Split type permanent magnet brake

Abstract

The utility model relates to the technical field of brakes, and provides a split type permanent magnet brake which comprises a permanent magnet, a stator, a movable plate and a rotor, the stator is composed of a magnet yoke and a coil, the rotor is fixed on a motor shaft, the movable plate is clamped between the stator and the rotor, and the movable plate is fixed in the circumferential direction but can move in the axial direction; the rotor comprises an inner magnetic conductive cylinder and an outer magnetic conductive cylinder, and the permanent magnet is connected between the inner magnetic conductive cylinder and the outer magnetic conductive cylinder. The stator and the permanent magnet are separated, the stator, the movable plate and the rotor are mutually independent and work cooperatively, the installation and maintenance difficulty is reduced, no spring is needed, and the product problem caused by spring failure is avoided.

Description

Technical Field

[0001] This utility model relates to the field of brake technology, and more specifically, to a split-type 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 force generated by permanent magnets to brake. For example, the applicant provided a permanent magnet brake with adjustable spring force in the prior application with application number "2025202686921", which typically includes a permanent magnet, a stator, a moving plate (also called an armature), a rotor, and a spring.

[0003] However, in current permanent magnet brakes, the permanent magnet and stator are integrated into one structure. This structure is difficult to maintain in the later stages and is prone to product problems due to spring failure. Utility Model Content

[0004] The purpose of this invention is to provide a split-type permanent magnet brake to solve the above-mentioned defects of existing permanent magnet brakes.

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

[0006] A split-type permanent magnet brake includes a permanent magnet, a stator, a moving plate, and a rotor. The stator consists of a magnetic yoke and a coil. The rotor is fixed on the motor shaft. The moving plate is sandwiched between the stator and the rotor. The moving plate is fixed in the circumferential direction but can move in the axial direction. The rotor includes an inner magnetic cylinder and an outer magnetic cylinder. The permanent magnet is connected between the inner magnetic cylinder and the outer magnetic cylinder.

[0007] Optionally, the outer magnetic cylinder has an inner annular groove at one end near the moving plate, the inner magnetic cylinder is located inside the inner annular groove, the permanent magnet is connected between the bottom of the inner annular groove and the end of the inner magnetic cylinder away from the moving plate, and a gap is left between the outer wall of the inner magnetic cylinder and the inner wall of the outer magnetic cylinder.

[0008] Optionally, the inner magnetic cylinder has an outer annular groove at one end near the moving plate, and the end of the inner magnetic cylinder near the moving plate is flush with the end of the outer magnetic cylinder near the moving plate.

[0009] Optionally, the inner magnetic cylinder and the outer magnetic cylinder are connected and fixed by fasteners.

[0010] Optionally, the permanent magnet is a magnetic steel.

[0011] Optionally, the permanent magnet is in the shape of a ring.

[0012] Optionally, the permanent magnet has a tile-like structure, and multiple permanent magnets are distributed in a ring along the motor shaft.

[0013] Optionally, the rotor is connected to the motor shaft via a flange.

[0014] The technical solution of this utility model has at least the following advantages and beneficial effects: In this utility model, when no power is applied, the magnetic force generated by the permanent magnet acts on the moving plate, causing the moving plate to be attracted to the rotor and generating braking torque, thus braking the motor shaft; when power is applied, the stator generates electromagnetic force, and the magnetic force is opposite to the permanent magnet force. As the current increases, the electromagnetic force gradually becomes greater than the permanent magnet force, the moving plate detaches from the rotor and is attracted to the stator, releasing the braking. The stator and permanent magnet are separated, and the stator, moving plate, and rotor work independently yet collaboratively, reducing the difficulty of installation and maintenance, and eliminating the need for springs, thus avoiding product problems caused by spring failure. Attached Figure Description

[0015] Figure 1 A schematic diagram of a split-type permanent magnet brake provided by this utility model;

[0016] Figure 2 This is a schematic diagram showing the assembly relationship between the rotor and the permanent magnet.

[0017] Figure 3 This is a schematic diagram of the braking state;

[0018] Figure 4 Diagram of the brake release state

[0019] Reference numerals in the attached diagram: 1-Stator, 101-Yoke, 102-Coil, 2-Moving plate, 3-Rotor, 301-Outer magnetic cylinder, 302-Inner magnetic cylinder, 4-Permanent magnet, 5-Motor shaft. Detailed Implementation

[0020] refer to Figure 1 A split-type permanent magnet brake includes a permanent magnet 4, a stator 1, a moving plate 2, and a rotor 3.

[0021] The stator 1 consists of a magnetic yoke 101 and a coil 102. When the coil 102 is energized, it generates electromagnetic force. In practical applications, the stator 1 is fixed to the mounting surface.

[0022] The rotor 3 includes an inner magnetic cylinder 302 and an outer magnetic cylinder 301. A permanent magnet 4 is connected between the inner magnetic cylinder 302 and the outer magnetic cylinder 301. The rotor 3 is fixed to the motor shaft 5, meaning that the rotor 3 rotates synchronously with the motor shaft 5. The method of fixing the rotor 3 to the motor shaft 5 is not limited. For example, in this embodiment, the rotor 3 and the motor shaft 5 are connected via a flange (not shown in the figure), and the flange is then fixed to the outer magnetic cylinder 301 with screws. In other embodiments, the rotor 3 and the motor shaft 5 can also be connected in other ways, such as via spline connection or key connection.

[0023] The movable plate 2 is fixed circumferentially but movable axially. That is, the movable plate 2 itself cannot rotate but can move along the motor shaft 5. The movable plate 2 is sandwiched between the stator 1 and the rotor 3. It should be understood that a clearance should be left between the rotor 3 and the stator 1 for the movable plate 2 to move (this is easy to understand; the clearance width in the attached diagram is shown for ease of understanding and does not represent the actual width of the clearance). It is worth noting that there are various ways to achieve "the movable plate 2 is fixed circumferentially but movable axially," and this embodiment does not impose specific limitations. For example, the movable plate 2 can be connected to the brake fixing part (such as the housing) via a connecting key. Alternatively, the movable plate 2 can have a polygonal structure, and the brake fixing part (such as the housing) can have holes (also having corresponding polygonal structures) that mate with the movable plate 2.

[0024] refer to Figure 3 When no power is applied, the magnetic force generated by the permanent magnet 4 acts on the moving plate 2, causing the moving plate 2 to adhere to the rotor 3 and generate braking torque, thus braking the motor shaft 5; (Reference) Figure 4 When energized, stator 1 generates an electromagnetic force, which is opposite to the permanent magnet force. As the current increases, the electromagnetic force gradually becomes greater than the permanent magnet force, causing the moving plate 2 to detach from the rotor 3 and adhere to the stator 1, thus releasing the brake. The stator 1 separates from the permanent magnet 4. The stator 1, moving plate 2, and rotor 3 work independently yet collaboratively, reducing installation and maintenance difficulties. Moreover, it eliminates the need for springs, avoiding product problems caused by spring failure.

[0025] refer to Figure 2 In this embodiment, the outer magnetic cylinder 301 has an inner annular groove at one end near the moving plate 2, and the inner magnetic cylinder 302 is disposed inside the inner annular groove. The permanent magnet 4 is connected between the bottom of the inner annular groove and the end of the inner magnetic cylinder 302 away from the moving plate 2. A gap is left between the outer wall of the inner magnetic cylinder 302 and the inner wall of the outer magnetic cylinder 301. Furthermore, the inner magnetic cylinder 302 has an outer annular groove at one end near the moving plate 2, and the end of the inner magnetic cylinder 302 near the moving plate 2 is flush with the end of the outer magnetic cylinder 301 near the moving plate 2. This arrangement optimizes the magnetic circuit and makes it easier to reduce the contact area between the rotor 3 and the moving plate 2 while ensuring the saturation magnetic induction intensity, so that the specific pressure is greater and the braking torque is greater under the same permanent magnet force.

[0026] In this embodiment, the inner magnetic cylinder 302 and the outer magnetic cylinder 301 are connected and fixed by fasteners, which are not shown in the drawings, and are preferably screws.

[0027] Alternatively, in this embodiment, the permanent magnet 4 is a single, integral, and ring-shaped magnet, capable of providing continuous magnetic flux. In other embodiments, the permanent magnet 4 can also be a tile-shaped structure. In this case, multiple permanent magnets 4 are provided, arranged in a ring along the motor shaft 5. The tile-shaped permanent magnet 4 is easy to manufacture and can obtain multiple magnetic field combinations.

[0028] 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 split type permanent magnet brake comprising a permanent magnet, a stator, a moving plate and a rotor, the stator being composed of a magnetic yoke and a coil, characterized in that, The rotor is fixed on the motor shaft, the moving plate is clamped between the stator and the rotor, and the moving plate is fixed in the circumferential direction but can move in the axial direction; the rotor comprises an inner magnetic cylinder and an outer magnetic cylinder, and the permanent magnet is connected between the inner magnetic cylinder and the outer magnetic cylinder.

2. The split type permanent magnet brake according to claim 1, characterized by The outer magnetic cylinder is provided with an inner ring groove at one end close to the moving plate, the inner magnetic cylinder is arranged inside the inner ring groove, the permanent magnet is connected between the bottom of the inner ring groove and the end of the inner magnetic cylinder away from the moving plate, and a gap is left between the outer wall of the inner magnetic cylinder and the inner wall of the outer magnetic cylinder.

3. The split type permanent magnet brake according to claim 2, characterized by The inner magnetic cylinder is provided with an outer ring groove at one end close to the moving plate, and the end of the inner magnetic cylinder close to the moving plate is flush with the end of the outer magnetic cylinder close to the moving plate.

4. The split type permanent magnet brake according to claim 2, characterized by The inner magnetic cylinder and the outer magnetic cylinder are connected and fixed by fasteners.

5. The split type permanent magnet brake according to any one of claims 1 to 4, characterized in that, The permanent magnet is a magnetic steel.

6. The split type permanent magnet brake according to any one of claims 1 to 4, characterized by The permanent magnet is in the shape of a ring.

7. The split type permanent magnet brake according to any one of claims 1 to 4, characterized by The permanent magnet is in the shape of a tile, and a plurality of permanent magnets are distributed in a ring shape along the motor shaft.

8. The split type permanent magnet brake according to any one of claims 1 to 4, characterized by The rotor and the motor shaft are connected through a flange.

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