Ultrathin permanent magnet brake

Abstract

The utility model discloses an ultrathin permanent magnet brake which comprises a plurality of sheet-shaped permanent magnets, a permanent magnet framework, a first base, a second base, a coil, a rotor and a sheet-shaped spring. Wherein the plurality of sheet-shaped permanent magnets are mounted in a plurality of mounting grooves formed in the permanent magnet framework; the permanent magnet framework is tightly attached between the first base and the second base; three first threaded through holes are formed in the outer ring of the sheet-shaped spring, and three second threaded through holes are formed in the inner ring of the sheet-shaped spring; the rotor is provided with three third threaded through holes corresponding to the three first threaded through holes, and the rotor and the sheet spring are fixedly connected through the first threaded through holes, the third threaded through holes and screws. The three second threaded through holes in the inner ring of the sheet spring are used for being fixedly connected with a rotor of an external motor.

Description

Technical Field

[0001] This utility model relates to the field of brake technology, specifically to an ultra-thin permanent magnet brake. Background Technology

[0002] Brakes, as a safety braking component, are widely used in harmonic joint modules. Their advantages, such as small size, ease of installation and control, and high reliability and stability, have made them a standard accessory for harmonic joint modules. In recent years, due to the rapid development of service robots, increasingly stringent requirements have been placed on the size and weight of harmonic deceleration joint modules. Smaller size, lighter weight, and greater braking torque have become one of the development directions for brakes.

[0003] Based on their operating principles, brake products on the market can be mainly divided into two categories: spring-loaded electromagnetic brakes and permanent magnet brakes. Permanent magnet brakes use permanent magnets as the pressure source between the rotor and stator after power is cut off. Compared to spring-loaded electromagnetic brakes, which use a spring as the pressure source, their axial length can be significantly reduced. Secondly, their main structure consists only of the rotor and stator, making them simpler than spring-loaded electromagnetic brakes which have an armature, friction pads, upper plate, and base. Finally, permanent magnet brakes do not have traditional non-metallic friction pads, avoiding noise and dust generation during operation. Due to their ease of achieving small size and lightweight design, permanent magnet brakes have rapidly replaced spring-loaded electromagnetic brakes, becoming the safety brake component used in harmonic joint modules of service robots.

[0004] Thin and lightweight permanent magnet brakes suffer from insufficient structural strength in practical applications. Therefore, improving the structure of permanent magnet brakes to ensure sufficient strength has become an urgent problem to be solved. Utility Model Content

[0005] In view of this, the present invention provides an ultra-thin permanent magnet brake to solve the problem that the structural strength of the existing thin and light permanent magnet brake is not reliable enough.

[0006] This utility model embodiment provides an ultra-thin permanent magnet brake, including a plurality of sheet-shaped permanent magnets, a permanent magnet skeleton, a first base, a second base, a coil, a rotor, and a sheet spring; wherein, the plurality of sheet-shaped permanent magnets are installed in a plurality of mounting slots opened on the permanent magnet skeleton; the permanent magnet skeleton is tightly fitted between the first base and the second base; the outer ring of the sheet spring has three first threaded through holes, and the inner ring of the sheet spring has three second threaded through holes; the rotor has three third threaded through holes corresponding to the three first threaded through holes, and the rotor and the sheet spring are fixedly connected through the first threaded through holes, the third threaded through holes, and screws; the three second threaded through holes in the inner ring of the sheet spring are used for fixed connection with the rotor of an external motor.

[0007] Optionally, the permanent magnet frame is fitted onto the first base, and the second base is nested above the first base; the first base and the second base are fixedly connected by a number of screws.

[0008] Optionally, the coil is a copper coil wound with hot-melt or alcohol-soluble copper wire; the coil is fixed in an annular groove in the first base and the second base by potting adhesive.

[0009] Optionally, a plurality of mounting slots are evenly distributed on the permanent magnet frame, and a clearance hole is provided between two adjacent mounting slots; the position of the clearance hole corresponds to the position of the threaded through hole on the first base and the second base; the diameter of the clearance hole on the permanent magnet frame is greater than or equal to the diameter of the threaded through hole on the first base and the second base.

[0010] Alternatively, the rotor and the leaf spring can be fixedly connected by flat-head screws.

[0011] Optionally, it also includes a washer disposed between the flat-head screw and the leaf spring.

[0012] Optionally, a corresponding groove is provided at the screw hole opening at the bottom of the first base; the first base and the second base are fixedly connected by a number of countersunk screws, the height of the head of the countersunk screws being lower than the height of the groove of the first base.

[0013] Optionally, the rotor, the first base, and the second base are circular rings with the same inner and outer diameters in projection.

[0014] Optionally, the inner ring of the leaf spring is a circular ring, and the outer ring of the leaf spring extends outward with three connecting lugs.

[0015] The beneficial effects of this utility model are:

[0016] 1. This ultra-thin permanent magnet brake is designed specifically for lightweight applications. In lightweight models, the thickness of the permanent magnet part becomes very thin. The ring-shaped integral permanent magnet is brittle and hard, making it difficult to process and unfavorable for mass production. Designing the integral permanent magnet into discrete permanent magnet pieces facilitates processing and manufacturing. At the same time, by adjusting the size and number of discrete permanent magnets, the braking torque can be easily adjusted. The base parts have a high reusability rate, indirectly reducing manufacturing costs and facilitating mass production.

[0017] 2. Many clearance holes can be opened on the mounting surface of the permanent magnet frame to facilitate the drilling of threaded fixing holes in the base when it is extremely thin, and to prevent the mounting screws from damaging the copper coil and permanent magnet.

[0018] 3. The copper coil does not use an insulated solid skeleton, but is wound with hot-melt or alcohol-soluble copper wire. The coil space is extremely small, and even with very fine copper wire, coils with high dimensional accuracy can still be wound, which is conducive to mass production and modular manufacturing. Attached Figure Description

[0019] The features and advantages of this utility model will be more clearly understood by referring to the accompanying drawings. The drawings are schematic and should not be construed as limiting the utility model in any way. In the drawings:

[0020] Figure 1 An exploded view of an ultrathin permanent magnet brake according to an embodiment of the present invention is shown;

[0021] Figure 2 A structural diagram of an ultrathin permanent magnet brake according to an embodiment of the present invention is shown;

[0022] Figure 3 A cross-sectional view of an ultrathin permanent magnet brake according to an embodiment of the present invention is shown;

[0023] Figure 4 This diagram illustrates the state of an ultra-thin permanent magnet brake in an embodiment of the present invention when it is energized and released.

[0024] Figure 5 The diagram shows the state of an ultra-thin permanent magnet brake in the embodiment of this utility model when braking is interrupted by power. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0026] like Figure 1 and Figure 2As shown, this utility model embodiment provides an ultra-thin permanent magnet brake, including a plurality of sheet-like permanent magnets 1, a permanent magnet frame 2, a first base 3, a second base 4, a coil 5, a rotor 6, a sheet spring 7, and potting compound 8; wherein, the plurality of sheet-like permanent magnets 1 are installed in a plurality of mounting slots opened on the permanent magnet frame 2; the permanent magnet frame 2 is sleeved on the first base 3, and the second base 4 is nested above the first base 3; the first base 3 and the second base 4 are fixedly connected by a plurality of screws; the permanent magnet frame 2 is tightly fitted between the first base 3 and the second base 4; The coil 5 is fixed in the annular groove of the first base 3 and the second base 4 by potting compound 8; the coil 5 is a copper wire coil wound with hot-melt or alcohol-soluble copper wire; the outer ring of the leaf spring 7 has three first threaded through holes, and the inner ring of the leaf spring 7 has three second threaded through holes; the rotor 6 has three third threaded through holes corresponding to the three first threaded through holes, and the rotor 6 and the leaf spring 7 are fixedly connected by the first threaded through holes, the third threaded through holes and screws; the three second threaded through holes in the inner ring of the leaf spring 7 are used for fixed connection with the rotor of an external motor. Figure 3 As shown, after the first base 3 and the second base 4 are fixed, a boss is provided on the upward protruding edge of the first base. The annular groove of the inner ring of the second base is at the same height as the boss of the first base. There is a gap between the two. The gap between the first base, the second base and the coil is filled with potting compound 8. The potting compound is flush with the surface of the first base and the second base.

[0027] In a specific embodiment, the sheet-like permanent magnet 1 is arc-shaped, with its inner and outer rings being partially concentric circles, and its ends being semicircles. The permanent magnet frame 2 has several mounting slots evenly distributed on it. In this embodiment, the braking torque can be adjusted by changing the size and number of the sheet-like permanent magnets. The base parts have a high reusability rate, indirectly reducing manufacturing costs and facilitating mass production.

[0028] The permanent magnet frame 2 has several evenly distributed mounting slots, with clearance holes between adjacent mounting slots. The positions of these clearance holes correspond to the positions of the threaded through holes on the first base 3 and the second base 4. The diameter of the clearance holes on the permanent magnet frame 2 is greater than or equal to the diameter of the threaded through holes on the first base 3 and the second base 4. By providing these clearance holes, damage to the copper coil and permanent magnet is prevented from the mounting screws when threaded fixing holes are drilled under conditions of extremely thin parts.

[0029] like Figure 3 As shown, the rotor 6, the first base 3, and the second base 4 are all circular rings with the same inner and outer diameters in projection. The inner ring of the leaf spring 7 is a circular ring, and the outer ring of the leaf spring 7 extends outward with three connecting lugs. The leaf spring 7 is fixedly connected to the rotor 6 through threaded through holes opened on the connecting lugs and flat-head screws 9. A washer 10 is provided between the flat-head screws 9 and the leaf spring 7.

[0030] The first base 3 has a corresponding groove at the bottom screw hole opening. The first base 3 and the second base 4 are fixedly connected by a number of countersunk screws 11, the height of the head of the countersunk screw 11 being lower than the height of the groove in the first base 3.

[0031] The working principle of the ultra-thin permanent magnet brake provided in this embodiment is as follows:

[0032] Magnetic field lines closed loop such as Figure 4 and Figure 5 As shown, when power is off, magnetic lines of force travel from the N and S poles of the permanent magnet through the first and second bases to the inner and outer friction plane ring surfaces formed by the two bases. With a suitable air gap distance between this plane and the rotor friction surface, effective air gap magnetic reluctance is generated, thus creating an attractive force on the rotor. This causes the rotor friction surface to adhere to the base friction surface. The positive pressure generated by the attractive force creates a frictional torque between them, thus acting as a brake. At this time, the leaf spring deforms to generate a small restoring force. When power is applied, the coil generates a magnetic field with a strength comparable to that of the permanent magnet but with opposite polarity. This weakens the equivalent magnetic force in the brake base section. When the restoring force of the leaf spring exceeds the attractive force of the base section on the rotor, the rotor is reset by the leaf spring and pulled away from the base. At this point, the braking force disappears, and the motor rotor can operate normally.

[0033] This ultra-thin permanent magnet brake is designed specifically for lightweight applications. In lightweight models, the thickness of the permanent magnet portion becomes very thin. The ring-shaped integral permanent magnet is brittle and hard, making it difficult to process and hindering mass production. Designing the integral permanent magnet into discrete permanent magnet pieces facilitates processing and manufacturing. At the same time, by adjusting the size and number of discrete permanent magnet pieces, the braking torque can be easily adjusted. The high reusability of the base parts indirectly reduces manufacturing costs and facilitates mass production.

[0034] Many clearance holes can be made on the mounting surface of the permanent magnet frame to prevent damage to the copper coil and permanent magnet when threaded fixing holes are made in the base when it is extremely thin.

[0035] Copper coils do not use an insulated solid skeleton, but are wound with hot-melt or alcohol-soluble copper wire. The coil space is extremely small, and even with very fine copper wire, coils with high dimensional accuracy can still be wound, which is conducive to mass production and modular manufacturing.

[0036] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. An ultra-thin permanent magnet brake, characterized in that, The device includes several sheet-shaped permanent magnets (1), a permanent magnet frame (2), a first base (3), a second base (4), a coil (5), a rotor (6), and a sheet spring (7). Several sheet-shaped permanent magnets (1) are installed in several mounting slots on the permanent magnet frame (2). The permanent magnet frame (2) is tightly fitted between the first base (3) and the second base (4). The outer ring of the sheet spring (7) has three first threaded through holes, and the inner ring of the sheet spring (7) has three second threaded through holes. The rotor (6) has three third threaded through holes corresponding to the three first threaded through holes. The rotor (6) and the sheet spring (7) are fixedly connected through the first threaded through holes, the third threaded through holes, and screws. The three second threaded through holes on the inner ring of the sheet spring (7) are used for fixed connection with the rotor of an external motor.

2. The ultra-thin permanent magnet brake according to claim 1, characterized in that, The permanent magnet frame (2) is sleeved on the first base (3), and the second base (4) is nested above the first base (3); the first base (3) and the second base (4) are fixedly connected by a number of screws.

3. The ultra-thin permanent magnet brake according to claim 1, characterized in that, The coil (5) is a copper coil wound with hot-melt or alcohol-soluble copper wire; the coil (5) is fixed in the annular groove in the first base (3) and the second base (4) by potting glue (8).

4. The ultra-thin permanent magnet brake according to claim 1, characterized in that, The permanent magnet skeleton (2) has a number of mounting slots evenly distributed, and a clearance hole is provided between two adjacent mounting slots; the position of the clearance hole corresponds to the position of the threaded through hole on the first base (3) and the second base (4); the diameter of the clearance hole on the permanent magnet skeleton (2) is greater than or equal to the diameter of the threaded through hole on the first base (3) and the second base (4).

5. The ultra-thin permanent magnet brake according to claim 1, characterized in that, The rotor (6) and the leaf spring (7) are fixedly connected by flat-head screws.

6. The ultra-thin permanent magnet brake according to claim 5, characterized in that, Also includes: A washer is disposed between the flat-head screw and the leaf spring (7).

7. The ultra-thin permanent magnet brake according to claim 1, characterized in that, The first base (3) has a corresponding groove at the bottom screw hole opening; the first base (3) and the second base (4) are fixedly connected by a number of countersunk screws, and the height of the head of the countersunk screw is lower than the height of the groove of the first base (3).

8. The ultra-thin permanent magnet brake according to claim 1, characterized in that, The rotor (6), the first base (3), and the second base (4) are circular rings with the same inner and outer diameters in projection.

9. The ultra-thin permanent magnet brake according to claim 8, characterized in that, The inner ring of the leaf spring (7) is a circular ring, and the outer ring of the leaf spring (7) extends outward with three connecting lugs.

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