CN117353477A - Motor device, external rotor motor and method for manufacturing stator lamination group of external rotor motor - Google Patents

Abstract

The invention relates to a motor device (36 a;36b;36 c), in particular an outer rotor motor device, comprising a plurality of stator plates (10 a;10b;10 c) each having at least one through-opening (12 a;12b;12 c). It is proposed that the stator plates (10 a;10b;10 c) are connected to form a stator lamination stack (14 a;14b;14 c) in such a way that the through-openings (12 a;12 b) form cooling channels (16 a;16b;16 c) that penetrate the stator lamination stack (14 a;14b;14 c) and that the through-openings (14 a;14b;14 c) of at least two adjacent stator plates (10 a;10b;10 c) only partially overlap one another when viewed in the axial direction (18 a;18b;18 c) of the stator lamination stack (14 a;14b;14 c).

Description

Motor device, external rotor motor and method for manufacturing stator lamination group of external rotor motor

Technical Field

The invention relates to an electric motor arrangement, an external rotor electric motor and a method for producing a stator lamination stack for an external rotor electric motor.

Background

A motor apparatus has been proposed which has a plurality of stator pieces each having at least one through hole.

Disclosure of Invention

The invention relates to a motor device, in particular an external rotor motor device, having a plurality of stator plates, each of which has at least one through-hole.

It is proposed here that the stator plates are connected to form a stator lamination stack in such a way that the through-openings form cooling channels that penetrate the stator lamination stack and that the through-openings of at least two adjacent stator plates overlap one another only partially, as seen in the axial direction of the stator lamination stack. By means of the embodiment of the motor device according to the invention, the cooling can be advantageously improved. The drive power can be advantageously increased. Assembly complexity can be advantageously reduced. The manufacturing and assembly costs can be reduced particularly advantageously.

"motor arrangement" shall particularly mean a motor which is driven in rotation, in particular by providing torque. Preferably, the motor device is configured as an external rotor motor device. Preferably, the outer rotor of the outer rotor motor device rotates in the outer rotor motor around a stationary stator of the outer rotor motor device. Preferably, the stator has a support structure for receiving and/or supporting the outer rotor. The outer rotor preferably has a compressor and/or a blower which is provided for generating an air flow for cooling during operation, in particular when the outer rotor rotates about the stator. "set-up" shall mean in particular specifically programmed, designed and/or equipped. By "an object is provided for a specific function" it is meant in particular that the object fulfills and/or performs such a specific function in at least one use state and/or operating state.

By "stator sheet" is meant in particular a plate-shaped and/or thin and/or flat, in particular made of a metallic material, which are arranged next to one another, in particular with their greatest outer surfaces in contact, and form a stator and/or a stator lamination stack. Preferably the stator plate has an at least substantially circular shape when viewed perpendicular to the main plane of extension of the stator plate. "stator lamination stack" shall mean in particular at least two stator sheets juxtaposed to one another. Preferably at least two stator sheets, in particular a plurality of stator sheets, form a stator lamination stack. Preferably the stator comprises one or more stator sheets and/or one or more stator lamination packs. Preferably, all stator sheets forming the stator and/or the stator lamination stack are identically formed. However, in an alternative embodiment, the stator plates can also be configured differently from one another. Preferably, each stator plate has a particularly centrally arranged support recess, which is provided for supporting the outer rotor in the stator. The "main plane of extension" of a structural unit shall mean in particular a plane which runs parallel to the largest side of the smallest imaginary cuboid which just also completely encloses the structural unit and in particular extends through the center of the cuboid.

By "through-hole" is meant in particular a perforation of the stator plate oriented perpendicular to the main extension plane of the stator plate, in particular a void in the stator plate. Preferably, two adjacent stator plates are juxtaposed to one another in contact, in particular at least substantially parallel to one another in the main plane of extension of the stator plates. The stator plates are preferably arranged in a twisted and/or displaced and/or tilted manner relative to one another in such a way that the through-openings overlap one another only partially in the axial direction. It is also conceivable that the through-openings of the two stator plates have different geometries and/or different arrangements, in particular perforation patterns, from one another, so that they only partially overlap one another in the axial direction. This is to be understood in particular as meaning that the two through-openings of adjacent stator plates are "merely split overlapping" one another in the axial direction, said through-openings not being arranged one above the other and/or one above the other. In particular, one of the through-holes of the two stator plates does not completely overlap the through-hole of the other stator plate. In particular, the through-openings of two adjacent stator plates of the motor arrangement do not overlap completely and/or incompletely. The through-holes of the stator plates, in particular all stator plates, are formed at least substantially identically to one another. By "axial direction" is meant in particular a direction oriented perpendicular to the main extension plane of the stator plates, which preferably overlaps or at least runs parallel to the rotation axis of the outer rotor.

"cooling channel" shall mean in particular a channel and/or a bore and/or a channel through which a fluid, in particular air, can flow and which is provided for cooling, in particular for heat transfer from the stator plate to the cooling air. Preferably, the cooling passage is formed by through holes of the stator plates juxtaposed to each other. Preferably, the at least one through-opening, which in particular forms a cooling channel, is completely surrounded and/or delimited by the stator plate in the main plane of extension of the stator plate.

It is furthermore proposed that at least the two adjacent through-openings of the stator plates, which at least partially form the cooling channel, preferably all through-openings of the stator plates, which together form the cooling channel, are at least substantially identical. Manufacturing costs can be advantageously reduced. Assembly complexity and component complexity can advantageously be reduced. Preferably, the geometry and arrangement of the through-holes, in particular the perforation pattern of the stator sheets, is at least substantially identical in at least two adjacent stator sheets, in particular in all stator sheets. By "substantially identical" is meant in particular that the deviation of the area of the through-holes is at most 5%, preferably at most 3%, preferably at most 1% and particularly preferably within the limits of manufacturing tolerances when placed precisely one above the other.

It is furthermore proposed that at least two stator plates of the stator lamination stack, in particular at least two adjacent stator plates of the stator lamination stack, preferably all stator plates of the stator lamination stack, are at least substantially identical. The manufacturing costs can advantageously be further reduced. Assembly complexity and component complexity can advantageously be further reduced. The wall thickness, in particular the thickness of the stator plate in the axial direction, is preferably at least substantially equally large. Alternatively, however, it is also conceivable for the stator plates to have different thicknesses. Preferably, the stator plates have an outer diameter that is at least substantially the same. Preferably at least two, in particular all stator plates consist of the same material. "substantially equally large" shall mean in particular that the deviation of the magnitudes is at most 5%, preferably at most 3%, preferably at most 1% and particularly preferably that the deviations of the magnitudes lie within the range of manufacturing tolerances.

It is furthermore proposed that the stator plates are arranged in a twisted manner relative to one another about the axial direction of the stator lamination stack. The cooling power can be advantageously increased. The term "twisted" should in particular mean that two adjacent through-openings forming the cooling channels are angled relative to one another, in particular around the axial direction of the stator lamination stack and/or the stator plates, so that the through-openings, in particular the perforation pattern, of the two stator plates are not arranged one above the other. The surface for heat transfer from the stator plate to the cooling air is preferably enlarged by the torsion of the stator plate around the axial direction. The cooling power can be adjusted and/or varied and/or regulated, preferably by a change in the torsion angle. It is conceivable that the stator plates are arranged in a twisted and moving manner relative to each other.

It is furthermore proposed that each stator segment is arranged in such a way that it is twisted in the same direction with respect to the adjacent stator segment. The cooling power can be advantageously increased. The "direction" should be a rotational direction that rotates clockwise or counterclockwise, in particular about an axial direction, in particular when the main plane of extension of the stator plate is viewed perpendicularly. Preferably, each stator segment is twisted by the same angle, in particular around the axial direction, with respect to the adjacent stator segment.

Furthermore, it is proposed that a plurality of teeth are arranged side by side on the radially outer side of the stator plate, as seen in the circumferential direction, and that the teeth define a tooth spacing, wherein the stator plate is arranged in such a way that it is twisted relative to one another by exactly one tooth spacing or a plurality of times the tooth spacing. Manufacturing costs can be advantageously reduced. The assembly can advantageously be simplified. "radially outer side" shall mean in particular an outer surface which represents the outermost limit in the radial direction (as seen from the axial direction and/or the axis of rotation) of the stator plate. By "tooth" is meant in particular a geometry which is suitable and provided for carrying and/or fixing a further component, in particular a winding of an electromagnet. Preferably, the tooth spacing is predefined by the plurality of teeth arranged on the radially outer circumference. The stator plates are preferably arranged in a manner twisted by a number of times the tooth pitch, wherein the teeth of two adjacent stator plates are arranged overlapping and/or overlapping.

It is furthermore proposed that a plurality of stator plates of the stator lamination stack be combined to form a sub-lamination stack having at least one through-opening arranged one behind the other. The cooling power can be advantageously increased. The assembly complexity can be reduced particularly advantageously. The cooling power can preferably be adjusted and/or varied and/or regulated by the plurality of stator plates forming a particularly stacked sub-stack of laminations. In particular, the sub-lamination stack comprises at least two, advantageously at least three, preferably at least four and preferably at least five stator sheets. It is conceivable that each sub-stack forming a stator stack comprises a different number of stator plates. Preferably, the stator lamination stack comprises at least one sub-lamination stack, particularly preferably the stator lamination stack comprises a plurality, in particular a plurality, of sub-lamination stacks.

It is furthermore proposed that the cooling channels are completely delimited by the stator plates in the circumferential direction thereof. The cooling power can advantageously be improved and/or increased. The cooling air flow can advantageously be generated and/or regulated. Preferably, the through-opening is completely defined by the stator plate, seen in a main plane of extension of the stator plate, when viewed vertically. Preferably the through holes of the stator plates are formed and/or defined by the stator plates. Preferably, the stator plates are arranged in contact along the axial direction. It is conceivable that a spacer is arranged between two stator pieces, whereby the stator pieces can be arranged in a contactless manner.

It is furthermore proposed that the cooling channel extends helically in the axial direction. The cooling power can be advantageously increased. The term "spiral" shall mean in particular spiral and/or thread-like. In particular, the cooling channels extend at an angle to the axial direction. In particular, the cooling channels extend at an angle other than 90 ° with respect to the radial direction. In particular, the cooling channels extend over the entire axial length of the stator.

It is furthermore proposed that the at least one cooling channel has a stepped channel shape. The cooling power can be advantageously increased. Preferably, the end sides of the stator plates defining the through-holes are arranged at least substantially parallel to the axial direction. The term "stepped" is intended to mean, in particular, a progression of the cooling channel which changes stepwise in the axial direction and in the circumferential direction, in particular by the torsion angle between two adjacent stator plates and/or by the stator plate thickness, and is thus divided into separate subregions.

It is furthermore proposed that each stator plate has a plurality of through-openings and that each through-opening participates in the formation of a separate cooling channel. A particularly uniform cooling of the stator can advantageously be achieved. Preferably the number of through holes of the stator plate defines the number of cooling channels of the stator. The through-openings are preferably arranged uniformly in the circumferential direction, in particular around the axial direction, for forming the cooling channel. Preferably, at least one through-opening of the stator plate forming the cooling channel and particularly preferably all through-openings of the stator plate forming the cooling channel are arranged, as seen perpendicular to the main extension plane, between the teeth arranged on the outer circumference and the centrally arranged support recess. It is conceivable that the cooling channels are connected to one another and/or transition into one another.

Furthermore, an external rotor motor having a motor device is proposed. A particularly high power of the external rotor motor can advantageously be achieved by the motor arrangement.

Furthermore, a method is proposed in which the stator plates are connected, in particular adhesively bonded, to form a stator lamination stack in such a way that the through-openings form cooling channels that penetrate the stator lamination stack and that the through-openings of at least two adjacent stator plates overlap one another only partially when viewed in the axial direction of the stator lamination stack. The assembly can advantageously be simplified. Advantageously, the production can be simplified. The stator segments are preferably connected in particular inseparably to a stator lamination stack and/or to a stator by a heat treatment process, in particular an annealing process. By "material-locking connection" is meant, in particular, that the material parts (Masseteile) are brought together by atomic or molecular forces, such as, for example, soldering, welding, adhesive bonding and/or vulcanization. Preferably, at least two adjacent stator lamination packs are arranged in a twisted manner relative to each other about the axial direction.

The motor device according to the invention, the external rotor motor according to the invention and the method according to the invention should not be limited to the applications and embodiments described above. In particular, the motor device according to the invention, the external rotor motor according to the invention and the method according to the invention can have a different number of individual elements, components, method steps and units than the number mentioned here in order to fulfill the principle of action described here. Furthermore, for the numerical ranges described in this disclosure, numerical values that are within the limits mentioned are also to be regarded as being disclosed and can be arbitrarily used.

Drawings

Further advantages emerge from the following description of the figures. Three embodiments of the invention are shown in the drawings. The figures, description and claims contain a number of features in combination. Those skilled in the art will also suitably study the features individually and generalize them to other meaningful combinations. Wherein:

fig. 1 shows a schematic view of an external rotor motor with a motor arrangement;

fig. 2 shows a schematic representation of an electric motor arrangement with a stator lamination stack in a top view;

fig. 3 shows a schematic cross-section of the stator stack along the axis A-A in fig. 2;

fig. 4 shows a schematic flow chart of a method for producing a stator lamination stack for an external rotor motor;

fig. 5 shows a schematic cross-section of an alternative motor arrangement and

fig. 6 shows a schematic illustration of the electric motor arrangement with a stator lamination stack in a top view.

Detailed Description

Fig. 1 shows a schematic view of an outer rotor motor 46a. The outer rotor motor 46a has an outer rotor 32a. The outer rotor motor 46a has a stator 48a. The stator 48a is formed by the stator lamination stack 14a. The outer rotor 32a rotates around the stator 48a. The outer rotor 32a rotates about a rotation axis 62 a. The rotation axis 62a is arranged centrally in the main plane of extension of the stator stack 14a. The outer rotor motor 46a has a motor device 36a. The motor device 36a is configured as an outer rotor motor device. The outer rotor motor 46a is provided for providing driving. The outer rotor motor 46a is provided for supplying torque. The outer rotor motor 46a has a compressor 38a. The compressor 38a can also be a blower. The compressor 38a has a vane set 42a. The blade group 42a is constituted by a plurality of blades 44 a. The compressor 38a is configured to generate an air flow 40a (see fig. 3). The compressor 38a generates a negative pressure. The negative pressure then creates an air flow 40a. The negative pressure sucks in cooling air through the cooling channels 16a of the stator 48a. The air flow 40a is provided for cooling the stator 48a. The outer rotor motor 46a has an electromagnet 30a. The electromagnets 30a each include windings 28a. The electromagnet 30a is provided for generating a torque for driving. The motor assembly 36aa has a plurality of stator plates 10a. The stator plates 10a form a stator stack 14a. The stator plate 10a and/or the stator lamination stack 14a form a stator 48a. The stator 48a is configured as a fixed member of the outer rotor motor 46a. The outer rotor 32a is configured to rotate about the stationary stator stack 14a during operation. The stator stack 14a forms a stator 48a. The windings 28a are arranged on the radial outer side 20a of the stator 48a. The stator 48a has cooling channels 16a.

Fig. 2 schematically shows a top view of the stator plate 10a. The stator plate 10a has a circular outer shape. The outer diameter of the stator plate 10a is much larger than the thickness of the stator plate 10a. Each stator piece 10a has a through hole 12a. The example shown in fig. 2 has illustratively nine through holes 12a. It is also conceivable that each stator plate 10a has a number of through holes 12a different from nine. The through-opening 12a is at least substantially triangular in shape when viewed perpendicularly to the main plane of extension of the stator plate 10a. The through hole 12a becomes wider toward the radial outer peripheral edge in the radial direction. Two through-holes 12a lying next to one another in the main plane of extension of the stator plate 10a have the same distance from one another. Two through-holes 12a arranged next to one another in the main extension plane of the stator plate 10a have at least one parallel lateral limitation of the through-holes 12a. It is conceivable that the through-hole 12a is formed, for example, circularly or quadranglely. Other geometries of the through-going hole 12a can be envisaged. The plurality of through holes 12a can be formed in such a manner as to be united into one through hole 12a, and thus each stator piece 10a can have only three through holes 12a per stator piece 10a, for example. The through-holes 12a can also be made smaller, so that each stator piece 10a can also have more than 15 through-holes 12a, for example.

Each stator piece 10a has the same number of through holes 12a. The stator plate 10a is formed of a metal material. The stator plates 10a are connected to form a stator stack 14a in a material-locking manner. The stator plates 10a are bonded to form a stator stack 14a by a heat treatment process. Alternatively, the stator plates 10a can also be welded to form a stator stack 14a. The stator plates 10a can also be connected to one another in a form-fitting manner. A spacer can be arranged between the two stator plates 10a.

A plurality of teeth 22a are arranged on the radially outer side 20a of the stator plate 10a. The teeth 22a are arranged side by side as seen in the circumferential direction 24a of the stator plate 10a. The winding 28a is fixed to the teeth 22a. The teeth 22a arranged in the circumferential direction 24a define a tooth pitch 60a. Two stator plates 10a arranged side by side in the axial direction 18a are always arranged twisted relative to one another by exactly one tooth pitch 60a or a number of times the tooth pitch 60a. The stator piece 10a has a supporting space 34a in the middle. The support gap 34a is provided for supporting the outer rotor 32a. The through-opening 12a is arranged in the main plane of extension of the stator plate 10a between the bearing recess 34a and the tooth 22a.

Fig. 3 shows a schematic cross-section of the stator stack 14a. The cross section of the stator stack 14a shows the arrangement of the individual stator plates 10a, 10' a, 10 "a. The stator plates 10a are arranged in a twisted manner relative to one another about an axial direction 18a of the stator stack 14a. Each stator piece 10a is arranged in such a manner as to twist in the same direction with respect to the adjacent stator piece 10a. The torsion angle 50a of two adjacent stator pieces 10a is the same for all stator pieces 10a. The torsion angle 50a of two adjacent stator pieces 10a has the same torsion direction for all stator pieces 10a. It is conceivable that the torsion angle 50a between two adjacent stator pieces 10a varies from one stator piece 10a to another.

The through-openings 12a of two adjacent stator plates 10a do not overlap completely as seen in the axial direction 18a of the stator lamination stack 14a. The through-openings 12a of two adjacent stator plates 10a only partially overlap as seen in the axial direction 18a of the stator lamination stack 14a. The torsion angle between two adjacent stator plates 10a causes only partial/incomplete overlap of the through-holes 12a. Only partial/incomplete overlapping of the through-holes 12a can also be achieved by displacement of two adjacent stator plates 10a. Only partial/incomplete overlapping of the through-openings 12a can also be achieved by different geometries of the through-openings 12a. The through holes 12a of two adjacent stator pieces 10a are identically formed. The perforation patterns of all stator pieces 10a are identically constructed. At least two of the stator plates 10a are identically configured. All stator pieces 10a are identically constructed.

The stator plates 10a are connected to the stator stack 14a in such a way that the through-openings 12a form cooling channels 16a that penetrate the stator stack 14a. The cooling passage 16a is penetrated by an air flow 40a. The through holes 12a of two adjacent stator plates 10a constitute cooling passages 16a. The stator sheets 10a of the stator stack 14a form cooling channels 16a. Each through-hole 12a participates in the formation of an individual cooling channel 16a. The cooling channels 16a are completely defined by the stator plate 10a along the circumferential direction 24a thereof. The cooling channel 16a extends helically along an axial direction 18 a. The cooling passage 16a has a stepped passage shape. The torsion angle 50a between two adjacent stator plates 10a determines the area of the through hole 12a along the flow direction of the air flow 40a. The torsion angle 50a and the angle between the air flow 40a and the axial direction 18a are the same. The maximum torsion angle 50a is dependent on the minimum permissible area of the through-opening 12a in the flow direction of the air flow 40a.

Fig. 4 shows a schematic flow chart of a method for producing a stator lamination stack 14a for an external rotor motor 46a. In at least one method step 52, all stator sheets 10a forming a stator stack 14a are provided. In at least one further method step 54, all stator sheets 10a forming the stator lamination stack 14a are arranged relative to one another. When the stator pieces 10a are arranged relative to each other, the torsion angles 50a of the stator pieces 10a relative to each other are oriented. When arranged, the stator pieces 10a are arranged in contact with each other. The stator plates 10a are connected to the stator stack 14a in such a way that the through-openings 12a form cooling channels 16a that penetrate the stator stack 14a. The stator plates 10a are connected to the stator lamination stack 14a in such a way that the through-openings 12a of at least two adjacent stator plates 10a, viewed in the axial direction 18a of the stator lamination stack 14a, only partially overlap one another. In at least one further method step 56, the stator pieces 10a arranged relative to one another are connected in a material-locking manner. The material-locking connection is carried out by a heat treatment process. However, it is also conceivable to weld, braze or bond the stator pieces 10a together. The arrangement of the stator pieces 10a relative to one another is fixed by the cohesive connection. In at least one further method step 58, the stator lamination stack 14a is provided for assembly into an outer rotor motor 46a.

Further embodiments of the present invention are shown in fig. 5 and 6. The following description and the figures are essentially limited to the differences between the embodiments, wherein reference is in principle also made to the figures and/or the description of other embodiments, in particular the figures and/or the description of fig. 1 to 4, with respect to identically denoted components, in particular with regard to components having the same reference numerals. To distinguish the embodiments, the letter a is added after the reference numerals of the embodiments in fig. 1 to 4. In the embodiment of fig. 5, the letter a is replaced by the letter b. In the embodiment of fig. 6, the letter a is replaced by the letter c.

Fig. 5 shows a schematic cross-section of an alternative motor arrangement 36b of an alternative external rotor motor 46 b. The alternative outer rotor motor 46b has an alternative outer rotor (not shown). The alternative outer rotor (not shown) rotates about the axis of rotation 62 b. The alternative motor arrangement 36b has a stator stack 14b. The stator stack 14b is comprised of a plurality of stator plates 10b, 10' b, 10 "b. The stator lamination stack 14b forms a stator 48b. The stator 48b has an axial direction 18b. The alternative motor arrangement 36b has a number of stator plates 10b. The stator plates 10b are joined into a stator stack 14b. The stator pieces 10b are arranged in contact with each other along the axial direction 18b. The plurality of stator plates 10b of stator stack 14b are combined into a sub-stack 26b. The sub-lamination stack 26b is connected to form a stator 48b in a material-locking manner. An alternative motor arrangement 36b in fig. 5 shows a sub-stack 26b of stator plates 10b, 10' b, 10"b, respectively. Alternatively, it is conceivable that the sub-lamination groups 26b are each formed by two stator plates 10b. Alternatively, it is conceivable that the sub-lamination stack 26b is formed of three or more stator sheets 10b. The sub-lamination groups 26b are arranged in contact with each other along the axial direction 18b.

Each stator piece 10b has a plurality of through holes 12b. Each sub-lamination stack 26b has stator plates 10b, 10' b, 10"b with through holes 12b arranged in a stacked manner. The through holes 12b of the stator plates 10b combined into the sub-lamination stack 26b constitute sub-cooling passages 64b. Each sub-lamination stack 26b has a plurality of sub-cooling passages 64b. The stator stack 14b is comprised of a plurality of sub-stacks 26b. The sub-lamination groups 26b are arranged in a twisted manner relative to each other about a rotation axis 62 b. The torsion angle 50b between two adjacent sub-lamination sets 26b is as large. The torsion angle 50b between two adjacent sub-lamination sets 26b has the same torsion direction. The sub-cooling passages 64b of the sub-lamination stack 26b constitute cooling passages 16b. The stator 48b has a plurality of cooling passages 16b. The cooling channels 16b are provided for cooling the stator 48b. For cooling the stator 48b, the cooling channels 16b are penetrated by an air flow 40 b.

Each sub-lamination stack 26b functions like a stator plate 10b having an enlarged thickness defined by a plurality of stator plates 10b forming one sub-lamination stack 26b. All of the previously described features of the stator plate 10b can be applied to the sub-stack 26b.

Fig. 6 schematically shows a top view of the stator plate 10 c. The stator plate 10c has a supporting space 34c. The supporting gap 34c is arranged in the middle of the stator plate 10 c. The stator plate 10c has a through hole 12c. The plurality of stator plates 10c are connected to the stator stack 14c such that each of the through holes 12c forms a cooling channel 16c that penetrates the stator stack 14 c. The stator plate 10c shown in fig. 6 has illustratively nine through holes 12c. It is also conceivable that each stator piece 10c has a different number of through holes 12c than nine. The through-opening 12c is at least substantially triangular in shape when viewed perpendicularly to the main plane of extension of the stator plate 10 c. The through hole 12c becomes wider toward the radial outer peripheral edge in the radial direction. The two through-holes 12c arranged side by side in the main extension plane of the stator plate 10c have the same spacing relative to each other. Two through-holes 12c arranged next to one another in the main plane of extension of the stator plate 10c have at least one parallel lateral limitation of the through-holes 12c. It is conceivable that the through-hole 12c is formed, for example, circularly or quadranglely. The through hole 12c has a surface enlarging element 66c. The surface enlarging element 66c is integrally formed with the stator plate 10 c. Each through hole 12c can also have a plurality of surface enlarging elements 66c. The surface enlarging elements 66c are arranged on the side delimitations of each through-opening 12c, which have the greatest radial distance to the bearing recess 34c. The surface enlarging elements 66c can also be arranged on other side delimitations which delimit the through-opening 12c. For example, a surface enlarging element 66c can be arranged on each lateral boundary of the through-opening 12c. The surface enlarging elements 66c are arranged for enlarging the surface of the cooling channel 16c. The surface enlarging element 66c is provided for increasing the cooling power of the motor arrangement 36c comprising the stator stack 14 c. The surface enlarging elements 66c are rectangular in shape and have rounded corners. It is contemplated that the surface enlarging elements 66c have a rounded, triangular or geometric shape that would appear to be advantageous to one skilled in the art. The surface enlarging elements 66c are configured as projections/lugs which project into the cooling channel 16c at least perpendicularly to the axial direction 18 c.

Claims (13)

1. The motor arrangement (36 a;36b;36 c), in particular an outer rotor motor arrangement, has a plurality of stator plates (10 a;10b;10 c) each having at least one through-opening (12 a;12b;12 c), characterized in that the stator plates (10 a;10b;10 c) are connected to form a stator lamination stack (14 a;14b;14 c) in such a way that the through-openings (12 a;12b;12 c) form cooling channels (16 a;16b;16 c) penetrating the stator lamination stack (14 a;14b;14 c) and the through-openings (12 a;12b;12 c) of at least two adjacent stator plates (10 a;10b;10 c) overlap one another only partially, as seen in the axial direction (18 a;18b;18 c) of the stator lamination stack (14 a;14b;14 c).

2. The electric motor arrangement (36 a;36b;36 c) according to claim 1, characterized in that at least the two adjacent through-holes (12 a;12b;12 c) of the stator pieces (10 a;10b;10 c) that at least partly constitute the cooling channel (16 a;16b;16 c), preferably the through-holes (12 a;12b;12 c) of all stator pieces (10 a;10b;10 c) that together constitute the cooling channel (16 a;16b;16 c), are at least substantially identically constructed.

3. The electric motor arrangement (36 a;36b;36 c) according to any one of the preceding claims, characterized in that at least two stator sheets (10 a;10b;10 c) of the stator lamination stack (14 a;14b;14 c), in particular at least two adjacent stator sheets (10 a;10b;10 c) of the stator lamination stack (14 a;14b;14 c), preferably all stator sheets (10 a;10b;10 c) of the stator lamination stack (14 a;14b;14 c), are at least substantially identically constructed.

4. The motor arrangement (36 a;36b;36 c) according to any one of the preceding claims, wherein the stator plates (10 a;10b;10 c) are arranged in a twisted manner relative to each other about an axial direction (18 a;18b;18 c) of the stator lamination stack (14 a;14b;14 c).

5. The motor arrangement (36 a;36b;36 c) according to claim 4, wherein each stator piece (10 a;10b;10 c) is arranged in a twisted manner in the same direction with respect to the adjacent stator piece (10 a;10b;10 c).

6. The motor arrangement (36 a;36b;36 c) according to any one of the preceding claims, wherein a number of teeth (22 a;22b;22 c) are arranged side by side in the circumferential direction (24 a;24b;24 c) on a radial outer side (20 a;20b;20 c) of the stator plates (10 a;10b;10 c) and a tooth pitch (60 a;60b;60 c) is predefined, wherein the stator plates (10 a;10b;10 c) are arranged twisted relative to each other by exactly one tooth pitch (60 a;60b;60 c) or a number of times the tooth pitch (60 a;60b;60 c).

7. The motor arrangement (36 a;36b;36 c) according to any one of the preceding claims, characterized in that a plurality of stator plates (10 b) of the stator lamination stack (14 b) are united into a sub lamination stack (26 b) each having at least one through hole (12 b) arranged in a stack.

8. The motor arrangement (36 a;36b;36 c) according to any one of the preceding claims, wherein the cooling channel (16 a;16b;16 c) is defined entirely by the stator plate (10 a;10b;10 c) in its circumferential direction.

9. The motor arrangement (36 a;36b;36 c) according to any one of the preceding claims, wherein the cooling channel (16 a;16b;16 c) extends helically along an axial direction (18 a;18b;18 c).

10. The motor arrangement (36 a;36b;36 c) according to any one of the preceding claims, wherein the cooling channel (16 a;16b;16 c) has a stepped channel shape.

11. The motor arrangement (36 a;36b;36 c) according to any one of the preceding claims, wherein each stator piece (10 a;10b;10 c) has a plurality of through-holes (12 a;12b;12 c) and each through-hole (12 a;12b;12 c) participates in the formation of a separate cooling channel (16 a;16b;16 c).

12. An outer rotor motor (46 a;46b;46 c) having a motor arrangement according to any of the preceding claims and having an outer rotor (32 a;32b;32 c).

13. Method for producing a stator lamination stack (14 a;14b;14 c) for an external rotor motor (46 a;46b;46 c) according to claim 12, characterized in that the stator sheets (14 a;14b;14 c) are connected, in particular adhesively connected, to the stator lamination stack (14 a;14b;14 c) in such a way that the through-openings (12 a;12b;12 c) form cooling channels (16 a;16b;16 c) penetrating the stator lamination stack (14 a;14b;14 c) and that the through-openings (12 a;12b;12 c) of at least two adjacent stator sheets (10 a;10b;10 c) overlap each other only partially, seen in the axial direction (18 a;18b;18 c) of the stator lamination stack (14 a;14b;14 c).