Door drive with powerful, compact motor unit

Abstract

The invention relates to a door drive (100) for being arranged at or connected to a door installation, by means of which at least one door leaf element of the door installation can be moved, the door drive comprising a motor unit (1), the motor unit comprising a housing (10), in which a stator (11) is stationarily accommodated, and wherein a rotor (12) is rotatably arranged in the housing (10), the rotor comprising an output shaft (13), wherein the output shaft (13) is operatively connected to the door leaf element in a driving manner. According to the invention, the rotor (12) comprises a carrier (14), on which a receiving area (15) is formed, to which a permanent magnet (16) is adhesively bonded.

Description

Technical Field

[0001] The present invention relates to a door drive for being arranged at or connected to a door installation, by means of which at least one door leaf element of the door installation can be moved, the door drive comprising a motor unit having a housing in which a stator is stationarily accommodated, and wherein a rotor is rotatably arranged in the housing, the rotor having an output shaft, wherein the output shaft can be operatively connected to the door leaf element in a driving manner. The present invention also relates to a door installation having such a door drive, the door installation having at least one door leaf element to which the door drive is operatively connected in a driving manner. Background Art

[0002] DE 10 2008 046 062 A1 discloses a door drive for use in a door installation, wherein the drive is used to move a door leaf element of the door installation, the door installation being designed as an automatic sliding door. The door drive comprises a motor unit having a housing, and a transmission unit mounted on the housing of the motor unit, the transmission unit being designed as a worm gear. The motor unit is designed as a fast-rotating motor, and the transmission unit is used to reduce the high rotational speed of the rotor of the motor unit to a lower rotational speed for driving a belt pulley mounted on an output shaft of the transmission unit.

[0003] A toothed belt is guided via a belt pulley and connected to the door leaf elements of an automatic sliding door. Therefore, the motor unit is designed for high rotational speed, and the speed must be reduced to the belt pulley. This requires a transmission unit in conjunction with the motor, which occupies additional installation space and complicates the design of the door drive. The spatial dimensions of the door drive must be adapted to the requirements of the transmission unit, and because the motor has a cylindrical basic shape, it occupies installation space that is not optimally utilized in relation to its installation environment. The same applies to the worm gear, which, in particular, extends laterally in conjunction with the motor and thus requires a significant amount of installation space.

[0004] If the driven shaft is to run horizontally in the installed door installation to directly accommodate the belt pulley, the motor design must be short, particularly in the direction of the driven shaft's extension. Otherwise, installation space constraints arise when installing the motor unit. This is because the rotating part driven by the toothed belt via the belt pulley must still be able to pass within the support profile, past the belt pulley, in a support profile for accommodating a door leaf element, such as an automatic sliding door. Therefore, the motor unit should be designed to be as short as possible in the direction of the axis of rotation.

[0005] DE 10 2014 115 932 A1 discloses another door drive, which has a one-piece, cuboid body as a basic body, which is introduced into a recess to accommodate the motor unit and the gear stage. To accommodate additional control devices, power supplies, etc., further recesses and openings are provided in the block. The cuboid body thus forms a housing that supports the various components of the door drive and is designed to be one-piece and, to a certain extent, monolithic across the entire size of the drive. The rotor is supported by a shaft enclosed in the cuboid body of the door drive. This results in unfavorable load conditions due to the shaft being enclosed on one side, particularly when high forces are introduced into the rotor via the gear stage in the case of large, heavy, all-glass door leaf elements, which must be absorbed by the oppositely enclosed shaft.

[0006] In principle, when designing a door drive for installation on or connection to a door installation, the goal is to make the door drive as compact and small as possible, for example by avoiding a transmission unit or transmission stage within the door drive. The door drive is typically located above a linearly movable door leaf element of an automatic sliding door installation and comprises a support profile, which forms the basic structure of the door installation and in which the door drive is integrally mounted and which also linearly guides the door leaf element. A toothed belt is typically used as the connection between the door drive and the door leaf element, although other traction mechanisms, such as chain connections, are also possible. The door drive, together with at least the motor, power supply, and control system, forms a separate structural unit, which is integrated into the door installation by being located on the support profile.

[0007] In order to design the supporting profile together with the corresponding cover, housing or other components as small as possible, it is also advantageous, and in particular advantageous, to design the door drive itself as compact and small as possible. However, since the door leaf elements made of glass have a high mass, the door drive must have a high power density so that, despite the small overall size, such door leaf elements can be accelerated and decelerated accordingly, thereby achieving the required dynamics even for door installations with large door leaf elements.

[0008] For high power density and particularly low-noise operation, a motor unit in combination with a toothed belt as a direct drive is suitable. A belt pulley is applied directly to the output shaft of the motor unit, onto which a toothed belt rests, which in turn is directly connected to the door leaf element. This allows the door drive to be operated with minimal noise, since high motor speeds are not reached. With a corresponding design of the motor unit, a power density can be achieved that is sufficient to accelerate and decelerate a door leaf element weighing, for example, 200 to 250 kg sufficiently for the operation of an automatic sliding door.

[0009] In motor units with direct drives, very low rotational speeds of the rotor are usually achieved in combination with high torques, which necessitates a particularly robust mounting of the rotor in the housing of the motor unit.

[0010] According to conventional designs, the stator has a plurality of coils, which are applied to radially inward-facing teeth of the stator on an inner rotor. A rotor is rotatably housed within these radially inward-facing teeth and includes a plurality of permanent magnets. If the coils are electrically actuated and energized radially around them, the rotor is set in rotation by the permanent magnets. The connection of the permanent magnets to the rotor's carrier is often problematic. Typically, the permanent magnets are fixed to the carrier using clamping elements or are cast together with the carrier using a casting compound. Summary of the Invention

[0011] The object of the present invention is to provide a door drive having a motor unit with a high integration density and a high power density, wherein the motor is designed, in particular, as a direct drive in combination with at least one door leaf element. Despite the high integration density of the door drive, a compact embodiment of the motor unit is to be achieved, in particular with a high packaging density within the housing.

[0012] The object is achieved based on the door drive according to the invention and based on the door installation according to the invention by means of the respective characteristic features. Advantageous developments of the invention are given below and in the description.

[0013] The invention includes the technical teaching that the rotor has a carrier on which a receiving area is formed and to which the permanent magnet is adhesively bonded.

[0014] The core concept of the present invention is a simple design of a rotor with a driven shaft, comprising a carrier body with permanent magnets arranged thereon. To facilitate a simple arrangement of the permanent magnets, particularly without the use of additional components, the present invention proposes providing a receiving area on the outer circumference of the carrier body, to which the permanent magnets are adhesively bonded. The provision of the receiving area defines the relative position of the permanent magnets when arranged on the carrier body, and the receiving area can advantageously be designed such that an adhesive connection is sufficient to securely attach the permanent magnets to the carrier body.

[0015] The receiving area does not have to be a flat area and can advantageously have at least one rectangular shape, to which the rectangular shape of the permanent magnet is adapted so that the function of precisely positioning the permanent magnet on the carrier is fulfilled. The rectangular shape has a longer side and a shorter side, wherein the longer side extends parallel to the axis of rotation of the output shaft and thus the rotor.

[0016] The carrier, which has multiple receiving areas around its outer circumference, and the permanent magnets themselves can therefore be dimensioned so that a very small gap exists between the outer sides of the permanent magnets and the inner sides of the stator teeth. This increases the torque of the motor unit while maintaining otherwise unchanged outer dimensions, and due to the potting material, the surface of the permanent magnets can be dimensioned very close to the inner surfaces of the stator teeth, to which the coils with wound wire are applied.

[0017] Advantageously, the rotor has a circumferential region that forms a polygonal configuration with the receiving zones. A separating piece is advantageously formed between the receiving zones, forming part of the circumferential region and extending parallel to the axis of rotation of the driven shaft and, therefore, the rotor. The separating piece separates two adjacent receiving zones and simultaneously serves to orient and position the bonded permanent magnets. In particular, the separating piece ensures a defined spacing between two adjacent permanent magnets.

[0018] The receiving area particularly advantageously has an elongated extension between the separating plates, extending parallel to the axis of rotation, and it is proposed that narrow support strips be formed adjacent to the separating plates on the long sides of the receiving area. The permanent magnets can be positioned in a defined manner on these support strips, with the side of the permanent magnets facing the carrier being, for example, flat. The radially outward-pointing front face of the permanent magnet can have a curvature that corresponds to the radius of the rotor, while the radially inward-pointing rear face of the permanent magnet can be, for example, flat, although this is not essential. This further improves the gap between the permanent magnets and the inward-pointing end faces of the stator teeth.

[0019] The receiving area includes recessed areas between the support strips, so that when the permanent magnet is placed on the receiving area, a width-limited adhesive gap is formed for accommodating the adhesive. Particularly advantageously, the receiving area is not designed to be flat, but rather to include a recessed area formed by a slight depression in the receiving area, which serves to accommodate the adhesive, especially when the side of the permanent magnet facing the receiving area is flat. The depth of the recessed area, and thus the design of the adhesive gap, is adapted to the adhesive used. In particular, acrylate adhesives and / or anaerobic adhesives, such as LOCTITE-3342™, can be used.

[0020] Furthermore, it is proposed that the permanent magnet, on the side facing away from the driven shaft, can project beyond the carrier and, if necessary, also beyond the stator. This has the advantage that a Hall sensor can be arranged in or on the housing, which can interact with the permanent magnet, in particular in order to initiate the actuation of the electronic commutation of a slowly running electric motor by means of a control device.

[0021] Furthermore, the carrier has a T-shape with respect to its circumferential cross-section, which can be described synonymously as an H-shape in a half-section. This creates an inner recess that is radially circumferential and into which a bearing element for supporting the driven shaft in the motor unit housing is introduced. When the motor unit is installed, the free area within the carrier is filled with a bearing element that is introduced into a bearing receptacle section, which in turn can be integrally molded onto the housing halves. The H-shape of the carrier in cross-section does not negatively affect the function of accommodating the permanent magnets; however, the bearing element for supporting the rotor in the motor unit can still be accommodated at least to a large extent at the radially inner height of the rotating cylinder of the permanent magnet.

[0022] According to another advantageous embodiment, the driven shaft is formed with a rotor surrounding section, on which a carrier body equipped with permanent magnets is applied, wherein the driven shaft in particular has a first supporting section and a second supporting section, in which a supporting element is respectively accommodated, wherein a rotor receiving section is formed between the supporting sections.

[0023] Furthermore, it is advantageous if the carrier consists of a metallic sintered material.

[0024] Alternatively, it can be provided that the carrier consists of a metallic casting material, in particular a fine casting material.

[0025] Furthermore, there is the advantageous possibility of applying a film-like retaining element to the carrier equipped with the permanent magnets. The film-like retaining element can be formed by an insulating tube made of polyester film, which is shrink-fitted onto the carrier equipped with the permanent magnets. The polyester film is thin in this case so that it also fits into the gap between the outer side of the permanent magnet and the inner side of the stator teeth. For example, the polyester film has a thickness of 0.1 mm. Using this polyester film as an insulating tube ensures that, even if the adhesive connection is accidentally loosened, the permanent magnet cannot be removed from the carrier and thus block the motor unit.

[0026] Alternatively, the film-like holding body is formed by a wound body made of a glass fiber film or a glass fiber fabric.

[0027] The output shaft can extend away from the end face of the housing, so that a belt pulley is attached to this section of the output shaft. A toothed belt rests on the belt pulley and can be directly connected to a door leaf element of the door installation. This allows the door drive to be designed with the motor unit as a direct drive, eliminating the need for a gearbox.

[0028] The present invention also relates to a door installation having a door drive having the above-described features. The door installation may have a connecting element for connecting to a door leaf element. Additionally or alternatively, the door installation may have at least one door leaf element to which the door drive is operatively connected in a driving manner.

[0029] For example, the door installation can be designed as a sliding door installation. The sliding door installation can include a belt, in particular a toothed belt. The connecting element can be at least indirectly connected to the belt. The connecting element can be designed as a slider, in particular as a roller carriage. The connecting element can run in a track, in particular a track carrying a profile. The belt can be tensioned between pulleys of the door installation. One of the pulleys can be designed as a pulley of the door drive according to the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Other measures for improving the present invention are described in detail below together with the description of preferred embodiments of the present invention with reference to the accompanying drawings. The accompanying drawings show:

[0031] Figure 1 shows an overall view of a door drive with a motor unit according to the invention,

[0032] Figure 2 shows a perspective view of the motor unit with the upper housing half removed,

[0033] Figure 3 shows a half section of the motor unit without the upper housing half,

[0034] Figure 4 A perspective view showing a rotor of a motor unit,

[0035] Figure 5 A detailed view showing a section of the rotor, and

[0036] Figure 6 A perspective view of a permanent magnet is shown. DETAILED DESCRIPTION

[0037] Figure 1 The overall view shows a door drive 100, which can be installed in connection with a door installation in a building, thereby also including installation in ships and aircraft, and this type of door drive 100 is used, for example, as a drive for automatic sliding door installations. The basic structure of the door drive 100 forms a support profile 29, which is shown shortened for a simpler view. Furthermore, the main upper part of the L-shaped support profile 29 is shown cut away to allow for visibility of other components of the door drive 100 that are important in this context.

[0038] As a central component, the door drive 100 has a motor unit 1 having the basic shape of a cuboid, which forms the housing 10 of the motor unit 1. In order to enable the output and the connection to a door leaf element (not shown in detail) of the door installation, a belt pulley 27 is provided on the motor unit 1, onto which a toothed belt can be placed, by means of which a connection is ultimately established to one or more door leaf elements, for example a glass sliding element.

[0039] Adjacent to the motor unit 1, the door drive 100 has a power supply 30 and a control unit 31, and the power supply 30 and the control unit 31 are arranged on opposite sides of the motor unit 1. The motor unit 1 is fixed to the support profile 29 by means of a first flange element 32, wherein the first flange element 32 also holds the power supply 30. Furthermore, the motor unit 1 is connected to the support profile 29 by means of a second flange element 33, wherein the second flange element 33 also holds the control unit 31. Alternatively, it is also possible to form a single flange to accommodate at least the motor unit 1, the power supply 30, and the control unit 31. Furthermore, it is possible for the motor unit 1, the power supply 30, and / or the control unit 31 to have respectively associated separate flange elements for being arranged in or on the support profile 29.

[0040] Figure 2 A perspective view of a motor unit 1 having a housing 10 is shown, with only the lower housing half being shown, and the upper housing half being removed to illustrate further components of the motor unit 1. A stator 11 is mounted on the inside of the housing 10, which in the illustration relates particularly to the lower housing half, and a rotor 12 is rotatably accommodated within the stator 11 in an output shaft 13. A belt pulley 27 is attached to the output shaft 13 on the upper housing part (not shown), so that the motor unit 1 is designed as a direct drive, with only a toothed belt extending between the motor unit 1 and a door installation, for example, a door leaf element of an automatic sliding door.

[0041] Figure 3 The motor unit 1 is shown in a cross-sectional view with a rotor 12, which has as its main components an output shaft 13 and a carrier 14, and permanent magnets 16 applied at regular intervals on the outside of the carrier 14. A belt pulley 27 is applied to the output shaft 13 on the part protruding from the housing 10.

[0042] The output shaft 13 is formed with a rotor receiving section 24, to which the carrier 14, which is equipped with permanent magnets 16, is applied. Furthermore, the output shaft 13 has a first bearing section 25 and a second bearing section 26, on which a bearing element 23 is respectively received. The rotor receiving section 24 is located between the bearing sections 25 and 26 relative to the longitudinal axis of the output shaft 13.

[0043] The carrier 14 has a T-shape with respect to its circumferential cross section, wherein the shape of the carrier 14 with respect to its entire cross section can also be described as an H-shape. This forms an inner recess 22 into which a support element 23 is introduced.

[0044] Figure 4 A perspective view of a rotor 12 with an output shaft 13 and a carrier 14 is shown, with the lower recess 22 visible. A support element 23 is shown inserted, for example, within the only visible recess 22 within the carrier 14, which serves to rotatably accommodate the output shaft 13. On the outer circumference, the carrier 14 has receiving areas 15, to which permanent magnets 16 are applied, with the permanent magnets 16 not being shown in three receiving areas 15 by way of example.

[0045] Figure 5 The carrier 14 is shown in FIG. Figure 4 An enlarged view of a section in the circumferential region of a removed permanent magnet 16. The freely visible receiving areas 15 are separated from one another by separating webs 19, which form part of the circumferential region 17 of the rotor 12 and extend parallel to the rotor's axis of rotation, i.e., in the direction of its height. Support bars 20 are formed laterally to the separating webs 19, on which the permanent magnet 16 rests, thus providing a defined support.

[0046] A recessed area 21 extends between the support strips 20, and a permanent magnet 16 is arranged on the receiving area 15, resting laterally on the support strips 20 and held in place by adhesive, which is located in the gap thus formed between the permanent magnet 16 and the recessed area 21 of the receiving area 15. The slightly concave curvature of the recessed area 21 creates a defined adhesive gap, enabling acrylic adhesives, particularly anaerobic adhesives, to achieve a correspondingly high adhesive strength. This ensures that the sheared permanent magnet 16 does not become loose during operation of the motor unit 1. Due to its direct drive connection to the toothed belt and thus to the door leaf element of the door installation, the motor unit 1 is designed as a low-speed rotating part. This prevents the rotor from reaching high rotational speeds, and thus prevents excessive flow forces on the permanent magnet 16 during operation of the motor unit 1.

[0047] Figure 6 Finally, a separate view of the permanent magnet 16 is shown, with the front face 24 forming a curved outer side which, in the bonded state, points toward the stator, and the rear face 35 preferably forming a flat surface which points toward the receiving area 15 and forms a cavity for the adhesive with the groove area 21 .

[0048] The present invention is not limited in its embodiments to the preferred exemplary embodiments presented above. Rather, numerous variations are conceivable, and the various variations of the solution presented can also be used in principle in various different embodiments. All features and / or advantages arising from the claims, the description, or the drawings, including structural details or spatial arrangements, may be essential to the invention both individually and in various combinations.

[0049] List of reference numerals:

[0050] 100 gate drivers

[0051] 1 motor unit

[0052] 10 Housing

[0053] 11 stator

[0054] 12 rotors

[0055] 13 driven shaft

[0056] 14 Carrier

[0057] 15 Accommodation Area

[0058] 16 permanent magnets

[0059] 17 Circumferential area

[0060] 18 Rotation axis

[0061] 19 separators

[0062] 20 support bars

[0063] 21 Groove area

[0064] 22 blank space

[0065] 23 Support element

[0066] 24 Rotor receiving section

[0067] 25 First support section

[0068] 26 Second support section

[0069] 27 Belt pulley

[0070] 28 end side

[0071] 29 load-bearing profile

[0072] 30 Power Supply

[0073] 31 Control Agency

[0074] 32 First flange component

[0075] 33 Second flange component

[0076] 34 Anterior face

[0077] 35 rear face

Claims

1. A door drive (100) for being arranged at or connected to a door installation, by means of which at least one door leaf element of the door installation can be moved, the door drive comprising a motor unit (1), the motor unit comprising a housing (10), in which a stator (11) is stationarily accommodated, and wherein a rotor (12) is rotatably arranged in the housing (10), the rotor comprising a driven shaft (13), wherein the driven shaft (13) is operatively connected to the door leaf element in a driving manner, and wherein the rotor (12) comprises a carrier (14), wherein at the carrier A receiving area (15) is formed, to which a permanent magnet (16) is glued, wherein the rotor (12) also has a peripheral area (17), which forms a polygonal configuration with the receiving area (15), and wherein the rotor (12) has a rotation axis (18), wherein separating pieces (19) are formed between the receiving areas (15), the separating pieces forming part of the peripheral area (17) and extending parallel to the rotation axis (18), and wherein the receiving area (15) has an elongated extension running parallel to the rotation axis (18) between the separating pieces (19), It is characterized by: The receiving area (15) is formed on its long sides with support strips (20) that are laterally adjacent to the separating piece (19), wherein the receiving area (15) has a groove area (21) between the support strips (20), so that when the permanent magnet (16) is arranged on the receiving area (15), a defined bonding gap is formed for accommodating the adhesive.

2. The door drive (100) according to claim 1, It is characterized by: The permanent magnet (16) projects beyond the carrier (14) on a side facing away from the output shaft (13).

3. The door drive (100) according to claim 1 or 2, It is characterized by: The carrier (14) has a T-shape with respect to its circumferential cross section and / or an H-shape with respect to its half section, thereby forming an inner recess (22) into which a support element (23) is introduced.

4. The door drive (100) according to claim 1 or 2, It is characterized by: The driven shaft (13) is formed with a rotor receiving section (24), a carrier (14) equipped with the permanent magnet (16) is applied to the rotor receiving section and / or the driven shaft (13) has a first bearing section (25) and a second bearing section (26), a bearing element (23) being respectively received on the first bearing section and the second bearing section, wherein the rotor receiving section (24) is formed between the first bearing section (25) and the second bearing section (26).

5. The door drive (100) according to claim 1 or 2, It is characterized by: The carrier (14) is made of a metallic sintered material or a cast material.

6. Door drive (100) according to claim 1 or 2, It is characterized by: A film-shaped retaining body is applied to a carrier (14) equipped with the permanent magnet (16).

7. Door drive (100) according to claim 6, It is characterized by: The film-like holding body has an insulating tube made of polyester film and can be shrunk onto a carrier (14) equipped with the permanent magnet (16).

8. The door drive (100) according to claim 6, It is characterized by: The film-shaped holding body is formed by a wound body composed of a glass fiber film or a glass fiber fabric.

9. The door drive (100) according to claim 1 or 2, It is characterized by: The output shaft (13) extends in sections away from an end face (28) of the housing (10), so that a belt pulley (27) is attached to the section of the output shaft (13).

10. The door drive (100) according to claim 1 or 2, It is characterized by: The adhesive material used for adhering the permanent magnet (16) to the carrier (14) of the rotor (12) comprises acrylic adhesive and / or forms an anaerobic adhesive material.

11. A door installation having a door drive (100) according to any one of the above claims, having at least one connecting element and / or at least one door leaf element for connection to a door leaf element, the door drive (100) being effectively connected to the door leaf element in a driving manner.

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