Permanent magnet brake with integrated magnetic flux guide

Abstract

This invention discloses a permanent magnet brake with an integrated magnetic bridge, comprising a rotor flange and a magnetic housing. The magnetic housing houses a magnetizing component for magnetization. An axially movable armature is positioned between the magnetic housing and the rotor flange. At least one magnetic bridge protrudes from the end face of the magnetic housing facing the armature. The armature has a permanent magnet and a sliding portion adapted to the shape of the magnetic bridge. The main advantages of this invention are: the magnetic bridge and the sliding portion cooperate to always form a magnetically conductive path with extremely low magnetic resistance. The magnetic lines of force generated by the coil do not need to cross the variable air gap between the armature and the magnetic housing in existing technologies, meaning the magnetic resistance in the magnetic circuit does not change significantly with the armature position. This ensures that the magnetic force and response characteristics remain consistent for each braking and releasing action, improving the stability and reliability of the brake. Simultaneously, the magnetic bridge has an intrusive fit, increasing the effective contact area between the magnetic housing and the armature, further reducing magnetic resistance and making the magnetic circuit smoother.

Description

Technical Field

[0001] This invention relates to the field of brake technology, and more particularly to a permanent magnet brake with an integrated magnetic bridge. Background Technology

[0002] Permanent magnet brakes are widely used in industrial robots, machine tools, elevators, and various automated systems and processing equipment. The rotor connecting the output shaft and the fixed magnetic housing are linked by a magnetic pair, providing a stable braking torque to the output shaft. Because permanent magnet brakes have stable braking torque and are unaffected by slip, their application in the braking field is becoming increasingly widespread.

[0003] For example, patent application CN 220566467 U discloses a low-power electromagnetic brake, the structure of which includes a stator and a rotor. The stator includes a magnetic shell and friction plates mounted on the magnetic shell, with a coil installed inside the magnetic shell. The rotor includes a rotor flange mounted on a motor shaft, with an armature positioned between the rotor flange and the friction plates. The armature is mounted on the rotor end face near the magnetic shell via a leaf spring, and multiple circumferentially uniformly distributed permanent magnets are embedded in the armature. When the coil is energized, this electromagnetic brake provides an electromagnetic field that attracts the armature, causing it to move and adhere tightly to the friction plates, thus achieving braking. However, during this braking process, due to the gap between the armature and the stator, and the extremely low permeability of air (i.e., the magnetic reluctance of the magnetic circuit increases sharply), most of the magnetomotive force is used to overcome the air gap resistance, significantly reducing the ability to generate magnetic flux.

[0004] Therefore, such a structure has significant limitations: 1. Using electromagnetic force for braking, the uncertainty of the electromagnetic force due to the existence of the air gap and the continuous change in the width of the air gap during braking leads to uncertainty in the braking effect each time; 2. Furthermore, a reduction in the electromagnetic force will also weaken the braking effect. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a permanent magnet brake with an integrated magnetic bridge.

[0006] The objective of this invention is achieved through the following technical solution: A permanent magnet brake with an integrated magnetic bridge includes a rotor flange and a magnetic housing disposed opposite to each other. The rotor flange is fixed to the end face of a motor shaft and rotates coaxially with it. The magnetic housing has a magnetizing assembly built into it, which includes a receiving cavity formed on the magnetic housing, a frame built into the receiving cavity, and a coil wound on the frame. An axially movable armature is provided between the magnetic housing and the rotor flange. An annular groove is provided on the end face of the armature facing the rotor flange. A permanent magnet is fixed in the annular groove. The magnetization direction of the permanent magnet is radial. A magnetic bridge is protruding on the end face of the magnetic housing facing the armature. When the armature receives external magnetic force and moves to any position, the magnetic bridge is always in contact with the armature.

[0007] Preferably, the armature is provided with a sliding portion that is adapted to the shape of the magnetic bridge, and the magnetic bridge slides within the sliding portion with a portion of its structure always extending into the sliding portion.

[0008] Preferably, the magnetic bridge is an annular protrusion.

[0009] Preferably, the magnetic bridges include at least two, which are respectively disposed on both radial sides of the magnetization component.

[0010] Preferably, the magnetic bridge is located on the outermost radial side of the magnetic shell, and its inner side is always in contact with the outer end face of the armature.

[0011] Preferably, the axial height of the magnetic bridge is greater than or equal to the maximum moving distance of the armature between the magnetic housing and the rotor flange.

[0012] Preferably, a limiting component is provided between the armature and the magnetic housing to restrict the circumferential rotation of the armature. The limiting component includes at least one guide pin fixedly disposed on the end face of the magnetic housing facing the armature, and the armature is provided with a guide hole adapted to the guide pin.

[0013] Preferably, a set of annular grooves arranged circumferentially are formed on the end face of the armature facing the rotor flange; the annular grooves extend radially along the armature and are evenly distributed circumferentially, and the permanent magnet is placed in the corresponding annular groove; in the direction facing the rotor flange, the outer surface of the permanent magnet is lower than the outer surface of the armature.

[0014] Preferably, the motor shaft is provided with an encoder and cables for controlling the motor.

[0015] Preferably, the permanent magnet is fixed to the annular groove of the armature by high-temperature resistant epoxy resin adhesive or by riveting technology.

[0016] This invention also discloses a permanent magnet brake with an integrated magnetic bridge, comprising a rotor flange and a magnetic housing disposed opposite to each other. The rotor flange is fixed to the end face of a motor shaft and rotates coaxially with it. The magnetic housing contains a magnetizing assembly for magnetizing the rotor flange. The magnetizing assembly includes a cavity formed in the magnetic housing, a frame housed within the cavity, and a coil wound on the frame. An axially movable armature is provided between the magnetic housing and the rotor flange. An annular groove is provided on the end face of the armature facing the rotor flange, and a permanent magnet is fixed within the annular groove. The magnetization direction of the permanent magnet is radial. A limiting component is provided between the armature and the magnetic shell to restrict the circumferential rotation of the armature. At least a portion of the armature has an inner diameter larger than the inner diameter of the magnetic shell and an outer diameter in the radial direction smaller than the outer diameter of the magnetic shell, such that the armature is located in a receiving groove on the end face of the magnetic shell. The enclosure portion forming the receiving groove is a magnetic bridge. The axial height of the magnetic bridge is greater than or equal to the maximum movement distance of the armature between the magnetic shell and the rotor flange. When the armature receives external magnetic force and moves to any position, the inner surface of the magnetic bridge is always in contact with the outer end face of the armature.

[0017] The beneficial effects of this invention are mainly reflected in: 1. This invention establishes a fixed magnetic circuit path with extremely low magnetic reluctance between the magnetic shell and the armature through a magnetic bridge. When the coil is energized, the magnetic lines of force generated can preferentially pass through the magnetic bridge and directly enter the armature, reducing the variable air gap between the armature and the end face of the magnetic shell, which has high magnetic reluctance and must pass through in traditional designs. Simultaneously, because the magnetic bridge and the armature are always in contact, the magnetic reluctance in the magnetic circuit remains essentially constant and does not change with the position of the armature, ensuring that the magnetic force and response characteristics remain consistent for each braking and releasing action, thus improving the stability and reliability of the brake operation.

[0018] 2. The magnetic bridge features an intrusive fit, increasing the effective contact area with the armature, further reducing magnetic resistance, and making the magnetic circuit smoother. Simultaneously, the magnetic bridge is a ring-shaped protrusion machined directly from the end face of the magnetic shell, and the sliding part is also machined directly on the armature, eliminating the need for additional parts and facilitating mass production.

[0019] 3. The axial height of the magnetic bridge is greater than or equal to the maximum movement distance of the armature between the magnetic shell and the rotor flange. This ensures that even when the armature is in the position furthest from the magnetic shell (i.e., when it is fully in contact with the rotor flange for braking), at least part of the magnetic bridge can still contact the groove of the sliding part. This prevents the possibility of an air gap between the magnetic bridge and the armature due to excessive stroke, thus ensuring the integrity of the secondary magnetic circuit under any working condition.

[0020] 4. By evenly distributing a set of permanent magnets along the circumference of the armature, a very uniform and symmetrical radial magnetic field can be generated. This makes the braking torque acting on the rotor flange consistent in magnitude throughout the circumference, resulting in a smooth braking process without periodic fluctuations or torsional vibrations. At the same time, a set of individual permanent magnets is easier to arrange within a thin armature than a single large toroidal magnet, making it particularly suitable for radial magnetization. Attached Figure Description

[0021] The technical solution of the present invention will be further described below with reference to the accompanying drawings: Figure 1 : A cross-sectional view of the first embodiment of the permanent magnet brake of the present invention in the initial state (brake release state); Figure 2 : A cross-sectional view of the first embodiment of the permanent magnet brake of the present invention in the braking state; Figure 3 : A cross-sectional view of the second embodiment of the permanent magnet brake of the present invention in the braking state; Figure 4 : A cross-sectional view of the third embodiment of the permanent magnet brake of the present invention in the brake release state; Figure 5 : A cross-sectional view of the third embodiment of the permanent magnet brake of the present invention in the braking state; Figure 6 : An exploded view of the structure of the third embodiment of the permanent magnet brake of the present invention; Figure 7 : A schematic diagram of the magnetic circuit of the third embodiment of the permanent magnet brake of the present invention in the braking state; Figure 8 : A schematic diagram of the magnetic circuit of the third embodiment of the permanent magnet brake of the present invention during the initial energization stage in the braking state; Figure 9 : A schematic diagram of the magnetic circuit of the third embodiment of the permanent magnet brake of the present invention in the brake release state; Figure 10 Simulation diagram of magnetic induction intensity at the magnetic bridge of the permanent magnet brake of this invention. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments are not limited to the present invention, and any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are included within the scope of protection of the present invention.

[0023] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not 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 invention. Furthermore, in the accompanying drawings, components that are originally close together are shown with enlarged gaps for illustration purposes.

[0024] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] like Figure 1 , Figure 2 As shown, this invention discloses a permanent magnet brake with an integrated magnetic bridge, comprising a rotor flange 1 and a magnetic housing 2 arranged opposite to each other. The rotor flange 1 is fixed to a motor shaft 8 and rotates coaxially with it. The fixing method can be conventional, such as screws or riveting. In this embodiment, the motor shaft 8 is a hollow shaft, which houses an encoder 7 and cables for controlling the motor. As is well known to those skilled in the art, the encoder 7 controls the rotation of the motor rotor, which can drive the motor shaft 8 and the rotor flange 1 to rotate. Simultaneously, the encoder 7 can monitor the speed, position, and other information of the drive motor in real time, providing precise data support for the control of the brake. The magnetic housing 2 can be fixed to the fixed flange 9 with screws 90, thus the magnetic housing 2 is relatively fixed and cannot rotate.

[0026] The magnetic housing 2 has a built-in magnetizing component 5 for magnetizing it. Similar to existing brakes, the magnetizing component 5 includes a receiving cavity 53 formed on the magnetic housing 2. The receiving cavity 53 contains a frame, and a coil 54 is wound around the frame. The coil 54 is wound on the frame and placed inside the receiving cavity 53, which is convenient for assembly. Of course, it is also feasible to directly remove the frame and wind the coil.

[0027] In this invention, an axially movable armature 3 is provided between the magnetic housing 2 and the rotor flange 1. An annular groove 31 is formed on the end face of the armature 3 facing the rotor flange 1. Preferably, it is combined with... Figure 6As shown, a set of annular grooves 31 arranged circumferentially are formed on the end face of the armature 3 facing the rotor flange 1; the annular grooves 31 extend radially along the armature 3 and are evenly distributed circumferentially, and permanent magnets 6 are fixed in the annular grooves 31. The permanent magnets 6 are fixed in the annular grooves 31 of the armature 3 by high-temperature epoxy resin adhesive or by riveting technology. Of course, the shape and number of annular grooves 31 are variable, for example, a complete arc-shaped annular groove can be used. Facing the rotor flange 1, the outer surface of the permanent magnet 6 is lower than the outer surface of the armature 3. That is, the permanent magnet is completely covered inside the armature, which can effectively prevent the permanent magnet from being directly bumped or worn during assembly and operation.

[0028] In this invention, the magnetization direction of the permanent magnet 6 is radial. A detailed magnetic circuit diagram will be provided later. Distributing a set of permanent magnets evenly along the circumference of the armature can generate a very uniform and symmetrical radial magnetic field.

[0029] A limiting component 4 is provided between the armature 3 and the magnetic housing 2 to restrict the circumferential rotation of the armature 3. The limiting component 4 includes at least one guide pin 41 fixedly disposed on the end face of the magnetic housing 2 facing the armature 3. The armature 3 has a guide hole 42 adapted to the guide pin 41. The cooperation between the guide pin 41 and the guide hole 42 forces the armature to move only in a straight line along the axial direction, preventing circumferential rotation or radial offset during engagement or disengagement. This ensures that the friction end faces of the armature and the rotor flange can be completely parallel and in contact, thereby ensuring uniform distribution of braking torque and consistent wear, and reducing vibration and noise caused by skew, significantly improving the reliability and consistency of braking action.

[0030] In this invention, a magnetic bridge 21 protrudes from the end face of the magnetic shell 2 facing the armature 3, and a sliding portion 32 corresponding to the shape of the magnetic bridge 21 is provided on the armature 3. In this embodiment, the magnetic bridge 21 is cylindrical, but it can also be discontinuous or continuous annular, as long as it protrudes from the magnetic pole surface of the magnetic shell 2 and penetrates the armature 3. The sliding portion 32 can be configured as a corresponding receiving structure. Specifically, the axial height of the magnetic bridge is greater than or equal to the maximum moving distance of the armature 3 between the magnetic shell 2 and the rotor flange 1. Since the axial height of the magnetic bridge is greater than or equal to the maximum moving distance of the armature between the magnetic shell and the rotor flange, it is ensured that when the armature is in the position furthest from the magnetic shell (i.e., when it is fully in contact with the rotor flange for braking), the magnetic bridge can still be embedded in or at least contact the corresponding groove of the sliding portion 32. In this way, when the armature 3 is moved to any position due to external magnetic force, the magnetic bridge 21 remains in contact with the armature 3. That is, the magnetic bridge 21 slides within the sliding part 32, and a portion of the magnetic bridge structure always extends into the sliding part 32 during the sliding process. Therefore, the possibility of an air gap appearing between the magnetic bridge and the armature due to excessive stroke can be eliminated, thus ensuring the integrity of the secondary magnetic circuit under any operating condition.

[0031] The working process of this invention is briefly described below: like Figure 1 As shown, in the initial state (brake release state), there is a gap 10 between the rotor flange 1 and the armature 3. The rotor flange 1 and the motor shaft 8 can rotate freely.

[0032] like Figure 2 As shown, when the coil 54 is de-energized, the magnetic field generated by the permanent magnet 6 drives the armature 3 to move towards the rotor flange 1 and engage, with the moving distance being approximately equal to the width of the gap 10. Since the armature 3 cannot rotate, rotational braking of the motor shaft 8 is achieved.

[0033] When the coil 54 is energized, the magnetization component 5 operates. The magnetic lines of force generated by the coil 54 enter the armature 3 through the low magnetic resistance path formed by the magnetic shell 2 and the magnetic bridge 21. This magnetic circuit demagnetizes the permanent magnet 6, weakening its magnetic field, and generates a strong electromagnetic attraction on the armature 3. When the electromagnetic attraction is dominant, the armature 3 is attracted to the magnetic shell 2, and the brake is released.

[0034] In this embodiment, the magnetic bridge 21 includes at least two, respectively disposed on both radial sides of the magnetization component 5. Of course, as... Figure 3 In the second embodiment shown, the number and position of the magnetic bridges 21 can be adjusted according to the actual size of the brake.

[0035] like Figure 4 , Figure 5 , Figure 6 The third embodiment shown is the same as the first embodiment, including a rotor flange 1 and a magnetic housing 2 arranged opposite to each other. The rotor flange 1 is fixed to the end face of the motor shaft 8 and rotates coaxially with it. The magnetic housing 2 is fixed to the fixed flange 9 and remains stationary. The magnetic housing 2 has a magnetizing component 5 built in it, which includes a receiving cavity 53 formed on the magnetic housing 2, a frame built in the receiving cavity 53, and a coil 54 wound on the frame. An axially movable armature 3 is provided between the magnetic housing 2 and the rotor flange 1. The end face of the armature 3 facing the rotor flange 1 has an annular groove 31, in which a permanent magnet 6 is fixed. A limiting component 4 is provided between the armature 3 and the magnetic housing 2 to limit the circumferential rotation of the armature 3. In this embodiment, at least a portion of the armature 3 has an inner diameter larger than the inner diameter of the magnetic shell 2, while its radial outer diameter is smaller than the outer diameter of the magnetic shell 2, such that the armature 3 is located within the receiving groove 23 on the end face of the magnetic shell 2, and the enclosure portion forming the receiving groove 23 is a magnetic bridge 21. The magnetic bridge 21 can be located on the outermost radial side and / or the innermost radial side of the magnetic shell 2, and its inner surface 22 is always in contact with the outer end face 33 of the armature 3. The axial height of the magnetic bridge 21 is greater than or equal to the maximum moving distance of the armature 3 between the magnetic shell 2 and the rotor flange 1. When the armature 3 receives external magnetic force and moves to any position, the inner surface 22 of the magnetic bridge 21 is always in contact with the outer end face 33 of the armature 3.

[0036] This invention establishes a fixed magnetic circuit path with extremely low magnetic reluctance between the magnetic shell and the armature through a magnetic bridge. When the coil is energized, the magnetic lines of force generated can preferentially pass through the magnetic bridge and directly enter the armature, reducing the variable air gap between the armature and the magnetic shell end face, which has high magnetic reluctance and must pass through in traditional designs. Simultaneously, because the magnetic bridge and armature are always in contact, the magnetic reluctance in the magnetic circuit remains essentially constant and does not change with the armature position, ensuring that the magnetic force and response characteristics remain consistent for each braking and releasing action, thus improving the stability and reliability of the brake operation. Specifically, as follows... Figure 7 , Figure 8 , Figure 9 The diagram shows a magnetic circuit. The magnetization direction of the permanent magnet 6 described in this invention is radial. Figure 7 This is a schematic diagram of the magnetic circuit in the braking state. At this time, the coil 54 is de-energized, and the magnetic field line path generated by the permanent magnet 6 is: N pole - armature - rotor flange - armature - S pole. The magnetic force drives the armature 3 to move towards the rotor flange 1 and attract it. Since the armature 3 cannot rotate, the rotation braking of the motor shaft 8 is achieved. Figure 8This is a schematic diagram of the magnetic circuit during the initial energization phase in braking mode. At this time, coil 54 is energized. Due to the large air gap between armature 3 and the end face of magnetic shell 2, the electromagnetic force lines generated by coil 54 follow the path: magnetic shell - magnetic bridge - armature - permanent magnet - armature - magnetic bridge - magnetic shell. The magnetic force lines generated by coil 54 enter armature 3 through the low magnetic resistance path formed by magnetic shell 2 and magnetic bridge 21, demagnetizing permanent magnet 6 and weakening its magnetic field. Finally, when the electromagnetic attraction is dominant, armature 3 is attracted to magnetic shell 2, and the brake is released. In this process, the electromagnetic force does not need to pass through the air gap; it enters the armature directly through the magnetic bridge to achieve the above purpose. Figure 10 As can be seen from the magnetic induction intensity simulation diagram, the magnetic force is greatest at the contact point between the magnetic bridge and the armature. This demonstrates that the magnetic bridge of this invention uses an intrusive fit, increasing the effective contact area with the armature, further reducing magnetic resistance, and making the magnetic circuit smoother. Figure 9 This is a schematic diagram of the magnetic circuit in the fully released braking state. At this time, coil 54 is energized. Since the armature 3 and the end face of the magnetic shell 2 are completely closed, the electromagnetic force line path generated by coil 54 is: magnetic shell end face - armature - permanent magnet - armature - magnetic shell end face. At this point, the armature 3 is completely separated from the rotor flange, and the braking torque disappears.

[0037] Furthermore, the brake of this invention has an overall flat annular structure. While achieving flatness, the radius of gyration of the friction surface can be designed to be larger. Therefore, with the same volume or amount of permanent magnets, it can generate the same or even greater braking torque. The flat rotor flange 1 helps to reduce deflection and vibration during high-speed operation, the mass tends to be radially distributed, and the distribution of rotational inertia may be more reasonable.

[0038] Meanwhile, the brake of the present invention has a central through hole, which is naturally formed by the annular structure of the brake, allowing power lines, signal lines, optical cables and even fluid pipes to pass through the center, eliminating the risk of cable entanglement caused by the rotation of external equipment, improving system reliability, and can be combined with slip rings to achieve infinite continuous rotation.

[0039] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0040] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. All equivalent embodiments or modifications made without departing from the spirit of the present invention should be included within the scope of protection of the present invention.

Claims

1. Integrated permanent magnet brake with magnetic flux bridge, comprising oppositely arranged rotor flange (1) and magnetic shell (2), the rotor flange (1) is fixed on the end face of the motor shaft (8) and rotates coaxially with it, the magnetic shell (2) is built-in with magnetization assembly (5) to magnetize it, the magnetization assembly (5) comprises a containing cavity (53) opened on the magnetic shell (2), and a skeleton built-in in the containing cavity (53) and a coil (54) wound on the skeleton, the magnetic shell (2) and the rotor flange (1) are provided with an axially movable armature (3), characterized in that: The armature (3) is provided with a ring groove (31) on the end face facing the rotor flange (1), a permanent magnet (6) is fixed in the ring groove (31), the magnetization direction of the permanent magnet (6) is radial, the magnetic shell (2) is provided with a magnetic bridge (21) protruding on the end face facing the armature (3), when the armature (3) moves to any position due to receiving external magnetic force, the magnetic bridge (21) is always in contact with the armature (3).

2. The integrated flux guide bridge permanent magnet brake of claim 1, wherein: The armature (3) is correspondingly provided with a sliding part (32) matching the shape of the magnetic bridge (21), the magnetic bridge (21) slides in the sliding part (32) and always has part of the structure extending into the sliding part (32).

3. The integrated flux guide bridge permanent magnet brake of claim 2, wherein: The magnetic bridge (21) is annular protrusion.

4. The integrated flux guide bridge permanent magnet brake of claim 3, wherein: The magnetic bridge (21) includes at least two, respectively arranged on the two sides of the magnetized assembly (5) in the radial direction.

5. The integrated flux guide bridge permanent magnet brake of claim 1, wherein: The magnetic bridge (21) is located at the outermost side of the magnetic shell (2) in the radial direction, and the inner side surface (22) of the magnetic bridge (21) is always in contact with the outer end surface (33) of the armature (3).

6. The integrated flux guide bridge permanent magnet brake of claim 1, wherein: The axial height of the magnetic bridge (21) is greater than or equal to the maximum movement distance of the armature (3) between the magnetic shell (2) and the rotor flange (1).

7. The integrated flux guide bridge permanent magnet brake of any one of claims 1-6, wherein: The armature (3) and the magnetic shell (2) are provided with a limiting assembly (4) for limiting the circumferential rotation of the armature (3), the limiting assembly (4) includes at least one guide pin (41) fixed on the end face of the magnetic shell (2) facing the armature (3), and the armature (3) is provided with a guide hole (42) matching the guide pin (41).

8. The integrated flux guide bridge permanent magnet brake of any one of claims 1-6, wherein: The armature (3) is provided with a group of ring grooves (31) arranged along the circumferential direction on the end face facing the rotor flange (1); the ring grooves (31) extend in the radial direction of the armature (3) and are uniformly distributed in the circumferential direction, and the permanent magnet (6) is arranged in the corresponding ring groove (31); in the direction facing the rotor flange (1), the outer surface of the permanent magnet (6) is lower than the outer surface of the armature (3).

9. The integrated flux guide bridge permanent magnet brake of any of claims 1-6, wherein: The permanent magnet (6) is fixed in the ring groove (31) of the armature (3) by high-temperature resistant epoxy resin or by riveting technology.

10. A permanent magnet brake integrated with a magnetic conductive bridge, comprising oppositely arranged rotor flange (1) and magnetic shell (2), the rotor flange (1) is fixed on the end face of the motor shaft (8) and rotates coaxially with it, the magnetic shell (2) is built-in with magnetization assembly (5) to magnetize it, the magnetization assembly (5) comprises a containing cavity (53) opened on the magnetic shell (2), and a skeleton built-in in the containing cavity (53) and a coil (54) wound on the skeleton, the magnetic shell (2) and the rotor flange (1) are provided with an axially movable armature (3), characterized in that: The armature (3) is provided with a ring groove (31) on the end face of the rotor flange (1), the ring groove (31) is fixed with a permanent magnet (6), the magnetization direction of the permanent magnet (6) is radial, the armature (3) and the magnetic shell (2) are provided with a limiting assembly (4) for limiting the circumferential rotation of the armature (3), at least a part of the armature (3) has an inner diameter greater than the inner diameter of the magnetic shell (2) and a radial direction outer diameter less than the outer diameter of the magnetic shell (2), so that the armature (3) is located in the receiving groove (23) of the end face of the magnetic shell (2), the surrounding part forming the receiving groove (23) is a magnetic bridge (21), the axial height of the magnetic bridge (21) is greater than or equal to the maximum moving distance of the armature (3) between the magnetic shell (2) and the rotor flange (1), when the armature (3) moves to any position due to receiving external magnetic force, the inner side surface (22) of the magnetic bridge (21) is always in contact with the outer end surface (33) of the armature (3).

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