DOOR DRIVE WITH A SIMPLY CONSTRUCTED MOTOR UNIT WITH HIGH INTEGRATION DENSITY

Description

[0001] The invention relates to a door drive for arrangement on or in connection with a door system, with which at least one leaf element of the door system is movable, comprising a motor unit with a housing in which a stator is accommodated in a stationary manner and wherein a rotor is rotatably arranged in the housing, which rotor has an output shaft, wherein the output shaft can be brought into operative connection with the leaf element in a driving manner. Furthermore, the invention relates to a door system with such a door drive, comprising at least one leaf element with which the door drive is operatively connected in a driving manner.

[0002] DE 10 2008 046 062 A1 discloses a door drive for installation on a door system. The drive serves to move the leaf elements of the door system, which is designed as an automatic sliding door. For this purpose, the door drive comprises a motor unit with a housing, and a gear unit designed as a worm gear is attached to the housing of the motor unit. Thus, the motor unit is designed as a high-speed motor, and the gear unit reduces the higher speed of the motor unit's rotor to a lower speed to drive a pulley mounted on an output shaft of the gear unit.

[0003] A toothed belt is placed over the pulley, which is connected to the leaf elements of the automatic sliding door. Since the motor unit is designed to rotate quickly and the speed must be reduced to the pulley, the gearbox unit is required in conjunction with the motor, which requires additional installation space and makes the design of the door drive more complex. The spatial dimensions of the door drive must be adapted to the requirements of the gearbox unit, and since the motor has a cylindrical basic shape, it takes up a space that does not allow for optimal use of space in relation to its installation environment. The same applies to a worm gear, which is very space-intensive, especially when combined with the motor.

[0004] DE 10 2014 115 932 A1 discloses another door drive, which has a one-piece, cuboid-shaped body as its base body, in which recesses are provided to accommodate a motor unit and a gear stage. Further recesses and openings are provided in the block to accommodate a control system, a power supply, and the like. The cuboid-shaped body thus forms a housing that supports the individual components of the door drive and is constructed in one piece and, to a certain extent, monolithic over the entire dimensions of the drive. EP 2 757 219 A2 also discloses an example of a door drive.

[0005] When designing door drives for installation on or in conjunction with a door system, the aim is to make the door drive as compact and small as possible, for example by avoiding a gear unit or gear stage within the door drive. Door drives are usually arranged above the linearly movable leaf elements of an automatic sliding door system and have a support profile that forms the base of the door system. The door drive is integrated into the support profile, and the leaf elements are also guided linearly. A toothed belt is usually used as the connecting element between the door drive and the leaf elements, although other traction devices such as chain connections and the like are also possible.The door drive forms a separate unit with at least the motor, a power supply and a control system, which is integrated into the door system with the arrangement on the support profile.

[0006] In order to minimize the size of the support profile with a corresponding cover, housing, or other components, it is advantageous to also, and especially, design the door drive itself as compact and small as possible. However, since glass leaf elements can reach large masses, the door drive must have a high power density in order to be able to accelerate and decelerate such leaf elements accordingly, so that the door system still achieves adequate dynamics even with large leaf elements.

[0007] For high power density and, in particular, quiet operation, motor units combined with a toothed belt are ideal as direct drives. The pulley is mounted directly on the output shaft of the motor unit, over which the toothed belt is placed, which in turn is directly connected to the leaf elements. This allows the door drive to operate with minimal noise, as high motor speeds are not reached. With the appropriate design of the motor unit, power densities can be provided that are sufficient to accelerate and decelerate leaf elements of, for example, 200 kg to 250 kg sufficiently for the operation of an automatic sliding door.

[0008] Motor-gearbox units with a cylindrical outer motor shape and a worm gear arranged transversely to it do not allow for particularly high integration density, especially with regard to the available output power at the output shaft. Furthermore, the further compact arrangement of a power supply, a controller, and, for example, a control panel while maintaining a high integration density is difficult.

[0009] The object of the invention is to create a door drive with a motor unit that has a high integration density and a high power density. The motor, in conjunction with the at least one leaf element, is to be designed, in particular, as a direct drive, while creating a simple and easy-to-install motor unit. The motor is to be designed, in particular, as an internal rotor and operate according to the principle of a torque motor.

[0010] This object is achieved by a door drive according to claim 1 and by a door system according to claim 12 with the respective characterizing features. Advantageous developments of the invention are specified in the dependent claims and in the description.

[0011] The invention includes the technical teaching that the housing is formed from two housing halves connected to one another, wherein the stator is arranged with first fastening elements inside a first housing half and wherein second fastening elements are provided with which the second housing half is arranged on the first housing half.

[0012] The core idea of ​​the invention is a simple basic structure of the motor unit with housing halves, which can be designed in the shape of a half-shell. When the housing halves are connected to one another, the basic body of the motor unit thus formed is completed. The housing halves do not necessarily have to form an exact half of the housing, and the dividing plane between the housing halves does not have to be half the height of a vertical edge of the housing. In this respect, housing halves can also be provided within the meaning of the invention which are differently dimensioned, designed and dimensioned; however, these can be brought onto one another and connected in such a way that a cuboid is created to form the housing, thus forming the basic shape of the motor unit. Two housing halves are preferably provided.

[0013] According to the invention, the stator and rotor are accommodated between the housing halves within the motor unit. If the housing halves are shell-like, they can be connected to one another directly or indirectly. If the housing halves are connected directly to one another, a circumferential, approximately rectangular edge of the respective housing half is joined directly to one another. If the housing halves are connected indirectly, an intermediate element, such as a sealing element or the like, can also be arranged between the housing halves.

[0014] In particular, the invention does not provide for the stator with its laminated core to form an intermediate section between the housing halves, which, after the two housing halves have been joined, still forms part of the outer skin of the motor unit over its entire circumference. The housing halves are therefore joined together in a manner that serves more as a direct connection, so that the two housing halves touch each other, regardless of the presence of a seal or the like.

[0015] The stator has a ring-shaped basic structure, and within the ring shape, the rotor is rotatably mounted via the output shaft. Since the rotor is particularly mounted via both housing halves, to assemble the motor unit, the stator is first fastened internally in a first housing half using initial fastening elements. Then, after inserting the rotor, the second housing half is joined to the first housing half. This basic principle of the motor unit design results in simple assembly with a total of few assembly steps, and dimensional deviations in the manufacture of the stator can be ignored when joining the housing halves. This is particularly advantageous when the rotor shaft is rotatably mounted in the respective housing halves via two associated bearing elements.The fit of the stator may still need to be adjusted to the first housing half, without the second housing half having common fastening elements with the stator.

[0016] Particularly advantageously, the motor unit has the basic shape of a cuboid. A cuboid, within the meaning of the present invention, is a body bounded by six rectangular surfaces. These rectangular surfaces should be essentially, but not completely, flat, and may therefore have projections, curvatures, bevels, ribs, and the like. Therefore, within the meaning of the invention, the cuboid shape of the motor unit should at best be understood in an approximately mathematical sense; a rectangular body with slight angular and shape deviations thus still falls under the term "cuboid."

[0017] Since the basic shape of the motor unit itself is intended to be a cuboid, this can also be understood as an envelope shape, without the housing of the motor unit having an exact cuboid shape. This clarifies that the motor unit should not have a standard cylindrical basic shape, for example, with two bearing plates between which the stator is enclosed, which is exposed to the outside, and the bearing plates would be connected to each other with tie rods. This motor design is precisely not intended according to the invention.

[0018] Thus, according to the design of the motor unit within the scope of the invention, it is possible to advantageously create a door drive with the cuboid shape, in which additional components such as a power supply or a controller can be attached to the rectangular housing of the motor with optimal use of installation space. In particular, the cuboid shape of the housing of the motor unit favors the arrangement of the stator in a first housing half and the arrangement of the second housing half on the first housing half, since the assembly of the stator in the first housing half is not subject to tolerances, and the second housing half can be arranged on the first housing half without taking the stator into account.

[0019] The round basic shape of the stator and the cuboid shape of the housing of the motor unit create corner areas in which the fastening elements between the housing halves, as well as other fastening elements that are necessary for connecting flanges and the like, can be advantageously integrated.

[0020] According to a further embodiment, the housing halves have inwardly folded bearing receiving sections, into which bearing elements are inserted, via which the output shaft is mounted. For this purpose, the rotor can have an H-shape in half section, so that radially circumferential receiving areas are formed within a support body of the rotor, into which the bearing receiving sections with the inserted bearing elements can extend. This creates a high level of integration in the design of the motor unit.

[0021] The housing halves are further advantageously screwed together in abutting manner via associated interfaces, with the fastening elements being formed by screw elements. Furthermore, it is possible to fasten the stator in or to the first housing half using screw elements. The screw elements between the housing halves and the screw elements for fastening the stator in the first housing half can be integrated in the corner areas of the cuboid for even better use of installation space.

[0022] The cuboid further advantageously has a longitudinal edge, a width edge, and a height edge, wherein the longitudinal edge is larger than the width edge and wherein the width edge is larger than the height edge. For example, the width edge has a length of 70% to 98%, in particular 85% to 95%, of the length of the longitudinal edge. The height edge can have a length of 30% to 60%, in particular 40% to 50%, of the length of the longitudinal edge. If the length of the longitudinal edge is, for example, 100 mm, the width edge has a length of, for example, 90 mm, and the height edge has a length of, for example, 40 mm to 50 mm.

[0023] The longitudinal edge and the width edge can define an end face, with the output shaft protruding from the end face, and a pulley can be mounted on the portion of the output shaft that protrudes perpendicularly from the end face. The end face of the motor unit is advantageously designed to be flat, so that the pulley can extend to just before the flat surface of the end face.

[0024] The first housing half and / or the second housing half has an internal receiving section into which the stator is inserted. The housing halves can be designed in a half-shell shape.

[0025] An at least partially circumferential heat transfer gap is thus formed between an outer side of the stator and an inner side of the receiving section. In order to serve as such for heat transfer from the stator into at least one or both housing halves, the heat transfer gap is designed with values ​​of, for example, between -0.05 mm and 0.1 mm, so that a transition fit is formed between the stator and the receiving area of ​​the stator in the housing half or in both housing halves. Heat generated in the stator during operation of the motor unit can advantageously be transferred to the housing halves and dissipated to the environment via these.

[0026] Another advantage of the stator is that it features a lamination stack that forms the outer surface of the stator and thus a boundary surface of the heat transfer gap. This allows for even better heat dissipation from the stator, as the heat is transferred directly from the lamination stack to the housing halves.

[0027] The stator has a plastic winding support, with a partial surface of the winding support arranged laterally of the lamination stack in frictional engagement with the screw connection by means of the first fastening elements of the stator and the first housing half. The plastic winding support, within the frictional engagement of the screw connection of the stator and the first housing half, creates a flexibility zone that minimizes thermal stresses when the motor unit heats up.

[0028] The stator can be located outside the force flow of the screw connection between the first housing half and the second housing half by means of the second fastening elements. For example, a sealing element or the like is inserted between the housing halves, or the housing halves are screwed directly together flush.

[0029] By connecting the stator to the housing on one side, the further advantage can be easily achieved that the housing has at least one window-like recess into which a surface section of the stator projects. The surface of the surface section can be flush with the outer surface of the housing and the recess made in it in a common plane. In particular, respective window-like recesses can be made in two, for example, opposite surfaces of the front and rear, into which a respective surface section of the stator projects. This easily creates the possibility of bringing the stator into heat-transferring contact with another body, despite a substantially closed housing, in order to effectively dissipate heat from the stator.The window-like recess has an area that represents only a small percentage of the total surface area of ​​the housing of the motor unit, for example 2% to 20% and preferably 5% to 15%.

[0030] The invention further relates to a door system with a door drive having the features described above. The door system can have a connecting element for connection to a leaf element. Additionally or alternatively, the door system can have at least one leaf element with which the door drive is operatively connected.

[0031] For example, the door system can be designed as a sliding door system. The sliding door system can comprise a belt, in particular a toothed belt. The connecting element can be connected at least indirectly to the belt. The connecting element can be designed as a runner, in particular as a trolley. The connecting element can run in a rail, in particular in a rail of the support profile. The belt can be tensioned between pulleys of the door system. One of the pulleys can be designed as the pulley of the door drive according to the invention. PREFERRED EMBODIMENT OF THE INVENTION

[0032] Further measures improving the invention are described in more detail below, together with the description of a preferred embodiment of the invention, with reference to the figures. It shows: Fig. 1 an overall view of the door drive with a motor unit, Fig. 2 a perspective view of the motor unit, Fig. 3 a perspective view of the motor unit according to Fig. 2 , with one housing half removed in the view, Fig. 4 a half section of the motor unit and Fig. 5 a perspective view of the stator.

[0033] Fig. 1 shows an overall view of the door drive 100 as it can be installed in a building, which should also include installation on ships and in aircraft, and a door drive 100 of this type serves, for example, as a drive for an automatic sliding door system.

[0034] The basic structure of the door drive 100 is formed by a support profile 31, which is shown in shortened form for ease of viewing. In addition, the essential upper part of the L-shaped support profile 31 is shown cut open in order to make the other essential components of the door drive 100 visible.

[0035] As a central component, the door drive 100 has a motor unit 1, and the motor unit 1 has the basic shape of a cuboid 18, which forms the housing 10 of the motor unit 1. In order to enable an output and thus a connection to a leaf element of a door system (not shown in detail), a pulley 25 is arranged on the motor unit 1, over which a toothed belt can be placed, which ultimately establishes the connection to the leaf element(s), for example the sliding glass elements.

[0036] Adjacent to the motor unit 1, the door drive 100 has a power supply 32 and a controller 33, and the power supply 32 and the controller 33 are arranged on opposite sides of the motor unit 1. The motor unit 1 is fastened to the support profile 31 by a first flange element 34, wherein the first flange element 34 also accommodates the power supply 32. Furthermore, the motor unit 1 is connected to the support profile 31 by a second flange element 35, wherein the second flange element 35 also accommodates the controller 33. Alternatively, the design of a single flange is also possible in order to accommodate at least the motor unit 1, the power supply 32, and the controller 33. Furthermore, it is possible for the motor unit, the power supply 32, and / or the controller 33 to each have associated separate flange elements for arrangement in or on the support profile 31.

[0037] Fig. 2shows a perspective view of the isolated motor unit 1 with the housing 10, and outside the housing 10, in the illustration, the pulley 25 for coupling a toothed belt is located on the top side above the end face 36 of the housing 10, which is flat and free of fastening means.

[0038] The housing 10 of the motor unit 1 has a first lower housing half 14 and a second upper housing half 15, which are designed identically by way of example, but do not have to be designed identically within the scope of the invention. Laterally, the housing 10 is bounded by a first side surface 37 and an opposite second side surface 38, and the flange elements 34 and 35 can be arranged on the side surfaces 37 and 38, which in Fig. 1 are shown.

[0039] The cuboid 14 formed by the housing 10 has corner areas in which screw holes are provided for fastening the flange elements 34, 35 using screw elements. Furthermore, the fastening elements 17 for screwing the housing halves 14 and 15 together are located in the corner areas.

[0040] The cuboid 18 is determined by the longitudinal edge 21, the width edge 22 and the height edge 23, whereby the side surfaces 23, 24 are spanned by the width edge 18 and the height edge 19.

[0041] The front surface, which is spanned by the longitudinal edge 21 and the height edge 23, has a window-shaped recess 29, from which a surface section 30 of the stator (not shown in the view) protrudes, wherein in connection with the stator 11 on Fig. 6The outwardly facing surface section 30 of the stator 11 serves for heat-transferring contact with another body, for example with the support profile 31 or with another, separate heat sink. This allows the stator 11 to be brought into direct heat-transferring contact with a motor component, despite the essentially closed housing 10 with the lower and upper housing halves 14, 15.

[0042] The stator 11 as shown in Fig. 3 is screwed to the lower housing half 14 with the screw arrangement 16, and on the front and on the back of the stator 11 there are respective surface sections 30 in an opposite arrangement, which form a surface section of the outer skin of the motor unit 1 as described above.

[0043] Through the removed second housing half 15, the stator 11 is shown with the rotor 12 arranged within the stator 11, wherein the rotor 12 is formed integrally with the output shaft 13, which is led out of the upper housing half, and the part of the output shaft 13 extending out of the end face 36 of the housing 10 receives the pulley 25.

[0044] Fig. 4 shows a perspective view of the first, lower housing half 14, within which a receiving section 26 is shown, which extends around a bearing receiving section 19. Thus, the receiving section 26 is designed to be approximately annular, and on the outside, the receiving section 26 for receiving the stator is delimited by an inner side 39, with which the outer surface of the stator 11 forms the heat transfer gap.

[0045] In Fig. 5In a sectional view of the motor unit 1, the stator 11 is shown arranged within the housing halves 14, 15, and the heat transfer gap 27 is indicated. The heat transfer gap 27 runs intermittently around the embodiments of the annular stator 11, so that heat generated in the stator 11 during operation of the motor unit 1 can be transferred into the housing halves 14, 15.

[0046] The bearing of the rotor 12 is shown with two bearing elements 20, which are accommodated in respective bearing support sections 19. A pulley 25 is mounted on the free end of the output shaft 13. Located on the underside of the first housing half 14 is a circuit board 40, which serves for the wireless contact of the windings (not shown in detail) on the stator 11. The stator 11 has a laminated core 41, which is enclosed by the winding support 28.

[0047] A perspective view of such a stator 11 shows Fig. 6 The stator 11 has twelve coils 42, which are wound on respective inwardly facing teeth 43. On the outer circumference of the annular lamination stack 41 are screw passages 44 through which the fastening elements 16 are guided in order to screw the stator 11 to the lower, first housing half 14, see Fig. 3 .

[0048] The invention is not limited in its implementation to the preferred embodiment described above. Rather, within the scope of the claims, a number of variants are conceivable that utilize the presented solution even in fundamentally different embodiments. List of reference symbols

[0049] 100 door drive 1Motor unit 10 Housing 11 Stator 12 Rotor 13 Output shaft 14 First housing half 15 Second housing half 16 Fastening element 17 Fastening element 18 Cuboid 19 Bearing support section 20 Bearing element 21 Longitudinal edge 22 Width edge 23 Height edge 24 End face 25 Belt sprocket 26 Support section 27 Heat transfer gap 28 Winding support 29 Window-like recess 30 Surface section 31 Support profile 32 Power supply 33 Control system 34 First flange element 35 Second flange element 36 End face 37 First side face 38 Second side face 39 Inside 40 Printed circuit board 41 Laminated core package 42 Coil 43 Tooth 44 Screw passage

Claims

1. A door drive (100) for arrangement on or in connection with a door system, with which at least one leaf element of the door system can be moved, having a motor unit (1) with a housing (10), in which a stator (11) is received in a stationary manner and wherein a rotor (12) is arranged in the housing (10) so as to be rotationally movable, wherein the stator (11) has an annular basic structure, and the rotor (12) is received within the annular shape so as to be rotationally movable via an output shaft (13), wherein the output shaft (13) can be brought into operative connection in a driving manner with the leaf element, characterised in that the housing (10) is formed from interconnected housing halves (14, 15), wherein the first housing half (14) and / or the second housing half (15) has an internal receiving section (26) into which the stator (11) is inserted, wherein the stator (11) is arranged in a retained manner with first fastening elements (16) inside of a first housing half (14) and wherein second fastening elements (17) are provided, with which the second housing half (15) is arranged on the first housing half (14), and wherein an at least partially circumferential heat transfer gap (27) is formed between an outer side of the stator (11) and an inner side of the receiving section (26) in order to serve as such for heat transfer from the stator (11) into the at least one or into both housing halves (14, 15).

2. The door drive (100) according to claim 1, characterised in that the motor unit (1) has the basic shape of a cuboid (18).

3. The door drive (100) according to claim 1 or 2, characterised in that the housing halves (14, 15) have inwardly inverted bearing receiving sections (19), in which bearing elements (20) are inserted, via which the output shaft (13) is supported.

4. The door drive (100) according to one of claims 1 to 3, characterised in that the housing halves (14, 15) are screwed together so as to bear against one another via boundary surfaces facing each other, wherein the fastening elements (17) are formed by means of screw elements.

5. The door drive (100) according to one of claims 2 to 4, characterised in that the cuboid (14) has a longitudinal edge (21), a width edge (22) and a height edge (23), wherein the longitudinal edge (21) is larger than the width edge (22) and / or wherein the width edge (22) is larger than the height edge (23).

6. The door drive (100) according to claim 5, characterised in that the longitudinal edge (21) and the width edge (22) span an end face (36), wherein the output shaft (13) projects from the end face (36) and / or wherein a belt pulley (25) is attached to the section of the output shaft (13) which projects perpendicularly from the end face (36), wherein the end face (24) of the motor unit (1) is designed to be planar and the belt pulley (25) extends up to in front of the planar face of the end face (24).

7. The door drive (100) according to claim 6, characterised in that the heat transfer gap (27) has a gap dimension of -0.1 mm to 0.5 mm and / or of -0.05 mm to 0.2 mm and / or of -0.05 mm to 0.1 mm.

8. The door drive (100) according to claim 6 or 7, characterised in that the stator (11) has a package of sheet metal laminations which forms the outer side of the stator (11) and forms a boundary surface of the heat transfer gap (27).

9. The door drive (100) according to one of the preceding claims, characterised in that the stator (11) has a winding carrier (28) of a plastic, wherein the winding carrier (28) is arranged with a partial surface in the force flow of the screw connection by means of the first fastening elements (16) of the stator (11) to the first housing half (14).

10. The door drive (100) according to one of the preceding claims, characterised in that the stator (11) lies outside the force flow of the screw connection of the first housing half (14) to the second housing half (15) by means of the second fastening elements (17).

11. The door drive (100) according to one of the preceding claims, characterised in that the housing (10) has at least one window-like recess (29) into which a surface section (30) of the stator (11) projects.

12. A door system with a door drive (100) according to one of the preceding claims, having at least one connection element for connecting to a leaf element and / or at least one leaf element with which the door drive (100) is operatively connected in a driving manner.