Permanent magnet drum type electromagnetic brake

Abstract

The utility model relates to the technical field of brakes, and provides a permanent magnet drum type electromagnetic brake which comprises a machine shell, a stator, a reset element and a rotor and further comprises a permanent magnet magnetized in the radial direction, the rotor is arranged in the machine shell in a penetrating mode, the permanent magnet is fixedly arranged on the rotor in a sleeved mode, the stator is arranged on the outer side of the permanent magnet, and the reset element is connected between the stator and the machine shell. The stator is attracted by the permanent magnet to generate pressure during power loss, so that braking is formed; the magnetic force generated when the stator is electrified repels the magnetic force of the permanent magnet, the stator is pulled open by the reset element, and braking is relieved. Compared with a traditional drum-type electromagnetic brake, a mechanical force transmission structure is not needed, the structure is simplified, braking and braking releasing are achieved only through the action of a magnetic field, and the response speed is increased.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of brake, specifically, relates to a permanent magnetic drum type electromagnetic brake. BACKGROUND

[0002] The traditional drum type electromagnetic brake usually includes a brake drum, an armature, a brake shoe, an electromagnet, a return spring and a mechanical force transmission structure, when braking is needed, the coil of the electromagnet is powered, the coil generates a magnetic field, the iron core is magnetized, the armature is attracted, the movement of the armature pushes the brake shoe through the mechanical force transmission mechanism, the brake shoe expands outward to overcome the pulling force of the return spring, the friction material on the brake shoe is in close contact with the inner surface of the brake drum, friction is generated, the rotation of the brake drum is hindered, so that braking is realized, when the coil of the electromagnet is powered off, the magnetic field disappears, the iron core loses magnetism, under the action of the return spring, the brake shoe is pulled back to the initial position and separated from the inner surface of the brake drum, the brake drum can rotate freely, and the brake is in a released state.

[0003] It can be seen that the traditional drum type electromagnetic brake needs the mechanical force transmission mechanism, which not only causes complex structure, increases maintenance cost and difficulty, but also reduces response speed. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a permanent magnetic drum type electromagnetic brake to solve the above-mentioned defects of the prior art.

[0005] The utility model is realized through the following technical schemes:

[0006] A permanent magnetic drum type electromagnetic brake, comprising a casing, a stator, a reset element and a rotor, further comprising a permanent magnet magnetized along the radial direction, the rotor is arranged in the casing, the permanent magnet is fixedly arranged on the rotor, the stator is arranged outside the permanent magnet, and the reset element is connected between the stator and the casing.

[0007] The stator is attracted by the permanent magnet to generate pressure when power is lost, forming braking, when the stator is powered, the magnetic force generated by the stator and the magnetic force of the permanent magnet repel each other, the stator is pulled open by the reset element, and the braking is released.

[0008] Optionally, the stator is provided with at least one pair and is symmetrically arranged on both sides of the permanent magnet.

[0009] Optionally, the outer fixed sleeve of the permanent magnet is provided with a friction plate.

[0010] Optionally, the side surface of the stator is provided with a guide block.

[0011] Optionally, the permanent magnet and the rotor are adhesively fixed.

[0012] Optionally, a shaft sleeve made of non-magnetic material is fixedly arranged on the rotor, and the permanent magnet is fixedly arranged on the shaft sleeve.

[0013] Optionally, the permanent magnet is a magnetic steel.

[0014] Optionally, the reset element is a tension spring.

[0015] The technical scheme of the utility model has at least the following advantages and beneficial effects: in the utility model, a permanent magnet is used as a pressure source, the permanent magnet is magnetized along a radial direction, the stator is attracted by the permanent magnet to generate pressure in an electrified state, thereby forming braking; the magnetic force generated by the stator in the electrified state repels the magnetic force of the permanent magnet, the stator is pulled apart by the reset element, thereby releasing the braking; compared with a traditional drum electromagnetic brake, the utility model does not need a mechanical force transmission structure, simplifies the structure, and only uses the effect of a magnetic field to realize braking and releasing the braking, thereby improving response speed. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 A structure diagram of a permanent magnetic drum electromagnetic brake provided for example 1 is shown in the figure;

[0017] Figure 2 A structure diagram of a permanent magnetic drum electromagnetic brake provided for example 2 is shown in the figure;

[0018] Figure 3 A detailed view of A in the figure is shown in the figure; Figure 2

[0019] Reference signs: 1 - machine shell, 2 - stator, 3 - reset element, 4 - rotor, 5 - permanent magnet, 6 - friction plate, 7 - guide block, 8 - shaft sleeve. DETAILED DESCRIPTION

[0020] Example 1

[0021] Reference Figure 1 A permanent magnetic drum electromagnetic brake, comprising a machine shell 1, a stator 2, a reset element 3, a rotor 4, and a permanent magnet 5 magnetized along a radial direction (i.e., the magnetization direction of the permanent magnet 5 is radial magnetization).

[0022] The rotor 4 is a power output shaft, which is arranged in the machine shell 1 and rotates under the action of power in operation, as an option, the permanent magnet 5 is a magnetic steel, which is in a sleeve shape and fixedly arranged on the rotor 4, i.e., rotates together with the rotor 4, as an option, the permanent magnet 5 is adhesively fixed to the rotor 4 in the example. The stator 2 is a combination of a magnetic yoke and a coil, which is arranged outside the permanent magnet 5, the reset element 3 is connected between the stator 2 and the machine shell 1, as an option, the reset element 3 is a tension spring in the example.

[0023] ​When the stator 2 is powered off, it will be attracted by the permanent magnet 5 due to its own magnetism, thus forming a brake; when the stator 2 is powered on, the magnetic force generated by the stator 2 and the magnetic force of the permanent magnet 5 repel each other (i.e., the stator 2 and the permanent magnet 5 have the same opposite surface magnetic poles when powered on), and the stator 2 is pulled away by the reset element 3, thus releasing the brake. Compared with the traditional drum electromagnetic brake, the mechanical force transmission structure is not needed, the structure is simplified, and the brake and release of the brake are realized only through the action of the magnetic field, thus improving the response speed.

[0024] In this embodiment, the stator 2 is provided with a guide block 7 on the side surface, the guide block 7 is made of non-magnetic material, and the magnetic field is avoided. The guide block 7 limits the position of the stator 2 and improves the guidance of the movement of the stator 2. Further, in this embodiment, the stator 2 is provided in pairs and symmetrically arranged on both sides of the permanent magnet 5, thus improving the stability of the brake. In other embodiments, of course, more pairs of stators 2 can be provided to improve the braking effect.

[0025] In this embodiment, the outer fixed sleeve of the permanent magnet 5 is provided with a friction plate 6, that is, the stator 2 rubs against the friction plate 6 to generate torque when braking. As an option, the friction plate 6 is adhesively fixed to the permanent magnet 5 in this embodiment.

[0026] Embodiment 2

[0027] Reference Figure 2 and Figure 3 A permanent magnet drum electromagnetic brake, comprising a housing 1, a stator 2, a reset element 3, a rotor 4, and a permanent magnet 5 magnetized in the radial direction (i.e., the permanent magnet 5 is magnetized in the radial direction).

[0028] The rotor 4 is a power output shaft, which is arranged inside the housing 1 and rotates under the action of power during operation. As an option, the permanent magnet 5 is a magnetic steel and has a sleeve shape as a whole, and is fixedly sleeved on the rotor 4, that is, rotates together with the rotor 4. In this embodiment, a shaft sleeve 8 made of non-magnetic material is fixedly sleeved on the rotor 4, and the permanent magnet 5 is fixedly sleeved on the shaft sleeve 8. The shaft sleeve 8 can prevent the magnetic lines from directly penetrating through the rotor 4, forcing the magnetic lines to close in the loop composed of the permanent magnet 5 and the shaft sleeve 8, thus reducing the magnetization effect on the rotor 4. As an option, the shaft sleeve 8 and the rotor 4 are connected by splines in this embodiment, so that they rotate synchronously, and the permanent magnet 5 is adhesively fixed on the shaft sleeve 8.

[0029] The stator 2 is a combination of a magnetic yoke and a coil, and is arranged outside the permanent magnet 5. The reset element 3 is connected between the stator 2 and the casing 1, and is a tension spring in this embodiment. When the stator 2 loses power, it is attracted by the permanent magnet 5 due to its own magnetism, and generates pressure, thereby forming a brake. When the stator 2 is powered, the magnetic force generated by the stator 2 and the magnetic force of the permanent magnet 5 repel each other (i.e., the opposite faces of the stator 2 and the permanent magnet 5 have the same magnetic pole), and the stator 2 is pulled apart by the reset element 3, thereby releasing the brake. Compared with a conventional drum electromagnetic brake, the mechanical force transmission structure is not required, the structure is simplified, and the brake and the release of the brake are realized only by the action of a magnetic field, thereby improving the response speed.

[0030] In this embodiment, the stator 2 is provided with a guide block 7 on the side surface, and the guide block 7 is made of a non-magnetic material to avoid affecting the magnetic field. The guide block 7 limits the position of the stator 2 and improves the guidance of the movement of the stator 2. Further, in this embodiment, the stator 2 is arranged in pairs and symmetrically arranged on both sides of the permanent magnet 5, thereby improving the stability of the brake. In other embodiments, the stator 2 can of course be arranged in more pairs to improve the braking effect.

[0031] In this embodiment, the permanent magnet 5 is fixedly provided with a friction plate 6, i.e., the stator 2 rubs against the friction plate 6 to generate a torque when braking. Alternatively, the friction plate 6 is adhesively fixed to the permanent magnet 5 in this embodiment.

[0032] The above is only a preferred embodiment of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A permanent magnet drum type electromagnetic brake comprising a housing, a stator, a reset element and a rotor, characterized in that, The magnet is a radial magnet, the rotor is arranged in the shell, the magnet is fixed on the rotor, the stator is arranged outside the magnet, and the reset element is connected between the stator and the shell. The stator is attracted by the magnet to generate pressure when losing power, thereby forming braking. The magnetic force generated by the stator when powered on and the magnetic force of the magnet repel each other, the stator is pulled apart by the reset element, and the braking is released.

2. The permanent magnet drum electromagnetic brake of claim 1, wherein, The stator is provided with at least one pair and is symmetrically arranged on both sides of the magnet.

3. The permanent magnet drum electromagnetic brake of claim 1, wherein, The outer fixed sleeve of the magnet is provided with a friction plate.

4. The permanent magnet drum electromagnetic brake of claim 1, wherein, The side surface of the stator is provided with a guide block.

5. The permanent magnet drum electromagnetic brake of claim 1, wherein, The magnet is adhesively fixed to the rotor.

6. The permanent magnet drum electromagnetic brake of claim 1, wherein, The shaft sleeve made of non-magnetic material is fixed on the rotor, and the magnet is fixed on the shaft sleeve.

7. The permanent magnet drum electromagnetic brake of claim 1, wherein, The magnet is a magnetic steel.

8. The permanent magnet drum electromagnetic brake of claim 1, wherein, The reset element is a tension spring.

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