A torque limiting mechanism for disc-type permanent magnet speed controllers

Abstract

This invention discloses a torque limiting mechanism applicable to the field of disc-type permanent magnet speed regulation, relating to the field of permanent magnet speed regulation. It includes: a frame structure, a fixed pulley assembly, a movable pulley assembly, a flexible rope assembly, multiple elastic bodies, and multiple end cap structures. The frame structure is characterized by having a fixed pulley assembly, a movable pulley assembly, and multiple cavity structures, with the elastic bodies and end cap structures housed within the cavity structures. The flexible rope connects the elastic bodies, the fixed pulley assembly, the movable pulley assembly, and the outer rotating arm sleeve. By compressing the elastic bodies, tension is provided to the outer rotating arm sleeve, hindering its rotation and reducing the actuator's workload. The torque limiting mechanism disclosed in this invention can significantly improve the actuator's response speed to the speed regulation capability of the permanent magnet speed regulation system and optimize the actuator's transmission structure. It is particularly suitable for high-power permanent magnet speed regulators, with positive effects of improving system response speed and reducing actuator failure risk.

Description

Technical Field

[0001] This invention relates to the field of permanent magnet speed controller technology, and is applicable to disc-type permanent magnet speed controllers. Specifically, it relates to a mechanism for limiting the driving torque of the outer rotating arm sleeve of a disc-type permanent magnet speed controller. Background Technology

[0002] A permanent magnet speed controller is a new type of speed control transmission system. It changes the output speed of the system by changing the gap between the conductor rotor and the permanent magnet rotor, thereby changing the magnitude of the induced magnetic field generated on the conductor disk, and ultimately changing the magnitude of the transmittable torque.

[0003] When the disc-type permanent magnet speed controller is working, a huge magnetic force is generated between the permanent magnet disk and the conductor disk. This magnetic force is transmitted through the gear and rack mechanism on the intermediate disk structure, and is ultimately converted into an axial force acting on the outer rotating arm sleeve structure of the permanent magnet speed controller. The outer rotating arm sleeve structure then converts this axial force into rotational torque through a helical groove structure, which acts on the output shaft of the actuator. When the actuator is working, it needs to overcome the torque of the outer rotating arm sleeve before driving the outer rotating arm sleeve to rotate, thereby adjusting the gap between the permanent magnet disk and the conductor disk, and ultimately controlling the output speed of the motor.

[0004] Because the torque generated on the outer swing arm is enormous, it increases the output torque of the actuator and the selection cost, but also reduces the service life of the components in the speed regulation mechanism, which can easily lead to accident risks. Furthermore, it reduces the response speed and accuracy of the permanent magnet speed regulator to the actuator's actions, which is not conducive to the speed regulation control of the permanent magnet speed regulator.

[0005] In permanent magnet speed controllers with a design power exceeding 1500kW, the speed control mechanism often employs a worm gear and helical pair structure. By utilizing the worm gear's transmission ratio of tens to one, a large axial force can be generated with a relatively small actuator output torque to drive the permanent magnet disk axially. However, this speed control mechanism also significantly reduces the actuator's response speed and renders the manual adjustment function in actuators using this mechanism virtually unusable.

[0006] Therefore, reducing the torque of the outer swing arm sleeve is of great practical significance for the speed regulation function of the permanent magnet speed controller. Summary of the Invention

[0007] The purpose of this invention is to provide a torque limiting mechanism suitable for disc-type permanent magnet speed controllers. By applying a tensile force along the rotational tangent of the outer rotating arm sleeve structure in the permanent magnet speed controller, the torque of the outer rotating arm sleeve is reduced, thereby lowering the power consumption of the actuator and improving the actuator's lifespan and response accuracy. Depending on the selection of the elastomer, the torque of the outer rotating arm sleeve can be reduced by more than 80%.

[0008] This invention provides a torque limiting mechanism suitable for disc-type permanent magnet speed controllers, comprising a frame structure, a fixed pulley assembly, a movable pulley assembly, a flexible rope assembly, multiple elastic bodies, and multiple end cap structures. The frame structure is a cuboid, on which the fixed pulley assembly, movable pulley assembly, and multiple cavity structures are mounted. The elastic bodies and end cap structures are disposed within the cavity structures, with each cavity structure containing a single elastic body and a single end cap structure, and the number of elastic bodies or end cap structures is the same as the number of cavity structures. The flexible rope assembly includes multiple first flexible ropes and one second flexible rope. The first flexible rope passes through the elastic bodies and the frame structure, its traction direction is changed by the fixed pulley assembly, one end is connected to the end cap structure, and the other end is connected to the movable pulley assembly. The number of first flexible ropes is the same as the number of cavity structures. The second flexible rope is connected to the frame structure at one end, passes through the movable pulley assembly, and its other end is a free end.

[0009] Furthermore, the frame structure is equipped with a guide rail structure, and the movable pulley component can move along the direction defined by the guide rail structure. Moreover, the guide rail structure is located in the middle of the frame structure, and along the longer side of the frame structure, it symmetrically divides the multiple cavity structures into two groups.

[0010] Furthermore, the fixed pulley assembly includes a first fixed pulley assembly and a second fixed pulley assembly, wherein the first fixed pulley assembly and the second fixed pulley assembly are symmetrically arranged along the guide rail structure and have the same structure; on either side, one end of the elastic body contacts the inner wall of the cavity structure, and the other end contacts the end cap structure; the first flexible rope is connected to the end cap structure, passes through the elastic body and the frame structure, and then bypasses the first or second fixed pulley assembly to connect with the movable pulley assembly.

[0011] Furthermore, the movable pulley component also includes a movable pulley support structure, a movable pulley oil-free bushing, a movable pulley shaft, and a movable pulley. The movable pulley support structure can be inserted into the guide rail structure and can move along the axial direction of the guide rail structure.

[0012] At the top of the movable pulley support structure, in a direction perpendicular to the axis of the guide rail structure, there are two through holes. The movable pulley is connected to the movable pulley support structure through the movable pulley oil-free bushing and the movable pulley shaft.

[0013] The movable pulley support structure has three through holes along the axis of the guide rail structure. The three through holes are symmetrically arranged around the center of the slider. The two through holes on both sides are used to connect the first flexible rope and the movable pulley component. The middle through hole is through which the second flexible rope passes. One end is fixed to the frame structure, and the other end is wrapped around the movable pulley and is the free end.

[0014] Furthermore, the fixed pulley component also includes a fixed pulley support structure, a fixed pulley, and a fixed pulley oil-free bushing. The fixed pulley support structure has a "convex" shaped cross section, with the bottom serving as a flange for connection and fixation to the frame structure, and the top serving as a rotating shaft for mounting the fixed pulley and the fixed pulley oil-free bushing.

[0015] Furthermore, the free end of the second flexible rope is connected to a fixed support, which is connected to a rotating component of the target equipment. The free end of the second flexible rope can change its connection direction via one or more sets of fixed pulley components. When the free end moves, the second flexible rope can apply tension to a movable pulley component, causing it to move along the direction defined by the guide rail structure. Simultaneously, the direction of movement of the movable pulley component is opposite to the direction of compression of the elastic body.

[0016] Furthermore, the first or second flexible rope has a limiting sleeve at its end. After the flexible rope passes through the limiting sleeve, an external force is applied to squeeze the limiting sleeve, and the limiting sleeve is fixed to the flexible rope by deformation, so as to realize the connection between the flexible rope and the end cap structure or the movable pulley structure.

[0017] Furthermore, the frame structure is provided with a frame end cover, which is connected to the frame structure by bolts. The frame end cover has a through hole structure in the center. One end of the second flexible rope passes through the through hole structure and is connected to the frame end cover by a limiting sleeve.

[0018] Furthermore, the end cap structure is circular with a through hole in the center. One end of the first flexible rope passes through the through hole, and the limiting sleeve is provided at its end.

[0019] The present invention provides a torque limiting mechanism suitable for a disc-type permanent magnet speed controller, characterized by the following implementation process:

[0020] The outer rotating arm sleeve of the permanent magnet speed controller is equipped with a fixed support, which is connected to the free end of the second flexible rope. When the permanent magnet speed controller is working, the outer rotating arm sleeve rotates under the drive of the actuator, pulling the second flexible rope, which in turn pulls the movable pulley component to move. Simultaneously, the movable pulley component moves, and through the first flexible rope connected to it, the elastic body within the compressor frame structure provides resistance, hindering the movement of the movable pulley. The elastic force provided by the elastic body is ultimately converted into a tension force along the rotational tangent of the outer rotating arm sleeve, hindering the rotation of the outer rotating arm sleeve structure. That is, a reverse torque is provided to the permanent magnet speed control mechanism, thereby reducing the rotational torque generated by the magnetic field attraction.

[0021] During the operation of the permanent magnet speed controller, the torque of the outer rotating arm sleeve is reduced, which can directly reduce the power of the actuator output torque, improve the response speed of the permanent magnet speed controller to the actuator action, reduce the stress on the components in the speed control mechanism, and have the positive effects of increasing the service life of the components and improving the stability, reliability and response accuracy of the system. Attached Figure Description

[0022] Figure 1 Axial view of the torque limiting mechanism applicable to a disc-type permanent magnet speed controller;

[0023] Figure 2 Main view of the torque limiting mechanism applicable to a disc-type permanent magnet speed controller;

[0024] Figure 3 A sectional view (side section) of the torque limiting mechanism applicable to a disc-type permanent magnet speed controller;

[0025] Figure 4 A cross-sectional view (horizontal section) of a torque limiting mechanism applicable to a disc-type permanent magnet speed controller;

[0026] Figure 5 A sectional view of the fixed pulley assembly of the torque limiting mechanism applicable to a disc-type permanent magnet speed controller;

[0027] Figure 6 This is the front view of the movable pulley component;

[0028] Figure 7 This is a sectional view (side section) of the movable pulley component;

[0029] Figure 8 This is a cross-sectional view (horizontal section) of the movable pulley component;

[0030] Figure 9 This is the main view of the frame structure;

[0031] Figure 10 This is a cross-sectional view (horizontal section) of the frame structure;

[0032] Figure 11 This is a sectional view (side section) of the frame structure;

[0033] Figure 12 View of the frame end cap;

[0034] Figure 13 An assembly shaft view of the torque limiting mechanism and outer rotating arm sleeve structure applicable to disc-type permanent magnet speed controllers;

[0035] Figure 14 Side view of the assembly of the torque limiting mechanism and the outer rotating arm sleeve structure applicable to disc permanent magnet speed controller;

[0036] Figure 15This describes the assembly relationship between a permanent magnet speed controller and a torque limiting mechanism suitable for a disc-type permanent magnet speed controller. Detailed Implementation

[0037] like Figures 1-5 As shown, the torque limiting mechanism for disc-type permanent magnet speed controllers provided by the present invention consists of a frame structure 1, a first fixed pulley component 2.1, a second fixed pulley component 2.2, a movable pulley component 3, a first flexible rope 4.1, a second flexible rope 4.2, an elastic body 5, and an end cap structure 6.

[0038] like Figures 3-4 and Figures 9-11 As shown, the frame structure 1 has a guide rail structure 1.2 and a cavity structure 1.3 inside. The movable pulley component 3 can move freely along the direction set by the guide rail structure 1.2. The cavity structure 1.3 is symmetrically distributed on both sides of the frame structure 1 with the axis of the guide rail structure 1.2 as the axis of symmetry. The elastic body 5 and the end cap structure 6 are placed in the cavity structure 1.3 of the frame structure 1, and there is one elastic body 5 and one end cap structure 6 in each cavity structure 1.3. In this example, the frame structure 1 has two cavity structures 1.2. Without considering the size of the frame structure 1, multiple cavity structures 1.3 and corresponding elastic bodies 5 and end cap structures 6 can be designed to provide greater elasticity.

[0039] like Figure 5 As shown, either the first fixed pulley component 2.1 or the second fixed pulley component 2.2 consists of a fixed pulley support structure 2.3, a fixed pulley 2.4, and a fixed pulley oil-free bushing 2.5. The fixed pulley 2.4 is connected to the fixed pulley support structure 2.3 via the fixed pulley oil-free bushing 2.5, and the fixed pulley 2.4 can rotate freely. The fixed pulley 2.4 has a radial groove, and the first flexible rope 4.1 passes around the fixed pulley 2.4 and is secured in the groove of the fixed pulley 2.4.

[0040] like Figure 6-8 As shown, the movable pulley component 3 consists of a movable pulley support structure 3.1, a movable pulley 3.2, a movable pulley oil-free bushing 3.3, and a movable pulley shaft 3.4. The movable pulley 3.2 is connected to the movable pulley shaft 3.4 via the movable pulley oil-free bushing, and the movable pulley 3.2 can rotate freely. The movable pulley support structure 3.1 can be inserted into the guide rail structure 1.2, allowing the movable pulley component 3 to move freely within the guide rail structure 1.2 under the action of lubricating grease. A radial groove is provided on the movable pulley 3.2, and a second flexible rope 4.2 passes around the movable pulley 3.2 and is secured within the groove.

[0041] like Figure 4As shown, one end of the first flexible rope 4.1 passes through the end cap structure 6, and the other end first passes through the elastic body 5 and the frame structure 1, then around the fixed pulley 2.4, and finally through the movable pulley support structure 3.1. Both ends of the first flexible rope 4.1 are equipped with limiting sleeves 7, which are fixedly connected to both ends of the first flexible rope 4.1 by compression deformation. After installation, one end of the first flexible rope 4.1 is connected to the end cap structure 6, and the other end is connected to the movable pulley component 3.

[0042] like Figure 12 As shown, the frame end cover 1.1 is a flat plate structure with a through hole in the center. One end of the second flexible rope 4.2 passes through this through hole and is then limited by a limiting sleeve 7. In this embodiment, the frame end cover 1.1 is connected to the frame structure 1 by bolts. A boss structure is provided at the position of the end cover structure 1.1 corresponding to the cavity structure 1.3. This boss structure can adjust the locking bolts of the frame end cover to appropriately pre-compress the elastic body 5, thereby changing the initial working elastic force of the elastic body 5 to match the working torque required by the specific permanent magnet speed controller. In other embodiments, if the adjustment of the initial compression of the elastic body 5 is not considered, the frame end cover 1.1 can be omitted. Instead, a closed end face with a through hole can be provided on the end face of the guide rail structure 1.2 that was originally used to fix the frame end cover 1.1. The non-free end of the second flexible rope 4.2 passes through this through hole and is connected to the limiting sleeve 7 to achieve the same effect.

[0043] like Figure 3 and Figure 13 As shown, one end of the second flexible rope 4.2 passes through the frame end cover 1.1, and the other end passes through the movable pulley support structure 3.1, then around the movable pulley 3.2, and is connected to the fixed support 9 under the guidance of the guide pulley 8. The fixed support 9 is connected to the outer rotating arm sleeve 10 in the permanent magnet speed controller. The guide pulley allows the second flexible rope 4.2 to maintain its tension direction tangentially to the outer rotating arm sleeve 10 within a large stroke range.

[0044] like Figure 13 , Figure 14 and 15As shown, when the permanent magnet speed controller is working, the conductor disk 13 is fixed to the motor shaft, and a magnetic force is generated between the permanent magnet disk 12 and the conductor disk 13. This magnetic force is converted into axial force through the traditional permanent magnet speed controller transmission structure, and finally into the rotational torque of the outer rotating arm sleeve 10 through the spiral groove structure 11. Due to the presence of the magnetic force, the outer rotating arm sleeve 10 always has a tendency to rotate. When the actuator is working, it needs to overcome the rotational tendency of the outer rotating arm sleeve 10 to adjust the gap between the permanent magnet disk 12 and the conductor disk 13. After the torque limiting mechanism suitable for disc-type permanent magnet speed controllers is added, the elasticity of the elastic body 5 can be used to offset most of the torque on the outer rotating arm sleeve 10, thereby reducing the demand on the actuator output torque. With appropriate design selection, the actuator output torque can be effectively reduced by more than 80%, thereby reducing the equipment cost of the permanent magnet speed controller and improving the system response speed of the permanent magnet speed controller.

[0045] As the magnetic force between the permanent magnet disk 12 and the conductor disk 13 gradually intensifies, the fixed support 9 connected to the outer rotating arm sleeve 10, under the tension of the second flexible rope 4.2, drives the movable pulley component 3 to move along the guide rail structure 1.2 in the stretching direction of the second flexible rope 4.2. At this time, the elastic body 5 can provide a set of preset elastic forces, which, through the first flexible rope 4.1 and the first fixed pulley component 2.1 or the second fixed pulley component 2.2, convert the elastic forces into the tension of the second flexible rope 4.2, acting on the movable pulley component 3 to prevent its movement, thereby limiting the torque of the outer rotating arm sleeve 10. By selecting a suitable elastic body 5, the torque of the outer rotating arm sleeve 10 can be effectively reduced by more than 80%.

Claims

1. A torque limiting mechanism suitable for a disc-type permanent magnet speed controller, comprising a frame structure, a fixed pulley assembly, a movable pulley assembly, a flexible rope assembly, multiple elastic bodies, and multiple end cap structures, characterized in that, The frame structure is a cuboid, on which a fixed pulley assembly, a movable pulley assembly, and multiple cavity structures are arranged. The elastic body and end cap structure are disposed within the cavity structures, with each cavity structure containing a single elastic body and a single end cap structure. The number of elastic bodies or end cap structures is the same as the number of cavity structures. The flexible rope assembly includes multiple first flexible ropes and one second flexible rope. The first flexible rope passes through the elastic body and the frame structure. The traction direction of the first flexible rope is changed by the fixed pulley assembly. One end of the first flexible rope is connected to the end cap structure, and the other end is connected to the movable pulley assembly. The number of first flexible ropes... The quantity is the same as the number of cavity structures; one end of the second flexible rope is connected to the frame structure, passes through the movable pulley component, and the other end is a free end. The outer rotating arm sleeve of the permanent magnet speed controller is provided with a fixed support, which is connected to the free end of the second flexible rope. When the permanent magnet speed controller is working, the outer rotating arm sleeve rotates under the drive of the actuator, pulling the second flexible rope. The second flexible rope pulls the movable pulley component to move. At the same time as the movable pulley component moves, the elastic body in the frame structure provides resistance through the first flexible rope connected to it, which hinders the movement of the movable pulley. The elastic force provided by the elastic body is converted into a tension force along the rotation tangent direction of the outer rotating arm sleeve, which hinders the rotation of the outer rotating arm sleeve structure.

2. The torque limiting mechanism for a disc-type permanent magnet speed controller as described in claim 1, characterized in that, The frame structure is provided with a guide rail structure, the movable pulley component moves along the direction defined by the guide rail structure, and the guide rail structure is located in the middle of the frame structure, symmetrically dividing the multiple cavity structures into two groups along the longer side of the frame structure.

3. The torque limiting mechanism for a disc-type permanent magnet speed controller as described in claim 2, characterized in that, The fixed pulley assembly includes a first fixed pulley assembly and a second fixed pulley assembly, which are symmetrically arranged along the guide rail structure and have identical structures. On either side, one end of the elastic body contacts the inner wall of the cavity structure, and the other end contacts the end cap structure. The first flexible rope is connected to the end cap structure, passes through the elastic body and the frame structure, and then bypasses the first or second fixed pulley assembly to connect with the movable pulley assembly.

4. The torque limiting mechanism for a disc-type permanent magnet speed controller as described in claim 2, characterized in that, The movable pulley component further includes a movable pulley support structure, a movable pulley oil-free bushing, a movable pulley shaft, and a movable pulley. The movable pulley support structure is inserted into the guide rail structure and can move along the axial direction of the guide rail structure. Two through holes are provided at the top of the movable pulley support structure, perpendicular to the axis of the guide rail structure. The movable pulley is connected to the movable pulley support structure via the movable pulley oil-free bushing and the movable pulley shaft. The movable pulley support structure has three through holes along the axis of the guide rail structure, symmetrically arranged around the center of the slider. The two through holes on either side are used to connect the first flexible rope and the movable pulley component. The middle through hole is through which the second flexible rope passes, with one end fixed to the frame structure and the other end wrapped around the movable pulley, serving as the free end.

5. A torque limiting mechanism for a disc-type permanent magnet speed controller as described in claim 3, characterized in that, The fixed pulley assembly also includes a fixed pulley support structure, a fixed pulley, and a fixed pulley oil-free bushing. The fixed pulley support structure has a "convex" cross-section, with the bottom serving as a flange for connection and fixation to the frame structure, and the top serving as a pivot for mounting the fixed pulley and the fixed pulley oil-free bushing.

6. A torque limiting mechanism for a disc-type permanent magnet speed controller as described in claim 1, characterized in that, The free end of the second flexible rope is connected to a fixed support, which is connected to the rotating component of the permanent magnet speed regulator. The free end of the second flexible rope can change its connection direction through one or more sets of fixed pulley components. When the free end moves, the second flexible rope can apply tension to the movable pulley component, causing it to move along the direction defined by the guide rail structure. At the same time, the direction of movement of the movable pulley component is opposite to the direction of compression of the elastic body.

7. A torque limiting mechanism for a disc-type permanent magnet speed controller as described in claim 1, characterized in that, The end of the first or second flexible rope is provided with a limiting sleeve. After the flexible rope passes through the limiting sleeve, an external force is applied to squeeze the limiting sleeve. The limiting sleeve is fixed to the flexible rope by means of deformation, so as to realize the connection between the flexible rope and the end cap structure or the movable pulley structure.

8. A torque limiting mechanism for a disc-type permanent magnet speed controller as described in claim 7, characterized in that, The end cap structure is circular with a through hole in the center. One end of the first flexible rope passes through the through hole, and a limiting sleeve is provided at the end of the end cap structure.

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