Automatic drive and revolving door with such an automatic drive

Abstract

The invention relates to an automatic drive 1 for a revolving door, in particular for a smoke and / or fire protection door. The automatic drive 1 comprises an electric drive unit 3, a control unit 11, and a gearbox 5. The electric drive unit 3 comprises an electric motor 100 with a motor housing, a stator 106 with magnetic coils 114, and a rotor 102 with a set of first permanent magnets 104 arranged circularly around the stator 106 for generating a drive torque. The electric motor 100 has a rotary encoder arranged inside the motor housing, which comprises a magnetic sensor device 108 and an encoder track detectable by the magnetic sensor device 108, consisting of a set of second permanent magnets 110, which are rotationally fixed to the rotor 102.The control unit 11 is coupled to the magnetic sensor device 108 and is designed to control the magnetic coils 114 of the stator 106 based on the output signal of the magnetic sensor device 108.

Description

[0001] The present invention relates to an automatic drive for a revolving door and a revolving door with such an automatic drive.

[0002] An automatic drive for a revolving door, in particular for a smoke and / or fire protection door, conventionally comprises a drive unit designed to actively pivot the revolving door from its closed position to its open position and / or to hold it in its open position when installed, a control unit for controlling the electric drive unit and a gearbox that couples the electric drive unit to a rotatably mounted output shaft of the automatic drive.

[0003] Controlling revolving door drives requires determining the opening angle of the door. This necessitates an encoder. The encoder can be located on the electric motor of the drive unit or within the gearbox. It typically consists of a magnetic or perforated disk attached to the motor shaft or a gear wheel and an electronic circuit board that counts the rotational pulses and transmits them to the drive's control unit. However, this design requires a relatively large amount of installation space and is complex and expensive.

[0004] German patent application DE 10 2020 125 098 A1 relates to a method for pivoting a sash, in particular a door sash or a window sash, from a closed position at an opening angle of 0° to an open position at an opening angle greater than 0° and / or from the open position at an opening angle greater than 0° to the closed position at an opening angle of 0° by means of a sash torque, wherein the sash torque comprises a manual torque, in particular generated by a person, and a drive torque, wherein the drive torque is generated by means of a drive device with a drive module, a closing module and a control module, wherein the drive module comprises an electric machine comprising a stator, in particular a single stator and a rotor, in particular a single stator, and wherein the closing module comprises an energy storage device, in particular a mechanical one.wherein the control module comprises a control device, wherein the drive torque includes a machine torque generated directly or indirectly by the electric machine and a closing torque generated by the closing module. The machine torque is greater than 0 Nm at at least one of the opening angles greater than 0°. German patent application DE 10 2020 125 098 A1 also relates to a drive device for carrying out the method.

[0005] The publication DE 20 2008 003 106 U1 relates to a drive for automatic sliding doors, wherein a motor has a drive pinion which drives a toothed belt, wherein the toothed belt runs over a deflection pulley which is fixedly arranged on the opposite side of the drive pinion, wherein the toothed belt has a driver which is connected to a carriage of the sliding door, and wherein the drive pinion is arranged directly on a drive shaft of a permanent magnet excited synchronous motor designed as an external rotor motor.

[0006] Against this background, it is an object of the present invention to provide a compact and cost-effective automatic drive which nevertheless allows reliable determination and control of the opening angle of the revolving door driven by it.

[0007] This problem is solved by an automatic drive with the features of claim 1.

[0008] Beneficial further training opportunities can be determined based on the specific requirements.

[0009] According to the invention, an automatic drive for a revolving door, in particular for a smoke and / or fire protection door, comprises a drive unit designed to actively pivot the revolving door from its closed position to its open position and / or to hold it in its open position when installed. Furthermore, the automatic drive comprises a control unit for controlling the electric drive unit and a gearbox that couples the electric drive unit to a rotatably mounted output shaft of the automatic drive. The electric drive unit comprises an electric motor with a motor housing, a stator with magnetic coils, and a rotor with a set of first permanent magnets arranged circularly around the stator for generating a drive torque.The electric motor has a rotary encoder located inside the motor housing. This encoder comprises a magnetic sensor device and a sensor track, detectable by the magnetic sensor device, consisting of a set of secondary permanent magnets that are fixedly connected to the rotor. The control unit is coupled to the magnetic sensor device and is configured to control the stator's magnetic coils based on the output signal from the magnetic sensor device. The sensor track, consisting of the set of secondary permanent magnets, is arranged radially around a surface of the rotor perpendicular to a motor axis. The set of primary permanent magnets is arranged circumferentially along a side wall of the rotor that radially surrounds the motor axis.

[0010] Integrating the rotary encoder into the electric motor leads to cost savings and enables a particularly compact overall design, as a separate encoder is no longer required. The motor, with its integrated rotary motion monitoring, forms a single assembly and can be easily replaced in case of problems. The motor's rotation is directly coupled to the orientation of the output shaft, and thus to the opening angle of the revolving door, via the gearbox. This allows for reliable and precise control of the revolving door's opening angle. A separate magnetic or perforated disk is not necessary.

[0011] This type of design is particularly easy to manufacture and is also exceptionally robust and reliable. The magnetic sensor device can be attached to the stator.

[0012] Preferably, the electric motor is a DC motor, particularly a brushless one. A DC motor can be powered by a simple DC power source, such as a battery, which can be integrated into the automatic drive itself. This allows for a simple, self-sufficient power supply for the electric motor. A brushless motor is particularly efficient and durable.

[0013] The electric motor is preferably an external rotor motor. Compared to similar internal rotor motors, external rotor motors deliver particularly high torques. The direct generation of high torques by the electric motor allows the use of gearboxes with fewer gear stages, which ultimately saves installation space.

[0014] Preferably, the encoder track is formed by at least 40, and in particular between 80 and 120, secondary permanent magnets. The rotor of an electric motor typically comprises, for example, only 14 primary permanent magnets. This encoder track thus enables a significantly higher resolution for controlling the rotational movement of the motor, and therefore the revolving door, than would be possible using only the rotor's primary permanent magnets.

[0015] Preferably, the magnetic sensor device comprises at least one rigidly mounted Hall sensor. In particular, the magnetic sensor device comprises at least two, and preferably three, rigidly mounted Hall sensors. These Hall sensors are specifically aligned with the aforementioned sensor track. Hall sensors are relatively insensitive to water, dust, and dirt, which enables a reliable and robust overall design. The use of two Hall sensors makes it possible to determine the direction of rotation of the rotor or motor shaft. Furthermore, a third sensor can be used redundantly to take over the function of one of the other two Hall sensors in the event of failure. This enables a particularly robust and durable overall design.

[0016] Preferably, the gearbox is designed for the slip-free transmission of a rotational movement of the rotor of the electric motor of the electric drive unit to the output shaft, in particular solely via positive-locking gear stages. Such a design enables particularly precise and therefore reliable control of the opening movement of the revolving door. Positive-locking gear stages represent a particularly robust and durable method for achieving the slip-free transmission of the rotational movement.

[0017] Preferably, the transmission has three stages. The gear stages are preferably arranged axially offset from one another. In particular, the first gear stage is a toothed belt drive stage. In particular, the second gear stage is a helical gear drive stage, preferably with helical teeth. In particular, the third and final gear stage is a spur gear drive stage, preferably with spur teeth. A three-stage transmission has been identified as a good compromise between sufficient gear ratio and space savings for automatic drives for revolving doors. A toothed belt drive stage is relatively inexpensive. A helical gear drive stage offers particularly smooth operation and low noise. A spur gear drive stage, on the other hand, is particularly simple and therefore inexpensive. The combination of these three enables the creation of a particularly quiet and reliable, yet comparatively inexpensive, overall transmission.

[0018] Preferably, the driven gear of the last gear stage is rotationally fixed to the output shaft and is designed as a spur gear stage with at least one, and in particular exactly one, intermediate gear. The rotationally fixed coupling can be achieved, for example, by a positive fit between said driven gear and the output shaft, enabling a relatively compact yet robust overall design. The intermediate gear makes it possible to increase the distance between the output shaft and the second gear stage, thus creating space for a moving component of a return mechanism, in particular in the form of a piston, as known from purely mechanical door closers (see below), without the risk of the moving component colliding with the second gear stage.

[0019] Preferably, the automatic drive includes a reset mechanism with a non-electrical energy storage device. The reset mechanism is designed to actuate the revolving door towards its closed position when installed. In particular, the non-electrical energy storage device is coupled to the output shaft via a component movable perpendicular to the axis of rotation of the output shaft. For example, such a reset mechanism can correspond to or be modeled on a reset mechanism of a purely mechanical door closer. Specifically, the reset mechanism can incorporate components such as a mechanical spring and / or a piston (as a moving component) from a reset mechanism of a purely mechanical door closer. Such a design is particularly robust, reliable, and cost-effective.

[0020] Preferably, the moving component in question is mounted on a rolling bearing. This design is particularly reliable and robust. In particular, a rolling bearing has the advantage over a sliding bearing of higher efficiency, as there is less friction. Compared to oil- or grease-lubricated sliding bearings, a rolling bearing is also less prone to failure during extended operation.

[0021] Preferably, the axis of rotation of the output shaft, one motor axis of the electric motor, and all rotational axes of the gears and pinions of the gearbox are aligned parallel to each other. Such a design is particularly clear and therefore easy to implement, as well as robust and reliable.

[0022] Preferably, the outer diameter of the electric motor of the electric drive unit, perpendicular to its motor axis, is larger than the length of the electric motor along its motor axis. This allows for a particularly flat yet powerful overall design. Alternatively or additionally, the electric motor of the electric drive unit is preferably designed to act as a generator when the revolving door pivots towards its closed position, in order to dampen the closing movement of the revolving door. Therefore, no hydraulic fluid is required for a damping effect of the automatic drive.

[0023] According to the invention, a revolving door, in particular a smoke and / or fire protection door, comprises a door frame, a door leaf which is pivotably suspended relative to the door frame between a closed position and an open position, a previously described automatic drive, and a linkage or a lever with a sliding block and a slide rail. The automatic drive is either fixed to the door frame and coupled to the door leaf via the linkage or the lever with the sliding block and the slide rail, or fixed to the door leaf and coupled to the door frame via the linkage or the lever with the sliding block and the slide rail.

[0024] Such a revolving door benefits from the advantages of the automatic drive used, as described above.

[0025] Preferably, the revolving door includes a previously described reset mechanism with a non-electrical energy storage device. The non-electrical energy storage device of the reset mechanism is designed to be charged with energy by an opening movement of the door leaf, which is initiated or at least assisted by the electric drive unit. After the door leaf is released, the stored energy is used to pivot it back into its closed position. This design is particularly reliable, yet cost-effective and functional. Closing the door using the stored energy reliably prevents failure of the reset mechanism, especially if caused by a power outage.

[0026] The invention is described below by way of example with reference to the accompanying drawings. These show, Fig. 1 an automatic drive for a revolving door according to a first embodiment of the present invention without housing and panels from above; Fig. 2 the automatic drive off Fig. 1 from diagonally below; Fig. 3. Turn off the automatic drive Fig. 1 with housings and apertures shown in a longitudinal section along the output shaft; Fig. 4. Turn off the automatic drive Fig. 1 with housings and apertures shown in a cross-section at the level of the output shaft; Fig. 5 the automatic drive off Fig. 1 with lever mounted; Fig. 6 on the left the driven gear of the last gear stage, on the top right the output shaft with its pinion and on the bottom right the moving component of the automatic drive. Fig. 1; Fig. 7 a variation of the automatic drive from Fig. 1 with mounted frame; Fig. 8 on the left the driven gear of the last gear stage, on the upper right the output shaft with its pinion and on the lower right the moving component of the automatic drive. Fig. 7; and Fig. 9 A schematic drawing of the components of an exemplary electric motor as an electric drive unit for the automatic drives shown.

[0027] In the Fig. 1 and Fig. 2 is an automatic drive 1 for a revolving door, in particular for a smoke and / or fire protection door, with housings and covers not shown.

[0028] The automatic drive 1 comprises an electric drive unit 3, which is coupled to an output shaft 7 via a gearbox 5. A return mechanism 9 is also coupled to the output shaft 7. For controlling the electric drive unit 3, the automatic drive 1 further includes a control unit 11. All these components are mounted, in particular via housings, on a base body 13, which is designed for attaching the automatic drive 1 to a door leaf or door frame of the respective revolving door.

[0029] Accordingly Fig. The drive unit 3 comprises an electric motor 100, in this case a brushless external rotor DC motor 100 with a motor housing (not shown) and a motor shaft M. The electric motor 100 further comprises a rotor in the form of a bell 102 with a set of (for example, 14) first permanent magnets 104, which are arranged circularly around a stator 106 with (for example, 12) magnetic coils 114. The commutation of the electric motor 100 is sensor-controlled, wherein a magnetic sensor device 112 consisting of three Hall sensors, each offset from one another by 120°, of which only one is shown, is provided.

[0030] The BLDC motor 100 has a rated speed of approximately 3700-5600 revolutions per minute. Other DC motors have comparable rated speeds of 1500-2500 revolutions per minute. To achieve the same speed at the output shaft 7, the overall gear ratio of the gearbox 5 is approximately 500-600 instead of 250-300.

[0031] Furthermore, the motor 100 shown comprises a rotary encoder arranged within the motor housing, i.e., integrated into the motor. The encoder includes a magnetic sensor device 108 and a magnetic encoder track, which is detectable by the magnetic sensor device 108 and non-rotatably connected to the rotor 102. The magnetic sensor device 108 is aligned with the permanent magnets 110 of the encoder track. The magnetic sensor device 108 comprises two Hall sensors, which are arranged offset from each other by half the width of a second permanent magnet 110, and only one of which is shown. The encoder track, consisting of the set of second permanent magnets 110, is provided radially circumferentially on a top surface 102a of the rotor 102 perpendicular to the motor axis M, and the set of first permanent magnets 104 is provided circumferentially along a side wall 102b of the rotor 102, which radially surrounds the motor axis M.

[0032] The control unit 11 is coupled to the magnetic sensor device 108 and is configured to receive and evaluate an output signal from the magnetic sensor device 108 of the electric motor 100. Specifically, based on the output signal from the magnetic sensor device 108, the control unit 11 regulates the rotational movement of the rotor 102 of the motor 100 and thus of the output shaft 7, which is coupled to the electric motor 100 of the drive unit 3 via the gearbox 5. Based on the acquired information, the control unit 11 supplies the magnetic coils 114 of the stator 106 with current to precisely rotate the rotor 102 and thus the output shaft 7.

[0033] Thus, reliable and precise control of the rotary motion of the output shaft 7 of the automatic drive 1 is achieved in a very small installation space. In particular, it is then not necessary to provide a separate magnetic or perforated disk in the automatic drive.

[0034] Preferably, the sensor track is formed by at least 40, in particular between 80 and 120, second permanent magnets 110.

[0035] The transmission 5 comprises three interconnected transmission stages 15, 17, and 19. A drive shaft 21 of the electric drive unit 3, rotatably mounted about the motor axis M, is rotaryally coupled to a pulley 25 via a belt 23 to form the first transmission stage 15, which is a belt-driven stage. The belt 23 can be a toothed belt. The pulley 25 is rotationally fixed to a first pinion 26, and both are rotatably mounted about a first axis of rotation R1. This first pinion 26 meshes with a first gear 27, which is rotatably mounted about a second axis of rotation R2, to form the second transmission stage 17, which is a helical spur gear stage. The first gear 27 is rotationally fixed to a second pinion 29.This second pinion 29 meshes with a spur gear intermediate 31 to form the third and final gear stage 19, which itself meshes with a second gear 33. The intermediate gear 31 is rotatably mounted about a third axis of rotation R3. The second gear 33 is rotatably mounted about a fourth axis of rotation R4 on a sleeve 37 of a housing cover of the gearbox housing 39 via a rolling bearing 35 in the form of a ball bearing.

[0036] The second gear 33 includes a central funnel-shaped projection 41 (cf.: Fig. 4), in the neck of which a central recess 34 is formed, which is formed in the opposite direction to a pinion 43 formed on the output shaft 7 (cf.: Fig. 6, Fig. 8) The second gear 33 is pushed onto the output shaft 7. The teeth of the pinion 43 of the output shaft 7 are machined on the side facing the second gear 33 to reduce the tooth height (by machining) and create an axial stop for the second gear 33. Thus, the second gear 33 is rotationally locked to the pinion 43 and consequently to the output shaft 7 by forming a splined connection. The output shaft 7 is rotatably mounted relative to the gearbox housing 39 via a lower roller bearing and an upper roller bearing 45, each in the form of a needle bearing, so that one axis of rotation A of the output shaft 7 coincides with the fourth axis of rotation R4 (cf.: Fig. 3) The motor axis M, the rotation axes R1 to R3 and the rotation axis R4 or the rotation axis A are arranged, in particular along a common plane, opposite each other but parallel to each other.

[0037] The lower rolling bearing 45 of the output shaft 7 is provided on the previously described sleeve 37 of the gearbox housing 39 in the same plane (i.e. at the same height) as the rolling bearing 35 of the second gear 33 (cf.: Fig. 4) Thus, the rolling bearing 35 of the second gear 33 surrounds the lower rolling bearing 45 of the output shaft 7, forming a particularly compact configuration. Alternatively, the rolling bearing 35 of the second gear 33 could also surround the upper rolling bearing 45 of the output shaft 7. The designations lower rolling bearing 45 and upper rolling bearing 45 refer to the in Fig. 4. Orientation of the automatic drive shown 1.

[0038] This special design requires a preferred case height of 70 mm.

[0039] In the embodiment described here, the second gear 33 functions as the driven gear of the last gear stage 19 within the meaning of the present invention. It should be noted that in a case where a transmission 5 with only a single gear stage is provided, this single gear stage would also be considered the last gear stage within the meaning of the present invention.

[0040] The drive shaft 21 of the electric drive unit 3 is rotationally fixed to the output shaft 7 via the gearbox 5 in a predetermined fixed transmission ratio, which allows the electric drive unit 3, when mounted on a revolving door, to actively pivot it and / or hold it in a specific position, in particular in its open position.

[0041] To automatically pivot the revolving door into its closed position, the automatic drive 1 shown here includes the reset device 9.

[0042] The specific structural design and functionality of this reset device 9 will be described in more detail below.

[0043] How particularly good in Fig. As shown in Figure 1, the reset device 9 implemented here comprises a movable component 49 and a mechanical, non-electrical energy storage device 51 in the form of a helical spring. One (left) end of the helical spring 51 is supported on a spring plate 53, the axial position of which is adjustable via a worm gear 55. The other (right) end of the helical spring 51 presses against the movable component 49 perpendicular to the axis of rotation A of the output shaft 7. The preload of the helical spring 51 can be adjusted via a screw movement on the worm gear 55.

[0044] The movable component 49 is designed in this case as a piston or in the manner of a piston, which together with the coil spring 51 is located in a bore within a corresponding piston housing 57 (cf.: Fig. 3) is provided. The piston housing 57 is a piston housing 57 in which the movable component 49 is movably mounted perpendicular to the axis of rotation A of the output shaft 7. The movable component 49 has a clearance of preferably 0.1 to 0.2 mm to the inner surface of the piston housing 57 and may be grease-lubricated. The control unit 11 is attached to the base body 13 via the piston housing 57.

[0045] For the support of the movable component 49, three rollers 59 are provided, arranged side by side and parallel to each other along the axial direction of movement of the movable component 49. The roller axes RA1 to RA3 of the rollers 59 are all oriented perpendicular to the axial direction of movement of the movable component 49 and lie spaced apart from each other in a common plane. They are each rigidly connected translationally to the gearbox housing 39 via a needle sleeve 60a and a corresponding cylindrical bolt 60b (see: Fig. 4) The radially circumferential running surfaces 59a of the rollers 59 mounted on roller bearings are shaped in the opposite direction to a corresponding running surface 49a on the moving component 49 and bear against it. Specifically, the running surface 49a of the moving component 49 is convex transversely, and in particular perpendicularly, to the axial direction of movement of the moving component 49, and the running surfaces 59a of the rollers mounted on roller bearings 59 are correspondingly concave. This enables a particularly reliable and stable mounting of the moving component 49.

[0046] As an alternative to the embodiment shown with three roller-bearing rollers 59 arranged in one plane, more or fewer roller-bearing rollers 59, which in particular do not necessarily have to be in a single plane, can also be provided to support the movable component 49.

[0047] For coupling with the pinion 43 of the output shaft 7, the movable component 49 has an opening 61 through which the pinion 43 of the output shaft 7 passes. The movable component 49 has an axially extending rack section 63 along the inner wall of this opening 61. The teeth of this rack section 63 are in permanent engagement with the teeth of the pinion 43 of the output shaft 7, in order to couple the movable component 49, and thus the return mechanism 9, to the output shaft 7 via a rack and pinion drive 65 thus formed.

[0048] The following describes the integration of the above-described automatic drive 1 into a revolving door, in particular into a smoke and / or fire protection door.

[0049] A revolving door with a corresponding automatic drive 1 comprises a door frame and a door leaf suspended so that it can pivot relative to the door frame. The door leaf can pivot between a closed and an open position. The automatic drive 1 described above is fixed or attached to the door frame and the door leaf via its base 13. Depending on the specific application, either an upper or a lower end of the output shaft 7 is non-rotatably connected to a first end 67a of a lever 67 (see: Fig. 5) The second end 67b of the lever 67 is rotatably coupled to a sliding block (not shown). The sliding block is slidably mounted along a sliding rail (not shown), the sliding rail being fixed or attached to the other side by the door frame and the door leaf.

[0050] The functionality of the described automatic drive 1 in such a revolving door, in particular in a corresponding smoke and / or fire protection door, will now be briefly described.

[0051] Initially, the door leaf is in its closed position, thus closing the opening of the revolving door framed by the door frame. At this point, the automatic drive 1 is in the position shown in the Fig. State shown in 1 to 3.

[0052] To allow passage through the revolving door, the door leaf is pivoted from its closed position to its open position by a corresponding control signal to the electric drive unit 3. During this opening movement, the output shaft 7 with its pinion 43 rotates about the axis of rotation A. Via the rack and pinion drive 65, which acts between the pinion 43 of the output shaft 7 and the moving component 49, this rotational movement of the output shaft 7 results in a translational movement of the moving component 49 perpendicular to the axis of rotation A of the output shaft 7 (to the left). Fig. 1 to 3). This in turn leads to a compression of the coil spring 51 and thus to a charging of it with potential energy.

[0053] A driving force from the drive unit 3, which is generated to open and / or subsequently keep the revolving door open, is transmitted via the gearbox 5 to the output shaft 7.

[0054] As soon as the door leaf is released, in particular by the motor of the electric drive unit 3 no longer being energized, the coil spring 51, using the previously absorbed potential energy, pushes the movable component 49 back into its original position perpendicular to the axis of rotation A of the output shaft 7 (i.e., to the right). Fig. 1 to 3).

[0055] Due to the rack and pinion drive 65, this leads to a rotation of the output shaft 7 in the opposite direction to the previous rotation and thus to a pivoting of the door leaf back into its closed position.

[0056] The intermediate gear 31 of the last gear stage 19 of the gearbox 5 creates the installation space necessary for the free movement of the moving component 49. In particular, the intermediate gear 31 enables the further gear stages 15 and 17 of the gearbox 5 as well as the electric drive unit 3 to move away from the output shaft 7 (into the Fig. (1 to 3 to the right).

[0057] The roller bearings 59, on the other hand, serve to provide the axially movable component 49 with the lowest possible friction while still ensuring reliability. A rolling bearing is less prone to friction than a sliding bearing.

[0058] This results in a particularly space-saving, reliable and cost-effective overall design.

[0059] In particular, the revolving door can be designed to open automatically with each use and then immediately close again automatically. Such doors are known, for example, from hospitals, where a separate button may be provided to activate the electric drive unit 3 for opening the revolving door. In such a configuration, the energy storage device 51 of the reset mechanism 9 is charged with each opening. When the door closes, the motor of the drive unit 3 can be operated as a generator, thereby decelerating or dampening the closing movement. This eliminates the need for a separate damping hydraulic system. Before closing, the revolving door can, if necessary, be held open for a predetermined time by the drive unit 3 or a holding device. It would also be conceivable for the drive unit 3 to hold the revolving door permanently open.

[0060] Finally, it should be noted that in the embodiment described above, the driven gear 33 of the last gear stage 19, the pinion 43 of the output shaft 7 and the movable component 49 are connected in Fig. The embodiment shown in Figure 6 exhibits this feature. Specifically, the pinion 43 of the output shaft 7 is designed with a non-uniform rotational shape. The recess 34 in the second gear 33 and the opening 61 with the rack section 63 in the movable component 49 are correspondingly non-uniform, in particular with a wave-like shape. This specific design of the component shown in Figure 6 is described in Figure 6. Fig. The 6 components shown are based on the ones in Fig. Figure 5 shows the application of the automatic drive 1 in a revolving door with a lever 67, a sliding block (not shown), and a guide rail (not shown). This irregular shape allows the torque characteristic of the automatic drive 1 to be adapted to the requirements of such revolving doors in a particularly simple and reliable manner.

[0061] Alternatively to the one in Fig. In addition to the coupling shown in Figure 5 using a lever 67 with a sliding block and a sliding rail, other configurations are possible in which the automatic drive 1 is coupled to the door frame or the door leaf via a linkage 69.

[0062] As for example in Fig. As shown in Figure 7, such a linkage 69 comprises, for example, a first arm 71, which is non-rotatably connected at its first end 71a to the output shaft 7 and at its second end 71b, opposite the first end 71a, is coupled via a pivot joint to a first end 73a of a second arm 73. The second end 73b of the second arm 73, opposite the first end 73a, is coupled via a further pivot joint to a foot 75 of the linkage 69. The foot 75 is designed to be fixed immovably to the door frame or the door leaf in order to couple the automatic drive 1 to it.

[0063] In order to obtain an advantageous torque characteristic in such an embodiment with a linkage 69, the pinion 43 of the output shaft 7 is preferably designed to be rotationally symmetrical. Accordingly, the recess 34 in the second gear 33 is also designed to be rotationally symmetrical, and the rack section 63 in the opening 61 of the movable component 49 is designed to be uniform, in particular straight. Such an embodiment is exemplified in Fig. 8 shown.

[0064] By specifically choosing the design or by simply exchanging the three in the Fig. 6 and Fig. The automatic drive 1 formed by the components 33, 43 and 49 shown in Figure 8 can be adapted to the specific intended use (i.e., either with a slide rail-mounted lever 67 or with linkage 69) without requiring extensive modification of the other components of the automatic drive 1.

[0065] Finally, it should be noted that, in light of the above description of the exemplary embodiments, a person skilled in the art would readily think of a multitude of obvious combinations and / or equivalent modifications thereof. Such combinations may not be explicitly described here, but are nevertheless covered by the scope of protection of the accompanying claims. Reference symbol list 1 automatic drive 3 electric drive units 5 gearboxes 7 Output shaft 9 Reset device 11 Control unit 13 basic shapes 15 first gear stage 17 second / middle gear stage 19 third / last gear stage 21 Drive shaft 23 belts 25 Pulley 26 first sprocket 27 first gear 29 second sprocket 31 Intermediate wheel 33 second / driven gear 34 recess 35 Rolling bearings of the second gear 33 37 Sleeve 39 Gearbox housing 41 lead 43 Output shaft pinion 7 45 lower and upper roller bearing 49 moving component / piston 49a Running surface along the moving component 49 51 Energy storage / Coil spring 53 Printing plate 55 threaded bodies 57 Piston housing 59 roller bearing 59a Running surface along the roller bearing 59 60a Needle sleeve 60b Cylinder bolt 61 Breakthrough 63 Rack section 65 Rack and pinion gears 67 levers 67a first end 67b second end 69 rods 71 first arm 71a first end 71b second end 73 second arm 73a first end 73b second end 75 feet 100 electric motor 102 Rotor / Bell 104 first permanent magnets 106 Stator 108 Magnetic sensor device 110 encoder track / second permanent magnets 112 Magnetic sensor device 114 Magnetic coil A axis of rotation of the output shaft M motor axle R1 first axis of rotation R2 second axis of rotation R3 third axis of rotation R4 fourth axis of rotation RA1 first roller axle RA2 second roller axle RA3 third roller axis

Claims

[1] Automatic drive (1) for a revolving door, in particular for a smoke and / or fire door, the automatic drive (1) comprising: an electric drive unit (3) which, in the assembled state, is designed to actively pivot the revolving door from its closed position to its open position and / or to hold it in its open position; a control unit (11) for controlling the electric drive unit (3); and a gear (5) which couples the electric drive unit (3) to a rotatably mounted output shaft (7) of the automatic drive (1), wherein the electric drive unit (3) comprises an electric motor (100) with a motor housing, a stator (106) with magnetic coils (114) and a rotor (102) having a set of first permanent magnets (104) arranged in a circle around the stator (106) for generating a drive torque, characterized by, that the electric motor (100) has a rotary encoder arranged within the motor housing, which has a magnetic sensor device (108) and a sensor track detectable by the magnetic sensor device (108) comprises a set of second permanent magnets (110) which are connected in a rotationally fixed manner to the rotor (102), wherein the control unit (11) is coupled to the magnetic sensor device (108) and is designed to control the magnetic coils (114) of the stator (106) based on the output signal of the magnetic sensor device (108), wherein the encoder track from the set of second permanent magnets (110) is provided radially circumferentially on a cover surface (102a) of the rotor (102) perpendicular to a motor axis (M), and the set of first permanent magnets (104) is provided circumferentially along a side wall (102b) of the rotor (102) radially surrounding the motor axis (M). [2] Automatic drive (1) according to claim 1, wherein the electric motor (100) is a, in particular brushless, DC motor. [3] Automatic drive (1) according to claim 1 or 2, wherein the electric motor (100) is an external rotor motor. [4] Automatic drive (1) according to one of the preceding claims, wherein the encoder track is formed by at least 40, in particular between 80 and 120, second permanent magnets (110). [5] Automatic drive (1) according to one of the preceding claims, wherein the magnetic sensor device (108) comprises at least one immovably mounted Hall sensor, in particular at least two and preferably three immovably mounted Hall sensors. [6] Automatic drive (1) according to one of the preceding claims, wherein the gear (5) is designed for the slip-free transmission of a rotational movement of the rotor (102) of the electric motor (100) of the electric drive unit (3) to the output shaft (7), in particular only via positive gear stages (15, 17, 19). [7] Automatic drive (1) according to one of the preceding claims, wherein the gear (5) is designed in three stages, wherein the gear stages are preferably arranged axially offset from one another, wherein the first gear stage (15) is in particular a toothed belt gear stage, wherein the second gear stage (17) is in particular a, preferably helical, spur gear stage, wherein the third and last gear stage (19) is in particular a spur gear stage, preferably with straight teeth. [8] Automatic drive (1) according to claim 7, wherein the driven gear of the last gear stage (19) is rotationally fixedly connected to the output shaft (7) and is designed as a spur gear stage with at least one, in particular exactly one, intermediate gear (31). [9] Automatic drive (1) according to one of the preceding claims, wherein the automatic drive (1) comprises a reset device (9) with a non-electrical energy storage device (51), wherein the return device (9) is designed to act on the revolving door in the direction of its closed position when mounted, wherein it is provided in particular that the non-electrical energy store (51) is coupled to the output shaft (7) via a component (49) that is movable perpendicular to the axis of rotation of the output shaft (7). [10] Automatic drive (1) according to claim 9, wherein the movable component (49) is mounted on roller bearings. [11] Automatic drive (1) according to one of the preceding claims, wherein the rotational axis (A) of the output shaft (7), a motor axis (M) of the electric motor (100) and all rotational axes (R1, R2, R3, R4) of the gears (27, 31, 33) and pinions (26, 29) of the transmission (5) are aligned parallel to one another. [12] Automatic drive (1) according to one of the preceding claims, wherein the outer diameter of the electric motor (100) of the electric drive unit (3) transversely to its motor axis (M) is greater than the length of the electric motor (100) along its motor axis (M), and / or wherein the electric motor (100) of the electric drive unit (3) is designed to act as a generator when the revolving door is pivoted in the direction of its closed position in order to dampen a closing movement of the revolving door. [13] Revolving door, in particular smoke and / or fire door, comprising: a door frame; a door leaf pivotally mounted relative to the door frame between a closed position and an open position; an automatic drive (1) according to one of the preceding claims; and a rod (69) or a lever (67) with a sliding block and a sliding rail; wherein the automatic drive (1) is either fixed to the door frame and connected via the rod (69) or the lever (67) to the sliding block and the slide rail is coupled to the door leaf, or is fixed to the door leaf and coupled to the sliding block and the slide rail via the rod (69) or the lever (67) to the door frame. [14] Revolving door according to claim 13 with a return device (9) according to claim 9, wherein the non-electrical energy storage device (51) of the return device (9) is designed to be charged with energy by an opening movement of the door leaf, which is caused or at least supported by the electric drive unit (3), and after a release of the door leaf, to pivot it back into its closed position with the aid of the charged energy.

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