A brake device for a tubular motor and a tubular motor

Abstract

The application provides a brake device for a tubular motor, and belongs to the field of tubular motors. The brake device comprises a shell, a magnetic conducting rotor for fixed connection with a motor shaft, a magnet and an external magnetic conductor for being located in a magnetic circuit of the magnet. The magnetic conducting rotor is a magnetic conductor. The magnet is located outside the magnetic conducting rotor and a gap exists between the magnet and the magnetic conducting rotor in the radial direction of the magnetic conducting rotor. The external magnetic conductor and the magnetic conducting rotor are both in magnetic connection with the magnet. The magnet is fixed relative to the shell. In addition, the application further discloses a tubular motor adopting the brake device. The application has the advantages that the brake torque can be enhanced and the braking effect can be improved by adopting the structure. The application is used for braking of the tubular motor.

Description

[Technical Field]

[0001] This invention relates to a braking device for a tubular motor and a tubular motor, belonging to the field of tubular motors. [Background Technology]

[0002] As a driving device, tubular motors are widely used in roller shutters, projection screens, and other fields. In order to ensure that roller shutters stop running and remain in the same position immediately when the power is cut off, to prevent the roller shutters from sliding down due to their own weight, and to eliminate the inaccurate positioning caused by the inertia of the rotor after high-speed rotation, a braking device needs to be installed in the tubular motor to improve the self-locking ability and safety of roller shutters.

[0003] Currently, tubular motors consist of a motor shaft and a motor housing. The braking structure of a tubular motor includes a magnet for fixing to the motor shaft and a magnetic conductor for fixing to the motor housing. The magnet and the magnetic conductor are magnetically connected. With this structure, braking can be achieved by generating braking torque through the magnetic force between the magnet and the magnetic conductor. However, the braking torque generated by the magnetic force between the magnet and the magnetic conductor is relatively small, resulting in poor braking effect. [Summary of the Invention]

[0004] The technical problem to be solved by the present invention is to provide a braking device for a tubular motor, which can enhance braking torque and improve braking effect.

[0005] To solve the above-mentioned technical problems, the present invention provides a braking device for a tubular motor, comprising a housing, a magnetically conductive rotor for fixed connection with the motor shaft, a magnet, and an external magnetically conductive body located in the magnetic circuit of the magnet. The magnetically conductive rotor is a magnetically conductive body, the magnet is located outside the magnetically conductive rotor, and there is a gap between the magnet and the magnetically conductive rotor along the radial direction of the magnetically conductive rotor. Both the external magnetically conductive body and the magnetically conductive rotor are magnetically connected to the magnet, and the magnet is fixed relative to the housing.

[0006] With the above structure, the braking device firstly includes a housing, a magnetically guided rotor for fixed connection with the motor shaft, a magnet, and an external magnetically guided body located in the magnetic circuit of the magnet. The magnetic circuit refers to a closed loop formed by a strong magnetic material that generates a magnetic field of a certain intensity, i.e., the path of the magnetic field lines in the magnetic field of the magnet. The magnetically guided rotor is a magnetically guided body, which allows the magnet to generate magnetic force with the magnetically guided rotor. The magnet is located outside the magnetically guided rotor, and there is a gap between the magnet and the magnetically guided rotor along the radial direction, allowing the magnetically guided rotor to rotate smoothly and generate magnetic force with the magnet. The radial direction refers to the direction perpendicular to the axial and circumferential directions of the magnetically guided rotor. The external magnetically guided body and the magnetically guided rotor are magnetically connected to the magnet. The magnetic connection refers to the connection method between two objects through magnetic force, i.e., there is a magnetic force between the magnet, the external magnetically guided body, and the magnetically guided rotor. The magnet is fixed relative to the housing, and the external magnetically guided body can be fixed relative to the housing through the magnetic connection with the magnet, thus enabling braking.

[0007] Based on the above structure, the magnetic force exerted by the magnet on the magnetically guided rotor generates a braking torque to impede the rotation of the motor shaft, thus achieving braking. When the external magnetic guide is located in the magnetic circuit of the magnet, the magnetic permeability of the external magnetic guide is much greater than that of air, which enhances the magnetic field strength generated by the magnet, thereby increasing the magnetic force between the magnet and the magnetically guided rotor. This enhances the braking torque exerted by the magnet on the magnetically guided rotor, further improving the braking effect. At the same time, it is not necessary to use more magnets to increase the magnetic field strength, thereby reducing costs and saving materials.

[0008] Based on the above structure, the magnet can magnetize the external magnetic conductor, so that the external magnetic conductor can generate a magnetic field and generate a magnetic force with the magnetic conductor rotor. This allows the external magnetic conductor to generate a braking torque on the magnetic conductor rotor, further hindering the rotation of the magnetic conductor rotor, thereby further increasing the braking torque and improving the braking effect.

[0009] Based on the above structure, the magnetic conductor can shield external electromagnetic fields, reduce the interference of external electromagnetic fields on the magnetic field generated by the magnet, and prevent the magnetic field generated by the magnet from being weakened due to interference from external electromagnetic fields. This ensures the magnitude of the magnetic force of the magnet on the magnetic conductor rotor and ensures that the braking device can have a good braking effect.

[0010] Preferably, the magnet is a magnetic ring and is coaxial with the magnetically conductive rotor, with the magnetically conductive rotor and the external magnetically conductive body located on opposite sides of the magnetic ring along the radial direction of the magnetically conductive rotor.

[0011] Preferably, the outer casing is provided with a snap-fit ​​structure for engaging the magnetic ring, and the external magnetic conductor is in direct contact with the magnetic ring.

[0012] Preferably, there is a gap between the magnetic ring and the external magnetic conductor along its radial direction.

[0013] Preferably, the magnetic rotor has at least two bosses along the circumferential direction, and the at least two bosses are evenly distributed along the circumferential direction.

[0014] Preferably, the external magnetic conductor is ring-shaped and its axis is coaxial with the magnetic rotor. The external magnetic conductor is sleeved on the outside of the magnetic ring, and the magnetic rotor is sleeved on the inside of the magnetic ring.

[0015] Preferably, one of the outer shells or magnetic rings is provided with a protrusion for circumferential positioning of the magnetic ring, and the other is provided with a groove for engaging with the protrusion. The protrusion and the groove are slidably connected, and the protrusion and the groove engage with each other by relative sliding.

[0016] Preferably, the housing is provided with an arc-shaped mounting plate, the protrusion is located on the arc-shaped mounting plate, and the external magnetic conductor is located between the arc-shaped mounting plate and the housing, and its two sides along the radial direction of the magnetic rotor are in contact with the outer surface of the mounting plate and the inner surface of the housing, respectively.

[0017] Preferably, the magnet is a bar magnet and includes at least two bar magnets, which are evenly distributed along the circumferential direction of the motor shaft.

[0018] The present invention also discloses a tubular motor, including a motor, a motor shaft and a braking device, wherein the braking device is a braking device for a tubular motor as described in any of the above embodiments.

[0019] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and accompanying drawings. [Attached Image Description]

[0020] The present invention will now be described in further detail with reference to the accompanying drawings, wherein:

[0021] Figure 1 This is a schematic diagram of the braking device in Embodiment 1;

[0022] Figure 2 This is a schematic diagram of the outer casing of the braking device in Embodiment 1;

[0023] Figure 3 This is a schematic diagram of the magnetic rotor in the braking device of Embodiment 1;

[0024] Figure 4 This is a schematic diagram of the magnetic ring in the braking device of Embodiment 1;

[0025] Figure 5 This is a schematic diagram of the external magnetic conductor in the braking device of Embodiment 1;

[0026] Figure 6 This is a top view of the braking device in Embodiment 1;

[0027] Figure 7 This is a schematic diagram of the tubular motor in Example 4. 【Detailed Implementation Methods】

[0028] The technical solutions of the embodiments of the present invention will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of the present invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of the present invention.

[0029] In the following description, terms such as “inner,” “outer,” “upper,” “lower,” “left,” and “right” that indicate orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings and are used only for the convenience of describing embodiments and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0030] Example 1:

[0031] like Figures 1 to 6 As shown, the preferred structure of the braking device for the tubular motor in this embodiment includes a housing 1, a magnetically conductive rotor 3 for fixed connection with the motor shaft 2, a magnet 4, and an external magnetically conductive body 5 located in the magnetic circuit of the magnet 4. The magnetically conductive rotor 3 is the magnetically conductive body 4, and the magnet 4 is located outside the magnetically conductive rotor 3. There is a gap between the magnet and the magnetically conductive rotor 3 along the radial direction of the magnetically conductive rotor 3. The external magnetically conductive body 5 and the magnetically conductive rotor 3 are magnetically connected to the magnet 4. The magnet 4 is fixed relative to the housing 1.

[0032] With the above structure, the braking device first includes a housing 1, a magnetic rotor 3 for fixed connection with the motor shaft 2, a magnet 4, and an external magnetic conductor 5 located in the magnetic circuit of the magnet 4. The magnetic circuit refers to a closed loop formed by strong magnetic material that generates a magnetic field of a certain intensity, i.e., the path of the magnetic field lines in the magnetic field of the magnet 4. In this invention, the magnetic circuit can usually be formed inside the housing 1 and outside the magnet 4. The magnetic rotor 3 is the magnetic conductor 4, so that the magnet 4 can generate magnetic force with the magnetic rotor 3. The magnet 4 is located outside the magnetic rotor 3, and there is a gap between the magnet and the magnetic rotor 3 along the radial direction of the magnetic rotor 3, so that the magnetic rotor 3 can rotate smoothly and generate magnetic force with the magnet 4. The magnetic force acts as a guide, where the radial direction refers to the direction perpendicular to the axial and circumferential directions of the magnetic rotor 3. Both the external magnetic guide 5 and the magnetic rotor 3 are magnetically connected to the magnet 4. The magnet 4 is fixed relative to the outer shell 1. The external magnetic guide 5 can be fixed relative to the outer shell 1 through the magnetic connection with the magnet 4, thus enabling braking. The magnetic connection refers to the connection between two objects through magnetic force, that is, there is a magnetic force between the magnet 4 and the external magnetic guide 6 and the magnetic rotor 3. The outer shell 1 can be the outer shell of the motor 6, or it can be the outer shell of the braking device, which is separate from the outer shell of the motor 6. The outer shell 1 is the outer shell of the braking device. In this embodiment, the outer shell preferably refers to the outer shell of the braking device.

[0033] Based on the above structure, the magnetic force exerted by the magnet 4 on the magnetic rotor 3 generates a braking torque to impede the rotation of the motor shaft 2, thus achieving braking. When the external magnetic conductor 5 is located in the magnetic circuit of the magnet 4, the magnetic permeability of the external magnetic conductor 5 is much greater than that of air, which enhances the magnetic field strength generated by the magnet 4, thereby increasing the magnetic force between the magnet 4 and the magnetic rotor 3. This enhances the braking torque of the magnet 4 on the magnetic rotor 3, further improving the braking effect. At the same time, it is not necessary to use more magnets to increase the magnetic field strength, thereby reducing costs and saving materials.

[0034] Based on the above structure, the magnet 4 can magnetize the external magnetic conductor 5, so that the external magnetic conductor 5 can generate a magnetic field and generate a magnetic force with the magnetic conductor rotor 3, so that the external magnetic conductor 5 can generate a braking torque on the magnetic conductor rotor 3 to further hinder the rotation of the magnetic conductor rotor 3, thereby further increasing the braking torque and improving the braking effect.

[0035] Based on the above structure, the magnetic conductor 4 can shield external electromagnetic fields, reduce the interference of external electromagnetic fields on the magnetic field generated by the magnet 4, and prevent the magnetic field generated by the magnet 4 from being weakened due to interference from external electromagnetic fields. This ensures the magnitude of the magnetic force of the magnet 4 on the magnetic rotor 3 and ensures that the braking device can have a good braking effect.

[0036] Furthermore, the magnetic field lines of magnet 4 move from one magnetic pole to another to form a magnetic field. When the magnetic field lines flow through the air, the low permeability of the air hinders their movement, thus reducing the magnetic field strength of magnet 4. However, by adding an external magnetic conductor 5 with higher permeability, the magnetic field lines can pass through the magnetic conductor 4 when moving from one magnetic pole to another, making their movement smoother and reducing the obstruction. This increases the magnetic field strength of magnet 4, thereby increasing the torsional torque during braking.

[0037] To optimize the structure, in this embodiment, the magnet 4 is preferably a magnetic ring and coaxial with the magnetic rotor 3. The magnetic rotor 3 and the external magnetic conductor 5 are respectively located on both sides of the magnetic ring along the radial direction of the magnetic rotor 3. When the magnet 4 is a magnetic ring, the magnetic rotor 3 can be subjected to the magnetic force of the magnet 4 to generate braking torque around its circumference, thus improving the braking effect of the braking device. At this time, the external magnetic conductor 5 is located outside the magnetic ring along the radial direction of the magnetic rotor 3, which means it is located in the magnetic circuit of the magnetic ring. This allows the magnetic rotor 3 and the external magnetic conductor 5 to be respectively fitted inside and outside the magnetic ring, thereby optimizing the structure and making the installation of the braking device more convenient. The magnetic rotor 3 can be symmetrically provided with multiple protrusions 9 along its radial direction, so that the magnet 4 can generate braking torque through the magnetic force between itself and the protrusions 9. The magnetic ring and coaxiality with the magnetic rotor 3 can make the force on the magnetic rotor 3 more uniform during braking, making braking more stable and convenient.

[0038] In order to optimize the structure of the outer shell 1, in this embodiment, it is preferable that there is a gap between the magnetic ring and the external magnetic conductor 5 along its radial direction. The gap makes it easier to install both the magnetic ring and the external magnetic conductor 5. At the same time, when fixing the magnetic ring, a fixing device needs to be installed around it. The gap between the magnetic ring and the external magnetic conductor 5 can leave a position for the fixing device to be installed and fixed, thereby optimizing the structure of the outer shell 1.

[0039] To optimize the structure of the magnetic rotor 3, this embodiment preferably provides at least two protrusions along the circumferential direction, and the at least two protrusions are evenly distributed along the circumferential direction. Since the protrusions are closer to the magnet 4, the magnetic interaction between the magnet 4 and the magnetic rotor 3 is mainly the magnetic interaction between the magnet 4 and the protrusions. By concentrating the magnetic force through the protrusions, the magnetic force emanating from the protrusions is larger. When the magnetic rotor 3 continues to rotate due to inertia or external force, the magnetic force between the protrusions and the magnet 4 can stop the movement of the magnetic rotor 3, thus making the braking more obvious.

[0040] To optimize the structure of the external magnetic conductor 5, in this embodiment, the external magnetic conductor 5 is preferably annular and its axis is coaxial with that of the magnetic rotor 3. The external magnetic conductor 5 is sleeved on the outside of the magnetic ring, and the magnetic rotor 3 is sleeved on the inside of the magnetic ring. Since the closed magnetic field lines of the magnetic ring are around the cross-section of the magnetic ring, that is, there is a magnetic circuit around the outside of the magnetic ring, and the external magnetic conductor 5 is annular, it can be placed on the outside of the magnetic ring and is located in the magnetic circuit of the magnetic ring. This eliminates the need to find a suitable position for the external magnetic conductor 5 to be placed in the magnetic circuit of the magnet 4, which would make installation inconvenient. During installation, it can be sleeved on the outside of the magnetic ring. At the same time, the external magnetic conductor 5 can be located in all magnetic circuits along the circumferential direction of the magnetic ring, which can fully increase the magnetic field strength of the magnet 4.

[0041] To enable circumferential positioning of the magnetic ring and facilitate installation, this embodiment preferably provides a protrusion 9 on one of the outer shell 1 or the magnetic ring for circumferential positioning of the magnetic ring, and a groove 10 on the other for engaging with the protrusion 9. The protrusion 9 and the groove 10 are slidably connected, and the protrusion 9 and the groove 10 engage with each other by relative sliding. With this structure, the magnetic ring can be circumferentially positioned and is very easy to install.

[0042] To further optimize the structure of the outer shell 1, in this embodiment, the outer shell 1 is preferably provided with an arc-shaped mounting plate 8. The protrusion 9 is located on the arc-shaped mounting plate 8. The external magnetic conductor 5 is located between the arc-shaped mounting plate 8 and the outer shell 1, and its two sides along the radial direction of the magnetic conductor rotor 3 are in contact with the outer surface of the mounting plate and the inner surface of the outer shell 1, respectively. There are multiple arc-shaped mounting plates 8, which are evenly distributed in the circumferential direction, so that the circumferential positioning of the magnet 4 is more firm and the external magnetic conductor 5 is prevented from shaking, making the external magnetic conductor 5 more stable.

[0043] Example 2:

[0044] The difference between this embodiment and Embodiment 1 is that in this embodiment, the external magnetic conductor 5 is in direct contact with the magnetic ring. The closer the external magnetic conductor 5 is to the magnet 4, the stronger the magnetic field. With this structure, the contact between the external magnetic conductor 5 and the magnet 4 can maximize the magnetic field strength of the magnet 4, resulting in a greater torsional torque during braking. This embodiment can also achieve the technical effect of Embodiment 1.

[0045] Example 3:

[0046] The difference between this embodiment and Embodiment 1 is that in this embodiment, the magnet 4 is a bar magnet and includes at least two bar magnets. The at least two bar magnets are evenly distributed along the circumferential direction of the motor shaft. This embodiment can also achieve the technical effect of Embodiment 1.

[0047] Example 4:

[0048] This embodiment discloses a tubular motor, such as Figure 7 As shown, this embodiment mainly includes a motor 6, a motor shaft 2, and a braking device. The braking device described in this embodiment adopts the braking device for a tubular motor of Embodiment 1 or Embodiment 2 or an equivalent implementation thereof.

[0049] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of the present invention will be included within the scope of the claims.

Claims

1. A braking device for a tubular motor, characterized in that: The device includes a housing, a magnetically guided rotor for fixed connection with a motor shaft, a magnet, and an external magnetically guided body located in the magnetic circuit of the magnet. The magnetically guided rotor is a magnetically guided body located outside the magnetically guided rotor, with a gap between the magnet and the magnetically guided rotor along the radial direction. Both the external magnetically guided body and the magnetically guided rotor are magnetically connected to the magnet, and the magnet is fixed relative to the housing. The magnet is a magnetic ring and coaxial with the magnetically guided rotor. The magnetically guided rotor and the external magnetically guided body are located on opposite sides of the magnetic ring along the radial direction of the magnetically guided rotor. The external magnetically guided body is annular, and its axis is coaxial with the magnetically guided rotor. The external magnetically guided body is sleeved outside the magnetic ring, and the magnetically guided rotor is sleeved inside the magnetic ring. The external magnetically guided body enhances the magnetic field strength of the magnet by guiding the magnetic field lines of the magnet. The external magnetically guided body is fixed relative to the housing through a magnetic connection with the magnet.

2. A braking device for a tubular motor according to claim 1, characterized in that: The external magnetic conductor is in direct contact with the magnetic ring.

3. A braking device for a tubular motor according to claim 1, characterized in that: There is a gap between the magnetic ring and the external magnetic conductor along its radial direction.

4. A braking device for a tubular motor according to claim 1, characterized in that: The magnetic rotor is provided with at least two protrusions along the circumferential direction, and the at least two protrusions are evenly distributed along the circumferential direction.

5. A braking device for a tubular motor according to claim 1, characterized in that: One of the outer shells or magnetic rings is provided with a protrusion for circumferential positioning of the magnetic ring, and the other is provided with a groove for engaging with the protrusion. The protrusion and the groove are slidably connected, and the protrusion and the groove engage with each other by relative sliding.

6. A braking device for a tubular motor according to claim 5, characterized in that: The outer casing is provided with an arc-shaped mounting plate, the protrusion is located on the arc-shaped mounting plate, and the external magnetic conductor is located between the arc-shaped mounting plate and the outer casing, and its two sides along the radial direction of the magnetic conductor rotor are in contact with the outer surface of the mounting plate and the inner surface of the outer casing, respectively.

7. A tubular motor, comprising a motor, a motor shaft, and a braking device, characterized in that: The braking device is the same as any one of the braking devices for tubular motors as described in any one of claims 1 to 6.

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