Stator and permanent magnet brake

Abstract

The utility model relates to the technical field of brakes, and provides a stator and a permanent magnet brake, the stator comprises a magnet yoke, a coil, a magnetic conductive disc and a plurality of arc-shaped permanent magnets, the magnet yoke is of an integrated structure, one end of the magnet yoke is provided with an installation ring groove, and the coil is installed in the installation ring groove; a plurality of arc-shaped mounting holes communicated with the mounting ring groove are formed in the other end of the magnet yoke at intervals in the circumferential direction, and the permanent magnets are mounted in the arc-shaped mounting holes in a one-to-one correspondence manner; the magnetic conductive disc is fixedly arranged at one end of the magnet yoke provided with the arc-shaped mounting hole, the inner side or the outer side of one end of the magnetic conductive disc close to the magnet yoke is provided with an annular groove, and the permanent magnet is located in the radial range of the annular groove. According to the utility model, the structure of the magnet yoke is simplified, the magnet yoke can be processed in place at one time, and the assembling difficulty of the stator is also reduced.

Description

Technical Field

[0001] This utility model relates to the field of brake technology, and more specifically, to a stator and permanent magnet brake. Background Technology

[0002] Brakes, as a commonly used actuator, can decelerate or stop mechanical moving parts, thereby achieving the purpose of control. Among them, permanent magnet brakes use the magnetic field generated by permanent magnets to attract armatures and form a brake. When the coil is energized, a reverse electromagnetic force is generated to counteract the magnetic force generated by the permanent magnets. The armature is pulled back under the action of the spring, separating the armature from the stator and releasing the brake.

[0003] In existing permanent magnet brakes, the stator is composed of permanent magnets, yokes and coils. The yoke is usually composed of an inner magnetic cylinder and an outer magnetic cylinder. The space between the two not only forms a slot for installing the coil, but also a space for installing the permanent magnet. This method not only makes the yoke structure complex and the processing steps cumbersome, but also increases the difficulty of assembling the stator. Utility Model Content

[0004] The purpose of this invention is to provide a stator and a permanent magnet brake to overcome the aforementioned deficiencies in the prior art.

[0005] This utility model is achieved through the following technical solution:

[0006] A stator includes a magnetic yoke, a coil, a magnetic conductor, and a plurality of arc-shaped permanent magnets. The magnetic yoke is an integral structure. One end of the magnetic yoke has a mounting annular groove, in which the coil is installed. The other end of the magnetic yoke has a plurality of arc-shaped mounting holes that connect to the mounting annular groove at intervals along the circumferential direction, and the permanent magnets are installed in the corresponding arc-shaped mounting holes. The magnetic conductor is fixedly disposed at the end of the magnetic yoke with the arc-shaped mounting holes. The inner or outer side of the end of the magnetic conductor near the magnetic yoke has an annular groove, and the permanent magnets are located within the radial range of the annular groove.

[0007] Optionally, the inner side of the arc-shaped mounting hole is flush with the inner side of the mounting ring groove.

[0008] Optionally, the outer diameter of the magnetic disk is the same as the outer diameter of the magnetic yoke.

[0009] Optionally, the magnetic disk is bonded to the magnetic yoke or connected by fasteners.

[0010] The present invention also provides a permanent magnet brake, comprising an armature, a mounting flange, and a stator as described in any one of the above, wherein the armature and the mounting flange are disposed at the end of the stator having a mounting ring groove, and the armature is located between the stator and the mounting flange; an elastic member is provided between the armature and the flange to keep the armature tending to move away from the stator.

[0011] Optionally, the elastic component includes a connecting screw and a spring. The armature has a plurality of mounting countersunk holes spaced apart along the circumferential direction near one end of the stator. The mounting flange is connected to the armature by a connecting screw, with the head of the connecting screw located inside the mounting countersunk hole. The spring is located between the bottom of the mounting countersunk hole and the connecting screw.

[0012] Optionally, the mounting holes are evenly spaced along the circumferential direction.

[0013] Optionally, a buffer pad is provided between the armature and the mounting flange, and the buffer pad is fixed to the mounting flange.

[0014] The technical solution of this utility model has at least the following advantages and beneficial effects: In this utility model, the magnetic yoke is an integral structure, and permanent magnets are installed through arc-shaped mounting holes spaced along the circumferential direction on the magnetic yoke. At the same time, it works with a magnetic disk to provide a closed magnetic circuit when the coil is energized. This not only simplifies the magnetic yoke structure and allows it to be processed in one go, but also reduces the assembly difficulty of the stator. Attached Figure Description

[0015] Figure 1 A schematic diagram of the structure of a stator provided by this utility model;

[0016] Figure 2 for Figure 1 Top view (with hidden coils);

[0017] Figure 3 This is a schematic diagram of the magnetic yoke.

[0018] Figure 4 This is a schematic diagram of the disk structure;

[0019] Figure 5 A schematic diagram of the structure of an electromagnetic brake provided by this utility model;

[0020] Reference numerals: 1-Stator, 101-Yoke, 1011-Mounting ring groove, 1012-Arc mounting hole, 102-Coil, 103-Conductor disk, 1031-Annular groove, 104-Permanent magnet, 2-Armature, 3-Mounting flange, 4-Spring, 5-Connecting screw, 6-Buffer pad. Detailed Implementation

[0021] refer to Figures 1-4 This embodiment 1 provides a stator 1, including a magnetic yoke 101, a coil 102, a magnetic disk 103, and an arc-shaped permanent magnet 104.

[0022] The magnetic yoke 101 is a one-piece structure, cylindrical in shape. One end of the magnetic yoke 101 has a mounting ring groove 1011, in which the coil 102 is installed. The other end of the magnetic yoke 101 has several arc-shaped mounting holes 1012 that connect to the mounting ring groove 1011 at intervals along the circumference. Alternatively, in this embodiment, there are four arc-shaped mounting holes 1012, which are evenly spaced along the circumference. The number of permanent magnets 104 corresponds one-to-one with the number of arc-shaped mounting holes 1012. In practical applications, the permanent magnets 104 are fixedly installed in the arc-shaped mounting holes 1012 by adhesive bonding.

[0023] The guide disk 103 is fixedly mounted on the end of the magnetic yoke 101 that has an arc-shaped mounting hole 1012. In this embodiment, the guide disk 103 and the magnetic yoke 101 are fixed by adhesive bonding. In other embodiments, the guide disk 103 and the magnetic yoke 101 can also be connected by fasteners (such as screws, pins, etc.). The outer diameter of the guide disk 103 is the same as the outer diameter of the magnetic yoke 101 to ensure a neat and aesthetically pleasing structure. Furthermore, it should be understood that the brake usually needs to be mounted on the drive shaft; therefore, the magnetic yoke 101 and the guide disk 103 have clearance through holes at their centers.

[0024] In this embodiment, the inner side of the guide disk 103 near the yoke 101 is provided with an annular groove 1031, and the permanent magnet 104 is located within the radial range of the annular groove 1031, thus forming an air gap between the yoke 101 and the guide disk 103 at the permanent magnet 104. It is worth noting that when the stator 1 forms a brake, in the de-energized state, the magnetic field of the permanent magnet 104 mainly relies on the yoke 101 and the armature 2 to form a closed loop. Without the guide disk 103, after the coil 102 is energized, the permanent magnet 104 prevents the magnetic field generated by the coil 102 from forming a loop. With the guide disk 103, the guide disk 103 acts as a bridge, ensuring that the magnetic field generated by the coil 102 can form a closed loop. Based on this, it is easy to understand that in other embodiments, the annular groove 1031 of the guide disk 103 can also be provided on the outer side (in this case, the annular groove 1031 is equivalent to a step provided on the outer side of the guide disk 103), which can also achieve the above function.

[0025] Alternatively, the inner side of the arc-shaped mounting hole 1012 is flush with the inner side of the mounting ring groove 1011. In other embodiments, the arc-shaped mounting hole 1012 may of course be located at any position communicating with the mounting ring groove 1011.

[0026] refer to Figure 5The present invention also provides a permanent magnet brake, including an armature 2, a mounting flange 3, and the aforementioned stator 1. The armature 2 and the mounting flange 3 are located at one end of the stator 1 where a mounting annular groove 1011 is provided, and the armature 2 is located between the stator 1 and the mounting flange 3. An elastic member is provided between the armature 2 and the flange to keep the armature 2 tending to move away from the stator 1. It is easy to understand that in practical applications, the stator 1, the armature 2, and the mounting flange 3 are coaxially arranged. The stator 1 is fixed to the mounting surface, and the mounting flange 3 is fixed to the power shaft and rotates with the power shaft. When the brake is de-energized, the magnetic field generated by the permanent magnet causes the armature 2 to be attracted by the nail, forming a brake, while the elastic member stores energy. When the brake is energized, the magnetic field generated by the coil 102 cancels the magnetic field generated by the permanent magnet 104, and the armature 2 separates from the stator 1 under the action of the elastic member, releasing the brake.

[0027] As an alternative, in this embodiment, the elastic component includes a connecting screw 5 and a spring 4. The armature 2, near the stator 1, has several countersunk holes spaced circumferentially. The mounting flange 3 is connected to the armature 2 by the connecting screw 5, with the head of the connecting screw 5 located within the countersunk hole. The spring 4 is positioned between the bottom of the countersunk hole and the connecting screw 5. In practical applications, the countersunk holes are evenly spaced circumferentially to ensure that the elastic force is evenly distributed on the armature 2. In practical applications, the spring 4 is compressed when the coil 102 is de-energized and pushes the armature 2 towards the mounting flange 3 when the coil 102 is energized. Furthermore, the effective elastic force of the spring 4 can be adjusted by changing the screw depth of the connecting screw 5.

[0028] It should be understood that in other embodiments, the elastic component can of course be other structures, such as a leaf spring 4, which is fixedly connected between the armature 2 and the mounting flange 3.

[0029] Furthermore, in this embodiment, a buffer pad 6 is provided between the armature 2 and the mounting flange 3. The buffer pad 6 is fixed (e.g., glued) to the mounting flange 3 to prevent the armature 2 from colliding with the mounting flange 3 and generating noise when it resets under the action of the spring 4.

[0030] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A stator, characterized in that, The device includes a magnetic yoke, a coil, a conductive disk, and several arc-shaped permanent magnets. The magnetic yoke is an integral structure. One end of the magnetic yoke has a mounting annular groove, in which the coil is installed. The other end of the magnetic yoke has several arc-shaped mounting holes that connect to the mounting annular groove at intervals along the circumferential direction, and the permanent magnets are installed in the corresponding arc-shaped mounting holes. The conductive disk is fixedly disposed at the end of the magnetic yoke with the arc-shaped mounting holes. The inner or outer side of the end of the conductive disk near the magnetic yoke has an annular groove, and the permanent magnets are located within the radial range of the annular groove.

2. The stator according to claim 1, characterized in that, The inner side of the arc-shaped mounting hole is flush with the inner side of the mounting ring groove.

3. The stator according to claim 1, characterized in that, The outer diameter of the magnetic disk is the same as the outer diameter of the magnetic yoke.

4. The stator according to claim 1, characterized in that, The magnetic disk is bonded to the magnetic yoke or connected by fasteners.

5. A permanent magnet brake, characterized in that, The stator includes an armature, a mounting flange, and the stator as described in any one of claims 1-4. The armature and the mounting flange are located at the end of the stator where the mounting annular groove is provided, and the armature is located between the stator and the mounting flange. An elastic member is provided between the armature and the flange to keep the armature tending to move away from the stator.

6. The permanent magnet brake according to claim 5, characterized in that, The elastic component includes a connecting screw and a spring. The armature has several mounting countersunk holes spaced apart along the circumference at one end near the stator. The mounting flange is connected to the armature by a connecting screw, with the head of the connecting screw located inside the mounting countersunk hole. The spring is located between the bottom of the mounting countersunk hole and the connecting screw.

7. The permanent magnet brake according to claim 6, characterized in that, The mounting holes are evenly spaced along the circumference.

8. The permanent magnet brake according to claim 5, characterized in that, A buffer pad is provided between the armature and the mounting flange, and the buffer pad is fixed to the mounting flange.

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