Motor speed sensor mounting mechanism

Abstract

The utility model discloses a motor speed sensor mounting mechanism, including first magnetic ring seat, second magnetic ring seat and speed sensor magnetic ring, first magnetic ring seat includes first annular main part, and the one end of first annular main part's outside wall is equipped with the locating post near speed sensor magnetic ring, and speed sensor magnetic ring deviates the center and is equipped with the locating hole, and the outside wall of first annular main part is equipped with first limiting portion, and first annular main part is with the interference fit of pivot, and first limiting portion is pressed in one side of speed sensor magnetic ring, the locating post is inserted in the locating hole, second magnetic ring seat includes second annular main part, and the outside wall of second annular main part is equipped with second limiting portion, and second annular main part is with the interference fit of pivot, and second limiting portion is pressed in the other side of speed sensor magnetic ring, to with second limiting portion common clamping speed sensor magnetic ring, the utility model discloses have the advantages of convenient assembling, save labor, clamping firm and reliable, guarantee the stable of motor operation and the advantage of prolonging the service life of motor.

Description

Technical Field

[0001] This utility model relates to an electric motor, and more particularly to an electric motor speed sensor mounting mechanism. Background Technology

[0002] To ensure stable output speed and achieve multiple controllable speeds, series-wound motors use hall sensors in conjunction with magnetic rings of the same pole number to detect motor speed. Traditionally, the magnetic ring is fixed to a ring holder, but this requires adhesive. Specifically, a layer of adhesive is applied to the ring holder, and the magnetic ring is then attached to the adhesive side of the holder. After the adhesive dries, the magnetic ring is fixed to the holder, and then the entire holder is installed onto the motor shaft. However, this method of fixing the magnetic ring requires pre-fabrication before assembly, which is inconvenient and increases labor costs. Furthermore, the adhesive, under the influence of hot and cold temperatures, ages and loosens over time, resulting in weak adhesion and affecting the stability and lifespan of the motor. Utility Model Content

[0003] The purpose of this utility model is to provide a device that is easy to assemble, saves labor, has a firm and reliable clamping mechanism, ensures stable motor operation, and extends service life.

[0004] To achieve the above objectives, this utility model provides a motor speed sensor mounting mechanism, disposed on the rotating shaft of a motor, including a first magnetic ring seat, a second magnetic ring seat, and a speed sensor magnetic ring. The first magnetic ring seat, the speed sensor magnetic ring, and the second magnetic ring seat are respectively disposed on the rotating shaft. The first magnetic ring seat includes a first annular body, with a positioning post at one end of the outer wall of the first annular body near the speed sensor magnetic ring. The speed sensor magnetic ring has a positioning hole at an off-center location. The outer wall of the first annular body has a first limiting portion. The first annular body is interference-fitted with the rotating shaft, and the first limiting portion abuts against one side of the speed sensor magnetic ring. The positioning post is inserted into the positioning hole. The second magnetic ring seat includes a second annular body, with a second limiting portion on the outer wall of the second annular body. The second annular body is interference-fitted with the rotating shaft, and the second limiting portion abuts against the other side of the speed sensor magnetic ring, so as to clamp the speed sensor magnetic ring together with the second limiting portion.

[0005] Compared with existing technologies, this invention provides a first magnetic ring seat and a second magnetic ring seat, with a first limiting part and a positioning post on the first magnetic ring seat and a second limiting part on the second magnetic ring seat. A positioning hole is provided on the speed sensor magnetic ring. The first and second magnetic ring seats are interference-fitted with the rotating shaft, and the first and second limiting parts clamp the speed sensor magnetic ring, thereby axially positioning the speed sensor magnetic ring. Simultaneously, the positioning post, inserted into the positioning hole, allows for circumferential positioning of the speed sensor magnetic ring. Therefore, the speed sensor magnetic ring can be completely fixed, securely and reliably clamped, ensuring stable motor operation and extending the motor's service life. Furthermore, this structure makes motor assembly very simple and convenient, saving labor.

[0006] Preferably, the speed sensor magnetic ring has a central hole; the first annular body is fitted into the central hole. This allows the speed sensor magnetic ring and the first magnetic ring seat to remain substantially coaxial, which facilitates rapid positioning of the speed sensor magnetic ring during assembly and makes the speed sensor magnetic ring more securely and stably installed.

[0007] Preferably, the first annular body has a first through hole at its center, and the second annular body has a second through hole at its center, with the first through hole and the second through hole respectively having an interference fit with the rotating shaft.

[0008] Preferably, the first limiting portion has a first limiting surface on the side facing the speed sensor magnetic ring, and the first limiting surface abuts against one side of the speed sensor; the second limiting portion has a second limiting surface on the other side facing the speed sensor magnetic ring, and the second limiting surface abuts against the other side of the speed sensor. By using the first limiting surface and the second limiting surface to clamp and position the speed sensor, the frictional resistance to the speed sensor magnetic ring can be increased, thereby making the first magnetic ring seat and the second magnetic ring seat more firmly and reliably clamped.

[0009] Preferably, the first limiting portion is arranged in a ring structure around the first annular body; the second limiting portion is arranged in a ring structure around the second annular body.

[0010] Preferably, the first annular body, the first limiting part, and the positioning post are integrally formed. Attached Figure Description

[0011] Figure 1 This is a three-dimensional top view of the magnetic ring mounting mechanism for the motor speed sensor of this utility model.

[0012] Figure 2 This is a three-dimensional bottom view of the magnetic ring mounting mechanism for the motor speed sensor of this utility model.

[0013] Figure 3 This is an exploded view of the magnetic ring mounting mechanism for the motor speed sensor of this utility model.

[0014] Figure 4 This is a structural diagram showing the first magnetic ring seat and the speed sensor magnetic ring cooperating in the motor speed sensor magnetic ring mounting mechanism of this utility model.

[0015] Figure 5 This is a perspective view of the first magnetic ring seat of the magnetic ring mounting mechanism for the motor speed sensor of this utility model. Detailed Implementation

[0016] To explain in detail the technical content, structural features, objectives and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0017] Please see Figures 1 to 4 The motor speed sensor mounting mechanism 100 of this utility model is disposed on the rotating shaft 200 of a motor and includes a first magnetic ring seat 1, a second magnetic ring seat 2, and a speed sensor magnetic ring 3. The first magnetic ring seat 1, the speed sensor magnetic ring 3, and the second magnetic ring seat 2 are respectively disposed on the rotating shaft 200; the first magnetic ring seat 1 and the second magnetic ring seat 2 together clamp the speed sensor magnetic ring 3. The first magnetic ring seat 1 includes a first annular body 11, and a positioning post 12 is provided at one end of the outer wall of the first annular body 11 near the speed sensor magnetic ring 3. The positioning posts 12 are respectively arranged on opposite sides of the first annular body 11. In this embodiment, the positioning post 12 is close to the side wall of the first annular body 11, and the cross-section of the positioning post 12 is cylindrical or arc-shaped. The speed sensor magnetic ring 3 is symmetrically provided with positioning holes 31 off-center, and the positioning holes 31 correspond one-to-one with the positioning posts 12. The first annular body 11 has a first limiting part 13 on its outer side wall. The first annular body 11, the first limiting part 13, and the positioning post 12 are integrally formed. The first annular body 11 is interference-fitted with the rotating shaft 200, and the first limiting part 13 presses against one side of the speed sensor magnetic ring 3. The positioning post 12 is inserted into the positioning hole 31. The second magnetic ring seat 2 includes a second annular body 21. The outer side wall of the second annular body 21 is provided with a second limiting part 22. The second annular body 21 is interference-fitted with the rotating shaft 200, and the second limiting part 22 presses against the other side of the speed sensor magnetic ring 3 to clamp the speed sensor magnetic ring 3 together with the second limiting part 22.

[0018] Please see again Figures 3 to 5The speed sensor magnetic ring 3 has a central hole 32. When the positioning post 12 is close to the outer wall of the first annular body 11, and the cross-section of the positioning post 12 is arc-shaped, the positioning hole 31 communicates with the central hole 32, and the cross-section of the positioning hole 31 is also arc-shaped to match the positioning post 12. The diameter of the central hole 32 is slightly larger than the diameter of the first annular body 11, and the first annular body 11 is fitted inside the central hole 32. The first annular body 11 and the central hole 32 have a transition fit, and the positioning post 12 and the positioning hole 31 have a transition fit. This allows the speed sensor magnetic ring 3 and the first magnetic ring seat 1 to remain basically coaxial, which is beneficial for quick positioning of the speed sensor magnetic ring 3 during assembly, and at the same time makes the speed sensor magnetic ring 3 more firmly and stably installed.

[0019] Please see again Figures 2 to 5 The first annular body 11 has a first through hole 14 at its center, and the second annular body 21 has a second through hole 23 at its center. The first through hole 14 and the second through hole 23 are respectively press-fitted with the rotating shaft 200. The first limiting part 13 is arranged circumferentially around the first annular body 11 to form an annular structure; the second limiting part 22 is arranged circumferentially around the second annular body 21 to form an annular structure. The diameters of the first limiting part 13 and the second limiting part 22 are larger than the diameter of the central hole 32 of the speed sensor magnetic ring 3 and smaller than the outer diameter of the speed sensor magnetic ring 3. The first limiting part 13 has a first limiting surface 131 on one side facing the speed sensor magnetic ring 3, and the first limiting surface 131 abuts against one side of the speed sensor. The second limiting part 22 has a second limiting surface 221 on the other side facing the speed sensor magnetic ring 3, and the second limiting surface 221 abuts against the other side of the speed sensor. By using the first limiting surface 131 and the second limiting surface 221 to clamp and position the speed sensor, the frictional resistance to the speed sensor magnetic ring 3 can be increased, thereby making the first magnetic ring seat 1 and the second magnetic ring seat 2 clamped more firmly and reliably.

[0020] Furthermore, the first limiting portion 13 of the first magnetic ring seat 1 of this invention has a limiting plane on the side facing away from the first annular body 11. This allows another first magnetic ring seat 1 to replace the second magnetic ring seat 2, in which case the limiting plane of the other first magnetic ring seat 1 can serve as the second limiting surface 221 of the second magnetic ring seat 2. That is, the structure of the second magnetic ring seat 2 is completely identical to that of the first magnetic ring seat 1. This effectively reduces production costs.

[0021] Compared with the prior art, this utility model sets up a first magnetic ring seat 1 and a second magnetic ring seat 2, with a first limiting part 13 and a positioning post 12 on the first magnetic ring seat 1, and a second limiting part 22 on the second magnetic ring seat. A positioning hole 31 is provided on the speed sensor magnetic ring 3. The first magnetic ring seat 1 and the second magnetic ring seat 2 are interference-fitted with the rotating shaft 200, thereby using the first limiting part 13 and the second limiting part 22 to clamp the speed sensor magnetic ring 3, thus achieving axial positioning of the speed sensor magnetic ring 3. Simultaneously, the positioning post 12 is inserted into the positioning hole 31, thereby achieving circumferential positioning of the speed sensor magnetic ring 3. Therefore, the speed sensor magnetic ring 3 can be completely fixed, and the clamping of the speed sensor magnetic ring 3 is firm and reliable, ensuring stable motor operation and extending the motor's service life. Furthermore, this structure makes motor assembly very simple and convenient, saving labor.

[0022] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A motor speed sensor mounting mechanism, disposed on the rotating shaft of a motor, characterized in that: The device includes a first magnetic ring seat, a second magnetic ring seat, and a speed sensor magnetic ring. The first magnetic ring seat, the speed sensor magnetic ring, and the second magnetic ring seat are respectively disposed on the rotating shaft. The first magnetic ring seat includes a first annular body. A positioning post is provided on the outer side wall of the first annular body near one end of the speed sensor magnetic ring. A positioning hole is provided on the speed sensor magnetic ring off-center. A first limiting portion is provided on the outer side wall of the first annular body. The first annular body is interference-fitted with the rotating shaft, and the first limiting portion abuts against one side of the speed sensor magnetic ring. The positioning post is inserted into the positioning hole. The second magnetic ring seat includes a second annular body. A second limiting portion is provided on the outer side wall of the second annular body. The second annular body is interference-fitted with the rotating shaft, and the second limiting portion abuts against the other side of the speed sensor magnetic ring, so as to clamp the speed sensor magnetic ring together with the second limiting portion.

2. The motor speed sensor mounting mechanism according to claim 1, characterized in that: The speed sensor magnetic ring has a central hole; the first annular body is fitted inside the central hole.

3. The motor speed sensor mounting mechanism according to claim 1, characterized in that: The first annular body has a first through hole at its center, and the second annular body has a second through hole at its center. The first through hole and the second through hole are respectively interference-fitted with the rotating shaft.

4. The motor speed sensor mounting mechanism according to claim 1, characterized in that: The first limiting part has a first limiting surface on the side facing the speed sensor magnetic ring, and the first limiting surface abuts against one side of the speed sensor; the second limiting part has a second limiting surface on the other side facing the speed sensor magnetic ring, and the second limiting surface abuts against the other side of the speed sensor.

5. The motor speed sensor mounting mechanism according to claim 1, characterized in that: The first limiting part is arranged in a ring structure around the first annular body; the second limiting part is arranged in a ring structure around the second annular body.

6. The motor speed sensor mounting mechanism according to claim 1, characterized in that: The first annular body, the first limiting part, and the positioning post are integrally formed.

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