Patent Publication Number: US-2022216732-A1

Title: Door operator system

Description:
TECHNOLOGY FIELD 
     The present invention relates to a door operator system for opening and closing an opening. 
     BACKGROUND 
     A door operator system for an overhead door typically comprises a door connected to a door frame and a drive unit arranged to move the door along the door frame between an open and closed position for opening and closing the opening. The door, which may be a sectional door, is typically used as a garage doors or as an industrial door. The drive unit can further comprise a motor or a mechanical unit such as a spring to move the door. 
     To achieve a more efficient door operator system that reduces the complexity and the risks of the door operator system during operation, maintenance and installation a door operator system with drive units mounted to the door has been developed. Such a door addresses several shortcomings and disadvantages with conventional door operator systems by introducing a drive modularity, allows for easier and faster installation and a reduced complexity. 
     However, such a solution requires power transmission between the drive units mounted to the door panel and a power source typically arranged on a door frame or a wall adjacent to the door. This may lead to complex power transferring systems with large numbers of cables extending between the door and the door frame or contact interfaces in the form of hardware connectors or contact pins between the door blade and external power transfer devices which are highly susceptible to environmental impact in the form of rain, snow, dirt etc. 
     SUMMARY 
     An object of the present disclosure is to provide a door operator system which seeks to mitigate, alleviate, or eliminate one or more of the above-identified deficiencies in the art and disadvantages singly or in any combination. 
     An object of the present invention is to reduce the complexity of the door operator system. 
     An object of the present invention is to obtain a door operator system that is less sensitive to structural damage to the mechanical parts of the door system. 
     In this disclosure, a solution to the problem outlined above is proposed. In the proposed solution, a door operator system for opening and closing an opening is described. 
     In a first aspect, a door operator system for opening and closing an opening is provided. The door frame comprises a first frame section at a first side of the opening and a second frame section at a second side of the opening. 
     The door operator system further comprises a door arranged to be moved between an open and closed position, the door being connected to the door frame. Also, the door operator system comprises a drive unit mounted on the door, whereby the drive unit is moveably connected to first frame section and the drive unit is moveably connected to the second frame section. The drive unit comprises at least one motor connected to at least one energy storage device arranged to power the at least one motor, the drive unit being arranged to move the door from the closed position to the open position. 
     The door operator system further comprises an energy transmitting device disposed in close proximity to the door and an energy receiving device mounted on the door. The energy transmitting device is configured to wirelessly transmit energy to the energy receiving device mounted to the door, whereby the energy receiving device is operatively connected to the at least one energy storage device for charging said energy storage device. 
     Embodiments of the invention are defined by the appended dependent claims and are further explained in the detailed description section as well as in the drawings. 
     It should be emphasized that the term “comprises/comprising” when used in this specification is taken to specify the presence of stated features, integers, steps, or components, but does not preclude the presence or addition of one or more other features, integers, steps, components, or groups thereof. All terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to “a/an/the [element, device, component, means, step, etc.]” are to be interpreted openly as referring to at least one instance of the element, device, component, means, step, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated. 
     A reference to an entity being “designed for” doing something in this document is intended to mean the same as the entity being “configured for”, or “intentionally adapted for” doing this very something. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The foregoing will be apparent from the following more particular description of the example embodiments, as illustrated in the accompanying drawings in which like reference characters refer to the same parts throughout the different views. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating the example embodiments. 
         FIG. 1  is a schematic perspective view of a door operator system comprising a door in a closed position. 
         FIG. 2 a    is a schematic side view of a door operator system comprising a door in an open position. 
         FIG. 2 b    is a schematic side view of a door operator system comprising a door in an intermediate position. 
         FIG. 2 c    is a schematic side view of a door operator system comprising a door in a closed position. 
         FIG. 3  is a schematic view of a section of a door and a drive unit generally according to an embodiment. 
         FIG. 4  is a schematic view of a part of the section of a door and the drive unit shown in  FIG. 3 . 
         FIG. 5  is a schematic view of the connection between the door frame and the drive unit according to an embodiment. 
         FIG. 6  is a schematic view of a part of the door frame generally according to an embodiment. 
         FIG. 7  is a schematic view of a part of the door frame generally according to an embodiment. 
         FIG. 8  is a schematic view the connection between the door frame and the drive unit generally according to an embodiment. 
         FIG. 9  is a schematic view of a drive unit comprising a spline joint in a compressed position. 
         FIG. 10  is a schematic view of a drive unit comprising a spline joint in an extended position. 
         FIG. 11  is a schematic perspective view of a door operator system comprising a door in a closed position. 
         FIG. 12 a    is a schematic perspective view of a door operator system according to an embodiment, the door operator system comprising a door in a closed position. 
         FIG. 12 b    is a schematic perspective view of a door operator system according to an embodiment, the door operator system comprising a door in a closed position. 
         FIG. 13 a    is a schematic perspective view of a door operator system according to an embodiment, the door operator system comprising a door in a closed position. 
         FIG. 13 b    is a schematic perspective view of a door operator system according to an embodiment, the door operator system comprising a door in a closed position. 
         FIG. 13 c    is a schematic perspective view of a door operator system according to an embodiment, the door operator system comprising a door in an open position. 
         FIG. 13 d    is a schematic perspective view of a door operator system according to an embodiment, the door operator system comprising a door in an open position. 
     
    
    
     DETAILED DESCRIPTION 
     Embodiments of the invention will now be described with reference to the accompanying drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. The terminology used in the detailed description of the particular embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, like numbers refer to like elements. 
       FIGS. 1-4 and 11-13  all illustrates a sectional door operator system. However, as should be understood by a person skilled in the art, the inventive aspects of the present invention are also applicable to a door operator system that is a single blade door operator system. 
       FIGS. 1-2  are schematic views of a door operator system  1  in which the inventive aspects of the present invention may be applied. The door operator system comprises a door frame  3 , a drive unit  10  and a door  8 . The door operator system  1  is arranged to be installed in an opening  2  defined by a wall  50  and a floor  23 . The door  8  is connected to the door frame  3 . The door operator system  1  is arranged to open and close the opening  2  by moving the door  8  between an open position O, as disclosed in  FIG. 2   a,  and a closed position C, as disclosed in  FIGS. 1 and 2   c.    
     In this embodiment, the door  8  is a sectional door  8  comprising a plurality of horizontal and interconnected sections  9   a - e  connected to the door frame  3 . In one embodiment, the door is a garage door. In an alternative embodiment, the door is an industrial door. The door  8  is arranged to be moved along the door frame  3  between the closed position C and the open position O. 
     The door operator system  1  further comprises at least one energy transmitting device  13 ,  14  which is disposed in close proximity to the door  8 . As shown in  FIG. 1 , the door operator system  1  may comprise a first energy transmitting device  13  and a second energy transmitting device  14 . The at least one energy transmitting device  13 ,  14  is configured to wirelessly transmit energy to energy receiving device (not shown in  FIG. 1 ) mounted on the door  8 . 
     In one embodiment, at least one energy transmitting device is disposed in close proximity to the vertical edge of the door  8 . The at least one energy transmitting device may further be arranged to be disposed in close proximity to the vertical edge of the door  8  when the door  8  is in the closed position, open position and/or the between the open and closed position. 
     In one embodiment, the door operator system is an up and over door operator system. A up and over door operator system is a system in which the door in the closed position C is arranged substantially vertical and in the open position O is arranged substantially horizontal and inside of the opening. 
     In an alternative embodiment, the door operator system is an up and up door operator system. A up and up door operator system is a system in which the door in the closed position C is arranged substantially vertical and in the open position O is arranged substantially vertical above the opening. 
     In a further alternative embodiment, the door operator system may be a door operator system in which the door in the closed position C is arranged substantially vertical and in the open position O is arranged in an inclined position disposed between a substantially vertical and a substantially horizontal position. For example, the door may be arranged at a 45 degrees angle from a horizontal position in the open position O, as the skilled person recognizes however the door may be arranged at any angle disposed between the horizontal and vertical orientation of the door in the open position O. 
     The door frame  3  comprise a first frame section  4  at a first side  5  of the opening  2  and a second frame section  6  at a second side  7  of the opening  2 . The door frame  3  is connected to the wall  50  and to the floor  23 . In one embodiment, the first frame section  4  comprises a substantially vertical part  4   a  and a substantially horizontal part  4   b.  The second frame section  6  comprises a substantially vertical part  6   a  and a substantially horizontal part  6   b.  The vertical part  4   a,    6   a  and the horizontal part  4   b,    6   b  are connected to create a path for the door  8  to glide on and a track for the drive unit  10  to interact with. In one embodiment, wherein the door operator system is an up and up door operator system the first and second frame section are vertical. 
     Referencing  FIG. 2 a   - c,  in one embodiment the door frame  3  further comprise a first track unit  31  moveably connected to the first frame section  4 , and a second track unit  32  moveably connected to the second frame section  6 . The door  8  is connected to the first track unit  31  at said first side  5  and to the second track unit at said second side  7 . In one embodiment, the first track unit  31  is moveably connected to the vertical part  4   a  of the first frame section  4  and the second track unit  32  is moveably connected to the vertical part  6   a  of the second frame section  6 . 
     In one embodiment, the first and the second track unit  31 ,  32  are adapted to be angled in relation to the first and second frame sections  4 ,  6 . In one embodiment, the first and the second track unit  31 ,  32  is adapted to be angled in relation to the vertical part  4   a,    6   a  of the first and second frame sections  4 ,  6 . The door  8  is moveable between the closed position C, as disclosed in  FIG. 2 b   , an intermediate position I and the open position O. 
     In one embodiment, the first and the second track unit  31 ,  32  are adapted to be arranged in a first position in which the door  8  is in the closed position C and in a second position in which the door  8  is moveable between the intermediate position I and the open position O. The horizontal part  4   b,    6   b  of the door frame  3  are in the second position connected to the first and second track unit  31 ,  32  to create a path for the door  8  to glide on and a track for the drive unit  10  to interact with the door frame  3 . In the second position the door  8  is moveable along the door frame  3  and glides in the first and second track units  31 ,  32  and the first and second frame section  4 ,  6 . In the second position, the first and second track units  31 ,  32  are connected to the parts of the first and second frame sections  4 ,  6  at which the door  8  is positioned in the opened position O. In the second position the first track unit  31  is connected with the horizontal part  4   b  of the first frame section  4  and the second track unit  32  is connected with the horizontal part  6   b  of the second frame section  6  to achieve a path for the door  8  to be moved along and the drive unit  10  to interact with. 
     In one embodiment, the door  8  is at a first side  5  moveably connected to the first track unit  31  and at a second side  7  moveably connected to the second track unit  32 . 
     In one embodiment, the drive unit  10  is adapted to interact with the first and the second track unit  31 ,  32  to move the door  8  from the intermediate position Ito the closed position C. 
     In one embodiment, the first and second track unit  31 ,  32  is adapted to interact with the door  8  to move the door  8  from the closed position C to the intermediate position I. In one embodiment the door  8  is moved by gravity from the closed position C to the intermediate position I. 
     In one embodiment, the first and the second track unit  31 ,  32  is angled in relation to the vertical parts of the first and second frame sections  4 ,  6  when moving the door  8  between the intermediate position I and the closed position C. 
     In one embodiment, the drive unit  10  moves the first and second track unit  31 ,  32  upwards to move the door  8  between the intermediate position I and the closed position C. 
     In one embodiment, the drive unit  10  and first and second track unit  31 ,  32  moves the door  8  towards the first and second frame section  4 ,  6  when moving the door  8  between the intermediate position I and the closed position C. 
     In one embodiment, the drive unit  10  and the first and second track unit  31 ,  32  press the door  8  towards the first and second frame section  4 ,  6  when the door  8  is in the closed position C. 
     In one embodiment, the first and second track units  31 ,  32  is in the first position arranged substantially parallel to the vertical parts  4   a,    6   a  of the first and second frame sections  4 ,  6 . In one embodiment, the first and second track units  31 ,  32  is in the second position at an angle in view of the first and second frame sections  4 ,  6 . 
     In one embodiment, the door frame  3  comprises at least two arms  40  as disclosed in  FIGS. 5 and 6 . One arm  40  is in a first end rotatable connected to the first frame section  4  and in an second end is rotatable connected to the first track unit  31  and one arm  40  in a first end is rotatable connected to the second frame section  6  and in an second end is rotatable connected to the second track unit  32 . The at least two arms  40  are arranged to guide the first and the second track units  31 ,  32  when they are moved from the first position to the second position. 
     In one embodiment, the door  8  is at a first side  5  moveably connected to the first track unit  31  and at a second side  7  moveably connected to the second track unit  32 . 
     In one embodiment, the first and second track unit  31 ,  32  comprise the guide track  16  in accordance with above. The guide track  16  is arranged to interact with the at least first respectively second wheel  17  of the drive unit  10 . 
     In one embodiment, the door  8  is at a first side moveably connected to the first track unit  31  and at a second side moveably connected to the second track unit  32 . In one embodiment one or more of the plurality of sections is connected to the first track unit  31  at said first side  5  and to the second track unit  32  at said second side  7 . 
     Referencing  FIGS. 1 and 2   a - c,  the door  8  is directly or indirectly connected to the door frame  3 . The door  8  is at a first side moveably connected to the first frame section  4  and at a second side moveably connected to the second frame section  6 . In one embodiment, one or more of the plurality of sections  9   a - e  is connected to the first frame section  4  at said first side  5  and to the second frame section  6  at said second side  7 . 
     With reference to  FIG. 3-4 , the drive unit  10  is mounted on the door  8 . The drive unit  10  is moveably connected to the first and second frame section. Accordingly, drive unit  10  is connected so as to allow for relative movement between the door and the frame, whereby the drive unit is fix to the door. The drive unit  10  comprises at least one motor  11 . The drive unit  10  is arranged to move the door  8  from the closed position to the open position. To provide power to the motor  11 , the at least one motor  11  is connected to at least one energy storage device  12  arranged to power the at least one motor  11 . The drive unit  10  is arranged to move the door  8  from the closed position C to the open position O. 
     In one embodiment, the drive unit  10  is arranged to move the door from the open position O to the closed position C. In one embodiment, the door  8  is arranged to move from the open position O to the closed position C by means of the weight of the door  8 . In one embodiment, the drive unit  10  is arranged to brake the door  8  when moving from the open position O to the closed position C. Further referencing  FIG. 3-4 , the drive unit  10  is further connected to the door frame  3 . 
     The drive unit  10  is at a first side moveably connected to the first frame section  4  and at a second side moveably connected to the second frame section  6 . The first and second motor may be arranged on the same horizontal section of the door  8 . The first and second motor may be arranged on the bottommost horizontal section  9   e  of the door  8 . 
     In one embodiment, the drive unit  10  at least comprises a first motor  11   a  and a second motor  11   b.  The first motor  11   a  and the second motor  11   b  may be mounted at different vertical sides of the door  8 . 
     In one embodiment, the drive unit  10  at least comprises a first motor  11   a  and a second motor  11   b,  the first motor  11   a  and the second motor  11   b  may be mounted at the same vertical sides of the door  8 . The first and second motor may be arranged on the same horizontal section of the door  8 . The first and second motor may be arranged on the bottommost horizontal section  9   e  of the door  8 . 
     In one embodiment, the first motor  11   a  is moveably connected to the first frame section  4  and the second motor  11   b  is moveably connected to the second frame section  6 . The drive unit  10  is arranged to interact with the door frame  3  to move the sectional door  8  from the closed position C to the open position O and from the open position O to the closed position C. 
     As depicted in  FIG. 3-4 , the motors  11  and the drive unit  10  are preferably arranged on the same main phase of the door  8 , e.g. an outer or inner phase of the door  8 . To protect the motors  11  and drive unit  10 , said motors and drive unit are arranged on an inner phase of the door in the form of an interior facing door phase of the door  8 . 
     In one embodiment, the drive unit  10  comprises a single motor  11 . The motor  11  is connected to both the first frame section  4  and the second frame section  6 . In one embodiment, the drive unit  10  may further comprise a shaft driven by said motor  11 , the shaft connecting the motor  11  to said first and second frame section. 
     In one embodiment, the motor(s)  11  of the drive unit  10  is a direct current DC motor  11 . In a preferred embodiment, the motor(s)  11  is a brushless direct current (BLDC) motor(s). 
     In one embodiment, the drive unit  10  comprise at least a first and second pinion  18 , wherein the first pinion  18  is connected to the first motor  11   a  and the second pinion  18  is connected to the second motor  11   b.  The pinions  18  are rotated by the motors  11  when the motors  11  are running. The pinions  18  rotates the motors  11  when the weight of the door  8  moves the door  8 . 
     In one embodiment, the drive unit  10  comprise at least a first and a second wheel  17 . In one embodiment, the wheels  17  are connected to the motors  11   a,    11   b.  In an alternative embodiment, the wheels  17  are connected to the pinions  18  of the drive unit  10 . The wheels  17  may be arranged to be rotated by the motors  11 . 
     As disclosed in  FIGS. 5, 6, 7 and 8 , the door frame  3  may comprise a rack  19 . In one embodiment, the first and the second frame sections  4 ,  6  of the door frame comprise the rack  19 . The rack  19  of the door frame  3  is arranged to interact with said at least first and second pinion  18  of the drive unit  3  to move the door  8 . The connection between the drive unit  10  and the door frame  3  is not restricted to a rack and pinion  18  connection and could be achieved by means of one or more of a belt drive, a magnetic drive, chain drive or a friction drive. Both the first and the second frame section  4 ,  6  accordingly comprises the rack  18 . 
     In one embodiment, as disclosed in  FIG. 7 , the door frame  3  comprises a guide track  16 . In one embodiment, the guide track  16  is connected to the first and second frame section  4 ,  6 . In an alternative embodiment, the guide track  16  is an integrated part of the first and second frame section  4 ,  6 . 
     In one embodiment, the energy transmitting device is arranged in or integrated into the first and/or second track unit  31 ,  32  previously described with reference to  FIG. 2 a   - c.    
     The wheels  17  are adapted to be inserted into the guide track  16 . The wheels  17  are arranged to interact with the guide track  16  and to restrict horizontal movement of the wheels  17  when the wheels  17 , and thus also the drive unit  10  and the door  8 , is moved between the open and closed position O, C of the door  8 . 
     In one embodiment, as disclosed in  FIGS. 9 and 10 , the drive unit  10  comprise at least a first and a second spline joint  15 . The first spline joint  15  is in one end connected to the first wheel  17  and in a second end connected to the first motor  11 . The second spline joint  15  is in one end connected to the second wheel  17  and in a second end connected to the second motor  11 . As the guide track  16  is arranged to restrict horizontal movement of the wheels  17  and the wheels are connected to the motors  11 , the spline joints  15  will move and compensate for any horizontal movement of the drive unit  10  and the door  8  in relation to the door frame  3 . The spline joints  15  will be compressed when the distance between the motors  11  and the door frame  3  decreases. The spline joints  15  will be extracted when the distance between the motors  11  and the door frame increases, as disclosed in  FIG. 10 . 
     In one embodiment, the spline joints  15  are arranged to compensate for horizontal movements of the first and second motor  11  in relation to the first and second frame section  4 ,  6 , respectively. In one embodiment, the wheels  17  are connected to the spline joints  15  of the drive unit  10 . 
     The spline joint arrangement is particularly advantageous in combination with the wireless energy transfer which will be described in further detail later on. This is due to the spline joint allowing a stable movement and a precise alignment between the door and the frame. Hence, a more efficient energy transfer is obtained due to the energy transmitting device(s) and energy receiving device(s) more reliably aligning. 
     In one embodiment, the drive unit  10  comprise one or more sensors (not shown) arranged to identify a person or object in the path of the door  8  and to interrupt or reverse the movement of the door  8  when identifying the person or object. The one or more sensors may be one or more of a pressure sensor, an IR-sensor, a camera, a radar or a presence sensor. 
     A control unit may be in operative communication with the drive unit  10 . The control unit may be in wired communication with the two motors  11   a,    11   b  or be in a wireless communication. 
     The control unit is configured to control the movement of the drive unit  10 , i.e. when and how the drive unit  10 , and its associated motors  11   a,    11   b,  should move the door  8 . The control unit is arranged to receive input of if the door  8  should be opened or closed. In one embodiment, the control unit is arranged to receive the input from one or more of a user interface, a mechanical button or a remote control. 
     As depicted in  FIG. 11 , the drive unit  10  may comprise at least the first and the second motor  11  mounted on the first section  9   e  of the door  8 . The first motor  11  is moveably connected to the first frame section  4  and the second motor  11  is moveably connected to the second frame section  6 . In accordance with the aforementioned, the drive unit may further comprise additional motors which will now be described further. 
     In one embodiment schematically depicted in  FIG. 12   a,  the drive unit  10  comprise a third and a fourth motor  11   c - d  mounted on a second horizontal section  9  of the horizontal sections and arranged to assist the first and second motors  11   a - b  when moving the sectional door  8  from the closed position C to the open position O. The third and fourth motors  11  are connected to the control unit  20  and arranged to be controlled by the control unit in the same way as described above in relation to the first and second motor  11 . In one embodiment, the system  1  comprises four motors  11   a - d  and one control unit  20 . The first and second motor  11   a,    11   b  are arranged on one section  9   e  and the third and fourth motor  11   c,    11   d  are arranged on another section  9   c.    
     In one embodiment, the first and second motor  11   a,    11   b  are arranged on a section  9   e  that is located on the section  9  of the door being closest to the floor  23  in the closed position C. However, it should be noted that the section  9   e  could for example also be the section  9   d  which is the section being arranged next to the section being closest to the floor  23  in the closed position C. 
     In one embodiment schematically depicted in  FIG. 12 b   , the drive unit  10  comprise a fifth and a sixth motor  11   e - f  mounted on a third horizontal section  9  of the horizontal sections  9  and arranged to assist the other motors  11  when moving the sectional door  8  from the closed position C to the open position O. The fifth and sixth motors  11   e - f  are connected to the control unit  20  and arranged to be controlled by the control unit in the same way as described above in relation to the first and second motor  11   a - b.  In one embodiment, the system  1  comprises six motors  11   a - f  and one control unit. The first and second motor  11   a,    11   b  are arranged on one section  9   e,  the third and fourth motor  11   c,    11   d  are arranged on another section  9   c,  and the fifth and sixth motor  11   e,    11   f  are arranged on another section  9   d.    
     In the embodiments where additional sections  9   a - e  are arranged with motors, these may be arranged on every other section, every section or at one section being arranged above the section  9   e.    
     In one embodiment the first, second, third or the first, second, third and fourth motor may be arranged on a section  9 . Preferably, said motors may be arranged on the bottommost section  9   e.    
     Turning to  FIGS. 13 a   - d,  an energy receiving device  81  is mounted on the door  8 . The energy transmitting device  13 ,  14  is configured to wirelessly transmit energy to the energy receiving device  81  mounted to said door  8 . To allow for energy transfer between the door  8  and the energy transmitting device  13 ,  14 , the energy receiving device  81  is operatively connected to the at least one energy storage device  12  for charging said energy storage device  12 . 
     Hence, power is transmitted wirelessly between an external power source  96  to the drive units  10  mounted on the door  8 . By means of the energy storage device  12  the motor is provided with enough power for moving the door  8 . Thus, the energy transmitting device is configured to transmit energy to the energy receiving device  81  from an external power source  96 . 
     Thereby a door operator system which enables driving of the door without hardware contact interfaces in the form of mechanical terminals. Compared to mechanical terminals which connects the energy transmitting device to the energy receiving device, the wireless connection is significantly less susceptible to contacting issues between said devices due to dirt, snow and corrosion. Accordingly, a door operator system which is more reliable is achieved. 
     Further, the wireless power transfer for driving the drive unit reduces the need for cables or wires extending between the door and components positioned next to the door, e.g. mounted to the frame or the wall. This reduces the complexity of the door operator system and the cost for assembling, installation and manufacturing of said door operator system. In addition, the reduced amount of moving parts in the system further increases the reliability of the door operator system. 
     Accordingly, the first energy transmitting device  13  and the second energy transmitting device  14  are configured to be connected to the external power source  96 . The first and second energy transmitting device may be connected to a common power source or separate power sources. Phrased differently, the energy transmitting device(s) are arranged to wirelessly transmit, e.g. electrical energy, from the external power source to the energy receiving device  81  mounted to the door  8 . 
     In one embodiment, the energy transmitting device  13 ,  14 , e.g. any one of the energy transmitting device is mounted to the door frame. To simplify the design and construction of the door operator system both the energy transmitting devices  13 ,  14  may be mounted on the same side of the door opening  2 . The energy transmitting devices  13 ,  14  may thus be mounted to the same frame section. 
     In one embodiment, the energy transmitting device(s) may be disposed adjacent to the vertical edge of the door  8 , whereby the energy receiving device(s) are disposed on the door  8  close to the vertical edge of the door  8 . The power transfer is thus made more reliable due to the small distance between the energy receiving and energy transmitting devices. 
     In one embodiment, the energy transmitting device(s) may be integrated into the door frame. The integration of the energy transmitting device(s) allows for easier installation and mounting of the door operator system and also provides logistical benefits due to simplifying the transportation of the components of the door operator system. For example, the energy transmitting device(s) may be disposed inside the guide track  16  so as to be at least partially covered by the walls of said guide track  16  or any of the frame sections so as to be at least partially covered by the walls of said frame section. The energy transmitting device is thus more protected against outside tampering and exposure to structural damage. Also, the energy transmitting device is concealed, whereby a more aesthetic door operator system is achieved. 
       FIGS. 13 a - b    discloses the door  8  of the door operator system  1  in the closed position C. The first energy transmitting device  13  is arranged to transfer energy to the energy receiving device  81  when the door  8  is in the closed position C. The first energy transmitting device  13  may thus be arranged to be aligned with the energy receiving device  81  when the door  8  is in the closed position. The first energy transmitting device  13  is disposed in close proximity to the door  8  so as to enable energy transfer between the energy receiving device  81  and the first energy transmitting device  13 . Referencing said  FIGS. 13 a   - b,  the door  8  is moved to the closed position C whereby said energy receiving device  81  is aligned with the first energy transmitting device  13  and energy is transferred to the energy storage device  12  for charging the energy storage device  12 . The drive unit  10  may thus be charged and provided with sufficient energy while being in the closed position C to enable a subsequent opening of the door  8 . As a result, the door operator system may be optimised to be more energy-efficient, further the mounting of the energy transmitting device is easier to perform for the service and mounting personnel due to the closed position being a well-defined end position of the door. 
       FIGS. 13 c - d    discloses the door  8  of the door operator system  1  in the open position O. The second energy transmitting device  14  is arranged to transfer energy to the energy receiving device  81  when the door  8  is in the open position O. The second energy transmitting device  14  may accordingly be arranged to be aligned with the energy receiving device  81  when the door  8  is in the closed position C. The second energy transmitting device  14  is disposed in close proximity to the door  8  so as to enable energy transfer between the energy receiving device  81  and the second energy transmitting device  14 . Referencing said  FIGS. 13 c   - d,  the door  8  is moved to the open position O whereby said energy receiving device  81  is aligned with the second energy transmitting device  14  and energy is transferred to the energy storage device  12  for charging the energy storage device  12 . Corresponding to the above example with the charging being performed in the closed position C of the door  8 , the drive unit  10  may be charged and provided with sufficient energy while being in the open position O to enable a subsequent closing of the door  8 , by means of selectively brake and drive the door  8 . As a result, the door operator system may be optimised to be more energy-efficient, further the mounting of the energy transmitting device is easier to perform for the service and mounting personnel due to the open position being a well-defined end position of the door. 
     As depicted in  FIGS. 13 a   - d,  the same energy receiving device  81  may come into energy transmitting connection with both the first energy transmitting device  13  and the second energy transmitting device  14 . Hence, the energy receiving device  81  may, due to it being mounted to the door  8 , move between a position wherein it is aligned with the first energy transmitting device  13  when the door  8  is in the closed position C and a position wherein it is aligned with the second energy transmitting device  14  when the door is in the open position O. By only utilising a single energy receiving device for energy transfer from the first and second energy transmitting device, the complexity of the door operator system is reduced and less cables has to be utilised on the door. 
     In one embodiment, the door operator system may comprise a plurality of energy receiving devices  81  each of which may be disposed to align with any number of energy transmitting devices  13 ,  14 . 
     Notably, the energy transmitting device(s) and energy receiving device(s) are configured to enable energy transfer between them upon alignment. In one embodiment, the energy transmitting device(s) and energy receiving device(s) may thus be paired independently as the energy receiving device(s) moves corresponding to the movement of the door  8 . 
     In one embodiment, one energy transmitting device  84  which may be a third energy transmitting device  84  may be arranged to transfer energy to the energy receiving device  81  when the door is in an intermediate position between the closed position C and the open position. Accordingly, the energy transmitting device  84  may be arranged to transfer energy to the energy receiving device  81  when the door  8  is kept at an intermediate position. The intermediate position is a position disposed along the movement trajectory of the door between the closed position and open position. The intermediate position may correspond to a predefined intermediate position such as a ventilating position or a partially open positon of the door  8 . 
     In one embodiment, the energy transmitting device(s) may comprise a transmitting activation switch and a sensing element. The sensing element is configured to detect when the energy receiving device is in within a distance allowing for energy transfer, whereby said switch is configured to in response to the sensing element detecting the energy receiving device being within the distance allowing for energy transfer activate the energy transmitting device to allow for energy transmission between the energy transmission device and the energy receiving device. 
     In one embodiment, the energy receiving device(s) may comprise a receiving activation switch and a sensing element. The sensing element is configured to detect when the energy transmitting device is in within a distance allowing for energy transfer, whereby said switch is configured to in response to the sensing element detecting the energy transmitting device being within the distance allowing for energy transfer activate the energy receiving device to allow for energy transmission between the energy transmitting device and the energy receiving device. 
     In one embodiment, the energy receiving device(s) and/or energy transmitting device(s) may be operatively connected to an energy transmission controller, the energy transmission controller may be comprised in the energy transmitting device, the energy receiving device or the control unit Said energy transmission controller may be configured to control the effect of the energy transmitting device. In one embodiment, said energy transmission controller may be configured to control the effect, e.g. the effect of the induction signal emitted from the energy transferring device, of the energy transmitting device based on the distance between the energy transmitting device and the corresponding energy receiving device. 
     By means of the selective activation of the energy transfer, the energy receiving device and/or the energy transmitting device does not have to be in an active mode until said devices are close enough to each other to allow for energy transfer. Hence, the selective activation of the energy transfer upon alignment of the energy receiving device and energy transmitting device enable a reduction of the overall energy consumption of the door operator system. 
     As previously described, the door operator system may further comprise the control unit  20 . The control unit  20  is in operative communication with the drive unit  10  and configured to control the operation of the drive unit  10 . Further, the control unit  20  may be configured to control the movement of the drive unit  10 , i.e. when and how the drive unit  10 , and its associated motors, should move the door  8 . The control unit  20  is arranged to receive input of if the door  8  should be opened or closed. In one embodiment, the control unit  20  is arranged to receive the input from one or more of a user interface, a mechanical button or a remote control. As will be described more with reference to  FIG. 13 a   - d,  the control unit  20  is configured to control the operation of the at least first and second motors  11   a,    11   b  or the single motor  11 . In a preferred embodiment, the control unit  20  is configured to control and adjust the operating speed of one or all of the motors in response to position data. 
     As schematically depicted in  FIGS. 13 a  and 13 c   , the control unit  20  may be mounted to the door  8  and may be connected to the energy storage device  12  for receiving energy from said energy storage device  12 . The control unit  20  may be connected to the energy storage device  12  for powering said control unit  20 . The control unit  20  may be connected to the energy storage device  12  by means of a wired connection. 
     Hence, the components associated with the movement of the door may all be disposed on the door which may completely remove any need for wires and cables extending between the surroundings and the door. 
     In one embodiment, at least one additional energy consuming device  89  may be arranged on the door  8 . Said energy consuming device  89  may be connected to the drive unit, e.g. the energy storage device  12  of the drive unit  10 , for receiving energy therefrom. The energy consuming device  89  may for example be a display, light source or sensor such as a wireless sensor. Said energy consuming device may be operatively connected to the control unit  20 , whereby the control unit  20  is further configured to control said energy consuming device. 
     In one embodiment, the door operator system further comprises an operator panel  21  for sending operator input to the control unit  20  of the drive unit  10 . The operator panel  21  may comprise a user interface for manual control of the door  8 . The operator panel  21  may comprise a set of buttons or a touch screen for allowing said control of the door  8 . The operator panel  21  may be mounted externally from the door  8 . As depicted in  FIGS. 13 a  and 13 c    the operator panel  21  may be configured to wirelessly communicate with the control unit  20  arranged on the door  8   
     As schematically depicted in  FIGS. 13 b    and  13   d,  the control unit  20  is mounted externally from the door  8  and is configured to communicate wirelessly with the drive unit  10 , e.g. mounted away from the door  8 . Hence the drive unit  10  may further comprise a communication interface connected to the energy storage device  12  for receiving energy from said energy storage device  12 . The communication interface is operatively connected to the at least one motor  11  of the drive unit  10  and is further configured to receive control signals wirelessly from the control unit  20  and transfer said control signals to the at least one motor  11  for controlling said motor  11 . Hence, no cables or wires are required for transferring control input to the drive unit, e.g. the at least one motor of the drive unit. Further referencing said  FIGS. 13 b    and  13   d,  the operator panel  21  may be connected to the control unit  20  by means of a wired connection. In one embodiment, the operator panel  21  may be integrated into the control unit  20 . 
     The energy storage device  12  may be any conventional and suitable energy storage device  12  known to the skilled person. The energy storage device  12  is configured to receive energy from the energy receiving device  81  and store said energy. Further, the energy storage device  12  is configured to release said energy to operate the at least one motor of the drive unit  10 . 
     In one embodiment, the energy storage device  12  is a battery, whereby the energy receiving device  81  is connected to the battery  12  via a battery charger  82  mounted to the door  8 , the battery charger  82  being configured to charge said battery  8 . The energy receiving device  81  is connected to the battery charger  82  and the battery  8  by means of a wired connection. The voltage of the battery is preferably relatively low. In one embodiment, the voltage of the battery may be between 12 V and 60 V. Preferably, the voltage of the battery may be 36 V or 24 V or 48 V. If the voltage is lower than 42.2 V, the electrical system of the door may be classified as a Safe Extra Low Voltage (SELV) system. This relieves the design from many costly and complicated design issues, and simplifies the certification and approval process to a great extent. To achieve this classification, the power supply from the mains must have an electrical insulation between the primary and secondary side equivalent to double insulation or reinforced insulation (according to EN 60 335-1). Hence, in one embodiment, the voltage of the battery may not exceed 42.2 V. 
     In one embodiment, control unit  20  is operatively connected to the battery charger  82  and further configured to control said battery charger  82  for controlling the charging of the battery  12 . 
     In one embodiment, the energy storage device  12  may be a capacitor, such as a super capacitator. The capacitor is mounted to the door  8  and connected to the drive unit  10 , e.g. the at least one motor  11  of the drive unit  10 . 
     In one embodiment, wherein the energy transmitting device  13 ,  14  and the energy receiving device  81  are arranged to be in an energy transferring relation, e.g. aligned, without coming into contact, e.g. physical contact. Thus, the energy transmitting device(s) are configured to transmit energy to the energy receiving device(s) without coming into contact with the energy receiving device(s). As depicted in  FIG. 13 a   - 13   d,  the energy transmitting device(s) and energy receiving device(s) are arranged to be disposed at a distance from each other while being in energy transferring relation. Preferably, the distance is between 3 and 20 mm, and even more preferably between 5 and 10 mm. 
     In one embodiment, the energy transmitting device  13 ,  14  is a transmitting coil and the energy receiving device  81  is a receiving coil, whereby the receiving coil receives energy wirelessly by means of induction. 
     In one embodiment, the receiving coil and the transmitting coil are at least partially encapsulated by an electrically insulating material. Thereby, the induction-based energy transmission is achieved while the coils are insulated in case of electrical defects or faults. Due to the energy transmitting circuits being insulated from the exterior, no additional components, such as isolation transformers are required to achieve a safer door operator system. The electrically insulated material may be a plastic material, such as PEEK thermoplastic, polypropylene, PVC etc. The electrically insulating material at least partially encapsulating the receiving coil and the transmitting coil may hence be arranged to extend between said coils so as to create an electrically insulating interface when the receiving and transmitting device are in energy transferring relation. 
     An opening and closing cycle of the door operator is hereby exemplified. In the closed position C the door  8  is positioned in the opening  2  and the opening is closed and the first energy transmitting device  13  charges the one or more batteries  12  of the drive unit  10 . When the control unit  20  receives input of that the door  8  should be moved from the closed position C to the open position O, the control unit  20  controls the drive unit  10  to start. The input could be from a remote control or by pressing an activation button of the door operator system  1 . The energy storage device  12  powers the drive unit  10  to drive the at least one motor  11  that are mounted to the door  8  and connected to the door frame  3 . The at least one motor  11  rotates the pinions  18 . The pinions  18  rotates and interacts with the rack  19  and the drive unit  10  and the door  8  is moved upwards, see arrows in  FIG. 10 . As the drive unit  10  moves the door  8  upwards, the door  8  moves in the first and second frame section  4 ,  6 . The first and second frame section  4 ,  6  guides the movement of the door  8  to guide the door  8  from the closed position C to the open position O. In the open position  8 , the energy receiving device  81  is aligned with the second energy transmitting device  14 , whereby energy transfer is enabled between said energy receiving device  81  and the second energy transmitting device  14  which allows for charging of the energy storage device  12 . 
     In one embodiment, the energy transmitting device  13 ,  14  and the energy receiving device  81  are arranged to be in an energy transferring relation by means of coming into contact during movement of the door  8 . The energy transmitting between the energy transmitting device and the energy receiving device is achieved when the door  8  is between the open and closed position. The energy transmitting device is thus able to provide energy to the energy storage device  12  during the movement of the door  8  by means of a conductive contact between the transmitting device and the receiving device. 
     One of the energy transmitting device or the energy receiving device may be a conductive guiding element and the other of the energy transmitting device or the energy receiving device may be a conductive guide element for interfacing with the conductive guiding element. In one embodiment, the conductive guiding element is a conductive rail, for example a gliding rail, whereby the guided element is configured to move along the conductive rail. 
     In one embodiment, the guide track  16  is a conductive guiding rail connected to the external power source  96 . The wheels  17  may be adapted to be inserted into said guide track  16  may thus be conductive elements. As an alternative, conductive guide elements in form of sliding elements mounted to the door  8  may be arranged to be inserted into the guide track  16  to be in contact with said guide track. The energy storage device  12  may thus be charged continuously during the movement of the door  8  further allowing the motor to be provided with sufficient power to move the door from the closed position C to the open position O. 
     In one embodiment, at least one motor  11  of the drive unit  10  is configured to brake the movement of the door  8  when the door  8  is moved from the open position O to the closed position C. In one embodiment in which the operator system has two motors, both the first and second motor  11   a  and  11   b  are configured to brake the movement of the door  8  when the door  8  is moved from the open position O to the closed position C. 
     In one embodiment, at least one motor  11  of the drive unit  10  is configured to act as a generator and to charge the at least one energy storage device  12  when the door  8  is moved from the open position O to the closed position C. In one embodiment, both the first and second motor  11   a,    11   b  of the drive unit  10  is configured to act as a generator and to charge the at least one energy storage device  12  when the door  8  is moved from the open position O to the closed position C. Due to the weight of the door  8  forcing the door towards the closed position, the at least one motor of the drive unit is caused to rotate, whereby the motor may generate power for charging said energy storage device  12 . Thus, power may be provided to the at least one motor even during frequent opening and closing of the door whereby the door  8  may not reach an open and closed position for extended periods of time. Hence, the energy storage device  12  is charged in a more reliable manner. 
     At least one motor  11  of the drive unit  10  may further comprise a brake. In one embodiment, both the first  11   a  and the second motor  11   b  comprises the brake. In one embodiment, the brake is an electromagnetic brake. The brake is arranged to control/reduce the speed of the door  8  when it is moved from the open position O to the closed position C. In one embodiment, the brake is arranged to keep the door from moving in any position along the trajectory of door between the closed position and open position. Hence the brake may be arranged such that the door is prevented from moving by means of the brake when the power to the motor is cut-off, e.g. when the energy storage device does not provide any energy, e.g. power, to the motor. 
     Referencing  FIG. 12-13 , the door operator system may comprise one or more motors. In one embodiment, the drive unit  10  may comprise at least a first motor  11   a  and a second motor  11   b.  The drive unit  10  may further comprises at least one energy storage device  12 . The at least one energy storage device  12  arranged to power at least one of the motors  11   a,    11   b  is at least connected to one of the first or second motor  11   a,    11   b.  In one embodiment, the at least two motors  11   a,    11   b  are connected to one energy storage device  12 . In an alternative embodiment, one or more energy storage devices  12  are connected to each motor  11   a,    11   b.  In yet one embodiment, the first motor  11   a  is connected to a first energy storage device and the second motor  11   b  is connected to a second energy storage device. The drive unit  10  is mounted to the door  8 . 
     In one embodiment, as depicted in  FIG. 11 , the drive unit  10  is mounted to a section  9   e,  i.e. one of said plurality of horizontal and interconnected sections, of the door  8 . The first motor  11   a  and the second motor  11   b  are arranged on the same section  9   e.  Preferably, the first motor  11   a  and the second motor  11   b  are arranged at different vertical sides of the section  9   e.  Each motor  11   a,    11   b  is thus arranged in conjunction to the first frame section  4  and the second frame section  6 , respectively. 
     In one embodiment, the door  8  could be horizontal, or at least at an angle in view of the closed position C, and the door  8  is positioned inside of the opening  2  and above the opening  2 . When moving from the closed position C to the open position O, the sections  9  of the door that are interconnected will push on each other such that the whole door  8  will move upwards. The sections  9  will rotate and move in relation to each other when moving from a vertical position to the horizontal position. 
     The control unit  10  will control the drive unit  10  to stop when the door  8  is positioned in the open position O. In the open position O the one or more energy storage device  12  is connected to the second energy transmitting device  14  and the second transmitting device  14  charges the one or more energy storage device  12 . 
     In the open position O the drive unit  10  brakes the door  8  to restrict any movement of the door  8 . In one embodiment, this is achieved by the motor(s)  11  acting as a generator  11  during the deceleration of the door prior to the halting of the door  8  to restrict movement between the pinions  18  and rack  19  and/or the brake(s)  22  is activated. The control unit  10  thereafter receives input, either as a signal or after a predetermined time after opening, of that the door  8  should be moved to the closed position C. The brake(s)  22  is released and/or the energy storage device  12  drives the at least first and second motor  11  to start moving the door  8 . 
     In one embodiment, the sectional door operator system uses the gravity acting on the door  8  to move the door  8  from the open position O towards the closed position C. The sections  9  of the door  8  glide in the first and second frame section  4 ,  6  of the door frame  3 . The rack  19  interacts with the pinions  18  and rotates the pinions  18  as the door  8  and the drive unit  10  is moved downwards. 
     In one embodiment, at least one of the first and second motor  11  is run as a generator  11  when moving the door  8  from the open position O to the closed position C. As the pinion(s)  18  are rotated the motor  11  is rotated. The motor  11  reduces the speed of the door  8 . The motor  11  that is connected to the one or more energy storage device  12  charges the one or more energy storage device when moved by the pinion  18  and rack  19  interactions. By using the kinetic energy of the moving door  8  the energy storage device  12  is charged. The charged energy could thereafter be stored in the energy storage device  12  and be used for moving the door  8  from the closed position C to the open position O even if there is a power outage and the first energy transmitting device  13  is not able to charge the energy storage device  12 . This also reduces the energy needed to operate the sectional door operator system  1 . 
     If the one or more sensors identify a person or an object in the path of the door  8 , the sensors will send a signal to the control unit  20  that will control the door  8  and stop the movement of the door  8 . The control unit  20  thereafter controls the door  8  to return to the open position O or to hold until the person or object has moved and control the door to continue to the closed position. As the door  8  moves towards the floor  23  it reaches the closed position C. In the closed position C, the energy storage device  12  of the drive unit will be aligned with the first energy transmitting device  13  and the energy storage device  12  will be charged. 
     The invention has been described above in detail with reference to embodiments thereof. However, as is readily understood by those skilled in the art, other embodiments are equally possible within the scope of the present invention, as defined by the appended claims. It is recalled that the invention may generally be applied in or to an entrance system having one or more moveable door member not limited to any specific type. The or each such door member may, for instance, be a swing door member, a revolving door member, a sliding door member, an overhead sectional door member, a horizontal folding door member or a pull-up (vertical lifting) door member.