JP2005248702A - Sliding door opening and closing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sliding door opening and closing device capable of automatically opening and closing a sliding door main body when moving the sliding door main body slightly in the direction of opening or closing by manual operation and adjusting opening amount of the sliding door main body arbitrarily. <P>SOLUTION: The sliding door main body runs electrically by controlling excitation timing of a coil 4. A controller 7 controls excitation polarity and excitation timing of each coil 4 of a stator block in accordance with a position and direction of running of the sliding door main body. The controller 7 is provided with an assist function for exciting the coil 4 in such a way that the sliding door main body runs in the direction of travel when detecting travel of the sliding door main body in either of directions of opening and closing, an opening function for stopping excitation of the coil 4 when the sliding door main body runs and reaches a fully opened position, and a non-sensing function for inhibiting the assist function for a fixed time from the start of the opening function. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a sliding door opening and closing device that electrically opens and closes a sliding door body.

  2. Description of the Related Art Conventionally, a sliding door opening / closing device that electrically opens and closes a sliding door body is known. Many of these types of sliding door opening and closing devices are used as automatic doors installed at the entrances of shops and offices. Therefore, in this type of sliding door opening and closing device, a human sensor is provided for detecting the presence or absence of a person in a detection area set in the vicinity of the opening to be opened and closed by the sliding door body, and the human sensor detects the presence of the person. And the structure which opens a sliding door main body is employ | adopted.

  On the other hand, recently, housing facilities that are easy to live for the elderly and the physically handicapped have been required, and it has been required to enable electric opening and closing of the opening even in the house. Therefore, a sliding door opening / closing device using a linear motor as a driving source of the sliding door main body has been proposed in order to provide a sliding door main body at an opening in a house and allow the sliding door main body to be opened and closed either manually or electrically (for example, Patent Document 1).

In this type of sliding door opening and closing device, a configuration is considered in which when the sliding door body is slightly moved in either the opening direction or the closing direction, the linear motor is activated and the sliding door body automatically travels. That is, when a person applies force to open and close the sliding door main body for a short time, an assist function for automatically running the sliding door main body is considered.
No. 7-45745

  The present invention has been made in view of the above reasons, and its purpose is to allow the sliding door body to automatically open and close by manually moving the sliding door body slightly in the opening direction or the closing direction. The present invention also provides a sliding door opening and closing device capable of arbitrarily adjusting the opening amount of the sliding door body.

  The present invention relates to a dwelling arranged along the upper edge of the opening of a building, a sliding door body arranged so as to be able to run in the longitudinal direction of the duck, and a plurality of coils housed in the duck. Are arranged in the sliding door body so as to face at least a part of the coils in the stator block, and magnetic poles of different polarities are alternately arranged along the longitudinal direction of the Kamoi. A movable element block having permanent magnets arranged side by side, and a controller that controls the excitation polarity and excitation timing of each coil of the stator block in accordance with the position of the sliding door body and the direction in which the sliding door body is moved. When the movement of the sliding door body in either the opening direction or the closing direction is detected, an assist function for exciting the coil so that the sliding door body travels in the direction of movement, and the sliding door body travels all Upon reaching the position and the open function for stopping the excitation of the coil, the time constant release function from being activated it is characterized by having a dead function of inhibiting the assist function.

  According to the configuration of the present invention, when the sliding door body is opened and closed by providing an assist function, the sliding door body is automatically opened and closed after being manually moved slightly in the opening direction or the closing direction. There is an advantage that the sliding door body can be moved according to the intention of the user. In addition, since the assist function is prohibited by the insensitive function for a certain period of time after the sliding door body reaches the open position and the excitation of the coil is stopped by the open function, if it is within a certain time after the sliding door body reaches the open position There is an advantage that the position of the sliding door body can be adjusted, and the opening amount of the sliding door body can be arbitrarily adjusted.

  As shown in FIG. 2, a door frame 1 is disposed at the periphery of an opening provided in the building (for example, a doorway of the building) so that the sliding door body 10 can run in the door frame 1 within the door frame 1. It is arranged. In the illustrated example, a single sliding door is shown, and the one end of the duck 31 and the sill 32 is arranged so that the one end side in the longitudinal direction has a substantially half width on the other end side. Notches 31a and 32a are formed on the sides. Therefore, the door frame 1 is composed of the duck 31 and the sill 32 and the three vertical frames 33a to 33c. Of the three vertical frames 33a to 33c, one vertical frame 33a is coupled to the narrow end of the duck 31 and the sill 32 and the other one vertical frame 33b is a wide width of the duck 31 and the sill 32. Is coupled to the other end. The remaining one vertical frame 33c is arranged so as to face a part of the vertical frame 33b in the notches 31a and 32a.

  The door frame 1 is assembled in the opening after being assembled, and is fixed to the opening using a fixture such as a nail. In FIG. 2, a nail-like fixture 34 for fixing the duck 31 to the lintel is illustrated, but other members are similarly fixed to the opening. A rail groove 35 is formed in the sill 32 over substantially the entire length in the longitudinal direction, and the door wheel 11 provided on the lower surface of the sliding door body 10 is guided by the rail groove 35. On the other hand, a traveling rail 36 having a U-shaped cross-section opened downward is attached to the lower surface side of the head 31 over the entire length of the head 31, and the upper part of the sliding door body 10 is fitted into the traveling rail 36. That is, the sliding door body 10 travels while being supported by the travel rail 36 and the rail groove 35.

  By the way, as shown in FIG. 3, the power source for running the sliding door main body 10 in this embodiment is a linear motor constituted by a stator block 2 provided in the Kamoi 31 and a mover block 3 provided in the sliding door main body 10. Consists of. As shown in FIG. 4, a concave groove 37 is formed in the head 31, and the stator block 2 is accommodated in the concave groove 37 together with the traveling rail 36.

  As shown in FIGS. 10 and 11, the stator block 2 includes a plurality of coils 4 that are arranged at equal intervals in the longitudinal direction of the Kamoi 31. However, the sensor block 5 is arranged in place of the coil 4 at one place in the longitudinal direction of the head 31. The sensor block 5 has three Hall ICs 6 arranged at equal intervals in the longitudinal direction of the Kamoi 31. The central Hall IC 6 is located at the center of the two adjacent coils 4 and the remaining Hall ICs 6 are arranged in the center. The Hall IC 6 is disposed at a distance of one third of the arrangement pitch of the coils 4. The Hall IC 6 is mounted on the substrate 41, and the substrate 41 is attached to the iron core block 42 constituting the stator block 2 via the spacer 43.

  The iron core block 42 is obtained by implanting a plurality of iron cores 42b in a plate-like yoke portion 42a, and the coil 4 is wound around each iron core 42b. Therefore, if the coil 4 is energized, a magnetic path is formed through the yoke portion 42a. Further, in the stator block 2, a connection board 44 electrically connected to each coil 4 and the board 41 is disposed on the side of the iron core 42 b. In the present embodiment, the coils 4 are configured to be excited in three phases, and the connection substrate 44 connects the coils 4 of each phase to each other. At the end of the connection board 44, a signal connector 45a and a power connector 45b are provided, and the connectors 45a and 45b are connected to a controller 7 which will be described later. An insulating plate 46 is overlaid on the connection board 44.

  By the way, as shown in FIG. 6, a spacer 47 is interposed between the yoke portion 42 a of the stator block 2 and the traveling rail 36, and the stator block 2 is moved together with the traveling rail 36 by an attachment screw 48 passing through the spacer 47. Fixed to Kamoi 31. Thus, by storing the stator block 2 in the head 31, it is possible to configure the head 31 having the stator block 2 with the same size as the head 31 used for the conventional manual sliding door. .

  On the other hand, the mover block 3 that constitutes a linear motor together with the stator block 2 is disposed so as to face each coil 4 in the stator block 2 as shown in FIGS. Permanent magnets 51 in which magnetic poles of different polarities are alternately arranged in the longitudinal direction of the Kamoi 31 are provided on the surface. The permanent magnet 51 is magnetized in the vertical direction, and a yoke plate 52 is fixed to the lower surface of the permanent magnet 51. The yoke plate 52 is longer in the longitudinal direction of the duck 31 than the permanent magnet 51, and both ends of the yoke plate 52 are fixed to the upper surface of the sliding door body 10 by a fixing tool 53 such as a screw. The permanent magnet 51 is formed by arranging a plurality of permanent magnets magnetized in the vertical direction in the longitudinal direction of the duck 31 (longitudinal direction of the yoke plate 52), or by magnetizing the magnetic body with multiple poles. The pitch of the magnetic poles formed on the surface of the permanent magnet 51 facing the coil 4 is set to 2/3 of the pitch of the coil 4. Therefore, by sequentially changing the energization state of the coil 4 according to the polarity of the permanent magnet 51 detected by the Hall IC 6, the magnetic force between the stator block 2 and the mover block 3 is changed by the mover block 3. It can be made to act so as to move straight with respect to the stator block 2, and as a result, the sliding door body 10 can be caused to travel with respect to the head 31.

  As described above, the stator block 2 and the mover block 3 as the elements constituting the linear motor are separately provided in the duck 31 and the sliding door main body 10, respectively. A sliding door driven by a power source can be configured by attaching the mover block 3 to the main body 10 and using the head 31 containing the stator block 2, and the head 31 has the same dimensions as a manual sliding door. Since it can be formed, it becomes possible to replace the manual type sliding door with the electric type sliding door by exchanging the gate 31.

  By the way, the mover block 2 includes a plurality of coils 4 as described above, and a substrate 41 on which a Hall IC 6 is mounted. In order to move the mover block 3 relative to the stator block 2, it is necessary to control the energization timing to the coil 4 based on the output of the Hall IC 6. Therefore, a controller 7 is provided to control the energization timing to the coil 4. The controller 7 is housed in a housing 61 as shown in FIGS. 12 and 13, and as shown in FIGS. 5 and 6, a concave groove 37 is formed on one side in the width direction of the wide portion of the duck 31. It is stored in no part. That is, the controller 7 is arranged near the center in the width direction at the opening of the building. Further, the lower surface of the casing 61 of the controller 7 is aligned with the lower surfaces of other portions of the Kamoi 31. By arranging the housing 61 at such a position, the controller 7 is provided at a position where it is easy to work when operating or maintaining the controller 7.

  Incidentally, the controller 7 has the configuration shown in FIG. 1, and a DC power source rectified and smoothed by a rectifying / smoothing unit 73 from a commercial power source (AC 100 V) 71 via a power switch 72 is supplied to the stator block 2 through a power output unit 74. The coil 4 is configured to be given. The power output unit 74 controls the timing of energizing the coil 4 in accordance with an instruction from the output control unit 70. In addition to the Hall IC 6 described above, the output of the receiving units 76a and 76b that receive a wireless signal using infrared as a transmission medium is input to the output control unit 70. The output control unit 70 includes a microcomputer as a main component, and is supplied with power that is obtained by stabilizing the output voltage of the rectifying and smoothing unit 73 by the control power source unit 77.

  Although two receiving units 76a and 76b are provided, only one receiving unit 76a is stored in the casing 61, and the other receiving unit 76b is stored in a case 63 provided separately. A light receiving window 64 is formed on the lower surface of the housing 61, and the wireless signal enters the receiving unit 76 a through the light receiving window 64. The light receiving window 64 is not formed with a protrusion and does not obstruct the passage through the opening.

  The output control unit 70 controls the traveling of the sliding door body 10 according to the content of the wireless signal received by the receiving unit 76a. That is, opening / closing of the sliding door body 10 can be instructed by a wireless signal using infrared as a medium. The receiving unit 76b not housed in the housing 61 functions equivalently to the receiving unit 76a, and the output control unit 70 also controls the opening / closing of the sliding door body 10 by a wireless signal received by the receiving unit 76b. Indicator lights 66 a and 66 b made of light emitting diodes are arranged in the vicinity of the window 62 and the light receiving window 64 on the lower surface of the casing 61 of the controller 7. The indicator light 66a is lit when power is supplied to indicate whether the power is normally supplied, and the indicator light 66b is lit when a wireless signal from the remote control transmitter 20 is received. The indicator lights 66a and 66b are exposed on the lower surface of the Kamoi 31 and are installed in a place with good visibility.

  As shown in FIG. 14, the case 63 that accommodates the receiving portion 76 b has a light receiving window 65 through which a wireless signal passes, in the center in the longitudinal direction. It is arranged near the center. However, the position where the case 63 is attached is disposed on the opposite side of the casing 61 with the traveling rail 36 on which the sliding door body 10 travels interposed therebetween. In short, the receiving units 76 a and 76 b are arranged on both the front and back sides of the sliding door body 10. Thus, by providing the receiving portions 76a and 76b on the front and back sides of the sliding door body 10, it is possible to instruct to open and close the sliding door body 10 by wireless signals from either the front or back side of the sliding door body 10. The area in which the remote control transmitter 20 for transmitting signals can be used is widened.

  The remote control transmitter 20 includes an operation unit including a pushbutton switch. The operation unit instructs the opening operation unit 21 to instruct the sliding door body 10 to travel in the opening direction and the sliding door body 10 to travel in the closing direction. And a closing operation unit 22. When the opening operation unit 21 is operated, the output control unit 70 activates the opening function, stops the excitation of the coil 4 after running the sliding door body 10 in the opening direction and fully opening the sliding door body 10. Therefore, since the excitation of the coil 4 is stopped after the sliding door body 10 is traveled by the operation of the opening operation portion 21, the opening portion can be kept open. When the sliding door body 10 is opened by the opening function, the output control unit 10 is opened by changing the lighting state of the indicator lights 66a and 66b (for example, blinking lighting) while the sliding door body 10 is opened. The function is activated to notify that the sliding door body 10 is opened. This makes it possible to confirm that there is no abnormality such as a power failure.

  Two or more remote control transmitters 20 that can be used in common by both receiving portions 76a and 76b can be provided, and a remote control having another channel for running the sliding door body 10 arranged in another opening. The transmitter 20 may be used. As described above, since the receiving portions 76a and 76b are provided on both front and back sides of the sliding door body 10, if the remote control transmitter 20 is also arranged on both front and back sides of the sliding door body 10, the sliding door body is carried without carrying around the remote control transmitter 20. The sliding door body 10 can be operated from either the front or back side. Further, when there are a plurality of openings provided with the sliding door main body 10, if different channels are used for the respective openings, it is possible to prevent the sliding door main body 10 of other unintentional opening from being erroneously operated.

  The output control unit 70 also has the assist function described as the conventional configuration. The assist function starts excitation of the coil 4 by detecting a change in the output of the Hall IC 6 and moves the sliding door body 10 by detecting the output change of the Hall IC 6 when the sliding door body 10 is slightly moved in the opening direction or the closing direction. It is a function that automatically runs in the direction. That is, when the sliding door main body 10 is moved a little at first, the sliding door main body 10 can be automatically driven thereafter. However, in the present embodiment, when the sliding door body 10 is fully opened using the opening function, an insensitive function that prohibits the operation of the assist function for a certain time after the sliding door body 10 reaches the fully opened position is output control unit. 70. By this insensitive function, if the sliding door body 10 reaches the fully open position and is within a certain time, the sliding door body 10 can be freely moved, and thereby the opening amount of the opening by the sliding door body 10 can be freely set. It becomes possible to adjust. In other words, it is possible to open the opening a little for indoor ventilation. By using this function, it is possible to freely set the opening amount of the sliding door body 10 without turning off the power by the power switch 72.

  Since the output control unit 70 monitors the traveling speed of the sliding door body 10 based on the output change of the Hall IC 6, the actual traveling of the sliding door body 10 is compared by comparing the excitation timing of the coil 4 with the output change of the Hall IC 6. It is possible to detect that the speed has become lower than the speed at which the sliding door body 10 is about to travel. Such a state is considered to be an overloaded state due to the sliding door main body 10 coming into contact with a person or an obstacle. Therefore, when the output control unit 70 detects the overloaded state, the above-described opening function causes the sliding door. After moving the main body 10 in the opening direction, the excitation of the coil 4 is stopped. As a result, it is possible to prevent power from being consumed unnecessarily due to the continued overload condition, thereby saving energy.

  Since a plurality of remote control transmitters 20 are provided as described above, when a remote control transmitter 20 is instructed to open the sliding door main body 10 and a person is about to pass through, the same is set by another remote control transmitter 20. The case where it is instructed to close the sliding door main body 10 can be considered. Therefore, the output control unit 70 is provided with a close invalidation function, and the remote control transmitter 20 instructs to close the sliding door body 10 until the sliding door body 10 starts to travel in the opening direction and then moves to the fully opened position. I ignore it even if there is. In this way, since the operation of the closing operation unit 22 of the remote control transmitter 20 is invalidated while traveling in the opening direction in which the sliding door body 10 is traveling, when trying to pass through the opening, The traveling direction of the sliding door main body 10 is not reversed and does not collide with the sliding door main body 10 and can pass through the opening safely. If the sliding door main body 10 reaches the fully open position, a person who is going to pass through the opening can be surely seen, and therefore, there is little possibility that another person operates the closing operation part 22.

  In addition, the closing invalidation function is not performed until the sliding door body 10 starts traveling in the opening direction after the sliding door body 10 starts traveling in the opening direction, but to the extent that a person passes through the opening after the sliding door body 10 starts traveling in the opening direction A human sensor with a detection area in the vicinity of the opening is provided for a set period of time, as will be described later, and human detection is performed by the human sensor after the sliding door body 10 starts traveling in the opening direction. It is also possible to make it a period until it is not done.

  By the way, lids 61 a and 61 b are detachably attached to both ends of the casing 61 of the controller 7 in the longitudinal direction. One lid 61a covers a connection portion connected to the stator unit 2, and a signal connector 78 and a power connector 79 are accommodated in this portion. A connection line 81 is connected to the connector 78 as shown in FIG. 8, and the connection line 81 is connected to the connector 45a as shown in FIG. Further, a connection line 82 is connected to the connector 79 as shown in FIG. 8, and the connection line 82 is connected to the connector 45b as shown in FIG. These connection lines 81 and 82 are wired inside the Kamoi 31 and need not be wired outside the Kamoi 31. That is, no wiring other than the power supply wire is required at the time of construction, and wiring construction is easy.

  A power switch 72 and a power terminal 77 are provided in a portion corresponding to the other lid 61b, and the power terminal 77 is concealed by the lid 61b, but the operation part of the power switch 72 is exposed to the lower surface side through the lid 61b. It has become. The power terminal 77 has a quick connection terminal structure, and when the cover 61b is removed, the operation hole 77b for operating the wire insertion port 77a and the release button (not shown) is exposed. Here, the quick connection terminal structure is one in which a wire is connected and disconnected by a lock spring (not shown) made of a leaf spring, and the lock spring is simply inserted from the wire insertion port 77a. Electric wires are connected and disconnected. In addition, if a tool such as the tip of a flathead screwdriver is inserted into the operation hole 77b and the release button is pressed, the release button can bend the lock spring and release the holding of the electric wire by the lock spring. It is configured.

  Thus, at the time of construction, if the electric power supply electric wire is inserted into the electric wire insertion port 77a and the cover 61b is attached, the electric wire is not exposed, and only the operation part of the power switch 72 is exposed on the lower surface of the duck 31. Thus, since the power switch 72 is exposed on the lower surface side of the head 31, the operation of the power switch 72 is facilitated. The electric wire is drawn from the vicinity of the end of the Kamoi 31 to the outside of the Kamoi 31 and wired inside the wall. That is, since the casing 61 of the controller 7 that stores the receiving unit 76a and the case 63 that stores the receiving unit 76b are stored in the hall 31, the wiring of the receiving units 76a and 76b, the controller 7 and the stator block 2 are stored. Wiring between and the like is performed inside the Kamoi 31 and these are assembled at the factory, so there is no need to perform troublesome wiring work during construction. As a result, it is only necessary to wire the electric power supply wire at the time of construction on site, and the wiring work at the site becomes easy. In addition, as described above, the head 31 used in the present embodiment has substantially the same dimensions as the head of the manual sliding door. Therefore, only the head 31 is replaced with the upper surface of the sliding door main body 10 with respect to the manual sliding door. An electric sliding door can be configured simply by attaching the mover block 3, and an existing manual sliding door can be replaced with an electric sliding door at low cost.

  In the above-described embodiment, a single sliding door is illustrated, but a similar configuration can be adopted even with a sliding door.

  By the way, the embodiment described above is assumed to be used in a house or the like, and as described in the conventional configuration, in order to prevent the sliding door body 10 from being inadvertently opened only by approaching a person. In the above description, the human sensor is not provided. However, depending on the purpose, it may be desirable to provide a human sensor and open the sliding door body 10 without giving an instruction from the remote control transmitter 70. Below, the case where the sliding door main body 10 is automatically opened using a human sensor is described.

  The human sensor 75 uses a pyroelectric infrared sensor that detects the presence or absence of a person using heat rays radiated from the human body, and is connected to the output control unit 70 as shown by a two-dot chain line in FIG. Is done. This type of human sensor 75 receives heat rays emitted from a person and changes the output when a change of a predetermined amount or more occurs in the heat dose. That is, the human sensor 75 is a passive type and does not need a function of irradiating an object with infrared rays, and thus has a simple configuration, is not required to be cooled, and is inexpensive, space-saving and easy to handle. . The detection area of the human sensor 75 can be easily set by optically controlling the visual field, and the detection area can be set around the opening with a good balance. As shown by a two-dot chain line in the figure, a single window 62 that allows infrared light to pass through a portion corresponding to the human sensor 75 is formed on the lower surface of the housing 61 of the controller 7. The window 62 is formed in the center of the casing 61 in the longitudinal direction, and the controller 7 is located near the center of the sliding door body 10 in the traveling direction at the opening where the sliding door body 10 opens and closes. Can be formed in a well-balanced manner.

  By the way, the output control unit 70 moves the sliding door body 10 in the opening direction so as to open the opening while the presence of the person is detected by the human sensor 75, and then stops the excitation of the coil 4. It has an opening function that keeps the sliding door body 10 open. That is, when the presence of the person is detected by the human sensor 75, the sliding door body 10 is fully opened, but thereafter, the excitation of the coil 4 is stopped and kept in the open position. In general, in an automatic door, the opening is closed after the presence of a person is no longer detected. However, in this embodiment, the operation of closing the sliding door body 10 in association with the output of the human sensor 75 is not performed. Here, the configuration in which the sliding door body 10 is opened using the human sensor 75 is the same as that of the automatic door. However, when the sliding door main body 10 is moved in the closing direction, it does not depend on the output of the human sensor 75. If only the function of the output control unit 70 is changed without changing the number of parts with respect to the configuration, the opening function can be realized. The human sensor 75 can also be used for defining the period of the closing invalidation function as described above.

It is a block diagram which shows the controller used for embodiment of this invention. It is the schematic block diagram which showed typically the whole structure same as the above. It is a schematic block diagram of the principal part same as the above. It is a schematic block diagram of the principal part same as the above. The duck used for the above is shown, (a) is a plan view, (b) is a front view, (c) is a bottom view, and (d) is a rear view. It is a side view of the duck used for the same. It is the A section enlarged view of FIG. It is the B section enlarged view of FIG. It is the C section enlarged view of FIG. The stator block used for the above is shown, (a) is a front view, (b) is a bottom view, (c) is a rear view, and (d) is a plan view. It is a rear view of the state which attached the connection board | substrate to the stator block used for the same as the above. The controller used for the above is shown, (a) is a bottom view, (b) is a front view, (c) is a plan view, and (d) is a rear view. It is a decomposition | disassembly bottom view which shows the controller used for the same as the above. The case used for the above is shown, (a) is a bottom view, (b) is a front view, (c) is a plan view, and (d) is a side view.

Explanation of symbols

2 Stator Block 3 Movable Block 4 Coil 7 Controller 10 Sliding Door Main Body 20 Remote Control Transmitter 21 Open Operation Unit 22 Close Operation Unit 31 Kamoi 51 Permanent Magnet 66a, 66b Indicator 70 Output Control Unit 75 Human Sensor 76a, 76b Receiver

Claims (1)

  A duck arranged along the upper edge of the opening of the building, a sliding door body arranged so as to be able to run in the longitudinal direction of the duck, and a plurality of coils housed in the duck and the length of the duck Stator blocks arranged in a direction, and permanent magnets arranged in the sliding door main body so as to face at least a part of the coils in the stator blocks and arranged with magnetic poles of different polarity alternately along the longitudinal direction of the head And a controller that controls the excitation polarity and excitation timing of each coil of the stator block in accordance with the position of the sliding door body and the direction in which the sliding door body is moved. When detecting movement in either the opening direction or the closing direction, an assist function that excites the coil so that the sliding door body travels in the moving direction, and the sliding door body travels to reach the fully open position. That when the sliding door opening and closing device and the release function for stopping the excitation of the coil, the time constant release function from being activated, characterized in that it comprises a dead function of inhibiting the assist function.

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