WO1997020377A1 - Läufer für einen elektromotor sowie verfahren und formwerkzeug zur herstellung eines derartigen läufers - Google Patents
Läufer für einen elektromotor sowie verfahren und formwerkzeug zur herstellung eines derartigen läufers Download PDFInfo
- Publication number
- WO1997020377A1 WO1997020377A1 PCT/EP1996/005172 EP9605172W WO9720377A1 WO 1997020377 A1 WO1997020377 A1 WO 1997020377A1 EP 9605172 W EP9605172 W EP 9605172W WO 9720377 A1 WO9720377 A1 WO 9720377A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- armature
- anchor
- grooves
- motor shaft
- mold
- 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.)
- Ceased
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/32—Windings characterised by the shape, form or construction of the insulation
- H02K3/34—Windings characterised by the shape, form or construction of the insulation between conductors or between conductor and core, e.g. slot insulation
- H02K3/345—Windings characterised by the shape, form or construction of the insulation between conductors or between conductor and core, e.g. slot insulation between conductor and core, e.g. slot insulation
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/12—Impregnating, moulding insulation, heating or drying of windings, stators, rotors or machines
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/32—Windings characterised by the shape, form or construction of the insulation
-
- 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
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/32—Windings characterised by the shape, form or construction of the insulation
- H02K3/38—Windings characterised by the shape, form or construction of the insulation around winding heads, equalising connectors, or connections thereto
Definitions
- the present invention relates to a rotor for an electric motor with an armature formed from a plurality of armature plates, which armature has a plurality of armature grooves for receiving electrical winding material and is provided with an insulating layer on the end face and in the armature grooves is.
- the invention further relates to a method for • producing such a rotor for an electric motor, in which in the framework of a plastic Spritlzvorganges at opposite end faces of the armature two zu ⁇ each coaxial covering layers are formed, wherein the width is wider from formed between the grooves webs than the width of the webs of the anchor plates.
- the invention also relates to a device for producing a rotor, as stated above, for an electric motor, the device having a first mold half and a second mold half, which can be brought together into a closed position, for defining one for receiving the Anchor provided mold space.
- DE-28 38 405 C3 discloses a method for producing a rotor for an electric motor and a casting mold for carrying out this method.
- the armature slots provided for receiving armature winding material run in a straight line parallel to the longitudinal axis of an armature formed by a number of armature plates and fastened to an armature shaft.
- An insulating layer is formed on the inner surfaces of the anchor grooves and is connected to two cover layers each formed in the end region of the anchor.
- An armature for avoiding eddy currents is usually formed from a number of armature plates, which are placed in rows on one another on a motor shaft. These anchor plates are usually rigidly connected to the motor shaft via an insulating core section. In order to enable the formation of this core section, the individual anchor sheets are provided with a central punching, the inside diameter of which is slightly larger than the outside diameter of the motor shaft. When the anchor plates are placed on the motor shaft, a space is created between the anchor plates and the motor shaft, into which the plastic material provided for forming the core section can be injected in the course of a spraying process.
- rotor constructions with anchor grooves running parallel to the shaft axis In addition to rotor constructions with anchor grooves running parallel to the shaft axis, rotor constructions with spatially curved anchor grooves running obliquely to the shaft axis are known. In many fields of application, rotor designs of this type are distinguished by a longer service life and more favorable electromechanical operating behavior compared to rotor designs with armature grooves running parallel to the shaft axis.
- the invention is therefore based on the object of providing a rotor for an electric motor in which effective insulation of each individual armature plate with respect to the subsequently formed in the armature grooves formed by the armature bringing armature windings is achieved and to provide a method and a mold for producing such a rotor, in which a desired position of each armature plate relative to the motor shaft can be determined in a small tolerance range in one operation.
- this object is achieved according to the invention by the method specified in claim 1.
- a molding tool for the manufacture of a runner with spatially obliquely extending anchor grooves the above-mentioned object is achieved according to the invention by the molding tool specified in claim 11.
- a rotor for an electric motor the above-mentioned object is achieved according to the invention by a rotor according to claim 25.
- the manufacturing method according to the invention advantageously makes it possible in a single operation for an armature with oblique armature grooves to connect the individual sheet-metal layers of the armature to the motor shaft in a rotationally fixed manner and, at the same time, to form two mutually angularly offset insulating cover layers on both end faces of the armature ⁇ which are connected to each other via an insulation layer formed in the same operation in the anchor grooves.
- An embodiment of the method which is advantageous with regard to a gentle demolding of the armature assembled in the context of a single plastic injection process is achieved in that the armature is separated from the groove cores with the introduction of a torque into one end of the motor shaft.
- it is advantageously provided with a flattened portion so that the motor shaft can be rotatably engaged with a corresponding counterpart.
- An embodiment of the method which is particularly advantageous in accordance with a particular aspect of the present invention is given in that the extrusion-coated armature is pulled off or stripped from the groove cores while simultaneously rotating the same.
- this is made possible by a shape in which the individual groove cores are rigidly connected to the corresponding mold half, as a result of which a particularly high positional accuracy of the individual groove cores in relation to one another can be achieved.
- the pulling force required to pull the armature off the groove cores can advantageously be introduced into the armature via the radial outer surface thereof. According to a preferred embodiment of the method according to the invention, however, the force required for stripping the armature from the grooved cores is transmitted to the armature via a plunger attached to an end face of the armature.
- An embodiment of the method which is advantageous with regard to rapid insertion of the individual anchor sheets into the corresponding injection mold is given in that part of the groove cores in a first direction and the remaining part of the groove cores in an opposite direction from the overmolded anchor is pulled out.
- a particularly advantageous embodiment of the method is given according to the invention in that the armature plates are finely positioned in the interior of the injection mold relative to the motor shaft, the exact angular position of the armature plates relative to the motor shaft being determined via at least one stop surface which is provided with a radial gap side wall contact of the armature.
- Such a procedure ensures a high angular position accuracy due to the relatively large distance between the contact area of the armature plates and the stop surface from the motor shaft.
- that radial gap wall does not occur
- the fine positioning of the anchor plates is advantageously carried out by two stop faces diametrically opposite one another with respect to the shaft axis of the motor shaft. This enables a particularly exact positioning of the anchor plates and at the same time a uneven application of material to the anchor, which leads to a low imbalance.
- a device for producing a rotor for an electric motor with a shaft, an armature composed of a number of armature plates with a number of armature grooves is provided.
- the anchor grooves are spatially curved and run obliquely to the longitudinal axis of the anchor.
- the individual lamellae or armature plates are preferably rigidly connected to the motor shaft via a core section which is formed in the course of a plastic injection molding process.
- the device comprises a first mold half and a second mold half, which can be brought together in the closed position, for defining a mold space provided for receiving the motor shaft and the armature.
- This device is characterized according to the invention in that a number of spatially wound groove cores is provided which corresponds to the number of grooves and which is dimensioned such that between the cores and webs the Anchor plates each have an intermediate space provided for filling with a plastic material, which is connected to a first and a second cover layer molding space formed on the end faces of the anchor in the respective mold half.
- At least one of the groove cores is preferably provided with a spatially curved abutment surface which can be brought into contact with a wall section of each armature plate such that each of the armature plates automatically inserts the angular position corresponding to its axial position relative to the motor shaft after insertion into the mold space ⁇ sition occupies.
- An embodiment of the device which is particularly advantageous according to the invention is given in that the spatially wound contact surface section is formed in each case on two mutually adjacent slot cores for positioning the anchor plates relative to the motor shaft. This advantageously makes it possible to ensure extremely precise positioning of the anchor plates.
- the abovementioned contact surface section extends along a separating web projecting radially outward from the respective groove core.
- This separating web advantageously has a groove in its foot region, ie in the transition region between a radial side wall of the web and a cylindrical surface section of the groove core. This enables an inner edge of the gap rich to be provided with a bead portion made of plastic material, thereby advantageously avoiding any damage to the winding wire when it is introduced into the armature slots.
- Such a recess advantageously also reduces the contact area between the individual armature plates and the grooved cores, so that in particular burrs which may be present on the armature plates have no influence on the positional accuracy of the armature plates relative to the motor shaft can take.
- a particularly advantageous embodiment of the device in terms of a particularly reliable removal of the finished armature from the mold is provided in that a rotary ejection device is provided for ejecting the armature from the mold space while the armature is actively rotated.
- a rotary ejection device is provided for ejecting the armature from the mold space while the armature is actively rotated.
- This avoids in a particularly favorable manner that the connecting section between the armature assembly composed of armature plates and the motor shaft is overloaded.
- This advantageously also ensures that the position of the armature plates relative to the motor shaft, which is determined by the spraying process, is not changed as part of the demolding process. Due to the particularly gentle demolding of the rotor that becomes possible as a result, it becomes possible to increase the cycle speed, since complete cooling of the rotor is not absolutely necessary.
- the spatially wound groove cores are connected to a mold half and that this mold half is provided with an ejection cylinder which is arranged coaxially to the mold axis and has a receiving section for receiving a End section of the motor shaft in a centered manner, the ejection cylinder being coupled to a torsion drive, for forcibly rotating the ejection cylinder during ejection.
- the anchor plates can be stacked Wise, for example, used by a handling device in each mold half provided with the grooved cores, the individual anchor plates automatically assuming the required position as part of the insertion.
- the realization of a rotary ejection device proves to be particularly favorable in the case of a device designed in this way.
- the ejection cylinder can be engaged in a rotationally fixed manner with the motor shaft.
- a preferred embodiment of the invention is provided in that a stop rod is provided in the interior of the ejection cylinder for fixing the axial position of the motor shaft in the molding space.
- the position of the stop rod relative to the groove cores is not changed during the demolding process.
- the position of the stop rod can be adjusted, for example, using a fine-thread device or a differential screw.
- a particularly advantageous embodiment of the device is given in that a pressure device is provided for urging the motor shaft against the stop rod. This ensures in a simple manner that the motor shaft is always pressed against the stop rod with a predetermined contact pressure.
- the cylindrical mold space provided for receiving the armature is formed from a number of mold segments, the mold segments being movable in the radial direction relative to the mold axis.
- a number of stop projections are arranged in the first half of the mold associated with the stop rod, such that the positioning of the end of the motor shaft resting against the stop rod is relative to that anchor plate facing this end via the with the The anchor plate comes into contact with the projections and the stop rod comes into contact with the motor shaft.
- a further embodiment of the invention which is advantageous with regard to a particularly high final dimension accuracy of the rotor or armature is given in that the cover layer shaped section provided in the second mold half forms an armature length compensation space for compensating the length of the armature sheet metal stack by means of the layer thickness the top layer.
- a further particularly advantageous embodiment of the device according to the invention is provided in that a number of projections protrude into the molding space to form the length compensation cover layer in order to ensure a minimum layer thickness of the cover layer.
- the projections advantageously have a circular cross section.
- it is also possible to form these projections by means of axially displaceable pins, which can be placed on the armature lamination stack in such a way that it is pressed together under a predetermined compressive force. By recording the feed length of the corresponding tap It becomes possible to determine the total length of the armature sheet stack, which also makes it possible to make an appropriate selection immediately after the runners have been removed from the mold.
- An embodiment of the device which is advantageous with regard to a particularly advantageous plastic injection process is given by the fact that the plastic material is fed into the molding space on the side of the length compensation cover layer. This makes it possible in a particularly advantageous manner to press the individual anchor sheet layers against one another at the beginning of the injection process by means of the pressure of the injected plastic material. In addition, there is a particularly advantageous spreading of the plastic material into the molding space.
- the amount of the plastic material to be injected can also advantageously be determined taking into account the total length of the stack of armature plates, which can be determined, for example, by means of the pins mentioned above.
- a particularly advantageous embodiment of the ejection cylinder is given by the fact that it is provided with a number of projections which penetrate the front cover layer and is in contact with the corresponding end anchor plate via these projections. This makes it possible in a particularly advantageous manner not to transmit the pressure force to be transmitted from the ejection cylinder via the plastic material, but rather to introduce it directly into the stack of armature plates.
- a number of fine positioning projections are provided which are rigidly connected to the first mold half and can also be brought into contact with the corresponding end-side anchor plate.
- those fine positioning projections penetrate the corresponding end cover layer in the region of the shaft sections of the anchor webs.
- the outer geometry of the fine positioning projections is fixed in such a way that they taper towards their contact area on the corresponding anchor plate.
- the fine positioning projections are designed such that their radial side walls extend essentially parallel to the adjacent wall section of the adjacent anchor grooves.
- both groove-core halves are pulled out from the spatially curved anchor groove in corresponding opposite directions.
- the gap area defined between the individual anchor webs is defined according to a further inventive concept enforced by a spatially curved shaped body which is formed separately from the groove cores.
- These corresponding shaped bodies can advantageously be lifted radially outward from the slot cores radially to the longitudinal axis of the rotor and in particular are formed on corresponding segments with hollow cylinder wall sections.
- the above-described embodiment of a device with two-part groove cores in each case is particularly suitable for relatively short anchors or can be used to produce anchors whose anchor grooves are only inclined relatively slightly.
- a short section of a radial projection can be formed in the foot area thereof, in order to form the end section of the gap area between the anchor webs.
- FIG. 1 is a perspective view of a runner for a
- Fig. 2 is a plan view of an anchor plate, as in accordance with an anchor. 1 applies,
- FIG. 3 shows a detail of a longitudinal section through a molding tool according to the invention
- FIG. 4 shows a simplified illustration of a cross section through a cylindrical shaped section of the “ shape according to FIG. 3,
- FIG. 5 is a schematic diagram to illustrate the contact of a slot core with a section of an anchor plate
- Fig. 6 is a schematic diagram for explaining how an anchor plate is positioned in the mold.
- FIG. 7 shows a simplified illustration of a two-part groove core.
- a number of anchor plates 2 are arranged on a motor shaft 3.
- the motor shaft 3 is provided at one end with a flattened portion 4, by means of which a torque can be introduced into the motor shaft 3 when the rotor 1 is removed from a molding tool shown in FIG. 3, for example.
- a cover layer 6, 7 made of plastic material is formed on each of the two end faces of the armature 5.
- the two cover layers 6 and 7 have essentially the same shape as that Anchor plates 2.
- Both cover layers 6 and 7 have a number of shaft sections 8, which are approximately 0.4-0.8 mm larger in width than the corresponding shaft sections of the anchor plates 2.
- the inner wall of the anchor grooves running obliquely to the rotor axis 9 10 consists of a plastic layer which is formed in one piece with the cover layers 6 and 7.
- the cover layers 6 and 7, a layer 11 forming the wall of the anchor groove 10 and a core section (not shown here) for fastening the anchor plates 2 on the motor shaft 3 are produced in the course of a single plastic injection molding process, so that the rotor 1 is removed from the mold as a finished workpiece can.
- the layer 11 is created by filling the intermediate space formed between the groove cores and the armature lamination stack.
- the layer 11 is preferably extremely thin, for example 0.2 mm thick.
- the layer 11 extends spatially wound along the anchor grooves.
- a number of recesses 12 can be seen on the cover layer 6, which is referred to as the front cover layer in the following, which cut through the cover layer 6 completely. Similar recesses are also formed in the top layer 7.
- the recesses 12 are formed by corresponding positioning projections on which the first anchor plate 2 on the end faces after insertion into the molding tool. On the one hand, the positioning projections determine the thickness of the cover layer 6 and the axial position of the armature plate 2 relative to the motor shaft 3.
- the motor shaft 3 has an end face which acts as a stop surface 13 and by means of which the axial position of the motor shaft 3 is fixed in the molding tool.
- the anchor plates 2 are completely surrounded by an insulating plastic material, with the exception of the cylinder outer surface described by you and an area described in more detail below.
- the wall sections defining the gap regions 14 are also covered by an insulating plastic material. This advantageously makes it possible to prevent any damage to the winding wire to be introduced into the armature slots 10.
- An anchor plate 2 used in the rotor according to FIG. 1 is shown in the illustration according to FIG.
- the anchor plate 2 comprises 8 anchor webs 15, each of which has an essentially T-shaped shape.
- the gap area 14 is formed between two anchor webs 15.
- Each of the armature plates 2 is provided with a central punching 16, via which the respective armature plate 2 is placed on the motor shaft shown in FIG.
- a number of driver sections 17 are formed, which serve to better transmit a torque between the armature plate 2 and the motor shaft 3.
- the motor shaft 3 shown in FIG. 1 is roughened or knurled in the area of the armature 5, so that there is particularly good adhesion of a plastic material to the motor shaft 3.
- the punched-out 16 has an inner diameter which is a certain amount larger than the outer diameter of the motor shaft 3.
- the space formed between the armature plate 2 and the motor shaft 3 is filled with a plastic material in the finished assembled rotor.
- the anchor plates shown in FIG. 2 are inserted into a mold (FIG. 3) together with the motor shaft 3 shown in FIG.
- the molding tool shown in FIG. 3 consists of a first mold half 17 and a second mold half 18.
- a number of mold segments 20 which are movable radially to the mold axis 19 are attached to the first mold half 17. The actual shape of these segments 20 can be seen from FIG. 4.
- the first mold half 17 is provided with an ejection device 21 which, in the embodiment shown here, comprises a hollow cylinder pin.
- the ejection device projects with an end portion into the mold space delimited by the first and second mold halves 17 and 18 and the mold segments 20.
- a number of projections are formed at this end, which are responsible for the formation of the cutouts 12 shown in FIG. Via these projections, the ejection device 21 is in direct contact with an anchor plate 2 arranged at the front end of the rotor (not shown in FIG. 3).
- the ejection device 21 engages with the motor shaft 3 in a rotationally fixed manner via the flattened portion 4.
- the runner 5 (not shown here) is ejected via the ejection device 21 by rotating and simultaneously moving it axially.
- a stop rod 23 is arranged in the interior of the hollow cylinder pin of the ejection device 21, by means of which the axial position of the motor shaft 3 in the interior of the molding tool can be adjusted.
- the motor shaft 3 is pushed against the stop rod 23 via a push rod 24 arranged in the second mold half 18.
- a pressure stamp 25 is provided.
- the pressure stamp 25 can advantageously be used to determine the effective length of the laminated core formed by the armature plates 2.
- the molding space 22 there is a number of spatially wound groove cores (not shown here) corresponding to the number of anchor grooves.
- these spatially curved groove cores are rigidly connected to the first mold half 17.
- the mold segments 20 shown in FIG. 4 define the cylindrical wall section of the mold space 22. These mold segments 20 are moved radially to the mold axis 19 by means of a cone mechanism. This makes it possible to move the individual mold segments towards the individual anchor plates with minimal wear.
- FIG. 5 shows a section of a spatially curved slot core 26 and an anchor web 15 assigned to this slot core. These two elements are shown spatially separated from one another only for the purpose of explanation.
- Each of the spatially curved groove cores 26 is dimensioned with respect to its outer geometry in such a way that an intermediate space remains with the adjacent anchor web 15.
- Each of the groove cores 26 is provided on its outwardly facing side surface with a separating web 27 extending in the longitudinal direction of the groove core. The width of this separating web 27 is smaller than the gap width of the gap region identified in FIG. 1 by reference numeral 14. Only in some groove cores 26 is the separating web 27 designed such that it can come into contact with a flank of the armature web 15. This contact area is identified in FIGS.
- the individual armature plates 2 are automatically centered in the mold space 22 relative to the motor shaft 3 via this contact area.
- the separating web 27 is provided with a groove 29, by means of which it is possible to form a bead made of plastic material even on an inward-facing edge of the gap region 14, which ensures effective protection of the respective armature windings.
- the respective anchor plate 2 is positioned by two grooved cores 26.
- the contact area 28 primarily determines the angular position of the armature plate 2 relative to the motor shaft 3.
- the radial position of the armature plate 2 relative to the motor shaft 3 is primarily determined by the shaped segments 20.
- a molding tool arranged in a spraying machine and consisting of a first and a second mold half 17, 18 is brought into an open position, in which the mold space 22 enclosed by the two mold halves is accessible from the outside.
- Inside the first mold half 17 there are eight spatially wound anchor groove cores 26 which are rigidly connected to the first mold half 17.
- a certain number of anchor plates 2 is now inserted into this first mold half 17.
- the individual anchor plates 2 move along the intermediate space remaining between the groove cores.
- a separating web 27 is formed on each groove core 26.
- a contact area 28 is formed on two separating webs 27, which are diametrically opposite one another with respect to the shape axis, and which comes into contact with the individual anchor plates 2.
- the angular position of this plate which corresponds to the respective axial position of the armature plate, is determined via this contact region 28, which runs in a spatially curved manner with the groove core 26.
- a motor shaft 3 is inserted into a receiving section formed in the first mold half 17. It is also possible to insert the individual armature plates 2 together with the motor shaft 3 into the first mold half 17. After insertion into the first mold half 17, the motor shaft 3 is connected in a rotationally fixed manner to an ejection device 21. After insertion of all armature plates 2 and the motor shaft 3, the molding tool is closed by moving the first and second mold halves 17 and 18 together.
- a push rod arranged in the second mold half 18 pushes the motor shaft 3 against a stop rod 23 arranged in the ejection device 21.
- the mold segments 20 come into press contact with the peripheral walls of the individual anchor plates.
- the individual armature plates 2 are thereby positioned relative to the motor shaft 3 with regard to their axial position.
- a pressure ram 25 axially movable in the second mold half 18 is inserted into the molding space 22, so that the individual anchor plates are pressed against one another.
- the entire pack of anchor plates 2 arranged in the molding space 22 is pushed against projections which are arranged on an end face of the ejection device 21 protruding into the molding space 22, or which protrude directly onto the wall section thereof facing the molding space 22 ⁇ most mold half are formed.
- the axial position of the armature plates 2 relative to the motor shaft 3 is fixed via these projections and the stop rod 23 arranged in the ejection device 21.
- the closing force effective between the two mold halves is then increased, as a result of which the contact pressure of the mold segments 20 against the anchor plate packing increases further.
- the first two mold halves 17 and 18 each form two cover layer mold spaces on the two end face regions of the anchor, which are in fluid communication with intermediate spaces which are formed between the spatially wound groove cores 26 and the anchor plates 2.
- the thickness of a cover layer 6 facing the ejection device 21 is set to a constant value via the projections provided in the first mold half.
- the thickness of the cover layer formed by the second mold half 18 depends on the total length of the anchor plate packing.
- An injection channel opens into this second cover layer 7, which is variable in terms of its thickness.
- a heated plastic material is now introduced into the molding space 22 via this injection channel. The heated plastic material first fills the cover layer 7 bounded by the first mold half 18 and then penetrates both through the intermediate grooves remaining between the individual spatially wound groove cores 26 and the anchor plates 2.
- the injection pressure is then increased still further and kept at a predetermined pressure level.
- the first mold half 17 and the second mold half 18 and the mold segments 20 are cooled by a coolant.
- the first mold half 18 is pulled off the motor shaft 3, so that the second cover layer 7 is exposed to the outside.
- the individual shaped segments 20 move radially outwards and thereby lift off from the peripheral wall of the armature.
- the ejection device 21 is now actuated. With simultaneous rotation, this pushes the armature, which is completely overmolded with plastic material, out of the molding space 22.
- the forced coupling of the motor shaft 3 to the ejection device 21 ensures that the position of the motor shaft 3 relative to the armature plates 2 does not change.
- a spatially wound groove core 26 ' is created, which consists of a first core half 26a and a second core half 26b. Both core halves 26a and 26b are in contact with one another via a separating surface k.
- the separating surface k runs between the two base surfaces of the core halves 26a and 26b such that a core thickness of at least 1.5 mm is still present in the tip region of the respective core half.
- the interface k can just be trained. It is also possible to form the separating surface k spatially wound similar to the side wall of the anchor grooves.
- the two-part cores can then be pulled out of the anchor grooves in opposite directions with simultaneous rotation. It is also possible to bring the two-part groove cores into their end position only after injecting a certain amount of plastic material. This makes it possible for there to initially be a larger space between the radial side walls of the anchor grooves and the groove cores during the introduction of the plastic material, which allows the layers to be formed correctly, particularly with thin plastic thicknesses.
- the groove core halves are brought out of their spreading position into their form position.
- This molded position there is an intermediate space provided for filling with a plastic material between the side wall of the anchor grooves defined by the armature lamination stack and the groove cores arranged therein.
- the space filled with plastic material can be reduced before the hardening of the plastic material by appropriate displacement of the groove cores, ie slight displacement of the groove core halves in the spread position.
- This extremely thin layers can be achieved with regard to the insulating layer formed on the radial side surfaces of the anchor grooves.
- the contact sections (28) shown in FIG. 6 can be omitted.
- the separating surface k between the core halves advantageously runs spatially wound similarly to the side surfaces of the anchor grooves.
- the slope or angle between the separating surface k and a reference plane radial to the shape axis is preferably smaller than the slope or angle measured on the same circumferential line between the side surface and the radial reference plane. This enables a particularly simple demolding of the overmolded armature core.
- two radial projections 27 ' can be formed on both core halves, by means of which a respective front end area of the gap area of the armature is at least partially shaped. It is also possible to dispense with the formation of these radial projections 27 'and to carry out the formation of the gap area of the armature exclusively by means of spatially wound projections which are attached to form segments which can be moved in particular radially to the rotor axis and to both of them via a contact surface Core halves can be lowered.
- the course of the parting plane or parting surface k between the two core halves can be determined depending on the length of the anchor grooves in such a way that the tip section of the respective core half is still relatively thick.
- a runner with anchor grooves that run obliquely to the rotor axis represents a body that is ultimately undercut
- the present invention is not limited to the exemplary embodiment explained above.
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Abstract
Description
Claims
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19681008T DE19681008D2 (de) | 1995-11-24 | 1996-11-22 | Läufer für einen Elektromotor sowie Verfahren und Formwerkzeug zur Herstellung eines derartigen Läufers |
| EP96939906A EP0806073A1 (de) | 1995-11-24 | 1996-11-22 | Läufer für einen elektromotor sowie verfahren und formwerkzeug zur herstellung eines derartigen läufers |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19543919.8 | 1995-11-24 | ||
| DE1995143919 DE19543919C1 (de) | 1995-11-24 | 1995-11-24 | Läufer für einen Elektromotor sowie Verfahren und Vorrichtung zur Herstellung eines derartigen Läufers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1997020377A1 true WO1997020377A1 (de) | 1997-06-05 |
Family
ID=7778365
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP1996/005172 Ceased WO1997020377A1 (de) | 1995-11-24 | 1996-11-22 | Läufer für einen elektromotor sowie verfahren und formwerkzeug zur herstellung eines derartigen läufers |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0806073A1 (de) |
| DE (2) | DE19543919C1 (de) |
| WO (1) | WO1997020377A1 (de) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2360395A (en) * | 1999-12-30 | 2001-09-19 | Bosch Gmbh Robert | Electric motor with injection-moulded insulation, particularly for hand machine tools |
| CN101044666B (zh) * | 2004-10-22 | 2011-07-06 | 罗伯特·博世有限公司 | 电机的电枢的包封方法 |
| WO2020043381A1 (de) * | 2018-08-31 | 2020-03-05 | Bayerische Motoren Werke Aktiengesellschaft | WERKZEUG ZUM UMSPRITZEN ODER VERGIEßEN VON ROTOREN |
| CN119974380A (zh) * | 2025-03-04 | 2025-05-13 | 塑科精密制品(赣州)有限公司 | 一种包胶定子塑胶件成型模具 |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19747968A1 (de) * | 1997-10-30 | 1999-05-06 | Abb Patent Gmbh | Verfahren zur Reparatur von Blechpaketen einer elektrischen Maschine |
| US6946758B2 (en) | 2001-01-09 | 2005-09-20 | Black & Decker Inc. | Dynamoelectric machine having encapsulated coil structure with one or more of phase change additives, insert molded features and insulated pinion |
| US7096566B2 (en) | 2001-01-09 | 2006-08-29 | Black & Decker Inc. | Method for making an encapsulated coil structure |
| BR0116740A (pt) | 2001-01-09 | 2003-12-23 | Black & Decker Inc | Motor elétrico tendo induzido revestido com um plástico termicamente condutivo |
| US7814641B2 (en) | 2001-01-09 | 2010-10-19 | Black & Decker Inc. | Method of forming a power tool |
| DE20206616U1 (de) * | 2002-04-26 | 2003-09-04 | Hengst GmbH & Co.KG, 48147 Münster | Gussteil mit schräg verlaufender Nut |
| DE102018219244A1 (de) | 2018-11-12 | 2020-05-14 | Mahle Lnternational Gmbh | Rotoreinheit für eine elektrische Maschine |
| DE102021115530A1 (de) | 2021-06-16 | 2022-12-22 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Abstreifvorrichtung eines Spritzwerkzeugs für eine elektrische Maschine, Spritzwerkzeug für eine elektrische Maschine und Verfahren zur Herstellung einer elektrischen Maschine |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2003587A (en) * | 1932-07-07 | 1935-06-04 | Permold Co | Rotor for electric motors |
| US3254372A (en) * | 1962-06-19 | 1966-06-07 | Bendix Corp | Apparatus for fabricating and insulating lamination assemblies of a stator or rotor unit for use in an electrical device |
| FR2084521A5 (de) * | 1970-03-20 | 1971-12-17 | Schenectady Chemical | |
| DE2838405A1 (de) * | 1977-09-05 | 1979-03-08 | Matsushita Electric Ind Co Ltd | Anker fuer motoren und verfahren zu dessen herstellung |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1488502B2 (de) * | 1965-04-22 | 1973-08-16 | Guienne, Paul Francois, Paris, Gillet, Jacques Lucien, Mareil Marly, Seine et Oise, (Frankreich) | Befestigung und isolierung eines rotierenden koerpers auf seiner welle |
| DE2143542C3 (de) * | 1971-08-31 | 1982-04-15 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Verfahren zur Herstellung eines vollisolierten Ankers für Elektrowerkzeuge |
| DE3613842A1 (de) * | 1986-04-24 | 1987-10-29 | Reinhold Langbein | Verfahren sowie spritzgusswerkzeug zur herstellung eines rotors fuer elektromotoren |
-
1995
- 1995-11-24 DE DE1995143919 patent/DE19543919C1/de not_active Expired - Fee Related
-
1996
- 1996-11-22 EP EP96939906A patent/EP0806073A1/de not_active Withdrawn
- 1996-11-22 DE DE19681008T patent/DE19681008D2/de not_active Expired - Fee Related
- 1996-11-22 WO PCT/EP1996/005172 patent/WO1997020377A1/de not_active Ceased
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2003587A (en) * | 1932-07-07 | 1935-06-04 | Permold Co | Rotor for electric motors |
| US3254372A (en) * | 1962-06-19 | 1966-06-07 | Bendix Corp | Apparatus for fabricating and insulating lamination assemblies of a stator or rotor unit for use in an electrical device |
| FR2084521A5 (de) * | 1970-03-20 | 1971-12-17 | Schenectady Chemical | |
| DE2838405A1 (de) * | 1977-09-05 | 1979-03-08 | Matsushita Electric Ind Co Ltd | Anker fuer motoren und verfahren zu dessen herstellung |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2360395A (en) * | 1999-12-30 | 2001-09-19 | Bosch Gmbh Robert | Electric motor with injection-moulded insulation, particularly for hand machine tools |
| GB2360395B (en) * | 1999-12-30 | 2002-03-20 | Bosch Gmbh Robert | Electric motor in particular for hand machine tools |
| US6509668B2 (en) | 1999-12-30 | 2003-01-21 | Robert Bosch Gmbh | Electric motor, in particular for hand power tools |
| CN101044666B (zh) * | 2004-10-22 | 2011-07-06 | 罗伯特·博世有限公司 | 电机的电枢的包封方法 |
| WO2020043381A1 (de) * | 2018-08-31 | 2020-03-05 | Bayerische Motoren Werke Aktiengesellschaft | WERKZEUG ZUM UMSPRITZEN ODER VERGIEßEN VON ROTOREN |
| CN112384347A (zh) * | 2018-08-31 | 2021-02-19 | 宝马股份公司 | 用于对转子进行注塑包封或浇注的模具 |
| US11813782B2 (en) | 2018-08-31 | 2023-11-14 | Bayerische Motoren Werke Aktiengesellschaft | Device for encapsulating or casting rotors |
| CN119974380A (zh) * | 2025-03-04 | 2025-05-13 | 塑科精密制品(赣州)有限公司 | 一种包胶定子塑胶件成型模具 |
| CN119974380B (zh) * | 2025-03-04 | 2025-10-28 | 塑科精密制品(赣州)有限公司 | 一种包胶定子塑胶件成型模具 |
Also Published As
| Publication number | Publication date |
|---|---|
| DE19681008D2 (de) | 1997-12-11 |
| EP0806073A1 (de) | 1997-11-12 |
| DE19543919C1 (de) | 1997-04-24 |
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