Energy-saving permanent magnet brake

Abstract

The utility model relates to brake technology field provides an energy -conserving permanent -magnetic brake, including magnetic yoke, permanent magnet, coil, dynamic board and flange, dynamic board is arranged between magnetic yoke and flange, and is equipped with elastic part between dynamic board and flange to make dynamic board keep the trend of keeping away from magnetic yoke, magnetic yoke includes inner groove disc and outer groove disc, and outer groove disc fixedly covers and is equipped with in inner groove disc outside, and the annular groove of installing coil is formed between inner groove disc and outer groove disc side wall, and permanent magnet is located on inner groove disc and / or outer groove disc, and permanent magnet is made of the magnetic material with low coercive force and can remember current magnetic circuit operating point, the utility model little energy consumption, do not need to need to continuously exert current like existing brake, reach the purpose that saves energy consumption and reduces coil heating.

Description

Technical Field

[0001] This utility model relates to the field of brake technology, and more specifically, to an energy-saving permanent magnet brake. Background Technology

[0002] Brakes, as a commonly used actuator, can decelerate or stop mechanical moving parts, thereby achieving the purpose of control. Among them, permanent magnet brakes, as a type of brake, mainly operate in the form of power-off braking. Their working principle is as follows: When power is off, the magnetic field generated by the permanent magnet attracts the moving plate (also called the armature), forming a brake. When the coil is energized, a reverse electromagnetic force is generated to counteract the magnetic force generated by the permanent magnet. The moving plate is pulled back under the action of the spring, separating the moving plate from the magnetic yoke and releasing the brake.

[0003] However, existing power-off permanent magnet brakes require a constant current to be applied to the coil when the brake is released, resulting in high brake wear and severe heat generation. Utility Model Content

[0004] The purpose of this invention is to provide an energy-saving permanent magnet brake to overcome the aforementioned deficiencies of the prior art.

[0005] This utility model is achieved through the following technical solution: An energy-saving permanent magnet brake includes a yoke, a permanent magnet, a coil, a moving plate, and a flange. The moving plate is arranged between the yoke and the flange, and an elastic element is provided between the moving plate and the flange to keep the moving plate away from the yoke. The yoke includes an inner groove plate and an outer groove plate. The outer groove plate is fixedly sleeved on the outside of the inner groove plate. An annular groove for mounting the coil is formed between the side walls of the inner and outer groove plates. The permanent magnet is disposed on the inner groove plate and / or the outer groove plate. The permanent magnet is made of a magnetic material with low coercivity and the ability to remember the current magnetic circuit operating point.

[0006] Optionally, the inner groove plate is provided with a plurality of positioning grooves along the circumferential direction, and the inner side of the outer groove plate is provided with a plurality of mounting grooves along the circumferential direction, and the permanent magnet is provided in both the positioning grooves and the mounting grooves. Optionally, the permanent magnet on the inner groove plate is integrally cast therewith; the permanent magnet on the outer groove plate is integrally cast therewith.

[0007] Optionally, multiple sets of mounting slots are provided along the axial direction on the inner side of the outer groove plate.

[0008] Optionally, the surface of the moving plate that contacts the magnetic yoke is provided with a wear-resistant ring.

[0009] Optionally, the wear-resistant ring is made of copper or rubber.

[0010] Optionally, the elastic element is a spring sheet, which is fixed by riveting.

[0011] Optionally, the elastic element is a spring, and the moving plate is provided with a plurality of mounting countersunk holes at intervals along the circumferential direction near the end of the magnetic yoke. The flange and the moving plate are connected by mounting screws, and the heads of the mounting screws are located in the mounting countersunk holes. The spring is located between the bottom of the mounting countersunk hole and the head of the mounting screw.

[0012] The technical solution of this utility model has at least the following advantages and beneficial effects: In this utility model, the permanent magnet is made of a magnetic material with low coercivity and the ability to remember the current magnetic circuit operating point. This means it is easily magnetized by an external magnetic field, and can stably remember the current magnetic circuit operating point after the external magnetic field is removed. In practical applications, in the initial power-off state, the moving plate is attracted by the magnetic force of the permanent magnet, forming a braking effect. When it is necessary to release the braking, a current is applied to the coil to demagnetize the permanent magnet, thereby releasing the braking. When it is necessary to brake again, a reverse current is applied to the coil to remagnetize the permanent magnet, generating a magnetic force to attract the moving plate, thus forming braking again. This method consumes less energy and does not require a continuous current application like existing brakes, achieving the purpose of saving energy and reducing coil heating. Attached Figure Description

[0013] Figure 1 A cross-sectional view of an energy-saving permanent magnet brake provided in Embodiment 1; Figure 2 This is a schematic diagram of the installation method of the elastic element in Example 2; Reference numerals: 1-Outer groove plate, 101-Mounting groove, 2-Inner groove plate, 201-Positioning groove, 3-Permanent magnet, 4-Moving plate, 5-Flange, 6-Elastic element, 7-Wear-resistant ring, 8-Rivet, 9-Connecting screw, 10-Mounting screw. Detailed Implementation

[0014] Example 1 refer to Figure 1 An energy-saving permanent magnet brake includes a magnetic yoke, a permanent magnet 3, a coil, a moving plate 4, and a flange 5. The moving plate 4 is arranged between the magnetic yoke and the flange 5. An elastic element 6 is provided between the moving plate 4 and the flange 5 to keep the moving plate 4 away from the magnetic yoke. The magnetic yoke includes an inner grooved plate 2 and an outer grooved plate 1. The outer grooved plate 1 is fixedly sleeved on the outside of the inner grooved plate 2. An annular groove for mounting the coil is formed between the side walls of the inner grooved plate 2 and the outer grooved plate 1. In this embodiment, the outer grooved plate 1 and the inner grooved plate 2 can be connected and fixed together by connecting screws 9 arranged along the axial direction to maintain a whole. In other embodiments, the outer grooved plate 1 and the inner grooved plate 2 can also be fixed by other means, such as adhesive bonding.

[0015] The permanent magnet 3 is disposed on the inner slotted disk 2 and / or the outer slotted disk 1. That is, the permanent magnet 3 can be disposed only on the inner slotted disk 2, only on the outer slotted disk 1, or on both the inner slotted disk 2 and the outer slotted disk 1. It should be understood that several permanent magnets 3 should be disposed in the circumferential direction of the yoke.

[0016] The permanent magnet 3 is made of a magnetic material with low coercivity and the ability to remember the current operating point of the magnetic circuit. This means the permanent magnet 3 is easily magnetized by an external magnetic field, and can stably remember the current operating point after the external magnetic field is removed. In practical applications, in the initial power-off state, the moving plate 4 is attracted by the magnetic force of the permanent magnet 3, forming a braking effect. When it is necessary to release the braking, a current is applied to the coil to demagnetize the permanent magnet 3, thus releasing the braking. When it is necessary to brake again, a reverse current is applied to the coil to remagnetize the permanent magnet 3, generating a magnetic force to attract the moving plate 4, thus forming braking again. This method consumes less energy, as it does not require a continuous current application like existing brakes, achieving energy savings and reducing coil heating. It is particularly suitable for independent robots, solving the problems of coil heating and battery power consumption during braking.

[0017] In this embodiment, permanent magnets 3 are provided on both the inner slot 2 and the outer slot 1. Specifically, the inner slot 2 has several positioning slots 201 along the circumferential direction, and the inner side of the outer slot 1 has several mounting slots 101 along the circumferential direction. The positioning slots 201 and the mounting slots 101 are evenly spaced along the circumferential direction, and both the positioning slots 201 and the mounting slots 101 are provided with permanent magnets 3. In this way, it is equivalent to providing two layers of permanent magnets 3 in the axial direction of the yoke. It is easy to understand that when the power is initially off, the magnetic force of the two layers of permanent magnets 3 is superimposed, and they work together to attract the moving plate 4, increasing the magnetic energy product per unit volume, which indirectly increases the design torque of the permanent magnet brake. Furthermore, if the size allows, multiple sets of mounting slots 101 are provided along the axial direction on the inner side of the outer slot 1, that is, more layers of permanent magnets 3 are formed, which facilitates further increasing the design torque of the permanent magnet brake.

[0018] In this embodiment, the permanent magnet 3 is installed as follows: the permanent magnet 3 on the inner slot 2 is integrally cast with it; the permanent magnet 3 on the outer slot 1 is integrally cast with it, and then magnetized. In other embodiments, the permanent magnet 3 can also be installed in other ways, for example, after magnetization, the permanent magnet 3 can be directly installed in the positioning groove 201 on the inner slot 2 and the mounting groove 101 on the outer slot 1. It is worth noting that both of these methods can eliminate the need for a fixing bracket for the permanent magnet 3.

[0019] In practical applications, the permanent magnets 3 on the inner groove plate 2 and the permanent magnets 3 on the outer groove plate 1 are preferably made of the same material (in some embodiments, different materials can of course be selected). There are no restrictions on the specific materials. For example, alloy materials can be selected, and grades such as 1J21, 1J45, 1J27, and 1J346 can be selected.

[0020] The surface of the moving plate 4 that contacts the magnetic yoke is provided with a wear-resistant ring 7. Specifically, a corresponding annular groove is provided on the end face of the moving plate 4, and the wear-resistant ring 7 is embedded in the annular groove, or the wear-resistant ring 7 is directly bonded and fixed to the end face of the moving plate 4. It is worth noting that by adding the wear-resistant ring 7, the friction area between the moving plate 4 and the magnetic yoke is reduced, and the coefficient of friction can also be changed by the wear-resistant ring 7, thereby generating a larger torque with a minimum brake volume. As an option, the wear-resistant ring 7 can be made of copper or rubber, and of course, in other embodiments it can also be made of other wear-resistant materials.

[0021] In this embodiment, the elastic element 6 is a spring sheet, which is fixed by riveting with rivets 8. That is, several rivets 8 are riveted between the moving plate 4 and the moving plate 4, and the rivets 8 pass through the spring sheet.

[0022] Example 2 refer to Figure 2 The difference between this embodiment and Embodiment 1 is that, in this embodiment, the elastic element 6 is a spring. Furthermore, the movable plate 4, near the end of the magnetic yoke, has several countersunk holes spaced circumferentially. The flange 5 and the movable plate 4 are connected by the heads of the mounting screws 10, which are located within these countersunk holes. The spring is positioned between the bottom of the countersunk hole and the head of the mounting screw 10. In practical applications, the countersunk holes are evenly spaced circumferentially to ensure that the elastic force is evenly distributed on the movable plate 4. Moreover, this method allows for adjustment of the spring's preload by changing the screw depth of the mounting screws 10.

[0023] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An energy-saving permanent magnet brake, characterized in that, It includes a magnetic yoke, a permanent magnet, a coil, a moving plate, and a flange. The moving plate is arranged between the magnetic yoke and the flange. An elastic element is provided between the moving plate and the flange to keep the moving plate away from the magnetic yoke. The magnetic yoke includes an inner grooved plate and an outer grooved plate. The outer grooved plate is fixedly sleeved on the outside of the inner grooved plate. An annular groove for mounting the coil is formed between the side walls of the inner and outer grooved plates. The permanent magnet is disposed on the inner grooved plate and / or the outer grooved plate. The permanent magnet is made of a magnetic material with low coercivity and the ability to remember the current magnetic circuit operating point.

2. The energy-saving permanent magnet brake according to claim 1, characterized in that, The inner groove plate has several positioning grooves along the circumferential direction, and the inner side of the outer groove plate has several mounting grooves along the circumferential direction. The permanent magnet is provided in both the positioning grooves and the mounting grooves.

3. The energy-saving permanent magnet brake according to claim 2, characterized in that, The permanent magnet on the inner groove plate is integrally cast with it; the permanent magnet on the outer groove plate is integrally cast with it.

4. The energy-saving permanent magnet brake according to claim 3, characterized in that, Multiple sets of mounting slots are arranged axially on the inner side of the outer groove plate.

5. The energy-saving permanent magnet brake according to claim 1, characterized in that, The surface of the moving plate that contacts the magnetic yoke is provided with a wear-resistant ring.

6. The energy-saving permanent magnet brake according to claim 5, characterized in that, The wear-resistant ring is made of copper or rubber.

7. The energy-saving permanent magnet brake according to claim 1, characterized in that, The elastic element is a spring sheet, which is fixed by riveting.

8. The energy-saving permanent magnet brake according to claim 1, characterized in that, The elastic element is a spring. The moving plate has a number of mounting countersunk holes spaced apart along the circumference at one end near the magnetic yoke. The flange is connected to the moving plate by mounting screws, and the heads of the mounting screws are located inside the mounting countersunk holes. The spring is located between the bottom of the mounting countersunk hole and the head of the mounting screw.

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