TW202336360A - Electromagnetic pull-in assembly and brake - Google Patents

Abstract

The application provides an electromagnetic pull-in assembly and a brake, the electromagnetic pull-in assembly comprises a magnetic yoke iron core, an armature and a coil, the magnetic yoke iron core is coaxially provided with an annular mounting groove, and an opening of the mounting groove faces a first shaft side of the magnetic yoke iron core; the armature is arranged on the first shaft side of the magnetic yoke iron core, an annular corresponding face is formed at an area of the armature corresponding to the opening of the mounting groove, the corresponding face and the mounting groove form an annular magnetic circuit space, and a width of the magnetic circuit space is gradually increased in a direction away from an axis of the magnetic yoke iron core; and the coil is arranged in the magnetic circuit space. According to the electromagnetic pull-in assembly and the brake of the application, the magnetic induction intensity is close to or uniform, and compared with a traditional magnetic circuit space with the rectangular section, the electromagnetic pull-in assembly and the brake can generate large air gap magnetic force under the same coil magnetomotive force, so that larger spring force can be overcome, and the braking torque of the brake can be increased.

Description

Electromagnetic attraction components and brakes

This case belongs to the field of mechanical braking technology, specifically involving an electromagnetic attraction component and a brake.

When designing a traditional electromagnetic brake, the inside of the yoke core is provided with an annular groove for installing the coil. The cross section of the annular groove on the axial section is rectangular, and the corresponding cross section of the coil is also rectangular. According to Ampere's loop theorem, a closed magnetic field will be formed around the energized conductor, and the direction of the magnetic field is perpendicular to the direction of the current. Similarly, when the excitation current is passed into the coil, a magnetic field will be generated in the yoke core and armature surrounding the coil. When the thickness of the armature and the yoke core in the radial direction is constant, the corresponding circumferential surface area of the inner ring of the armature and the inner ring of the yoke core is smaller, so the magnetic field lines are densely distributed, and more magnetic field lines pass through the unit area; If the circumferential area corresponding to the outer circumference of the armature and the outer circumference of the yoke core is larger, the distribution of magnetic field lines will be sparse, and fewer magnetic field lines will pass through per unit area. Therefore, the magnetic induction intensity of the radial magnetic circuit in the brake will be unevenly distributed. When the radial direction When the magnetic field of the magnetic circuit on the inner side (corresponding to the inner ring of the yoke core and the inner ring of the armature) is saturated, the magnetic field of the magnetic circuit on the radially outer side (corresponding to the outer ring of the yoke core and the outer ring of the armature) is not saturated. From the magnetic field From a perspective, not only is the material utilization rate not high, but it also limits the magnetic force in the air gap between the armature and the yoke core. Since the magnetic force is used to overcome the spring force of the brake, it ultimately limits the braking torque of the brake.

The embodiment of this case provides an electromagnetic attraction component and a brake, aiming to solve the technical problem of limited braking torque caused by local saturation of the magnetic field, thereby preventing local saturation of the magnetic field in the magnetic circuit within the brake, making the magnetic induction intensity evenly distributed, thereby improving the braking performance of the brake. moment.

In the first aspect, the embodiment of this case provides an electromagnetic attraction component, including:

The yoke core is coaxially provided with an annular mounting slot, and the opening of the mounting slot faces the first axial side of the yoke core; the armature is located on the first axial side of the yoke core, The armature has the freedom to move toward or away from the yoke core. The armature is formed with an annular corresponding surface corresponding to the opening area of the mounting slot. The corresponding surface and the mounting slot form an annular magnetic circuit space. The magnetic circuit The width of the space gradually increases in a direction away from the axis of the yoke core, and the width direction of the magnetic circuit space is parallel to the axis direction of the yoke core; and a coil is placed in the magnetic circuit space, and the coil can be energized A magnetic field is generated to cause the armature to move toward the yoke core.

In connection with the first aspect, in a possible implementation manner, the cross-sectional shape of the magnetic circuit space is a right-angled trapezoid, the bottom surface of the installation groove is a tapered surface, and the corresponding surface is a flat surface.

In some embodiments, the cross-sectional shape of the coil is a rectangle; or, the cross-sectional shape of the coil is a right-angled trapezoid to form a tapered surface on a side away from the armature, and the tapered surface of the coil can fit into the groove of the mounting slot. The conical surface of the base.

In conjunction with the first aspect, in one possible implementation, the cross-sectional shape of the magnetic circuit space is a right-angled trapezoid, the bottom surface of the installation groove is a flat surface, and the corresponding surface is a tapered surface; or, the cross-section of the magnetic circuit space is equal to The waist is trapezoidal, and the bottom surface of the installation groove and the corresponding surface are both tapered surfaces.

In some embodiments, the armature includes an inner ring plate, an intermediate ring plate and an outer ring plate arranged coaxially in sequence from the inside to the outside. The inner ring of the intermediate ring plate is flush with the inner ring of the installation groove, and the outer ring of the intermediate ring plate is flush with the inner ring of the mounting groove. The ring is flush with the outer ring of the installation groove, the inner ring plate, the middle ring plate and the side of the outer ring plate facing away from the coil are flush, and the side of the middle ring plate facing the coil forms the corresponding surface; The thickness of the intermediate ring plate gradually decreases in a direction away from the axis of the yoke core, so that the corresponding surface forms a tapered surface.

In some embodiments, the thickness of the inner ring plate is equal to the maximum thickness of the middle ring plate, and the thickness of the outer ring plate is equal to the minimum thickness of the middle ring plate.

In some embodiments, the yoke core includes a first annular portion located on the outer ring of the mounting groove and a second annular portion located on the inner ring of the mounting groove. The thickness of the first annular portion is greater than that of the second annular portion. The thickness of the first annular portion and the outer annular plate is equal to the distance between the second annular portion and the inner annular plate.

In some embodiments, a first air gap surface is formed between the first annular portion and the outer ring plate, and a second air gap surface is formed between the second annular portion and the inner ring plate. The first air gap surface The first air gap surface and the second air gap surface are both perpendicular to the axis of the yoke core, and the first air gap surface and the second air gap surface are not coplanar.

In some embodiments, the thickness of the inner ring plate is equal to the thickness of the outer ring plate, and the thickness of the inner ring plate is equal to the maximum thickness of the middle ring plate, so that the middle ring plate and the outer ring plate form a gap to avoid the coil. First groove.

In some embodiments, the yoke core includes a first annular portion located on the outer ring of the mounting groove and a second annular portion located on the inner ring of the mounting groove, and the thickness of the first annular portion is equal to that of the second annular portion. The thickness of the first annular portion and the outer annular plate is equal to the distance between the second annular portion and the inner annular plate.

In some embodiments, a first air gap surface is formed between the first annular portion and the outer ring plate, and a second air gap surface is formed between the second annular portion and the inner ring plate. The first air gap surface The first air gap surface and the second air gap surface are both perpendicular to the axis of the yoke core, and the first air gap surface and the second air gap surface are coplanar.

In some embodiments, the cross-sectional shape of the coil is a rectangle; or, the cross-sectional shape of the coil is a trapezoid adapted to the spatial cross-sectional shape of the magnetic circuit.

In connection with the first aspect, in a possible implementation manner, the cross-sectional shape of the magnetic circuit space is a common trapezoid, and the bottom surface of the installation groove and the corresponding surface are both tapered surfaces.

In some embodiments, the cross-sectional shape of the coil is a rectangle; or, the cross-sectional shape of the coil is a trapezoid adapted to the spatial cross-sectional shape of the magnetic circuit.

In a second aspect, this embodiment also provides a brake, including the above-mentioned electromagnetic attraction component.

In the solution shown in the embodiment of this case, compared with the conventional technology, the width of the magnetic circuit space formed by the armature and the yoke core in the electromagnetic attraction assembly of this case gradually increases along the axial direction away from the yoke core. In the magnetic circuit space Under the changing trend, the area of the inner ring circumferential surface of the armature and/or the yoke iron core is approximately equal to or slightly smaller than the area of the outer ring circumferential surface, thus making the density of magnetic field lines passing through the inner ring and outer ring per unit area close, making the magnetic induction The strength is close to or uniform. Compared with the traditional magnetic circuit space with a rectangular cross-section, the structure of the embodiment of this case can generate a larger air gap magnetic force under the same coil magnetomotive force, thereby overcoming the larger spring force and increasing the magnetic force. The braking torque of the brake.

In order to make the technical problems, technical solutions and beneficial effects to be solved in this case more clear, this case will be further described in detail below with reference to drawings and examples. It should be understood that the specific embodiments described here are only used to explain the present case and are not used to limit the present case.

Please refer to Figures 1 to 14 together for a description of the electromagnetic attraction components provided in this case.

Referring to Figures 2, 5 to 7, 9, 12 to 14, the electromagnetic attraction component includes a yoke core 10, an armature 30 and a coil 20. The yoke core 10 An annular mounting groove 11 is coaxially provided, and the opening of the mounting groove 11 faces the first axial side of the yoke core 10; the armature 30 is provided on the first axial side of the yoke core 10, and the armature 30 has a direction toward or away from the yoke iron. The degree of freedom of movement of the core 10. The armature 30 is formed with an annular corresponding surface 301 corresponding to the opening area of the mounting slot 11. The corresponding surface 301 and the mounting slot 11 form an annular magnetic circuit space. The width of the magnetic circuit space is along the direction away from the yoke core. The direction of the axis 10 gradually increases; the coil 20 is placed in the magnetic circuit space, and the coil 20 can generate a magnetic field when energized, so that the armature 30 moves toward the yoke core 10 . It can be understood that the corresponding surface 301 is the end surface of the armature 30 on the first axis side. The corresponding surface 301 and the mounting groove 11 together form a magnetic circuit space.

It should be noted that the width direction of the magnetic circuit space is parallel to the axial direction of the yoke core 10 . The yoke core 10 is an annular structure with a central hole. After being assembled into a brake, the axis of the braked shaft passes through the central hole, and the axial direction of the yoke core 10 coincides with the axis of the braked shaft. The yoke core 10 has a first axial side and a second axial side distributed along the axial direction. The first axial side and the second axial side can be understood as two opposite end surfaces of the yoke core 10 . The magnetic yoke core 10 can be further referred to as a magnetic yoke, a shell, a magnetic conductor, a magnetic conductive shell, a housing, etc. The yoke core 10 and the armature 30 themselves do not have magnetism. When the coil 20 is energized, the yoke core 10 and the armature 30 are magnetized, generating magnetism, and then attract each other; when the coil 20 is not energized, the yoke core 10 and the magnetism of the armature 30 disappears.

When the electromagnetic attraction component provided by this embodiment is actually used, the electromagnetic attraction component is installed on the brake. In addition to the yoke core 10, coil 20 and armature 30 included in the electromagnetic attraction component itself, it also needs to be installed on the brake. A spring, a friction disc 40 and other components are installed on the yoke core 10. The friction disc 40 on the brake cooperates with the shaft sleeve or the motor shaft and rotates with the motor shaft. The brake can use the power-off braking method or the power-on braking method. Taking the power-off braking method as an example, when the motor shaft rotates normally, the coil 20 is energized to generate a magnetic field on its periphery, between the yoke core 10 and the armature 30 Magnetic force will be generated in the air gap, which will attract the armature 30 to move close to the yoke core 10. The armature 30 will be close to the yoke core 10 and squeeze the spring. At this time, the armature 30 is separated from the friction plate 40, and the friction plate 40 rotates normally; when After the coil 20 is powered off, the magnetic field disappears, that is, the magnetic force in the air gap between the yoke core 10 and the armature 30 disappears, and the spring rebounds to push the armature 30 away from the yoke core 10. At this time, the armature 30 is pressed against the friction plate 40. , braking is achieved through frictional resistance.

It should be noted that, as shown in Figures 2 and 5, the inner ring circumferential surface 35 and the outer ring circumferential surface 36 of the armature 30 refer to the circumferential surfaces that are flush with the two groove sides of the mounting groove 11, respectively. The inner ring circumferential surface 14 and the outer ring circumferential surface 15 of the yoke core 10 refer to circumferential surfaces that are flush with the two groove side surfaces of the mounting groove 11 respectively.

Compared with the conventional technology, the width of the magnetic circuit space formed by the armature 30 and the yoke core 10 in the electromagnetic attraction assembly of this case gradually increases along the axial direction away from the yoke core 10. Under the changing trend of the magnetic circuit space, Then the area of the inner ring circumferential surface (35 and/or 14) of the armature 30 and/or the yoke core 10 is approximately equal to or slightly smaller than the area of the outer ring circumferential surface (36 and/or 15), thus making the inner ring and outer ring The density of magnetic force lines passing through the coil unit area is close, making the magnetic induction intensity close or uniform. Compared with the traditional magnetic circuit space with a rectangular cross-section, the structure of this embodiment can produce a larger air gap magnetic force under the same coil magnetomotive force. This can overcome the greater spring force and increase the braking torque of the brake.

It should be noted that the reference numbers in the embodiment of this case please refer to Figures 1 to 14 together. If the corresponding view is not shown, you can refer to other figures. For example, for the structural schematic diagram of the yoke core 10, refer to Figure 1 Figure 4 and Figure 11, refer to Figure 3 and Figure 10 for the structural schematic diagram of the armature 30, the inner ring circumferential surface 14 and the outer ring circumferential surface 15 of the yoke core 10, the inner ring circumferential surface 35 and the outer ring of the armature 30 Refer to Figures 2 and 5 for the circumferential surface 36.

There is no restriction on the structural method in which the width of the magnetic circuit space gradually increases in the direction away from the axis of the yoke core 10 , and an example is given below.

In some embodiments, a specific implementation manner of the above-mentioned magnetic circuit space may adopt the structure shown in Figure 6 and Figure 13. Referring to Figures 6 and 13, the cross-sectional shape of the magnetic circuit space is a right-angled trapezoid, the bottom surface 111 of the mounting groove 11 is a tapered surface, and the corresponding surface 301 is a flat surface. It can be understood that the cross-sectional shape of the magnetic circuit space refers to the cross-sectional shape formed by the axial cross-section, where the conical surface and the flat surface are distinguished with reference to the radial cross-section. When the thickness of the armature 30 is sufficient but the thickness of the yoke core 10 corresponding to the mounting slot 11 is insufficient, only the bottom surface 111 of the mounting slot 11 in the yoke core 10 can be set as a tapered surface, so that the magnetic circuit space can be reduced. Correspondingly, a wedge-shaped magnetic circuit is formed, and the wedge-shaped magnetic circuit is only located in the yoke core 10 , thereby avoiding the need to provide a corresponding shape on the armature 30 and reducing manufacturing costs.

From another perspective, the corresponding surface 301 is a right-angled waist, and the bottom surface 111 of the mounting groove 11 is an oblique waist. In this embodiment, the slope or inclination of the groove bottom surface 111 of the installation groove 11 is a constant value and remains the same value. That is, the entire groove bottom surface 111 forms a slope, thereby forming a uniformly changing magnetic circuit space, so that the magnetic induction intensity Closer or even, improving braking efficiency.

When the cross-sectional shape of the magnetic circuit space is a right-angled trapezoid, the bottom surface 111 of the mounting groove 11 is a tapered surface, and the corresponding surface 301 is a flat surface, in some embodiments, a specific implementation of the above-mentioned coil 20 can be as shown in Figure 6 and The structure is shown in Figure 13. Referring to Figures 6 and 13, the cross-sectional shape of the coil 20 is a rectangle; or, the cross-sectional shape of the coil 20 is a right-angled trapezoid, so as to form a conical surface on the side away from the armature 30. The conical surface of the coil 20 can fit the installation The tapered surface of the groove bottom 111 of the groove 11. When the cross-section of the magnetic circuit space is a right-angled trapezoid, the cross-section of the coil 20 is also a corresponding right-angled trapezoid. Furthermore, the thickness of the coil 20 gradually increases in the direction away from the axis of the yoke core 10, and the winding space also gradually increases. , the number of turns of the winding also gradually increases, and the resistance of the coil 20 increases, which reduces the power of the coil 20, thereby reducing the temperature rise of the brake.

It can be understood that the cross-sectional shape of the coil 20 refers to the cross-sectional shape formed by the axial cut plane. When the cross-sectional shape of the coil 20 is a right-angled trapezoid, the cross-sectional shape of the coil 20 is the same as the cross-sectional shape of the magnetic circuit space, but the size is slightly different, so that the coil 20 can be correspondingly matched into the magnetic circuit space.

Different from the above embodiments, in some other embodiments, a specific implementation manner of the above magnetic circuit space can be as shown in Figure 2, Figure 5, Figure 7, Figure 9, Figure 12 and Figure 14 structure. Referring to Figures 7 and 14, the cross-sectional shape of the magnetic circuit space is a right-angled trapezoid, the bottom surface 111 of the mounting groove 11 is a flat surface, and the corresponding surface 301 is a tapered surface; or, see Figures 2, 5, and 9 , Figure 12, the cross-sectional shape of the magnetic circuit space is an isosceles trapezoid, and the groove bottom surface 111 and the corresponding surface 301 of the mounting groove 11 are both tapered surfaces.

From another perspective, when the cross-sectional shape of the magnetic circuit space is a right-angled trapezoid, the bottom surface 111 of the mounting groove 11 is a right-angled waist, and the corresponding surface 301 is an oblique waist; when the cross-sectional shape of the magnetic circuit space is an isosceles trapezoid When , the groove bottom surface 111 and the corresponding surface 301 of the installation groove 11 are both oblique waist edges.

As shown in Figures 7 and 14, when the thickness of the yoke core 10 corresponding to the mounting groove 11 is sufficient and the thickness of the armature 30 is insufficient, only the corresponding surface 301 on the armature 30 can be set as a tapered surface. The tapered surface on the armature 30 and the mounting groove 11 in the yoke core 10 form a magnetic circuit space with a right-angled trapezoidal cross-section. Compared with the conventional structure, this structure only requires reprocessing of the armature 30, and the manufacturing cost is lower. ; As shown in Figures 2, 5, 9 and 12, when the thickness of the yoke core 10 corresponding to the mounting slot 11 and the thickness of the armature 30 are insufficient, the yoke core 10 The bottom surface 111 and the corresponding surface 301 of the inner mounting groove 11 are both tapered surfaces. This structure allows the selection of armature 30 and yoke core 10 with smaller thickness, thereby reducing the thickness of the overall brake. Different embodiments are configured to meet different requirements. situation.

Of course, different from the above embodiment, in other embodiments, the cross-sectional shape of the magnetic circuit space can be an ordinary trapezoid, and the bottom surface 111 and the corresponding surface 301 of the mounting groove 11 are both tapered surfaces, but the tapers of the two are different. Correspondingly, the cross-sectional shape of the coil 20 may be a rectangle or a trapezoid adapted to the cross-sectional shape of the magnetic circuit space.

In addition, unlike the above embodiment, in other embodiments, the cross-sectional shape of the magnetic circuit space can be such that the two groove side surfaces are parallel to the axis, the groove bottom surface 111 is a combined tapered surface with different tapers, and the corresponding surface 301 is a plane; or, The groove bottom surface 111 is a flat surface, and the corresponding surface 301 is a combined tapered surface with different tapers.

In the conventional technology, when designing the installation slot in the yoke iron core, there are cases where the installation slot is designed to be locally narrowed. However, this method only achieves local uniformity of magnetic induction intensity and cannot achieve uniformity and consistency. Better magnetic induction intensity, and in terms of processing difficulty, the local narrowing process is more difficult to control and difficult to achieve the target shape. At the same time, when using the local narrowing process, if the shape of the coil is rectangular, it is difficult to achieve To maximize the efficiency of the installation slot space, if the shape of the coil is designed accordingly, the local narrowing will be more difficult to design and process.

Since the known technology has always been designed in this way, a person with ordinary knowledge in the technical field to which this case belongs can only carry out precise design based on conventional design and conventional technical teachings, and will not think of structural improvements. . The inventor of this case broke the traditional inherent thinking and used creative work to design the bottom surface 111 and/or the corresponding surface 301 of the installation groove 11 into an overall changing trend. Although it seems that only the shape of the magnetic circuit space has been adjusted, However, such a design idea requires re-designing the structures of the yoke core 10, the armature 30 and the coil 20, and has produced unexpected technical effects, such as the uniformity and consistency of the magnetic induction intensity in practical applications. The effect is better, the processing technology is simpler, and the target shape is easy to obtain, and the coil 20 is designed with a regular shape, which can reduce the difficulty of design and processing, and exceeds the imagination of this design idea by those with ordinary knowledge in the technical field to which this case belongs.

The creative height of an invention does not just lie in how complex and difficult its solution is. On the contrary, simple designs such as mobile phone selfie sticks and can pull rings are extremely practical, unexpected effects, and huge. It has been widely spread and praised due to factors such as technical inspiration in the field and great social progress.

Corresponding to this case, on the one hand, the design concept of this case is not a simple design in an absolute sense. On the other hand, it is of great enlightenment for technological improvements in this field and can achieve excellent product effects. Therefore, the design concept of this case is Worthy of higher creative heights and judgment.

The specific structures of the yoke core 10 and the armature 30 will be described below with examples.

When the embodiment shown in Figures 6 and 13 is adopted, the cross-sectional shape of the magnetic circuit space is a right-angled trapezoid, the bottom surface 111 of the mounting groove 11 is an oblique waist, and the corresponding surface 301 is a right-angled waist. Correspondingly, since the corresponding surface 301 is a right-angled waist, the end surface of the armature 30 facing the yoke core 10 can be an entire plane. Of course, the end surface of the armature 30 facing away from the yoke core 10 can also be an entire plane. , in this case, the armature 30 has a ring-shaped structure with constant thickness.

When the embodiments shown in Figures 1 to 5 and 8 to 12 are adopted, the cross-sectional shape of the magnetic circuit space is an isosceles trapezoid, and the bottom surface 111 and the corresponding surface 301 of the mounting groove 11 are both inclined. waist. Correspondingly, since the corresponding surface 301 is an oblique waist, the end surface of the armature 30 facing the yoke core 10 needs to avoid the coil 20 in space, that is, the end surface of the armature 30 facing the yoke core 10 is a stepped surface. When the end surface of the armature 30 facing away from the yoke core 10 is an entire plane, in this case, the armature 30 has an annular structure with a non-constant thickness.

When the embodiment shown in Figures 7 and 14 is adopted, the cross-sectional shape of the magnetic circuit space is a right-angled trapezoid, the bottom surface 111 of the mounting groove 11 is a right-angled waist, and the corresponding surface 301 is an oblique waist. Correspondingly, since the corresponding surface 301 is an oblique waist, the end surface of the armature 30 facing the yoke core 10 needs to avoid the coil 20 in space, that is, the end surface of the armature 30 facing the yoke core 10 is a stepped surface. When the end surface of the armature 30 facing away from the yoke core 10 is an entire plane, in this case, the armature 30 has an annular structure with a non-constant thickness.

When the armature 30 is an annular structure with a non-constant thickness, in some embodiments, a specific implementation of the armature 30 may be as shown in Figures 1 to 5, 7, 8 to 12, The structure is shown in Figure 14. Referring to Figures 1 to 5, 7, 8 to 12 and 14, the armature 30 includes an inner ring plate 31, a middle ring plate 32 and an outer ring plate 33 arranged coaxially from the inside to the outside. The inner ring of the middle ring plate 32 is flush with the inner ring of the mounting groove 11, the outer ring of the middle ring plate 32 is flush with the outer ring of the mounting groove 11, and the inner ring plate 31, the middle ring plate 32 and the outer ring plate 33 are away from the line. One side of the coil 20 is flush; the middle ring plate 32 forms the above-mentioned corresponding surface 301 on one side facing the coil 20; the thickness of the middle ring plate 32 gradually decreases in the direction away from the axis of the yoke core 10, so that the corresponding surface 301 is formed conical surface. The middle ring plate 32 corresponds to the mounting groove 11 of the yoke core 10, so the area corresponding to the inner ring plate 31 and the yoke core 10 does not change, nor does the area corresponding to the outer ring plate 33 and the yoke core 10 change. The area can be processed on the conventional armature 30 to obtain the required intermediate ring plate 32. The processing is convenient, and the reuse of the conventional armature 30 also appropriately reduces the cost.

Combined with the specific structure of the above-mentioned armature 30, in some embodiments, a specific implementation mode of the above-mentioned armature 30 may adopt the structures shown in Figure 5, Figure 7 and Figure 12. Referring to Figures 5, 7 and 12, the thickness of the inner ring plate 31 is equal to the maximum thickness of the middle ring plate 32, and the minimum thickness of the outer ring plate 33 is equal to the middle ring plate 32. In this case, the thickness of the inner ring plate 31 is a first constant thickness, the thickness of the middle ring plate 32 is a gradual thickness, the thickness of the outer ring plate 33 is a second constant thickness, and the first constant thickness is greater than the second constant thickness. The gradient thickness is connected between the first constant thickness and the second constant thickness and gradually decreases. This changing trend causes the radius of the annular section of the armature 30 (that is, the circumferential surface gradually expanding from the inner ring to the outer ring) to gradually increase, but the thickness gradually decreases, and the outer ring plate 33 of the outermost ring gradually increases. The thickness is minimal, thereby reducing the area difference between the circumferential surface of the inner ring and the circumferential surface of the outer ring.

Combined with the thickness of the above-mentioned inner ring plate 31 , middle ring plate 32 and outer ring plate 33 , in some embodiments, an improved implementation of the above-mentioned yoke core 10 can be as shown in Figure 5, Figure 7 and Figure 12 The structure shown in the figure. Referring to Figures 5, 7 and 12, the yoke core 10 includes a first annular portion 12 located on the outer ring of the mounting groove 11 and a second annular portion 13 located on the inner ring of the mounting groove 11. The first annular portion The thickness of the first annular portion 12 is greater than the thickness of the second annular portion 13 , and the distance between the first annular portion 12 and the outer annular plate 33 is equal to the distance between the second annular portion 13 and the inner annular plate 31 . Since the thickness of the inner ring plate 31 is greater than the thickness of the outer ring plate 33 , the thickness of the first annular portion 12 of the yoke core 10 is also correspondingly increased to prevent magnetic leakage from between the armature 30 and the yoke core 10 from affecting the equipment. other components that are sensitive to magnetic fields.

It should be noted that there is an air gap between the yoke core 10 and the armature 30 , and the uniformity of the air gap affects the uniformity and stability of the magnetic induction intensity.

In this embodiment, a first air gap surface 71 is formed between the first annular part 12 and the outer ring plate 33, and the first air gap surface 71 is perpendicular to the axis of the yoke core 10; the second annular part 13 and the inner ring A second air gap surface 72 is formed between the plates 31 . The second air gap surface 72 is also perpendicular to the axis of the yoke core 10 , and the first air gap surface 71 and the second air gap surface 72 are not coplanar. When assembling the yoke core 10 and the armature 30, it is easier to achieve alignment between the first annular plate 12 and the outer annular plate 33, and between the second annular portion 13 and the inner annular plate 31, which can improve assembly efficiency and ensure The uniformity and consistency of the air gap surface can improve the uniformity and consistency of the magnetic induction intensity and reduce the possibility of magnetic leakage.

However, in the conventional technology, within the portion of the yoke core and the armature extending inward from the outer peripheral edge, the air gap surface formed between the two is arranged at an acute or obtuse angle with the axis of the yoke core. This air gap method, on the one hand, needs to strictly ensure the dimensional accuracy of the yoke core and armature in the process of preparing the two, making the processing difficult; on the other hand, in the process of assembling the yoke core and armature , since the air gap surface is inclined, alignment is extremely difficult. It is necessary to strictly ensure the uniformity and consistency of the air gap between the two, and assembly is difficult. When a detection device needs to be used to detect the air gap between the two, the detection It is difficult for the device to extend into the air gap, making it difficult to operate, and the air gap cannot be accurately measured.

Regarding the problems that arise in the conventional technology, in this embodiment, the first air gap surface 71 and the second air gap surface 72 are both perpendicular to the axis of the yoke core 10. On the one hand, the dimensional accuracy of the two can be strictly guaranteed. , reducing the difficulty of processing. On the other hand, the yoke core 10 and the armature 30 are easy to align and easy to assemble quickly, and it is easy to use a detection device to extend into the air gap for measurement, which can reduce the detection time and ensure the measurement accuracy of the air gap. , to ensure the uniformity and consistency of the air gap, thereby ensuring the uniformity and consistency of the magnetic induction intensity.

Different from the structures shown in Figures 5, 7 and 12 above, in some other embodiments, a modified implementation of the armature 30 can adopt the structures shown in Figures 2, 9 and 14 . Referring to Figures 2, 9 and 14, the thickness of the inner ring plate 31 is equal to the thickness of the outer ring plate 33, and the thickness of the inner ring plate 31 is equal to the maximum thickness of the middle ring plate 32. In this case, the thickness of the inner ring plate 31 is a first constant thickness, the thickness of the middle ring plate 32 is a gradual thickness, the thickness of the outer ring plate 33 is a second constant thickness, and the first constant thickness is equal to the second constant thickness. The gradient thickness extends from the first constant thickness toward the second constant thickness and gradually decreases. Since the minimum thickness of the gradient thickness is less than the second constant thickness, the middle ring plate 32 and the outer ring plate 33 can enclose the first groove. 34, that is, the first groove 34 is recessed on one side of the middle ring plate 32 facing the coil 20.

This changing trend causes the radius of the annular cross-section (ie, the circumferential surface that gradually expands from the inner ring to the outer ring) of the intermediate ring plate 32 to gradually increase in the radial direction, but the thickness gradually decreases, thereby reducing the inner ring circumferential surface. The area is different from the area of the outer ring circumferential surface, but the thickness of the inner ring plate 31 and the outer ring plate 33 are both constant, and there is no corresponding change trend. Compared with Figures 5, 7 and 12 The illustrated embodiment of the armature 30 reduces the thickness processing steps, and thus the processing cost is relatively low.

In this embodiment, the thickness of the first annular portion 12 is equal to the thickness of the second annular portion 13 . A first air gap surface 71 is formed between the first annular portion 12 and the outer ring plate 33 , and a second air gap surface 72 is formed between the second annular portion 13 and the inner ring plate 31 . The first air gap surface 71 and the second The air gap surfaces 72 are both perpendicular to the axis of the yoke core 10 , and the first air gap surface 71 and the second air gap surface 72 are coplanar. The beneficial effects of this embodiment over the conventional technology are the same as the beneficial effects of the first air gap surface 71 and the second air gap surface 72 in the above embodiment, and will not be described again here.

It should be noted that when the thickness of the first annular portion 12 is equal to the thickness of the second annular portion 13 , it can be equal in an absolute sense or in a relative sense, that is, the first annular portion 12 is allowed to be equal to the thickness of the second annular portion 13 . The thickness of the first annular part 12 and the second annular part 13 is slightly larger than the thickness of the second annular part 13. At this time, the thickness difference between the first annular part 12 and the second annular part 13 is very small, for example, between 0.02 mm and 0.05 mm. Therefore, this kind of The thickness difference is negligible. Correspondingly, the first air gap surface 71 and the second air gap surface 72 are coplanar in an absolute sense or coplanar in a relative sense.

In addition, as shown in Figure 5, the first air gap surface 71 and the second air gap surface 72 in the above embodiment are not coplanar. When preparing the yoke core 10 and the armature 30, it is necessary to more strictly ensure the dimensions of the two. Precision, relatively many processing steps, and relatively high processing cost; when assembling the yoke core 10 and the iron core 30, since the coil 20 is located at the corner of the air gap where the yoke core 10 and the armature 30 fit, the magnetic induction lines Easily disperses in the air without restraint.

In view of the problem of the embodiment shown in Figure 5, as a more preferred embodiment, as shown in Figure 2, the first air gap surface 71 and the second air gap surface 72 are coplanar, and the intermediate ring plate 32 forms a first concave surface. groove 34, which can reduce the processing steps of the armature 30, ensure dimensional consistency, and reduce processing costs. At the same time, due to the limiting effect of the first groove 34, the divergence of the magnetic induction lines can be reduced, reducing the possibility of magnetic flux leakage, and ensuring Effective utilization of magnetic induction lines.

In some embodiments, a specific implementation of the above-mentioned coil 20 may adopt the structure shown in Figure 2, Figure 5, Figure 7, Figure 9, Figure 12 and Figure 14. Referring to Figures 2, 5, 7, 9, 12 and 14, the cross-sectional shape of the coil 20 is a rectangle; or the cross-sectional shape of the coil 20 is a trapezoid adapted to the shape of the magnetic circuit space.

As mentioned above, when the bottom surface 111 of the mounting groove 11 is a tapered surface and the corresponding surface 301 is a flat surface, the side of the coil 20 facing away from the armature 30 is also a tapered surface. In this embodiment, when the bottom surface 111 of the mounting groove 11 is a flat surface and the corresponding surface 301 is a tapered surface, the side of the coil 20 facing the armature 30 is a tapered surface; when the bottom surface 111 and the corresponding surface 301 of the mounting groove 11 are both When it is a cone surface, the two axial end surfaces of the coil 20 are also corresponding cone surfaces. By adapting the cross-sectional shape of the coil 20 to the cross-sectional shape of the magnetic circuit space, the magnetic circuit space can be fully utilized, so that the number of windings of the coil 20 in the direction away from the axis of the yoke core 10 gradually increases, and the resistance of the coil 20 increases. , reducing the power of the coil 20, thereby reducing the temperature rise of the brake.

Based on the same inventive concept, an embodiment of the present case also provides a brake including the above-mentioned electromagnetic attraction component.

The more common specific implementation methods can be divided into two types:

(1) Refer to Figures 1 to 7. The type of brake is a traditional brake: the electromagnetic attraction component is installed on the brake, except for the yoke core 10, coil 20 and armature 30 included in the electromagnetic attraction component itself. , it is also necessary to install springs, friction discs 40, tail plates 60 and other components on the yoke core 10. The friction disc 40 on the brake cooperates with the bushing or motor shaft and rotates with the motor shaft. When the motor shaft rotates normally , the coil 20 is energized to generate a magnetic field around its periphery, and a magnetic force is generated in the air gap between the yoke core 10 and the armature 30, thereby attracting the armature 30 to move closer to the yoke core 10, and the armature 30 approaches the yoke core 10 and squeezes Press the spring. At this time, the armature 30 is separated from the friction plate 40, and the friction plate 40 rotates normally; when the coil 20 is powered off, the magnetic field disappears, that is, the magnetic force in the air gap between the yoke core 10 and the armature 30 disappears, and the spring rebounds to push The armature 30 is far away from the yoke core 10. At this time, the armature 30 is pressed against the friction plate 40, and an end surface of the friction plate 40 facing away from the armature 30 is pressed against the tail plate 60. Braking is achieved through frictional resistance.

(2) Refer to Figures 8 to 14. The brake is a new type of thin brake: the electromagnetic attraction component is installed on the brake. In addition to the yoke core 10, coil 20 and armature 30 included in the electromagnetic attraction component itself, It is also necessary to install springs, friction discs 40, movable plates 50 and other components on the yoke core 10. The friction disc 40 on the brake cooperates with the sleeve or the motor shaft and rotates with the motor shaft. When the motor shaft rotates normally, The coil 20 is energized to generate a magnetic field around its periphery, and a magnetic force is generated in the air gap between the yoke core 10 and the armature 30 , thereby attracting the armature 30 to move closer to the yoke core 10 , and the armature 30 approaches and squeezes the yoke core 10 Spring, at this time, the armature 30 is connected to the movable plate 50 so that the movable plate 50 is separated from the friction plate 40, and the friction plate 40 rotates normally; when the coil 20 is powered off, the magnetic field disappears, that is, there is an air gap between the yoke core 10 and the armature 30. The magnetic force disappears, and the spring rebounds to push the armature 30 away from the yoke core 10. At this time, the armature 30 drives the movable plate 50 to squeeze against the friction plate 40, and braking is achieved through frictional resistance.

Of course, in the above two embodiments, the friction disc 40 is a double-sided friction method. In other embodiments, the electromagnetic attraction assembly provided in this embodiment can be applied to a single-sided friction brake, that is, a friction disc. 40 can have only one end face for friction braking, and there is no restriction on this. The brake in this case is intended to include the above-mentioned electromagnetic attraction components. There are no restrictions on the form and structure of other components, and it has a very wide range of application scenarios.

Compared with the conventional technology, the width of the magnetic circuit space formed by the armature 30 and the yoke core 10 in the brake of this case gradually increases along the axial direction away from the yoke core 10. Under the changing trend of the magnetic circuit space, the armature 30 And/or the area of the inner ring circumferential surface of the yoke iron core 10 is approximately equal to or slightly smaller than the area of the outer ring circumferential surface, so that the density of magnetic field lines passing through the inner ring and the outer ring per unit area is close, so that the magnetic induction intensity is close or uniform, relatively Compared with the traditional magnetic circuit space with a rectangular cross-section, the structure of this embodiment can generate a larger air gap magnetic force under the same coil magnetomotive force, thereby overcoming a larger spring force and increasing the braking torque of the brake.

It should be noted that in the conventional technology, similar to the electromagnetic clutch, there may be cases where the coil is set in a gradual structure. However, in the electromagnetic clutch, the spatial structure of the yoke core, armature, coil, and friction disk is different from that of the present case. It is completely different. It is impossible to comprehensively design the stacked yoke core, armature and friction disk, and there is no need to design the spatial relationship between the yoke core, armature and coil. When the gradient coil 20 is used in this case, since the yoke core 10 and the armature 30 jointly surround the coil 20, the relationship between the three needs to be strictly designed, and the yoke core 10 needs to be designed reasonably. Shape and size, the shape and size of the armature 30 need to be designed accordingly, the uniformity of the air gap between the yoke core 10 and the armature 30 needs to be ensured, and the processing method needs to be considered for the yoke core 10 and the armature 30 In production, we need to consider how to reduce processing costs and simplify processing steps, etc. In other words, the gradient coil 20 cannot be directly applied to this case, and there are technical difficulties in conversion, which requires comprehensive consideration from the above aspects. , it takes a lot of creative work to design a comprehensive and strong electromagnetic attraction component with higher magnetic effect, higher practicality, lower cost, simpler process, etc.

It can be understood that the various parts in the above embodiments can be freely combined or deleted to form different combination embodiments. The specific content of each combination embodiment will not be described again. After this description, the description of this case can be considered Various combination embodiments have been described and different combination embodiments can be supported.

The above are only preferred embodiments of this case and are not intended to limit this case. Any modifications, equivalent substitutions and improvements made within the spirit and principles of this case shall be included in the scope of protection of this case.

10:Yoke core 11:Installation slot 111:Trough bottom 12: First ring part 13:Second ring part 14: Inner ring circumferential surface 15: Outer ring circumferential surface 20: coil 30:Armature 301:Corresponding surface 31:Inner ring plate 32: Middle ring plate 33:Outer ring plate 34: First groove 35: Inner ring circumferential surface 36: Outer ring circumferential surface 40: Friction disc 50:movable board 60: Tail plate 71: First air gap surface 72: Second air gap surface

Figure 1 is a schematic view of the main structure of the brake provided in Embodiment 1 of this case; Figure 2 is a cross-sectional structural view along line A-A in Figure 1; Figure 3 is a schematic diagram of the three-dimensional structure of the armature used in Embodiment 1 of this case; Figure 4 is a schematic three-dimensional structural diagram of the yoke core used in Embodiment 1 of this case; Figure 5 is a schematic cross-sectional structural view of the brake provided in Embodiment 2 of this case (same perspective as Figure 2); Figure 6 is a schematic cross-sectional structural view of the brake provided in Embodiment 3 of this case (same perspective as Figure 2); Figure 7 is a schematic cross-sectional structural view of the brake provided in Embodiment 4 of this case (same perspective as Figure 2); Figure 8 is a schematic view of the main structure of the brake provided in Embodiment 5 of this case; Figure 9 is a cross-sectional structural view along line B-B in Figure 8; Figure 10 is a schematic diagram of the three-dimensional structure of the armature used in Embodiment 5 of this case; Figure 11 is a schematic three-dimensional structural diagram of the yoke core used in Embodiment 5 of this case; Figure 12 is a schematic cross-sectional structural diagram of the brake provided in Embodiment 6 of this case (same viewing angle as Figure 9); Figure 13 is a schematic cross-sectional structural diagram of the brake provided in Embodiment 7 of this case (same viewing angle as Figure 9); Figure 14 is a schematic cross-sectional structural diagram of the brake provided in Embodiment 8 of this case (same viewing angle as Figure 9).

10:Yoke core

11:Installation slot

111:Trough bottom

14: Inner ring circumferential surface

15: Outer ring circumferential surface

20: coil

30:Armature

301:Corresponding surface

34: First groove

35: Inner ring circumferential surface

36: Outer ring circumferential surface

60: Tail plate

71: First air gap surface

72: Second air gap surface

Claims (15)

An electromagnetic attraction component, including: A yoke iron core, the yoke iron core is coaxially provided with an annular mounting slot, and the opening of the mounting slot faces the first axis side of the yoke iron core; An armature is provided on the first axis side of the yoke core. The armature has a degree of freedom to move toward or away from the yoke core. The armature is formed with an annular corresponding surface corresponding to the area of the opening of the mounting slot. The corresponding surface and the mounting groove form an annular magnetic circuit space. The width of the magnetic circuit space gradually increases in a direction away from the axis of the yoke core. The width direction of the magnetic circuit space is parallel to the axis of the yoke core. direction; and A coil is placed in the magnetic circuit space. The coil can generate a magnetic field when energized, so that the armature moves toward the yoke core. As for the electromagnetic attraction component of claim 1, the cross-sectional shape of the magnetic circuit space is a right-angled trapezoid, the bottom surface of the installation groove is a tapered surface, and the corresponding surface is a flat surface. As for the electromagnetic attraction component described in claim 2, the cross-sectional shape of the coil is rectangular; Or, the cross-sectional shape of the coil is a right-angled trapezoid, so as to form a tapered surface on a side away from the armature, and the tapered surface of the coil can fit into the tapered surface of the bottom surface of the mounting groove. As for the electromagnetic attraction component described in claim 1, the cross-sectional shape of the magnetic circuit space is a right-angled trapezoid, the bottom surface of the installation groove is a flat surface, and the corresponding surface is a tapered surface; Or, the cross-sectional shape of the magnetic circuit space is an isosceles trapezoid, and the bottom surface of the installation groove and the corresponding surface are both tapered surfaces. As for the electromagnetic attraction component of claim 4, the armature includes an inner ring plate, an intermediate ring plate and an outer ring plate that are coaxially arranged in sequence from the inside to the outside. The inner ring of the intermediate ring plate and the inner ring of the installation groove are The outer ring of the middle ring plate is flush with the outer ring of the installation groove. The inner ring plate, the middle ring plate and the side of the outer ring plate away from the coil are flush. The middle ring plate faces the One side of the coil forms the corresponding surface; The thickness of the intermediate ring plate gradually decreases in a direction away from the axis of the yoke core, so that the corresponding surface forms a tapered surface. As for the electromagnetic attraction component of claim 5, the thickness of the inner ring plate is equal to the maximum thickness of the middle ring plate, and the thickness of the outer ring plate is equal to the minimum thickness of the middle ring plate. As for the electromagnetic attraction component of claim 6, the yoke core includes a first annular portion located at the outer ring of the mounting groove and a second annular portion located at the inner ring of the mounting groove, and the first annular portion The thickness of the first annular part is greater than the thickness of the second annular part, and the distance between the first annular part and the outer ring plate is equal to the distance between the second annular part and the inner ring plate. As for the electromagnetic attraction component of claim 7, a first air gap surface is formed between the first annular portion and the outer ring plate, and a second air gap is formed between the second annular portion and the inner ring plate. The first air gap surface and the second air gap surface are both perpendicular to the axis of the yoke core, and the first air gap surface and the second air gap surface are not coplanar. As for the electromagnetic attraction component of claim 5, the thickness of the inner ring plate is equal to the thickness of the outer ring plate, and the thickness of the inner ring plate is equal to the maximum thickness of the middle ring plate, so that the middle ring plate and the outer ring plate are The ring plate forms a first groove to avoid the coil. As for the electromagnetic attraction component of claim 9, the yoke core includes a first annular portion located on the outer ring of the mounting groove and a second annular portion located on the inner ring of the mounting groove, and the first annular portion The thickness of the first annular part is equal to the thickness of the second annular part, and the distance between the first annular part and the outer ring plate is equal to the distance between the second annular part and the inner ring plate. As for the electromagnetic attraction component of claim 10, a first air gap surface is formed between the first annular portion and the outer ring plate, and a second air gap surface is formed between the second annular portion and the inner ring plate. The first air gap surface and the second air gap surface are both perpendicular to the axis of the yoke core, and the first air gap surface and the second air gap surface are coplanar. As for the electromagnetic attraction component described in claim 5, the cross-sectional shape of the coil is rectangular; Or, the cross-sectional shape of the coil is a trapezoid adapted to the spatial cross-sectional shape of the magnetic circuit. As for the electromagnetic attraction component described in claim 1, the cross-sectional shape of the magnetic circuit space is an ordinary trapezoid, and the bottom surface of the installation groove and the corresponding surface are both tapered surfaces. As for the electromagnetic attraction component described in claim 13, the cross-sectional shape of the coil is rectangular; Or, the cross-sectional shape of the coil is a trapezoid adapted to the spatial cross-sectional shape of the magnetic circuit. A brake including the electromagnetic attraction component according to any one of claims 1 to 14.

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