Rotary transformer with good lead clamping effect

Abstract

The utility model provides a rotary transformer with a good lead clamping effect, which comprises a stator with a hollow annular stator framework, a connector which is connected to the outer wall of the stator framework and horizontally extends outwards, a clamping plate which is clamped on the connector, and a lead which is led out from the connector, the upper surface of the clamping plate is provided with a welding groove exposing a bonding pad and a leading-out groove communicated with the welding groove, the leading-out groove is provided with openings in the upper surface and the end face of the connector, the section of the leading-out groove is U-shaped, the bottom wall of the leading-out groove is a first arc surface, the clamping plate is clamped above the connector, and the lower surface of the clamping plate is provided with a strip-shaped boss protruding downwards. The boss is embedded in the leading-out groove in a vertically movable mode, the bottom face of the boss is the second arc face, and when the clamping plate is clamped on the connector, the first arc face and the second arc face can be utilized to define a channel for leading out the lead and extrude the outer wall of the lead, so that the clamping force on the lead is uniformized, and leakage at the corners of the channel is reduced and eliminated. The clamping effect is good, and the service life is long.

Description

Technical Field

[0001] This utility model relates to the field of rotary transformer technology, specifically to a rotary transformer with good lead wire clamping effect. Background Technology

[0002] The working principle of a rotary transformer is basically similar to that of a conventional transformer. The difference lies in the fact that in a conventional transformer, the primary and secondary windings are relatively fixed, so the ratio of output voltage to input voltage is constant. In a rotary transformer, however, the relative positions of the primary and secondary windings change with the angular displacement of the rotor. Therefore, the magnitude of its output voltage varies with the rotor's angular displacement. The voltage amplitude of the output winding has a sinusoidal or cosine function relationship with the rotor angle, or maintains a certain proportional relationship, or has a linear relationship with the angle within a certain angle range. Rotary transformers can be used to transmit angle or electrical signals in synchronous and digital servo systems; in calculation devices, they can be used for function calculation, hence they are also called solvers.

[0003] To transmit signals, the windings of the rotary transformer are connected with leads. Typically, one end of the lead is soldered to the embedded pad of the connector of the rotary transformer, and the other end extends outward. The connector is also equipped with a retaining plate. Through the cooperation of the retaining plate and the groove on the connector, a rectangular cross-sectional channel for the lead to be led out is formed. When the retaining plate is tightened, the contact part between the channel and the lead is concentrated in the middle of the four sides of the cross-section. The clamping force applied to the lead is not uniform, resulting in poor clamping effect and shortening the service life of the lead. At the same time, the four corners of the channel are in a state of leakage, which makes it easy for foreign objects to flow in and cause short circuits in the lead, posing a potential hazard. Utility Model Content

[0004] The purpose of this invention is to overcome one or more shortcomings in the prior art and provide a rotary transformer with good lead wire clamping effect.

[0005] To achieve the above objectives, the product in the technical solution adopted by this utility model is a rotary transformer with good lead wire clamping effect, comprising:

[0006] A stator, the stator comprising a stator frame in the form of a hollow annulus;

[0007] A connector that is connected to the outer wall of the stator frame and extends horizontally outward;

[0008] A card plate that snaps onto the connector;

[0009] Lead wire, the lead wire being used to connect the stator coil wound on the stator frame, the lead wire being led outward from the connector;

[0010] The connector is plate-shaped. The upper surface of the connector is provided with a soldering groove for exposing the solder pads and a lead-out groove connected to the soldering groove. The lead-out groove has openings on both the upper surface and the end face of the connector. The cross-section of the lead-out groove is U-shaped, and its bottom wall is a first arc surface. The clamping plate is clamped on the top of the connector. The lower surface of the clamping plate is provided with a downward protruding boss. The boss is elongated and can be movably embedded in the lead-out groove. The bottom surface of the boss is a second arc surface. When the clamping plate is clamped on the connector, the first arc surface and the second arc surface form a channel for the lead wire to be led out and squeeze the outer wall of the lead wire.

[0011] Preferably, the radius of the first arc surface and the radius of the second arc surface are equal and equal to half the diameter of the lead wire.

[0012] Preferably, the card plate has downwardly extending extension plates on both sides, and the extension plates are snapped into the side walls of the connector.

[0013] More preferably, the extension plate and the connector have a locking structure, the locking structure including a buckle on the opposite side surface of the extension plate and hooks on both sides of the connector. When locked, the buckle locks the hooks, so that the locking plate is locked onto the connector.

[0014] More preferably, the inverted buckles are multiple and spaced apart.

[0015] More preferably, at least two of the inverted projections in the vertical direction overlap.

[0016] More preferably, there are multiple hooks arranged sequentially in the vertical direction, and the buckle can adjust the tightness between the card plate and the connector by fastening the hooks at different heights.

[0017] Preferably, the radius of the first arc surface and the radius of the second arc surface are greater than one-half of the diameter of the lead wire and less than two-thirds of the diameter of the lead wire.

[0018] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0019] This utility model provides a rotary transformer with good lead wire clamping effect, including a stator with a hollow annular stator frame, a connector connected to the outer wall of the stator frame and extending horizontally outward, a clamping plate clamped on the connector, and leads extending outward from the connector. The connector is plate-shaped, with a welding groove on its upper surface exposing the solder pads and a lead-out groove communicating with the welding groove. By making the lead-out groove open on both the upper surface and end face of the connector, its cross-section is U-shaped, and its bottom wall is a first arc surface. The clamping plate is clamped above the connector. A downward protruding elongated boss is provided on the lower surface of the clamping plate, so that the boss can be movably embedded in the lead-out groove, and the bottom surface of the boss is a second arc surface. When the clamping plate is clamped on the connector, the first and second arc surfaces can be used to form a channel for the lead wire to be led out and squeeze the outer wall of the lead wire, thereby uniformly clamping force on the lead wire and reducing or eliminating leakage at the corners of the channel. It has a good clamping effect, long service life, and can increase the difficulty of foreign flow in, thereby reducing or eliminating potential hazards. Attached Figure Description

[0020] Figure 1 This is a front view schematic diagram of Embodiment 1 of this utility model, with the lead lines hidden.

[0021] Figure 2 yes Figure 1 A three-dimensional schematic diagram.

[0022] Figure 3 yes Figure 1 A 3D diagram with the cardboard panel hidden.

[0023] Figure 4 yes Figure 1 A 3D schematic diagram of the middle card plate.

[0024] Figure 5 yes Figure 1 A schematic diagram showing the assembly and disassembly of the middle stator frame, connectors, and card plate.

[0025] Figure 6 This is a top view of Embodiment 2 of the present invention.

[0026] Figure 7 yes Figure 6 Enlarged cross-sectional view along the AA direction.

[0027] Figure 8 yes Figure 7 A magnified view of a portion of point B in the middle.

[0028] Among them: 1. solder pad; 2. L-shaped metal part; 3. terminal; 10. stator; 11. stator frame; 12. stator core; 20. connector; 21. solder groove; 22. lead-out groove; 221. first arc surface; 23. hook; 30. clamping plate; 31. boss; 311. second arc surface; 32. extension plate; 321. undercut. Detailed Implementation

[0029] Example 1

[0030] like Figures 1 to 5 As shown, the rotary transformer with good lead wire clamping effect provided by this utility model includes: a stator 10, a connector 20, a clamping plate 30, and leads (not shown in the figure). The stator 10 includes a stator frame 11, a stator core 12, and a stator winding (not shown in the figure). The stator frame 11 is a hollow annular shape. The connector 20 is connected to the outer wall of the stator frame 11 and extends horizontally outward. The clamping plate 30 is clamped onto the connector 20. The leads are used to connect the stator coils wound on the stator frame 11, and the leads are led outward from the connector 20. Specifically, the connector 20 is plate-shaped, and its upper surface is provided with a solder groove 21 for exposing the solder pads 1. The welding groove 21 is connected to the lead-out groove 22. The welding groove 21 has an opening on the upper surface of the connector 20. The lead-out groove 22 has openings on both the upper surface and the end face of the connector 20. The cross-section of the lead-out groove 22 is U-shaped, and its bottom wall is a first arc surface 221. The clamping plate 30 is clamped on the top of the connector 20. The lower surface of the clamping plate 30 is provided with a downward protruding boss 31. The boss 31 is long and narrow. The boss 31 is movably embedded in the lead-out groove 22. The bottom surface of the boss 31 is a second arc surface 311. When the clamping plate 30 is clamped on the connector 20, the first arc surface 221 and the second arc surface 311 form a channel for the lead wire to be led out and squeeze the outer wall of the lead wire.

[0031] The advantage of this design is that it can utilize the clamping force of the first and second arc surfaces evenly on the lead wire, and reduce or eliminate the leakage at the corners of the channel, thereby improving the clamping effect of the lead wire and extending its service life. It can also increase the difficulty for foreign objects to flow in from the corners of the channel, reducing or eliminating potential hazards.

[0032] In this embodiment, the radius of the first arc surface 221 and the radius of the second arc surface 311 are equal and equal to half the diameter of the lead wire. This allows the lead wire to be completely wrapped and completely eliminates any gaps around the channel.

[0033] To facilitate snap-fitting, in this embodiment, the two sides of the snap-fit ​​plate 30 are provided with downwardly extending extension plates 32. The extension plates 32 snap-fit ​​onto the two side walls of the connector 20. Specifically, there is a snap-fitting structure between the extension plates 32 and the connector 20. The snap-fitting structure includes a buckle 321 provided on the opposite side surface of the extension plates 32 and a hook 23 provided on both sides of the connector 20. When snap-fitting, the buckle 321 snaps onto the hook 23, so that the snap-fit ​​plate 30 is snapped onto the connector 20.

[0034] In this embodiment, each side of the connector 20 has two hooks 23, which are spaced apart in the front-to-back direction, and the buckle 321 on the extension plate 32 is correspondingly arranged with the hooks 23 on the side of the connector 20.

[0035] It should be noted that the rotary transformer necessarily has a rotor, which is rotatably disposed in the cavity in the middle of the stator frame 11. The solder pad 1 is formed by the horizontal extension of the L-shaped metal part 2 integrally injection molded in the stator frame 11. The vertical extension of the L-shaped metal part 2 protrudes upward from the connector 20 to form the terminal 3 for connecting the stator winding.

[0036] Example 2

[0037] like Figures 6 to 8 As shown, Embodiment 2 is basically the same as Embodiment 1, except that in Embodiment 2, each side wall of the extension plate 32 is provided with two inverted buckles 321 at intervals, and the projections of the two inverted buckles 321 in the vertical direction overlap. At the same time, each side of the connector 20 is provided with multiple hooks 23 arranged sequentially in the vertical direction to form a hook row. These hooks 23 have different heights. By fastening the hooks 23 of different heights, the inverted buckles 321 can adjust the tightness between the clamping plate 30 and the connector 20, thereby adjusting the degree to which the first arc surface 221 and the second arc surface 311 squeeze the outer wall of the lead wire.

[0038] In this embodiment, the radius of the first arc surface 221 and the radius of the second arc surface 311 are greater than one-half and less than two-thirds of the diameter of the lead wire. When squeezed, the deformation of the lead wire sheath can achieve better fit and fill the gaps around the channel.

[0039] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the protection scope of this utility model.

Claims

1. A rotary transformer with good lead wire clamping effect, comprising: A stator, the stator comprising a stator frame in the form of a hollow annulus; A connector that is connected to the outer wall of the stator frame and extends horizontally outward; A card plate that snaps onto the connector; Lead wire, the lead wire being used to connect the stator coil wound on the stator frame, the lead wire being led outward from the connector; Its features are: The connector is plate-shaped. The upper surface of the connector is provided with a soldering groove for exposing the solder pads and a lead-out groove connected to the soldering groove. The lead-out groove has openings on both the upper surface and the end face of the connector. The cross-section of the lead-out groove is U-shaped, and its bottom wall is a first arc surface. The clamping plate is clamped on the top of the connector. The lower surface of the clamping plate is provided with a downward protruding boss. The boss is elongated and can be movably embedded in the lead-out groove. The bottom surface of the boss is a second arc surface. When the clamping plate is clamped on the connector, the first arc surface and the second arc surface form a channel for the lead wire to be led out and squeeze the outer wall of the lead wire.

2. The rotary transformer with good lead wire clamping effect according to claim 1, characterized in that: The radius of the first arc surface and the radius of the second arc surface are equal and equal to half the diameter of the lead wire.

3. The rotary transformer with good lead wire clamping effect according to claim 1, characterized in that: The card plate has downwardly extending extension plates on both sides, which are snapped into the side walls of the connector.

4. The rotary transformer with good lead wire clamping effect according to claim 3, characterized in that: The extension plate and the connector have a locking structure, which includes a buckle on the opposite side surface of the extension plate and hooks on both sides of the connector. When locked, the buckle locks the hooks, so that the locking plate is locked onto the connector.

5. The rotary transformer with good lead wire clamping effect according to claim 4, characterized in that: The inverted buckles are multiple and spaced apart.

6. The rotary transformer with good lead clamping effect according to claim 5, characterized in that: At least two of the inverted projections in the vertical direction overlap.

7. The rotary transformer with good lead wire clamping effect according to claim 4, characterized in that: The hooks are multiple and arranged sequentially in the vertical direction. The buckle can adjust the tightness between the plate and the connector by fastening the hooks at different heights.

8. The rotary transformer with good lead wire clamping effect according to claim 1, characterized in that: The radius of the first arc surface and the radius of the second arc surface are greater than one-half of the diameter of the lead wire and less than two-thirds of the diameter of the lead wire.

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