WO2023208774A1

WO2023208774A1 - Two-phase motor, in particular for driving a conveyor belt

Info

Publication number: WO2023208774A1
Application number: PCT/EP2023/060460
Authority: WO
Inventors: Laoun MAGDI; Poliakine JASHA
Original assignee: Dr. Fritz Faulhaber Gmbh & Co. Kg
Priority date: 2022-04-28
Filing date: 2023-04-21
Publication date: 2023-11-02

Abstract

The invention relates to a two-phase motor (1), in particular for driving a conveyor belt, comprising at least one stator (2) and at least one rotor (3), wherein the stator (2) has two stator coils (4) and wherein the rotor (3) has at least one circumferentially arranged outer toothing (5). A two-phase motor (1) is provided, which is very compact while simultaneously having a high holding torque, wherein the stator (2) entirely surrounds the rotor (3) with an inner toothing (5).

Description

Dr. Fritz Faulhaber GmbH & Co. KG, Faulhaberstraße 1, 71101 Schönaich

"Two-phase motor, especially for driving a conveyor belt"

The invention relates to a two-phase motor, in particular for driving a conveyor belt. The motor has at least one stator and at least one rotor. The stator has two stator coils. The rotor has external teeth arranged around it.

Two-phase motors, in particular stepper motors or hybrid stepper motors, are known in the prior art in a variety of configurations. Stepper motors provide excellent torque, especially at low speeds, making a gearbox unnecessary for many applications. Stepper motors are more reliable than comparable servo motors and less susceptible to thermal damage.

Such stepper motors are used, for example, to drive conveyor belts that are used in the production of electrical products and their components or the sorting of components. High demands are placed on generic motors in terms of fine step pitch and high torque. In addition, such engines must meet very high reliability requirements.

US 2018/093833 A1, for example, describes a drive system with a motorized roller, having a secondary stator outside the roller. An outer shell of the roller has electrically conductive or magnetic material to form an induction, permanent magnet or reluctance motor with the secondary stator and to increase the torque of the motor roller. However, the systems known from the prior art have the disadvantage that either the design is too large or the achievable holding torque is too low.

The present invention is therefore based on the object of specifying a two-phase motor which has a very compact design with a high holding torque at the same time.

The aforementioned object is achieved in a generic, two-phase motor according to the characterizing part of claim 1 in that the stator completely surrounds the rotor with internal teeth.

The motor is designed, for example, to drive a conveyor belt, in particular a perforated conveyor belt, or a transport belt. The motor is preferably designed as a stepper motor, in particular as a hybrid stepper motor.

The at least one, in particular exactly one, stator of the motor preferably has at least one stator body. For example, the stator has at least one, preferably central, stator recess, on the inner circumference of which the internal toothing is formed. The internal toothing of the stator has, for example, between 20 and 70 internal teeth, preferably between 40 and 50 internal teeth, in particular exactly 48 internal teeth. The internal toothing completely surrounds the rotor, which means that at least 90% of the outer circumference of the rotor is surrounded by the internal toothing, in particular an internal tooth or an internal tooth space. The length of an internal tooth - extension in the circumferential direction - corresponds, for example, to the length of an internal tooth space. Preferably at least 95%, preferably at least 98%, particularly preferably 100%, of the outer circumference of the rotor is surrounded by the internal toothing, in particular an internal tooth or an internal tooth space. The rotor is advantageously essentially annular and rotatably mounted on at least one bearing ring. The bearing ring preferably has at least one shaft for the output or is coupled to at least one shaft for the output.

The at least one, in particular exactly one, rotor has at least one fully arranged external toothing on its outer circumference. The external toothing - sequence of external teeth and external tooth spaces - is preferably formed on at least 95%, in particular 100%, of the outer circumference of the rotor. The rotor preferably has between 30 and 70 external teeth, preferably between 40 and 60 external teeth, in particular exactly 50 external teeth.

The radial distance between the inner teeth of the stator and the outer teeth of the rotor, also called the air gap, is preferably between approximately 0.05 mm and 0.35 mm, preferably approximately 0.1 mm or 0.2 mm.

The rotor and the stator are designed to be essentially flat. The thickness of the motor - in particular parallel to the axis of rotation of the rotor - or the thickness of the stator and / or the rotor is preferably between 3.5 mm and 9.5 mm, in particular between 5.5 mm and 8 mm. The thickness is particularly preferably 6.5 mm. The thickness of the stator is preferably less than or equal to the thickness of the rotor. The rotor and the stator are advantageously arranged in a common, imaginary plane E. In particular, the stator preferably extends symmetrically to plane E.

The stator in particular has exactly two stator coils - two stator phases. The stator is at least partially wrapped by the stator coils. Each stator coil is preferably arranged on a respective stator core of the stator.

The motor is preferably designed and set up in such a way that a holding torque between 140 mNm and 270 mNm can be generated with the motor, in particular of at least 200 mNm, preferably of at least 250 mNm. The holding torque is particularly preferably approximately 257 mNm.

The motor has the advantage that it has exactly two stator phases to drive the motor. The invention allows the rotor to be driven step by step by alternating two-phase polarization of the two stator coils. The teeth of the preferably polarized rotor align with the inner teeth of the stator, which are at least partially polarized in opposite directions by the stator coils, with each change in the polarity of the stator coils causing the rotor to move further by one tooth width.

The invention is based on the knowledge that increased performance values, in particular an increased holding torque, can be achieved due to the increased number of internal teeth compared to the prior art while maintaining the same size of the stator coils.

Due to the design of the stator, it is possible to further increase the size of the stator coils. This also leads to reduced heating of the engine, which can advantageously prevent the engine from overheating.

In order to advantageously increase the performance data of the motor, in particular the holding torque, according to a first embodiment of the motor it has proven to be advantageous if it is provided that the stator surrounds the motor in one piece. At least in the area surrounding the rotor, the stator is advantageously designed in one piece. The stator surrounds the rotor, in particular completely closed around the circumference. In particular, the two stator coils are arranged on a common stator body, in particular on stator cores of the stator body. For example, it is provided that the stator has at least one, in particular essentially semicircular, recess, preferably at least four recesses, on its inner circumference.

The recesses are preferably arranged evenly or unevenly distributed on the inner circumference. The recesses are arranged in such a way that They minimize or prevent parasitic flow loops. With this configuration, the holding torque of the motor can be significantly increased.

According to an alternative embodiment of the motor, in particular to increase the holding torque, it is provided that the stator is formed from a plurality of stator parts surrounding the rotor. The stator is composed of a plurality of stator parts, in particular surrounding the rotor. The stator parts are separated in particular orthogonally to plane E, so that all stator parts are arranged in particular within the imaginary plane E. Particularly preferably, at least two, in particular exactly two, at least three, in particular exactly three, or at least four, in particular exactly four, stator parts are provided. An embodiment with exactly four stator parts that are arranged symmetrically around the rotor is advantageous. Each stator part has a segment of internal teeth to completely surround the rotor. With this configuration, parasitic flux loops within the stator can be reduced.

According to a further embodiment of the motor, it is provided that the stator parts of the stator lie directly against one another at joints. In the assembled state, the stator parts of the stator are preferably held in such a way that they lie directly against one another at joints. In order to reduce parasitic flux loops, it is in particular provided that non-magnetizable joining parts are inserted at the joining points, so that the stator parts rest against the joining parts on both sides. A joining part is arranged at a joint between two stator parts.

Furthermore, as an alternative to this, it is provided that the stator parts of the stator are arranged at a distance from one another at joints. By providing the joints with a spaced arrangement, parasitic flux loops can be advantageously reduced and the performance data of the motor can be significantly increased. With four stator parts, four joints are preferably provided evenly distributed over the circumference. The width of a joint preferably corresponds to approximately one tooth length, in particular approximately twice the tooth length, preferably approximately three times the tooth length, particularly preferably approximately four times the tooth length. Despite the joints, it is guaranteed that the stator completely surrounds the rotor with internal teeth in the sense of the invention.

According to a further embodiment, it has proven to be particularly advantageous if it is provided that the joints are evenly spaced circumferentially and distributed from one another. With four joints, an angle of approximately 90° is provided between two joints. It is preferably provided that at least one joint is oriented in the direction of a stator coil. The joints oriented in the direction of the stator coils are therefore opposite one another on the circumference. The other two joints - with four joints - are therefore each offset by 90° opposite one another on the inner circumference of the stator.

According to a further embodiment of the motor, it has proven to be advantageous in the case of a stator that surrounds the rotor in one piece if it is provided that the stator - as already briefly described above - has at least one recess for influencing the magnetic flux in the stator. The recess locally reduces the material thickness of the stator or the stator body, thereby influencing the magnetic flux within the stator. It is preferably provided that at least two, in particular exactly two, preferably three, in particular exactly three, particularly preferably four, in particular exactly four, recesses are formed in the stator, in particular for influencing the magnetic flux in the stator.

According to a further embodiment of the motor, it is provided that the recess or recesses is/are introduced into the stator from an outside of the stator. The local reduction in material thickness of the stator therefore occurs from the outside. However, it is particularly preferred that the recess or recesses is/are arranged to locally interrupt the internal toothing of the stator. The recesses are preferably evenly distributed on the inner circumference. For example, if there are four recesses, they are each at a distance of approximately 90° from one another. The recesses are advantageously arranged slightly offset from one another, for example the recesses are arranged at 0°, -89.1°, -180° and -270.9° on the inner circumference. The width of a recess is preferably approximately one tooth length, in particular approximately two tooth lengths, preferably approximately three tooth lengths, particularly preferably approximately four tooth lengths.

The arrangement of the recesses on the inner circumference, so that the internal toothing is locally interrupted or an enlarged internal tooth gap is formed, has the advantage over the prior art that parasitic flow fields within the internal toothing are significantly reduced.

In particular, the assembly of a motor according to the invention can be simplified according to a further embodiment in that each of the two stator coils is wound around a separate stator core. The stator cores are arranged on the stator as part of the stator. For example, the stator cores are attached to the stator in a force-fitting, form-fitting and/or material-locking manner. For example, the stator and the stator cores have corresponding passages so that they can be screwed together. The stator cores are arranged on the stator in particular opposite one another. The stator cores are advantageously arranged in the imaginary plane E.

The stator cores are, for example, essentially designed as flat metal webs. The stator cores, for example, have a significantly greater length than extension in a width and a height direction.

In particular, it is provided that the stator cores and the remaining stator are made of the same material, for example a silicon-iron alloy. are trained. The stator as a whole consists, for example, of a silicon-iron alloy.

For example, the stator cores are made of a first material and the remaining stator is made of at least a second material, the first material and the second material being different.

It is preferably provided that the first material and the second material have different magnetic permeability. For example, the second material is a silicon-iron alloy and/or the first material is a nickel-iron alloy or a cobalt-iron alloy. The magnetic permeability of the first material is advantageously greater than that of the second material. This can advantageously achieve higher saturation for the motor and thus a higher holding torque.

According to a further embodiment, the arrangement of the stator coils on the stator can be simplified in that the stator has at least two receiving recesses for the stator coils, and in that two receiving areas are formed on each receiving recess for receiving the opposite ends of a stator core. The stator cores are consequently arranged on the stator in such a way that each stator core at least partially projects beyond a receiving recess and is attached to the stator at its ends. The stator coil is preferably wound in the part of a stator core that projects beyond the receiving recess.

In particular, it is provided that each stator core joins two stator parts together, in particular in that each stator core is connected to two stator parts in a force-fitting, positive and/or material-locking manner.

According to a further embodiment of the motor, the mounting of the stator cores can be simplified in that each receiving area has at least two receiving wings, which at least partially overlap a stator core on the front and back. For example, there are one on each side At least two receiving wings are provided in the receiving recess. The distance between the receiving wings corresponds approximately to the thickness of a stator core. Each end side of a stator core is inserted between two receiving wings, so that each stator core is affected by the receiving wings on the front and back. The receiving wings are arranged in particular above and below the imaginary plane E. For example, it is provided that each stator core is connected to the receiving wings in a force-fitting, positive and/or material-locking manner.

Furthermore, according to a further embodiment, it is provided that the stator cores have at least one laterally arranged stator core recess at the end. It is preferably provided that each stator core has at least two laterally arranged stator core recesses in the area of each of its end sides, outside the area in which the stator coil is arranged. When assembled, the stator core recesses are preferably aligned in the direction of the stator recess in the stator with the internal teeth.

According to a further embodiment, the installation space for the motor can be reduced in that the stator - as described above - is designed as a substantially flat body. In this way, for example, a plurality of motors can be arranged close to one another.

In particular, in order to achieve a very fine step pitch, it has proven to be advantageous according to a further embodiment if it is provided that the rotor has at least one magnetic rotor disk and at least two iron rotor disks in a sandwich construction. The magnetic rotor disk is preferably arranged between the two iron rotor disks. The magnetic rotor disk and the two iron rotor disks are preferably mounted together on the bearing ring. The iron rotor disks each have external teeth. The external teeth of the iron rotor disks are arranged offset from one another, so that the external teeth of a first iron rotor disk each cover the gaps between the external teeth of a second iron rotor disk. One of the iron rotor disks conducts preferably the magnetic north pole of the magnetic rotor disk, the second of the iron rotor disks the magnetic south pole.

This arrangement advantageously allows a step-by-step rotary drive of the rotor through alternating two-phase polarization of the two stator coils. The teeth of the polarized iron rotor disks align with the oppositely polarized inner teeth of the stator, with each change in the polarity of the stator phases causing the two iron rotor disks to move forward by one tooth length.

According to a first aspect, the invention relates to a two-phase motor, in particular for driving a conveyor belt, having at least one stator and at least one rotor, the stator having two stator coils, the stator coils at least partially surrounding the stator, the rotor having external teeth arranged around it having. The motor is characterized in that the stator is formed in one piece surrounding the rotor. Further refinements of the engine result from the exemplary embodiments described above and the subclaims dependent on claim 1.

According to a second aspect, the invention relates to a two-phase motor, in particular for driving a conveyor belt, having at least one stator and at least one rotor, the stator having two stator coils, the stator coils at least partially surrounding the stator, the rotor having external teeth arranged continuously having. The motor is characterized in that the stator is formed from four stator parts surrounding the rotor, in particular that two stator parts are assigned to a stator phase, preferably that the four stator parts are arranged in a common, imaginary plane E. Further refinements of the engine result from the exemplary embodiments described above and the subclaims dependent on claim 1. A third aspect of the invention relates to a method for assembling a two-phase motor, in particular a hybrid stepper motor, preferably according to one of the exemplary embodiments described above, at least comprising the following method steps:

Wrapping around two, in particular web-shaped, separate stator cores, each with a stator coil,

Arranging the stator cores with the stator coils on a stator, in particular from opposite sides in an imaginary plane E, by inserting the stator coils into receiving recesses on the stator and attaching the stator cores at their ends to the stator, preferably non-positively, positively and/or materially. be attached.

This method has the advantage that the effort required to produce the stator coils and assemble them on the stator is significantly reduced.

A further aspect of the invention relates to a motor, preferably a two-phase motor, in particular for driving a conveyor belt, having at least one stator and at least one rotor, the stator having at least two stator coils, the rotor having at least one external toothing arranged continuously. The motor is characterized in that the stator completely surrounds the rotor with internal teeth. Further embodiments of the engine result from the feature content of the dependent claims.

Further advantageous embodiments of the invention result from the following description of the figures and the dependent subclaims.

Show it:

1 shows an exemplary embodiment of a two-phase motor, 2 shows the exemplary embodiment of a two-phase motor according to FIG. 1 in an exploded view,

3 shows the exemplary embodiment of a two-phase motor according to FIGS. 1 and 2 in a top view,

4 shows a further exemplary embodiment of a two-phase motor in plan view,

5 shows a schematic sequence of a described method and

Fig. 6 shows an embodiment of a two-phase motor in an exploded view.

In the various figures of the drawing, the same parts are always provided with the same reference numbers.

The following description claims that the invention is not limited to the exemplary embodiments and not to all or several features of the combinations of features described, but rather each individual partial feature of the/each exemplary embodiment is also detached from all other partial features described in connection therewith also in combination with any features of another exemplary embodiment of importance for the subject matter of the invention.

1, 2 and 3 show an exemplary embodiment of a two-phase motor 1. Fig. 1 shows the assembled engine 1 in a perspective view. FIG. 2 shows the motor 1 in an exploded view and FIG. 3 shows the motor 1 in a plan view along the axis of rotation R of the rotor 3 or the motor 1. The motor 1 is intended to drive a conveyor belt. The motor 1 has at least one stator 2 and at least one rotor 3. The stator 2 here has exactly two stator coils 4 - two stator phases - which are wound around the stator 2. The Rotor 3 has at least one external toothing 5. The rotor 3 is arranged in a stator recess 6, which has an internal toothing 7 that completely surrounds the rotor 3 on its inner circumference.

According to FIGS. 1 to 3, the stator 2 surrounds the rotor 3 in one piece. The stator recess 6 is therefore completely closed circumferentially. During operation, the rotor 3 rotates in an imaginary plane E - the rotor plane in which the stator 2 is also arranged.

4 shows an alternative embodiment of a two-phase motor 1 in a top view, parallel to the axis of rotation R. The rotor 3 is designed identically to the embodiment of FIGS. 1 to 3. In this exemplary embodiment, the stator 2 has a plurality, here four, of stator parts 2a. The stator parts 2a form the stator recess 6. The internal toothing 7, which completely surrounds the rotor, is arranged on the stator parts 2a. Two stator parts 2a are assigned to a stator coil 4.

Joints 8 are provided between the stator parts 2a of the stator 2, at which the stator parts 2a are arranged at a distance from one another. The maximum width of a joint 8 corresponds approximately to three times the tooth length of an external tooth of the external toothing 5 of the rotor 3. The tooth length is the extent of an external tooth in the circumferential direction. Despite the joints 8, the internal toothing 7 completely surrounds the outer circumference of the rotor 3, here on more than 95% of the outer circumference of the rotor 3. The joints 8 are arranged evenly distributed around the circumference. An angle of approximately 90° is formed between the joints 8. All four stator parts 2a are arranged in the imaginary plane E.

The joints 8 are arranged in such a way that two joints 8 are aligned in the direction of the stator coils 4 and the further joints 8 are arranged at an angle of approximately 90 ° to them, so that they extend upwards and downwards as shown in FIG. In contrast to the exemplary embodiment of FIG. 4, the stator 2 in the exemplary embodiment of FIGS. 1, 2 and 3 is designed to be circumferentially closed in the vicinity of the stator recess 6. In order to reduce parasitic flux fields, the stator 2 has four recesses 9 distributed slightly offset from one another over the circumference on the inner circumference of the stator recess 6. The recesses 9 locally reduce a wall thickness of the stator 2, whereby the magnetic flux in the stator 2 is influenced and in particular parasitic flux fields are minimized. Two of the recesses 9 are each essentially aligned in the direction of a stator coil 4, while the other two recesses 9 are arranged at an angle of approximately 90 ° to it, i.e. extend upwards and downwards as shown in FIG. The recesses are arranged slightly offset from one another, so that the recesses according to FIG. 4 are arranged at 0°, -89.1°, -180° and -270.9° on the inner circumference. The recesses 9 only interrupt the internal toothing 7 locally, so that the rotor 3 is nevertheless completely surrounded by the internal toothing 7. The internal toothing 7, in particular an internal tooth or an internal tooth space, is provided on at least 95% of the outer circumference of the rotor 3. The recesses 9 have a maximum length - in the circumferential direction - of approximately three internal tooth lengths.

In all exemplary embodiments according to FIGS. 1 to 4 , each of the stator coils 4 is wound around a stator core 10. The stator cores 10 are designed as flat webs with a substantially rectangular cross section. The stator cores 10 are arranged as part of the stator 2 on the stator 2 and, in this exemplary embodiment, are attached to the stator 2 in a form-fitting manner. Alternatively or additionally, it is also provided that the stator cores 10 are connected to the stator 2 in a force-fitting and/or material-locking manner. The stator 2 and the stator cores 10 have bushings 11. The bushings 11 serve to fasten the stator cores 10, for example by means of a screw or a pressed cylinder pin, to the stator 2 and to fasten the stator 2 with the stator cores 10 to a motor housing - not shown. In order to accommodate the stator coils 4 in the stator 2, each stator 2 has at least two receiving recesses 12 in all exemplary embodiments according to FIGS. 1 to 4. The receiving recesses 12 are at least partially invaded by the stator cores 10 in the assembled state. The receiving recesses 12 are arranged opposite one another in the plane E. At each receiving recess 12, two receiving areas 13 are provided for receiving one end of a stator core 10. In these exemplary embodiments, each receiving area 13 has two receiving wings 14 which engage over a stator core 10 on the front and back. Each of the stator cores 10 has at least two laterally arranged stator core recesses 15 at each end, which are aligned with the rotor 3 or the stator recesses 6 in the assembled state. The stator core recesses 15 serve to simplify the assembly of the stator cores 10 on the stator 2. The stator 2 advantageously has a shape corresponding to the stator core recesses 15. The rotor 3 and the stator 2 are designed as essentially flat bodies so that they extend in an imaginary, common plane E.

In all exemplary embodiments of FIGS. 1 to 4, the rotor 3 has a magnetic rotor disk 3a, shown by way of example in FIG. 2, and two iron rotor disks 3b. The magnetic rotor disk 3a is arranged as a sandwich construction between the iron rotor disks 3b. The magnetic rotor disk 3a and the two iron rotor disks 3b are mounted on a bearing ring 3c. The magnetic rotor disk 3a and the iron rotor disks 3b are essentially annular with a central recess 16 for receiving the bearing ring 3c. Each of the iron rotor disks 3b has external teeth 5 on its outer circumference, which together form the external teeth 5 of the rotor 3. The external teeth of the external teeth 5 of the two iron rotor disks 3b are arranged rotationally offset from one another, so that an external tooth of one disk 3b - viewed parallel to the axis of rotation R - covers an external tooth space of the other iron rotor disk 3b. In all exemplary embodiments of FIGS. 1 to 4, the stator 2 is essentially cassette-shaped with rounded corner regions. The stator cores 10, which are arranged on opposite end sides of the stator 2, as part of the stator 2, have correspondingly rounded corner regions 10a, which are flush with the corner regions of the stator 2 in the assembled state.

5 shows an example of a schematic sequence of a method 100 for assembling a two-phase motor 1, in particular a hybrid stepper motor. First, two, in particular web-shaped, separate stator cores 10 - see also Fig. 2 - are wrapped around 101, each with a stator coil 4. Subsequently, the stator cores 10 with the stator coils 4 are arranged on a stator 2, in particular from opposite sides in one imaginary level E, by inserting the stator coils 4 into receiving recesses 12 on the stator 2 and attaching the stator cores 10 at their ends to the stator 2, preferably non-positively, positively and / or materially. The arrangement 102 is preferably carried out in a direction towards the stator recess 6 or the rotor 3 - see FIG. 2 as an example. Each end of a stator core 10 is arranged in particular in a receiving area 13 - see FIG. 2 for example - between two receiving wings 14 and fastened there.

Fig. 6 shows an exemplary embodiment of a two-phase motor 1 in an exploded view. The exemplary embodiment essentially corresponds to the exemplary embodiment of FIGS. 1 and 2, so that reference is made to the relevant statements. The difference is that the stator cores 10 have no stator core recesses 15 - see e.g. B. Fig. 2 - have. The stator cores 10 in particular have a substantially constant cross section.

The invention is not limited to the exemplary embodiments shown and described, but also includes all embodiments that have the same effect within the meaning of the invention. It is expressly emphasized that the exemplary embodiments are not limited to all features in combination; rather, each individual partial feature can also be used separately from all others Partial features have an inventive significance in themselves. Furthermore, the invention has not yet been limited to the combination of features defined in claim 1, but can also be defined by any other combination of certain features of all of the individual features disclosed overall. This means that, in principle, practically every individual feature of claim 1 can be omitted or replaced by at least one individual feature disclosed elsewhere in the application.

Reference character list

1 engine

2 stators

2a stator part

3 rotor

3a Magnetic rotor disk

3b iron rotor disk

3c bearing ring

4 stator coil

5 external teeth

6 stator recess

7 internal teeth

8 joints

9 recess

10 stator core

10a corner area

11 Implementation

12 receiving recess

13 recording area

14 recording wings

15 stator core recess

16 Central recess

100 procedures

101 wrapping

102 Arrange

E level

R rotation axis

Claims

Expectations

1 . Two-phase motor (1), in particular for driving a conveyor belt, having at least one stator (2) and at least one rotor (3), the stator (2) having two stator coils (4), the rotor (3) rotating at least one arranged external teeth (5), characterized in that the stator (2) completely surrounds the rotor (3) with internal teeth (5).

2. Two-phase motor (1) according to claim 1, characterized in that the stator (2) surrounds the rotor (3) in one piece.

3. Two-phase motor (1) according to claim 1, characterized in that the stator (2) surrounding the rotor (3) is formed from a plurality of stator parts (2a), in particular from at least two stator parts (2a), at least three stator parts ( 2a) or at least four stator parts (2a).

4. Two-phase motor (1) according to claim 3, characterized in that the stator parts (2a) of the stator (2) lie directly against one another at joints (8), or that the stator parts (2a) of the stator (2) with an interposed joining part rest against each other, or that the stator parts (2a) of the stator (2) are arranged spaced apart from one another at joints (8). Two-phase motor (1) according to claim 4, characterized in that the joints (8), in particular four joints (8), are arranged evenly distributed around the circumference, preferably that at least one joint (8) is oriented in the direction of a stator coil (4). . Two-phase motor (1) according to one of claims 1 to 5, characterized in that the stator (2) has at least one recess (9), preferably at least or exactly two, preferably at least or exactly three, particularly preferably at least or exactly four, recesses ( 9), in particular for influencing the magnetic flux in the stator (2), two-phase motor (1) according to claim 6, characterized in that the recess (9) or the recesses (9) is formed starting from an outside of the stator (2). are and/or that the recess (9) or the recesses (9) are arranged to interrupt the internal toothing (7), advantageously that the recesses (9) are approximately evenly spaced from one another. Two-phase motor (1) according to one of claims 1 to 7, characterized in that each of the stator coils (4) is wound around a stator core (10), and that the stator cores (10) as part of the stator (2) on the stator ( 2) are arranged, in particular that the stator cores (10) are attached to the stator (2) in a force-fitting, positive and/or material-locking manner. Two-phase motor (1) according to one of claims 1 to 8, characterized in that the stator (2) has at least two receiving recesses (12) for the stator coils (4), and that two receiving areas (13) are provided on each receiving recess (12). Recording of opposite ends of a stator core (10) are formed. Two-phase motor (1) according to claim 9, characterized in that each receiving area (13) has at least two receiving wings (14) which engage over a stator core (10) on the front and back. Two-phase motor (1) according to one of claims 8 to 10, characterized in that the stator cores (10) have at least one laterally arranged stator core recess (15) at the end, in particular at least two laterally arranged stator core recesses (15) on each end side. Two-phase motor (1) according to one of claims 1 to 11, characterized in that the stator (2) and the rotor (3) are arranged in a common, imaginary plane (E), in particular that the rotor (3) is in the plane (E) is held rotatably. Two-phase motor (1) according to one of claims 1 to 12, characterized in that the rotor (3) has at least one magnetic rotor disk (3a) and at least two iron rotor disks (3b) in a sandwich construction.