Magnetic device for motorized roller shutters for windows and / or doors

Abstract

Magnetic device (100) for a motorized roller shutter (S) for windows or doors; the magnetic device (100) comprises a boxed frame (1), an endless screw (2) housed in the boxed frame (1) and rotatable around an axis of rotation (Z2), a first gear (3) and a second gear (4) meshing with the endless screw (2) so that the gears (3, 4) are driven into rotation by the endless screw (2); wherein the gears (3,4) have a different number of teeth (30, 40) so that the two gears (3,4) rotate with different angular velocities; the magnetic device (100) comprises a first magnet (53) applied to the first gear (3), a second magnet (54) applied to the second gear (4), a first magnetic detector (63) suitable for detecting the magnetic field (B1) generated by the first magnet (53) and a second magnetic detector (64) suitable for detecting the magnetic field (B2) generated by the second magnet (54).

Description

[0001] The present patent application for industrial invention relates to a magnetic device for motorized roller shutters for windows and / or doors.

[0002] In the present description, the term "roller shutters" refers to a blind, a shutter and any other similar element or structure that is wound around a winding shaft.

[0003] For some time now, the operation of the winding shafts of roller shutters has been automated by means of electric gear motors, whose rotation in one direction or in the other direction determines the descending travel or the ascending travel of the roller shutter.

[0004] The maximum travel of this type of roller shutters is controlled and determined by limit systems suitable for detecting when the roller shutter is completely wound on the winding shaft or when the roller shutter is unwound from the winding shaft to cover the opening of a window or door.

[0005] The limit systems that are currently available on the market comprise mechanical limit systems and electronic limit systems.

[0006] The mechanical limit systems comprise limit devices that are activated by respective sliders, in such a way to interrupt the power supply of the gear motor as soon as one of the sliders interferes with its limit device. Obviously, one of the two limit devices is designed to stop the gear motor when the roller shutter has completed its ascending travel, whereas the other limit device intervenes when the roller shutter has completed its descending travel. The two sliders are screwed onto respective threaded rods that rotate in clockwise and in anti-clockwise direction and are driven into rotations with the same direction by the gear motor that drives the winding shaft.

[0007] More precisely, the threaded rods are disposed in parallel position and mesh with a toothed crown formed inside a driving ring driven by the gear motor. Therefore, the rotation of the driving ring determines the identical simultaneous travels with opposite direction of the two sliders along the respective threaded rods.

[0008] When installing the roller shutter, the operator must set the two sliders according to the maximum travel required. The initial setting operation is carried out by trial and error, moving the sliders manually along the rods and testing the travel of the roller shutter.

[0009] Evidently, such a setting is a rather complicated and time-consuming operation.

[0010] Furthermore, these systems are affected by a significant thermal drift that causes the system to behave differently in hot periods compared to cold ones.

[0011] Electronic systems have been designed to overcome the problems that impair the mechanical systems.

[0012] Electronic systems use a rotary encoder that is a sensor that transforms the angular mechanical movement into a series of digital electrical impulses that are sent to a control unit of the encoder that processes the impulses to define the position of the roller shutter at any given moment. The control unit of the encoder sends the position of the roller shutter to a control unit of the gear motor that in turn compares it with the upper limit position or with the lower limit position that are stored therein. When the control unit verifies that the position detected by the control unit of the encoder is equal to the upper or lower limit position stored in the control unit of the gear motor, the control unit immediately stops the gear motor.

[0013] The setting of the upper and lower limits is very simple, as the operator only needs to perform the following operations with a control means (such as a remote control or the like): activate the gear motor until the roller shutter reaches its upper or lower limit position; and once such a limit position has been reached, store the position detected by the encoder in the control unit.

[0014] Although the setting of the limit devices of the electronic systems by means of the encoder is extremely simple, the electronic systems are impaired by some drawbacks.

[0015] Firstly, the electronic systems are extremely expensive.

[0016] Furthermore, the electronic systems require a dedicated control unit associated with the encoder that is suitable for processing the signals of the encoder and constantly tracing the position of the roller shutter.

[0017] Moreover, the electronic systems are impaired by a problem that arises in case of a blackout or a power failure.

[0018] In fact, in the event of a blackout or a power failure, the dedicated control unit of the encoder would no longer be able to trace the position of the roller shutter if the roller shutter is raised or lowered manually. Otherwise said, in case of a power failure, the dedicated control unit of the encoder would completely lose the information on the position of the roller shutter and therefore, when the electrical power is restored, it will be necessary to reset and memorize the limit positions.

[0019] To overcome such a problem, the electronic systems have been equipped with an external backup battery that is connected to the control unit of the encoder by means of a power cable. This allows the encoder and its control unit to continue to operate even in the case of a power failure, and therefore to trace the position of the roller shutter without having to perform a new setting when the power is restored.

[0020] Obviously, the provision of the battery and of the power cable makes this solution bulky and expensive.

[0021] TWM610857U and AU2022200433A1 describe a device for operating an electric rolling door comprising an electromechanical control system of the upper and lower travel position of the roller shutter that is wound on the winding roller.

[0022] The purpose of the present invention is to overcome the drawbacks of the prior art by devising a new magnetic device for motorized roller shutters that allows for: easily setting the limit positions of the roller shutters; and immediately tracing the position of the roller shutter when the electrical power is restored after a blackout, without the need to use a backup battery to power the magnetic device during the time when there is no electrical power.

[0023] A further purpose of the present invention is to devise a magnetic device that is compact and simple to install.

[0024] These purposes are achieved in accordance with the invention with the characteristics listed in the attached independent claim 1.

[0025] Advantageous implementations appear from the dependent claims.

[0026] The magnetic device according to the invention is defined by claim 1.

[0027] For greater explanatory clarity, the description of the magnetic device according to the invention continues with reference to the attached drawings, which are for illustrative and not limitative purposes only, wherein: Fig. 1 is an axonometric view of the magnetic device according to the invention; wherein in said Fig. 1 the boxed frame of the magnetic device according to the invention is shown in transparency so as to identify the elements disposed inside the boxed frame; Fig. 2 is an exploded axonometric view of the magnetic device according to the invention; Fig. 3 is a sectional view of the magnetic device according to the invention taken along a plane orthogonal to the axis of rotation of an endless screw of the magnetic device; Fig. 4 shows the magnetic device sectioned as in Fig. 3 with an exploded view of its parts. Fig. 5 shows a diagrammatic front view of the assembly consisting of a winding shaft with a roller shutter that is wound around it, a gear motor to move the winding shaft, a magnetic device according to the invention, a control unit for the gear motor and a control device for said control unit; Fig. 6 is a block diagram illustrating the connections between the electronic elements of the magnetic device according to the invention and the control unit for the gear motor; Fig. 7 is a schematic top view of a diametrical magnet of the magnetic device according to the invention; Fig. 8 shows two graphs that illustrate the variation of the magnetic field values detected by the two magnetic detectors of the magnetic device as a function of the position of the roller shutter.

[0028] With reference to the attached figures, a magnetic device according to the invention is described, which is comprehensively indicated with the reference numeral (100).

[0029] With reference to Fig. 5, the magnetic device (100) according to the invention is part of a motorization assembly (G) for roller shutters comprising: a winding shaft (A); a roller shutter (S) wound around the winding shaft (A); an electric gear motor (M) connected to the winding shaft (A) to rotate the winding shaft (A) in a winding direction and in an unwinding direction opposite to the winding direction; the magnetic device (100) according to the invention; a control unit (U) operatively connected to the gear motor (M) to start the gear motor (M) to move the winding shaft (A) or to stop the gear motor (M) to stop the winding shaft (A); and a control device (D) suitable for being operated by a user and operationally connected to the control unit (U) to send an ascent command (c1) suitable for starting the gear motor (M) to rotate the winding shaft (A) in the winding direction, or a descent command (c2) suitable for starting the gear motor (M) to rotate the winding shaft (A) in the unwinding direction or a stop command (c3) suitable for stopping the gear motor (M).

[0030] The control device (D) may consist of a remote control or a smart device connected to the control unit (U) via Bluetooth or similar wireless technologies.

[0031] Now with reference to Figs. 1, 2, 3 and 4, the magnetic device (100) according to the invention comprises a boxed frame (1). The boxed frame (1) comprises a base (11), a cover (12), and an intermediate plate (13) disposed between the base (11) and the cover (12). The intermediate plate (13) has a first face (131) facing the base (11) and a second face (132) facing the cover (12). The boxed frame (1) comprises connecting means (14) to connect the base (11), the cover (12) and the intermediate plate (13).

[0032] The cover (12) of the boxed frame (1) comprises sleeves (R12) inserted in through holes (R13) of the intermediate plate (13). Coaxial threaded holes (R11) are drilled on the base (11) facing the sleeves (R12). The connecting means (14) comprise screws inserted in the sleeves (R12) and screwed into the threaded holes (R11) of the base (11). The screws (140) of the connecting means (14) tighten the base (11), the cover (12) and the intermediate plate (13) together.

[0033] The magnetic device (100) comprises an endless screw (2) housed in the boxed frame (1) and rotatable around an axis of rotation (Z2). The endless screw (2) is suitable for being connected to the gear motor (M) of the winding shaft (A).

[0034] The endless screw (2) comprises two coaxial end pins (20, 21) that protrude from two opposite ends of the endless screw (2).

[0035] The intermediate plate (13) and the cover (12) comprise seats (Q) for supporting said end pins (20, 21) of the endless screw.

[0036] In particular, said seats (Q) comprise semi-holes (q2, q3) obtained on the cover (12) and on the intermediate plate (13) that define holes through which the end pins (20, 21) of the endless screw are inserted, when the intermediate plate (13) is coupled with the cover (12).

[0037] At least one of the holes defined by the semi-holes is a through hole so that the respective end pin (20, 21) can be inserted through it.

[0038] The end pin that is inserted into the through hole consists of an attachment pin (20) that is suitable for being connected to the gear motor (M) so that the endless screw (2) is rotated by the gear motor (M). Therefore, when the gear motor (M) is operated, the endless screw (2) rotates together with the winding shaft (A) because they are driven by the same gear motor (M). Furthermore, the endless screw (2) and the winding shaft (A) rotate at the same angular speed and therefore, when the winding shaft (A) completes a 360° rotation, also the endless screw (2) completes a 360° rotation.

[0039] The central body of the endless screw (2) provided with the thread is housed in a seat defined by two concave cavities (h3, h2) opposite to each other and respectively formed on the intermediate plate (13) and on the cover (12).

[0040] The magnetic device (100) comprises a first gear (3) and a second gear (4) that are housed in the boxed frame (1) and have respective axes of rotation (Y3, Y4) parallel to each other and orthogonal to the axis of rotation (Z2) of the endless screw (2).

[0041] Both gears (3, 4) have teeth (30, 40) meshing with the endless screw (2) so that the gears (3, 4) are driven into rotation by the endless screw (2).

[0042] Preferably, the first gear (3) and the second gear (4) are arranged in diametrically opposite positions with respect to the axis of rotation (Z2) of the endless screw (2).

[0043] With reference to Figs. 2 and 4, each gear (3, 4) comprises: a toothed wheel (3a, 4a) on which the teeth (30, 40) of the gear (3, 4) are formed; a first rotation pin (3b, 4b) that protrudes axially from one face of the toothed wheel (3a, 4a); a second rotation pin (3c, 4c) that protrudes axially from one face of the toothed wheel (3a, 4a) opposite to the face from which the first rotation pin (3b, 4b) protrudes.

[0044] The intermediate plate (13) comprises through cavities (130), in each of which the first rotation pin (3b, 4b) of one of the two gears (3, 4) is inserted in such a way to rotate.

[0045] The cover (12) comprises cavities (120) that are coaxial with the cavities (130) of the intermediate plate (13), in each of which the second rotation pin (3c, 4c) of one of the two gears (3, 4) is inserted in such a way to rotate.

[0046] The gears (3, 4) have a different number of teeth (30, 40) so that the two gears (3, 4) rotate at different angular speeds even if they mesh with the same endless screw (2).

[0047] The magnetic device (100) further comprises a first magnet (53) with diametral magnetization applied to the first gear (3) in such a way to rotate with the first gear around the axis of rotation (Y3) of the first gear.

[0048] The magnetic device (100) further comprises a second magnet (54) with diametrical magnetization applied to the second gear (4) in such a way to rotate with the second gear around the axis of rotation (Y4) of the second gear.

[0049] In particular, each magnet (53, 54) is positioned in a seat that is formed in central position on one base end of the first rotation pin (3b, 4b) of the gear (3, 4).

[0050] With reference to Fig. 7, it should be noted that the term "diametral magnet" (53, 54) refers to a magnet that is substantially shaped like a disc with a N-S polarity aligned along a diameter of the magnet or along an axis passing through the center and perpendicular to the plane on which the magnet lies.

[0051] By way of example, if the diametral magnet of Fig. 7 is rotated in the direction of the arrow (Fv) by an angle (α) around an axis passing through the center (50) of the diametrical magnet (53, 54) and perpendicular to the plane on which the diametrical magnet lies, the N-S poles of the diametrical magnet (53, 54) rotate by the same angle (α), positioning themselves in the position indicated by N'-S' in Fig. 7. Obviously, the diametral magnet (53, 54) will generate a different magnetic field based on the position of the poles. Therefore, by rotating the gear (3, 4), the diametral magnet (53, 54) rotates in the same way and consequently the magnetic field emitted by the magnet (53, 54) varies. When the magnet (53, 54) rotates by a round angle, the magnetic field generated by the magnet is the same.

[0052] The magnetic device (100) comprises a first magnetic detector (63) suitable for detecting a first magnetic field value (B1) generated by the first magnet (53) and a second magnetic detector (64) suitable for detecting a second magnetic field value (B2) generated by the second magnet (54).

[0053] Preferably, the first magnetic detector (63) and the second magnetic detector (64) are supported by an electronic board (6) housed in the boxed frame (1). The electronic board (6) comprises a terminal board (6a) for the electrical connection. For illustrative purposes, the magnetic detectors (63, 64) are Hall detectors, or magnetoresistive detectors and other detectors capable of detecting the magnetic field values (B1, B2) generated by the magnets (53, 54).

[0054] The electronic board (6) is housed in a seat (110) obtained on the base (11). In particular, the base (11) has the shape of a frame that perimetrally defines the seat (110).

[0055] The base (11) comprises support platforms (111) disposed in the seat (110) on which the electronic board (6) rests. The electronic board (6) is fixed to the base (11) by means of screws (not shown in the attached figures) that are inserted into holes in the electronic board (6) and engaged in holes made in the support platforms (111).

[0056] Now going back to the gears (3, 4), as mentioned previously, the gears (3, 4) have a different number of teeth (30, 40) so that they rotate at different angular speeds.

[0057] Therefore, when one of the two gears (3, 4) makes a 360° rotation, the other one has not completed a 360° rotation.

[0058] Fig. 8 diagrammatically shows two graphs that illustrate the variation of the magnetic field values (B1, B2) detected by the first magnetic detector (63) and by the second magnetic detector (64) according to the position of the roller shutter (S).

[0059] As it can be seen, depending on the position of the roller shutter (S), the magnetic field values (B1, B2) detected by the first magnetic detector (63) and by the second magnetic detector (64) have a sinusoidal trend with different periods (T1, T2). This is due to the different angular velocity at which the two gears (3, 4) rotate because of the different number of teeth (30, 40) of the two gears (3, 4).

[0060] By combining the first magnetic field value (B1) detected by the first magnetic detector (63) with the second magnetic field value (B2) detected by the second magnetic detector (64), it is possible to trace the position of the roller shutter (S).

[0061] According to a preferred embodiment of the invention, the number of teeth (30) of the first gear (3) and the number of teeth (40) of the second gear (4) are prime numbers. It should be noted that in the present patent application the term "prime numbers" means that the number of teeth (30) of the first gear (3) and the number of teeth (40) of the second gear (4) have the value "1" as their highest common factor. In this way it is possible to trace the position of the rolling shutter (S) in an extremely long travel between the upper limit position and the lower limit position, avoiding the presence of two or more positions with the same combination of magnetic field values (B1, B2).

[0062] According to a preferred embodiment of the invention, the first gear (3) has fifteen teeth (30), whereas the second gear (4) has sixteen teeth (40).

[0063] The aforementioned numbers of teeth (30, 40) make it possible to control a rather long travel of the roller shutter (S) between the upper limit position and the lower limit position, using a magnetic device (100) that is small in size and compact.

[0064] As already mentioned, in order to identify the position of the roller shutter (S) the first magnetic field value (B1) detected by the first magnetic detector (63), and the second magnetic field value (B2) detected by the second magnetic detector (64) must be combined to trace the position of the roller shutter (S).

[0065] Such a calculation process is performed by the control unit (U) that manages the gear motor (M).

[0066] With reference to Figs. 5 and 6, the control unit (U) is operatively connected to the magnetic detectors (63, 64) of the magnetic device (100) to receive the first magnetic field value (B1) detected by the first magnetic detector (63) and the second magnetic field value (B2) detected by the second magnetic detector (64).

[0067] The control unit (U) has a memory (U1) wherein an upper limit position (FS) of the roller shutter (S) and a lower limit position (FI) of the roller shutter (S) are stored.

[0068] A combination of a first upper magnetic value (fs1) and of a second upper magnetic value (fs2) corresponding to the magnetic field values detected by the first magnetic detector (63) and by the second magnetic detector (64) when the rolling shutter (S) is completely wound around the winding shaft (A) is associated with the upper limit position (FS).

[0069] A combination of a first lower magnetic field value (fi1) and of a second lower magnetic field value (fi2) corresponding to the magnetic field values detected by the first magnetic detector (63) and by the second magnetic detector (64) when the rolling shutter (S) is unwound from the winding shaft (A) and covers the opening of a window or door is associated with the lower limit position (FI).

[0070] In addition, a plurality of intermediate positions can be stored in the memory (U1), each of which is associated with a specific combination of a first magnetic field value and of a second magnetic field value.

[0071] The control unit (U) comprises calculation means (U2) configured to calculate the position (FX) of the roller shutter (S) based on a combination of the magnetic field values (B1, B2) detected by the magnetic detectors (63, 64).

[0072] By way of example, said calculation means (U2) comprise a software program that executes parametric formulas using the magnetic field values (B1, B2) detected by the magnetic detectors (63, 64) as input and the first and second magnetic values (fs1, fi1, fs2, fi2) of the limit positions (FS, FI), the diameter of the winding shaft (S), the diameter, the pitch and other information of the endless screw (2) and the number of teeth (30, 40) of the gears (3, 4) as parameters in order to calculate the position (FX) of the rolling shutter (S).

[0073] If the intermediate positions are stored in the memory (U1) in addition to the limit positions (FS, FI), then the calculation means (U2) can be configured in such a way as to identify the position (FX) of the roller shutter (S) among the positions stored in the memory (U1) of the control unit (U1).

[0074] The control unit (U) additionally comprise check means (U3) configured to verify if the position (FX) of the roller shutter (S) is comprised or not in a range between the upper limit position (FS) and the lower limit position (FI).

[0075] In particular, the check means (U3) are configured to check that: every time the control unit (U) receives the ascent command (c1), the position (FX) of the roller shutter (S) does not go above the upper limit position (FS); and every time the control unit (U) receives the descent command (c2), the position (FX) of the roller shutter (S) does not go below the lower limit position (FI).

[0076] If the check means (U3) verify that, following to the ascent command (c1) or the descent command (c2), the rolling shutter (S) can go above the upper limit (FS) or can go below the lower limit (FI), then the control unit (U) stops the gear motor (M) or doesn't start the gear motor (M). Otherwise said, the check means (U3) verify that the ascent command (c1) or the descent command (c2) received from the control device (D) is compatible with the position (FX) of the roller shutter (S).

[0077] Following is a description of how to set the upper limit and the lower limit of the rolling shutter (S) after the installation of the motorization assembly.

[0078] In order to set the upper limit, the user sends an ascent command (c1) to the control unit (U) and then sends a stop command (c3) to the control unit (U) when the rolling shutter (S) is completely wound around the winding shaft (A). At this point the user sends a save command to the control unit (U) so that the control unit (U) stores the upper limit position (FS) associated with the two upper magnetic field values (fs1, fs2) detected by the two magnetic detectors (63, 64) in its memory (U1).

[0079] Then, in order to set the lower limit, the user sends a descent command (c2) to the control unit (U) and, when the roller shutter (S) has reached a preset descent position, the user sends a stop command (c3) to the control unit (U). At this point the user sends a save command to the control unit (U) so that the control unit (U) can store the lower limit position (FI) associated with the two lower magnetic field values (fi1, fi2) detected by the two magnetic detectors (63, 64) in its memory (U1).

[0080] After storing the two limit positions (FI, FS), the user can manage the ascent and the descent of the roller shutter (S) using the control device (D), being sure in any case that the gear motor (M) will be stopped by the control unit (U) as soon as the roller shutter (S) reaches the upper limit position (FS) or the lower limit position (FI).

[0081] Therefore, the setting of the limit positions (FI, FS) is an extremely quick and easy operation.

[0082] It should be noted that, thanks to the provision of the magnetic device (100) according to the present invention, it is no longer necessary to use a backup battery to ensure the operation of the magnetic device (100) in case of power failure from the mains.

[0083] In fact, in the event of a power failure or blackout, if the winding shaft (A) were to be moved manually to lower or raise the roller shutter (S), such a manual movement would in any case cause a rotation of the endless screw (2), which in turn would cause a rotation of the gears (3, 4) that carry the magnets (53, 54). Obviously, during the power failure, the magnetic detectors (63, 64) will not operate and therefore no magnetic field value will be sent to the control unit (U).

[0084] However, as soon as the power supply is restored, the magnetic detectors (63, 64) will immediately detect the magnetic field values (B1, B2) generated by the two magnets (53, 54) (which depend on the position of the two magnets (53, 54)) and will send them to the control unit (U) which, using the calculation means (U2), will immediately trace the position of the roller shutter (S) by combining the magnetic field values (B1, B2) received.

[0085] Therefore, thanks to the provision of the new magnetic device (100) according to the invention, in order to trace the position of the roller shutter (S) it is not necessary to constantly monitor the position of the roller shutter during the manual movement of the roller shutter during the power failure because the position of the roller shutter (S) exclusively depends on the position of the two magnets (53, 54).

[0086] Otherwise said, it is no longer necessary to use a backup battery to power the magnetic device (100) in the event of a power failure.

[0087] Numerous variations and modifications can be made to the present embodiment of the invention by an expert of the field, which still fall within the scope of the invention as expressed in the attached claims.

[0088] By way of example, although the description and the attached images show that the magnetic device (100) comprises two gears, two magnets and two magnetic detectors, nothing would change if the magnetic device (100) comprised three or more gears, three or more magnets and three or more magnetic detectors.

Claims

1. Magnetic device (100) for a motorized roller shutter (S) for windows or doors; said magnetic device (100) comprising: - a boxed frame (1); - an endless screw (2) housed in the boxed frame (1) and rotatable around an axis of rotation (Z2); said endless screw (2) being suitable for being connected to a gear motor (M) of a winding shaft (A) wound by a roller shutter (S); - a first gear (3) and a second gear (4) housed in the boxed frame (1) and having respective axes of rotation (Y3, Y4) parallel to each other and orthogonal to the axis of rotation (Z2) of the endless screw (2); wherein both gears (3, 4) have teeth (30, 40) meshing with the endless screw (2) so that the gears (3, 4) are driven into rotation by the endless screw (2); wherein the teeth (30, 40) of the gears (3, 4) are in different number so that the two gears (3,4) rotate with different angular velocities even though they mesh with the same endless screw (2); - a first magnet (53) with diametral magnetization applied to the first gear (3) in such a way to rotate with the first gear around the axis of rotation (Y3) of the first gear; - a second magnet (54) with diametral magnetization applied to the second gear (4) in such a way to rotate with the second gear around the axis of rotation (Y4) of the second gear; - a first magnetic detector (63) suitable for detecting a first magnetic field value (B1) generated by the first magnet (53); and - a second magnetic detector (64) suitable for detecting a second magnetic field value (B2) generated by the second magnet (54).

2. The magnetic device (100) according to claim 1, wherein the number of teeth (30) of the first gear (3) and the number of teeth (40) of the second gear (4) are prime numbers.

3. The magnetic device (100) according to any one of the preceding claims, wherein said first gear (3) and said second gear (4) are arranged in diametrically opposed positions relative to the axis of rotation (Z2) of the endless screw (2).

4. The magnetic device (100) according to any one of the preceding claims, wherein each gear (3, 4) comprises: - a toothed wheel (3a, 4a) whereon said teeth (30, 40) of the gear (3, 4) are formed; - a first rotation pin (3b, 4b) protruding axially from a face of the toothed wheel (3a, 4a); - a second rotation pin (3c, 4c) protruding axially from a face of the toothed wheel (3a, 4a) opposite the face from which the first rotation pin (3b, 4b) protrudes.

5. The magnetic device (100) according to any one of the preceding claims, comprising an electronic board (6) housed in the boxed frame (1) supporting the first magnetic detector (63) and the second magnetic detector (64) and comprising a terminal board (6a) for electrical connection.

6. The magnetic device (100) according to any one of the preceding claims, wherein said boxed frame (1) comprises: - a base (11); - a cover (12); - an intermediate plate (13) interposed between the base (11) and the cover (12); said intermediate plate (13) comprises a first face (131) facing the base (11) and a second face (132) facing the cover (12); - connecting means (14) that connect the base (11), the cover (12) and intermediate plate (13) to each other.

7. The magnetic device (100) according to claim 6 when dependent on claim 4 and 5, wherein said base (11) comprises a seat (110) configured so as to accommodate the electronic board (6); wherein said intermediate plate (13) and said cover (12) comprise seats (Q) for supporting end pins (20, 21) of the endless screw (2); wherein said intermediate plate (13) comprises recesses (130) in each of which the first rotation pin (3b, 4b) of one of the gears (3, 4) is rotatably inserted; wherein said cover (12) comprises cavities (120) coaxial with the cavities (130) of the intermediate plate (13), in each of which the second rotation pin (3c, 4c) of the gear (3, 4) is rotatably inserted.

8. Roller shutter motorization assembly (G) comprising: - a winding shaft (A); - a roller shutter (S) wound around the winding shaft (A); - an electric gear motor (M) connected to the winding shaft (A) to drive the winding shaft (A) into rotation in a winding direction and in an unwinding direction; - a magnetic device (100) according to any one of the preceding claims; wherein said endless screw (2) of the magnetic device (100) is connected to the gear motor (M) in order to be driven into rotation by the gear motor (M); and - a control unit (U) operatively connected to the gear motor (M) to start the gear motor (M) in order to move the winding shaft (A) or to stop the gear motor (M) in order to stop the winding shaft (A); wherein said control unit (U) is operatively connected to the magnetic detectors (63, 64) of the magnetic device (100) to receive a first magnetic field value (B1) detected by the first magnetic detector (63) and a second magnetic field value (B2) detected by the second magnetic detector (64); wherein said control unit (U) comprises computational means (U2) configured to calculate the position (FX) of the roller shutter (S) based on a combination of said magnetic field values (B1, B2).

9. The motorization assembly (G) according to claim 8, wherein said control unit (U) has a memory (U1) in which an upper limit position (FS) and a lower limit position (FI) of the roller shutter are stored; wherein said control unit (U) comprises check means (U3) configured to evaluate whether the position (FX) of the roller shutter (S) is inside the range between the upper limit position (FS) and the lower limit position (FI) or outside the range between the upper limit position (FS) and the lower limit position (FI).

10. The motorization assembly (G) according to claim 9, further comprising a control device (D) suitable for being used by a user and operatively connected to the control unit (U) in order to send an ascent command (c1) suitable for starting the gear motor (M) to rotate the winding shaft (A) in the winding direction, or a descent command (c2) suitable for starting the gear motor (M) to rotate the winding shaft (A) in the unwinding direction, or a stop command (c3) suitable for stopping the gear motor (M); wherein said check means (U3) of the control unit (U) are configured to check that: - every time the control unit (U) receives the ascent command (c1), the position (FX) of the roller shutter (S) does not go above the upper limit position (FS); and - every time the control unit (U) receives the descent command (c2), the position (FX) of the roller shutter (S) does not go below the lower limit position (FI).

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