 20.
- a front face is a face oriented in direction of the pulley while a rear face is a face facing the opposite direction of the pulley
- the rear end of the shaft 13 carries, here, slip rings 21 belonging to a collector 22.
- Brushes 23 belonging to a brush holder 24 are arranged so as to rub on the slip rings 21.
- the brush holder 24 is connected to a voltage regulator (not shown).
- the stator 15 comprises a body 27 in the form of a pack of sheets provided with notches and an electric coil 28 which passes through the notches of the body 27 and form a front bun 29 and a rear bun 30 on the one hand. on the other side of the stator body.
- the winding 28 is formed of one or more phases electrically connected to an electronic assembly 36 forming a voltage rectifier bridge.
- the rotor 12 is a claw rotor. It comprises two pole wheels 31, each being formed by a plate 32 and a plurality of claws 33 extending from the plate and forming magnetic poles.
- the plate 32 is of transverse orientation and has, for example, a substantially annular shape.
- the plate 32 has a first axial end face 37 and a second axial end face 38 opposite to said first face, the claws extending from the second face 38.
- This rotor 12 further comprises a cylindrical core 34 which is axially interposed between the pole wheels 31.
- this core 34 is formed by two half cores each belonging to one of the pole wheels.
- the rotor 12 comprises, between the core 34 and the claws 33, a coil 35 comprising, here, a winding hub and an electric winding on this hub.
- the slip rings 21 belonging to the collector 22 are connected by wire connections to said coil 35.
- the rotor 12 can also include magnetic elements interposed between two adjacent claws 33.
- the flanges 16, 17 may have openings for the passage of a flow of cooling air from the rotary electrical machine.
- the air flow is generated by the rotation of a front fan 25 fixed on the front axial face of the rotor 12 and a rear fan 26 fixed on the rear axial face of the rotor.
- the plate 32 has cavities 39 extending from the first axial end face 37 to allow the fixing of the fan on the pole wheel.
- the pole wheel 31 comprises in particular between two and eight cavities. In the example illustrated here, the pole wheel has as many cavities as there are claws 33.
- the cavities 39 are located on the same circumference of the plate 32, that is to say that a circle traced on the first axial end face 37 and having as its center the axis X crosses at least one portion of each cavity.
- the respective distances between the axis X and the centers of the cavities 39 are equal for the same pole wheel 31.
- the cavities 39 are angularly spaced from one another at the same angle. A symmetrical polar wheel is then obtained.
- the cavities 39 are located closer to the outer periphery A of the pole wheel 31, defined by the circumference of larger diameter of the plate 32, than to the inner periphery B, defined by the opening traversed by the tree 13.
- the plate 32 is divided into several angular sectors each delimited by two straight lines and forming an alternation of angular sectors with claw Z1 and of angular sectors devoid of claw Z2.
- An angular sector with claw Z1 is delimited by a first straight line passing through the center C of the plate and by one of the two circumferential ends of a claw and by a second straight line passing through the center C and by the other circumferential end of the same claw.
- An angular sector without claw Z2 is delimited by a first straight line passing through the center C and by a circumferential end of a claw and by a second straight line passing through the center C and through the circumferential end of the adjacent claw, the two circumferential ends being opposite one another.
- the cavities are preferably arranged in the angular sectors devoid of claw Z2 in order to disturb as little as possible the magnetic field passing through the plate.
- the rear pole wheel may comprise cavities 39 arranged astride two angular sectors or in angular sectors with claw Z1 to allow the passage of the supply wires from the coil 35 to the collector 22.
- the cavities 39 are arranged in the part of the plate 32 which is neither in contact with the core 34 nor with one of the claws 33, that is to say in the part of the pole wheel having the smallest axial thickness.
- Each cavity 39 extends along an axis Y which is parallel to the axis X of rotation of the pole wheel 31 and has a cylindrical or conical shape.
- Each cavity 39 has a depth P1 in an axial direction between 5% to 100% of the thickness E1 of the plate 32 taken at the level of said cavity and preferably between 30% and 60%.
- the cavity has a depth P1 of between 3 and 20 mm.
- Each cavity 39 has a maximum diameter between 0.02 and 0.2, and in particular between 0.03 and 0.08, times the external diameter of the pole wheel.
- a cavity 39 is formed by a bottom 40 and a side wall 41 having a first axial end defining an inlet opening 42 of the cavity and a second axial end opposite to said first end which connects the side wall with the bottom.
- Leave radii can be provided between for the side wall 41 and the bottom 40 and between the side wall and the first axial end face 37 of the plate.
- the side wall 41 extends linearly, that is to say that a section in an axial plane of the wall has a straight shape.
- the side wall 41 extends in a direction which forms an angle between 0 and 30 degrees with the axis Y of the cavity.
- the cavity 39 has an inlet diameter taken at the inlet opening 42 and a bottom diameter taken at the bottom 40, the bottom diameter being smaller than the inlet diameter.
- the cavities 39 pass through so as to lead both to the first axial end face 37 and to the second axial end face 38 of the plate 32.
- Figures 7a and 7b illustrate an example of a second embodiment in which the cavities 39 have a shoulder 43 extending from the side wall 41 to form a stop.
- the shoulder 43 extends substantially transversely, relative to the axis Y of the cavity 39, over the entire circumference of the side wall.
- the shoulder defines an opening 44 whose diameter is less than the largest diameter of the side wall 41.
- the shoulder 43 extends over a height H1, in an axial direction relative to the axis Y, of at least 30% of the depth P1 of the cavity 39. Still for example, the shoulder 43 extends over a length L1, in a radial direction relative to the axis Y, between 10% and 30% of the maximum diameter of the cavity taken axially between the bottom 40 and the shoulder 43.
- the shoulder 43 extends from the first axial end face 37 of the plate 32.
- the opening 44 formed by the shoulder then corresponds to the entry opening 42 of the cavity 39.
- the shoulder 43 extends at a distance from the first axial end face 37 of the plate 32. In other words, there is a non-zero axial distance between the first connecting portion 37 and the shoulder 43.
- the opening 44 formed by the shoulder is then distinct from the inlet opening 42 of the cavity 39.
- an axial height H2 between the shoulder 43, in particular the apex 57 of said shoulder, and the first axial end face 37 of the plate is at least 15% of the depth P1 of the cavity.
- the apex 57 of the shoulder is the point from which the shoulder has the smallest diameter D3.
- the axial height H2 is at least 2 mm and the depth P1 of the cavity is 6 mm.
- the cavity 39 has an upper part 45 located axially between the first axial end face 37 and the shoulder 43 and a lower part 46 located axially between the shoulder 43 and the bottom 40 of the cavity.
- the parts 45, 46 are independent of each other and may have characteristics such as a shape, dimensions or an angle of inclination relative to the axis Y of the cavity, different.
- a maximum diameter of the upper part 45 is greater than a maximum diameter of the lower part 46.
- the upper part 45 may have a shape different from the lower part 46.
- the lower part 46 may have a cylindrical shape and the upper part 45 may have a rectangular shape. This rectangular shape allows the fan to block in rotation relative to the pole wheel.
- the shoulder has a first portion 47 and a second portion 48, said portions being separated from each other by the apex 57 of the shoulder defining the opening 44.
- the first portion 47 extends opposite the upper part 45 and the second portion 48 extends opposite the lower part 46.
- the first portion 47 extends substantially radially relative to the axis Y and the second portion 48 forms a curvature.
- the cavity 39 can be obtained by a forging process, in particular by hot stamping, or by machining.
- FIGs 8, 9a and 9b illustrate the attachment of a fan 25, 26 to a pole wheel 31.
- the fan 25, 26 comprises a plate 49 extending transversely and at least one blade 50 extending projecting from the plaque.
- the fan is mounted on the pole wheel 31 associated by at least one fixing element 51 cooperating with an associated cavity 39.
- the plate 49 is in contact with the first axial end face 37 of the associated pole wheel 31.
- the plate 49 has an opening 54 arranged opposite the associated cavity 39 to allow the passage of the fixing element 51.
- the opening 54 of the fan is slightly larger than the inlet opening 42 of the cavity so as not to deform the fan during the insertion of the fixing element 51.
- the fixing element 51 may have a head 52 in contact with the plate 49 of the fan and a body 53 extending projecting from the head 52. The body 53 is disposed through the opening 54 of the fan and cooperates with the cavity 39 to hold the fan on the pole wheel.
- FIG. 8 represents a pole wheel according to the first embodiment of FIGS. 3 and 4.
- the fixing element 51 is force fitted into the cavity 39.
- the fixing element 51 could be screwed into the cavity 39.
- the side wall 41 of the cavity could then include a complementary tapping of a threaded part formed on the body 53 of the fixing element 51.
- Figure 9a shows a pole wheel according to the second embodiment of Figure 7a.
- the fixing element 51 is snapped into the cavity 39.
- the shoulder 43 forms an axial abutment against which the fixing element 51 comes to bear to hold the fan.
- the plate 49 comprises a notch 55 surrounding the opening 54 to accommodate the head 52 of the fixing element. This notch is also applicable to the first embodiment illustrated in FIG. 8.
- Figure 9b shows a pole wheel according to the second embodiment of Figure 7b.
- the fixing element 51 is snapped into the cavity 39.
- the plate 49 of the fan 25, 26 has a projection 56 extending in the upper part 45 of the cavity 39 making it possible to block the fan 25, 26 in rotation relative to the pole wheel 31 This projection is also applicable to the first embodiment illustrated in FIG. 8.
- the embodiment of the pole wheel in FIG. 5 is compatible with one or other of the fixing methods described above.
- the fan 25, 26 comprises a fixing portion 58 projecting from the plate 49 in a direction axial opposite to the direction of extension of the fan blades 50.
- the fixing portion 58 extends axially in the cavity 39.
- the fixing portion 58 has a substantially cylindrical shape and the opening 54 extends into the fixing portion to allow the insertion of the fixing element 51 through said portion.
- the fixing portion surrounds the fixing element 51.
- the fixing portion 58 may include a fixing groove 59 whose shape is complementary to the shape of the shoulder 43 to cooperate with said shoulder in order to keep the fan in the pole wheel 31 under the action of the fixing element 51, this action of the fastening element being effected by mechanical stress of the fastening portion 58 in a transverse direction towards the outside, that is to say towards the wall 41 of the cavity.
- the fixing portion 58 has a first position before fixing, illustrated in FIG. 10a in which the fixing element 51 is not inserted into the opening 54 or is inserted only over a small portion which does not allow the deformation of said fixing portion. In this position, the fixing portion 58 extends in an axial direction and does not cooperate with the cavity 39.
- the fixing portion 58 has a second fixing position, illustrated in FIG. 10b, in which the fixing element 51 is inserted through the opening 54 exerting mechanical stress on said fixing portion to ensure mechanical cooperation between the fixing portion 58 and the cavity 39 and in particular between the fixing groove 59 and the shoulder 43 to allow the fixing of the fan on the pole wheel.
- the fixing portion 58 therefore passes from a position before fixing to a fixing position by deformation under the stress of the fixing element 51. In this position, the fixing portion extends in a direction inclined with respect to a axial direction.
- the opening 54 is extended by two grooves 60 extending transversely in the plate 49 and forming a through opening.
- the two grooves 60 extend for example diametrically opposite one with respect to the other around the opening 54.
- an adhesive such as resin or a varnish can be placed in the cavity 39 so improve the retention of said fan on the pole wheel, said groove 60 facilitating this insertion.
- the fixing element 51 is an element relative to the fan 25, 26.
- the fixing element 51 is for example a pin, nail, rivet, screw or even a clip cooperating with the shoulder 43.
- the fastening element 51 extends from the plate 49 of the fan 25, 26.
- the fan and the fixing element are monoblocks.
- the fan 25, 26 is formed from a plastic material.
- the fan 25, 26 is formed from a metallic material such as steel or aluminum or copper or brass or else from a composite material.
- the fastening element 51 is made of metallic or plastic material.
- said element can be made from one piece with the fan or molded onto the fan.
- the present invention finds applications in particular in the field of rotors for alternator or reversible machine but it could also be applied to any type of rotary machine.
- a pole wheel can have identical cavities with each other in order to simplify the manufacture of the pole wheel as well as its balancing.
- the pole wheels of a rotor may have identical cavities as well as an identical distribution of said cavities. It will however be understood that each cavity, of the same polar wheel or of a different polar wheel of the same rotor, can have its own shape, its own dimensions and its own location as long as the associated fixing element is adapted accordingly for keep the fan on the pole wheel.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Cooling System (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Synchronous Machinery (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1855796A FR3083389B1 (fr) | 2018-06-27 | 2018-06-27 | Roue polaire de rotor pour machine electrique tournante |
PCT/FR2019/051566 WO2020002828A1 (fr) | 2018-06-27 | 2019-06-26 | Roue polaire de rotor pour machine electrique tournante |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3815218A1 true EP3815218A1 (fr) | 2021-05-05 |
Family
ID=63722554
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19745715.3A Withdrawn EP3815218A1 (fr) | 2018-06-27 | 2019-06-26 | Roue polaire de rotor pour machine electrique tournante |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3815218A1 (fr) |
FR (1) | FR3083389B1 (fr) |
WO (1) | WO2020002828A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3132810A1 (fr) * | 2022-02-14 | 2023-08-18 | Valeo Equipements Electriques Moteur | Rotor pour une machine électrique tournante |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2946604B2 (ja) * | 1990-02-26 | 1999-09-06 | 株式会社デンソー | 交流発電機 |
US5329199A (en) * | 1992-11-23 | 1994-07-12 | Ford Motor Company | Rotor assembly with molded fans and method for making the same |
US5793143A (en) * | 1997-08-05 | 1998-08-11 | Ford Motor Company | Rotor for an electrical machine |
US7365471B2 (en) * | 2005-03-04 | 2008-04-29 | Remy Inc. | Internal cooling fan with a non-repeating blade configuration |
DE102005027855A1 (de) * | 2005-06-16 | 2007-01-25 | Robert Bosch Gmbh | Polrad einer elektrischen Maschine und elektrische Maschine |
US20170288504A1 (en) * | 2016-04-01 | 2017-10-05 | Prestolite Electric, Inc. | Systems and methods for cooling electronics and a rear end of stator windings in an alternator |
-
2018
- 2018-06-27 FR FR1855796A patent/FR3083389B1/fr active Active
-
2019
- 2019-06-26 EP EP19745715.3A patent/EP3815218A1/fr not_active Withdrawn
- 2019-06-26 WO PCT/FR2019/051566 patent/WO2020002828A1/fr unknown
Also Published As
Publication number | Publication date |
---|---|
WO2020002828A1 (fr) | 2020-01-02 |
FR3083389A1 (fr) | 2020-01-03 |
FR3083389B1 (fr) | 2022-01-21 |
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