Permanent magnet brake disc for electromagnetic brake

Abstract

The utility model discloses a permanent magnetic force brake disc for electromagnetic brake, including annular brake disc body and brake disc permanent magnet, one side surface of brake disc body is equipped with annular friction piece, and the other side surface is equipped with a plurality of along the circumferential direction evenly distributed mortises and is installed with one brake disc permanent magnet in each mortise, and one of two magnetic poles of brake disc permanent magnet far from the end of friction piece is one magnetic pole. The utility model discloses install multiple brake disc permanent magnets in brake disc body, can produce repulsion or attraction with other components of electromagnetic brake such as armature or the permanent magnet or electromagnetic part in the groove disc cooperation, and cooperate the function of braking and unbraking of solenoid, because the magnetic force of permanent magnet will not change because of the increase of use time, so avoid the problem of the reduction of spring force of traditional compression spring long -term use, can keep brake torque unchanged after long -term use.

Description

Technical Field

[0001] This utility model relates to an electromagnetic brake component, and more particularly to a permanent magnet brake disc for use in an electromagnetic brake. Background Technology

[0002] Electromagnetic brakes are widely used in various electromechanical equipment to achieve braking and de-braking functions. For example, the joint modules of humanoid robots require electromagnetic brakes. With the application of humanoid robots, issues of stability and safety have arisen. Specifically, humanoid robots need to brake smoothly in the event of sudden power loss, loss of control, or overload, ensuring the safety of surrounding personnel and property. Therefore, higher requirements are placed on the braking torque and dynamic smooth control of electromagnetic brakes in humanoid robots. Simultaneously, the multiple drive joints and sensors of humanoid robots need to be connected through internal wiring harnesses, requiring each component to have a sufficiently large hollow dimension to accommodate the wiring. Furthermore, the symmetrical structure and lightweight design requirements of humanoid robots also necessitate that components be symmetrical and weight-reduced.

[0003] The brake disc is one of the main components of an electromagnetic brake. It is rotatably connected to the drive shaft and can move axially relative to it. The brake disc is in a stopped state when it is pushed against the cover plate by a spring or other force, which is the braking state; otherwise, it is in the released state. Traditional electromagnetic brakes mainly rely on a spring installed in the slot to achieve the function of pressing the armature and the traditional brake disc together. This type of traditional electromagnetic brake has problems such as the spring force weakening over time, the need for cooperation with the armature making it difficult to further reduce the product thickness, and the small friction surface area between the friction pads on the traditional brake disc and the cover plate, which requires a reduction in the hollow diameter to ensure braking, thus hindering wire threading. To solve these problems, the traditional brake disc must be improved. Utility Model Content

[0004] The purpose of this invention is to provide a permanent magnet brake disc for electromagnetic brakes in order to solve the above-mentioned problems.

[0005] This utility model achieves the above objectives through the following technical solutions: A permanent magnet brake disc for an electromagnetic brake includes an annular brake disc body and a brake disc permanent magnet. An annular friction pad is mounted on one side surface of the brake disc body, and a plurality of countersunk holes are provided on the other side surface, which are evenly distributed along the circumference. Each countersunk hole contains one of the brake disc permanent magnets. One end of the brake disc permanent magnet that is away from the friction pad is one of its two magnetic poles.

[0006] Preferably, in order to increase the friction area between the brake disc body and the electromagnetic brake cover plate without increasing the radial dimension to achieve a larger braking torque and at the same time have a larger hollow diameter, the surface of the friction pad away from the brake disc body is an inclined plane and the inclined plane has an angle of 60°-85° with the center line of the brake disc body.

[0007] Preferably, in order to fit more closely with the slot of the electromagnetic brake and reduce the radial dimension occupied by the slot and the brake disc body to have a larger hollow diameter, the outer wall of the brake disc body on the side away from the friction pad is provided with a relief groove with an "L" shaped cross section, and the multiple countersunk holes for installing multiple brake disc permanent magnets are all located at the bottom of the relief groove.

[0008] Preferably, in order to achieve a rotary transmission connection with the drive shaft, the central through hole wall of the brake disc body is provided with multiple keyways.

[0009] The beneficial effects of this utility model are as follows: This invention, by installing multiple permanent magnets within the brake disc body, can generate repulsive or attractive forces in conjunction with other components of the electromagnetic brake, such as the armature or permanent magnets or electromagnetic components in the slotted disc, and achieve braking and releasing functions in conjunction with the electromagnetic coil. Since the magnetic force of the permanent magnets does not change with usage time, it avoids the problem of reduced elasticity of traditional compression springs over long-term use, maintaining a constant braking torque. Using one permanent magnet brake disc, one cover plate, and one slotted disc with built-in permanent magnets, an electromagnetic brake without an armature can be formed, thus reducing product thickness. Using two permanent magnet brake discs, two cover plates, and one slotted disc with built-in permanent magnets, a symmetrical electromagnetic brake without an armature can be formed, eliminating the need to distinguish between the front and back sides during installation and improving installation efficiency. By designing the outer surface of the friction pad as a beveled plane, the friction surface area between the friction pad and the cover plate can be increased, reducing the hollow diameter while ensuring braking torque, thus facilitating wire threading applications. Attached Figure Description

[0010] Figure 1 This is a perspective view of the permanent magnet brake disc for electromagnetic brakes described in this utility model; Figure 2 This is a top view of the permanent magnet brake disc for electromagnetic brakes described in this utility model; Figure 3 yes Figure 2 Enlarged AA section view in the image; Figure 4 This is a perspective view of the electromagnetic brake based on a permanent magnet in an application embodiment of this utility model; Figure 5This is a top view of the electromagnetic brake based on a permanent magnet in an application embodiment of this utility model; Figure 6 yes Figure 5 Enlarged cross-sectional view of BB in the image. Detailed Implementation

[0011] The present invention will be further described below with reference to the accompanying drawings and application embodiments: like Figures 1-3 As shown, the permanent magnet brake disc for electromagnetic brakes of this utility model includes an annular brake disc body 2 and a brake disc permanent magnet 1. An annular friction pad 3 is installed on one side surface of the brake disc body 2, and multiple countersunk holes (not marked in the figure) are evenly distributed along the circumference on the other side surface. Each countersunk hole contains a brake disc permanent magnet 1. The end of the brake disc permanent magnet 1 away from the friction pad 3 is one of its two magnetic poles (i.e., the N pole or the S pole).

[0012] like Figures 1-3 As shown, this utility model also discloses the following more optimized specific structures: In order to increase the cover plate of the brake disc body 2 and the electromagnetic brake without increasing the radial dimension (see reference) Figures 4-6 The friction area between the cover plates 7) is increased to achieve a larger braking torque and a larger hollow diameter. The surface of the friction pad 3 away from the brake disc body 2 is an inclined plane 6 and the inclined plane 6 has an angle of 60°-85° with the center line of the brake disc body 2, preferably 70°-80°.

[0013] In order to be compatible with the slot of the electromagnetic brake (reference) Figure 4 and Figure 6 The groove 10) fits more closely to reduce the radial dimension occupied by the groove and the brake disc body 2 so as to have a larger hollow diameter. The outer wall of the brake disc body 2 away from the friction plate 3 is provided with a relief groove 4 with an "L" shaped cross section. The multiple countersunk holes for installing multiple brake disc permanent magnets 1 are all provided at the bottom of the relief groove 4.

[0014] In order to achieve a rotary transmission connection with the drive shaft, the central through hole wall of the brake disc body 2 is provided with multiple keyways 5.

[0015] To demonstrate the preferred application of this utility model and illustrate its advantages, a preferred application embodiment will be described in detail below.

[0016] Application Examples: The two permanent magnet brake discs described in this utility model, together with a slot 11 containing a built-in slotted permanent magnet 14 and two cover plates 8, form a... Figures 4-6 The preferred specific structure of the electromagnetic brake based on a permanent magnet shown is as follows: like Figures 1-6 As shown, the permanent magnet-based electromagnetic brake includes a slotted disc 11, two permanent magnet brake discs, and two cover plates 8. The two brake disc bodies 2 are located on the outer sides of the slotted disc 11, and the two cover plates 8 are located on the outer sides of the two brake disc bodies 2. The slotted disc 11 contains multiple electromagnetic coils (not shown in the figure) and multiple slotted disc permanent magnets 14. The multiple electromagnetic coils are evenly distributed along the circumference and are located on the same circumference of the same virtual circle as the multiple slotted disc permanent magnets 14. The two ends of the slotted disc permanent magnets 14 are poles, and the line connecting the two ends is parallel to the center line of the slotted disc 11. The multiple slotted disc permanent magnets 14 are respectively installed in multiple through holes in the slotted disc 11. Multiple grooves are provided on both sides of the slotted disc 11, and an electromagnetic coil is installed in each groove. An electromagnetic coil is installed between every two adjacent slotted disc permanent magnets 14. Multiple electromagnetic coils located on the same side of the slotted disc 11 are arranged in a specific manner. The coils are arranged sequentially at intervals in the circumferential direction. The two adjacent electromagnetic coils on both sides of the slot 11 are staggered in the circumferential direction. The edge of the slot 11 is provided with a plurality of slot connection lugs 13 that protrude outward in the circumferential direction and are evenly distributed in the circumferential direction. The slot connection lugs 13 are provided with connecting screw holes (not marked in the figure). The edge of the slot 11 is provided with a plurality of slot mounting lugs 12 that protrude outward in the circumferential direction and are evenly distributed in the circumferential direction. The slot mounting lugs 12 are provided with mounting through holes (not marked in the figure). The plurality of slot mounting lugs 12 and the plurality of slot connection lugs 13 are evenly distributed in the same circumferential direction. The edge of the cover plate 8 is provided with a plurality of cover plate connection lugs 9 that protrude outward in the circumferential direction and are evenly distributed in the circumferential direction. The plurality of connecting screws 7 located on both sides of the slot 11 pass through the through holes on the plurality of cover plate connection lugs 9 and are connected to the plurality of connecting screw holes on the plurality of slot connection lugs 13. Figure 4 and Figure 6 The image also shows a bushing 10 located outside the connecting screw 7 and between the cover plate 8 and the slotted plate 11.

[0017] When the aforementioned electromagnetic brake based on permanent magnets is used, it is mounted on the relevant power components of the application equipment, such as a robot, through multiple slotted mounting lugs 12. It forms a circumferential transmission connection structure with the transmission shaft (such as the transmission shaft connected to the motor shaft) through the keyway 5 of the brake disc body 2, and the brake disc body 2 and the transmission shaft can move axially relative to each other.

[0018] When the robot's power components need to be released from braking and operate normally, the electromagnetic coil is energized to generate a magnetic field, which produces an electromagnetic attraction on the brake disc permanent magnet 1 and the brake disc body 2. By controlling the magnitude of the current in the electromagnetic coil or / the number of energized electromagnetic coils, the electromagnetic attraction on the brake disc body 2 is made just enough to overcome the permanent magnetic repulsion between the multiple slotted permanent magnets 14 and the multiple brake disc permanent magnets 1, so that the brake disc body 2 is located between the slotted plate 11 and the corresponding cover plate 8 with a gap, and the brake disc body 2 can rotate freely synchronously with the drive shaft. At this time, the electromagnetic brake is in the released braking state.

[0019] When the robot's relevant power components need to stop rotating to complete timely braking, the electromagnetic field of the electromagnetic coil disappears, the electromagnetic attraction on the brake disc permanent magnet 1 and brake disc body 2 disappears, and the permanent magnetic repulsion between the multiple slotted permanent magnets 14 and the multiple brake disc permanent magnets 1 on both sides presses the brake disc body 2 tightly against the corresponding cover plate 8. A strong frictional force is generated between the friction plate 3 and the corresponding cover plate 8, and the brake disc body 2 can no longer rotate and stops quickly, driving the transmission shaft to stop synchronously. At this time, the electromagnetic brake is in the braking state.

[0020] In practical applications, the power components of a robot may require different braking torques to meet various functional needs. Therefore, it is necessary to adjust the braking torque. The wider the adjustment range and the more torque values, the broader its applicability. The braking torque adjustment principle of this electromagnetic brake is as follows: Multiple (six in the figure) electromagnetic coils are installed on both sides of the slot 11. The power supply and current of each electromagnetic coil can be controlled individually. When all electromagnetic coils are de-energized, the braking torque corresponding to the total permanent magnetic repulsion between all the slot permanent magnets 14 and all the brake disc permanent magnets 1 on both sides is the initial braking torque. When the actual required braking torque is lower than the initial braking torque, some or all of the electromagnetic coils can be energized and a suitable current can be set. At this time, the electromagnetic attraction generated by the energized electromagnetic coils cannot completely overcome the total permanent magnetic repulsion but can cancel it out. As a result, the friction between the friction pad 3 and the corresponding cover plate 8 decreases due to the reduced pressure on the brake disc body 2, thereby reducing the actual braking torque. When the actual required braking torque is higher than the initial braking torque, some or all of the electromagnetic coils can be reverse-energized and a suitable current can be set. At this time, the energized electromagnetic coils generate electromagnetic repulsion on the brake disc body 2 and the brake disc permanent magnet 1. This electromagnetic repulsion is superimposed on the total permanent magnet repulsion, causing the friction between the friction pad 3 and the corresponding cover plate 8 to increase due to the increased pressure on the brake disc body 2, thereby increasing the actual braking torque.

[0021] The above embodiments are merely preferred embodiments of this utility model and are not intended to limit the technical solutions of this utility model. Any technical solution that can be implemented based on the above embodiments without creative effort should be considered to fall within the scope of protection of this utility model patent.

Claims

1. A permanent magnetic force brake disc for an electromagnetic brake, comprising a circular ring shaped brake disc body, characterized in that: It also includes a brake disc permanent magnet. A circular friction pad is installed on one side surface of the brake disc body, and multiple countersunk holes are evenly distributed along the circumference on the other side surface. Each countersunk hole contains one of the brake disc permanent magnets. The end of the brake disc permanent magnet that is away from the friction pad is one of its two magnetic poles.

2. A permanent magnetic braking disc for an electromagnetic brake according to claim 1, characterized in that: The surface of the friction pad away from the brake disc body is an inclined plane, and the inclined plane has an angle of 60°-85° with the center line of the brake disc body.

3. The permanent magnet brake disc for an electromagnetic brake according to claim 1 or 2, characterized in that: The outer wall of the brake disc body away from the friction pad is provided with an "L"-shaped relief groove, and the multiple countersunk holes for installing multiple brake disc permanent magnets are all located at the bottom of the relief groove.

4. The permanent magnet brake disc for an electromagnetic brake according to claim 1 or 2, characterized in that: The central through hole of the brake disc body has multiple keyways on its wall.

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