Permanent magnet rotor type brake

Abstract

The utility model relates to the technical field of permanent magnet brakes, and particularly discloses a permanent magnet rotor type brake which comprises a magnet yoke, a rotor flange and a movable plate, the rotor flange and the movable plate are connected and keep synchronous rotation, an elastic piece is connected between the rotor flange and the movable plate in an abutting mode, a permanent magnet unit is embedded in the movable plate, and the elastic piece is connected with the movable plate in an abutting mode. The magnetic poles of the permanent magnet units point to the magnet yoke; when the magnet yoke is powered off, the permanent magnet unit drives the movable plate to be attracted to the end face of the magnet yoke for brake contact. According to the utility model, the processing and the assembly are more convenient, the manufacturing cost is reduced, and the magnetic torque is more convenient to adjust.

Description

Technical Field

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

[0002] Permanent magnet brakes primarily utilize the interaction between the magnetic field generated by a permanent magnet and the magnetic field generated by an electromagnetic coil to achieve braking and release functions. When the electromagnetic coil is not energized, the magnetic field generated by the permanent magnet attracts the armature, causing the armature to contact the friction surface of the stator, generating friction and thus achieving braking and preventing the rotor from rotating. When the electromagnetic coil is energized, the generated electromagnetic field cancels out or weakens the magnetic field of the permanent magnet, and the armature separates from the friction surface of the stator under the action of spring force, allowing the rotor to rotate freely and releasing the brake.

[0003] Most existing permanent magnet brakes incorporate the permanent magnets entirely within the stator, resulting in a larger number of components in the stator. This makes the stator more difficult to machine than that of a typical electromagnetic brake, leading to higher costs and assembly difficulties. Furthermore, since the permanent magnets are ultimately encapsulated within the stator, the magnetic torque cannot be adjusted, and there is a risk of failure due to poor sealing. If the brake fails testing and cannot be reworked, it must be scrapped. Therefore, the manufacturing, assembly, and maintenance costs are all very high. Utility Model Content

[0004] The purpose of this invention is to provide a permanent magnet rotor brake that is easy to process and assemble, and reduces costs.

[0005] This utility model is achieved through the following technical solution: a permanent magnet rotor brake, comprising a magnetic yoke, a rotor flange and a moving plate, wherein the rotor flange is connected to the moving plate and rotates synchronously, and an elastic element abuts between the rotor flange and the moving plate; the permanent magnet unit is embedded in the moving plate, and the magnetic pole of the permanent magnet unit points to the magnetic yoke; when the magnetic yoke is de-energized, the permanent magnet unit drives the moving plate to be attracted to the end face of the magnetic yoke for braking contact.

[0006] Furthermore, one end face of the moving plate is provided with a mounting slot for inserting the permanent magnet unit, and at least two permanent magnet units are stacked and inserted into the mounting slot.

[0007] Furthermore, the permanent magnet unit includes magnet blocks, and multiple magnet blocks are assembled separately in the mounting slot.

[0008] Furthermore, the mounting slot is provided with a limiting member to block the magnet block.

[0009] Furthermore, the magnet block is bonded to the mounting slot.

[0010] Furthermore, the rotor flange has a central hole, and the wall of the central hole is provided with a keyway along its radial direction.

[0011] Furthermore, it also includes a connecting screw, which passes through the rotor flange and the moving plate, and the elastic element is sleeved on the connecting screw.

[0012] Furthermore, the rotor flange is a cylindrical boss structure, and one end of the rotor flange is inserted into the inner hole of the magnetic yoke.

[0013] The technical solution of this utility model has at least the following advantages and beneficial effects: By opening an installation slot on the moving plate and embedding a permanent magnet in the installation slot, this utility model reduces the overall processing and assembly difficulty of the brake, shortens the attraction path of the permanent magnet, and the magnetic torque of the brake can also be adjusted according to the number of adjustment magnet blocks, thus avoiding the problem of unqualified products caused by poor sealing due to the original permanent magnet brake structure. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the internal structure of the permanent magnet rotor brake in this utility model.

[0015] Figure 2 This is a schematic diagram of the end face structure of one side of the moving plate in Embodiment 1 of this utility model;

[0016] Figure 3 This is a schematic diagram of the structure of the permanent magnet unit installed in the moving plate in Embodiment 2 of this utility model.

[0017] Reference numerals: 1-Magnetic yoke, 2-Moving plate, 21-Mounting slot, 3-Rotor flange, 31-Center hole, 311-Keyway, 4-Permanent magnet unit, 41-Magnetic block, 5-Limiting element, 6-Elastic element, 7-Connecting screw. Detailed Implementation

[0018] Example 1: The following description, in conjunction with specific Example 1, provides further details. Figures 1-2As shown, this embodiment is a permanent magnet rotor brake, including a magnetic yoke 1, a rotor flange 3, and a moving plate 2. The rotor flange 3 is connected to the moving plate 2 and rotates synchronously. An elastic element 6 abuts between the rotor flange 3 and the moving plate 2. A permanent magnet unit 4 is embedded in the moving plate 2, with the magnetic poles of the permanent magnet unit 4 pointing towards the magnetic yoke 1. When the magnetic yoke 1 is de-energized, the permanent magnet unit 4 drives the moving plate 2 to be attracted to the end face of the magnetic yoke 1 for braking contact. Specifically, conventional permanent magnet brakes have slots on their periphery to accommodate permanent magnets, and the distance between the permanent magnets and the moving plate 2 is relatively far, making processing difficult. In this embodiment, by embedding the permanent magnet unit 4 into one end face of the circular moving plate 2, the assembly difficulty is lower, the moving plate 2 does not require additional major processing, the distance between the permanent magnet unit 4 and the magnetic yoke 1 is closer, and the magnetic torque is greater. If a greater magnetic torque is required, the permanent magnet unit 4 can be replaced.

[0019] like Figure 1 and Figure 2 As shown, in this embodiment, one end face of the moving plate 2 is provided with a mounting slot 21 for inserting permanent magnet units 4. At least two permanent magnet units 4 are stacked and inserted into the mounting slot 21. The permanent magnet unit 4 includes a magnet block 41, and multiple magnet blocks 41 are separately spliced ​​in the mounting slot 21. Specifically, multiple mounting slots 21 are arranged evenly spaced around the moving plate 2, and the number of magnet blocks 41 inserted into the mounting slot 21 can be selected according to the magnitude of the magnetic torque, making it more convenient to assemble and disassemble.

[0020] In order to prevent the magnet block 41 from falling out of the mounting slot 21 and thus to prevent it from falling out, a limiting member 5 is provided in the mounting slot 21 to block the magnet block 41, such as a snap ring.

[0021] Alternatively, the magnet block 41 can be glued into the mounting slot 21. The magnet block 41 closest to the bottom of the mounting slot 21 can be glued together. When the magnetic torque is increased and magnet blocks 41 are added into the mounting slot 21, the two magnet blocks 41 can be held together by magnetic attraction.

[0022] like Figure 1 As shown, a central hole 31 is provided in the rotor flange 3, and a keyway 311 is arranged radially on the wall of the central hole 31; specifically, the rotor flange 3 of the brake is connected to the output shaft of the motor via a flat key.

[0023] This embodiment 1 also includes a connecting screw 7, which is connected to the rotor flange 3 and the moving plate 2, and the elastic element 6 is sleeved on the connecting screw 7; specifically, when the magnetic yoke 1 is energized, its magnetic field lines cancel each other out with the permanent magnet unit 4, and the elastic element 6 pulls the moving plate 2 close to the rotor flange 3 to release the brake; when the magnetic yoke 1 is de-energized, the permanent magnet unit 4 and the moving plate 2 are attracted to one side of the magnetic yoke 1, and the elastic element 6 is stretched and lengthened.

[0024] Furthermore, the rotor flange 3 has a cylindrical boss structure. One end of the rotor flange 3 is inserted into the inner hole of the magnetic yoke 1, which not only limits the radial direction of the rotor flange 3, but also allows the moving plate 2 to have a certain axial displacement. The inner hole of the moving plate 2 is adapted to the cylindrical boss structure of the rotor flange 3, and the cylindrical boss structure can play a certain guiding role.

[0025] Example 2: Refer to Figure 3 As shown, unlike Embodiment 1, the magnet block 41 can also be an integral structure, and the mounting slot 21 is an annular slot. The mounting slot 21 can also be fitted with a large and a small annular magnet block 41.

[0026] 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 permanent magnet rotor brake, comprising a magnetic yoke (1), a rotor flange (3), and a moving plate (2), wherein the rotor flange (3) is connected to the moving plate (2) and rotates synchronously, and an elastic element (6) abuts against the rotor flange (3) and the moving plate (2), characterized in that: The permanent magnet unit (4) is embedded in the moving plate (2), and the magnetic poles of the permanent magnet unit (4) point to the magnetic yoke (1); When the yoke (1) is de-energized, the permanent magnet unit (4) drives the moving plate (2) to be attracted to the end face of the yoke (1) for braking contact.

2. The permanent magnet rotor brake according to claim 1, characterized in that: The moving plate (2) has a mounting slot (21) on one side end face for inserting the permanent magnet unit (4), and at least two permanent magnet units (4) are stacked and inserted into the mounting slot (21).

3. The permanent magnet rotor brake according to claim 2, characterized in that: The permanent magnet unit (4) includes a magnet block (41), and multiple magnet blocks (41) are installed in the mounting slot (21) in a split-type splicing manner.

4. The permanent magnet rotor brake according to claim 3, characterized in that: The mounting slot (21) is provided with a limiting member (5) to block the magnet block (41).

5. The permanent magnet rotor brake according to claim 3, characterized in that: The magnet block (41) is bonded to the mounting slot (21).

6. The permanent magnet rotor brake according to claim 1, characterized in that: The rotor flange (3) has a central hole (31), and the wall of the central hole (31) is provided with a keyway (311) along its radial direction.

7. The permanent magnet rotor brake according to claim 1, characterized in that: It also includes a connecting screw (7), which passes through the rotor flange (3) and the moving plate (2), and the elastic element (6) is sleeved on the connecting screw (7).

8. The permanent magnet rotor brake according to claim 1, characterized in that: The rotor flange (3) is a cylindrical boss structure, and one end of the rotor flange (3) is inserted into the inner hole of the magnetic yoke (1).

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