Power-off brake and motor

Abstract

The power-off brake is applied to the motor and comprises a shell, a coil, a first elastic piece, a second elastic piece, a first connecting rod assembly, a second connecting rod assembly, a first friction assembly and a second friction assembly. According to the power-off brake, the friction area is increased, so that abrasion is reduced, and the braking effect is improved; and the requirement on the number of turns of the coil is reduced, and the manufacturing complexity is reduced, so that the problem of temperature rise of the brake stator caused by overheating of the coil is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to a power-off brake and an electric machine. BACKGROUND

[0002] Brake motors are widely used in modern industry, especially in situations where precise control of motor stopping and starting is required. The current market brake generally includes a coil, a spring, a friction plate and a brake disc, and its working principle is as follows: when the motor is unlocked, the brake is powered on, the coil is powered on to generate a magnetic field, attract the armature, compress the spring, and unlock the brake disc; when the motor is braked, the coil is powered off, the spring pushes the armature, squeezes the friction plate, and the brake disc and the friction plate are braked.

[0003] However, the existing brake motor technology has many problems in actual application. First, when the force on both ends of each spring in the spring group is uneven or the pressure is inconsistent, the armature will be unbalanced, which will reduce the effective contact area of the friction plate or cause severe wear in some contact parts, thereby affecting the braking effect. Secondly, in order to generate enough electromagnetic force in a limited space, the number of turns of the coil needs to be increased, which results in thinner wire diameter and more turns, not only increasing the manufacturing complexity, but also causing the stator temperature of the brake to rise, thereby affecting the service life and braking effect of the brake. CONTENT OF THE INVENTION

[0004] The present application mainly provides a power-off brake and an electric machine, which solves the problems of reduced effective contact area of the friction plate or severe wear in some contact parts and high temperature of the stator of the brake.

[0005] The present application provides a power-off brake applied to an electric machine, comprising:

[0006] A housing is provided with a through hole, and a rotating shaft of the electric machine is arranged in the through hole;

[0007] A coil is arranged on the housing;

[0008] A first elastic member and a second elastic member are arranged on opposite sides of the coil, and one end of the first elastic member and one end of the second elastic member are fixed on the housing;

[0009] A first link assembly and a second link assembly are connected to the other end of the first elastic member and the other end of the second elastic member, respectively;

[0010] A first friction assembly and a second friction assembly, one end of the first friction assembly is connected with the other end of the first connecting rod assembly, the other end of the first friction assembly is correspondingly arranged with the rotating shaft; one end of the second friction assembly is connected with the other end of the second connecting rod assembly, the other end of the second friction assembly is correspondingly arranged with the rotating shaft;

[0011] Wherein, the coil is provided with a magnetic guide, one end of the first connecting rod assembly is provided with a first magnetic member, the first magnetic member is connected with the other end of the first elastic member, and is correspondingly arranged with one end of the magnetic guide; one end of the second connecting rod assembly is provided with a second magnetic member, the second magnetic member is connected with the other end of the second elastic member, and is correspondingly arranged with the other end of the magnetic guide, the first friction assembly, the second friction assembly and the rotating shaft are frictionally braked.

[0012] Wherein, the coil is de-energized, the first elastic member and the second elastic member respectively pull the first magnetic member and the second magnetic member away from the magnetic guide, the first connecting rod assembly and the second connecting rod assembly respectively push the first friction assembly and the second friction assembly to be close to the rotating shaft, so that the first friction assembly, the second friction assembly and the rotating shaft are frictionally braked.

[0013] Wherein, the coil is energized, the first magnetic member and the second magnetic member are close to the magnetic guide, the first connecting rod assembly and the second connecting rod assembly respectively pull the first friction assembly and the second friction assembly away from the rotating shaft, to unlock the brake.

[0014] Wherein, the shell is provided with a first support and a second support, the first connecting rod assembly is slidably connected with the first support, the second connecting rod assembly is slidably connected with the second support, the first support and the second support are symmetrically arranged in the axial direction of the rotating shaft; the first friction assembly and the second friction assembly are symmetrically arranged in the axial direction of the rotating shaft.

[0015] Wherein, the first connecting rod assembly includes a first connecting rod and a second connecting rod, the first magnetic member is arranged on one end of the first connecting rod, the other end of the first connecting rod is connected with one end of the second connecting rod, the other end of the second connecting rod is connected with one end of the first friction assembly, and the first connecting rod is slidably connected with the first support;

[0016] The second connecting rod assembly includes a third connecting rod and a fourth connecting rod, the second magnetic member is arranged on one end of the third connecting rod, the other end of the third connecting rod is connected with one end of the fourth connecting rod, the other end of the fourth connecting rod is connected with one end of the second friction assembly, and the third connecting rod is slidably connected with the second support.

[0017] Wherein, the coil is powered off, the first elastic member and the second elastic member pull the first magnetic member and the second magnetic member away from the magnetic conductor respectively; the first connecting rod rotates clockwise around the first support, the first connecting rod pushes the second connecting rod and the first friction assembly; the third connecting rod rotates counterclockwise around the second support, the third connecting rod pushes the fourth connecting rod and the second friction assembly; the first friction assembly and the second friction assembly rub with the rotating shaft to brake.

[0018] Wherein, the coil is powered on, the first magnetic member and the second magnetic member approach the magnetic conductor; the first connecting rod rotates counterclockwise around the first support, the first connecting rod pulls the second connecting rod and the first friction assembly; the third connecting rod rotates clockwise around the second support, the third connecting rod pulls the fourth connecting rod and the second friction assembly; the first friction assembly and the second friction assembly are separated from the rotating shaft to unlock the brake.

[0019] Wherein, the first friction assembly comprises a first friction head and a first friction sheet, one end of the first friction head is connected with the other end of the second connecting rod, the other end of the first friction head is connected with one end of the first friction sheet, and the other end of the first friction sheet is correspondingly arranged on the rotating shaft.

[0020] The second friction assembly comprises a second friction head and a second friction sheet, one end of the second friction head is connected with the other end of the fourth connecting rod, the other end of the second friction head is connected with one end of the second friction sheet, and the other end of the second friction sheet is correspondingly arranged on the rotating shaft.

[0021] Wherein, the shell is further provided with at least one mounting hole, and the mounting hole is used to fix the power-off brake on the motor.

[0022] The application also provides an electric motor comprising a rotor, a stator and a power-off brake as described above.

[0023] The application has the following beneficial effects: compared with the traditional single spring pushing brake mode, the application can more evenly apply pressure to the friction assembly through the setting of the double elastic members, the double connecting rod assemblies and the double friction assemblies, and the setting of the double friction assemblies increases the friction area, thereby reducing wear and improving the braking effect; by setting the first magnetic member and the second magnetic member on the first connecting rod assembly and the second connecting rod assembly respectively and correspondingly arranging the magnetic conductors in the coil, the magnetic field can be more efficiently utilized in a limited space, the requirement for the number of turns of the coil is reduced, the manufacturing complexity is reduced, and the problem of temperature rise of the stator of the brake caused by overheating of the coil is solved. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative effort based on these drawings. Among them:

[0025] Figure 1 is a structural schematic diagram of an embodiment of the power-off brake in the braking state provided by the present application;

[0026] Figure 2 is a structural schematic diagram of an embodiment of the power-off brake in the unlocking state provided by the present application;

[0027] Figure 3 is a structural schematic diagram of an embodiment of the housing of the power-off brake provided by the present application. DETAILED DESCRIPTION

[0028] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0030] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0031] In this document, the term "embodiment" means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily mean that it refers to the same embodiment, nor is it independent or alternative to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0032] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A existing alone, A and B existing together, and B existing alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are in an "or" relationship.

[0033] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0034] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0035] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanical connection, or it can be electrical connection; it can be connected between, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0036] The existing brake motor technology has many problems in practical application. First, when the forces at both ends of each spring of the spring group are uneven or the pressures are inconsistent, the armature will be unbalanced, which will reduce the effective contact area of the friction plate or cause severe wear in some contact parts, thereby affecting the braking effect. Second, in order to generate sufficient electromagnetic force in a limited space, the number of turns of the coil needs to be increased, which results in a decrease in wire diameter and an increase in the number of turns, which not only increases the complexity of manufacturing, but also increases the temperature of the brake stator, thereby affecting the service life and braking effect of the brake.

[0037] The present application provides a power-off brake, please see Figures 1-3 As shown in the structure schematic diagram of an embodiment of the power-off brake in the braking state provided by the present application, Figure 1 is an embodiment of the power-off brake in the braking state provided by the present application; Figure 2is a structural schematic diagram of an embodiment of the power-off brake in an unlocked state provided by the present application; Figure 3 is a structural schematic diagram of an embodiment of the housing of the power-off brake provided by the present application. The power-off brake 1 of the embodiment is applied to a motor (not shown in the figure) and comprises a housing 10, a coil 20, a first elastic member 30, a second elastic member 40, a first connecting rod assembly 50, a second connecting rod assembly 60, a first friction assembly 70, and a second friction assembly 80.

[0038] The housing 10 is provided with a through hole 11, and a rotating shaft 100 of the motor is arranged in the through hole 11, that is, the rotating shaft 100 is arranged through the through hole 11.

[0039] The coil 20 is arranged on the housing 10. The arrangement mode of the coil 20 includes but is not limited to embedded arrangement. In some embodiments, the housing 10 is provided with a recess, and the coil 20 is arranged in the recess, as shown in Figures 1-3 .

[0040] The first elastic member 30 and the second elastic member 40 are respectively arranged on opposite sides of the coil 20, and one end of the first elastic member 30 and one end of the second elastic member 40 are fixed on the housing 10.

[0041] The first elastic member 30 and the second elastic member 40 include but are not limited to springs. In some embodiments, the housing 10 is provided with a recess, and the first elastic member 30 and the second elastic member 40 are arranged in the recess and are respectively located on opposite sides of the coil 20; two fixing columns (not labeled in the figure) are further arranged in the recess, and one end of the first elastic member 30 and one end of the second elastic member 40 are respectively fixed on the fixing columns, as shown in Figures 1-3 .

[0042] One end of the first connecting rod assembly 50 is connected with the other end of the first elastic member 30, and one end of the second connecting rod assembly 60 is connected with the other end of the second elastic member 40.

[0043] One end of the first friction assembly 70 is connected with the other end of the first connecting rod assembly 50, and the other end of the first friction assembly 70 is correspondingly arranged with the rotating shaft 100. One end of the second friction assembly 80 is connected with the other end of the second connecting rod assembly 60, and the other end of the second friction assembly 80 is correspondingly arranged with the rotating shaft 100.

[0044] The coil 20 is provided with a magnetic guide member 21, one end of the first connecting rod assembly 50 is provided with a first magnetic member 51, the first magnetic member 51 is connected with the other end of the first elastic member 30 and is correspondingly arranged with one end of the magnetic guide member 21. One end of the second connecting rod assembly 60 is provided with a second magnetic member 61, the second magnetic member 61 is connected with the other end of the second elastic member 40 and is correspondingly arranged with the other end of the magnetic guide member 21, and the first friction assembly 70, the second friction assembly 80 and the rotating shaft 100 are frictionally braked.

[0045] Wherein, the magnetic conductive piece 21 is used to enhance the magnetic field strength and magnetic flux generated by the coil 20, including but not limited to magnetic conductive strip; the first magnetic piece 51 and the second magnetic piece 61 include but are not limited to magnetic head.

[0046] The coil 20 generates two end magnetic poles when energized, according to the principle of magnetic attraction of ferromagnetic, can quickly generate force to make the power-off brake 1 release the brake faster.

[0047] In some embodiments, when the coil 20 is energized, a magnetic field is generated, and the magnetic field enhanced by the magnetic conductive piece 21 attracts the first magnetic piece 51 and the second magnetic piece 61; when the coil 20 is de-energized, the magnetic field disappears, and the first elastic piece 30 and the second elastic piece 40 pull the first magnetic piece 51 and the second magnetic piece 61 respectively, so that they are separated from the magnetic conductive piece 21; the first magnetic piece 51 and the second magnetic piece 61 drive the first connecting rod assembly 50 and the second connecting rod assembly 60 respectively, and then drive the first friction assembly 70 and the second friction assembly 80, so that the first friction assembly 70 and the second friction assembly 80 are in contact with the surface of the rotating shaft 100, generating friction force to realize friction braking.

[0048] Compared with the traditional single spring pushing brake mode, the present embodiment can more evenly apply pressure to the friction assembly through the setting of double elastic pieces, double connecting rod assemblies and double friction assemblies, and the setting of double friction assemblies increases the friction area, thereby reducing wear and improving the braking effect; by setting the first magnetic piece 51 and the second magnetic piece 61 on the first connecting rod assembly 50 and the second connecting rod assembly 60 respectively, and corresponding to the magnetic conductive piece 21 in the coil 20, the magnetic field can be more efficiently utilized in a limited space, reducing the requirement for the number of turns of the coil 20 and reducing the manufacturing complexity, thereby solving the problem of temperature rise of the brake stator caused by overheating of the coil 20.

[0049] According to some embodiments of the present application, referring to Figure 1 The coil 20 of the present embodiment is de-energized, the first elastic piece 30 and the second elastic piece 40 pull the first magnetic piece 51 and the second magnetic piece 61 away from the magnetic conductive piece 21 respectively, and the first connecting rod assembly 50 and the second connecting rod assembly 60 push the first friction assembly 70 and the second friction assembly 80 respectively to be close to the rotating shaft 100, so that the first friction assembly 70 and the second friction assembly 80 are in friction braking with the rotating shaft 100.

[0050] According to some embodiments of the present application, referring to Figure 2 The coil 20 of the present embodiment is energized, the first magnetic piece 51 and the second magnetic piece 61 are close to the magnetic conductive piece 21, and the first connecting rod assembly 50 and the second connecting rod assembly 60 pull the first friction assembly 70 and the second friction assembly 80 respectively away from the rotating shaft 100 to unlock the brake.

[0051] According to some embodiments of the present application, the housing 10 is provided with a first support column 12 and a second support column 13, the first connecting rod assembly 50 is in sliding connection with the first support column 12, the second connecting rod assembly 60 is in sliding connection with the second support column 13, and the first support column 12 and the second support column 13 are symmetrically arranged in the axial direction of the rotating shaft 100; the first friction assembly 70 and the second friction assembly 80 are symmetrically arranged in the axial direction of the rotating shaft 100.

[0052] In some embodiments, since the first connecting rod assembly 50 is in sliding connection with the first support column 12 and the second connecting rod assembly 60 is in sliding connection with the second support column 13, when the coil 20 is powered on or off, the first magnetic member 51 and the second magnetic member 61 drive the first connecting rod assembly 50 and the second connecting rod assembly 60; at this time, the first connecting rod assembly 50 and the second connecting rod assembly 60 rotate around the first support column 12 and the second support column 13, respectively.

[0053] For example, as shown in Figure 1 and Figure 2 , the first support column 12 and the second support column 13 are symmetrically arranged in the axial direction of the rotating shaft 100, and the first friction assembly 70 and the second friction assembly 80 are symmetrically arranged in the axial direction of the rotating shaft 100, and the power-off brake 1 is designed as a shaft-holding type.

[0054] In this embodiment, by symmetrically arranging the first support column 12 and the second support column 13 on the housing 10, and symmetrically arranging the first friction assembly 70 and the second friction assembly 80, the power-off brake 1 achieves high symmetry and stability in structure; this design not only improves the uniformity and reliability of braking, but also optimizes the use of space, reduces manufacturing and maintenance costs, and prolongs the service life of the power-off brake 1.

[0055] According to some embodiments of the present application, referring to Figure 1 and Figure 2 , the first connecting rod assembly 50 of this embodiment includes a first connecting rod 52 and a second connecting rod 53, the first magnetic member 51 is arranged on one end of the first connecting rod 52, the other end of the first connecting rod 52 is connected to one end of the second connecting rod 53, the other end of the second connecting rod 53 is connected to one end of the first friction assembly 70, and the first connecting rod 52 is in sliding connection with the first support column 12.

[0056] The second connecting rod assembly 60 includes a third connecting rod 62 and a fourth connecting rod 63, the second magnetic member 61 is arranged on one end of the third connecting rod 62, the other end of the third connecting rod 62 is connected to one end of the fourth connecting rod 63, the other end of the fourth connecting rod 63 is connected to one end of the second friction assembly 80, and the third connecting rod 62 is in sliding connection with the second support column 13.

[0057] In some embodiments, as shown in Figure 1 and Figure 2As shown, the first linkage assembly 50 and the second linkage assembly 60 are arranged in the groove of the housing 10; the first linkage 52 is in sliding connection with the first support 12, and the first support 12 is close to the other end of the first linkage 52; the third linkage 62 is in sliding connection with the second support 13, and the second support 13 is close to the other end of the third linkage 62; when the coil 20 is turned on or turned off, the first linkage 52 and the third linkage 62 rotate around the first support 12 and the second support 13 respectively; at this time, the first support 12 to the one end of the first linkage 52 is a power arm, and the first support 12 to the other end of the first linkage 52 is a resistance arm; the second support 13 to the one end of the third linkage 62 is a power arm, and the second support 13 to the other end of the third linkage 62 is a resistance arm; according to the principle of lever: power power arm = resistance resistance arm, since the power arm is greater than the resistance arm, the power is smaller than the resistance, that is, the first linkage 52 and the third linkage 62 are force-saving levers; the de-energized brake 1 can obtain greater braking or releasing torque with smaller pulling force and smaller electromagnetic attraction.

[0058] In this embodiment, the linkage brake is adopted, and the same speed motor can provide greater braking torque, so as to match a motor with greater power.

[0059] According to some embodiments of the present application, referring to Figure 1 As shown, the coil 20 of this embodiment is turned off, and the first elastic member 30 and the second elastic member 40 pull the first magnetic member 51 and the second magnetic member 61 away from the magnetic conductive member 21 respectively; the first linkage 52 rotates clockwise around the first support 12, and the first linkage 52 pushes the second linkage 53 and the first friction assembly 70; the third linkage 62 rotates counterclockwise around the second support 13, and the third linkage 62 pushes the fourth linkage 63 and the second friction assembly 80; the first friction assembly 70 and the second friction assembly 80 are in friction braking with the rotating shaft 100.

[0060] According to some embodiments of the present application, referring to Figure 2 As shown, the coil 20 of this embodiment is turned on, and the first magnetic member 51 and the second magnetic member 61 are close to the magnetic conductive member 21; the first linkage 52 rotates counterclockwise around the first support 12, and the first linkage 52 pulls the second linkage 53 and the first friction assembly 70; the third linkage 62 rotates clockwise around the second support 13, and the third linkage 62 pulls the fourth linkage 63 and the second friction assembly 80; the first friction assembly 70 and the second friction assembly 80 are separated from the rotating shaft 100 to unlock the brake.

[0061] According to some embodiments of the present application, referring to Figure 1 and Figure 2As shown, the first friction assembly 70 of the embodiment includes a first friction head 71 and a first friction sheet 72, one end of the first friction head 71 is connected with the other end of the second connecting rod 53, the other end of the first friction head 71 is connected with one end of the first friction sheet 72, and the other end of the first friction sheet 72 is correspondingly arranged with the rotating shaft 100.

[0062] The second friction assembly 80 includes a second friction head 81 and a second friction sheet 82, one end of the second friction head 81 is connected with the other end of the fourth connecting rod 63, the other end of the second friction head 81 is connected with one end of the second friction sheet 82, and the other end of the second friction sheet 82 is correspondingly arranged with the rotating shaft 100.

[0063] In the embodiment, the first friction assembly 70 includes the first friction head 71 and the first friction sheet 72, and the second friction assembly 80 includes the second friction head 81 and the second friction sheet 82. Through the split design, the power-off brake 1 can more accurately transmit force to the first friction sheet 72 and the second friction sheet 82 during braking, ensuring that the contact with the rotating shaft 100 is more closely, thereby improving the braking efficiency.

[0064] According to some embodiments of the present application, the housing 10 is further provided with at least one mounting hole 14, and the mounting hole 14 is used to fix the power-off brake 1 on the motor.

[0065] The mounting hole 14 includes but is not limited to a threaded hole or a through hole, which can cooperate with a screw or a pin to fix the housing 10 on the motor, so that the power-off brake 1 is installed on the motor. For example, as shown in the figure, the housing 10 is provided with four mounting holes. Figures 1-3

[0066] In addition, the stator and the armature of the existing brake are made of 10# steel with good magnetic conductivity, which is higher in cost than ordinary cast iron. The housing 10 of the embodiment can be made of ordinary alloy, and only the magnetic conducting piece 21, the first magnetic piece 51 and the second magnetic piece 61 are made of materials with good magnetic conductivity, which is lower in total cost.

[0067] Another embodiment of the present application further provides a motor including a rotor, a stator and the power-off brake 1 of the above-mentioned embodiment.

[0068] ​In summary, the application can apply pressure more evenly to the friction assembly compared to the traditional single spring push brake mode, and the double friction assembly increases the friction area, thereby reducing wear and improving brake effect. By setting the first magnetic member 51 and the second magnetic member 61 on the first connecting rod assembly 50 and the second connecting rod assembly 60 respectively, and corresponding with the magnetic guide member 21 in the coil 20, the magnetic field can be more efficiently utilized in limited space, reducing the number of turns of the coil 20 and the complexity of manufacturing, thereby solving the problem of brake stator temperature rise caused by overheating of the coil 20.

[0069] The above is only an embodiment of the application, and does not limit the patent scope of the application. Any equivalent structure or equivalent flow transformation using the content of the application specification and drawings, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the application.

Claims

1. A de-energized brake characterized by, The application is applied to a motor, which comprises: a shell, a through hole is arranged on the shell, and a rotating shaft of the motor is arranged in the through hole; a coil is arranged on the shell; a first elastic member and a second elastic member are arranged on opposite sides of the coil, and one end of the first elastic member and one end of the second elastic member are fixed on the shell; a first connecting rod assembly and a second connecting rod assembly, one end of the first connecting rod assembly is connected with the other end of the first elastic member, and one end of the second connecting rod assembly is connected with the other end of the second elastic member; a first friction assembly and a second friction assembly, one end of the first friction assembly is connected with the other end of the first connecting rod assembly, and the other end of the first friction assembly is arranged corresponding to the rotating shaft; one end of the second friction assembly is connected with the other end of the second connecting rod assembly, and the other end of the second friction assembly is arranged corresponding to the rotating shaft; wherein a magnetic conducting member is arranged in the coil, one end of the first connecting rod assembly is provided with a first magnetic member, the first magnetic member is connected with the other end of the first elastic member, and is arranged corresponding to one end of the magnetic conducting member; one end of the second connecting rod assembly is provided with a second magnetic member, the second magnetic member is connected with the other end of the second elastic member, and is arranged corresponding to the other end of the magnetic conducting member, and the first friction assembly and the second friction assembly are frictionally braked with the rotating shaft.

2. The de-energized brake of claim 1, wherein, When the coil is powered off, the first elastic member and the second elastic member pull the first magnetic member and the second magnetic member away from the magnetic conducting member respectively, and the first connecting rod assembly and the second connecting rod assembly push the first friction assembly and the second friction assembly to be close to the rotating shaft respectively, so that the first friction assembly, the second friction assembly and the rotating shaft are frictionally braked.

3. The de-energized brake of claim 1, wherein, When the coil is powered on, the first magnetic member and the second magnetic member are close to the magnetic conducting member, and the first connecting rod assembly and the second connecting rod assembly pull the first friction assembly and the second friction assembly away from the rotating shaft respectively, so as to unlock the brake.

4. The de-energized brake of claim 1, wherein, The shell is provided with a first support and a second support, the first connecting rod assembly is in sliding connection with the first support, the second connecting rod assembly is in sliding connection with the second support, and the first support and the second support are symmetrically arranged in the axial direction of the rotating shaft; the first friction assembly and the second friction assembly are symmetrically arranged in the axial direction of the rotating shaft.

5. The de-energized brake of claim 4, wherein, The first connecting rod assembly comprises a first connecting rod and a second connecting rod, the first magnetic member is arranged on one end of the first connecting rod, the other end of the first connecting rod is connected with one end of the second connecting rod, the other end of the second connecting rod is connected with one end of the first friction assembly, and the first connecting rod is in sliding connection with the first support; the second connecting rod assembly comprises a third connecting rod and a fourth connecting rod, the second magnetic member is arranged on one end of the third connecting rod, the other end of the third connecting rod is connected with one end of the fourth connecting rod, the other end of the fourth connecting rod is connected with one end of the second friction assembly, and the third connecting rod is in sliding connection with the second support.

6. The de-energized brake of claim 5, wherein, The coil is powered off, the first elastic member and the second elastic member pull the first magnetic member and the second magnetic member away from the magnetic conductor respectively; the first connecting rod rotates clockwise around the first support, the first connecting rod pushes the second connecting rod and the first friction assembly; the third connecting rod rotates around the second support, the third connecting rod pushes the fourth connecting rod and the second friction assembly; the first friction assembly, the second friction assembly and the rotating shaft are frictionally braked.

7. The de-energized brake of claim 5, wherein, The coil is powered on, the first magnetic member and the second magnetic member approach the magnetic conductor; the first connecting rod rotates counterclockwise around the first support, the first connecting rod pulls the second connecting rod and the first friction assembly; the third connecting rod rotates around the second support, the third connecting rod pulls the fourth connecting rod and the second friction assembly; the first friction assembly and the second friction assembly are separated from the rotating shaft to unlock the brake.

8. The de-energized brake of claim 5, wherein, The first friction assembly comprises a first friction head and a first friction sheet, one end of the first friction head is connected with the other end of the second connecting rod, the other end of the first friction head is connected with one end of the first friction sheet, and the other end of the first friction sheet is correspondingly arranged on the rotating shaft. The second friction assembly comprises a second friction head and a second friction sheet, one end of the second friction head is connected with the other end of the fourth connecting rod, the other end of the second friction head is connected with one end of the second friction sheet, and the other end of the second friction sheet is correspondingly arranged on the rotating shaft.

9. The de-energized brake of claim 1, wherein, The shell is further provided with at least one mounting hole, and the mounting hole is used for fixing the power-off brake on the motor.

10. An electric machine characterized by The power-off brake comprises a rotor, a stator and the power-off brake according to any one of claims 1-9.

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