DE102008003784A1 - Stator casting method for electric motor, involves shifting stator in rotation about its longitudinal axis during and/or after insertion of pourable casting compound such that compound is distributed in even and hollow space filling manner - Google Patents

Abstract

The method involves shifting a stator (1) in rotation about its longitudinal axis during and/or after the insertion of a pourable casting compound such that the casting compound is distributed in an even and hollow space filling manner during a rotation casting process. The stator is rotated with a minimum rotational speed, where the stator rotates with a rotational speed, which is larger 50 percentages than the minimum rotational speed. The casting compound is injected outwardly and radially from inside during the rotation process. An independent claim is also included for a device for casting stators for electric motors with rotors.

Description

The The invention relates to a method and a device for full encapsulation of Stators of electric motors with internal rotors according to claims 1 and 5.

For it is known the full volume of stators, the bore volume with a suitable stamp or molding to displace. The filling of the potting compound can either after the introduction the stamp or the molding or before the Introduce, in which case preferably by the subsequent Inserting the stamp the potting compound from bottom to top through the grooves and pressed through the winding therein and the potting material volume used is so dimensioned, that after the introduction of the stamp the desired level the potting material is achieved. To stamp after casting To be able to remove again, the stamp must either a have very hard and smooth surface and with release agent be treated, or the stamp is made of a slightly elastic Material having preferably anti-stick properties, for example from a special Teflon variant. When using the latter Variant, the punch is hollow inside, and will after insertion slightly expanded in the stator mechanically or by internal pressure, so that it rests against the stator bore. After curing the potting compound, the stamp is relaxed again, so that the Raises the stamp again from the wall of the stator bore and can be removed from the mold. In addition, the use of stamps or other moldings, especially in larger Engines difficult because of the manufacture and handling of the moldings becomes more complex. In particular, the mentioned Teflon Stamps are extremely expensive in this case.

By the use of a potting compound instead of a conventional one Impregnation or trickling process becomes higher Thermal conductivity of the cast stator packet reached. Through a complete filling of Cavities within the winding and between winding and stator or between winding and housing of the stator can be the heat transfer resistance be significantly reduced between winding and motor housing. This is particularly advantageous when the heat from Housing is efficiently dissipated during operation, z. B. by a forced air or water cooling, because then at the same maximum temperature in the stator a higher Power loss can be dissipated. This allows the Motor can be made more compact or he can at the same outer Dimensions give a higher mechanical performance.

at many engine versions have the highest temperatures in the windings, because these are the worst thermally are connected to the motor housing. Therefore, it is in a full Verguss desirable, especially the winding heads well thermally to tie. From the prior art is known, the motor housing in one piece with an A-end shield to perform after Potting of the stator, which takes place directly in the housing, the front of the housing for heat dissipation to use the winding head. But only one of the two winding heads will be doing this (the A-winding head) thermally better connected. As a consequence, that the power density of the engine still does not increase can be because in the other, thermally ill-connected Winding head (B winding head) is still the limiting highest Temperature is reached. The placement of an annular Metal disc on the B side with thermal connection to the housing, embedded in potting solves the problem unsatisfactory, since under the disc when potting Collect significant amounts of air bubbles. Also does it the finite dosing accuracy and the slightly fluctuating volume the wound stator difficult, the B-side annular Completely pour in metal disc. Therefore the disc is not suitable, the stator housing axially complete plan.

The prior art document discloses methods and devices in which resin is applied to the stator winding by means of an injection molding process. That's how it describes DE 26 06 401 A1 a stator, in which the terminal block is formed of pressed resin. For this purpose, an under pressure and heat running injection molding process and possibly a printing forme is used. The DE 696 01 623 T2 relates to a stator insulation method in which the stator is fully encapsulated and created by exciting creation of a through hole space for the runner. The DE 10 2005 058 219 A1 describes a generic method in which at least one large-area heat-conducting body is embedded in the potting compound. However, it does not address the nature of the introduction of the potting compound. Finally, leave the WO 2004/008603 A2 a method for insulating wrapping an armature winding by means of a thermally conductive plastic material forth. The plastic material is applied to the outer regions of the armature winding by means of an injection molding process.

Another group of patents relates to methods and devices for the isolation of electric motors, in which both insulating paper and a potting compound is used. That's how it describes DE 10 2004 034 428 A1 an electric motor, in which in the winding of Sta gate for producing an electrical insulation in a first area paper and in a second area a potting compound is provided. However, no further details are given about the casting process of the winding. From the JP 59 123 450 A goes out a stator in which the stator winding is laid out on insulating paper on the sheet of the stator housing and shed by means of a resin. Again, there is no information about the nature of Harzvergussvorgangs. Ultimately, the concerns WO 2005/027306 A2 a method of manufacturing a motor in which the field winding is embedded in insulating material such as thermoplastic or silicone rubber. For this purpose, the Statornuten in which the stator windings are inserted, lined with paper, inserted the winding and finally potted with the insulation material. The casting takes place by means of an injection molding process, by spraying, or compression molding.

A last-mentioned group of documents describes methods and devices in which motor windings are isolated by means of laking. The extremely broadly formulated claim 1 of DE 19 24 729 A teaches that the electrically and magnetically active parts of the motor are to be separated directly from the rest of the housing by insulating layers inside the housing of the motor. For this purpose, the insulating layers may consist of a potting, pressing or injection molding compound or be an impregnating resin layer. However, that leaves DE 19 24 729 A open, as this insulating layer is applied, for example, on the inner circumference of the stator winding. Finally, the beats DD 97 782 an insulation of the stator winding by means of a paint or molding compound, in which the insulation ensures the rigid connection of stator winding and stator teeth. This speaks the DD 97 782 only by applying the insulation, without specifying the application of the paint or molding compound. In one aspect of the DD 97 782 the use of a cylindrical sleeve or a mandrel is proposed, which supports the stator teeth during insertion of the stator winding and the application of the paint or molding compound and is then removed again.

outgoing from this prior art, it is an object of the present invention a method and apparatus for full-potting stators to propose for electric motors with internal rotors, which overcomes the above-mentioned problems of the prior art.

These The object is achieved by a device according to claim 1 and solved by a method according to claim 10. Advantageous embodiments of the invention are the subject of the dependent claims.

According to the invention a method for casting stators for electric motors proposed with internal runners, in which the stator to its longitudinal axis during and / or after insertion of flowable potting compound so set in rotation is that the potting compound during the Rotationsgussvorgangs cavity filling and evenly distributed becomes. In this case, the longitudinal axis of the stator is usually aligned horizontally.

Of Furthermore, the potting compound usually before the start of the rotation process introduced into the stator. Through the rotation, the urges flowable potting compound due to centrifugal force into the stator winding and the cavities of the stator, and forms a rotationally symmetric smooth inner wall of the stator out. Due to the centrifugal forces, the rotation exerts on the potting compound, this is in cavities and winding strands of the stator urged, and forms a closed at sufficiently high degree of filling homogeneous inner surface. The invention Method comes without a post-processing after the casting process and allows a homogeneous and complete Filling the stator winding. By the invention is thus allowing a stator to be fully shed, without a subsequent stator through hole attached must become. In addition, there is the advantage that the potting compound reliably fills the stator winding and cavities and forms a smooth rotor-facing surface.

rotiert, wobei g die Erdbeschleunigung und r der kleinste Radius ist, den die Vergussmassenoberfläche nach dem Verguss des Stators einnehmen soll. Durch eine solche Mindestdrehzahl ist garantiert, dass die Erdanziehungskraft F_g = mg kleiner als die Zentrifugalkraft F_Z = mω²r ist und die Vergussmasse radial nach außen statt zur Erdoberfläche drängt. Aus der Formel erkennt man, dass die notwendige Mindestdrehzahl mit zunehmendem Radius abnimmt. So ergibt sich für einen Radius der Vergussoberfläche von z. B. 250 mm eine Mindestdrehzahl während des Vergießens und Aushärtens von zirka 60 1/min. Des Weiteren ist es vorteilhaft, dass der Stator mit einer Drehzahl, die mindestens 50% größer als die Mindestdrehzahl ist, rotiert. Damit wird sichergestellt, dass die Vergussmasse jeden Hohlraum zuverlässig ausfüllt. Ausgehend von obigem Beispiel bedeutet dies, dass ein Stator mit 250 mm Innenradius mit mehr als 90 1/min rotieren sollte.When using the above method, it is advantageous that the stator with a minimum speed of

rotates, where g is the gravitational acceleration and r is the smallest radius that the Vergussmassenoberfläche should take after the casting of the stator. By such a minimum speed is guaranteed that the gravitational force F _g = mg is smaller than the centrifugal force F _Z = mω ² r and urges the potting compound radially outward instead of the earth's surface. From the formula you can see that the necessary minimum speed decreases with increasing radius. This results for a radius of the casting surface of z. B. 250 mm a minimum speed during casting and curing of about 60 1 / min. Furthermore, it is advantageous that the stator rotates at a speed that is at least 50% greater than the minimum speed. This ensures that the potting compound reliably fills each cavity. Based on the above example, this means that a stator with 250 mm inner radius should rotate at more than 90 1 / min.

to Introduction of potting compound during the rotation process is provided in an embodiment of the method, to inject the potting compound radially from the inside to the outside. Thus, the potting compound evenly on the Statorinnenwandung distributed and can be in preheated liquid Apply state to the outside in the stator winding.

alternative has the above-mentioned radial injection of the potting compound it turned out to be particularly advantageous if the potting compound in the region of at least one of the two winding heads radially is introduced from the inside, so that the potting compound along the grooves spreads to the other winding head while the air the winding displaced

Of the Process can be in a particularly excellent embodiment in a vacuum atmosphere in a range of 1 to 10 mbar be carried out

The Inventive device for casting stators for electric motors with internal runners for carrying out the method described above a rotary shaft, a drive means for rotating the drive Rotary shaft and a mounted on the rotary shaft holding device for the longitudinal axial clamping of a stator. It becomes the Grouting the stator of this clamped in the holding device, and for pouring with flowable potting compound by means of the drive means set in rotation.

The Holding device can be designed arbitrarily. Usually this consists of two axial limiting discs, which after the Grouting be mechanically separated again from the stator. In a preferred Embodiment, however, includes the holding device instead of limiting disks two circular structures, which are part of the stator housing or attached to this and remain after the casting as part of the stator at this. This dispenses with the use of external limiting discs, otherwise would have to be treated again with release agent to to replace them, beyond that are the windings thermally over the annular structure in addition connected to the stator housing.

With In other words, the stator is connected to the rotating shaft with a suitable one Holding device axially clamped and by the drive device to its longitudinal axis set in rotation so fast that the preferably radially introduced from inside potting compound during the potting and also during hardening radially is thrown outward. This forms a Casting compound surface not on one end of the Stators off, but at the separation diameter, or in the Grooves or slot slots of the stator. This will be in the stator bore no displacement body needed anymore and there is a suitable design of the housing also no moldings in contact with the potting compound, which would have to be separated after potting. The potting compound is usually casting resin, in particular epoxy resin used, are also additives of fillers conceivable for increasing the thermal conductivity and advantageous. The centrifugal force of the rotating stator winding allows the penetration of the first flowable Potting compound in the smallest cavities, making an extremely Homogeneous potting without bubbles collection and with a high Quality of the potting surface allows becomes. In addition, a symmetrical casting around the center of rotation ensured the stator.

The The device outlined above can only use one for the rotation Have storage of the rotary shaft in the drive device. In a preferred embodiment is at the axial End of the rotary shaft relative to the drive device arranged an abutment device, which the rotation shaft with rotatably supports the clamped stator. Thus allows an abutment device a low-vibration rotation of the stator, especially when the stator has a high weight.

The Holding device can basically be constructed arbitrarily be. In a particularly advantageous embodiment the holding device comprises two axially opposite ones Winding head receiving means, the two windings of the Pick up and hold the stator. Since the winding heads thermally only are poorly connected to the stator, it is particularly important that they carefully during the rotational molding process poured and thus thermally connected to the stator. For this purpose, the winding-receiving means are designed so that they as a receiving and holding device of the stator at the same time Casting mold for the winding heads of the stator form. This advantageously allows that each winding head receiving means can be configured so that the winding head of the stator during molding process mitvergossen dimensionally accurate becomes.

In a preferred embodiment, the potting device further comprises a heater for heating the stator, which heats the stator at least before the rotational molding process so that the potting compound remains flowable. Due to the heat transferred from the heater into the stator, the potting compound remains fluid during the rotation process and can thus reach every cavity. For this it is conceivable that the heating device heats the stator to a sufficiently high operating temperature before the rotation process, which allows the casting compound to flow, and that the stator cools during the rotation process, or that the heating device also heats the stator during the rotation process,

Of Furthermore, it is conceivable and advantageous that the casting device a cooling device for cooling the stator includes. This allows the stator after curing of the potting compound faster so far as to be cool for the further Completion of the engine becomes manageable. The potting compound hardens by a chemical reaction that's increased by one Temperature is accelerated. The potting compound does not freeze by cooling the stator so that the cooling device advantageously only after completion of the curing process is put into operation to rapidly lower the temperature of the stator, so that it becomes manageable for further processing.

in principle the potting compound, for example, before the start of the rotation process by brushing, filling or otherwise as in the interior be brought to the stator, and during the rotation to distribute. This results in practice the problem that the liquid potting compound at the beginning of the rotation, as long as the Speed has not yet reached the minimum speed, not on the outer wall of the stator remains. In this case it is necessary to use the stator to set in rotation by a high spin exploit the flow inertia of the mass before the potting compound detached from the outer wall. In an excellent Embodiment, the casting device comprises a Vergussmasseneinbringungseinrichtung to at least before the beginning of Rotational casting process to introduce the potting compound in the stator. By Vergussmasseneinbringungseinrichtung is before the beginning of the Rotation process or during the rotation process potting compound sprayed or applied to the interior of the stator, and conditioned through the rotation evenly on the inner Distributed surface of the stator.

there it is particularly advantageous if the Vergussmasseneinbringungseinrichtung a spray nozzle is located along the longitudinal axis extends the clamped stator and the potting compound at least prior to the beginning of the rotational casting operation, radially outward flings. It is preferable that the spray nozzle the potting compound especially during the rotation of the stator emits radially outward. If such Vergussmasseneinspritzung not under the influence of a vacuum, so the problem arises that upon radial penetration of the resin into the grooves of the stator and that in the windings air is trapped, the unwanted Cavities generated. Thus, the above-described radial Injection preferably carried out under the influence of vacuum. A full-surface introduction of the potting compound means radial injection also has the disadvantage that the coating under certain circumstances the air gap to Reduced rotor so that very high demands on the Production accuracies result, so that the production costs considerably be increased.

alternative to the above-mentioned Vergussmasseneinbringungseinrichtung for the radial injection of the potting compound, it is advantageously conceivable that the potting compound in the region of the winding head radially from the inside is introduced, so that the potting compound along the Grooves spread to the other winding head while the air the winding displaced. So, in this alternative embodiment the Vergussmasseneinbringungseinrichtung at least one spray nozzle in the region of the winding overhang which at least precedes the potting compound Beginning of the rotation process, in particular injects into the stator grooves be, whereby the potting compound in the grooves to the opposite Can spread winding head. Thus, there is the advantage that the potting can be done so that only the grooves filled are covered, but not the entire stator with potting compound becomes. Furthermore, to avoid a vacuum atmosphere Air pockets are omitted, however, affects a vacuum influence also here on the homogeneity the Vergussmassenverteilung. The or the resin beams meet on relatively fast moving resin surface, the displaced the air from the stator grooves.

In terms of the just mentioned alternative embodiment of Vergussmasseneinbringungseinrichtung It is also advantageous that the jet direction of the spray nozzle is aligned obliquely to the direction of rotation. hereby indicates the speed of the injection-molding potting compound components in the circumferential direction of the stator, which is approximately the peripheral speed the resin surface corresponds to the resin jets to meet. This further increases the risk of air pockets minimized.

Furthermore, it is advantageous in relation to the alternative embodiment of the Vergussmasseneinbringungsvorrichtung when the at least one spray nozzle rotates with the stator, whereby the tangential relative velocity between inflowing potting compound ( 10 ) and the potting compound already present in the stator ( 10 ) is equal to zero. As a result, the risk of air bubbles is further reduced and ensures a homogeneous filling of the stator with potting compound.

The Device may advantageously comprise a measuring device, for controlling the Rotationsgussvorgangs at least one of Parameter Temperature of the stator, applied potting compound or Rotational speed measures. To ensure the quality of the Statorvergusses is a regulation of the Vergussvorgangs, which itself operated by a measuring device, indispensable. It is conceivable that the Measuring device measures at least the temperature of the stator to a sufficiently high flowability of the potting compound to be able to adjust, and monitors the rotational speed of the rotational molding, by sufficiently high centrifugal forces on the flowable potting compound exercise.

in the The invention will now be described by way of example only pointing drawings explained in more detail.

It demonstrate:

1 FIG. 1 is a schematic sectional view through a non-cast stator and rotor of an electric motor; FIG.

2 : schematic representation of an embodiment of a rotational molding of a stator with different Vergussstufen;

3 FIG. 1 is a schematic sectional view through a potted stator and rotor of an electric motor; FIG.

4 an embodiment of a Vergussvorrichtung for Statorvollverguss.

It should be noted that the following illustrations of a stator ( 01 ) is only a schematic sketch drawing, which should only clarify the basic principle of the rotating casting compound distribution. As a rule, the stator is a classic three-phase stator with at least three windings and a corresponding complex distribution of the stator slots and winding profiles. However, for reasons of clarity, a realistic complex representation of the stator ( 01 ) waived.

1 shows a schematic representation of a section through the laminated laminated core 02 a stator 01 , The stator 01 consists of many consecutively arranged individual sheet metal parts, which are the laminated laminated core 02 form. The lamination serves to reduce the formation of eddy currents due to the changing magnetic field, and thus to keep electrical losses as low as possible. Inside the stator 01 is a rotor 03 rotatably mounted, whose rotor teeth are indicated schematically. In the rotor teeth of the rotor 03 are typically the rotor windings, or laid in the case of a squirrel cage copper cage. The laminated core 02 of the stator 01 has stator teeth 05 on which the stator winding 04 take up. In the example shown is a single-phase AC motor, the only one stator winding 04 having.

ist, um seine Längsachse in Rotation versetzt. Im Inneren des laminierten Blechpakets 02 befindet sich eine Spritzdüse 06, die radial nach außen eine Vergussmasse 10 abgibt, die nach einer gewissen Einbringzeit den Stator zum Teil, wie in 2b dargestellt, ausfüllt (teilweiser Verguss 08). Prinzipiell kann die Vergussmassen-Einbringung 07 auch andersartig, beispielsweise durch vorheriges Bestreichen der Statorinnenwandung mittels Vergussmasse oder durch Einpressen mittels eines Formstempels erfolgen, jedoch hat sich insbesondere das Einspritzen von Vergussmasse durch eine im Bereich der Rotationswelle liegenden Spritzdüse 06 radial nach außen als vorteilhaft herausgestellt, da hierdurch eine äußerst gleichmäßige Vergussmassen-Einbringung 07 und -Verteilung sichergestellt wird. Nach einer gewissen Rotationszeit füllt die Vergussmasse 10 den Stator 11 vollständig aus – wie in 2c gezeigt (vollständiger Verguss 09).To the stator 01 on the one hand to isolate electrically, on the other hand to protect against wear and environmental influences, the stator winding is usually encapsulated with a potting material. The 2a to 2c show an embodiment of a rotary encapsulation according to the present invention. For this purpose, as in 2a pictured, the unsoldered stator 01 initially with a rotational speed n which is greater than a minimum speed

is set in rotation about its longitudinal axis. Inside the laminated laminated core 02 there is a spray nozzle 06 , the radially outward potting compound 10 which, after a certain introduction time, partially releases the stator, as in 2 B shown, filled in (partial potting 08 ). In principle, the Vergussmassen- contribution 07 also differently, for example, by previously brushing the Statorinnenwandung by means of potting or by pressing in place by means of a forming die, but in particular the injection of potting compound has a lying in the region of the rotary shaft spray nozzle 06 radially outwardly proved to be advantageous, as a result, an extremely uniform Vergussmassen-contribution 07 and distribution is ensured. After a certain period of rotation, the potting compound fills 10 the stator 11 completely off - as in 2c shown (complete potting 09 ).

Finally shows 3 the result of the rotation process:
a potted stator 11 whose potting compound is close to the rotor 03 ranges, leaving only a small air gap between potting compound 10 and rotatable rotor 03 remains.

Should in this case the potting compound 10 Furthermore, highly permeable properties, so may by the small air gap and the magnetic properties of the potting compound 10 an improved termination of the magnetic circuit between the stator 11 and rotor 03 achieved and thus the efficiency of the engine can be significantly increased. This is usually done by a two-stage potting process, wherein in a first potting the slot slots of the stator 11 with thermally conductive potting compound 10 is filled, and in a second potting the inner wall of the stator 11 with a potting compound 10 is cast with magnetically hompermeable fillers.

Finally, the shows 4a an embodiment of a casting device 12 for carrying out the rotary casting. The casting device 12 includes a drive device 13 that is a rotation shaft 17 drives. On the rotation shaft 17 is a holding device 15 arranged, the two circular boundary plates 15A . 15B includes the A side and B side of a stator 16 flank, and the stator 16 record and hold. In this case, the limiting discs can in particular receive the winding heads by means of suitable recesses and connect them to the stator housing in a heat-conducting manner. At the axial end of the rotary shaft 17 is a counter bearing device 14 arranged, which is the rotation shaft 17 rotatably supports. This turns the rotary shaft 17 on the one hand by the drive device 13 , on the other hand of the abutment device 14 supported, so even stators 16 large mass can be shed vibration-free by means of the rotational casting process.

In the 4b is a section through the casting device 12 shown. The sectional view makes it obvious that the stator 16 , which is a stator winding 20 includes, during the rotation process through the spray nozzle 18 with potting compound 10 is shed. The potting compound 19 takes place in that the flowable potting compound 10 along the length of the spray nozzle 18 is thrown radially outwards, and on the inner wall of the stator winding 20 invests. By the rotation of the stator 16 becomes the flowable potting compound 10 in the cavities of the stator winding 20 pressed, and forms after curing a rotationally symmetrical casting surface inside the stator 20 out.

01

Cast on non stator

02

laminated laminated core

03

rotor

04

stator

05

stator tooth

06

Vergussdüse

07

Rotationsvergussvorgang

08

partial grouting

09

Full grouting

10

potting compound

11

Molded stator

12

potting fixture

13

driving means

14

Abutment means

15

holder

16

stator

17

rotary shaft

18

nozzle

19

Rotationsvergussvorgang

20

stator

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 2606401 A1 [0005]
• - DE 69601623 T2 [0005]
• - DE 102005058219 A1 [0005]
• WO 2004/008603 A2 [0005]
• - DE 102004034428 A1 [0006]
• - JP 59123450 A [0006]
• WO 2005/027306 A2 [0006]
• - DE 1924729 A [0007, 0007]
• - DD 97782 [0007, 0007, 0007]

Claims (19)

Method for casting stators for electric motors with internal rotors, wherein the stator ( 01 . 11 . 16 ) about its longitudinal axis during and / or after the introduction of flowable potting compound ( 10 ) is rotated so that the potting compound ( 10 ) during the rotational casting process ( 07 . 19 ) cavity filling and evenly distributed. Method for stator encapsulation according to claim 1, characterized in that the stator ( 01 . 11 . 16 ) with a minimum speed of

where g is the gravitational acceleration and r is the smallest radius that the potting compound surface leaves after potting the stator ( 01 . 11 . 16 ) should take. Method for stator encapsulation according to claim 2, characterized in that the stator ( 01 . 11 . 16 ) is rotated at a speed at least 50% greater than the minimum speed. Method for stator encapsulation according to one of the preceding claims, characterized in that the potting compound ( 10 ) during the rotation process ( 07 . 19 ) is sprayed radially from the inside to the outside. Method for stator encapsulation according to one of the preceding claims 1 to 4, characterized in that the potting compound ( 10 ) is introduced radially from the inside in the region of at least one of the two winding heads, so that the potting compound propagates along the grooves to the other winding head and thereby displaces the air from the winding. Statorverguss according to claim 5, characterized characterized in that the grout application under a vacuum atmosphere, especially in a vacuum pressure range of 1 to 10 mbar becomes. Device for encapsulating stators for internal-rotor electric motors for carrying out the method according to one of Claims 1 to 6, the device ( 12 ) a rotary shaft ( 17 ), a drive device ( 13 ) for rotationally driving the rotary shaft ( 17 ) and one on the rotary shaft ( 17 ) mounted holding device ( 15 ) for longitudinal axial clamping of the stator ( 01 . 11 . 16 ). A molding apparatus according to claim 7, characterized in that at the axial end of the rotary shaft ( 17 ) relative to the drive device ( 13 ) an abutment device ( 14 ) is arranged, which rotates the shaft ( 17 ) with the clamped stator ( 01 . 11 . 16 ) rotatably supports. Potting device according to one of claims 7 or 8, characterized in that the holding device ( 15 ) comprises two axially opposite winding-receiving means, which are in particular formed as circular structures and the two winding heads of the stator ( 01 . 11 . 16 ) record and hold. Potting device according to claim 9, characterized in that each winding head receiving means is designed such that the winding head of the stator ( 01 . 11 . 16 ) during the rotational molding process ( 07 . 19 ) is cast in shape. A molding apparatus according to claim 9 or 10, characterized characterized in that each winding head receiving means after the casting Inseparably connected to the stator remains and the winding heads thermally connects to the stator housing. Potting device according to one of the preceding device claims, characterized in that the device ( 12 ) further comprises a heater for heating the stator ( 01 . 11 . 16 ), which at least before the Rotationsvergussvorgang ( 07 . 19 ) the stator ( 01 . 11 . 16 ) so heated that the potting compound ( 10 ) remains fluid. Potting device according to one of the preceding device claims, characterized in that the device ( 12 ) further comprises a cooling device for cooling the stator ( 01 . 11 . 16 ), which at least after the Rotationsvergussvorgang ( 07 . 19 ) the stator ( 01 . 11 . 16 ) cools down so that the stator is quickly handled again after curing of the potting compound. Potting device according to one of the preceding device claims, characterized in that the device ( 12 ) further comprises a Vergussmasseneinbringungseinrichtung to at least before the start of Rotationsvergussvorgangs ( 07 . 19 ) a potting compound in the stator ( 01 . 11 . 16 ). Potting device according to claim 14, characterized in that the Vergussmasseneinbringungseinrichtung a spray nozzle ( 06 . 18 ), which extends along the longitudinal axis of the clamped stator ( 01 . 11 . 16 ) and the potting compound ( 10 ) at least prior to the start of the rotary encapsulation process ( 07 . 19 ) hurls radially outward. A molding apparatus according to claim 14, since characterized in that the Vergussmasseneinbringungseinrichtung comprises at least one spray nozzle in the region of the winding head, the casting compound ( 10 ) at least before the start of the rotation process ( 07 . 19 ) in particular injected into the stator, whereby the potting compound in the grooves can spread to the opposite winding head. A molding apparatus according to claim 16, characterized that the jet direction of the spray nozzle obliquely is aligned to the direction of rotation. Potting device according to claim 16 or 17, characterized in that the at least one spray nozzle rotates with the stator, whereby the tangential relative velocity between inflowing potting compound ( 10 ) and the potting compound already present in the stator ( 10 ) is equal to zero. Potting device according to one of the preceding device claims, characterized in that the device ( 12 ) further comprises a measuring device which is used to control the rotary encapsulation process ( 07 . 19 ) at least one of the parameter temperature of the stator ( 01 . 11 . 16 ), applied potting compound ( 10 ) or rotational speed.