EP2633142B1 - Door drive and control method therefor - Google Patents

Description

The invention relates to a door drive for driving a gate with an electric motor unit and a transmission device for transmitting driving forces of the electric motor unit to a driven element of the gate, wherein the electric motor unit is designed as a geared motor having an electric motor and a self-locking motor gear.

Moreover, the invention relates to an advantageous control method for such a door drive.

From the WO 2010/009952 A1 is a modular so-called Wellentorantrieb known, which is designed for direct driving a present at a gate to be driven Torwelle. Such a door shaft may for example be part of a weight compensation device and is connected, for example, with a torsion spring, which serves to balance the gate weight. The door shaft is connected by gearing to a gate to be moved, so that moves when turning the Torsionsfederwelle the gate between its open and closed position.

The from the WO 2010/009952 A1 known door drive has an electric motor unit and a transmission device. As a gear device is in the known door drive a traction mechanism, such as chain transmission, which connects an engine output shaft of the electric motor unit with an output shaft to be connected to the door shaft of the transmission device.

In the WO 2010/009952 A1 the transmission device is formed by selecting the output shaft of an assortment of output shafts. You can do that create different gear ratios, so as to adapt the door drive to different goals. Due to the adjustable gear ratio of the transmission device, the electric motor unit can be designed with relatively low peak power. The electric motor unit can therefore be designed as a particularly favorable geared motor. This geared motor has an electric motor, which derives its power via a self-locking motor gearbox, which is also part of the geared motor. Most such self-locking motor gear are designed as worm gear, wherein a worm is mounted on the shaft of the electric motor, which drives a seated on the output shaft of the electric motor unit gear. As a result, the motor gear is self-locking against forces exerted by the gate on the electric motor unit. This has the effect that on the one hand the gate is held over this self-locking gear and thus opposes unauthorized opening attempts; on the other hand, even when a spring or other element of a weight balancing device breaks, the raised leaf can not fall down.

Other examples of gate operators of the type mentioned are in the company brochure "garage and entrance gate drives - compatible drive solutions of Europe No. 1" of Hörmann KG sales company from April 2010 (printing notice as of 04.2010 / print 04.2010 / HF85945DE / G.XXX) described and shown garage door and entrance door drives. These are garage door operators, which are designed as drag drives, hinged door drives and sliding gate operators. In the trailing drives, the transmission device has a driver guided along a guide rail, which is connected in a gearbox to the engine output shaft of an electric motor unit designed as a corresponding geared motor. In the Drehtorantrieben a spindle gear is driven by a corresponding gear motor so as to produce a telescopic stroke, by means of which a Drehtorflügel is pivoted. In sliding gate operators, the motor output shaft of the geared motor drives a gate drive gear which meshes with a rack on the sliding gate.

For each of these different types of door drives with different transmission means for driving the different gates each designed as a geared motor with self-locking motor gear electric motor unit can be used for driving.

Many of these gate operators are controlled in terms of drive power and speed. For example, it is often the case that the gate wing, although slowly retracts in previously learned end positions, but moves much faster between these end positions. As a result, a gentle inlet of the door leaf can be achieved in its end position, yet the closing and opening process can be performed relatively quickly. A slow procedure in the area of the end positions also has the advantage that it can react more quickly to expected obstacles by switching off or reversing.

From the EP1 956 171 A1 For example, there is known a method of operating a door operator having a high speed mode and a normal mode of operation. In high-speed mode, the door is opened at a higher speed and closed at normal speed. In Normal Run mode, the door is opened and closed at normal speed. For this purpose, a load-dependent operating parameter of the door drive is determined with a sensor unit. As soon as the load-dependent operating parameter exceeds a limit value, the high-speed mode switches to a normal-running mode in order to prevent an overloading of the door drive. Determining the load-dependent operating parameter comprises measuring the temperature of a component of the door drive, namely in particular the motor or the power electronics. Thus, overheating of the power electronics or the windings of the motor can be avoided.

From the EP 2 206 865 A2 is a door drive with temperature measurement known. In this case, a temperature sensor is arranged in the region of a control and detects only the temperature of the control and of the electric motor in order to avoid overheating of the electrical units.

The GB 2 289 351 A deals with drives in another technical field, namely motor vehicle window drives. In this case, a temperature sensor is arranged in a transmission housing of a worm gear motor, which is primarily intended to detect the temperature range of the vehicle window, so as to determine whether the engine has to work against a large resistance. However, the temperature sensor is only used for temperature measurement if the engine has been operated only very slightly within 30 minutes, since otherwise the heat from the engine could falsify the ambient temperature measurement.

The WO 2005/116383 A1 discloses a door operator for driving a door with an electric motor unit and a transmission device for transmitting driving forces of the electric motor unit to a driven and with a transmission temperature monitoring device for monitoring a temperature of a transmission of the transmission device and a control device, which is connected to the transmission temperature detecting means to the electric motor depending on to control a detected by the transmission temperature detection means temperature of the transmission of the transmission unit. The trained as Wellentorantrieb door drive has an electric motor and a worm gear. In the WO 2005/116383 A1 It is about monitoring the frequency signals of the AC motor to determine whether it must work against a tough lubricant at low temperatures or not. If this is the case, the power supply is increased so as to add more heat to heat the lubricant. Further, a temperature sensor is provided which is intended to detect the ambient temperature so as to turn on or off the temperature control process in the first place.

The invention has now taken on the task of optimizing such door drives such that they deliver high durability and reliability despite cost-effective manufacturability.

This object is achieved by a door drive with the features of claim 1 and a control method with the steps of claim 7.

Advantageous embodiments of the invention are the subject of the dependent claims.

The invention provides a door operator for driving a door with an electric motor unit and a transmission device for transmitting driving forces of the electric motor unit to the gate, wherein the electric motor unit is designed as a geared motor having an electric motor and a self-locking motor gear. In particular, a drive shaft of the engine transmission is drivable by the electric motor to rotate an engine output shaft of the engine transmission, wherein the transmission means for receiving driving forces from the engine output shaft of the engine gear and for transmitting the driving forces to a driven element of the gate is trained. According to the invention, a motor gear temperature monitoring device is provided for monitoring a temperature of the motor gear.

For components of the self-locking engine transmission, materials which can be produced and processed at relatively low cost in recent times, such as, for example, Plastic materials used. In particular, it is preferable to produce a motor gear wheel of plastic, in particular high-strength plastic, which meshes with a worm gear and is seated on the output shaft of the electric motor unit. This has advantages in terms of manufacturing costs, but also in terms of possible noises and in terms of a smooth running. This allows relatively high forces to be transmitted during normal operation. Experiments have shown that, however, especially in the case of accidents, such as a failure of a counterbalancing device for the gate to be moved, thereby increased forces can lead to damage or even failure of the engine gearbox.

Experiments have shown that such failures are very rare in cold gear, but the risk of failure is particularly increased when the engine gearbox is particularly heated by an increased power requirement. In particular, in case of failure of a counterbalancing device or in other incidents that lead to a difficult run of the door leaf or the transmission device, a relatively rapid increase in temperature at the motor gearbox.

If it is then driven further with undiminished power, this can lead to a failure of the engine transmission and thus to a failure of the electric motor unit.

The danger of a failure is greater if, in the case of a heated engine transmission, a hard torque impact, as can occur, for example, when a weight-compensating spring breaks, acts on the self-locking engine transmission.

Although it has been known for some time, especially for motor vehicle applications available on the market electric motors, to monitor the electric motor itself (ie, for example, the rotor or the stator or commutators or the like) by a temperature switch, which at too high a temperature Shutdown of the electric motor leads. However, such a measure would not be sufficient for door drives to avoid failure of the electric motor unit in special load situations. Before you can determine a temperature increase on the electric motor, a significant increase in temperature has already occurred in the self-locking motor gearbox.

The invention therefore provides to monitor the temperature of this engine transmission by a monitoring device. This gives a further control parameter by means of which a control of the door drive can be carried out.

According to the invention, the drive is then controlled as a function of the monitored engine transmission temperature.

As a result, it is possible to keep the engine transmission temperature always in the uncritical temperature ranges for the stability of the respectively selected materials.

According to a first alternative of the invention, the procedure is such that the maximum power of the electric motor is reduced when the engine transmission temperature is elevated in order to avoid a further increase in the engine transmission temperature. If the engine transmission temperature reaches critical values which could lead to impairment of the material properties of the motor transmission elements, according to a further alternative of the invention, further operation of the electric motor is prevented. One can thus significantly reduce breaks or wear on the motor gear elements. Therefore, one can produce the transmission elements with less effort, for example, from less expensive materials, and yet ensure high reliability. According to the invention, therefore, a motor gear made of plastic is provided. This has particular advantages when the motor gear is a worm gear. Furthermore, this has particular advantages when a meshing with a worm of the worm gear output gear of the motor gear is made of plastic.

Preferably, it is provided that the motor unit comprises a housing having a motor gear housing portion in which the motor gear is housed, and with an electric motor housing portion in which the electric motor is housed, wherein the motor gear temperature monitoring means comprises a sensor device accommodated in the motor gear housing portion for detecting a temperature in the motor gear housing portion having. As a result, exactly the temperature within the motor gear housing is detected.

In the case of gate drives, it is customary to determine the door travel via a pulse generator which is coupled to a motor shaft. For this purpose, it is provided in a particularly advantageous embodiment of the invention that the motor gear is associated with a detection device for detecting a rotation of the motor gear, which has a rotation sensor for detecting a rotation of at least one rotating part of the motor gear. For example, here at least one Hall element could be provided to detect the rotation of a shaft of the electric motor, a rotation of a worm of a worm gear or the rotation of a driven by the worm, sitting on the output shaft of the motor gear. The rotation sensor could be a Hall sensor, which can be designed, for example, for detecting the rotational speed and the direction of rotation of one of the said rotating parts. It is now preferred in a particularly preferred embodiment of the invention to arrange a temperature sensing element of the engine transmission temperature detection device together with a rotation sensor. After any connection element and / or electronic element for detecting a rotation is present, the cost of providing a further connection element and / or electronic element for sensing the temperature is very low. For example, the same connections or different lines could be the same Connection for connecting the rotary sensor and a temperature sensor may be formed on a door drive control.

Particular advantages of the invention in a Wellentorantrieb in the WO 2010/009952 A1 There can be used by a suitable gear ratio in the transmission device and a relatively inexpensive gear motor for driving even larger goals. In the case of heavier gates, however, the danger is great that in the event of incidents, higher loads will be introduced on the electric motor unit. For example, when a torsion spring breaks, a large torque is generated on the door shaft. If a self-locking gearbox is then connected, it must cope with this torque shock.

With the invention can now ensure that the motor gear does not reach such temperatures where the material is already impaired so that such force peaks just can not be handled, but material damage would be possible or likely.

• Erfassen einer Motorgetriebetemperatur an dem Motorgetriebe und
• Steuern des Elektromotors in Abhängigkeit der erfassten Motorgetriebetemperatur.

The invention provides according to a further aspect thereof a control method for controlling a door drive for driving a gate, wherein the door drive is provided with an electric motor unit and a transmission device for transmitting driving forces of the electric motor unit to a driven element of the door, wherein the electric motor unit is designed as a geared motor having an electric motor and a self-locking motor gear. the control method being characterized by the steps of:

• Detecting a motor gear temperature at the engine gearbox and
• Controlling the electric motor as a function of the detected engine transmission temperature.

It is preferably provided that the temperature of a worm gear of the electric motor unit is monitored.

A first alternative of the control method according to the invention comprises the step of limiting an engine output of the electric motor when the engine transmission temperature exceeds a predetermined first threshold temperature.

According to a second alternative of the control method according to the invention, further operation of the electric motor is prevented when the engine transmission temperature exceeds a predetermined second threshold temperature.

Furthermore, the monitoring of the engine transmission temperature can of course also serve to output corresponding warning messages or explanatory messages. For example, via a display, a e.g. coded message are issued, which explains to the operator, why the electric motor suddenly runs only with low power or no longer drives. Or, a warning is issued that the engine transmission temperature is too high and that further operation should be discontinued for a while.

In a particularly preferred embodiment of the invention, a geared motor of a door drive is configured such that a temperature sensor, which measures the temperature of the motor gear, is seated on the screw of a self-locking electric motor gear. The software - for example, a controller - can monitor this temperature and at first set a slow speed at certain temperatures or switch off the drive if it is increased further. As a result, overheating of the engine gearbox can be avoided.

The motor gear according to the invention comprises a plastic wheel. Preferably, a high performance plastic, e.g. Delrin or Teflon, used, but the durability of such materials - as with other materials - temperature dependent.

In particular, tests have been carried out with spring break. If a spring, which is attached to a door shaft that is coupled to the motor gearbox, breaks, then this self-locking motor gearbox must withstand the corresponding force peaks.

An attempt was made to set a strength of the gearbox against spring breakage so that a certain high number of spring breaks could be endured on the same toothed segment. Calculating the peak forces back to the geared motor, torques in the range of three-digit Newtonmeter values can quite possibly arise at spring break.

At room temperature, the required number of spring breaks without damage was possible. In a further test with an engine gearbox temperature above 60 ° C, the engine gearbox has failed earlier. The inventors have thus discovered that the motor gearbox can be loaded differently depending on the temperature and that this could lead to a deterioration of the durability.

Therefore, according to the invention, a motor gear temperature is monitored to provide high reliability.

An advantage is that you can then produce significantly cheaper gear. On the one hand, less expensive materials can be used, which may have more temperature-dependent skills than other, more expensive materials. On the other hand, the motor gearbox can be designed for peak load at room temperature and need not be designed for peak loads in the heated state.

Fig. 1

eine schematische, teilweise geschnittene Seitenansicht auf ein Tor mit Torwelle und Wellentorantrieb,

Fig. 2

eine Ansicht auf einen Eckbereich des Tores von Fig. 1 vom Inneren des zu verschließenden Raumes aus gesehen, wobei der Anschluss des Wellentorantriebes an die Torwelle dargestellt ist;

Fig. 3

eine erste perspektivische Ansicht einer Basisstruktur des Wellentorantriebes;

Fig. 4

eine zweite perspektivische Ansicht der Basisstruktur des Wellentorantriebes;

Fig. 5

eine Darstellung der als Getriebemotor ausgebildeten Elektromotoreinheit;

Fig. 6

eine weitere Darstellung der Elektromotoreinheit mit geöffnetem Motorgetriebegehäusedeckel;

Fig. 7

eine weitere Darstellung der Elektromotoreinheit mit abgenommenem Motorgetriebegehäusedeckel; und

Fig. 8

eine Darstellung eines Details des Motorgetriebegehäusedeckels mit Temperatursensor und Drehsensoren.

An embodiment of the invention will be explained in more detail with reference to the accompanying drawings. It shows:

Fig. 1

a schematic, partially sectioned side view of a gate with Torwelle and Wellentorantrieb,

Fig. 2

a view on a corner of the gate of Fig. 1 seen from the interior of the space to be closed, wherein the connection of the Wellentorantriebes is shown to the door shaft;

Fig. 3

a first perspective view of a basic structure of the Wellentorantriebes;

Fig. 4

a second perspective view of the basic structure of the Wellentorantriebes;

Fig. 5

a representation of the designed as a geared motor electric motor unit;

Fig. 6

a further illustration of the electric motor unit with the engine gear housing cover open;

Fig. 7

a further illustration of the electric motor unit with removed motor gear housing cover; and

Fig. 8

a representation of a detail of the engine gear housing cover with temperature sensor and rotary sensors.

In the Fig. 1 and 2 is an automatically driven gate 10 with a door shaft 12 and designed as a Wellentorantrieb or direct drive door drive 14 is shown. The door drive 14 is attached to a door drive attachment 15.

The gate 10 has a movable in a guide 16 between a closing end position and an opening end position door leaf 18. The door shaft 12 is formed as part of a weight balancing device 20 and has a force storage, for example in the form of a torsion spring 22, which balances the weight of the door leaf 18 as far as possible during its movement. For this purpose, the door shaft 12 is coupled in a gear to the door leaf 18 such that the door shaft 12 rotates when moving the door leaf 18. In the example shown, this geared coupling is realized by cable drums 24 and wire ropes 26 that can be wound thereon.

The door operator 14 is connected to one end of the door shaft 12 for rotatably driving the same.

In the Fig. 1 and 2 further walls 28 of a building 30 are shown, which has a closable by the gate 10 door opening 32. The door drive 14 is manufactured in industrial mass production and is - as the closer in the WO 2010/009952 A1 described - adapted in its manufacture so that it is adaptable to different gates 10 and 30 different buildings with appropriate installation situations.

The door drive 14 has, as out Fig. 2 can be seen, a drive housing 34. The drive housing 34 has a plurality of hoods or covers 36, 37. In the actual drive housing 34, the drive elements are mounted on a support structure or base structure 40.

The Fig. 3 and 4 show the door operator 14 without the covers 36 and 37, so that the drive elements and the base structure 40 can be seen.

The door operator 14 has an electric motor unit 50 for supplying the driving force and a transmission device 100 which transmits the driving force of the electric motor unit 50 to an element of the door 10 to be driven.

In the example of a direct drive shown here, the transmission device 100 is designed to transmit the drive force to the door shaft 12. For example, in the embodiment of the door drive 14 provided here, a traction mechanism 94 is provided, which will be explained in more detail hereafter.

In the following, the construction of the basic structure 40 of the door drive 14 will first be explained in more detail. The base structure 40 has a first base structure part 42 and a second base structure part 44, which are detachably connected together at a fastening interface 46.

The first base structure part 42 is formed as a base plate or base plate 48. On the base plate 48, the electric motor unit 50, a Elektroanschlusseinheit 52, a decoupling device 54 and a decoupling sensor 56 are attached.

The electric motor unit 50 is designed as a gear motor 102 and has a motor housing 58, in which an electric motor 60 and a self-locking motor gear 61, for example in the form of a worm gear 62, are housed. Accordingly, a motor output shaft 64 of the electric motor unit 50 is connected to an output shaft of the worm gear 62. This motor output shaft 64 has, on the side of the base plate 48 opposite to the electric motor unit, a first gear of the transmission device 100, e.g. in the form of a first sprocket 66.

The electrical connection unit 52 has a power unit 68 with transformer and power electronics and a control device 70 which controls the electric motor 50 via the power unit 68. In another embodiment, not shown here, the electrical connection unit 52 has only the power unit 68. The control device 70 is then housed in a separate control housing (not shown), which is fixed in the area of the door drive 14 fixed.

By means of the decoupling device 54, the first gear - eg sprocket 66 - the transmission device 100 of the motor gear 61 can be decoupled, so that the transmission device 100 can rotate freely in the uncoupled state, while it is held in the engaged state by the self-locking motor gear 61. The uncoupling device 54 has a manually actuated by not shown actuating elements coupling pin 72, which is controlled by a cam 74 axially movable upon rotation. This axial movement is transmitted to the chain sprocket 66 or the motor output shaft 64, on which the sprocket 66 sits, via a coupling element acting as a lever element, so that the sprocket 66 or the motor output shaft 64 can be moved in the axial direction out of engagement with the motor gear 61 , Of the Uncoupling sensor 56 detects a movement of the clutch pawl 76 and thus a decoupling process.

The electric motor unit 50 further has a rotation detecting device 104 for detecting a rotation of the motor gear 61. For example, a rotation sensor 105, e.g. in the form of a two-channel Hall sensor, provided with the rotation of the output shaft of the worm gear 62 is detected. In particular, this direction of rotation and further rotational speed can be detected by angular momentum. As a result, by counting the pulses, the position of the connected gate - e.g. Door leaf 18 - be detected. This position and in particular the end positions of the gate leaf can be taught by performing a learning trip after the first commissioning.

The control device 70 is designed such that upon receipt of a signal of the uncoupling sensor 56, which indicates a re-established after a disengaging clutch state, a new reference run for the gate 10 is performed, in which the position, in particular at least one of the end positions of the door leaf 18 are taught again.

The second base structure part 44 is likewise designed as a plate, which can be connected to the base plate 48 via the attachment interface 46. The second base structure part 44 has an output shaft 80 of the door drive 14, which is rotatably mounted on a bearing 82 arranged at a certain radial distance from the motor output shaft 64. The output shaft 80 has on one side a shaft coupling 84 with a connection part 86, which can be placed on the end of the door shaft 12. A radially inwardly facing projection 88 engages when placed on an existing on the door shaft 12 longitudinal groove 90 (FIG. Fig. 2 ), so that the connecting part 86 rotatably seated on the Torwelle 12.

At the other end, the output shaft 80, a second gear of the transmission device 100, for example in the form of a second sprocket 92, on. The Both gears on the engine output shaft 64 and the output shaft 80 of the transmission device 100 are connected via the traction mechanism 94 with each other geared. The traction mechanism 94 has, for example, a drive chain 96.

As this more detailed in the WO 2010/009952 A1 , to which reference is expressly made for further details has been described, can be changed by selecting or replacing the second base structure part 44, each with a different diameter of the second gear of the transmission device 100, the transmission ratio of the transmission device 100 and thus adapt to the drive tasks. As a result, it is possible to resort to a relatively inexpensive electric motor 60 for constructing the electric motor unit 50.

In the following, the electric motor unit 50 used here will be described with reference to the diagrams in FIGS Fig. 5 to 8 explained in more detail.

The motor housing 58 of the electric motor unit 50 has a motor gear housing portion 106 and an electric motor housing portion 108. In the motor gear housing portion 106, the motor gear 61 is housed. In the electric motor housing portion 108 of the electric motor 60 is housed. The motor gear housing portion 106 has a detachable gear cover 110. While the electric motor unit 50 in Fig. 5 is shown with attached and fixed gear cover 110, the gear cover 110 in the illustrations of Fig. 6 . 7 and 8 from the remainder of the engine gearbox housing portion 106.

As in Fig. 5 can be seen, on the gear cover 110 on the outside of an electrical connection 112 of the rotation detection device 104 is provided where the signals of the rotation sensor 105 can be tapped.

The electric motor unit 50 further has a motor gear temperature monitor 120, with which a temperature of the motor gear 61 can be monitored.

As in particular from Fig. 6 As can be seen, the motor gear 61 has a connected to the rotor of the electric motor 60 screw 122 and a motor gear 124, which meshes with the screw 122. The motor gear 124 forms the part of the output shaft of the worm gear 62. The motor gear 124 is made of plastic, in particular high-performance plastic formed.

Particularly at high loads, the motor gear 61 is strongly heated by friction, which can lead to a deterioration in the material strength of parts of the engine gear 61, in particular of the motor gear 124.

In the embodiment shown here, heating of the engine transmission 61 can be detected by means of the engine transmission temperature monitoring device 120. Are the engine gear temperatures in one - z. B. empirically detectable - critical area, the controller 70 may reduce the maximum power of the electric motor 60 accordingly, so that the door drive 14 now the door leaf 18 can move only slowly. This will prevent further heating. If the engine transmission temperature is in an even higher range, the control device 70 can also completely stop the electric motor 60 until the engine transmission temperature has returned to normal.

To detect the engine transmission temperature, the engine transmission temperature monitor 120 includes a temperature sensor 126 that detects the temperature within the engine transmission housing portion 106.

In the illustrated embodiment, the temperature sensor 126 is seated together with the rotation sensor 105 on a common board 128. In this way, the manufacturing and installation costs for the motor gear temperature monitor 120 can be kept low and the connection of the temperature sensor 126 to the controller 70 can via the same terminal 112 as take place for the rotation sensor 105.

Fig. 4 Accordingly, FIG. 1 shows the gear motor 102 with the gear cover 110 mounted as a DC motor. In a plastic insert 130, the terminal 112 is provided with a 6-pin terminal strip for two Hall sensors (rotation sensor 105) and the temperature sensor 126.

In Fig. 6 the gear cover 110 is unscrewed and set aside. It can be clearly seen that the sensors 105, 126 are positioned directly above the worm shaft - worm 122 - in the installed state.

Fig. 7 shows another view of the unscrewed gear cover. Here the contacting of the motor connections is better recognizable. The motor connections can be recognized by two elongated pin lugs 132 in another plastic insert 134. Further, a metal pin 136 is provided, which serves only for positioning purposes.

How out Fig. 5 As can be seen, by the proximity of the two plastic inserts 130, 134 is a proximity of the terminal 112 for the sensors 105, 126 to the motor terminals 132 so that a faster connection of both the electric motor 60 and the sensors 105, 126 can be done.

In Fig. 8 is a detailed view of the sensors 105, 126 shown. The temperature sensor 126 shown above in the image is an NTC resistor in the example shown here, in particular in the range 3 to 6 kOhm.

At the bottom of the picture, the two Hall sensors 138, 140 of the rotation sensor 105 for the speed detection and direction of rotation detection are clearly visible.

Although the invention has been explained with reference to a designed as Wellentorantrieb gate operator 14, the invention is not limited to this Torantriebs design. Other embodiments result from the fact that the garage door and entrance gate drives, the attached in the aforementioned and the application as part of the disclosure company brochure "garage and Entrance gate drives - compatible drive solutions of Europe No. 1 "of the Hörmann KG sales company from April 2010 (printing notice as of 04/2010 / druck 04.2010 / HF 85945DE / G.XXX) are shown and described, with a corresponding geared motor 102, as in the Fig. 5 to 8 and a correspondingly modified control device are provided with engine transmission temperature monitoring.

LIST OF REFERENCE NUMBERS

10

gate

12

door shaft

14

door drive

15

Torantriebsbefestigung

16

guide

18

door leaf

20

Weight balancer

22

torsion spring

24

cable drum

26

wire ropes

28

wall

30

building

32

door opening

34

drive housing

36

cover

37

cover

40

base structure

42

first basic structure part

44

second base structure part

46

Mounting interface

48

baseplate

50

Electric motor unit

52

Electrical connection unit

54

Uncoupling

56

Entkuppelsensor

58

motor housing

60

electric motor

61

Engine / gear

62

worm gear

64

Engine output shaft

66

first sprocket (gear wheel)

68

power unit

70

control device

72

coupling pin

74

cam

76

coupling claw

80

output shaft

82

camp

84

shaft coupling

86

connector

88

head Start

90

longitudinal groove

92

second chain pinion

94

traction drives

96

drive chain

100

transmission device

102

gearmotor

104

Rotation detector

105

rotation sensor

106

Motor gear case portion

108

Electric motor housing portion

110

transmission cover

112

connection

120

Engine Transmission temperature monitoring device

122

slug

124

motor gear

126

temperature sensor

128

circuit board

130

Plastic insert

132

Pin flags (motor connections)

134

Plastic insert

136

metal pin

138

Hall sensor

140

Hall sensor

Claims (9)

1. Door drive (14) for driving a door (10), comprising:

   an electric motor unit (50), a transmission device (100) for transmitting driving power from the electric motor unit (50) to a door element (10) to be driven, wherein said electric motor unit (50) is constructed as a gear motor (102) including an electric motor (60) and a motor gear (61), a motor gear temperature monitoring device (120) for monitoring a temperature of the motor gear (61), and a control device (70) connected to the motor gear temperature detection device (120) for controlling the electric motor (60) dependent on the temperature of the motor gear (61) detected by said motor gear temperature detection device (120), characterized in that the motor gear (61) is self-locking and includes a plastic wheel (124) and wherein the control device (70) is configured in such a manner that

   a) it limits the motor power of the electric motor (60) when the motor gear temperature exceeds a predetermined threshold temperature and/or

   b) prevents operation of the electric motor (60) when the motor gear temperature exceeds a predetermined cut-off temperature.
2. Door drive (14) according to claim 1,
   characterized in that the motor gear (61) is a worm gear (62) and that a motor gear wheel (124) made of plastic is arranged on an output shaft of the electric motor unit (50) and meshes with a worm gear wheel (122).
3. Door drive (14) according to one of the preceding claims,
   characterized in that the electric motor unit (50) has a motor housing (58) with a motor gear housing part (106) accommodating said motor gear (61), and an electric motor housing part (108) accommodating said electric motor (60), said motor gear temperature monitoring device (120) including a temperature sensor (126) accommodated within said motor gear housing part (106), for detecting a temperature inside said motor gear housing part (106).
4. Door drive (14) according to one of the preceding claims,
   characterized in that the motor gear (16) has an associated rotation detection device (104) for detecting rotation of the motor gear (61) and including a rotation sensor (105) for detecting rotation at least of an element (122, 124) of the motor gear (61), and that said rotation sensor (105) and a temperature sensor (127) of the motor gear temperature detection device (120) are disposed on a common printed circuit board (128).
5. Door drive (14) according to one of the preceding claims,
   characterized in that the door drive (14) is constructed as a shaft door drive for directly rotationally driving a door shaft (12) of the door (10).
6. Door drive (14) according to claim 5,
   characterized in that the door drive (14) being a shaft door drive is constructed in such a manner that the gear device (100) includes a traction mechanism (94), the input shaft thereof is coupled to a motor output shaft (64) of the motor gear (61) and the output shaft (80) thereof can be coupled to the door shaft (12).
7. Method of controlling a door drive (14) for driving a door (10), wherein said door drive (14) is provided with an electric motor unit (50) and a gear device (100) for transmitting driving power from the electric motor unit (50) to an element (12) of the door (10) to be driven, wherein the electric motor unit (50) is constructed as a gear motor (102) having an electric motor (60) and a self-locking motor gear (61) including a plastic wheel (124), wherein said control method comprises the steps of:

   detecting a motor gear temperature at the motor gear (61) and controlling the electric motor (60) dependent on the detected motor gear temperature, wherein the control method at least comprises one of the steps of:

   a) limiting a motor power of the electric motor (60) when the motor gear temperature exceeds a predetermined threshold temperature and/or

   b) preventing operation of the electric motor (60) when the motor gear temperature exceeds a predetermined cut-off temperature.
8. Control method according to claim 9,
   characterized in that the temperature of a worm gear (62) of the electric motor unit (50) is monitored by means of a motor gear wheel (124) made of plastic that is arranged on an output shaft of the electric motor unit (50) and meshes with a worm wheel (122).
9. Control method according to one of the claims 7 or 8,
   characterized by outputting an alarm in case the motor gear temperature exceeds a predetermined threshold temperature, and/or an explanatory message in case of any influence on the progression of a door movement when the threshold temperature is exceeded.

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