Roller shutter equipment, motor and brake device

Abstract

The utility model discloses roller shutter equipment, a motor and a brake device, the brake device is used for braking of a motor rotor, the brake device comprises a permanent magnet and a magnetic conductive member, one of the permanent magnet and the magnetic conductive member is used for connecting the motor rotor, and the other one is used for connecting a motor stator; the permanent magnet comprises N magnetic poles, the magnetic conductive piece comprises N tooth grooves which are arranged at intervals in the circumferential direction, the brake device forms an N-pole N-groove structure, N is an integer larger than 1, and when the brake device is applied to the motor and the roller shutter equipment, the motor can be braked quickly, and meanwhile, the brake efficiency is improved. The vibration frequency of the motor can be effectively reduced so as to avoid the vibration frequency of a housing of the roller shutter equipment, resonance is avoided, normal operation of the motor is guaranteed, and noise of the motor in the operation process is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of rolling curtain equipment, and in particular to a rolling curtain motor and a brake device thereof. Background Art

[0002] As a device for converting electrical energy into mechanical energy, motors are widely used in our lives, such as in automobiles, refrigerators, air conditioners, fans, rolling shutters and windows, etc.

[0003] When the motor is used as the drive of the rolling shutter door and window, a brake device needs to be configured to ensure that the curtain can immediately stop running and stay in the position when the power is cut off, eliminating the problem of the curtain continuing to rotate and positioning inaccurately caused by the inertia of the motor rotor after high-speed rotation. In the existing structure, the brake device usually adopts a mechanical brake device such as a brake pad friction brake, which has problems such as complex brake device structure, difficult assembly, and high noise. Utility Model Content

[0004] In view of this, the purpose of the present application is to provide a braking device capable of reducing noise generation, a motor using the braking device, and a roller shutter device using the motor.

[0005] On the one hand, the present application provides a braking device for braking a motor rotor, the braking device comprising a permanent magnet and a magnetic conductive member, wherein one of the permanent magnet and the magnetic conductive member is used to connect to the motor rotor, and the other of the permanent magnet and the magnetic conductive member is used to connect to the motor stator; the permanent magnet comprises N magnetic poles, the magnetic conductive member comprises N tooth slots spaced apart in the circumferential direction, and the braking device constitutes an N-pole N-slot structure, wherein N is an integer greater than 1.

[0006] In some embodiments, the permanent magnet is used to connect to the motor rotor, the magnetic conductive member is used to connect to the motor stator, and the magnetic conductive member is arranged around the permanent magnet.

[0007] In some embodiments, the brake device is a 2-pole 2-slot structure, a long strip of space is provided in the magnetic conductive component, the permanent magnet is installed in the middle of the space, and two ends of the space respectively form two tooth slots.

[0008] In some embodiments, the space is runway-shaped, and the inner wall surface of the magnetic conductive part surrounding the space includes two planes located on opposite sides of the permanent magnet and two curved surfaces respectively connected between the two ends of the two planes, the length of the plane is greater than the outer diameter of the permanent magnet, and the two tooth grooves are formed at the positions of the two curved surfaces.

[0009] In some embodiments, the middle portion of each of the planes is recessed to form an arc surface, and the arc surface is gap-matched with the outer peripheral surface of the permanent magnet to form an air gap.

[0010] In some embodiments, the arc surface is coaxially arranged with the outer peripheral surface of the permanent magnet, and the air gap is a uniform air gap with a constant width in the circumferential direction.

[0011] In some embodiments, the brake device is a 2-pole 2-slot structure, and the magnetic conductive part includes two magnetic conductive parts symmetrically arranged on opposite sides of the permanent magnet, each of the magnetic conductive parts is cylindrical, and the axis of the magnetic conductive part is parallel to the motor shaft.

[0012] In some embodiments, the braking device is an N-pole N-slot structure, where N is an integer greater than 2; the permanent magnet is fixed on the motor stator, and includes N magnetic poles arranged along the circumferential direction; the magnetic conductive part includes a connecting part fixed on the motor shaft and N magnetic conductive parts extending radially outward from the connecting part, and the N magnetic conductive parts are spaced apart in the circumferential direction to form N tooth slots.

[0013] In some embodiments, each of the magnetic conductive portions is substantially fan-shaped, and each of the tooth grooves is substantially U-shaped.

[0014] In some embodiments, the magnetic conductive member is made of a whole piece of magnetic conductive material or is formed by stacking a plurality of silicon steel sheets.

[0015] In some embodiments, a shell base is further included for mounting the magnetic conductive component, wherein one of the inner wall of the shell base and the outer wall of the magnetic conductive component is provided with a protrusion, and the other one is provided with a groove, and the protrusion is embedded in the groove to fix the shell base and the magnetic conductive component.

[0016] In some embodiments, a shell base is further included for mounting the magnetic conductive component, the shell base is fixedly connected to the motor stator, and the connection position between the shell base and the motor stator is staggered with the connection position between the shell base and the magnetic conductive component.

[0017] In some embodiments, the permanent magnet is annular and fixedly mounted on a sleeve; the motor rotor includes a rotating shaft, and the sleeve is fixedly mounted on the rotating shaft.

[0018] On the other hand, the present application also provides a motor, comprising a stator, a rotor rotatable relative to the stator, and the above-mentioned braking device.

[0019] In some embodiments, the electronic rotor is further connected to a positioning magnetic ring, and the positioning magnetic ring and the brake device are respectively arranged at opposite ends of the motor rotor.

[0020] On the other hand, the present application also provides a rolling curtain device, including a cover shell, the above-mentioned motor arranged in the cover shell, and a curtain driven by the motor.

[0021] In some embodiments, the motor is a tubular motor and the self-locking frequency of the brake device is lower than 200 Hz.

[0022] Compared with the prior art, the braking device provided in the present application adopts a magnetic brake, which is an N-pole N-slot structure as a whole. It has a simple structure and is easy to assemble. While achieving rapid braking, it can effectively reduce the vibration frequency of the motor to avoid the vibration frequency of the cover of the rolling shutter equipment, avoid the generation of resonance, ensure the normal operation of the motor and reduce the noise of the motor during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 FIG. 1 is a schematic diagram of an embodiment of a motor of the present application.

[0024] Figure 2 for Figure 1 Exploded view of the motor shown.

[0025] Figure 3 for Figure 1 Another exploded view of the motor shown.

[0026] Figure 4 for Figure 1 Further exploded view of the brake assembly of the motor shown.

[0027] Figure 4a for Figure 4 Another angle view of .

[0028] Figure 5 for Figure 4 A plan view of the brake assembly shown.

[0029] Figure 5a for Figure 4 A plan view of the magnetic conductive member and permanent magnet of the brake device shown.

[0030] Figure 6 FIG. 1 is a schematic diagram of another embodiment of the motor of the present application.

[0031] Figure 7 for Figure 6 Exploded view of the motor shown.

[0032] Figure 8 for Figure 6 Further exploded view of the brake assembly of the motor shown.

[0033] Fig. 9 for Figure 8 A plan view of the brake assembly shown.

[0034] Figure 9a for Figure 8 A simplified schematic diagram of the brake assembly shown.

[0035] Fig.10 This is a schematic diagram of another embodiment of the motor of the present application.

[0036] Fig.11 This is a schematic diagram of another embodiment of the brake device of the present application.

[0037] Fig.12 This is a schematic diagram of yet another embodiment of the brake device of the present application.

[0038] Fig.13 for Fig.12 A plan view of the brake assembly shown. DETAILED DESCRIPTION

[0039] In order to facilitate the understanding of the present application, the present application will be described more comprehensively below with reference to the relevant drawings. One or more embodiments of the present application are exemplarily given in the drawings to make the understanding of the technical solution disclosed in the present application more accurate and thorough. However, it should be understood that the present application can be implemented in a variety of different forms and is not limited to the embodiments described below.

[0040] The present application provides a motor, in particular, a tubular motor, which is preferably used in rolling shutter equipment, such as rolling shutter doors, rolling shutter windows, projectors and other products. Figure 1-3 The figure shows a specific embodiment of the motor of the present application, wherein the motor comprises a stator 20, a rotor 30 that can rotate relative to the stator 20, and a brake device 40. In the present embodiment, the rotor 30 is rotatably arranged at the center of the stator 20, and constitutes an inner rotor motor as a whole. The brake device 40 is used for braking the rotor 30 of the motor to prevent the rotor 30 from continuing to rotate under the action of inertia after the motor is powered off, or the load (such as a rolling curtain, a curtain, etc.) from sliding down due to its own heavy weight.

[0041] The stator 20 includes a stator shell 22 and a plurality of stator poles 24 attached to the inner wall of the stator shell 22. The stator poles 24 form alternating N poles and S poles in the circumferential direction of the stator shell 22. Preferably, the stator shell 22 is a cylindrical structure with one end closed and one end open, which can facilitate the assembly of the rotor 30 and the like. The rotor 30 includes a rotating shaft 32, an iron core 34 arranged around the rotating shaft 32, and a coil 36 wound around the iron core 34. The end of the rotating shaft 32 extends outward from the center of the stator shell 22 for connecting a brake device 40, a load, etc. When the motor is started, the coil 36 of the rotor 30 is energized to generate a periodically changing magnetic field, which interacts with the magnetic field of the stator 20 to drive the rotor 30 to rotate relative to the stator 20, thereby driving the load connected thereto, such as a curtain, to be retracted and released.

[0042] In this embodiment, a commutator 38 is also provided on the rotating shaft 32 of the rotor 30. The commutator 38 includes a plurality of commutator segments arranged at intervals along the circumferential direction of the rotating shaft 32, and the commutator segments are connected to the coils 36 of the rotor 30. The stator 20 also includes a carbon brush 26, and the carbon brush 26 elastically abuts against the commutator 38. During the rotation of the rotor 30 relative to the stator 20, each commutator segment sequentially contacts / separates from the carbon brush 26, so that the corresponding coils 36 are energized / disconnected sequentially, thereby generating a periodically changing magnetic field. In the illustrated embodiment, the open end of the stator housing 22 is covered with an end cover 28, and the carbon brush 26 is arranged in the end cover 28 and has a terminal 29 extending outward from the end cover 28, which is used to connect an external power source to power the coils 36.

[0043] Please also see Figure 4 , Figure 4a The brake device 40 includes a housing 42, a magnetic conductive member 44 fixedly disposed in the housing 42, and a permanent magnet 46 rotatably disposed in the magnetic conductive member 44. The housing 42 is generally in a cylindrical structure, and its outer diameter is equivalent to the outer diameter of the stator housing 22. Specifically, the housing 42 includes a bottom plate 421 and a side plate 423 disposed around the bottom plate, and the two together enclose a space for installing the magnetic conductive member 44 and the permanent magnet 46. A through hole 425 is provided in the center of the bottom plate 421 for passing the rotating shaft 32 of the rotor 30. One end of the rotating shaft 32 extends into the housing 42 and is connected to the permanent magnet 46. The two can be fixed together by tight fit, bonding, welding, etc., so that the permanent magnet 46 can rotate synchronously with the rotating shaft 32.

[0044] like Figure 2 , Figure 3 As shown, the closed end of the stator shell 22 is provided with a fixing hole 29, and a fixing member 50, such as a screw, passes through the bottom plate 421 of the shell seat 42 and is screwed into the fixing hole 29 of the stator shell 22, connecting the shell seat 42 to the outer side of the closed end of the stator shell 22. Afterwards, the magnetic conductive member 44 and the permanent magnet 46 are assembled into the shell seat 42, wherein the permanent magnet 46 is sleeved on the rotating shaft 32 and faces the magnetic conductive member 44, and the assembly of the brake device 40 is completed. In some embodiments, the shell seat 42 and the stator shell 22 can also be connected together by means of snap fasteners, etc., and can even be an integrated structure. After assembly, the motor as a whole constitutes a tubular motor, which can be conveniently arranged in the cover of the rolling shutter device.

[0045] The magnetic conductive member 44 is made of a magnetic conductive material, such as but not limited to pure iron, magnetic conductive stainless steel, low carbon steel, etc. In some embodiments, the magnetic conductive member 44 is an iron block; in some embodiments, the magnetic conductive member 44 is formed by stacking a number of silicon steel sheets, and is cylindrical in shape as a whole. In the illustrated embodiment, a groove 441 is provided on the outer wall of the magnetic conductive member 44, and a protrusion 427 is formed on the inner wall of the shell seat 42, and the protrusion 427 is embedded in the groove 441 to position the magnetic conductive member 44 in the shell seat 42. In other embodiments, a groove may be provided on the shell seat 42, and a protrusion may be provided on the magnetic conductive member 44, and the concave and convex parts may also cooperate to realize the installation and positioning of the magnetic conductive member 44. Of course, the magnetic conductive member 44 and the shell seat 42 may also be combined in other ways or several ways, such as snapping, bonding, welding, etc. for connection and positioning.

[0046] The permanent magnet 46 is made of permanent magnetic material, such as NdFeB, ferrite, etc., and is generally in the shape of a circular column, with an assembly hole 47 in the center. After being assembled with the motor, the permanent magnet 46 is fixedly sleeved on the rotating shaft 32 through its assembly hole 47 and rotatably arranged in the center of the magnetic conductive member 44. In this embodiment, the brake device 40 is generally constructed as a 2-pole 2-slot structure, wherein the permanent magnet 46 includes two magnetic poles N and S arranged oppositely, each magnetic pole is roughly in the shape of a semicircular ring, Figure 5 , Figure 5a The dotted line in the figure indicates the position of the interface of the N and S poles of the permanent magnet 46; a space 443 is provided in the magnetic conductive member 44, and the space 443 is generally a long strip structure, and its width is slightly larger than the outer diameter of the permanent magnet 46, and its length is much larger than the outer diameter of the permanent magnet 46. The middle part of the space 443 is used as the assembly space of the permanent magnet 46, and the two ends constitute two tooth grooves of the magnetic conductive member 44 respectively.

[0047] In a specific implementation, Figure 5a As shown, the space 443 is roughly a runway-type structure, and the inner wall of the magnetic conductive member 44 includes two planes 445 and two curved surfaces 447 arranged opposite to each other. The interval width of the two planes 445 is slightly larger than the outer diameter of the permanent magnet 46, and the length of each plane 445 is much larger than the outer diameter of the permanent magnet 46; the two curved surfaces 447 are respectively connected between the two ends of the two planes 445, and the diameter of the curved surface 447 is preferably not less than the outer diameter of the permanent magnet 46. After assembly, the two planes 445 are respectively located on the opposite sides of the permanent magnet 46 and are gap-matched with the permanent magnet 46. The two curved surfaces 447 are spaced a large distance from the outer circumference of the permanent magnet 46, and the interval constitutes two tooth grooves of the magnetic conductive member 44. The magnetic conductive member 44 forms two magnetic conductive parts with the two tooth grooves as the boundary, and each magnetic conductive part interacts with one magnetic pole of the permanent magnet 46.

[0048] The middle position of each plane 445 of the magnetic conductive member 44 is further recessed to form an arc surface 449, and the arc surface 449 is gap-matched with the outer peripheral surface of the permanent magnet 46. Preferably, the arc surface 449 and the outer peripheral surface of the permanent magnet 46 are coaxially arranged annular surfaces, and a uniform air gap of constant size is formed between the two to further reduce the noise during the operation of the motor. When not affected by external forces, the centers of the two magnetic poles of the permanent magnet 46 are located at the minimum air gap position, that is, the centers of the two magnetic poles of the permanent magnet 46 are respectively opposite to the middle positions of the two planes 445 of the magnetic conductive member 44, that is, opposite to the arc surface 449, as shown in FIG. Figure 5 In this position, the magnetic attraction between the permanent magnet 46 and the magnetic conductive member 44 is the strongest.

[0049] When the motor is powered on, the magnetic fields of the stator 20 and the rotor 30 interact with each other to rotate the rotor 30, overcoming the magnetic attraction between the magnetic member 44 and the permanent magnet 46 so that the permanent magnet 46 can rotate synchronously with the rotating shaft 32 of the rotor 30. When the motor is powered off, the rotor 30 has a tendency to continue to rotate due to rotational inertia. At this time, due to the magnetic attraction between the magnetic member 44 and the permanent magnet 46, the permanent magnet 46 and the rotor 30 connected thereto can be attracted and positioned, overcome the rotational inertia and stop rotating immediately, and then the driven load can stop running immediately, realizing the braking of the rotor 30. It should be understood that after the motor is powered off, the rotor 30 may rotate a small angle so that the center of the magnetic pole of the permanent magnet 46 rotates to the minimum air gap position, which basically does not cause the load to continue to rotate.

[0050] When the above motor is applied to a rolling curtain device, the motor is installed in the housing of the device, and its shaft 32 is connected to the curtain transmission. After the motor is started, its shaft 30 drives the curtain to move to realize the release / retraction of the curtain. When the curtain moves to the desired position, the motor is turned off. At this time, through the setting of the brake device 40, the shaft 32 of the motor can stop rotating immediately, and the curtain is kept in the desired position, so that the position of the curtain can be accurately adjusted. Moreover, in this embodiment, the brake device 40 is designed as a 2-pole 2-slot structure, and its commutation peak is second order, which can reduce the self-locking frequency of the motor brake device (i.e., 2*(motor speed / 60)) to less than 200Hz, thereby avoiding the vibration frequency of the housing (usually above 200Hz), avoiding the generation of resonance, ensuring the normal operation of the motor and reducing the noise of the motor during operation, and improving the user experience. Moreover, the magnetic attraction can also effectively prevent the rolling curtain or curtain from sliding down due to its heavy weight.

[0051] Figure 6-8FIG. 4 is another embodiment of the motor of the present application, which is different from the previous embodiment mainly in the brake device 40. In this embodiment, the brake device 40 also includes a housing 42 and a magnetic conductive member 44 and a permanent magnet 46 assembled in the housing 42. The magnetic conductive member 44 is no longer an integral annular structure, but is composed of two separate magnetic conductive parts 44a and 44b, and two virtual tooth slots 45 are formed between the two magnetic conductive parts 44a and 44b, as shown in FIG. Fig. 9 , Figure 9a Specifically, the two magnetic conductive parts 44a, 44b can be cylindrical structures, and the axis of each magnetic conductive part 44a, 44b is parallel to the axis of the motor shaft 32 and the axis of the permanent magnet 46, so that a non-uniform air gap is formed between the magnetic conductive parts 44a, 44b and the corresponding magnetic poles of the permanent magnet 46.

[0052] In this embodiment, the shell base 42 is provided with two mounting portions 429 corresponding to the two magnetic conductive portions 44a and 44b, respectively. The shapes and sizes of the two mounting portions 429 match the two magnetic conductive portions 44a and 44b, and each magnetic conductive portion 44a and 44b can be fixed in a corresponding mounting portion 429 by tight fit or bonding. In some embodiments, the shell base 42 can be formed by overmolding, and the magnetic conductive portions 44a and 44b are placed in the mold in advance when the shell base 42 is formed, so that the mounting portion 429 of the shell base 42 can fix the magnetic conductive portions 44a and 44b as a whole after forming, further simplifying the assembly process.

[0053] Preferably, if Fig. 9 As shown, the assembly position of the fixing member 50 and the housing base 42 is staggered with the position of the mounting portion 429, so that the assembly of the housing base 42 and the stator housing 22 does not affect the assembly of the housing base 42 and the magnetic conductive portions 44a, 44b. During assembly, the housing base 42 and the stator housing 22 can be assembled first by the fixing member 50, and then the magnetic conductive portions 44a, 44b and the housing 42 can be assembled. Alternatively, the magnetic conductive portions 44a, 44b can be pre-assembled into the mounting portion 429 of the housing 42, and then the housing base 42 and the stator housing 22 can be assembled by the fixing member 50. Another method is as follows Figure 9a As shown, the assembly position of the fixing member 50 and the housing seat 42 coincides with the position of the mounting portion 429 , and the housing seat 42 and the stator housing 22 must be assembled first and then the magnetic conductive portions 44 a , 44 b and the housing 42 must be assembled. Fig. 9 The assembly method of the structure shown is relative to Figure 9a The assembly method of the structure shown is easier to operate and is conducive to improving production efficiency.

[0054] In this embodiment, the inner diameter of the permanent magnet 46 is larger than the diameter of the rotating shaft 32, and a sleeve 52 is provided between the permanent magnet 46 and the rotating shaft 32. The sleeve 52 can be made of plastic, metal, etc. During assembly, the permanent magnet 46 can be sleeved onto the sleeve 52 first, and the two can be fixed by tight fit, adhesive fixation, etc.; then the sleeve 52 is sleeved onto the rotating shaft 32 to complete the assembly of the permanent magnet 46 and the rotating shaft 32. Generally, the annular permanent magnet 46 is relatively brittle, and it is easy to crack when it is directly sleeved onto the rotating shaft 32. The permanent magnet 46 is assembled through the sleeve 52, which can effectively avoid the cracking problem of the permanent magnet 46 during the assembly process.

[0055] After assembly, the two magnetic conductive parts 44a, 44b are symmetrically arranged on opposite sides of the permanent magnet 46 and spaced therefrom. When the motor is powered off, the rotor 30 is braked by the attraction between the two magnetic poles of the permanent magnet 46 and the two magnetic conductive parts 44a, 44b.

[0056] Fig.10 Another embodiment of the motor of the present application is shown, and its structure is basically the same as the previous embodiment. The difference is that the motor of this embodiment is also provided with a positioning magnetic ring 54 and a sensor (not shown), wherein the sensor is preferably a Hall sensor, which senses the rotation speed and position of the motor by sensing the change of the magnetic field of the positioning magnetic ring 54. Specifically, the positioning magnetic ring 54 is fixedly sleeved on the rotating shaft 32 of the rotor 30 to rotate synchronously therewith. Preferably, the positioning magnetic ring 54 and the brake device 40 are respectively arranged at opposite ends of the rotating shaft 32. Preferably, a sleeve 55 is provided inside the positioning magnetic ring 54, and the sleeve 55 is assembled with the rotating shaft 32, which can effectively avoid the problem of cracking of the positioning magnetic ring 54 during the assembly process.

[0057] The structure, function, effect, etc. of the brake device 40 of the present application are described above by taking a 2-pole 2-slot structure as an example. In some embodiments, the number of slots and poles of the brake device 40 can be adaptively adjusted as needed.

[0058] Fig.11 In the illustrated embodiment, the brake device 40 is constructed as a 3-pole 3-slot structure as a whole, that is, the permanent magnet 46 includes three magnetic poles 46a, 46b, 46c, and the three magnetic poles 46a, 46b, 46c are preferably fixed to the housing 42 or the motor stator 20 and are arranged at intervals in the circumferential direction; the magnetic conductive member 44 is sleeved with the rotating shaft 32 of the motor rotor 30, and includes a connecting portion 440 fixed to the rotating shaft 32 and three magnetic conductive portions 44a, 44b, 44c extending radially outward from the connecting portion 440, and the three magnetic conductive portions 44a, 44b, 44c are arranged at intervals in the circumferential direction to form three tooth slots 45. In this embodiment, each magnetic conductive portion 44a, 44b, 44c is roughly in the shape of a strip extending in the radial direction, and the tooth slot 45 is roughly in the shape of a fan ring.

[0059] During braking, each magnetic pole 46a, 46b, 46c of the permanent magnet 46 faces one of the magnetic conductive parts 44a, 44b, 44c to generate magnetic attraction. The brake device 40 of this embodiment can also reduce the vibration frequency of the motor to avoid resonance while braking.

[0060] Figure 12-13 In the illustrated embodiment, the brake device 40 is constructed as a 4-pole 4-slot structure as a whole, that is, the permanent magnet 46 includes four magnetic poles, which are fixed in the shell seat 42 and arranged along the circumference of the shell seat 42. Preferably, the permanent magnet 46 is constructed as a ring structure as a whole. The magnetic conductive member 44 is sleeved with the rotating shaft 32 of the motor rotor 30, including a connecting portion 440 fixed on the rotating shaft 32 and four magnetic conductive portions 44a, 44b, 44c, 44d extending radially outward from the connecting portion 440, and adjacent magnetic conductive portions 44a, 44b, 44c, 44d are arranged at intervals in the circumferential direction to form four tooth slots 45. In this embodiment, each magnetic conductive portion 44a, 44b, 44c, 44d is roughly fan-shaped, and the tooth slot 45 is roughly U-shaped.

[0061] When braking, each magnetic pole is opposite to one of the magnetic conductive parts 44a, 44b, 44c, 44d to generate magnetic attraction. The brake device 40 of this embodiment can also reduce the vibration frequency of the motor to avoid resonance while braking.

[0062] It should be understood that the brake device 40 of the present application can be an N-pole N-slot structure, where N is an integer greater than 1. When braking, each pole of the permanent magnet 46 faces a magnetic portion of the magnetic member 44, and a greater magnetic attraction can be obtained to enable the motor rotor to stop rotating immediately and prevent the curtain from sliding down.

[0063] In the above embodiment, the motor is described by taking a brushed motor as an example. Those skilled in the art will appreciate that the braked motor is not limited to a brushed motor, but may also be a brushless motor or the like.

[0064] It should be noted that the above embodiments only express the preferred implementation of the present application, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the present application. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, such as combining different features in various embodiments, etc., which should all fall within the scope of protection of the present application.

Claims

1. A brake device for braking a motor rotor, characterized in that: The brake device includes a permanent magnet and a magnetic conductive part, wherein one of the permanent magnet and the magnetic conductive part is used to connect to the motor rotor, and the other of them is used to connect to the motor stator; the permanent magnet includes N magnetic poles, and the magnetic conductive part includes N tooth slots spaced apart in the circumferential direction, and the brake device constitutes an N-pole N-slot structure, wherein N is an integer greater than 1.

2. The brake device according to claim 1, characterized in that: The permanent magnet is used to connect to the motor rotor, the magnetic conductive member is used to connect to the motor stator, and the magnetic conductive member is arranged around the permanent magnet.

3. The brake device according to claim 2, characterized in that: The brake device is a 2-pole 2-slot structure. A long strip of space is provided in the magnetic conductive component. The permanent magnet is installed in the middle of the space. Two ends of the space respectively form two tooth slots.

4. The brake device according to claim 3, characterized in that: The space is runway-shaped, and the inner wall surface of the magnetic conductive part surrounding the space includes two planes located on opposite sides of the permanent magnet and two curved surfaces respectively connected between the two ends of the two planes. The length of the plane is greater than the outer diameter of the permanent magnet, and the two tooth grooves are formed at the positions of the two curved surfaces.

5. The brake device according to claim 4, characterized in that: The middle part of each plane is concave to form an arc surface, and the arc surface is gap-matched with the outer peripheral surface of the permanent magnet to form an air gap.

6. The brake device according to claim 5, characterized in that: The arc surface is coaxially arranged with the outer peripheral surface of the permanent magnet, and the air gap is a uniform air gap with a constant width in the circumferential direction.

7. The brake device according to claim 2, characterized in that: The brake device is a 2-pole 2-slot structure, and the magnetic conductive member includes two magnetic conductive parts symmetrically arranged on opposite sides of the permanent magnet, each of the magnetic conductive parts is cylindrical, and the axis of the magnetic conductive part is parallel to the motor shaft.

8. The brake device according to claim 1, characterized in that: The brake device is an N-pole N-slot structure, where N is an integer greater than 2; the permanent magnet is fixed on the motor stator, and includes N magnetic poles arranged along the circumferential direction; the magnetic conductive part includes a connecting part fixed on the motor shaft and N magnetic conductive parts extending radially outward from the connecting part, and the N magnetic conductive parts are spaced apart in the circumferential direction to form N tooth slots.

9. The brake device according to claim 8, characterized in that: Each of the magnetic conductive portions is substantially fan-shaped, and each of the tooth grooves is substantially U-shaped.

10. The brake device according to claim 1, characterized in that: The magnetic conductive member is made of a whole piece of magnetic conductive material or is formed by stacking a plurality of silicon steel sheets.

11. The brake device according to claim 6, characterized in that: It also includes a shell seat for installing the magnetic conductive component, one of the inner wall of the shell seat and the outer wall of the magnetic conductive component is provided with a protrusion, and the other one is provided with a groove, and the protrusion is embedded in the groove to fix the shell seat and the magnetic conductive component.

12. The brake device according to claim 2, characterized in that: It also includes a shell base for mounting the magnetic conductive component, the shell base is fixedly connected to the motor stator, and the connection position between the shell base and the motor stator is staggered or overlapped with the connection position between the shell base and the magnetic conductive component.

13. The brake device according to claim 2, characterized in that: The permanent magnet is annular and fixedly sleeved on a sleeve; the motor rotor comprises a rotating shaft, and the sleeve is fixedly sleeved on the rotating shaft.

14. A motor comprising a stator and a rotor rotatable relative to the stator, characterized in that: It also includes the braking device according to any one of claims 1-13.

15. The motor according to claim 14, characterized in that The motor rotor is also connected to a positioning magnetic ring, and the positioning magnetic ring and the brake device are respectively arranged at opposite ends of the motor rotor.

16. A rolling curtain device, comprising a housing, a motor disposed in the housing, and a curtain driven by the motor, characterized in that: The motor is the motor according to claim 14 or 15.

17. The roller blind device according to claim 16, characterized in that The motor is a tubular motor, and the self-locking frequency of the brake device is lower than 200 Hz.

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