Support, use thereof during trickle impregnation, trickling system, system component thereof, and trickle impregnation method

Abstract

In order to improve the impregnation of stators (48) in series production, the invention relates to supports (28) comprising at least one rolling surface (58a, 58b) and system components of a trickling system (26) comprising a roller device. The supports (48), with clamped stators (10) or stators (10) having a cylindrical outer surface suitable as a rolling surface (58a, 58b), rest on the system components purely due to gravity. This eliminates the need for complex actuators of clamping devices to hold the stators for trickling or gelling.

Description

Holder, use thereof in trickle impregnation, trickle system and system component thereof and method for trickle impregnation The invention relates to a holder for holding, rotating, and transporting a stator during resin impregnation. Furthermore, the invention relates to the use of such a holder for holding a stator during trickle impregnation. Furthermore, the invention relates to a system component of an impregnation system for impregnating stators in series production, which system is designed to handle a stator held in such a holder. Furthermore, the invention relates to a trickle system for trickle impregnation of stators, comprising a plurality of such holders. Finally, the invention relates to a method in which a stator is held in such a holder for trickle impregnation. For the technological background, please refer to the following literature: [1] DE 1 279 156 A [2] DE 102019 120 713 A1 [3] DE 102017 001 939 A1 [4] DE 102019 121 956 A1 [5] US 3696 420 A1 [6] JP ​​2015-76984 A [7] JP 2015-318692 A [8] WO 2022 / 171353 A1 [9] DE 102019 106 392 A1

[0010] WO 2019 / 123137 A1

[0011] WO 2018 / 154277 A1

[0012] DE 102021 105 959 A1

[0013] DE 102019 004 954 B3 Units, devices, and methods used for the impregnation of stators, particularly trickle impregnation, are known from references [1] to

[0013] . Stators are clamped in holders. The object of the invention is to provide improved possibilities for handling stators during trickle impregnation in the course of industrial large-scale production. To achieve this object, the invention provides a holder according to claim 1. An advantageous use of the holder, a system component for handling a stator held in such a holder, a trickling system with several such holders and a method for Drip impregnation using such a holder is the subject of further independent claims. Advantageous embodiments are the subject of the subclaims. According to a first aspect thereof, the invention provides a holder for holding, rotating and transporting a stator during impregnation of the stator with resin, wherein the holder has a clamping device for clamping the stator and at least one rolling surface for rollingly supporting the rotating holder with the clamped stator. Preferably, the holder is designed as a cage which surrounds the clamped stator during use. It is preferred that the at least one rolling surface is a rolling surface encircling the stator clamped in use. Note: For the purposes of this disclosure, “the at least one rolling surface” may mean a single rolling surface provided on the holder, one of a plurality of rolling surfaces provided on the holder, some of a plurality of rolling surfaces provided on the holder, or all of the rolling surfaces provided on the holder. It is preferred that the at least one rolling surface is provided on a radially most projecting outer circumference of the holder. It is preferred that at least one first and at least one second axially spaced rolling surface are provided. It is preferred that the first rolling surface is provided at a first axial end portion of the holder and that the second rolling surface is provided at a second axial end portion of the holder. It is preferred that the at least one rolling surface is formed on at least one ring region of the holder. It is preferred that the first rolling surface is formed on a first ring element of the holder and the second rolling surface is formed on a second ring element of the holder and that the first and second ring elements are axially connected to each other. It is preferred that ring elements of the holder are connected to each other by means of axial struts. It is preferred that the first and second rolling surfaces have the same diameter. In some embodiments, it is provided that the at least one rolling surface or at least one of several rolling surfaces is at least partially designed in the shape of a cylinder jacket. In some In some embodiments it is provided that the at least one rolling surface or at least one of a plurality of rolling surfaces is conical in design at least in regions. In some embodiments it is provided that the at least one rolling surface or at least one of a plurality of rolling surfaces is ball-shaped in design at least in regions. In some embodiments it is provided that the at least one rolling surface or at least one of a plurality of rolling surfaces is convexly curved in axial section at least in regions. In some embodiments it is provided that the at least one rolling surface or at least one of a plurality of rolling surfaces is concavely curved in axial section at least in regions. In some embodiments it is provided that the at least one rolling surface or at least one of a plurality of rolling surfaces has at least one groove.In some embodiments, it is provided that the at least one rolling surface or at least one of several rolling surfaces has a circumferential annular projection or a circumferential rib. It is preferred that the at least one rolling surface has at least one first circumferential conical region and at least one second circumferential conical region, wherein the first and the second conical region are inclined in opposite directions and / or are mirror images of one another. It is preferred that a circumferential toothing is provided for positively driving a rotation of the holder with the stator clamped in place. It is preferred that the toothing is formed on a separate ring element of the holder or on a ring element which also has the rolling surface or one of several rolling surfaces. It is preferred that the clamping device is designed for radial and / or axial positive and / or non-positive clamping of the stator on an outer side of the stator. It is preferred that the clamping device comprises radially movable clamping elements with radially inwardly directed clamping surfaces and / or axially movable clamping elements with clamping surfaces directed axially towards one another. It is preferred that the clamping elements are arranged radially movable on the struts. It is preferred that the clamping device has at least one thread for moving at least one clamping element of the clamping device by screwing. It is preferred that the clamping device has at least one spring for elastically clamping the stator. It is preferred that the clamping device is designed to receive the stator in a release position without dismantling clamping elements of the clamping device. It is preferred that the clamping device comprises clamping elements which are arranged radially inside the at least one rolling surface. It is preferred that clamping elements of the clamping device are formed on ring elements of the holder, on the outer circumference of which the at least one rolling surface is formed. It is preferred that the struts are designed as telescopic elements. In some embodiments, it can also be provided that the clamping device has at least one bayonet lock receptacle with a slot for inserting a radial projection of the stator and a holding region arranged offset from the slot for holding the radial projection. In some embodiments, it is provided that the clamping device has a plurality of bayonet lock receptacles, which are offset from one another in the circumferential direction or distributed over the circumference. In some embodiments, it is provided that the clamping device has at least a first and a second bayonet lock receptacle, which are arranged at different axial positions. In some embodiments, it is provided that the at least one bayonet closure receptacle is formed on a ring element of the holder, on the outer circumference of which the at least one rolling surface or one of several rolling surfaces is formed. Preferably, the holders for the stators are designed such that the stator is held or clamped at the outer diameter or outer contour. Preferably, the holders are designed such that both axial sides of the stator (winding head sides) are freely accessible. The holder is preferably designed as a cage. In particular, the holder is designed such that it does not protrude axially beyond a laminated core of a stator clamped therein during operation. Accordingly, according to a further aspect, the invention also provides an arrangement comprising the holder according to one of the preceding or one of the embodiments described below and the stator to be held or held therein. According to a further aspect, the invention proposes the use of a holder according to one of the preceding embodiments for holding and rotating a stator during trickling impregnation during trickling and gelling. It is preferred that the holder with clamped stator in a gelling device for gelling by placing the at least one rolling surface on a rolling device of the gelling device solely by is held by gravity and rotated about an axis of rotation coinciding with a central axis of the stator. Preferably, the at least one rolling surface of the holder is arranged axially in the region of the laminated core of the stator, wherein the holder does not protrude beyond the laminated core. It is preferred that the holder with clamped stator is held in a trickling device for trickling impregnation by resting the at least one rolling surface on a rolling device of the trickling device solely by gravity and is rotated about an axis of rotation coinciding with a central axis of the stator. It is preferred that the holder rolling on the rolling device of the trickling device is inclined during trickling by means of the rolling device about a substantially horizontal inclination axis extending transversely to the axis of rotation. It is preferred that the holder with clamped stator for trickling is lifted from a delivery track by means of the rolling device of the trickling device. It is preferred that the respective rolling device has a plurality of guide elements on which the at least one rolling surface is deposited, wherein the guide elements are designed to guide the holder in such a way that it executes a concentric rotation about its longitudinal axis. It is preferred that the guide elements of the rolling device are selected from a group comprising rollers, pinions, contoured wheels, gears, rails, circulating chains, running surfaces, rollers with flanged wheels, rollers with V-grooves, rollers with a spherical running surface, rollers with an annular projection on the running surface, rollers with grooves on the running surface, rollers connected by means of a chain or a conveyor belt, actively driven rollers, actively driven pinions and rollers, pinions and contoured wheels connected by a common shaft. It is preferred that at least one of the guide elements of the rolling device initiates the rotational movement into the holder. It is preferred that the or at least some of the guide elements are rotatable about a respective rotational axis whose position deviates from the position of the rotational axis of the holder. It is preferred that the guide elements comprise a first to fourth roller, wherein the first and second rollers engage the at least one rolling surface of the holder in an angular position between 3 o'clock and 6 o'clock at an axial distance from one another, and the third and fourth rollers engage the at least one rolling surface in an angular position between 6 o'clock and 9 o'clock at an axial distance from one another. It is preferred that the respective rolling device has adjacent support locations for a first and a second holder, wherein a common shaft or roller is arranged between the receiving locations, on which the first holder and the second holder rest, so that a rotation of one holder can be transmitted to the second holder via the common shaft or roller or that the first and the second holder are driven in rotation via the common shaft or roller. It is preferred that a series of stators are impregnated by trickle impregnation in a large-scale production process, each stator being held in a separate holder according to one of the preceding embodiments for trickling and gelling. According to a further aspect, the invention provides a system component of an impregnation system for impregnating stators in series production, comprising a rolling device which is designed to hold one or more holders according to one of the preceding embodiments, each with a clamped stator, by placing the at least one rolling surface on the rolling device and to rotate it about an axis of rotation coinciding with a central axis of the stator. The system component can, for example, be a gelling device for gelling resin previously introduced into the stator held by the holder. It is preferred that the gelling device is selected from the group comprising a convection oven, a gelling device with an induction coil, a stationary gelling device to which the stators held in the holders are transported after the resin application, and a continuous oven through which the stators held in the holders are cycled. The system component can further be, for example, a trickling device with at least one trickling nozzle for trickling resin. In particular, when the system component is designed as a trickling device, it is preferred that the rolling device is designed to lift the at least one holder with the stator clamped therein rolling thereon and / or to incline it relative to the horizontal. It is preferred that a plurality of drip nozzles for dripping resin onto winding heads are provided on both sides of the stator clamped in the holder. The system component can also be a curing device for curing the gelled resin. The system component can also be a transport device for transporting a series of holders, wherein several of the rolling devices are arranged on a conveyor belt. It is preferred that the rolling device comprises a plurality of guide elements on which the at least one rolling surface can be placed, wherein the guide elements are designed to guide the holder in such a way that it executes a concentric rotation about its longitudinal axis. It is preferred that the guide elements of the rolling device are selected from a group comprising rollers, pinions, contoured wheels, gears, rails, circulating chains, running surfaces, rollers with flanged wheels, rollers with V-grooves, rollers with a spherical running surface, rollers with an annular projection on the running surface, rollers with grooves on the running surface, rollers connected by means of a chain or a belt, actively driven rollers, actively driven pinions and rollers, pinions and contoured wheels connected by a common shaft. It is preferred that at least one of the guide elements of the rolling device initiates the rotational movement into the holder. It is preferred that the or at least some of the guide elements are rotatable about a respective rotational axis whose position deviates from the position of the rotational axis of the holder. It is preferred that the guide elements comprise a first to fourth roller, wherein the first and second rollers engage the at least one rolling surface of the holder in an angular position between 3 o'clock and 6 o'clock at an axial distance from one another, and the third and fourth rollers engage the at least one rolling surface in an angular position between 6 o'clock and 9 o'clock at an axial distance from one another. It is preferred that the rolling device has adjacent support locations for a first and a second holder, wherein a common shaft or roller is arranged between the receiving locations, which is designed so that the first holder and the second holder rest thereon, so that a rotation of one holder can be transmitted to the second holder via the common shaft or roller or that the first and the second holder are driven in rotation via the common shaft or roller. One aspect of the invention relates to an impregnation plant for impregnating stators in series production, comprising a transport device for transporting a series of stators through areas of the impregnation plant, wherein the transport device has a circulating transport track with a feed area and a return area and deflection areas therebetween and a conveyor belt which is designed so that the stators can be placed or lifted off the conveyor belt transversely to the respective stator axis and rest on the conveyor belt in a rotating manner at least in sections during transport through the feed or return area. It is preferred that the conveyor belt in the forward region is arranged below the stator axes of the stators located in the forward region during operation, so that the stators can be transported through the forward region of the transport track while resting on the conveyor belt, and that the transport device in the return region has a running surface for the stators to be transported through the return region to rest on. It is preferred that the conveyor belt is arranged in the return region above the stators located in the return region during operation and is designed to drive the movement of the stators rolling on the running surface. It is preferred that a loading and unloading point is arranged at a beginning of the advance region of the circulating transport track and is designed such that the stators can be placed on the conveyor belt and lifted off therefrom transversely to the stator axis. It is preferred that the deflection regions have deflection curves for detecting the stators and deflecting their movement paths. It is preferred that the feed region and the return region are arranged one above the other or that the feed region is arranged above the return region. It is preferred that the advance region of the transport path leads through an impregnation region and a gelling region of the impregnation system, wherein a rotary drive gear is provided in the impregnation region and the gelling region for driving a rotary movement of the stators lying on the conveyor belt. It is preferred that the return region and / or at least one of the deflection regions leads through a curing region of the impregnation plant located after a gelling region in the transport direction. It is preferred that the conveyor belt has at least one circulating traction means and rollers or cylinders attached thereto for rolling support of the stators, which rollers or cylinders are rotatable about axes of rotation extending transversely to the transport direction. It is preferred that the rollers or cylinders are selected from a group comprising rollers with flanged wheels, rollers or cylinders with pinions, rollers with V-grooves, rollers with a crowned running surface, rollers with an annular projection on the running surface, rollers with grooves on the running surface, actively driven rollers, actively driven pinions and rollers, pinions and contour wheels connected by a common shaft. It is preferred that receiving areas on the conveyor belt for engaging a stator each comprise a first to fourth roller, wherein the first and second rollers are arranged axially spaced from one another to engage at least one rolling surface of the cylindrical stator or a holder holding the stator in an angular position between 3 o'clock and 6 o'clock, and the third and fourth rollers are arranged axially spaced from one another to engage the at least one rolling surface in an angular position between 6 o'clock and 9 o'clock. It is preferred that the conveyor belt or a rolling device of the impregnation plant has adjacent support locations for a first and a second stator, wherein a common shaft or roller is arranged between the support locations, which is designed so that the first and second Stator rests on it so that a rotation of one stator can be transferred to the second stator via the common shaft or roller or that the first and second stator are driven in rotation via the common shaft or roller. It is preferred that the conveyor belt, in addition to the circulating traction means, has at least one of the forward region and the return region, a second traction means which is movable independently of the circulating traction means and is designed to drive a rotational movement of the stators or the rollers or cylinders. Preferred embodiments of the invention relate to an impregnation system, in particular a trickling system, with a conveying principle designed as a circulation system. In some embodiments, the impregnation system has several system areas or system components through which stators can be guided by means of the conveyor belt. For example, the impregnation system designed as a trickling system has at least some of the system components trickling device, gelling device and curing device. The impregnation system preferably has a handling unit for loading, unloading, or transferring stators. In some embodiments, the handling unit is configured to grip at least one stator at a time along its inner circumference. In some embodiments, the handling unit is configured to grip the at least one holder. In particularly preferred embodiments, the conveyor belt has rolling devices which are designed for the rotating support of at least one rolling surface on the stator or the holder, wherein the conveyor belt is designed for conveying the stators by a plurality of system components arranged one behind the other in the conveying direction. Preferably, the impregnation system has a loading station which is designed for placing a group of stators held in the holders onto the conveyor belt in batches. In particularly preferred embodiments, different system components or areas of the impregnation system are distributed across multiple levels, so that a leading run of the conveyor belt is designed for transporting the stators in one level, and a returning run of the conveyor belt is designed for transport in a further level. For example, one of the runs is designed and arranged in particular such that the stators (possibly clamped in holders designed in particular as cages) rest thereon and the conveyor belt thus engages below the stators, and the other run of the conveyor belt is designed and arranged in such a way that the conveyor belt engages above the stators. Preferably, the leading run runs in an upper level, so that the stators rest thereon and can be driven in rotation, and the returning run runs in a lower level, without a separate rotary drive for the stators. According to a further aspect, the invention provides an impregnation method for impregnating stators in series production using an impregnation system according to one of the preceding embodiments. In some embodiments, the stators are clamped in a respective holder during trickling and during gelling. In some embodiments, the stators are transported from the dripping stage to the gelling stage using the transport device / conveyor system while simultaneously maintaining rotation around the horizontal axis of rotation (no interruption of rotation). In some embodiments, one level is a dripping and gelling level, where dripping and gelling take place. In some embodiments, the transport device is designed such that the stators can be fed directly transversely to the stator rotation axis of the transport device and removed from it, for example to be lifted upwards for trickling and pivoting. In some embodiments, a linear portal is provided as a handling unit for loading and / or unloading at a loading point, with which at least one stator or preferably a group of stators (batch) can be placed on the conveyor belt transversely to the stator axis and / or lifted from it transversely to the stator axis. The stators do not need to be moved axially for loading and unloading. The winding head sides are more easily accessible. In embodiments of the invention, the transport device is designed such that no active clamping or actuation is required to fix the stator on the conveyor system, i.e. no actuators. In some embodiments, the conveyor system - the transport device, in particular for transporting from trickling to gelling - is designed as a circulating system which is also capable of transporting the stators in a circulating manner. One of the advantages of such a circulation system is that if a component fails or malfunctions, e.g., if the loading system fails, the trickling and gelling process does not need to be interrupted, as the stators simply continue to cycle. There is no disadvantage if the stators pass through the system multiple times, as in this case, the trickling process is simply carried out "dry," i.e., without the addition of resin, and reheating of the stators is permitted. In some embodiments, the reclaiming takes place via the circulating conveyor belt. In other embodiments, a first conveyor belt is provided for conveying through the forward section and a second conveyor belt for conveying through the return section of the transport track. In some embodiments, the stators are transported back to the original loading location by the transport device, i.e., in other words, a loading station is also designed for unloading; or loading and unloading of the stators take place at the same location. In some embodiments, the reclaiming preferably takes place in a vertically offset plane at which a further curing process takes place in an oven (hereinafter also referred to as the curing plane or reclaiming plane). In some embodiments, one of the deflection areas, in particular from a trickling and / or gelling level to a curing and / or return conveying level, is also located in the or in a further oven. In some embodiments, the rotational movement (in particular, actively driving the rotation of the stators) is omitted during the transfer of the stator between the planes. This is particularly the case when the stators are already welded and the transfer takes place in or after a curing area. In some embodiments, the rotational movement (in particular the active driving of a rotation of the stators) in the return area, in particular in a lower level - e.g. curing area - is omitted. In some embodiments, the recirculation of the stators in the return zone is mechanically coupled to the conveyor belt active in the forward zone. For example, only corresponding guide elements are provided in the return zone, such as on the return conveyor level. In some embodiments, the conveyor belt active in the forward movement area is also used to roll the stators back in the return movement area. In particular, rollers arranged on the conveyor belt are also used to engage the stators for return transport. In some embodiments, the conveyor belt is designed and arranged such that it engages the stators at least in one of the deflection areas, so that it is used for deflection—e.g., together with guide elements, in particular guide elements that form a deflection curve. In particular, the rollers arranged on the conveyor belt are used for transport during transfer between levels of the impregnation system. In some embodiments, the rotational movement of the stators is limited to a trickling and gelling range. In this case, the "rotational movement" refers specifically to a separately driven rotational movement, i.e., not just rolling on a running surface during further indexing. Preferred embodiments of the impregnation plant comprise a circulation system comprising a transport device with a conveyor belt on a trickling and gelling level, which is designed to cycle the stators from the trickling area to the gelling area and to rotate them around their own horizontal axis of rotation at least between the trickling and gelling areas, wherein deflection systems are provided at each end, which are designed to cycle the stators, in particular by means of conveying elements of the transport device - more particularly by means of the conveyor belt - into a further level, wherein a return conveyor level is provided, wherein the transport device is designed to cycle the stators further through the return conveyor level by means of the conveying elements - in particular by means of the conveyor belt, wherein the transport device is designed in such a way thatthat the stators can be loaded and unloaded transversely to the stator longitudinal axis without loosening the clamping devices. According to a further aspect, the invention provides a trickling system for the trickling impregnation of stators, comprising a plurality of holders according to one of the preceding embodiments and at least one or preferably a plurality of system components according to one of the preceding embodiments. For example, the trickling system comprises at least some of the system components: trickling device, gelling device, transport device, and curing device, each of which is provided with a rolling device for depositing the rolling surfaces of the holder thereon. The trickling system preferably has a handling unit for loading, unloading, or transferring stators held in the holders. In some embodiments, the handling unit is configured to grip at least one stator at its inner circumference. In some embodiments, the handling unit is configured to grip the at least one holder. Preferably, the trickling system comprises a conveyor belt with rolling devices which are designed to support the at least one rolling surface of the holder in a rotating manner, wherein the conveyor belt is designed to convey the stators held in the holders through a plurality of system components arranged one behind the other in the conveying direction. Preferably, the trickling system has a loading station which is designed for placing a group of stators held in the holders onto the conveyor belt in batches. According to a further aspect, the invention provides a method for trickle impregnation of a winding stator, comprising the steps: Providing a holder according to one of the preceding embodiments, clamping the stator in the clamping device, Performing trickling and gelling on the stator held in the holder, wherein the holder rolls over the at least one rolling surface to rotate the stator. The method preferably comprises using the holder according to one of the above embodiments of use. Preferably, one or more system components according to one of the above embodiments are used in the method. Preferably, the method is carried out by means of a trickling system according to one of the preceding embodiments. Preferred embodiments of the invention relate to a holder, a use of such a holder, a device and a method for drip-coating stators. Advantageous embodiments of the invention enable the provision of a method and / or a device for dripping stators, • in which both winding head areas are freely accessible for the trickling nozzles during the trickling process, while the stator rotates continuously around the longitudinal axis and / or • where the transfer from the trickling process to the gelling process takes place without interrupting the continuous rotation and / or • where, during gelling and maintaining continuous rotation, the stator is not picked up at the inner diameter in order to prevent local resin accumulation at the inner diameter, and / or • which offer a solution to the problem that, since gelling mainly takes place in an oven at temperatures up to 200°C and depending on the resin used, the temperature can also be higher, the current actuators within the oven are relatively expensive, and / or • where the oven is designed to be resistant to contamination, as cleaning is always time-consuming due to the cooling and heating times and negatively affects availability, and / or • who do without expensive and vulnerable actuators in the thermally curing gelling area (oven) and / or • where in the event of process disruptions and thus the stator running out, directly affected components can be easily removed and cleaned, and / or • where the stator is not rolled directly on the outer diameter, thus avoiding damage to the outer diameter or breakage of welded joints on the stator, and / or • which can also process stators that do not have a favorable cylindrical outer contour, ie have local elevations and depressions such as grooves, weld seams, fastening tabs, orientation lugs, etc., and / or • where stators with different lengths and diameters / outer contours can be accommodated in the furnace without retooling the device and / or • where the stators can be placed very close to each other for good utilization of the setting area and / or the trickling area, including for simultaneous processing of several stators as a group, or also called batch, and / or • in which the stators are ideally arranged transversely to the longitudinal axis (stator axis) in order to enable simultaneous transport over a longitudinal axis of the stators gripper / transport system that continues to rotate the stators during transport from trickling to gelling. In particularly preferred embodiments of the invention, a temporary holder (cage) is mounted around the stator as a holder during dripping and gelling. In particular, the cage (receptacle) used as a holder is located predominantly on the outer diameter of the stator laminated core. In particular, the holder (cage / holder) is designed to be held by gravity via a device in the gelling area, meaning that no clamping movement or permanently installed actuator is required for the holder in the gelling oven. In particular, the cage is designed so that it can rotate concentrically around its longitudinal axis. In particular, the cage and the gelling device are designed in such a way that the cage can be driven in the gelling area. In particular, the holder itself does not have any dirt-sensitive rolling bearings or the like, which is disadvantageous due to the high risk of contamination due to a possible leaking stator. In preferred embodiments of the invention, this cage serving as a holder is placed together with the stator in the gelling area with thermal curing. In particular, the cage used as a holder is placed on several rollers or similar in the gelling area, which are able to guide the cage in such a way that it performs a concentric rotation around the longitudinal axis (rollers, pinions, contour wheels, gears). In particular, there is at least one roller or element that introduces the rotational movement into the cage. In particular, the guidance of the cage and rotation is possible without any additional actuators. In particular, the rotation axis of the element in the gelling area for guiding the cage is in a different position than the rotation axis of the cage, so this element does not rotate concentrically to the cage. In particular, the element for guiding and positioning the cage in the gelling area simultaneously also introduces the rotational movement around the longitudinal axis into the cage. In some embodiments, the holder, in particular designed as a cage, may have at least one or more of the additional features / improvements explained below. In currently preferred embodiments, the stator is clamped radially across the outer surface of the cage. In some embodiments, this results in no axial projection of the cage beyond the laminated core, thus providing, in particular, better nozzle access. In particular, this allows the same clamping cage to be used for different stator lengths. The principle of radial clamping works for stators with a cylindrical outer surface (stators "without ears") and for stators with outer surfaces that deviate from a cylindrical shape (stators with ears, for example, for providing mounting receptacles). At least one rolling surface of the holder is designed as a recessed roller with a V-groove, which offers advantages in terms of minimal contamination. In other embodiments, the stator in the cage is not clamped radially over the outer surface, but axially over the laminated core end faces by slightly protruding elements in order to prevent the laminated core from fanning out during the gelling process, whereby this slight axial protrusion does not have a negative impact on the accessibility of the winding heads with the trickling nozzles. In some designs, the stator is clamped radially in the cage via frictional connection. In some designs, the stator is clamped axially in the cage via form fit. In some designs, the stator is clamped axially in the cage via frictional connection. In some designs, the axial clamping is done by means of screws. In some embodiments, the axial and / or radial clamping of the laminated core is carried out by means of a spring in order to compensate for different laminated core lengths and diameters and different thermal expansions during the process. In some embodiments, the cage is designed so that the stator can be inserted axially or radially without having to dismantle the elements that later clamp the stator axially / radially. The cage has at least one cylindrical surface on the outer diameter or on an externally accessible area for accommodating the gelling area – a rolling surface. This surface can also be conical or spherical. This surface can also have a toothing or other profile, which, in conjunction with a corresponding mating component, allows for concentric rotation around the longitudinal axis. In some embodiments, cylindrical or substantially cylindrical surfaces (rolling surfaces) are provided in the front and rear regions, enabling support across multiple regions. These support surfaces (rolling surfaces) preferably have the same diameter. In some embodiments, the cage provides two conical outer surfaces for receiving, which are arranged in particular in a mirror image to enable receiving in at least two rollers with a V-groove. In some embodiments, the cage has suitable peripheral receptacles suitable for concentric rotation of the stator around the longitudinal axis with a corresponding counter element (roller, pinion, toothed shaft, etc.). In some embodiments, the ends of the cage are designed in such a way that a radially inwardly directed overlap of both end faces of the stator laminated core preferably occurs over the entire circumference, and thus the outer region or the outer annular surface of the stator laminated core end faces are covered and protected from contamination. In some embodiments, the cage has a radial enlargement at its axial ends in order to deliberately allow any resin that runs out of the stator during trickling to drip downwards in a specific area, preferably in an area in which there is no critical mechanism of the system in the gelling or trickling area that could be contaminated by the dripping. In some embodiments, the stator is inserted into the cage axially. During the joining process, the cage is opened axially by an actuator. The stator is inserted into the cage at a specific angular position, then rotated by a specific angle. The cage is then closed axially. The stator is clamped longitudinally in this angular position by temporarily overlapping tabs on the cage and temporarily projecting elements on the laminated core. This force-actuated opening of the cage can also be achieved by the stator and / or a gripper directly during threading into the cage. In some embodiments, the cage is designed so that the stator can be axially inserted into the assembled stator at a specific angular position. By changing the angular position around the longitudinal axis between the stator and cage, the stator is positively secured in both axial directions by locally radially projecting elements of the cage (bayonet lock). Ideally, this fixation is additionally frictionally secured by bracing the cage, preferably via a spring. In some embodiments, the cage is designed in such a way that when the stator is inserted into the cage, the cage is simultaneously opened axially, and after a rotation of the stator about the longitudinal axis of the cage or a rotation of the cage about the longitudinal axis of the stator, the cage is then clamped axially between locally projecting elements on the stator laminated core. In some embodiments, the cage is made up of several parts, for example if it is a stator core with a cylindrical outer surface, or has other features of higher priority such as: • the end faces on the laminated core are temporarily covered as far as possible by the cage or elements on the cage to prevent contamination of this outer end face area on the laminated core and to enable reliable sealing of subsequent add-on elements or clean screw-on surfaces. • This temporarily axially applied protective element on the cage to protect against contamination can be designed so that, when a stator is running out of power, the cage's rolling surfaces and the associated rolling counterparts in the gelling area are not contaminated by the resin, but are instead redirected downwards into a drip tray, for example. This can be achieved, for example, with targeted drip edges on this protective element. In some embodiments, the cage is designed to accommodate stators of different lengths. This is achieved, in particular, by radial clamping (without axial clamping) or, in the case of axial clamping, by adjusting the cage length using spring preload and longitudinal guides. In some embodiments, the cage is designed so that a stator can be axially inserted and fixed by pivoting or removing temporarily inwardly projecting elements at the axial end of the cage. In some embodiments, the holder has features for directly gripping the holder, which is particularly designed as a cage, using a gripper for loading and unloading the gelling station. Thus, the stator does not necessarily have to be gripped using an internal gripper for repositioning (which entails the risk / disadvantage of contamination of the gripper jaws). For example, a counterpart complementary to a gripper can be provided on the holder, or projections and / or recesses can be provided, onto which a gripper can engage with a positive and / or frictional fit to grip the holder together with the stator. In some embodiments, the holder, which is particularly designed as a cage, is designed in such a way that it can be placed in another device in a rotating manner without positional orientation. In preferred embodiments, the holder, which is preferably designed as a cage, is also used for storage in the drip area. In some embodiments, the stator and / or cage are not picked up by the same rotating device during gelling and trickling, but are moved by a handling unit between trickling and gelling. In some embodiments, features of the holder, which is preferably designed as a cage, are also used in the trickling area - in particular its rolling surface(s) to guide this or the stator over to rotate the same or another guide device about the longitudinal axis, whereby the bearing elements of the guide device in the trickling area do not rotate concentrically around the stator. In some embodiments, the holder, which is particularly designed as a cage, is essentially rotationally symmetrical. In some embodiments, the stator is fixed essentially concentrically in the holder, which is designed in particular as a cage. In some embodiments, the holder, which is designed in particular as a cage, is designed to accommodate a stator which is substantially not round on the outer diameter and is therefore not suitable for rotating it concentrically about the longitudinal axis directly via suitable elements. In some embodiments, the holder, which is particularly designed as a cage, is configured such that it can accommodate segmented radial projections from the stator laminated core, and the stator is clamped on the laminated core via these regional radial projections. These radial projections on the stator laminated core are usually fastening tabs of the stator, with which the stator is later mounted in a housing. In some embodiments, the holder is configured to clamp the stator axially in the holder, in particular the cage, using these fastening tabs or segment-shaped radial elevations. For example, these tabs extend continuously over the entire axial length of the stator laminated core; for such a case, some embodiments provide for the cage to extend slightly over the axial ends of the laminated core for axial clamping via these tabs. In some embodiments, the holder, which is particularly designed as a cage, is designed in such a way that it can be gripped in a rotating manner via a gripping device and can be transported from the dripping station to the gelling station without interrupting the rotation. In some embodiments, the cage is only temporarily fixed to the stator for dripping and subsequent gelling / curing of the stator. Preferably, the stator is driven in rotation centrally to the longitudinal axis via the cage and held in position at least during the gelling process. In preferred embodiments, in the gelling area of ​​a trickling system - in the gelling device - a rolling device is provided as a receptacle for the holder, on which the holder can be placed with its rolling surface. In preferred embodiments, this receptacle in the gelling device, which is designed as a rolling device, has one or more of the features or improvements explained below. In some embodiments, the holder, which is particularly designed as a cage, is held by four rollers located in the rear and front areas, two each between 3 and 6 o'clock, and two between 6 o'clock and 9 o'clock. In some embodiments, at least one of these rollers has a flange, i.e. an increase in diameter on one side to enable axial positioning of the rotating holder / cage. In some embodiments, a running surface of the holder (in particular the cage) is designed for receiving in a roller, for example with a V-groove, for precise axial positioning. In some embodiments, if several rollers are arranged longitudinally, these are ideally located one behind the other in order to be accommodated by a common shaft. In some designs, the rollers arranged one behind the other have the same diameter, so these rollers can be connected to a rigid shaft. In some designs, all guide rollers are actively driven to prevent rotation from stopping if, for example, a roller is stiff. In some embodiments, the shafts, each of which has at least two rollers for holding the stator, are driven together and connected to each other, for example, via a chain. In some versions, the shafts with bearings and pinions are designed so that they can be quickly removed for cleaning. In some embodiments, the shafts with bearings are designed by means of deflector discs in such a way that a running out stator can only run out via the shafts and not via the bearing, by the bearing being axially offset to the front and rear. In some designs, the shafts with guide rollers are located above the stator center (stator axis), and the stator is held from above by magnetic force (magnetic rollers), thus preventing contamination of the bearings. In some designs, there are guide plates on the front of the cage which guide the resin away from the roller holder in the event of a malfunction. Instead of or in addition to the gelling area, the described holder designed as a rolling device can also be used for the trickling area - in the trickling device - since the rollers / holders and shafts are always located below the center point and in radius always further away than the largest radius in the winding head and therefore do not collide with the trickling nozzles. In preferred embodiments, it can thus be avoided that the stator does not have to be gripped in the inner diameter during trickling, transferring and gelling, and thus no clamping jaws become dirty, and no undesirable deposits / resin accumulations occur on the inner diameter due to the clamping jaws. Preferred embodiments also relate to a rolling device for a system component of a trickling system, which is designed in such a way that it can receive a preferably substantially rotationally symmetrical holder - in particular designed as a cage - with a substantially concentrically clamped stator, wherein the cage is located on the outer circumference of the stator laminated core and this cage is not or only slightly axially longer than the stator laminated core, and can rotate it symmetrically about the longitudinal axis, and at the same time only locally has a larger radius around the axis of rotation than the cage or the stator itself. In some embodiments, this segment for receiving the holder, which is designed in particular as a cage, in the rolling device, which extends radially larger than the cage or the stator itself, does not rotate during rotation and is therefore located in the same place during rotation of the stator. In some embodiments, the rolling device has only one actuator for rotating the stator and no actuator for actively clamping or fixing the holder / cage or the stator. In some embodiments, the rolling device preferably has self-rotating or moving parts which can concentrically rotate and position a substantially rotationally symmetrical cage. In some embodiments, the rolling device is designed so that a rotationally symmetrical cage can be transferred without positional orientation, and, for example, no gearing, etc., needs to mesh precisely during pickup. Advantageously, claw couplings, three-jaw chucks, etc., which require corresponding positional orientation, are also not provided. In some embodiments of the rolling device, these rollers have a cylindrical, spherical, or conical outer surface. In some designs, these rollers have a specific contour which, in conjunction with a corresponding negative contour in the cage, enables concentric rotation around the longitudinal axis (pinion, gearing, belt). In some embodiments, these elements are preferably mounted in the lower half of the center of rotation in order to use the force of gravity to fix the cage on the rollers. In some embodiments, the elements can also be mounted above the center of rotation, and a connection to the elements can be made, for example, by means of a magnet. In some embodiments, the rolling device preferably receives the holder, which is designed in particular as a cage, via rollers, with two rollers being arranged in the left and two rollers in the right lower area, and each being seated on a common shaft. In some designs, the left and right shafts are driven by a common chain. In some embodiments, several shafts are driven via the chain to accommodate several holders, in particular designed as cages. In some embodiments, a shaft with at least one roller simultaneously guides / receives a holder arranged on the left and on the right, in particular in the form of a cage. In some embodiments, the rolling device is designed to accommodate multiple cages at the same time. In some embodiments, the rolling device is designed as a circulating system with a chain, in particular in such a way that the stator / holder (cage) can be placed in a rotating manner between the trickling and gelling stations in one area and can run back in a stationary position or not actively rotating in the other area. In some embodiments, the holder (cage) and the stator are rotated continuously around the longitudinal axis without interruption from the start of trickling until the end of gelling. In some embodiments, the system component is designed so that the stator / cage can be loaded purely radially. The stators can be loaded into the system component purely by movement transverse to the stator axis, in particular by being placed on a rolling device. Advantageously, the stator / cage does not have to be firmly clamped to the circulation system, but is transported via rotating rollers / rollers as already described. Preferably, the holder, which is designed in particular as a cage, can be lifted out from below with a liftable receptacle, preferably designed as a rolling device and more preferably consisting of rollers / rollers. In some embodiments, this liftable holder can be inserted between the rollers / rollers of a rolling device of a transport device or of another system component. In some embodiments, this liftable receptacle is designed to lift and place the holder, which is designed in particular as a cage, in a rotating or non-rotating manner. In some embodiments, the liftable support is associated with the trickling device. Preferably, the rotational axis of the holder / cage or stator on the liftable support is predominantly horizontal, with any desired slight inclination of the rollers / cages during trickling. Some embodiments also relate to a trickling system with an associated method, which comprises a trickling area arranged in a trickling device, a gelling area arranged in a gelling device, and a transport device. The trickling device is designed to trickle liquid resin onto the winding heads of a stator on both axial ends while the stator rotates about its own axis. In particular, the stator is not clamped at its inner diameter during the trickling process to prevent contamination of the jaws and resin accumulation in the inner diameter.In particular, the stator is transported via the transport device from the trickling area to the gelling area, wherein the stator rotates around its own axis without interruption during the transport from the trickling area to the gelling area, wherein the stator is further rotated around its axis in the gelling area until the resin has gelled, and wherein during the rotating gelling process in the gelling area another stator can already be trickled in the trickling area, wherein for each stator from "start trickling" to "end gelling" the rotation is never interrupted, and the trickling area and gelling area are located at different locations. The “end of gelling” is defined as the point at which the originally liquid resin has gelled or hardened sufficiently, or the viscosity has become so high that rotation around the longitudinal axis is no longer necessary for the further curing process. In the following, preferred features and advantages of the gelling region in some preferred embodiments are explained. In some embodiments, the gelling station is a convection oven. In some embodiments, the gelling station has an induction coil. In some embodiments, the gelling station is stationary, i.e. the stator is transported to the gelling station, and gelling is not carried out at the same location as the trickling. In some embodiments, the gelling station is designed as a continuous oven, and the stator is cycled through. In some embodiments, gelling or curing takes place via temperature. In some embodiments, gelling or curing takes place over time, e.g., with two-component resins. In some embodiments, the stator is not clamped across the inner diameter in the gelling area. In the following, some features and advantages of preferred embodiments of the trickling system according to preferred embodiments of the invention are explained in more detail. In some embodiments, the stator is further cured after gelling. In some embodiments, rotation is omitted in the curing area. In some embodiments, the trickle-coating system also includes the curing process via temperature. In some embodiments, the trickle-coating system also has an upstream preheating process—preheating device—for preheating the stators, with this preheating preferably occurring via convection or induction. In the following, some features and advantages of preferred embodiments of the transport device according to preferred embodiments of the invention are explained in more detail. In some embodiments, the transport device has a gripper with which the stator is gripped on the inside for transport. In some embodiments, the stator is not gripped on the inside for transport with a gripper, but rather on the outer surface. In some embodiments, the stator is not gripped directly for transport, but rather a temporarily mounted holder is gripped for transport, in particular the holder with the rolling surface and more particularly designed as a cage. In some embodiments, the gripper for transport is designed such that only the stator, or the arrangement of stator and cage, or just the cage alone can be gripped and transported. In some embodiments, the gripper for the stator is designed such that it can also remove the stator from the holder or cage; this preferably takes place after gelling or later, or also for inserting the stator into the holder orCage at least before trickling. In some embodiments, the gripper for inserting the stator into the holder, which is particularly designed as a cage, or for removing the stator from the holder, which is particularly designed as a cage, is designed such that the stator can be rotated relative to the cage (bayonet lock). In some embodiments, the gripper is designed such that a cage designed for radial clamping can be pushed axially over the stator as a holder. In some embodiments, the gripper or the gripping system can be moved via a robot or a linear gantry. In some embodiments, the transport device has a conveyor belt as a transport system, which transports the stator further in a rotating manner. In some embodiments, the conveyor belt has a temperature-resistant design. In particular, the conveyor belt is designed to convey the components directly through the furnace, e.g. with a chain.In some embodiments, the transport device is designed to transport the component by placing it on the outside of the conveyor belt on elements which can further rotate the component during transport, e.g. on rollers. In some embodiments, the stator is either guided and rotated directly on the conveyor belt via its cylindrical outer surface, or a cage mounted on the stator as a holder is guided and rotated indirectly via an outer surface on the conveyor belt. In some embodiments, the rotary movement is transferred directly to the component by rotating the support rollers. In some embodiments, the rotary movement is introduced into the component via a pinion mounted on the component and / or a further conveyor chain. In the following, preferred features and advantages of the trickling area or the trickling device in preferred embodiments of the invention are explained in more detail. In some embodiments, the stator is held directly on the outer surface or via the outer diameter of a workpiece holder mounted in advance, preferably in the form of a cage. In some embodiments, a holder for the stator in the trickling area is designed so that the stator can be held directly or a stator mounted beforehand in a cage can be held in such a way that the associated clamping mechanism or holding mechanism or even actuator does not rotate. In some embodiments, the stator is held in the trickling area via a cage mounted beforehand, which is not permanently connected to the holder for the stator in the trickling area. This allows the cage with the stator to be fed to the trickling area and removed, for example, for cleaning purposes. The cage or the parts that come into contact with the workpiece can be cleaned in a separate area parallel to the cycle time. In some embodiments, the stator in the trickling area can also be pivoted around the transverse axis in at least one direction or even in both directions.In some embodiments, the stator can be dripped on the inside and outside of both winding heads in the trickling area. In some embodiments, a drip nozzle and the associated axes (in the sense of movement actuators) are designed so that the nozzle can drip onto the winding heads on both sides of the stator. In some embodiments, all drip nozzles and the associated axes are designed so that all nozzles on both sides can drip onto the winding head. In some embodiments, the stator is held in the trickling area via the round outer diameter of the stator or via the outer diameter of the mounted cage. In some embodiments, a holder for the stator in the trickling area, particularly designed as a rolling device, is designed so that the cage in the trickling area is rolled onto rollers arranged below the center and rests on these rollers predominantly by gravity.In some embodiments, the mount is designed such that the cage is driven via the rollers on which the cage or stator rests. In some embodiments, the mount is designed such that the cage is rolled off onto rollers arranged above the center in the trickling area and is pressed against the rollers against gravity by an additional force, such as a magnet in the upper area. In some embodiments, the rotation of the stator is initiated when it trickles over the rollers. In some embodiments, the rotation of the stator is initiated via an additional drive element - in particular (endless) traction means such as a belt, chain, or rope - which wraps around the cage or stator on an outer surface at a certain angular range and thus transmits the necessary force for rotation via frictional or positive locking.In some embodiments, the stator is lifted from the transport system during dripping in order to provide a temporary collecting tray between the stator and the transport system for any dripping of the resin and thus to avoid contamination of the transport system. In the following, special features or advantages of the stator to be handled in preferred embodiments of the invention - in particular its possible designs - are explained in more detail. In some embodiments, the stator can be substantially round on the outer surface of the laminated core and is received directly via this outer diameter in the trickling area and / or gelling area. In some embodiments, the stator can have raised areas on the outer surface of the laminated core which are suitable for axial reception in a clamping cage in that the stator is clamped axially in the cage via these radially projecting areas, wherein the cage is further preferably designed such that in order to insert the stator into the cage, the latter only needs to be opened against a spring force. In some embodiments, the stator can be clamped radially in the holder or cage. In some embodiments, the stator can be clamped axially via the end faces in the holder or cage. With the help of some particularly preferred embodiments of the invention, it is possible to dispense with internal clamping and thus prevent unacceptable resin accumulations on the inner diameter. At the same time, cost-effective, large-volume plant technology is possible because the stator can be rearranged between the trickling and gelling stations, meaning that the next stator can be trickled while the first stator is still gelling. In addition, stators with different external designs can be produced in the same plant, and synchronization when moving the stator from the trickling to the gelling area is not necessary. A further advantage is the modular design due to the relocation of the stator, since a malfunction in a synchronized system (e.g. chain conveyor) leads directly to a failure of the entire plant, whereby a modular system can be used for transfer with a gripper to maintain reduced production.A further advantage of preferred embodiments of the invention is the cost-effective and robust bearing or support in the dripping and gelling areas. Preferred embodiments of the invention enable a robust, resin-resistant construction in the gelling area – where stator leakage is possible. In particular, the need for tightly toleranced guides and poorly sealed guides, such as longitudinal guides in three-jaw chucks, is avoided. Preferred embodiments also allow for the elimination of additional actuators. Replacing a three-jaw chuck permanently installed in a chain is time-consuming, as it is a heavy component that must first be cooled down, and is often mounted at great heights and difficult to access. In contrast, shafts on which the stator is placed and driven via a pinion, for example, can be replaced very quickly due to their low weight and the lack of actuators, if necessary even without cooling down the component. Embodiments of the invention are explained in more detail below with reference to the accompanying drawings, in which: Fig. 1 shows a section through a stator held on an internal clamping unit to explain trickle impregnation; Fig. 2 is an enlarged detail of Fig. 1; Fig. 3 is an axial plan view of a stator located in a trickling area of ​​a trickling system to illustrate the ideal positioning of trickling nozzles in one embodiment of a trickling impregnation method; Fig. 4 shows the section along the line AA of Fig. 4 to illustrate the ideal position of trickling nozzles; Fig. 5 is an enlarged detail of Fig. 4; Fig. 6 shows a section along an axial plane through a stator in a pivoted state in a trickling area in an embodiment of a method for trickling impregnation; Fig. 7 is a side view of the stator in the situation of Fig. 6; Fig. 8a, 8b views as in Fig. 6, wherein the trickling is shown with two trickling nozzles in both pivoting directions; Fig. 9 is a schematic front view as an overview of a preferred embodiment of a trickling system with several system components including a conveyor unit of a transport device designed as a circulating system; Fig. 10 is a plan view of the conveyor unit of the transport device of the trickling system from above in Fig. 9; Fig. 11 is a front view of the trickling system of Fig. 9, additionally showing an oven and different functional areas thereof; Fig. 12 is a side view from the right in Fig. 9 of a stator held in a holder according to a first embodiment and transported on the transport device, together with a rolling device of a system component on which the holder is placed; Fig. 13 is a front view of the arrangement shown in Fig. 12, seen from the left in Fig. 12; Fig. 14a-14c side views of an arrangement of two adjacent holders with stators on the rolling device according to Fig. 12 and 13 together with a rolling device designed as a lifting device of a further system component, in particular a trickling device, at different stages of lifting the holders with stators; Fig. 15a-15c the situations of Fig. 14a-14c in front view, each seen from the left in Fig. 14 to 14c; Fig. 16a-16c side views as in Fig. 14a-14c, wherein three stages following the situation of Fig. be are shown in a trickling of the stators, which are lifted out with the rolling device designed as a lifting device at a trickling area of ​​the trickling system and pivoted for trickling; Fig. 17 is a plan view of another embodiment of the conveyor unit of the transport device during four successive stages shown one below the other; Fig. 18 is a front view of a further embodiment of the trickling system with a further embodiment of the transport device; Fig. 19a-19f front views of a region of a further embodiment of the trickling system with a rolling device designed as a lifting device on the trickling region during six successive stages of the method; Fig. 20 shows detail XX from Fig. 19c; Fig. 21 a sectional view through a concrete embodiment of a trickling system; Fig. 22 is a plan view of the trickling system of Fig. 21; Fig. 23 is a perspective isometric view of the trickling system of Figs. 21 and 22; Fig. 24 is a perspective view of a first embodiment of a holder designed in particular as a cage; Fig. 25 is a schematic side view of the holder of Fig. 24 with clamped stator; Fig. 26 is a perspective view of a variant of the first embodiment of the holder; Fig. 27 is a schematic side view of the holder of Fig. 26 with clamped stator; Fig. 28 is a side view of a second embodiment of the holder; Fig. 29 is a perspective view of the holder of Fig. 28, Fig. 30 is a side view of the holder of Fig. 28, with a shorter stator clamped in place; Fig. 31 is a side view of the holder of Fig. 28, with a longer stator clamped therein; Fig. 32 is a perspective view of a holder according to another embodiment; Fig. 33a to 33c are views of an assembly of a stator in a holder according to one of the embodiments of Figs. 24 to 32; Fig. 34 is a perspective view of a currently preferred further embodiment of the holder, wherein a stator clamped therein, for example, is indicated by dashed lines; Fig. 35 is a side view of the holder of Fig. 34 with indicated stator together with a matching embodiment of the rolling device of one of the system components of the trickling system; Fig. 36a to 36d are perspective views of a further embodiment of a trickling system during different stages of the trickling impregnation process that can be carried out therewith; Fig. 37 is a perspective view of an example of a rolling device of a system component of the trickling system of Figs. 36a-36d; Fig. 38 is a plan view of the rolling device of Fig. 37; and Fig. 39a and 39b Side views of the rolling device in different swivel positions. In the following, advantageous measures for trickle impregnation of stators 10 are first explained with reference to Figs. 1 to 8b. Fig. 1 shows a sectional view through a stator 10 clamped to an internal clamping unit 12. The stator 10 has a laminated core 14 with a series of inwardly opening slots 16 into which wires of a coil winding 18 are inserted. As can be seen in Fig. 2, which shows an enlarged detail of Fig. 1, the wires in the respective slot 16 are surrounded by insulation—e.g., insulating paper 20. When manufacturing stators 10, particularly stators 10 for a traction drive, it is also customary - see the literature references mentioned above - for a winding 18 of the stator 10 to be impregnated with a resin. Temperature-curing resins or two-component resins are common here. Polyester resins, polyesterimide resins, or epoxy resins are common. The resins can be applied to or into the winding 18 in the stator by dipping, rolling, or trickling. The stators 10 can be produced by a wide variety of winding processes; in particular, the winding 18 is a Flat wire winding, also called hairpin or wave winding, or a round wire winding, such as that commonly used in pull-in technology. Stators from 48V to over 1000V typically have additional insulation between the winding 18 and the laminated core 14, often in the form of insulation paper 20. In the case of internal rotor machines and their stators 10, in which the winding 18 is usually introduced with inwardly open slots 16, the trickling process has the significant advantage over the other processes that contamination of the outer diameter or the end faces can be avoided, and thus a complex subsequent cleaning of these surfaces can be dispensed with. Contamination of the outer diameter and the end faces 30 can be critical, as the outer diameter often serves as a functional surface. For example, the stator 10 is often shrunk into a housing during the further assembly process. Contamination of the end faces 30 is undesirable, as the stators 10 are usually screwed axially to a housing, or additional functional parts, such as elements for cooling the stator 10, are attached to these end faces 30. Thus, a contaminated surface can lead to malfunctions such as leaks. No layer build-up is desired on the inner diameter either, since the inner rotor in such internal rotors is often designed with a very small gap to the stator 10 in order to achieve the highest possible efficiency. If, as mentioned, contamination of the outer diameter, the inner diameter as well as the end faces 30 is undesirable, but resin impregnation of the winding 18 is nevertheless required, the trickle method has the aforementioned advantage over the other methods. For stators 10 with high efficiency and / or high power outputs and / or high vibrations during operation, the impregnation of the winding 18 is essential. During impregnation, the spaces in the slots 16, which are present between the winding 18, possibly slot insulation - e.g. insulation paper 20 - and the laminated core 14 due to the process, are filled with resin. This additional, often essential step improves, for example, the thermal conductivity between the winding 18 and the laminated core 14, thereby improving heat dissipation and thus making the unit more efficient. A further advantage of impregnation is the fixation of the winding 18 in order to prevent relative movement of the winding 18 to the laminated core 14 during vibrations and thus damage to the insulation of the winding 18. A further advantage is the additional insulation of the winding 18 by the resin, which allows higher voltages in the winding 18 and makes the unit more efficient. In general, it can be said that for electric drives or generators with high power and efficiency, impregnation of the winding 18 offers numerous advantages. Particular advantages arise when contamination of the inner and outer diameters, as well as the end faces of the laminated core 14, is avoided as much as possible. Fig. 3 and 4 show particularly suitable positions of trickling nozzles 22a-22d in a trickling impregnation according to advantageous embodiments of a trickling method and of a trickling device 24, which can be part of a trickling system 26. In the trickling process, the resin is usually dripped onto the protruding winding 18 and the resin runs, supported by the capillary action, into the slots 16 of the stator 10. At the same time, the stator 10 is continuously rotated about an axis of rotation which usually coincides with the stator axis (stator longitudinal axis, defines the later axis of rotation of the electrical machine provided with the stator). In the trickle-deposition process, prior to applying the resin, the stator 10 is typically heated to a temperature that is typically lower than the curing temperature of the resin, typically between 100-130°C, depending on the resin. In some embodiments, the impregnating resins used for the stators 10 have a significantly lower viscosity at slightly higher temperatures, thereby improving the capillary action of the resin during the trickle-deposition process. The maximum possible dosing speed depends on the stator design, i.e., only as much resin should be dosed as is drawn into the grooves 16 at that time due to capillary action. If the dosing quantity is too high, resin will also flow onto the end surfaces of the stator 10, which is undesirable. Therefore, such a trickling process can take several minutes, depending on the stator design and stator size. However, at the higher temperatures mentioned for the resulting improved capillary action, the resin begins to gel, i.e., harden, after a certain time, so the dripping process should not take too long. Therefore, resin is typically dosed onto the winding 18 at both ends of the winding 18, also called the winding head 28, using a dispensing needle—an example of a drip nozzle 22a-22d—so that resin can be drawn into the slots 16 from both sides of the stator 10 simultaneously. To reduce the process time, it can also be advantageous to apply the resin to the winding head 28 using multiple dispensing needles. However, with certain stator designs, such as those with inwardly closed slot insulation, simultaneous dripping from both sides of the stator can result in undesirable air pockets. In such cases, dripping from one side is preferable, especially in combination with a slight pivoting of the stator's 10 rotational axis relative to the horizontal to assist the resin's induction due to gravity. However, this pivoting of the stator 10 should only be done temporarily, as otherwise the resin will flow out of the groove 16 on the other side due to gravity. Afterwards, the rotational axis of the stator 10 should be returned to the horizontal position. Some exemplary pivoting positions of the stator 10 are shown in Figs. 6, 7, 8a, and 8b. For larger stators 10 - and thus a larger slot depth in the laminated core 14 - it is often advantageous that the resin is applied not only to the outer diameter at the winding head 28 near the laminated core 14, but also to the inside of the laminated core (see Fig. 4, 6, 7, 8a, 8b). This effect is particularly evident in stators with flat wire windings when the flat wire of the winding 18 fills the entire slot width, i.e. the flat wire is almost the same width as the slot, thus hindering resin flow transverse to the wire direction. It should be mentioned here that in stators 10 with high efficiency, the attempt is generally made to make the copper fill level in the slots 16 as high as possible. In windings 18 with round wire, there are sufficient cavities in the slot 16 for the resin to spread in all directions. In windings 18 with flat wire, where all flat wires are usually aligned axially and ideally fill the slot 16 completely in both width and height, in principle only tolerance-related gaps remain between the conductors and the area of ​​the corner radii of the conductors.In such stators 10, the resin can flow longitudinally into the interior of the stator 10 via the gap due to the conductor corner radii, but a transverse flow of the resin is severely restricted. Thus, it is often advantageous, especially for stators 10 with flat wire winding, to drip the material onto the outer diameter and the inner diameter on one side of the stator 10. This can be done, for example, by a first and a second drip nozzle 22a, 22b simultaneously, or by a single movable drip nozzle 22a that drips alternately onto the outer and inner diameter. Depending on the stator design, it may be advantageous to drip on both sides of the stator 10, both on the inner and outer diameter. When positioning the dispensing needle, care must be taken to ensure that the resin does not splash onto the face of the laminated core 14 during dispensing, which can occur, for example, due to small air pockets in the resin. Therefore, ideally, the dispensing needle should not be directed toward the laminated core 14, but rather as parallel as possible to the laminated core face 30, i.e., as radially as possible and thus perpendicular to the winding 18. In order to achieve the highest possible resin filling level without resin dripping from the winding head 28, the resin should be dosed as close as possible to the slot opening, ie at only a very short distance from the laminated core 14. Here, it proves advantageous if the resin, which is intended to fill the spaces between the winding 18 and the slot insulation - e.g., insulation paper 20 - is dripped directly in front of the slot insulation into the gap between the slot insulation and the winding 18, as shown in Fig. 5. In this case, the slot insulation, such as the slot insulation paper 20, usually protrudes between 1 mm and 7 mm above the end face 30 of the laminated core 14 in such stators 10. Ideally, the angle of the nozzle tip is adjusted depending on the winding head side in order to be able to drip onto these points, or - as shown in Fig. 6, 7, 8a and 8b and already described above - the stator 10 is temporarily tilted, which also causes the corresponding change in the angle between the drip nozzle 22a-22d and the end face 30 of the laminated core 14. Figs. 6 and 7 show the trickling with a first to fourth trickling nozzle 22a-22d in a first pivoted state. Figs. 8a and 8b show a further embodiment with only two trickling nozzles 22a, 22b, which can be moved to one or the other side of the stator 10, with the stator being pivoted in the first pivoting direction in Fig. 8a and in the second pivoting direction in Fig. 8b. In the following, preferred embodiments of a trickling system 26 are explained in more detail with reference to the illustration in Figs. 9 to 23 and 36a-39b. The resin in the stator 10 is gelled after trickling under continuous rotation (beginning of curing) and then completely cured, preferably via an oven 32. Gelling and / or curing can also be carried out by induction or infrared, etc. This can occur at the same location or through a relative movement of the trickling device 24 and the stator 10. For a cost-optimized system, it is advantageous if the trickling area 34, the quenching area 36, ​​and the curing area 38 are 100% utilized and do not block each other. Therefore, in dripping systems 26 for large quantities, it is desirable to design the stators / setting stations / dripping stations so that dripping and setting can occur simultaneously. This means that after dripping, the space is freed up for the next stator 10. This is achieved in particular by further transporting the stator 10, as this is more cost-effective than moving the dripping and setting stations. The transport between dripping and setting, which should take place as uninterrupted as possible, can be carried out via a transport device 40, which may have a conveyor belt 42 and / or a handling unit 44 - e.g., a robot arm 46. In particularly preferred embodiments, clamping of the stator 10 at the inner diameter is avoided during gelling. Avoiding clamping at the inner diameter is particularly advantageous because, due to capillary action, resin accumulates and gels again, thus leaving unwanted resin residues on the inner diameter. At the same time, the jaws also become dirty, requiring cleaning. Especially when using an oven for gelling, cleaning or replacing at these high temperatures of up to 200°C is critical and time-consuming. Therefore, clamping the stator 10 from the outside during gelling is very advantageous. In preferred embodiments, a holder 48 designed to be robust against heat influences is provided as a clamping device at the gelling / curing station. Due to the effects of temperature, distortions can arise due to different thermal expansion coefficients. Furthermore, preferred maintenance-free lubrication is difficult at gelling temperatures up to 200°C. The trickling system 26 and the holders 48 used therein are designed such that occasional leakage of resin from the stator 10 in the event of malfunctions does not impair the functionality of the respective system components. An unforeseen leakage is therefore critical, since the resin itself has a very strong capillary action and penetrates every gap (e.g., sealing rings, bearings). At the process temperatures, it subsequently hardens and could lead to the functional failure of the component. In preferred embodiments, therefore, as little actuator as possible is used in this area, and guides are mounted in such a way that they cannot be contaminated with resin by a leaking stator 10. In preferred embodiments, the stators 10 can be positioned in a rotating position at the gelling station without additional actuators for clamping. No actuator for rotating or clamping is placed directly in the hot area, thus saving the costs of temperature-resistant actuator measures. Regarding the stators 10 to be drip-coated, it should be noted that stators 10 that do not have a cylindrical outer surface are increasingly being used. This means that smaller non-cylindrical elements (weld seams, keyways) can be present, but larger non-cylindrical elements (cooling channels, mounting tabs, or the like) can also be present. Some embodiments of the holder 48 are designed such that even such stators 10 do not need to be clamped in a positionally oriented manner. In some embodiments, the stator 10 is stored or transported in a rotating state without interruption from the start of the dripping process until the end of the gelling process. In some embodiments, the stator 10 is not clamped internally to avoid resin residues on the inner diameter, at least during the gelling process. Some embodiments relate to a cost-effective, large-scale production system in which the stator 10 is additionally locally relocated from the dripping process to the gelling process without interrupting its rotation about its longitudinal axis. Special embodiments of the holder 48 are designed so that both winding heads 28 are accessible from the inside and outside during trickling. In some embodiments, a possible pivoting of the rotation axis by up to + / -15° is also advantageous. In some embodiments, the pivot angle can also be greater than + / -15°. In preferred embodiments of the holder 48, external clamping is provided, which is preferable for possible pivoting even during trickling. Preferably, however, the external clamping takes place essentially only in the area of ​​the laminated core 14. In preferred embodiments, a clamping unit / the holder 48 does not protrude, or only slightly, in both axial directions beyond the ends of the end faces 30 of the laminated core 14, thereby continuing to ensure very good access for the trickling nozzles 22a-22d to the winding heads 28. In some embodiments, an almost radially aligned trickling nozzle 22a-22d is provided, which protrudes only slightly beyond the Axially projecting slot insulation papers 20 are provided on the laminated core 14 to prevent the resin from splashing onto the end face 30 of the laminated core 14. In some embodiments, this is also possible with a stator 10 that also has local elevations on the outer diameter (e.g., mounting tabs). In some embodiments, the method / device or trickling system is independent of the outer contour of the stator 10, allowing stators 10 with different outer contours to be produced using the same system. For a space-saving system, the trickling system 26 and / or its system components are ideally designed so that the stators 10 can be arranged close to one another. A first exemplary embodiment of a trickling system 26 is shown schematically in Fig. 9 without oven 32, in Fig. 11 with oven 32, and in Figs. 21-23 in more detail in a possible detailed embodiment. The trickling system 26 has, as system components, a trickling device 24 with a trickling area 34, a gelling device 50 with a first gelling area 36a and a second gelling area 36b, a curing device 52 with a curing area 38, and a transport device 40. Furthermore, a series of holders 48 are provided, each of which is designed to hold a stator 10. The trickling system 26 further has a loading and unloading station or a loading and unloading point 55 (station for loading and unloading). The respective holder 48, which is shown schematically in Figs. 12-16c and in Figs. 21 to 23, and in greater detail in concrete possible embodiments in Figs. 24 to 39b, is designed to hold, rotate, and transport a stator 10 during the resin impregnation of the stator 10. The holder 48 has a clamping device 56 for clamping the stator 10 and at least one rolling surface 58a, 58b for rollingly supporting the rotating holder 48 with the clamped stator 10. The holder 48 with clamped stator 10 is held in the gelling device 50 for gelling solely by gravity in that the at least one rolling surface 58a, 58b is placed on a rolling device 60 of the gelling device 50, shown in Figs. 12 and 13 and as a variant in Fig. 35. With the at least one rolling surface 58a, 58b resting on the rolling device 60, the holder 48 with stator 10 is rotated in the gelling region 36a, 36b about the axis of rotation coinciding with a central axis of the stator. In the trickling device 24, the holder 48 with the clamped stator 10 for trickling impregnation is also held solely by gravity by resting the at least one rolling surface 58a, 58b on a rolling device 62 of the trickling device 24 shown in Figs. 14a-14c-16c and rotated about the axis of rotation coinciding with the central axis of the stator 10. The respective rolling device 60, 62 has a plurality of guide elements 64 on which the at least one rolling surface 58a, 58b is deposited. The guide elements 64 are configured to guide the holder 48 such that it executes a concentric rotation about its central axis / longitudinal axis. In some embodiments, the guide elements 64 are configured for lateral guidance such that the holder 48 maintains its axial position (position in the axial direction, ie in the direction of the stator axis / central axis) even when rotating. The guide elements 64 of the respective rolling device 60, 62 are each designed to complement the configuration of the at least one rolling surface 58a, 58b. Examples of the guide elements 64 are rollers 66, pinions, contoured wheels, gears, rails 68, (revolving) chains, such as conveyor chains 70 or similar traction means, in particular endless traction means, running surfaces 72, rollers 66 with flanged wheels 74, rollers with V-grooves, rollers with a spherical running surface, rollers 66 with an annular projection 76 on the running surface, rollers with grooves on the running surface, rollers connected by a chain, such as in particular a conveyor chain 70 or similar traction means or a conveyor belt 42, actively driven rollers, actively driven pinions, and rollers, pinions, or contoured wheels connected by a common shaft 80. In the following, the transport device 40 of the trickling system 26 according to the first embodiment is explained in more detail with reference to the illustration in Figs. 9 to 13. The transport device 40 is designed as a circulating system. The transport device 40 provides the rolling device 60, on which the stators 10 held in the respective holders 48 are supported at the loading and unloading station 55 by means of at least one rolling surface 58a, 58b, purely by gravity. Due to its circulating configuration, the rolling device 60 is also provided in the gelling device 50 and the curing device 52. To form the rolling device 60, the transport device 40 has a conveyor belt 42, in particular in the form of at least one circulating transport chain 70, with rollers 66 extending with their rotational axis transverse to the conveying direction, as well as rails 68 or other running surfaces 72. The rollers 66 are provided with measures for positioning and guiding the holders 48 in the transverse direction, e.g., flanged wheels 74 (see Fig. 12) or annular projections 76 (see Fig. 35) or the like. A first run of the conveyor belt 42 runs in an upper region of the trickling system 26, where, viewed in the conveying direction, there is first the loading and unloading point 55, then the trickling device 24 and then the first gelling region 36a and then the second gelling region of the gelling device 50. In this upper region, the at least one rolling surface 58a, 58b of the holder 48 rests on two shafts 80 with rollers 66 that are adjacent in the conveying direction for transport, as shown in Figs. 9 to 13. Then, the conveyor belt 42 is deflected, and a second run of the conveyor belt 42 is located in a lower region of the trickling system 26 above the stators 10 until the conveyor belt 42 is deflected upwards again at the other end. At the deflection regions and in the lower region, the rails 68 or the other running surface 72 are provided, on which the at least one rolling surface 58a, 58b rests, so that the stators 10 are guided in their holders 48 through the curing device 52 formed in the lower region and then again upwards to the loading and unloading point. 55. The rollers 66 of the conveyor belt 42 engage the top of the holder 48 and thus drive the movement. The first embodiment of the trickling system 26, shown in Figs. 9 to 23, with its various system components, is designed as a circulation system, preferably configured as a chain circulation system. The circulation system is divided into the individual application steps of loading / unloading, trickling, and gelling, which can occur simultaneously. Accordingly, in preferred variants of the first embodiment of the trickling system 26, the transport device 40 has a circulating transport path 142 with a feed area 144 and a return area 146 as well as deflection areas 148, 150 therebetween and the conveyor belt 42. The conveyor belt 42 is designed so that the stators 10 can be placed or lifted off the conveyor belt 42 transversely to the respective stator axis and rest on the conveyor belt 42 in a rotating manner, at least in sections, during transport through the forward region 144 or return region 146. In some embodiments, the conveyor belt 42 is arranged in the advance region 144 below the stator axes of the stators 10 located in the advance region 144 during operation, so that the stators 10 can be transported through the advance region 144 of the transport path 142 while resting on the conveyor belt 42. In some embodiments, the transport device 40 has the running surface 72 in the return region 146 for supporting the stators 10 to be transported through the return region 146. For example, the running surface 72 is formed on rails 68 or other guide elements 64. In some embodiments, the conveyor belt 42 is arranged in the return region 146 above the stators 10 located in the return region 146 during operation and is configured to drive the movement of the stators 10 rolling on the running surface 72. In the illustrated embodiments, the loading and unloading point 55 is arranged at a beginning of the advance area 144 of the circulating transport track 142 and is designed such that the stators 10 can be placed on the conveyor belt 42 and lifted off therefrom transversely to the stator axis. In the illustrated embodiments, the deflection regions 148, 150 have deflection curves 152 for detecting the stators 10 and deflecting their movement paths. In some embodiments, the regions 34, 36a, 36b, 38, 55 of the impregnation system 26 are arranged on multiple levels 154, 156. For example, the impregnation region 34 and a gelling region 36a, 36b are provided on a first level 154, preferably an upper level, while a curing region 38 is provided on a second level 156, preferably a lower level. In particular, it is provided that the feed region 144 and the return region 146 are arranged one above the other. Preferably, the feed region 144 is arranged above the return region 146. In the illustrated embodiments of the first exemplary embodiment of the trickling system 26, the advance section 144 of the transport track 142 leads through the impregnation section 34 and the gelling section 36a, 36b of the impregnation system 26, wherein a rotary drive gear 158 is provided in the impregnation section 34 and the gelling section 36a, 36b for driving a rotary movement of the stators 10 lying on the conveyor belt 42. For example, the rotary drive gear 158 has a drive chain 86, 86a, 86b, 86c for driving a rotation of the stators 10, hereinafter also referred to as a rotary chain. In the illustrated embodiments, the return region 146 and / or at least one or both of the deflection regions 148, 150 lead through the curing region 38 of the impregnation system 26, which is located downstream of the gelling region 36a, 36b in the transport direction. In the illustrated embodiments, the conveyor belt 42 further comprises at least one revolving traction means—such as, in particular, the transport chain 70—as well as rollers 66 or cylinders 82 attached thereto for rolling support of the stators 10. The rollers 66 or cylinders 82 are rotatable about axes of rotation extending transversely to the transport direction. As already mentioned, several holders 48 with stators 10, particularly designed as cages, can be located in the circulation system for each work step to achieve high utilization. For example, a batch 54 of several holders 48 with stators 10 is located in each of the system components; in the example, a batch 54 of four holders 48 is shown. Fig. 9 schematically illustrates the basic concept of the trickling system 26. The stators / cages / holders 10, 48 are loaded radially from above and then rest on the shafts 80 of the conveyor chain 70 purely by gravity. The shafts 80 are preferably mounted between two conveyor chains 70, as shown in Fig. 10, thereby achieving a relatively simple and cost-effective construction. Depending on requirements, it is also possible to equip the circulation system with more than just one setting station—here, a first and second setting area 36a, 36b are indicated—and to construct the trickling system 26 in a modular manner. Fig. 10 shows the trickling system 26 together with the oven 32, which extends over the setting device 50 and the curing device 52. To prevent the resin from leaking from the stators 10, the drip system 26 is designed to rotate during dripping and gelling. An exemplary embodiment of a rotary drive for driving such rotation is explained below with reference to the illustration in Figs. 9, 12, and 13. The shafts 80 serving as take-up rollers 82 are preferably designed with a pinion 84 or the like. This allows for the use of only one drive and one drive chain 86 or Likewise, each holder 48 / stator 10 in this area can be permanently set in rotation. The drive chain 86 for the rotation is driven independently of the transport chain 70. The independence of the (rotational) drive chain 86 from the transport chain 70 ensures that the rotation is maintained during further transport from, for example, drops to gels, or when the transport chain 70 is at a standstill, as shown in Fig. 13. To achieve a smaller footprint for the entire trickling system 26, some embodiments (not shown) provide for the gelling process to be carried out on the upper and lower levels, or only on the lower level. For this purpose, the drive chain 86, similar to the revolving conveyor chain 70, can be guided over both levels 154, 156 as well as around the stators 10 in the guide rail - running surface 72 - of the first deflection area 148. An exemplary embodiment and the function of the rolling device 62 of the trickling device 24, embodied here as a lifting device 88, are described below with reference to Figs. 14a to 16c. Figs. 14a, 15a show different views of a first stage of lifting; Figs. 14b, 15b show different views of a second stage of lifting; Figs. 14c, 15c show different stages of a third stage of lifting; and Figs. 16a to 16c show different stages of pivoting of the lifting device 88. For a trickling system 26, which is designed for n stators 10 per batch 54, the rolling device 62 designed as a lifting device 88 has n+1 lifting shafts 90. The lifting shafts 90 are mounted on a support (not shown) that can be driven for rotation at a predetermined distance from one another in the conveying direction. The support can be moved horizontally and vertically transversely to the conveying direction in the trickling device 24 and can be pivoted in different pivoting directions. The predetermined distance is dimensioned such that, on a lifting shaft 90 provided between adjacent receiving locations for the stators 10 / holders 48, both adjacent stators 10 / holders 48 can roll on the same lifting shaft 90 arranged between them. Furthermore, the trickling device 24 has a trickling nozzle arrangement 92 which is movable horizontally transversely to the conveying direction, for example on a portal system. As already mentioned, it is advantageous for a better trickling result if the trickling nozzles 22a-22d apply the resin to the winding head 28 from both sides of the stator 10, in the inner and / or outer diameter and / or with a slight inclination to the horizontal longitudinal axis. The compact design of the circulation system makes it possible to position the trickling nozzles 22a-22d, for example, from one or both sides, and even in a portal design above the holders 48. Furthermore, the holder 48, which is designed in particular as a cage, allows for easy accessibility of the stator 10, allowing, for example, only one trickling nozzle 22a-22d to be used for the inner and outer diameters per stator side, or even separate trickling nozzles 22a-22d for the inner and outer diameters per stator side. Several variants are also conceivable for lifting and thus pivoting the stator 10. In the illustrated embodiment, the holders 48, which are particularly designed as cages, can be lifted upwards by means of the lifting shafts 90, which are advanced in the axial direction between the receiving rollers 82. The holders 48 are also held in position on these lifting shafts 90 by gravity and any profiles / V-grooves / flanges (not shown here; see, for example, Fig. 35 for a possible design of the lifting shafts 90). By driving the lifting shafts 90 separately, it is possible to pick up the holders 48 in an upright or rotating position and also to set them down again in an upright or rotating position - see Fig. 14a-c and 15a-c. Fig. 15a-15c also shows that the lifting device 88 uses only one lifting shaft 90 between the holders 48 and not two, unlike the transport chain 70. The advantage of this is that on the lifting device 88, for example, only the first lifting shaft 90 needs to be driven in order to set all other lifting shafts 90 and holders 48 in rotation, without connecting these lifting shafts 90 with a chain, for example. This principle is also conceivable for the transport chain 70 if the take-up rollers 82 or rollers 66 are correspondingly large in diameter, so that the holders 48 are not connected to one another at their outer diameter. As shown in Fig. 16a-16c, where the pivoting of the stator 10 / holder 48 with possible delivery of the trickling nozzles 22a, 22b is shown, the lifting device 88 is provided in some embodiments with a pivoting device 94, which preferably tilts the respective stator 10 around its center of gravity. For cases in which the stators 10 do not need to be pivoted for trickling, the trickling system 26 is also designed without a lifting device 88 in some embodiments. Particularly preferred embodiments for this variant of the first embodiment of the trickling system 26 are shown in Figs. 17 and 18. These embodiments address the problem that the not yet rotating stators 10 at the loading and unloading point 55 are accelerated one after the other during the further cycling for trickling. The same applies if the drive chain 86 for rotation is pulled through from the loading and unloading point 55 until gelling, since the non-rotating stators 10 are transported from the lower level via the second circulation area 150 upwards to the loading and unloading point 55. In some embodiments, an example of which is shown in Fig. 17, it is therefore provided that the (rotational) drive chain 86, 86a, 86b, 86c between the loading and unloading point 55 and the trickling area is, for example, equipped with multiple tracks, and the take-up rollers 82, 82a, 82b have several pinions 84, 84a, 84b, 84c that alternately engage per batch 54. A separate drive is provided for each track. In particular, a first to third drive chain 86a-86c is provided. A first and a second drive chain 86a are provided in parallel at the loading and unloading point 55 and each equipped with its own drive. In a transfer area 96, the driven third drive chain 86c parallel to the first and second drive chains 86a, 86b and then runs alone to the trickling-gelling area. The pickup rollers 82 of the conveyor belt 42 have first pickup rollers 82a and second pickup rollers 82b. For each batch 54, either the first pickup rollers 82a or the second pickup rollers 82b are provided; in other words, a group of first pickup rollers 82a, designed to receive one batch 54, follows a group of second pickup rollers 82b, designed to receive a subsequent batch 54, and then another group of first pickup rollers 82a, etc. The first pickup rollers 82a have a first pinion 84a positioned in the direction transverse to the conveying direction for engagement with the first drive chain 86a and a third pinion 84c positioned for engagement with the third drive chain 86c. The second pickup rollers 82b have a second pinion 84b positioned to engage the second drive chain 86b and the third pinion 84c positioned to engage the third drive chain 86c. Fig. 17 shows four successive situations during the conveying of the four batches 54 shown in the upper level in Fig. 9, wherein only one of each group of take-up rollers 82a, 82b provided for the respective batch 54 is shown. According to the illustration shown at the very top of Fig. 17, a first batch of holders 48 with stators (not shown in Fig. 17, the first batch has, for example, four stators 10 in corresponding holders 48) is first placed on first take-up rollers 82a. These are engaged with the first drive chain 86a via the first pinion 84a. The first drive chain 86a is driven in order to start and accelerate the rotation of the stators 10 of the first batch. This batch is then cycled further and the rotating stators 10 of the first batch are transferred to the third drive chain 86b, which further drives the rotation via the third pinion 84c.While the first take-up rollers 82a of the first batch are still at the loading and unloading point 55, second take-up rollers 82b are already being advanced for receiving a subsequent second batch. However, they are not engaged with the first drive chain 82a, but only with the second drive chain 86b, which is not yet driven. The second batch is then placed on the advanced group of second take-up rollers 82b. As shown in the second row of Fig. 17, the second drive chain 86b is then driven to set the second take-up rollers 82b and thus the stators 12 of the second batch in rotation and to continue cyclical rotation, while the first take-up rollers for a third batch are already being advanced without a rotary drive. The third row of Fig. 17 shows the acceleration of the third batch on the first take-up rollers 82a, and the fourth row of Fig.17 shows the acceleration of the fourth batch on second take-up rollers 82b. If there is an even number of batches 54 in the system, as shown in Fig. 9, it is possible to use alternating pinions 84a, 84b and a total of three drives - first to third drive chain 86a, 86b, 86c - to circumvent the problem of uneven acceleration. For an odd number of batches, the number of pinions and drives is increased accordingly. After the stators 10 have been placed on the loading and unloading station 55, in some embodiments, an example of which is shown in Fig. 18, two drive chains 86a, 86c are used, one 86a for the loading and unloading station 55 and one 86c for the trickling / gelling area, each with a drive, and the take-up roller 82 with a total of two pinions 84a, 84c. Mechanically, the system can be constructed in such a way (e.g., by chain wheel position, chain pitch, key connections, etc.) that the chain links are exactly aligned with one another in a transfer area 96. In combination with rotary encoders that query the position of the drive and thus of the chain wheel, the drive chains 86a, 86c can then be brought to the same speed and synchronized, so that only the pinions 84a, 84c are changed during further cycling. In the event that finished stators 10 are already being conveyed upwards from the lower level 156 to the loading and unloading station 55, the drive chain 86a is pivotable in some embodiments, one example of which is also shown in Fig. 18. If the holders 48 at the loading and unloading station 55 are running at the same speed as at the trickling and gelling station and if the trickling process is complete, the holders 48 are transported further. Depending on the progress of the holders 48, the first drive chain 86a at the loading station 55 is pivoted downwards so that the pinions of the subsequent take-up rollers 82 do not engage, but the holders 48 that have not yet been fully transported continue to rotate. The following again deals with the variant of the first embodiment of the trickling system 26 with lifting device 88 according to Fig. 14a-16c. A major advantage when the stators 10 are lifted out during trickling is that the components 80, 82, 84, 86 of the rotary drive can be designed cost-effectively, since the sometimes heavy stators 10 do not have to be set in rotation from a standstill, but are placed in a rotating state by the lifting device 88 - see Fig. 14a-15c - or pivoting device 94 - see Fig. 16a-16c - onto the rotating take-up rollers 82 of the conveyor belt 42. This makes the components smaller and reduces wear in the system. Furthermore, the unit that serves to drive the rotation of the holders 48, preferably a chain system - e.g. drive chain 86 - can be built with only one drive.If the trickling system 26 is completely empty and the first batch 54 of stators 10 is loaded, the drive chain 86 remains stationary and the batch 54 can be transported further for trickling. The lifting device 88 then sets the stators 10 in rotation, released from the transport device 40. Before the stators 10 are then set down again in rotation, the drive chain 86 starts. In some embodiments, examples of which are shown in Figs. 19a-19f and 20, the unit for driving the rotation is constructed such that the drive chain 86 is preferably deflected in a driver 98. The driver 98 is displaceable along the conveying direction between the positions shown in Figs. 19d and 19e, before and after the point for lifting on the trickling device 24. In some embodiments, a separate drive can be provided for displacement. In the embodiment shown, the carrier can be connected to the transport chain 70, as shown in Fig. 20. Fig. 19a shows the situation after the batch 54 has been transported from the loading and unloading point 55 to the trickling device 24. Fig. 19b shows the lifting of the batch 54 in the trickling device 24. Fig. 19c shows how the stators 10 of the lifted batch 54 are set in rotation. A second batch 54 is placed at the loading and unloading point 55. At the same time, the rotation of the drive chain 86 starts. Fig. 20 shows detail XX of Fig. 19c, where the connection between the driver 98 and the transport chain 70 is established. Fig. 19d shows the deposition of the first batch 54 on the conveyor chain 70 after trickling. The stators 10 continue to rotate in their holders 48. By connecting the carrier 98 to the transport chain 70, preferably by a pneumatic actuator 100 on the carrier 98, for example, the batch 54 can then be transported along the transport chain 70 from trickling to gelling, as shown in the transition from Fig. 19d to Fig. 19e. If the subsequent batch 54 is lifted out at the trickling station—this occurs shortly before the situation shown in Fig. 19f—the connection between the carrier 98 and the transport chain 70 is released. The carrier 98 is returned to its starting position by another actuator 102, for example, a pneumatic actuator. The drive chain 86 remains in constant motion. Figures 21 to 23 show a plan view, a sectional view and a perspective view (shown without the side furnace wall) of a concrete embodiment of the trickling system 26 according to the first embodiment with (chain) circulation system. Since the stators 10 are passed through a furnace system—furnace 32—to cure the liquid / resin, it should be noted that the higher temperature causes a corresponding linear expansion of the components. In addition, the transport system will exhibit a certain degree of wear after extended operation, and thus, in the example of the transport chain 70, an elongation of the chain links will occur. This causes the positions of the holders 48, e.g., the loading position and the trickling position, to shift. However, the maximum linear expansion and the elongation of the transport chain 70 can be calculated, and thus this shift can be counteracted. Preferably, the relative position of the batches 54 is sensed by sensors (not shown), and the holders 48 are then transported further or closer, or even in the opposite direction, by the transport system, and the offset is compensated accordingly. In addition, the holders 48 are placed with their at least one rolling surface 58a, 58b on rollers / rollers 82, 66, 90 and center themselves in the process, thus eliminating the need for additional indexing. In summary, due to the cylindrical shape of the holder 48 and the cylindrical shape of the lifting elements / depositing rollers 90, 82, 66, the holder 48 always rolls to the correct position, and Misalignments can always be compensated when picking up with a gripping system or when lifting for an application. In the following, exemplary embodiments of the holder 48 are explained in more detail with reference to the illustrations in Figs. 24 to 35. Although in embodiments not shown, holders 48 are provided with only one correspondingly longer cylindrical rolling surface, the illustrated holders 48 have a plurality of rolling surfaces 58a, 58b arranged at an axial distance from one another. In the illustrated embodiments, the rolling surfaces 58a, 58b surround the stator 10 radially further outward than the outer circumference of the stator 10—so that the stator 10 is surrounded by the holder 48 like a cage. The at least one rolling surface 58a, 58b is provided on an annular region of the holder 48. If there are multiple rolling surfaces 58a, 58b, the corresponding annular regions are formed by ring elements 104a, 104b of the holder 48, which are axially connected to one another by struts 106 extending in the axial direction. The struts 106 can be telescopic, in particular with springs 108 (Figs. 24-32), or solid. Depending on the design, the stator 10 can be clamped both axially and radially in the holder 48, which is particularly designed as a cage. Embodiments with an axially clamping clamping device 56a are shown in Figs. 24 to 32. An example of a currently preferred embodiment with a clamping device 56b that clamps radially on the outer circumference of the stator 10 is shown in Figs. 34 and 35. In preferred embodiments, the holder 48 is designed so that the stator 10 can be inserted without having to dismantle the elements which later clamp the stator 10. 24 to 27, during the axial clamping of a stator 10 which does not have a cylindrical outer surface, i.e. non-cylindrical elements which are usually used for screwing the finished stator 10 into a housing, the stator 10 is inserted into the holder 48 from above, for example, and either the holder 48 or the stator 10 itself is rotated about its longitudinal axis in order to obtain an overlap like a bayonet catch. As a result, the workpiece is held captively and with very low surface pressure in the holder 48. As can be seen by comparing Figs. 24 and 25 on the one hand and Figs. 26 and 27 on the other hand, holders 48 of different lengths with corresponding stroke, preferably by means of differently inserted springs 108, are used depending on the length of the laminated core 14. Fig. 28 to 31 show a further possibility of axially accommodating stators 10 of different lengths, which requires only one design of the holder 48. Here, it is provided that the bayonet lock for each stator 10 is designed in the opposite direction and thus one stator 10 is accommodated in the holder 48 rotated to the left (Fig. 30) and the other stator to the right (Fig. 31). According to Fig. 29, for this purpose, a common support 114 is provided on a first ring element 104a, and a bayonet lock that can be closed by turning to the right is provided on a second ring element 104b for a stator with short laminated core length (Fig. 30) and on a third ring element 104c a bayonet lock that can be closed by turning to the left for a stator with a long laminated core length (Fig. 31). Another solution for accommodating stators 10 with different lengths is to design the holder 48 as a telescope. Axial clamping of a stator with a cylindrical outer surface is possible, for example, with swivel clamps (not shown) mounted between the rings 104a, 104b of the holder 48. After the stator is inserted, grips pivot in and then clamp onto the end faces 30 of the laminated core 14. The grips can be moved either manually or automatically with the aid of an actuator. In some embodiments, an example of which is shown in Fig. 32, the cylindrical outer shape of the holder 48 also makes it possible to realize the necessary rotation for dripping and gelling directly via the holder 48 itself and not via the take-up shafts 80, 82, 82a, 82b of the conveyor chain 70. The previously described pinion(s) 84, 84a, 84b, 84c on the take-up rollers 82, 82a, 82b are mounted directly on the holder 48, and the take-up shafts 80, 82 serve only as rotating supports. Although only shown here for one of the embodiments of the holder 48, these pinions can be provided on the various configurations of the holder 48 - radially or axially clamping, with or without a bayonet lock, etc. Accordingly, several variants are also conceivable for accommodating stators 10 that are to be clamped radially, an example of which is shown in Figs. 34 and 35. Similar to the swing clamps, clamping elements 120 with pressure pieces / friction surfaces radially resting on the laminated core are mounted between the rings 104a, 104b of the holder 48. The pressure pieces can be advanced, for example, via a toggle lever, an eccentric clamp, or a screw / wedge gear 122, or can also be designed as a swing clamp. Radial clamping has the particular advantage that the holder 48, which is designed in particular as a cage, does not have any axial projection beyond the laminated core 14, thus providing better access for the trickling nozzles 22a-22d. Furthermore, the same holder 48 is suitable for clamping stators 10 of different lengths. Furthermore, radial clamping works both for stators with a cylindrical outer surface and for stators with radial projections. In Fig. 35, the holder 48 is shown resting on one of the rolling devices 60, 62. The rolling surfaces 58a, 58b on the rings 104a, 104b have a V-groove 124, into which complementary annular projections 76 on rollers 66 seated or formed on the shafts 80, 90 engage. This guidance has proven advantageous in terms of minimal susceptibility to contamination. Figures 33a to 33c show different stages of an example of an automatic insertion of a stator 10 into a holder 48. In some embodiments, an example of which is shown in these figures, it is possible to transport the stator 10 / holder 48 with a gripper 126. The gripper 126 is attached, for example, to a linear gantry or to a robot 128. For example, the Stator 10 is held by a mandrel 130 - with internal clamping unit 12 as shown in Fig. 1 - on the inner diameter, while the holder 48 is located on a support 132. In some embodiments, the gripper 126 is designed such that it can rotate the stator 10 relative to the holder 48 for insertion into the holder 48 or for removal, in order to thus connect the stator 10 and the holder 48 to one another by means of a bayonet 116, 118. In other embodiments not shown, the storage area 132 is designed to receive the stator 10, and an external gripper is provided on the robot 128 and is configured to receive the holder 48 by the outer contour, to slip it over the stator 10, and then to rotate the holder 48 relative to the stator 10 when receiving the stator 10. In further embodiments not shown, which cooperate in particular with the holder 48 according to Figs. 34 and 35, an actuator for actuating the clamping device 56b after insertion of the stator 10 is provided on the support 132 for the holder 48. As can be seen in particular from Fig. 33c, after the stator 10 has been clamped in the holder 48, the stator 10 and holder 48 are transported to the loading station 55 of the trickling system 26 via the same gripper 126, e.g., with an internal clamping mandrel, and placed thereon. After the stator 10 has been trickled and the resin has hardened, the gripper 126 can pick up the finished stator 10 and separate the holder 48 from the stator 10 again at the depositing station 132. Further exemplary embodiments of the trickling system 26 are explained in more detail below with reference to the illustrations in Figs. 36a to 39b. These exemplary embodiments do not have a circulation system as a transport device; rather, the transport device 40 essentially comprises the robot 128 with gripper 126. The rolling device 62 of the trickling device 24 is designed as shown in Figs. 37 to 39b. The design of the rolling device 60 of the gelling device 50 is shown in Figs. 36a to 36d, which illustrate different stages of the trickling process. The rolling devices 62, 60 each have rotatably driven shafts 80 on which the holder 48 with its at least one rolling surface 58a, 58b can be supported by gravity. For example, the respective shaft 80 can be designed as shown in Fig. 35. In the further exemplary embodiments shown, the stator 10 with holder 48 is not placed at a loading point 55, but is transported directly to the trickling station. The gripper 126 is equipped with an additional rotating unit 134, which allows it to pick up the holder 48 in a rotating manner after trickling and to place it again in a rotating manner at the setting station. Fig. 36a shows how the robot 128 loads the holder 48 for trickling. Fig. 36b shows how the holder 48 and the stator 10 rotate during the trickling process. Fig. 36c shows how the robot 128 lifts the holder 48 and the stator 10 from the trickling station in a rotating manner. And in the illustration of Fig. 36d, the robot 128 places the holder 48 with stator 10 in a rotating manner on the rolling device 60 of the gelling device 50, where it is further driven in rotation for gelling.Although the robot 128 is shown here with the inner clamping mandrel—inner clamping unit 12—it should be clear that the gripper 126 can also be configured to directly grip the holder 48. For example, the holder 48 can have gripping areas (not shown) on which the gripper 126 can engage. Accordingly, in some embodiments—as described above with reference to Figs. 9 to 23—it is provided that the receiving rollers 82, 82a, 82b are attached to a transport system, e.g., a transport chain 70, which is further cycled between applications—such as dripping, gelling, and curing. In other embodiments, examples of which are shown in Figs. 36a to 39b, the support rollers 82, on which the holder 48 is placed, are stationary, with the handling between dripping and gelling being implemented, for example, by means of a robot 128 or the like. The force required for rotation can also be applied to these stationary rolling devices 60, 62, which are located in the trickling area 34 and in the gelling area 36a / oven 32, as mentioned, either force-fitting (e.g. friction wheels, or friction wheel with belt, etc.) or form-fitting (e.g. chain with pinion, toothing via spur gears, etc.) directly into the holder 48 or via the support rollers 82. As can be seen from Fig.37 and 38, for example, in these stationary rolling devices 62 (analogous to rolling device 60), the take-up rollers 82 are rotatably mounted in a frame 134, and the necessary torque is introduced by an external drive 136. The rolling device 62 for the trickling device 24 can also be provided with the pivoting device 94 in the stationary version. For this purpose, the frame 134 is pivotally mounted about a pivot axis 138. The pivoting into different pivot positions is actuated by a pivot actuator 140, as shown in Figs. 39a and 39b. As already mentioned, it is advantageous for a better trickling result if the workpiece to be trickled is pivoted in its horizontal position. Even with this stationary support, it is possible to pivot the roller device 62 within the required range in order to then position the trickling nozzles 22a, 22b in the correct location, for example, from above. In the various embodiments of the trickling system 26 shown, the stator 10 is held in position during the trickling process or during the gelling process or during transport from the trickling to the gelling process or any combination thereof only by its own gravity and is rotated about its own horizontal axis. For this purpose, a cylindrical outer surface on the stator 10 can also be used directly, if available; the rolling devices 60, 62 are particularly suitable for rolling a cylindrical outer surface provided directly on the stator 10 as a rolling surface. Preferably, the stator 10 is pre-assembled in the holder 48 before trickling, with which the stator 10 is placed in the trickling area, gelling area, or transport area, or a combination thereof. An advantage of such a holder 48, in particular designed as a cage, is that even stators 10 with a non-cylindrical outer contour or protruding elements such as screw-on options, interconnection elements, etc. can be placed in a rotating manner in an associated rolling device 60, 62. Gravity is also sufficient to transmit the force for rotation of the stator 10 with or without the holder 48.Thus, the rolling device 60, 62 can accommodate, position, and rotate a stator 10 or holder 48 without the holder 48 or stator 10 itself being actively clamped or held by the rolling device 60, 62. Thus, no actuator is required on the holder 48 itself or on the rolling device 60, 62. The holder 48 is held in position by gravity after being loaded into the rolling device 60, 62. of the holder 48 with stator 10 is sufficient for the rotational transmission to take place in the holder 48. In this case, this force transmission is preferably introduced into the holder 48 or stator 10 via rotating rollers 66 on the rolling device 60, 62, which takes place on an outer surface (as a rolling surface) of the holder 48 with stator or on the stator 10 itself. This power transmission can be purely force-locking (e.g. with friction wheels as rollers), or also form-locking such as a toothing (e.g. pinion 84). The positioning of the holder 48 or stator 10 can be carried out via four rollers 66, as in the present case, and the introduction of the force for rotation takes place via the same rollers 66, or via separate rollers 66 or, for example, via a separate pinion 84. As mentioned, with the receptacle for the holder 48 / stator 10 designed as a rolling device 60, 62, no clamping device, holding device or actuator is required to hold the holder 48 or the stator 10 in position on the rolling device 60, 62; even when loading or unloading this rolling device 60, 62, no actuator, force, etc. has to be introduced into the rolling device 60, 62, since the stator 10 or holder 48 remains in this position purely due to gravity. Preferably, the necessary torque is also applied to the stator 10 orHolder 48 for the rotary movement, whereby preferably all positioning elements / guide elements 64 also transmit the rotary movement (as in an all-wheel drive). One possible function of the rolling device 60, 62 is thus to hold the holder 48 or stator 10 in position and to correspondingly transmit a force for rotating the stator 10, without having an active actuator to generate the force for the rotary movement. The force required to rotate the stator 10 or holder 48 is therefore not actively generated in the rolling device 60, 62, but is generated externally and only passed through the rolling device 60, 62. This force can also be generated by any other form of energy (pneumatics, fluid). This means that the rolling device 60, 62 itself does not have an energy converter which, for example, converts electrical or pneumatic energy into a force orinto a torque, but rather, only mechanical power is passed through the rolling device 60, 62. This has the advantage that no temperature-resistant and therefore expensive actuators need to be used when the rolling device 60, 62 is placed in a gelling oven 32 during the curing of the stator 10. Preferably, as many rolling devices 60 as possible are driven by an external actuator such as a motor, e.g., the rolling devices 60 are driven by a common drive chain 86. In some embodiments, the trickling system 26 is designed such that the actuator-free rolling device 60, 62 is installed stationary in the respective trickling or gelling areas, and the transport of the stator 10 or holder 48 with stator 10 takes place without this rolling device 60, 62, e.g. by means of robot gripper 126. In some embodiments, the trickling system 26 is designed such that this actuatorless rolling device 60, 62 cycles from the trickling station to the gelling station, directly transporting the holder 48 or stator 10, preferably rotating it without interruption. The energy required to rotate the stator 10 is preferably introduced into the rolling device 60, 62 by various actuators. This has the advantage that the actuator or energy source for rotating the stator 10 does not need to be clocked. Thus, especially when clocking in a gelling oven 32, it is possible to avoid expensive energy converters, such as motors within the hot area. The energy is introduced from outside into the hot gelling area by means of a rotary drive gear 158, e.g., by means of a revolving drive chain 86, and is passed on through the rolling device 60 to the holder 48 or stator 10 itself, thus causing the holder 48 or stator 10 to rotate. In some embodiments, a different energy source or motor is specifically provided to drive the rotation via the rolling device 62, especially during trickling and the preferred pivoting, since pivoting movements in both directions are also provided for the rolling device 62, especially during trickling, i.e. the horizontal axis of rotation of the stator 10 is pivoted into the vertical by preferably up to + / - 15° (or possibly more) during trickling. This makes it difficult to drive all of the rolling devices 60, 62 with one actuator or energy source, such as a motor via a drive chain 86, and it is more sensible, especially during trickling, to drive the rolling device 62 individually or separately from the gelling or transport station via a drive mounted at the trickling station. This can be done, for example, via a separate chain which drives several shafts 90 via pinions. In one embodiment of a rolling device 60, 62, at least two shafts 80, 90 are provided, on which a total of at least three rollers 66 are located, which are positioned below the center, preferably on outer surfaces, relative to the stator 10 or holder 48. Thus, the stator 10 or holder 48 is held and positioned on at least three rollers 66 solely by gravity. The axial positioning can be achieved by flanged wheels 74 on the rollers 66, by V-grooves 76 on the rollers 66 or by crowned rollers or by further rollers arranged axially or on the end face. In addition, at least one shaft 80, 90 of this rolling device 60, 62 is driven externally; preferably, all shafts 80, 90 or rollers 66 are driven, whereby rotation or turning of the stator 10 or holder 48 is initiated. The force or torque is introduced into the rolling device 60, 62 via friction wheels, chain wheels, belt wheels, or other possible transmission means. As already mentioned, the energy source or actuator is not located directly on the rolling device 60, 62. In addition, the rolling device 60, 62 does not have an actuator or energy source for clamping or holding the stator 10 on the rolling device 60, 62; the stators 10 orHolders 48 remain in their position on the rolling device purely by gravity. During the trickling process and during the optional pivoting of the stator 10 from the horizontal rotational position, it may be advantageous for certain unfavorable stator designs to additionally secure the cage or stator against tipping during rotation. However, this is possible without major problems at the trickling station, since the trickling station is typically located at room temperature and not within a furnace 32, where this actuator technology is expensive. For example, in some embodiments, a temporary axial adjustment of, for example, support rollers to the end faces of the holder 48 or stator 10 is possible without problems at the trickling station. For improved impregnation of stators (48) in series production, holders (48) with at least one rolling surface (58a, 58b) and system components of a trickling system (26) with a rolling device (60, 62) are proposed, on which the holders (48) with clamped stators (10) or, in the case of stators (10) with a cylindrical outer surface suitable as a rolling surface (58a, 58b), rest purely by gravity. Thus, complex actuators of clamping devices for holding the stators for trickling or gelling can be eliminated. List of reference symbols: 10 Stator 12 Internal clamping unit 14 sheet package 16 grooves 18 windings 20 insulation paper 22a-22d trickle nozzles 24 trickling device 26 trickle system 28 winding heads 30 frontal area 32 oven 34 Drip area 36a, 36b Gelling area 38 Curing area 40 T ransport facility 42 Conveyor belt 44 Handling unit 46 Robot arm 48 holders 50 gelling device 52 Curing device 54 batches 55 Loading and unloading point 56 clamping device 56a axial clamping device 56b radial clamping device 58a, 58b Rolling surface 60 Rolling device (gelling device) 62 Rolling device (trickling device) 64 guide element 66 roll 68 rail 70 Transport chain, especially circulating chain (example of traction device of the conveyor belt) 72 tread 74 flanged disc 76 ring projection 80 wave 82, 82a, 82b Pick-up roller 84, 84a, 84b, 84c pinion 86, 86a, 86b, 86c Drive chain (rotation, example of rotary drive gear) Lifting device Lifting shaft Trickle nozzle arrangement Swivel device Transfer area Driver Actuator on the driver Actuator for resetting a, 104b, 104c Ring element strut Spring common support Bayonet right bayonet left clamping element Screw-Z-wedge gear V-groove gripper robot mandrel filing Frame external drive Torque introduction for rotation Swivel axis Swivel actuator Transport track Lead area Return area first deflection area second deflection area Deflection curve first level second level rotary drive gear

Claims

Claims:

1. Holder (48) for holding, rotating and transporting a stator (10) during impregnation of the stator (10) with resin, wherein the holder (48) has a clamping device (56, 56a, 56b) for clamping the stator (10) and at least one rolling surface (58a 58b) for rollingly supporting the rotating holder (48) with the clamped stator (10).

2. Holder (48) according to claim 1, characterized in that it is designed as a cage which surrounds the clamped stator (10) during use.

3. Holder (48) according to one of the preceding claims, characterized in that the at least one rolling surface (58a, 58b) is a rolling surface encircling the stator (10) clamped in use and / or that the at least one rolling surface (58a, 58b) is provided on a radially most projecting outer circumference of the holder (48).

4. Holder (48) according to one of the preceding claims, characterized in that at least one first and at least one second axially spaced rolling surface (58a, 58b) are provided.

5. Holder (48) according to claim 4, characterized in that the first rolling surface (58a) is provided at a first axial end region of the holder (48) and the second rolling surface (58b) is provided at a second axial end region of the holder (48).

6. Holder (48) according to one of the preceding claims, characterized in that the at least one rolling surface (58a, 58b) is formed on at least one annular region (104a, 104b, 104c) of the holder (48).

7. Holder (48) according to claim 6 and one of claims 4 or 5, characterized in that the first rolling surface (58a) is formed on a first ring element (104a) of the holder (48) and the second rolling surface (58b) is formed on a second ring element (104b) of the holder (48) and that the first and the second ring element (104a, 104b) are axially connected to one another.

8. Holder (48) according to claim 7, characterized in that ring elements (104a, 104b, 104c) of the holder (48) are connected to one another by means of axial struts (106).

9. Holder (48) according to one of claims 4 to 7, characterized in that the first and second rolling surfaces (58a, 58b) have the same diameter.

10. Holder (48) according to one of the preceding claims, characterized in that the at least one rolling surface (58a, 58b) is at least partially cylindrical, conical and / or ball-shaped and / or convexly or concavely curved in axial section and / or has at least one groove (124).

11. Holder (48) according to claim 10, characterized in that the at least one rolling surface (58a, 58b) has at least one first circumferential conical region and at least one second circumferential conical region, wherein the first and the second conical region (124) are inclined in opposite directions and / or are mirror images of one another.

12. Holder (48) according to one of the preceding claims, characterized in that a circumferential toothing (86) is provided for positively driving a rotation of the holder (48) with the clamped stator (10).

13. Holder (48) according to claim 12, characterized in that the toothing is formed on a separate ring element (104c) of the holder (48) or on a ring element which also has the rolling surface or one of several rolling surfaces (58a, 58b).

14. Holder (48) according to one of the preceding claims, characterized in that the clamping device (56, 56a, 56b) is designed for radial and / or axial positive and / or non-positive clamping of the stator (10) on an outer side of the stator (10).

15. Holder (48) according to one of the preceding claims, characterized in that the clamping device (56, 56a, 56b) has radially movable clamping elements (120) with radially inwardly directed clamping surfaces and / or axially movable clamping elements with clamping surfaces directed axially towards one another.

16. Holder (48) according to claim 15 and claim 8, characterized in that the clamping elements (120) are arranged radially movable on the struts (106).

17. Holder (48) according to one of the preceding claims, characterized in that the clamping device (56, 56a, 56b) 17.1 at least one thread for moving at least one clamping element (120) of the clamping device by screwing and / or 17.2 has at least one spring (106) for elastically clamping the stator (10).

18. Holder (48) according to one of the preceding claims, characterized in that the clamping device (56, 56a, 56b) is designed to receive the stator (10) in a release position without dismantling clamping elements (120) of the clamping device.

19. Holder (48) according to one of the preceding claims, characterized in that the clamping device (56, 56a, 56b) has clamping elements which are arranged radially inside the at least one rolling surface (58a, 58b).

20. Holder (48) according to one of the preceding claims, characterized in that clamping elements (120) of the clamping device (56, 56a, 56b) are formed on ring elements (104a, 104b, 104c) of the holder (48), on the outer circumference of which the at least one rolling surface (58a, 58b) is formed. 21 . Holder (48) according to claim 20 and claim 8, characterized in that the struts (106) are designed as telescopic elements.

22. Use of a holder (48) according to one of the preceding claims for holding and rotating a stator during trickling impregnation during trickling and gelling.

23. Use according to claim 22, characterized in that the holder (48) with clamped stator (10) in a gelling device (50) for gelling by resting the at least one rolling surface (58a, 58b) on a rolling device (60) of the gelling device (50) is held solely by gravity and is rotated about an axis of rotation coinciding with a central axis of the stator (10).

24. Use according to claim 22 or 23, characterized in that the holder (48) with clamped stator (10) in a trickling device (24) for Trickle impregnation by placing the at least one rolling surface (58a, 58b) on a rolling device (62) of the trickling device (24) is held solely by gravity and is rotated about an axis of rotation coinciding with a central axis of the stator (10).

25. Use according to claim 24, characterized in that the holder (48) rolling on the rolling device (62) of the trickling device (24) is inclined during trickling by means of the rolling device (62) about a substantially horizontal pivot axis (138) extending transversely to the axis of rotation.

26. Use according to claim 24 or 25, characterized in that the holder (48) with clamped stator (10) for trickling is lifted from a delivery track by means of the rolling device (62) of the trickling device (24).

27. Use according to one of claims 23 to 26, characterized in that the respective rolling device (60, 62) has a plurality of guide elements (64) on which the at least one rolling surface (58a, 58b) is deposited, wherein the guide elements (64) are adapted to guide the holder (48) such that it executes a concentric rotation about its longitudinal axis.

28. Use according to claim 27, characterized in that the guide elements (64) of the rolling device (60, 62) are selected from a group comprising rollers (66), pinions, contoured wheels, gears, rails (68), circulating chains (70), running surfaces (72), rollers with flanged wheels (74), rollers with V-grooves, rollers with a spherical running surface, rollers with an annular projection (76) on the running surface, rollers with grooves on the running surface, rollers (66) connected by means of a chain (70) or a conveyor belt (42), actively driven rollers (66), actively driven pinions and rollers (66) connected by a common shaft (80, 90), pinions and contoured wheels.

29. Use according to one of claims 27 or 28, characterized in that at least one of the guide elements (64) of the rolling device (60, 62) initiates the rotational movement into the holder (48).

30. Use according to one of claims 27 to 29, characterized in that the or at least some of the guide elements (64) are each rotatable about an axis of rotation whose position deviates from the position of the axis of rotation of the holder (48). 31 . Use according to one of claims 27 to 30, characterized in that the guide elements (64) comprise a first to fourth roller (66), wherein the first and second rollers engage, axially spaced from one another, on the at least one rolling surface (58a, 58b) of the holder (48) in an angular position between 3 o'clock and 6 o'clock and the third and fourth rollers (66) engage, axially spaced from one another, on the at least one rolling surface (58a, 58b) in an angular position between 6 o'clock and 9 o'clock.

32. Use according to one of claims 23 to 31, characterized in that the rolling device (60, 62) has adjacent support locations for a first and a second holder (48), wherein a common shaft (90) or roller is arranged between the receiving locations, on which the first holder (48) and the second holder (48) rest, so that a rotation of one holder can be transmitted to the second holder (48) via the common shaft (90) or roller or that the first and the second holder (48) are driven in rotation via the common shaft (90) or roller.

33. Use according to one of claims 22 to 30, characterized in that a series of stators (10) are impregnated in a large-scale production by trickling impregnation, each stator (10) being held in a separate holder (48) according to one of claims 1 to 20 for trickling and gelling.

34. Plant component of an impregnation plant (26) for impregnating stators (10) in series production, comprising a rolling device (60, 62) which is designed to roll one or more Holder (48) according to one of claims 1 to 21, each with a clamped stator (10) or a stator (10) itself with a cylindrical outer surface as a rolling surface (58a, 58b) by supporting the at least one rolling surface (58a, 58b) on the rolling device (60, 62) and rotating it about an axis of rotation coinciding with a central axis of the stator (10).

35. System component according to claim 34, designed as a gelling device (50) for gelling resin previously introduced into the stator (10).

36. Plant component according to claim 35, characterized in that the gelling device (50) is selected from the group comprising a convection oven (32), a gelling device with an induction coil, a stationary gelling device to which the stators (10) held in the holders (48) or the cylindrical stators (10) themselves are transported after the resin application, and a continuous oven through which the stators (10) held in the holders or the cylindrical stators (10) themselves are cycled.

37. System component according to claim 34, designed as a dripping device (24) with at least one dripping nozzle (22a-22d) for dripping resin.

38. Plant component according to claim 37, characterized in that the rolling device (62) is designed to lift the at least one holder (48) rolling thereon with the stator (10) clamped therein or the cylindrical stator (10) itself and / or to incline it relative to the horizontal.

39. Plant component according to one of claims 37 and 38, characterized in that several drip nozzles (22a-22d) for dripping resin onto winding heads (28) are provided on both sides of the stator (10) clamped in the holder (48) or of the cylindrical stator (10) itself.

40. System component according to claim 34, designed as a curing device (52) for curing the gelled resin.

41. Plant component according to claim 34, designed as a transport device (40) for transporting a series of holders (48) or cylindrical stators (10), wherein several of the rolling devices (60) are arranged on a conveyor belt (42).

42. System component according to one of claims 34 to 41, characterized in that the rolling device (60) has a plurality of guide elements (64) on which the at least one rolling surface (58a, 58b) can be placed, wherein the guide elements (64) are designed to guide the holder (48) or the cylindrical stator (10) in such a way that it executes a concentric rotation about its longitudinal axis.

43. Plant component according to claim 42, characterized in that the guide elements (64) of the rolling device (60, 62) are selected from a group comprising rollers (66), pinions, contoured wheels, gears, rails (68), circulating chains (70), running surfaces (72), rollers with flanged wheels (74), rollers with V-grooves, rollers with a spherical running surface, rollers with an annular projection (76) on the running surface, rollers with grooves on the running surface, rollers (66) connected by means of a chain (70) or a belt (42), actively driven rollers, actively driven pinions and rollers, pinions and contoured wheels connected by a common shaft (80, 90).

44. System component according to one of claims 42 or 43, characterized in that at least one of the guide elements (64) of the rolling device (60, 62) is designed to initiate the rotational movement into the holder (48) or the cylindrical stator (10) itself.

45. System component according to one of claims 42 to 44, characterized in that the or at least some of the guide elements (64) are each rotatable about an axis of rotation, the position of which deviates from the position of the axis of rotation of the holder (48) or stator (10).

46. ​​Plant component according to one of claims 42 to 44, characterized in that the guide elements (64) comprise a first to fourth roller (66), wherein the first and second roller (66) are arranged axially spaced from one another to engage the at least one rolling surface (58a, 58b) of the holder (48) or cylindrical stator (10) in an angular position between 3 o'clock and 6 o'clock, and the third and fourth roller (66) are arranged axially spaced from one another to engage the at least one rolling surface (58a, 58b) in an angular position between 6 o'clock and 9 o'clock.

47. System component according to one of claims 34 to 46, characterized in that the rolling device (60, 62) has adjacent support locations for a first and a second holder (48) or first and second cylindrical stator (10) itself, wherein a common shaft (90) or roller is arranged between the receiving locations, which is designed such that the first holder (48) or first cylindrical stator (10) and the second holder (48) or second cylindrical stator (10) rest thereon, so that a rotation of one holder or stator can be transmitted to the second holder or stator via the common shaft (90) or roller or that the first and second holder or first and second cylindrical stator are driven in rotation via the common shaft (90) or roller.

48. A trickle impregnation system (26) for trickle impregnation of stators (10), comprising a plurality of system components according to one of claims 34 to 47 or a plurality of holders (48) according to one of claims 1 to 21 and at least one system component according to one of claims 34 to 47.

49. A trickling system (26) according to claim 48, characterized by a handling unit for loading, unloading or transferring stators (10) held in the holders (48), wherein the handling unit 49.1 for gripping at least one stator (10) on its inner circumference and / or 49.2 for gripping the at least one holder (48) is set up.

50. Trickling system (26) according to one of claims 48 or 49, characterized by a conveyor belt (42) with rolling devices (60) which are designed to rotatably support the at least one rolling surface (58a, 58b) of the holder (48) or cylindrical stator (10) itself, wherein the conveyor belt (42) is designed to convey the stators (10) held in the holders (48) or the cylindrical stators (10) themselves by means of a plurality of system components arranged one behind the other in the conveying direction.

51. Trickling system (26) according to claim 50, characterized by a loading station which is designed for placing a group of stators (10) held in the holders (48) or of cylindrical stators (10) onto the conveyor belt (42) in batches.

52. A method for drop impregnating a wound stator (10), comprising: providing a holder (48) according to any one of claims 1 to 21, Clamping the stator (10) in the clamping device (56, 56a, 56b), carrying out a trickling and a gelling on the stator held in the holder (48), wherein the holder (48) rolls over the at least one rolling surface (58a, 58b) in order to rotate the stator (10).

53. Method according to claim 52, characterized by a use according to one of claims 22 to 33 and / or by using one or more system components according to one of claims 34 to 47.

54. Method according to one of claims 52 or 53, carried out by means of a trickling system (26) according to one of claims 48 to 51.

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