armature, electromagnetic brake, motor

Abstract

The application provides a armature, electromagnetic brake and motor, wherein the armature comprises a body, the body has a first end face, a friction surface is formed around the body on the first end face, a first dust storage groove and / or a second dust storage groove are arranged around the body on the first end face, the first dust storage groove is located on the outer side of the friction surface along the radial direction of the body, the second dust storage groove is located on the inner side of the friction surface, and the first dust storage groove and / or the second dust storage groove are adjacent to the friction surface. According to the application, when the armature is applied to the electromagnetic brake, and the electromagnetic brake is in the braking state, the dust generated in the friction process between the friction plate and the friction surface of the armature can be stored in the inner and outer dust storage grooves, so that the dust entering between the contact surfaces of the friction plate and the armature can be significantly reduced, thereby alleviating the condition that the dust affects the friction torque of the electromagnetic brake and causes the braking effect of the brake to be poor.

Description

Technical Field

[0001] This invention belongs to the field of motor technology, specifically relating to an armature, an electromagnetic brake, and a motor. Background Technology

[0002] Electromagnetic brakes for electric motors typically include components such as an iron core, coil, coil frame, spring, elastic cylindrical pin, armature, friction pads, and hub. In existing electromagnetic brakes, the friction pads collide with the armature during braking, inevitably generating dust during this friction process. For example... Figure 8 As shown, since the armature is a relatively regular disc-shaped structure, it cannot store the generated dust in time. Therefore, the dust will enter the contact surface between the friction plate and the armature, which will affect the friction torque of the electromagnetic brake and result in poor braking effect. Summary of the Invention

[0003] Therefore, the present invention provides an armature that can solve the technical problem that in existing electromagnetic brakes, when braking, the friction pad comes into contact with the armature, and dust is inevitably generated during the mutual friction process. Since the dust has nowhere to be stored, it enters the contact surface between the friction pad and the armature, which affects the friction torque of the electromagnetic brake and leads to poor braking effect.

[0004] To address the aforementioned problems, the present invention provides an electromagnetic brake, comprising: a body having a first end face, a friction surface forming around the body on the first end face, and a first dust storage groove and / or a second dust storage groove being constructed around the body on the first end face. Along the radial direction of the body, the first dust storage groove is located outside the friction surface, the second dust storage groove is located inside the friction surface, and both the first dust storage groove and / or the second dust storage groove are adjacent to the friction surface.

[0005] In some embodiments, the first dust storage tank has a first side wall surrounding the body, the first side wall being away from the friction surface and extending to the opening of the first dust storage tank, the body having a central axis, and the first side wall gradually tilting away from the central axis in the direction from the bottom of the first dust storage tank to the opening of the first dust storage tank.

[0006] In some embodiments, a first recessed area is also formed on the first end face, surrounding itself, and the first recessed area is located outside the first dust storage tank along the radial direction of the body.

[0007] In some embodiments, the first recessed area is adjacent to the first dust storage tank; and / or, the first recessed area extends to the edge of the body; and / or, a first step structure is provided in the first recessed area, the first step structure being located on the side of the first recessed area away from the edge of the body.

[0008] In some embodiments, the bottom wall of the second dust storage tank is provided with a plurality of through holes, each of the through holes being distributed at intervals along the circumference of the second dust storage tank, and each of the through holes penetrating the body.

[0009] In some embodiments, a second recessed area is also formed on the first end face, surrounding itself, and the second recessed area is located inside the second dust storage tank along the radial direction of the body.

[0010] In some embodiments, the second recessed area has a second sidewall surrounding the body, the body having a central axis, and the second sidewall gradually inclined away from the central axis in the direction from the bottom of the second dust storage tank to the opening of the second dust storage tank; the second dust storage tank has a third sidewall and a fourth sidewall surrounding the body, the third sidewall being in contact with the second sidewall, the fourth sidewall being in contact with the friction surface, and the height of the fourth sidewall being greater than the height of the third sidewall along the axial direction of the body.

[0011] In some embodiments, the body has a shaft hole located inside the second recessed region along the radial direction of the body, and the second recessed region extends to communicate with the shaft hole; and / or, a second step structure is provided in the second recessed region, located inside the second sidewall along the radial direction of the body.

[0012] The present invention also provides an electromagnetic brake, comprising the armature described above.

[0013] In some embodiments, the electromagnetic brake further includes a friction pad and a hub, the friction pad being located between the body and the hub and connected to the hub, the electromagnetic brake having a non-braking state, wherein when the electromagnetic brake is in the non-braking state, there is a distance L between the friction pad and the friction surface, 0.05mm≤L≤0.15mm.

[0014] The present invention also provides an electric motor, including the electromagnetic brake described above.

[0015] The present invention provides an armature, an electromagnetic brake, and a motor, which have the following beneficial effects:

[0016] When the armature of this application is applied in an electromagnetic brake, and the electromagnetic brake is in a braking state, the friction pads inside will abut against the friction surface of the armature for friction braking. Since the armature body is provided with a first dust storage groove and a second dust storage groove, and along the radial direction of the body, the first and second dust storage grooves are located radially outside and radially inside the friction surface, respectively, the dust generated during the friction between the friction pads and the armature will enter and be stored in the two dust storage grooves. This significantly reduces the amount of dust entering the contact surface between the friction pads and the armature, thereby alleviating the situation where dust affects the friction torque of the electromagnetic brake, leading to poor braking performance. Simultaneously, the arrangement of the first and second dust storage grooves also increases the contact area between the armature and the air, thereby enhancing the heat exchange effect of the armature. Attached Figure Description

[0017] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the armature structure according to an embodiment of the present invention;

[0019] Figure 2 This is a first visual cross-sectional view of the electromagnetic brake according to an embodiment of the present invention;

[0020] Figure 3 for Figure 2 Enlarged schematic diagram of point A of the electromagnetic brake in this embodiment of the invention;

[0021] Figure 4 for Figure 2 An enlarged schematic diagram of point B of the electromagnetic brake in an embodiment of the present invention;

[0022] Figure 5 This is a second visual cross-sectional view of the electromagnetic brake according to an embodiment of the present invention;

[0023] Figure 6 This is an exploded view of the electromagnetic brake according to an embodiment of the present invention;

[0024] Figure 7 This is a schematic diagram of the structure of the electromagnetic brake according to an embodiment of the present invention;

[0025] Figure 8 This is an exploded schematic diagram of an existing electromagnetic brake.

[0026] The reference numerals in the attached figures are as follows:

[0027] 1. Body; 2. Friction surface; 3. First dust storage tank; 4. Second dust storage tank; 5. First side wall; 6. First recessed area; 7. First stepped structure; 8. Through hole; 9. Second recessed area; 10. Second side wall; 11. Second stepped structure; 12. Friction plate; 13. Hub; 14. Iron core; 15. Coil; 16. Coil frame; 17. Spring; 18. Elastic cylindrical pin; 19. Flat key. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0030] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0031] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0032] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0033] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0034] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0035] See also Figures 1 to 8As shown, according to an embodiment of the present invention, an armature is provided, comprising: a body 1, the body 1 having a first end face, a friction surface 2 forming around the body 1 on the first end face, a first dust storage groove 3 and / or a second dust storage groove 4 forming around the body 1 on the first end face, the first dust storage groove 3 being located outside the friction surface 2 along the radial direction of the body 1, the second dust storage groove 4 being located inside the friction surface 2, and both the first dust storage groove 3 and / or the second dust storage groove 4 being adjacent to the friction surface 2.

[0036] In this technical solution, when the armature of this application is applied in an electromagnetic brake and the electromagnetic brake is in a braking state, the friction plate 12 inside it will abut against the friction surface of the armature for friction braking. Since the armature body 1 is provided with a first dust storage groove 3 and a second dust storage groove 4, and along the radial direction of the body 1, the first dust storage groove 3 and the second dust storage groove 4 are respectively located on the radial outer side and radial inner side of the friction surface, the dust generated during the mutual friction between the friction plate 12 and the armature will enter the inner and outer dust storage grooves and be stored. This can significantly reduce the amount of dust entering between the contact surface of the friction plate 12 and the armature, thereby alleviating the situation where dust affects the friction torque of the electromagnetic brake, resulting in poor braking effect. At the same time, the arrangement of the first dust storage groove 3 and the second dust storage groove 4 also increases the contact area between the armature and the air, thereby enhancing the heat exchange effect of the armature. Both the armature and the friction plate 12 have shaft holes through which the motor shaft passes. Therefore, during the friction braking process, dust will be generated on both the radially outer and radially inner sides of the friction surface 2. By constructing only the first dust storage groove 3 or the second dust storage groove 4 on the first end face, the dust on the radially outer or radially inner side of the friction surface 2 can be collected separately, thereby improving the poor braking effect of the brake. However, when the first dust storage groove 3 and the second dust storage groove 4 are constructed on the radially outer and radially inner sides of the friction surface 2 respectively, the dust collection effect is better, which in turn makes the effect of improving the poor braking effect of the brake better.

[0037] See also Figure 2 and Figure 3 As shown, the first dust storage tank 3 has a first side wall 5 that surrounds the body 1. The first side wall 5 is away from the friction surface 2 and extends to the opening of the first dust storage tank 3. The body 1 has a central axis. From the bottom of the first dust storage tank 3 to the opening of the first dust storage tank 3, the first side wall 5 gradually tilts away from the central axis.

[0038] In this embodiment, because the first sidewall 5 gradually slopes away from the central axis of the body 1, the opening of the first dust storage tank 3 is relatively large. This makes it easier for dust generated when the friction plate 12 rubs against the body 1 to enter the first dust storage tank 3. Meanwhile, motors have a wide range of applications. Some motors are used in products with fixed installation positions, while others are used in moving products, such as robotic arms. The frequent flipping and movement of the robotic arm can cause the motor to tilt. The tilt of the first sidewall 5 makes it easier for the dust in the first dust storage tank 3 to be poured out when the motor tilts, thus helping to empty the first dust storage tank 3 for subsequent dust collection. The dust in the first dust storage tank 3 being poured into the motor does not have a significant impact on the motor.

[0039] See also Figure 1 and Figure 5 As shown, a first recessed area 6 is also constructed on the first end face of the body 1, which surrounds itself. Along the radial direction of the body 1, the first recessed area 6 is located outside the first dust storage tank 3.

[0040] In this technical solution, when the motor brakes, the motor speed drops sharply. During this process, the dust generated by the friction plate 12 rubbing against the body 1 is thrown up quite high. By setting the first recessed area 6, the dust that flies out of the first dust storage tank 3 can be stored, thereby further reducing the probability of dust entering the contact surface between the friction plate 12 and the body 1. At the same time, the setting of the first recessed area 6 can also increase the contact area between the body 1 and the air, further enhancing the heat exchange effect of the body 1.

[0041] Specifically, the first recessed area 6 is adjacent to the first dust storage tank 3; and / or, the first recessed area 6 extends to the edge of the body 1.

[0042] In this embodiment, the first recessed area 6 is adjacent to the first dust storage tank 3, that is, the first recessed area 6 is in contact with the first side wall 5 of the first dust storage tank 3. This eliminates the buffer zone between the first dust storage tank 3 and the first recessed area 6, allowing outwardly flying dust to be promptly stored in the first recessed area 6 when it cannot enter the first dust storage tank 3. When the first recessed area 6 extends to the edge of the body 1, it becomes a recessed area from the edge of the first dust storage tank 3 to the edge of the body 1, maximizing the first recessed area 6. This improves the effectiveness of collecting and storing dust that flies out of the first dust storage tank 3.

[0043] See also Figure 3As shown, a first step structure 7 is provided within the first recessed area 6, located on the side of the first recessed area 6 away from the edge of the body 1. During operation, the motor may tilt. When the first step structure 7 is provided within the first recessed area 6, if the motor tilts, the first step structure 7 will create a staggered buffer for dust sliding out from the first recessed area 6. This buffer can prevent dust from the first recessed area 6 from being transmitted between the friction plate 12 and the contact surface of the body 1. The first step structure 7 includes at least one first step, which extends circumferentially along the first recessed area 6.

[0044] See also Figure 1 and Figure 5 As shown, the bottom wall of the second dust storage tank 4 is provided with a plurality of through holes 8, which are distributed at intervals along the circumference of the second dust storage tank 4, and each through hole 8 penetrates the body 1.

[0045] In this technical solution, by constructing through holes 8 on the bottom wall of the second dust storage tank 4, the dust entering the second dust storage tank 4 can flow to the space outside the body 1 and friction plate 12, thereby preventing excessive dust accumulation in the second dust storage tank 4. The through holes 8 can be circular holes with a constant diameter or holes with a gradually decreasing diameter. When the through holes 8 are holes with a gradually decreasing diameter, compared to circular holes with a constant diameter, they have less impact on the structural strength of the body 1. Therefore, more holes with gradually decreasing diameters can be constructed, allowing dust to be quickly discharged from the second dust storage tank 4 from multiple directions.

[0046] See also Figure 2 and Figure 4 As shown, a second recessed region 9 is also constructed on the first end face of the body 1, which surrounds itself. Along the radial direction of the body 1, the second recessed region 9 is located inside the second dust storage tank 4.

[0047] In this embodiment, by providing a second recessed area 9, dust generated radially inward during the friction process between the friction plate 12 and the body 1 can be stored in the second recessed area 9 instead of entering the second dust storage tank 4, thereby further improving the dust collection effect. Simultaneously, the second recessed area 9 also increases the contact area between the body 1 and the air, further enhancing the heat exchange effect of the body 1.

[0048] In one specific implementation, the second recessed region 9 has a second sidewall 10 surrounding the body 1. The body 1 has a central axis, and from the bottom of the second dust storage tank 4 to its opening, the second sidewall 10 gradually slopes away from the central axis. The second dust storage tank 4 has a third sidewall and a fourth sidewall surrounding the body 1. The third sidewall is in contact with the second sidewall 10, and the fourth sidewall is in contact with the friction surface 2. Along the axial direction of the body 1, the height of the fourth sidewall is greater than the height of the third sidewall. The function of the second sidewall 10 is to facilitate the entry of dust from the second recessed region 9 into the second dust storage tank 4, thereby allowing the dust to flow through the through hole 8 to the space outside the body 1 and the friction plate 12. Along the axial direction of the body 1, when the height of the fourth sidewall is greater than the height of the third sidewall, the dust that slides out through the second sidewall 10 will smoothly enter the second dust storage tank 4.

[0049] See also Figure 2 and Figure 4 As shown, a shaft hole is constructed on the body 1. Along the radial direction of the body 1, the shaft hole is located inside the second recessed region 9, and the second recessed region 9 extends to communicate with the shaft hole.

[0050] In this embodiment, when the second recessed area 9 extends to communicate with the shaft hole of the body 1, the area between the second dust storage tank 4 and the shaft hole of the body 1 is a recessed area, so that the second recessed area 9 can be maximized, which is more effective in collecting and storing dust that flies out of the second dust storage tank 4.

[0051] See also Figure 4 As shown, a second step structure 11 is provided in the second recessed area 9, and the second step structure 11 is located on the inner side of the second side wall 10 along the radial direction of the body 1. The second step structure 11 is used to stratify the dust, so that the dust stays on the step structure, thereby preventing excessive dust from flowing into the second dust storage tank 4 and overflowing between the contact surface of the body 1 and the friction plate 12.

[0052] It should be noted that the friction surface 2 is the most protruding part of the body 1. The surface area of ​​the armature of a conventional electromagnetic brake is about 4788 square millimeters, while the armature of the present invention has a surface area of ​​about 5920 square millimeters due to the construction of the first dust storage groove 3, the second dust storage groove 4, the first recessed area 6, the first step structure 7, the through hole 8, the second recessed area 9, and the second step structure 11. This results in a 24% improvement in heat exchange efficiency of the armature of the present invention compared to the conventional armature.

[0053] The present invention also provides an electromagnetic brake, including the armature described above. The electromagnetic brake further includes an iron core 14, a coil 15, a coil frame 16, a spring 17, a resilient cylindrical pin 18, a flat key 19, a friction plate 12, and a hub 13. Figure 6As shown, coil 15 is nested in coil frame 16 to prevent deformation. Coil frame 16 is installed in iron core with an interference fit. Six springs 17 are evenly distributed in holes around iron core, supporting armature. Elastic cylindrical pin 18 is simultaneously located in the hole of iron core 14 and at the notch on the edge of armature. Friction plate 12 is located between body 1 and hub 13, and is connected to hub 13. When coil 15 is energized, iron core 14 generates magnetic force to attract armature, springs 17 are compressed, and a gap is created between armature and friction plate 12, and electromagnetic brake is in non-braking state. When coil 15 is de-energized, magnetic force disappears, and under the elastic force of spring 17, armature and friction plate 12 abut against each other for friction braking, and electromagnetic brake is in braking state. The first end face of the armature refers to the end face of the armature facing the friction plate 12. The friction surface 2 of the armature is slightly larger than the friction plate 12. The elastic cylindrical pin 18 is used to restrict the armature from rotating in the circumferential direction and guide the armature to move in the axial direction. The motor shaft drives the hub 13 to rotate synchronously through the flat key 19.

[0054] Specifically, when the electromagnetic brake is in the non-braking state, there is a distance L between the friction plate 12 and the friction surface 2, which is 0.05mm ≤ L ≤ 0.15mm. The distance between the friction plate 12 and the friction surface 2 of the body 1 cannot be too large or too small. If it is too small, the armature will not be fully attracted, causing the brake to overheat and the friction plate 12 to wear more quickly; if it is too large, it will increase the braking distance. The attraction and release times of this brake are 75ms and 30ms, respectively. Based on the spring force and the coordination of the brake components, preferably, 0.05mm ≤ L ≤ 0.15mm.

[0055] It should also be noted that the armature of this invention is lighter than that of traditional armatures, according to Hooke's Law f=kx, Newton's second law f=ma, and the laws of kinematics v=v0+at, v 2 -v0 2 =2ax can be derived That is, the response speed of the armature (actually, the time required for the armature to move to the corresponding position when the electromagnetic brake is in a braking or non-braking state) is proportional to the square root of its mass. Substituting the mass of the armature, the response speed is increased by 13%. Here, k is the stiffness coefficient, and the initial velocity v0 is zero.

[0056] The present invention also provides an electric motor, including the electromagnetic brake described above.

[0057] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0058] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above are merely preferred embodiments of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. An armature, characterized in that, Includes a body (1), the body (1) having a first end face, a friction surface (2) forming around the body (1) is formed on the first end face, a first dust storage groove (3) and a second dust storage groove (4) are constructed around the body (1) on the first end face, the first dust storage groove (3) is located outside the friction surface (2) along the radial direction of the body (1), the second dust storage groove (4) is located inside the friction surface (2), and both the first dust storage groove (3) and the second dust storage groove (4) are adjacent to the friction surface (2). The first end face is also provided with a first recessed area (6) that surrounds itself. Along the radial direction of the body (1), the first recessed area (6) is located outside the first dust storage tank (3). A first step structure (7) is provided in the first recessed area (6). The first step structure (7) is located on the side of the first recessed area (6) away from the edge of the body (1). The bottom wall of the second dust storage tank (4) is provided with a plurality of through holes (8), each of the through holes (8) is distributed at intervals along the circumference of the second dust storage tank (4), and each of the through holes (8) penetrates the body (1).

2. The armature according to claim 1, characterized in that, The first dust storage tank (3) has a first side wall (5) surrounding the body (1) around the perimeter. The first side wall (5) is away from the friction surface (2) and extends to the opening of the first dust storage tank (3). The body (1) has a central axis. From the bottom of the first dust storage tank (3) to the opening of the first dust storage tank (3), the first side wall (5) gradually tilts away from the central axis.

3. The armature according to claim 1, characterized in that, The first recessed area (6) is adjacent to the first dust storage tank (3); and / or, the first recessed area (6) extends to the edge of the body (1).

4. The armature according to any one of claims 1 to 3, characterized in that, The first end face is also provided with a second recessed area (9) that surrounds itself. Along the radial direction of the body (1), the second recessed area (9) is located inside the second dust storage tank (4).

5. The armature according to claim 4, characterized in that, The second recessed area (9) has a second side wall (10) surrounding the body (1), the body (1) has a central axis, and from the bottom of the second dust storage tank (4) to the opening of the second dust storage tank (4), the second side wall (10) gradually slopes away from the central axis; the second dust storage tank (4) has a third side wall and a fourth side wall surrounding the body (1), the third side wall is in contact with the second side wall (10), the fourth side wall is in contact with the friction surface (2), and along the axial direction of the body (1), the height of the fourth side wall is greater than the height of the third side wall.

6. The armature according to claim 5, characterized in that, The body (1) is provided with a shaft hole, which is located inside the second recessed area (9) along the radial direction of the body (1), and the second recessed area (9) extends to communicate with the shaft hole; and / or, a second step structure (11) is provided in the second recessed area (9), which is located inside the second side wall (10) along the radial direction of the body (1).

7. An electromagnetic brake, characterized in that, Includes the armature as described in any one of claims 1 to 6.

8. The electromagnetic brake according to claim 7, characterized in that, It also includes a friction plate (12) and a hub (13), the friction plate (12) being located between the body (1) and the hub (13), and the friction plate (12) being connected to the hub (13). The electromagnetic brake has a non-braking state. When the electromagnetic brake is in the non-braking state, there is a distance L between the friction plate (12) and the friction surface (2), where 0.05mm≤L≤0.15mm.

9. An electric motor, characterized in that, Includes the electromagnetic brake as described in claim 7 or 8.

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