Two-phase motor, especially for driving a conveyor belt

Abstract

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), wherein the rotor (3) has at least one circumferentially arranged external toothing (5), the stator (2) fully surrounds the rotor (3) with an internal toothing (5), the stator (2) has at least two receiving recesses (12) for the stator coils (4), and at each receiving recess (12) two receiving areas (13) for receiving opposite ends of a stator core (10) are formed, characterized in that each receiving area (13) has at least two receiving wings (14) which overlap a stator core (10) from the front and rear.

Description

[0001] 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 a circumferential external toothing.

[0002] Two-phase motors, especially stepper motors or hybrid stepper motors, are known in the art in a wide variety of configurations. Stepper motors offer excellent torque, particularly 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.

[0003] Stepper motors of this type are used, for example, to drive conveyor belts in the production of electrical products and their components, or in the sorting of parts. These motors are subject to high demands regarding fine step increments and high torque. Furthermore, they must meet very high reliability requirements.

[0004] US 2018 / 093833 A1, for example, describes a drive system with a motorized roller, comprising a secondary stator located 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 motorized roller.

[0005] US 5,729,071 A describes a multi-pole electric motor with a stator and a rotor. The rotor has external teeth and the stator has internal teeth.

[0006] A stator made of laminated plates is known from GB 2 419 474 A. Each plate has an opening for the rotor. Furthermore, each plate has open ends that accommodate coils.

[0007] JP 2016-144 336 A relates to a stepper motor and a clock. The stepper motor has a stator with small teeth and a rotor with small teeth.

[0008] 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.

[0009] The present invention is therefore based on the objective of providing a two-phase motor that has a very compact design while simultaneously providing high holding torque.

[0010] The aforementioned problem is solved in a generic, two-phase motor according to the characterizing part of claim 1 by the fact that the stator completely surrounds the rotor with an internal toothing.

[0011] 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.

[0012] The at least one, and 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 teeth are formed. The internal teeth of the stator have, for example, between 20 and 70 internal teeth, preferably between 40 and 50 internal teeth, and in particular exactly 48 internal teeth. The internal teeth completely surround the rotor, meaning that at least 90% of the outer circumference of the rotor is surrounded by the internal teeth, in particular an internal tooth or an internal tooth gap. The length of an internal tooth – its circumferential extent – ​​corresponds, for example, to the length of an internal tooth gap. Preferably, at least 95%, more preferably at least 98%, and most preferably 100% of the outer circumference of the rotor is surrounded by the internal teeth, in particular an internal tooth or an internal tooth gap.

[0013] The rotor is advantageously essentially ring-shaped and rotatably mounted on at least one bearing ring. The bearing ring preferably has at least one output shaft or is coupled to at least one output shaft.

[0014] The at least one, and in particular exactly one, rotor has at least one external toothing extending around its entire circumference. The external toothing – a sequence of external teeth and interspaces – preferably covers at least 95%, and in particular 100%, of the rotor's outer circumference. The rotor preferably has between 30 and 70 external teeth, more preferably between 40 and 60 external teeth, and in particular exactly 50 external teeth.

[0015] 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 0.05 mm and 0.35 mm, preferably about 0.1 mm or 0.2 mm.

[0016] The rotor and stator are essentially flat in design. The thickness of the motor—particularly parallel to the rotor's axis of rotation—or the thickness of the stator and / or rotor, is preferably between 3.5 mm and 9.5 mm, and more preferably between 5.5 mm and 8 mm. A thickness of 6.5 mm is especially preferred. The stator thickness is preferably less than or equal to the rotor thickness. The rotor and stator are advantageously arranged in a common, imaginary plane E. In particular, the stator preferably extends symmetrically to plane E.

[0017] The stator has exactly two stator coils – two stator phases. The stator is at least partially wound by the stator coils. Preferably, each stator coil is arranged on a separate stator core of the stator.

[0018] The motor is preferably designed and configured such that it can generate a holding torque between 140 mNm and 270 mNm, in particular at least 200 mNm, preferably at least 250 mNm. Particularly preferably, the holding torque is approximately 257 mNm.

[0019] The motor has the advantage of having exactly two stator phases for driving the motor. The invention allows for a stepwise drive of the rotor 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 the opposite direction by the stator coils, with the rotor advancing by one tooth width with each change in the polarity of the stator coils.

[0020] The invention is based on the finding that, compared to the prior art, an increased number of internal teeth allows for improved performance values, in particular an increased holding torque, while maintaining the same size of the stator coils.

[0021] The stator design allows for a further increase in the size of the stator coils. This also leads to reduced motor heating, thus effectively preventing overheating.

[0022] To advantageously increase the motor's performance, particularly its holding torque, a first embodiment of the motor has proven beneficial if the stator integrally surrounds the motor. At least in the area surrounding the rotor, the stator is advantageously formed as a single piece. The stator, in particular, completely encloses the rotor. Specifically, the two stator coils are arranged on a common stator body, especially on stator cores of the stator body. For example, the stator is provided with at least one, preferably substantially semicircular, recess on its inner circumference, and preferably at least four recesses. Preferably, the recesses are arranged evenly or unevenly distributed around the inner circumference. The recesses are arranged such that they minimize or prevent parasitic flux loops.This design allows the holding torque of the motor to be significantly increased.

[0023] According to an alternative embodiment of the motor, particularly for increasing the holding torque, the stator is formed from a plurality of stator parts surrounding the rotor. The stator is specifically composed of a plurality of stator parts surrounding the rotor. The stator parts are separated orthogonally to plane E, so that all stator parts are arranged within the imaginary plane E. 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 particularly preferred. An embodiment with exactly four stator parts arranged symmetrically around the rotor is advantageous. Each stator part has a segment of internal teeth to completely surround the rotor. This embodiment reduces parasitic flux loops within the stator.

[0024] According to a further embodiment of the motor, the stator sections are in direct contact with each other at the joints. In the assembled state, the stator sections are preferably held in such a way that they are in direct contact with each other at the joints. To reduce parasitic flux loops, it is particularly important that non-magnetizable joining elements are inserted at the joints, so that the stator sections are in contact with the joining elements on both sides. A joining element is arranged between each pair of stator sections at each joint.

[0025] Alternatively, the stator components can be arranged with a distance between them at the joints. By providing these joints with a distance between them, parasitic flux loops can be advantageously reduced and the motor's performance significantly improved.

[0026] In the case of four stator parts, four joining points are preferably provided, evenly distributed around the circumference. The width of a joining point preferably corresponds to approximately one tooth length, more preferably approximately twice the tooth length, more preferably approximately three times the tooth length, and most preferably approximately four times the tooth length. Despite the joining points, it is ensured that the stator completely surrounds the rotor with internal teeth in accordance with the invention.

[0027] According to a further embodiment, it has proven particularly advantageous if the joining points are arranged with uniform spacing and distribution around the circumference. With four joining points, an angle of approximately 90° is provided between any two joining points. Preferably, at least one joining point is oriented towards a stator coil. The joining points oriented towards the stator coils are therefore located opposite each other on the circumference. The other two joining points – in the case of four joining points – are therefore located opposite each other on the inner circumference of the stator, offset by 90°.

[0028] In a further embodiment of the motor, it has proven advantageous for a stator that integrally surrounds the rotor if the stator—as briefly described above—has at least one recess for influencing the magnetic flux within the stator. This recess locally reduces the material thickness of the stator or stator body, thereby influencing the magnetic flux within the stator. Preferably, at least two, in particular exactly two, more preferably three, in particular exactly three, and more preferably four, in particular exactly four, recesses are formed in the stator, specifically for influencing the magnetic flux within the stator.

[0029] According to a further embodiment of the motor, the recess(s) is / are formed in the stator from an outer surface. The local reduction of the stator's material thickness thus occurs from the outside. However, it is particularly preferred that the recess(s) is / are arranged to locally interrupt the internal teeth of the stator. The recesses are preferably evenly distributed around the inner circumference. For example, if there are four recesses, they are spaced approximately 90° apart. Advantageously, the recesses are arranged slightly offset from one another; for example, the recesses are located at 0°, -89.1°, -180°, and -270.9° on the inner circumference. The width of a recess is preferably about one tooth length, more preferably about two tooth lengths, more preferably about three tooth lengths, and most preferably about four tooth lengths.

[0030] 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.

[0031] In particular, the assembly of a motor according to the invention can be simplified according to a further embodiment by winding each of the two stator coils 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 by force-fit, form-fit, and / or material-fit. For example, the stator and the stator cores have corresponding through-holes so that they can be screwed together. The stator cores are arranged on the stator, preferably opposite each other. The stator cores are advantageously arranged in the imaginary plane E.

[0032] The stator cores, for example, are essentially designed as flat metal struts. The stator cores have a significantly greater length than they do width or height.

[0033] It is specifically stipulated that the stator cores and the remaining stator are made of the same material, for example, a silicon-iron alloy. The stator as a whole consists, for example, of a silicon-iron alloy.

[0034] For example, the stator cores are made of a first material, and the remaining stator is made of at least one second material, wherein the first and second materials are different. It is preferably provided that the first and second materials have different magnetic permeabilities. 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. Advantageously, the magnetic permeability of the first material is greater than that of the second material. This advantageously allows for higher saturation of the motor and thus a higher holding torque.

[0035] The arrangement of the stator coils on the stator can be simplified by providing the stator with at least two receiving recesses for the stator coils, and by forming two receiving areas on each receiving recess to accommodate the opposite ends of a stator core. The stator cores are thus arranged on the stator such that each stator core at least partially extends beyond a receiving recess and is attached to the stator at its ends. The stator coil is preferably wound in the portion of the stator core that extends beyond the receiving recess.

[0036] In particular, it is provided that each stator core joins two stator parts together, especially by connecting each stator core to two stator parts by force, form and / or material connection.

[0037] Mounting the stator cores can be simplified by providing each receiving area with at least two receiving wings that partially overlap the front and rear of the stator core. For example, at least two receiving wings are provided on each side of a receiving recess. The distance between the receiving wings corresponds approximately to the thickness of a stator core. Each end of a stator core is positioned between two receiving wings, so that each stator core is overlapped by the receiving wings on both the front and rear sides. 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 by force-fit, form-fit, and / or material-fit.

[0038] Furthermore, according to a further embodiment, the stator cores have at least one laterally arranged stator core recess at their end. Preferably, each stator core has at least two laterally arranged stator core recesses in the region of each of its end faces, outside the area where the stator coil is arranged. In the assembled state, the stator core recesses are preferably aligned with the stator recess in the stator with the internal teeth.

[0039] According to a further embodiment, the installation space for the motor can be reduced by designing the stator – as described above – as a substantially flat body. In this way, for example, multiple motors can be arranged close together.

[0040] Particularly to achieve very fine pitch increments, a further embodiment has proven advantageous in which the rotor comprises 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. Each iron rotor disk has external teeth. The external teeth of the iron rotor disks are offset from one another, so that the external teeth of a first iron rotor disk overlap the gaps between the external teeth of a second iron rotor disk. One of the iron rotor disks preferably conducts the magnetic north pole of the magnetic rotor disk, and the second of the iron rotor disks the magnetic south pole.

[0041] This arrangement advantageously allows for a stepwise rotary drive of the rotor by 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 the two iron rotor disks advancing by one tooth length with each change in the polarity of the stator phases.

[0042] According to a first aspect, the invention relates to a two-phase motor, in particular for driving a conveyor belt, comprising at least one stator and at least one rotor, wherein the stator has two stator coils, the stator coils at least partially surrounding the stator, and the rotor having circumferential external teeth. The motor is characterized in that the stator is formed integrally with the rotor. Further embodiments of the motor are described in the exemplary embodiments described above and in the dependent claims.

[0043] According to a second aspect, the invention relates to a two-phase motor, in particular for driving a conveyor belt, comprising at least one stator and at least one rotor, wherein the stator has two stator coils, the stator coils at least partially surrounding the stator, and the rotor having circumferential external teeth. The motor is characterized in that the stator is formed from four stator parts circumferentially surrounding the rotor, in particular that two stator parts are assigned to each stator phase, preferably that the four stator parts are arranged in a common, imaginary plane E. Further embodiments of the motor are described in the exemplary embodiments described above and in the dependent claims of claim 1.

[0044] 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 embodiments described above, comprising at least the following method steps: - Winding two, especially 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 to the stator at their ends, preferably by force-fit, form-fit and / or material-fit.

[0045] This method has the advantage that the effort required for manufacturing the stator coils and mounting them on the stator is significantly reduced.

[0046] Further advantageous embodiments of the invention will become apparent from the following description of the figures and the dependent subclaims.

[0047] They show: Fig. 1 an embodiment of a two-phase motor, Fig. 2 the embodiment of a two-phase motor according to Fig. 1 in an exploded view, Fig. 3 the embodiment of a two-phase motor according to Fig. 1 and Fig. 2 in a top view, Fig. 4 Another embodiment of a two-phase motor in top view, Fig. 5 a schematic sequence of a described procedure and Fig. 6 An embodiment of a two-phase motor in an exploded view.

[0048] In the various figures of the drawing, identical parts are always labelled with the same reference symbols.

[0049] The following description claims that the invention is not limited to the exemplary embodiments and not to all or several features of the described combinations of features; rather, each individual partial feature of the exemplary embodiment(s) is also significant for the subject matter of the invention, independent of all other partial features described in connection therewith, both on its own and in combination with any features of another exemplary embodiment.

[0050] Fig. 1, Fig. 2 and Fig. Figure 3 shows an embodiment of a two-phase motor 1. Fig. Figure 1 shows the assembled motor 1 in a perspective view. Fig. Figure 2 shows the motor 1 in an exploded view and Fig. Figure 3 shows a top view of motor 1 along the axis of rotation R of rotor 3 and motor 1. Motor 1 is designed to drive a conveyor belt. Motor 1 has at least one stator 2 and at least one rotor 3. Stator 2 has exactly two stator coils 4 – two stator phases – wound around it. Rotor 3 has at least one external toothing 5. Rotor 3 is arranged in a stator recess 6, which has internal toothing 7 on its inner circumference that completely surrounds rotor 3.

[0051] According to Fig. 1 to Fig. The stator 2 completely surrounds the rotor 3 in one piece. The stator recess 6 is therefore completely enclosed. During operation, the rotor 3 rotates in an imaginary plane E – the rotor plane – in which the stator 2 is also located.

[0052] Fig. Figure 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 identical to that in the embodiment of the Fig. 1 to 3. In this embodiment, the stator 2 has a plurality, here four, of stator parts 2a. The stator parts 2a form the stator recess 6. The internal teeth 7, which completely surround the rotor, are arranged on the stator parts 2a. Two stator parts 2a are assigned to each stator coil 4.

[0053] Joining points 8 are provided between the stator sections 2a of the stator 2, at which the stator sections 2a are arranged at intervals from one another. The maximum width of a joining point 8 corresponds approximately to three times the tooth length of an outer tooth of the external gearing 5 of the rotor 3. The tooth length is the circumferential extent of an outer tooth. Despite the joining points 8, the internal gearing 7 completely surrounds the outer circumference of the rotor 3, here covering more than 95% of the outer circumference of the rotor 3. The joining points 8 are arranged uniformly around the circumference. An angle of approximately 90° is formed between the joining points 8. All four stator sections 2a are arranged in the imaginary plane E.

[0054] The joining points 8 are arranged such that two joining points 8 are aligned in the direction of the stator coils 4 and the other joining points 8 are arranged at an angle of approximately 90° to them, so that they are aligned according to Fig. 4 extend upwards and downwards.

[0055] In contrast to the embodiment of the Fig. 4 is the stator 2 in the exemplary embodiment of the Fig. 1, Fig. 2 and Fig. 3 in the vicinity of the stator recess 6 is fully enclosed. To reduce parasitic flux fields, the stator 2 has four recesses 9 distributed slightly offset from one another around the circumference of the stator recess 6. The recesses 9 locally reduce the wall thickness of the stator 2, thereby influencing the magnetic flux in the stator 2 and, in particular, minimizing parasitic flux fields. Two of the recesses 9 are each oriented substantially towards a stator coil 4, while the other two recesses 9 are arranged at an angle of approximately 90° to it, i.e., according to Fig. 4 extend upwards and downwards. The recesses are arranged slightly offset from each other, so that the recesses according to Fig. The recesses 9 are arranged at 0°, -89.1°, -180°, and -270.9° on the inner circumference. The recesses 9 interrupt the internal teeth 7 only locally, so that the rotor 3 is nevertheless completely surrounded by the internal teeth 7. The internal teeth 7, in particular an internal tooth or an internal tooth gap, are 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.

[0056] In all embodiments according to the Fig. 1 to Fig. In this embodiment, 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 and, in this embodiment, are positively locked to the stator 2. Alternatively or additionally, it is also provided that the stator cores 10 are frictionally locked and / or materially bonded to the stator 2. The stator 2 and the stator cores 10 have feedthroughs 11. The feedthroughs 11 serve to fasten the stator cores 10 to the stator 2, for example by means of a screw or a pressed-in cylindrical pin, and to fasten the stator 2 with the stator cores 10 to a motor housing (not shown).

[0057] In order to accommodate the stator coils 4 in the stator 2, each stator 2 in all embodiments according to Fig. 1 to Fig. 4. The stator 2 has at least two receiving recesses 12. In the assembled state, the receiving recesses 12 are at least partially overlapped by the stator cores 10. The receiving recesses 12 are arranged opposite each other in plane E. Each receiving recess 12 has two receiving areas 13 for receiving one end of a stator core 10. In these embodiments, each receiving area 13 has two receiving wings 14 that overlap a stator core 10 from the front and rear. Each stator core 10 has at least two laterally arranged stator core recesses 15 at each end, which, in the assembled state, are aligned with the rotor 3 or the stator recesses 6. The stator core recesses 15 simplify the assembly of the stator cores 10 onto 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.

[0058] In all embodiments of the Fig. 1 to Fig. 4 the rotor 3 shows an exemplary in Fig. Figure 2 shows a magnetic rotor disk 3a 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 ring-shaped 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 each other, such that each external tooth of one disk 3b – viewed parallel to the axis of rotation R – covers an external tooth gap of the other iron rotor disk 3b.

[0059] In all embodiments of the Fig. 1 to Fig. 4 The stator 2 is essentially cassette-shaped with rounded corner regions. The stator cores 10, which are arranged at opposite end faces of the stator 2 as part of the stator 2, have correspondingly rounded corner regions 10a that are flush with the corner regions of the stator 2 in the assembled state.

[0060] Fig. Figure 5 shows an exemplary 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 are wound 101 – see also Fig. 2 - each with a stator coil 4. Subsequently, the stator cores 10 with the stator coils 4 are arranged 102 on a stator 2, in particular from opposite sides in an imaginary plane 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 by force-fit, form-fit and / or material-fit. The arrangement 102 is preferably carried out in one direction towards the stator recess 6 or the rotor 3 - see example. Fig. 2 - to. Each end of a stator core 10 is in particular in a receiving area 13 - see example. Fig. 2 - arranged between two receiving wings 14 and attached there.

[0061] Fig. Figure 6 shows an embodiment of a two-phase motor 1 in an exploded view. This embodiment essentially corresponds to the embodiment of the Fig. 1 and Fig. 2, so reference is made to the relevant explanations. The difference is that the stator cores 10 do not have stator core recesses 15 - see e.g. Fig. 2 - exhibit. The stator cores 10 in particular have a substantially constant cross-section.

[0062] The invention is not limited to the embodiments illustrated and described, but also encompasses all embodiments that have the same effect within the meaning of the invention. It is expressly emphasized that the embodiments are not limited to all features in combination; rather, each individual feature can also have inventive significance independently of all other features. Furthermore, the invention is not yet limited to the combination of features defined in claim 1, but can also be defined by any other combination of specific features from all disclosed individual features. This means that, in principle, virtually any individual feature of claim 1 can be omitted or replaced by at least one individual feature disclosed elsewhere in the application. Reference symbol list 1 engine 2 Stator 2a Stator part 3 Rotor 3a Magnetic rotor disc 3b Iron rotor disc 3c bearing ring 4 Stator coil 5 External teeth 6 Stator recess 7 Internal teeth 8 joint 9 Exclusion 10 Stator core 10a Corner area 11 Implementation 12. Admission exemption 13 Recording area 14 receiving wings 15 Stator core recess 16 Central recess 100 procedures 101 Wrapping 102 Arrange Level E R axis of rotation

Claims

[1] 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), wherein the rotor (3) has at least one circumferentially arranged external toothing (5), the stator (2) fully surrounds the rotor (3) with internal toothing (5), the stator (2) has at least two receiving recesses (12) for the stator coils (4), and at each receiving recess (12) two receiving areas (13) for receiving opposite ends of a stator core (10) are formed, characterized by , that each receiving area (13) has at least two receiving wings (14) that overlap a stator core (10) from the front and rear. [2] Two-phase motor (1) according to claim 1, characterized by , that the stator (2) surrounds the rotor (3) in one piece. [3] Two-phase motor (1) according to claim 1, characterized by, 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 by , that the stator parts (2a) of the stator (2) are directly adjacent to each other at joining points (8), or that the stator parts (2a) of the stator (2) are adjacent to each other with an intermediate joining part, or that the stator parts (2a) of the stator (2) are arranged spaced apart from each other at joining points (8). [5] Two-phase motor (1) according to claim 4, characterized by , that the joining points (8), in particular four joining points (8), are arranged uniformly around their circumference, preferably that at least one joining point (8) is oriented towards a stator coil (4). [6] Two-phase motor (1) according to any one of claims 1 to 5, characterized bythat 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) [7] Two-phase motor (1) according to claim 6, characterized by that the recess (9) or recesses (9) is / are formed starting from an outside of the stator (2) and / or that the recess (9) or recesses (9) are arranged interrupting the internal teeth (7), advantageously that the recesses (9) are spaced approximately equally apart from each other. [8] Two-phase motor (1) according to any one of claims 1 to 7, characterized by, that each of the stator coils (4) is wound around a stator core (10), and that the stator cores (10) are arranged on the stator (2) as part of the stator (2), in particular that the stator cores (10) are attached to the stator (2) by force, form and / or material connection. [9] Two-phase motor (1) according to any one of claims 1 to 8, characterized by , that the stator cores (10) have at least one laterally arranged stator core recess (15) at their end, in particular at least two laterally arranged stator core recesses (15) at each end. [10] Two-phase motor (1) according to any one of claims 1 to 9, characterized by , that the stator (2) and the rotor (3) are arranged in a common, imaginary plane (E), in particular that the rotor (3) is held rotatably in the plane (E). [11] Two-phase motor (1) according to any one of claims 1 to 10, characterized by, that the rotor (3) has at least one magnetic rotor disk (3a) and at least two iron rotor disks (3b) in a sandwich construction.

Images