Shaded-pole gear motor capable of rapidly stopping in power failure

Abstract

The utility model discloses a shaded pole speed reduction motor capable of rapidly stopping in power failure, which comprises a rotor assembly capable of axially floating, a spring and a rotation resisting component, the spring is sleeved on the rotor assembly and is abutted against the rotor assembly along the axial direction, and the rotation resisting component and the spring are arranged at the same end or two ends of the rotor assembly; when the shaded-pole gear motor is powered on, the spring contracts, and the rotor assembly runs in a suspended mode, and when the shaded-pole gear motor is powered off, the rotor assembly returns to the initial position through the spring, and the rotation resisting component starts to work to prevent the rotor assembly from rotating. According to the utility model, the characteristic that the rotor assembly in the floatable shaded-pole gear motor can move left and right is utilized, and a simple clutch structure is applied, so that the rotation stopping component intervenes in work when the rotor assembly needs to be stopped, and the friction loss in the rotation process of the rotor assembly is avoided.

Description

Technical Field

[0001] The utility model relates to the field of intelligent equipment, in particular to a shaded-pole reduction motor capable of quickly stopping upon power failure. Background Art

[0002] Compared with other shaded-pole motors whose rotor assemblies are fixed at both ends with bearings, the shaded-pole reduction motor with rotor assemblies that can float left and right can float the rotor of the motor along the axial direction, exerting less axial force on the bearings and extending the service life of the bearings. However, this shaded-pole reduction motor also has problems. After the motor is powered off, the inertia of the rotor will still rotate a certain number of times. Under the use conditions with strict displacement and angle requirements, the inertial rotation will make the product performance fail to meet expectations. The general solution on the market, as described in patent CN117856484A, is to add a spring to one side of the motor rotor and apply pressure to it through the spring to achieve the effect of rapid stopping. However, under this solution, the rotor is always in contact with the damping plate during rotation, and the friction force is relatively large. The shaded-pole motor itself has a small torque, and the torque requirements of the applied working conditions are also relatively high. Therefore, it is necessary to minimize the friction during operation. Utility Model Content

[0003] In order to solve the technical problems in the prior art that shaded-pole reduction motors with floating rotor assemblies have displacement, low angular accuracy or insufficient rotational torque, the utility model provides a shaded-pole reduction motor that stops quickly when power is cut off to solve the above problems.

[0004] The utility model adopts the following technical solution to solve the technical problem: a shaded-pole reduction motor that stops quickly when power is cut off, comprising an axially floating rotor assembly, a spring and an anti-rotation component, wherein the spring is sleeved on the rotor assembly and abuts against the rotor assembly axially, and the anti-rotation component and the spring are arranged at the same end or both ends of the rotor assembly; when the shaded-pole reduction motor is powered on, the spring contracts and the rotor assembly runs in suspension, and when the shaded-pole reduction motor is powered off, the rotor assembly returns to an initial position through the spring, and the anti-rotation component starts to work to prevent the rotor assembly from rotating.

[0005] Furthermore, the shaded-pole reduction motor also includes end covers rotatably connected to both ends of the rotor assembly, one end cover is a reduction box, the other end cover is a cover plate, a stator core is fixed between the two end covers, and the spring is against the rotor assembly and the cover plate.

[0006] Furthermore, the anti-rotation component is a damping element, which is arranged on the end surface of the rotor assembly away from the spring. When the shaded-pole reduction motor is powered off, the anti-rotation component abuts against the rotor assembly and one end cover of the shaded-pole reduction motor at the same time.

[0007] Furthermore, a plurality of ribs protruding toward the anti-rotation component are provided on the end cover at one end where the anti-rotation component is located, and the ribs extend radially along the rotor assembly. When the shaded-pole reduction motor is powered off, the anti-rotation component abuts against the ribs.

[0008] Furthermore, the anti-rotation component is a one-way bearing, the rotor assembly is separated from or in contact with the one-way bearing through axial floating, and the installation direction of the one-way bearing is opposite to the inertial rotation direction of the rotor assembly.

[0009] Furthermore, the one-way bearing is arranged in an end cover at one end of the shaded-pole reduction motor, one end of the rotor assembly extends into the one-way bearing, and the spring is located at the other end of the rotor assembly.

[0010] Furthermore, the reduction box of the shaded-pole reduction motor includes an upper cover, a lower cover and a gear set. The lower cover is arranged close to the inner side, and an installation groove for accommodating a one-way bearing is provided at one end of the upper cover facing the lower cover.

[0011] Furthermore, a conical structure is provided at one end of the rotor assembly facing the one-way bearing, and a diameter of the conical structure gradually increases from the end facing the one-way bearing to the end away from the one-way bearing.

[0012] Furthermore, the rotor assembly includes an integrally arranged rotor shaft and a cast aluminum rotor, wherein one end of the cast aluminum rotor facing the spring is provided with a rotor slot, and one end of the spring extends into the rotor slot and abuts against the cast aluminum rotor.

[0013] Furthermore, a gasket is connected to one end of the spring away from the cast aluminum rotor, and the gasket abuts against the end cover of the shaded-pole reduction motor.

[0014] The beneficial effects of the utility model are:

[0015] The utility model utilizes the characteristic that the rotor assembly in the floating shaded-pole reduction motor can move left and right, and uses a simple clutch structure to enable the anti-rotation component to intervene when the rotor assembly needs to stop, thereby avoiding friction loss during the rotation of the rotor assembly. The patented technology can be applied to the field of servo motor drive and control integrated systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0017] Figure 1 It is an axial cross-sectional view corresponding to the first embodiment of the shaded-pole reduction motor capable of rapid stopping when power is cut off described in the utility model;

[0018] Figure 2 It is an exploded view of the reduction box in the shaded-pole reduction motor capable of rapid stopping upon power failure described in the utility model;

[0019] Figure 3 yes Figure 2 A three-dimensional view of the middle and lower cover;

[0020] Figure 4 This is an axial cross-sectional view corresponding to the second embodiment of the shaded-pole reduction motor capable of rapid stopping when power is cut off described in the utility model;

[0021] Figure 5 yes Figure 4 Assembly diagram of the one-way bearing;

[0022] Figure 6 It is a schematic diagram of the assembly of the spring in the utility model.

[0023] In the figure, 1, rotor assembly, 101, rotor shaft, 102, cast aluminum rotor, 2, spring, 3, damping element, 4, reduction gear box, 401, upper cover, 402, lower cover, 403, gear set, 404, output shaft, 5, cover plate, 6, stator core, 7, bearing, 8, rib, 9, one-way bearing, 10, mounting groove, 11, rotor groove, 12, gasket, 13, conical structure. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0025] Embodiment 1

[0026] like Figure 1-Figure 3 As shown, a shaded-pole reduction motor that stops quickly when power is cut off comprises an axially floating rotor assembly 1, a spring 2 and an anti-rotation component. The axial floating of the rotor assembly 1 means that the rotor assembly 1 can move in the left and right directions in the figure, the spring 2 is sleeved on the rotor assembly 1 and axially abuts against the rotor assembly 1, and the anti-rotation component and the spring 2 are arranged at the same end or both ends of the rotor assembly 1; when the shaded-pole reduction motor is powered on, the spring 2 contracts and the rotor assembly 1 runs in suspension, and when the shaded-pole reduction motor is powered off, the rotor assembly 1 returns to the initial position through the spring 2, and the anti-rotation component starts to work to prevent the rotor assembly 1 from rotating.

[0027] When the shaded-pole reduction motor is initially powered on, the stator is powered on to generate a magnetic field, and the rotor assembly 1 is attracted by the stator to move axially. The spring 2 is set at one end of the moving direction of the rotor assembly 1 at the beginning of power-on. The rotor assembly 1 moves toward the side of the spring 2, compresses the spring 2, and disengages from the anti-rotation component. The rotor assembly 1 works and rotates in a suspended state. After power is cut off, the magnetic field disappears, and the rotor assembly 1 moves toward the anti-rotation component under the action of the spring 2, achieving a quick stop effect.

[0028] The shaded-pole reduction motor further includes end covers rotatably connected to both ends of the rotor assembly 1, wherein one end cover is a reduction box 4, and the other end cover is a cover plate 5, and a stator core 6 is fixed between the two end covers. The spring 2 is installed at a position determined according to the working characteristics of the rotor assembly 1. If the rotor assembly 1 moves toward one end of the reduction box 4 when power is supplied, the spring 2 is arranged between the rotor assembly 1 and the reduction box 4. If the rotor assembly 1 moves toward one end of the cover plate 5 when power is supplied, the spring 2 is arranged between the rotor assembly 1 and the cover plate 5. Normally, the rotor assembly 1 moves toward one end of the cover plate 5 when power is supplied, so the spring 2 is usually against between the rotor assembly 1 and the cover plate 5.

[0029] The structure of the reduction box 4 is as follows Figure 2 As shown, it includes an upper cover 401, a lower cover 402 and a gear set 403. The upper cover 401 and the lower cover 402 are covered to form a box body. The gear set 403 is located in the box body. The primary gear of the gear set 403 is connected to the rotor assembly 1, and the final gear of the gear set 403 is connected to the output shaft 404 to drive the client to move.

[0030] like Figure 1 and Figure 6 As shown, the rotor assembly 1 includes a rotor shaft 101 and a cast aluminum rotor 102, which are an integrated structure. The rotor shaft 101 is rotatably connected to the reduction box 4 and the cover plate 5 through the bearing 7. The two ends of the rotor shaft 101 are not fixed to the bearing 7, so it can slide left and right.

[0031] like Figure 6 As shown, the cast aluminum rotor 102 is provided with a rotor slot 11 at one end facing the spring 2, and one end of the spring 2 extends into the rotor slot 11 and abuts against the cast aluminum rotor 102. The diameter of the rotor slot 11 is adapted to the spring 2, which can limit and fix the spring 2 on the one hand, and prevent the spring 2 from twisting during rotation and deforming during compression on the other hand. In a further design, a gasket 12 is connected to the other end of the spring 2, and the gasket 12 abuts against the end cover of the shaded-pole reduction motor. In this embodiment, it abuts against the cover plate 5, and is connected to the cover plate 5 through the gasket 12. The friction between the gasket 12 and the cover plate 5 is less than the friction between the metal spring 2 directly contacting the cover plate 5, thereby avoiding unnecessary friction generated by the spring 2 during the movement of the rotor shaft 101.

[0032] The anti-rotation component in this embodiment is a damping element 3, such as wool felt, which is arranged on the end surface of the rotor assembly 1 away from the spring 2. When the shaded-pole reduction motor is powered off, the anti-rotation component abuts against the rotor assembly 1 and one end cover of the shaded-pole reduction motor at the same time. For the shaded-pole reduction motor with the spring 2 arranged at one end of the cover plate 5, the damping element 3 is located on the rotor assembly 1 close to the gear box, such as Figure 1As shown, the anti-rotation component is located at the left end of the cast aluminum rotor 102. When the motor is powered off, the rotor assembly 1 is subjected to the force of the spring 2, compressing the anti-rotation component to contact the lower cover 402, and the anti-rotation component is compressed and deformed, increasing the friction between the anti-rotation component and the lower cover 402, thereby reducing the number of turns of the rotor shaft 101 when the power is off. As a preferred embodiment, a plurality of ribs 8 protruding toward the anti-rotation component are provided on the end cover where the anti-rotation component is located, and the ribs 8 extend along the radial direction of the rotor assembly 1. When the shaded-pole reduction motor is powered off, the anti-rotation component abuts against the ribs 8. When the anti-rotation component is located between the cast aluminum rotor 102 and the reduction box 4 (the spring 2 is located between the cover plate 5 and the cast aluminum rotor 102), the ribs 8 are located on the end face of the lower cover 402 of the reduction box 4. When the anti-rotation component is located between the cast aluminum rotor 102 and the cover plate 5 (the spring 2 is located between the reduction box 4 and the cast aluminum rotor 102), the ribs 8 are located on the end face of the cover plate 5.

[0033] In addition to wool felt, other damping materials can also be used. In this embodiment, the anti-rotation component can be installed between the rotor shaft 101 and the lower cover 402, or between the rotor shaft 101 and the upper cover 401. If the product use conditions permit, the end surface of the rotor shaft 101 in contact with the end cover can be made rough to increase resistance.

[0034] Embodiment 2

[0035] The anti-rotation component of this embodiment is different from that of the first embodiment. The anti-rotation component in this embodiment is a one-way bearing 9. The rotor assembly 1 is separated from or in contact with the one-way bearing 9 through axial floating. The installation direction of the one-way bearing 9 is opposite to the inertial rotation direction of the rotor assembly 1. The inertial rotation direction of the rotor assembly 1 is the rotation direction of the rotor shaft 101 when the motor is working normally. The installation direction of the one-way bearing 9 refers to the rotatable direction of the one-way bearing 9. When the motor is running, the rotor shaft 101 is separated from the one-way bearing 9 due to the motor structure (axial movement under the electromagnetic force of the stator core 6) and rotates freely. When the motor is powered off, the rotor shaft 101 is reset under the action of the spring 2, and the rotor shaft 101 contacts the one-way bearing 9. Since the one-way bearing 9 cannot rotate in the inertial rotation direction of the rotor shaft 101, the one-way bearing 9 can prevent the rotor shaft 101 from continuing to rotate due to inertia, reduce the inertial rotation of the rotor shaft 101, and achieve the effect of rapid stop.

[0036] Similar to the damping element 3, the one-way bearing 9 and the spring 2 are located at both ends of the rotor shaft 101. The one-way bearing 9 and the spring 2 are arranged according to the working characteristics of the motor. In this embodiment, the spring 2 is also located between the cover plate 5 and the cast aluminum rotor 102, and the one-way bearing 9 is located at the other end of the rotor assembly 1, that is, the one-way bearing 9 is placed in the reduction box 4, and one end of the rotor assembly 1 extends into the one-way bearing 9. Since the rotor shaft 101 extends into the reduction box 4, the one-way bearing 9 is preferably placed in the upper cover 401, such as Figure 4and Figure 5 As shown, an installation groove 10 for accommodating the one-way bearing 9 is provided at one end of the upper cover 401 facing the lower cover 402. The one-way bearing 9 is installed in the installation groove 10 by interference fit or bonding.

[0037] In order to prevent the rotor shaft 101 from being unable to disengage and getting stuck in the one-way bearing 9, in a further design, a conical structure 13 is provided at one end of the rotor assembly 1 facing the one-way bearing 9, and the diameter of the conical structure 13 gradually increases from the end facing the one-way bearing 9 to the end away from the one-way bearing 9 (e.g. Figure 5 When the rotor shaft 101 is brought into contact with the one-way bearing 9, the contact area is reduced.

[0038] In the description of the present invention, it is necessary to understand that the terms "left", "right", "inside", "outside", "axial", "radial", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0039] In this specification, the schematic representation of the terms does not necessarily refer to the same embodiment. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in one or more embodiments.

[0040] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A shaded-pole reduction motor with rapid stop upon power failure, characterized in that: It comprises an axially floating rotor assembly (1), a spring (2) and a rotation-blocking component, wherein the spring (2) is sleeved on the rotor assembly (1) and abuts against the rotor assembly (1) along the axial direction, and the rotation-blocking component and the spring (2) are arranged at the same end or both ends of the rotor assembly (1); When the shaded-pole reduction motor is powered on, the spring (2) contracts and the rotor assembly (1) operates in suspension; when the shaded-pole reduction motor is powered off, the rotor assembly (1) returns to an initial position via the spring (2) and the anti-rotation component starts to work, preventing the rotor assembly (1) from rotating.

2. The shaded-pole reduction motor capable of rapid stopping upon power failure according to claim 1, characterized in that: The shaded-pole reduction motor further comprises end covers rotatably connected to both ends of the rotor assembly (1), one of the end covers being a reduction box (4), the other end cover being a cover plate (5), a stator core (6) being fixed between the two end covers, and the spring (2) being abutted between the rotor assembly (1) and the cover plate (5).

3. The shaded-pole reduction motor capable of rapid stopping upon power failure according to claim 1 or 2, characterized in that: The anti-rotation component is a damping element (3) which is arranged on an end surface of the rotor assembly (1) away from the spring (2); when the shaded-pole reduction motor is powered off, the anti-rotation component abuts against the rotor assembly (1) and an end cover of the shaded-pole reduction motor simultaneously.

4. The shaded-pole reduction motor capable of rapid stopping upon power failure according to claim 3 is characterized in that: A plurality of ribs (8) protruding toward the anti-rotation component are provided on an end cover at one end where the anti-rotation component is located. The ribs (8) extend in the radial direction of the rotor assembly (1). When the shaded-pole reduction motor is powered off, the anti-rotation component abuts against the ribs (8).

5. The shaded-pole reduction motor capable of rapid stopping upon power failure according to claim 1 or 2, characterized in that: The anti-rotation component is a one-way bearing (9), the rotor assembly (1) is separated from or in contact with the one-way bearing (9) by axial floating, and the installation direction of the one-way bearing (9) is opposite to the inertial rotation direction of the rotor assembly (1).

6. The shaded-pole reduction motor capable of rapid stopping upon power failure according to claim 5, characterized in that: The one-way bearing (9) is arranged in an end cover at one end of the shaded-pole reduction motor, one end of the rotor assembly (1) extends into the one-way bearing (9), and the spring (2) is located at the other end of the rotor assembly (1).

7. The shaded-pole reduction motor capable of rapid stopping upon power failure according to claim 6, characterized in that: The reduction box (4) of the shaded-pole reduction motor comprises an upper cover (401), a lower cover (402) and a gear set (403); the lower cover (402) is arranged close to the inner side; an end of the upper cover (401) facing the lower cover (402) is provided with a mounting groove (10) for accommodating a one-way bearing (9).

8. The shaded-pole reduction motor capable of rapid stopping upon power failure according to claim 6, characterized in that: A conical structure (13) is provided at one end of the rotor assembly (1) facing the one-way bearing (9), and the diameter of the conical structure (13) gradually increases from the end facing the one-way bearing (9) to the end away from the one-way bearing (9).

9. The shaded-pole reduction motor capable of rapid stopping upon power failure according to claim 1, characterized in that: The rotor assembly (1) comprises an integrally arranged rotor shaft (101) and a cast aluminum rotor (102); the cast aluminum rotor (102) is provided with a rotor slot (11) at one end facing the spring (2); one end of the spring (2) extends into the rotor slot (11) and abuts against the cast aluminum rotor (102).

10. The shaded-pole reduction motor capable of rapid stopping upon power failure according to claim 9, characterized in that: One end of the spring (2) away from the cast aluminum rotor (102) is connected to a gasket (12), and the gasket (12) abuts against an end cover of the shaded-pole reduction motor.

Images