Assembled brushless rotary transformer

Abstract

The utility model provides an assembled brushless rotary transformer, which overcomes the defects of higher structural complexity and higher processing and assembling difficulty of the conventional assembled brushless rotary transformer. Starting from the structure of the assembly type brushless rotary transformer, through the innovative design of the main shell, the rear cover, the screw ring and the assembly form, compared with a redundant structure of a traditional structure, the integrated structure of the main shell and the screw-free rear cover enables the overall structure of the rotary transformer to be simpler and more compact, the size is further reduced, and the structure is more compact. The overall assembly is simpler, the product integration degree is improved, the assembly difficulty and errors of products are greatly reduced, the assembly workload is reduced, the design precision is ensured, the assembly precision is improved, and therefore the product precision is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of assembled brushless rotary transformers, and in particular relates to an assembled brushless rotary transformer. Background Art

[0002] A rotary transformer is an electromagnetic sensor, also known as a synchronous resolver. It is a small AC motor used to measure angles. It is used to measure the angular displacement and angular velocity of the rotating shaft of a rotating object. It consists of a stator and a rotor. The stator winding is the primary side of the transformer and receives the excitation voltage. The rotor winding is the secondary side of the transformer and obtains the induced voltage through electromagnetic coupling. Therefore, the rotary transformer is a device for precise angle, position, and speed detection. It has the characteristics of high sensitivity and strong anti-interference ability. It is particularly suitable for occasions with relatively harsh environmental conditions such as high temperature, severe cold, humidity, high speed, and high vibration.

[0003] As a precision angle, position, and speed detection device, the assembled brushless rotary transformer is widely used in the fields of industry, aerospace, weapons, etc. Therefore, improving detection accuracy and miniaturization are important points for the assembly of brushless rotary transformers. Figure 1 As shown, the current assembled brushless rotary transformer has a high structural complexity, and the processing and assembly of multiple components are difficult. The detection accuracy is seriously affected by the process. These are the problems that need to be improved and enhanced in the assembled brushless rotary transformer.

[0004] Therefore, the research and development team of the utility model believes that it is necessary to design a new assembled brushless rotary transformer housing and back cover structure to facilitate processing and assembly. Summary of the invention

[0005] The purpose of the utility model is to solve the shortcomings of the current assembled brushless rotary transformer, which has high structural complexity and is difficult to process and assemble. An assembled brushless rotary transformer is provided. By optimizing the main housing and the rear cover structure, the size of the assembled brushless rotary transformer is further reduced, the product integration is improved, the assembly difficulty of the product is reduced, and the assembly accuracy is improved, thereby reducing the electrical error of the rotary transformer and improving the product accuracy.

[0006] To achieve the above purpose, the technical solution provided by the utility model is:

[0007] An assembled brushless rotary transformer, which has the following special features: it includes a main housing, a rear cover, a screw ring, a rotating shaft, a stator assembly, a rotor assembly, a retaining ring, an inner connecting wire, an outer connecting wire, a bearing I and a bearing II;

[0008] The front end of the main housing is integrated with the output shaft end of the rotary transformer and its flange surface, and the end surface is coaxially provided with a shaft mounting hole, and the rear end is provided with a rear cover mounting reference; the main housing adopts an integrated design, which can greatly reduce the assembly and debugging of parts and further ensure the coaxiality between the output end of the shaft and the main housing;

[0009] The rear cover is installed at the rear end of the main housing through a spiral ring spinning seal, and a rotating shaft installation position is coaxially arranged on the rear cover;

[0010] The rotating shaft adopts a stepped shaft, and its two ends are coaxially mounted on the main housing and the rear cover through bearings I and II respectively;

[0011] The stator assembly includes a stator subassembly and a transformer outer ring assembly; the transformer outer ring assembly includes a transformer outer ring cover, a transformer outer ring assembly and a transformer outer ring core; the rotor assembly includes a rotor subassembly and a transformer inner ring;

[0012] A stator subassembly installation reference is provided near the front end inside the main housing; the stator subassembly, the transformer outer ring cover plate and the transformer outer ring core are arranged in sequence from the front end to the rear end inside the main housing; the retaining ring is arranged on the inner wall of the main housing between the stator subassembly and the transformer outer ring cover plate for spatial positioning; the transformer outer ring assembly is embedded in the groove formed by the transformer outer ring cover plate and the transformer outer ring core, so as to ensure the distance between the stator subassembly and the transformer outer ring;

[0013] The transformer inner ring and the rotor subassembly are coaxially assembled on the rotating shafts at the corresponding positions of the transformer outer winding group and the stator subassembly, and are limited by the stepped shaft design of the rotating shaft to ensure equal spacing, and the two are electrically connected through internal connecting wires;

[0014] The externally connected wires of the stator subassembly and the transformer outer ring assembly extend out of the main housing through the wire outlet holes arranged on the wall surface of the main housing between the two.

[0015] Furthermore, the shaft mounting holes are stepped mounting holes with increasing apertures from outside to inside, namely, a first stepped hole, a second stepped hole and a third stepped hole; wherein the aperture of the first stepped hole is adapted to the size of the shaft output shaft;

[0016] The bearing I is located in the third step hole.

[0017] Furthermore, the inner cavity of the main shell is a step installation cavity with increasing aperture from the front end to the rear end, which are respectively a first step cavity, a second step cavity and a third step cavity;

[0018] The step surface between the first step cavity and the second step cavity forms a stator subassembly installation reference;

[0019] The step surface between the second step cavity and the third step cavity forms a back cover installation reference;

[0020] An internal thread matching with the screw ring is arranged on the wall surface of the third step cavity.

[0021] Furthermore, the shaft installation position is a groove provided on an end surface of one end of the rear cover, and the bearing II is installed therein;

[0022] An annular notch matching the spiral ring is coaxially arranged on the other end surface of the rear cover;

[0023] The outer peripheral surface of the screw ring is provided with an external thread, and the side is provided with a mounting hole, and the screw ring is rotated and installed through the mounting hole on the side of the screw ring using a wrench or tweezers.

[0024] Furthermore, a plurality of concentric arc grooves are evenly arranged on the front end surface of the main housing, which are used for connecting the product to the outside for installation and debugging of the rotary transformer, thereby improving the installation convenience and compatibility of the product.

[0025] Furthermore, after the screw ring spins the back cover, the thread pair is sealed and bonded by thread glue to ensure the firmness of the rotational structure. The spinning action of the screw ring on the back cover also improves the concentricity of bearings I and II, thereby ensuring the installation coaxiality of the entire shaft and its internal rotor assembly. Furthermore, bearing gaskets are provided between the steps of bearings I and II and the shaft for gap adjustment.

[0026] Furthermore, the stator subassembly, the transformer outer ring cover plate and the transformer outer ring core are all fixed in the main housing by adhesive.

[0027] Furthermore, the external wire is fixed to the outer wall of the main shell through cotton thread after being extended.

[0028] The advantages of the utility model are:

[0029] 1. The utility model starts from the structure of an assembled brushless rotary transformer (referred to as a rotary transformer), and through the innovative design of the main housing, back cover, screw ring and assembly form, compared with the complicated structure of the traditional structure, the integrated main housing and screwless back cover structure make the overall structure of the rotary transformer more streamlined and compact, the volume is further reduced, the overall assembly is simpler, the product integration is improved, the assembly difficulty and error of the product are greatly reduced, the assembly workload is reduced, the design accuracy is guaranteed, the assembly accuracy is improved, and thus the product accuracy is improved.

[0030] 2. The utility model adopts an integrated design of the output shaft end face and the shell (that is, the main shell adopts an integrated design), which, on the one hand, overcomes the traditional separate structure and makes the main shell more compact, reduces the size and improves the integration of the product; on the other hand, it improves the coaxiality of the overall structure in terms of performance, thereby improving the accuracy of the product, and reduces the complexity of the assembly process (that is, the assembly process is streamlined) and the assembly error caused by the assembly process, thereby improving the sensing detection accuracy while reducing the size of the rotary transformer.

[0031] 3. The utility model adopts a screwless back cover, and makes an innovative and simplified design for the back cover at the rear end. The back cover is spun and installed to the rear end of the main shell by means of a screw ring, and is matched and connected with the bearing of the rotating shaft, thereby improving the radial imbalance and axial overturning effect caused by the traditional screw installation, and also improving the coaxiality of the rotating shaft during the overall assembly process, ensuring the assembly accuracy of the rotor assembly and the concentricity of the rotation work, thereby improving the power conversion efficiency between the inner and outer rings of the transformer, the rotor subassembly and the stator subassembly, reducing the heating of the equipment, reducing the voltage fluctuation of the detection output phase of the rotating transformer and the electrical error of the product, and improving the speed, angle and detection accuracy and stability.

[0032] 4. The utility model uses a stepped shaft design to equidistantly space the rotor subassembly and the inner ring of the transformer, and uses a retaining ring to equidistantly space the stator subassembly and the outer ring of the transformer, thereby ensuring that there is no electromagnetic interference between the two components, thereby ensuring the stability of the resolver output voltage.

[0033] 5. The utility model directly utilizes the thread between the screw ring and the main shell body to produce a spinning effect on the installation of the rear cover, and applies thread glue on the thread during assembly, which can ensure the reliability of the thread connection on the one hand, and prevent the thread from loosening on the other hand.

[0034] 6. The structure of the utility model can avoid the increase of electrical errors caused by the non-concentricity of the stator and rotor of the rotary transformer during the assembly process, thereby improving the sensitivity and anti-interference ability of the rotary transformer, making the brushless rotary transformer more suitable for occasions with relatively harsh environmental conditions such as high temperature, severe cold, humidity, high speed, and high vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the structure of the housing and rear cover of the existing assembled rotary transformer;

[0036] Figure 2 This is the assembly structure diagram of the assembled brushless rotary transformer of the utility model;

[0037] Figure 3 This is a schematic diagram of the assembly structure of the rotor subassembly in the assembled brushless rotary transformer of the utility model;

[0038] Figure 4 This is a schematic diagram of the assembly structure of the stator subassembly in the assembled brushless rotary transformer of the utility model;

[0039] Figure 5 This is a schematic diagram of the main housing structure of the assembled brushless rotary transformer of the utility model;

[0040] Figure 6 This is a schematic diagram of the rear cover structure of the assembled brushless rotary transformer of the utility model;

[0041] Figure 7 This is a schematic diagram of the screw ring structure in the assembled brushless rotary transformer of the utility model;

[0042] The figures are as follows:

[0043] 1-main housing, 2-rotor subassembly, 3-stator subassembly, 4-retaining ring, 5-inner connecting wire, 6-transformer outer ring cover, 7-transformer outer ring assembly, 8-transformer outer ring core, 9-back cover, 10-screw ring, 11-transformer inner ring, 12-bearing gasket, 13-rotating shaft, 14-bearing II, 15-external connecting wire, 16-cotton thread, 17-bearing I, 18-rotating shaft mounting hole, 19-rotating shaft mounting position, 20-annular notch. DETAILED DESCRIPTION

[0044] The following is a further detailed description of the present invention in conjunction with the accompanying drawings and specific embodiments:

[0045] The utility model assembles the main components of the rotary transformer through an integrated main housing, and provides better assembly space for components such as the stator and the rotor by designing the inner cavity of the main housing in a boss and a stepped manner.

[0046] like Figure 2-Figure 7 As shown, an assembled brushless rotary transformer includes a main housing, a rear cover, a screw ring, a rotating shaft, a stator assembly, a rotor assembly, a retaining ring, an internal connection wire, an external connection wire, a bearing I and a bearing II. The stator subassembly and other fixed components are bonded inside the main housing to form a stator assembly, and the rotor assembly is assembled as a whole through the bearing embedded in the rear cover. The rear end is matched with the threaded hole of the main housing through the screw ring and fixed and sealed with thread glue. Among them, the stator assembly includes a stator subassembly and a transformer outer ring assembly; the transformer outer ring assembly includes a transformer outer ring cover plate, a transformer outer ring assembly and a transformer outer ring core; the rotor assembly includes a rotor subassembly and a transformer inner ring.

[0047] The main housing assembles the main components of the rotary transformer. The output shaft end of the rotary transformer and its flange surface are integrated at its front end, and a shaft mounting hole is coaxially arranged on the end surface, and the rear end is installed with a rear cover. The inner cavity of the main housing is a step mounting cavity with increasing aperture from the front end to the rear end, which are the first step cavity, the second step cavity and the third step cavity; the step surface between the first step cavity and the second step cavity forms the stator subassembly installation reference; the step surface between the second step cavity and the third step cavity forms the rear cover installation reference; the wall surface of the third step cavity is provided with an internal thread that cooperates with the screw ring. The shaft mounting hole is a step mounting hole with increasing aperture from the outside to the inside, which are the first step hole, the second step hole and the third step hole.

[0048] The rotating shaft adopts a stepped shaft, and its two ends are coaxially assembled on the main housing and the rear cover through bearings I and II respectively; among them, bearing I is assembled on the front end face of the main housing and is located in the third step hole; bearing II is located in the rotating shaft installation position, and the size of the rotating shaft output shaft is adapted to the aperture of the first step hole. Bearing gaskets are arranged between bearings I and II and the steps of the rotating shaft for gap adjustment.

[0049] The transformer assembly includes a transformer outer ring cover, a transformer outer ring group, a transformer outer ring core and a transformer inner ring, wherein the transformer outer ring cover, the transformer outer ring group and the transformer outer ring core together constitute the transformer outer ring assembly.

[0050] The main shell serves as the main support frame (also the installation reference), and the stator subassembly, retaining ring, transformer outer ring cover and transformer outer ring core are fixed in sequence from the front end to the rear end by adhesive; the retaining ring is arranged on the inner wall of the main shell of the stator subassembly and the transformer outer ring cover for equidistant isolation; the transformer outer ring assembly is embedded in the groove formed by the transformer outer ring cover and the transformer outer ring core to form a stator assembly with high concentricity and coaxiality.

[0051] The transformer inner ring and rotor subassembly are coaxially fixed on the rotating shaft at the corresponding positions of the transformer outer ring group and the stator subassembly, and are limited by the stepped shaft design of the rotating shaft to ensure equidistant spacing and consistency of the axis position of the equipment during high-speed rotation. The electrical connection between the two is carried out through internal connecting wires for power transmission.

[0052] The rear cover is installed in the third step cavity at the rear end of the main shell through the spiral ring spinning, which ensures that there is no deflection stress on the shaft during installation and operation; a groove-type shaft installation position is coaxially arranged on one end face, and an annular notch that matches the spiral ring is coaxially arranged on the other end face. The outer peripheral surface of the spiral ring is provided with an external thread, and the side is provided with a mounting hole. The spiral ring is rotated and installed through the mounting hole on the side of the spiral ring using a wrench or tweezers. After the spiral ring spins the rear cover, it is bonded and prevented from loosening by thread glue to ensure the firmness of the rotating structure. The spinning effect of the spiral ring on the rear cover also improves the concentricity of bearings I and II, thereby ensuring the installation coaxiality of the entire shaft and its internal rotor assembly.

[0053] The front end of the main housing is evenly provided with multiple concentric arc grooves for connecting the product to the outside for installation and commissioning of the rotary transformer, thereby improving the installation convenience and compatibility of the product. The external wires of the stator subassembly and the transformer outer winding group are led out through the outlet holes provided on the wall of the main housing between the two, and fixed to the outer wall of the main housing with cotton thread.

[0054] The above description is only a specific implementation mode of the present utility model, but the protection scope of the present utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or substitutions within the technical scope disclosed in the present utility model, and these modifications or substitutions should be included in the protection scope of the present utility model.

Claims

1. An assembled brushless rotary transformer, characterized in that: It includes a main housing, a rear cover, a screw ring, a rotating shaft, a stator assembly, a rotor assembly, a retaining ring, an internal connecting wire, an external connecting wire, a bearing I and a bearing II; The front end of the main housing is integrated with the output shaft end of the rotary transformer and its flange surface, and the end surface is coaxially provided with a shaft mounting hole, and the rear end is provided with a rear cover mounting reference; The rear cover is installed at the rear end of the main housing through a spiral ring spinning seal, and a rotating shaft installation position is coaxially arranged on the rear cover; The rotating shaft adopts a stepped shaft, and its two ends are coaxially mounted on the main housing and the rear cover through bearings I and II respectively; The stator assembly includes a stator subassembly and a transformer outer ring assembly; the transformer outer ring assembly includes a transformer outer ring cover, a transformer outer ring assembly and a transformer outer ring core; the rotor assembly includes a rotor subassembly and a transformer inner ring; A stator subassembly installation reference is arranged near the front end inside the main housing; the stator subassembly, the transformer outer ring cover plate and the transformer outer ring iron core are arranged in sequence from the front end to the rear end inside the main housing; the retaining ring is arranged on the inner wall of the main housing between the stator subassembly and the transformer outer ring cover plate; The transformer outer ring assembly is arranged in a groove formed by the transformer outer ring cover plate and the transformer outer ring iron core; The transformer inner ring and the rotor subassembly are coaxially assembled on the rotating shafts at the corresponding positions of the transformer outer winding group and the stator subassembly, respectively, and are limited by the rotating shaft stepped shaft, and the two are electrically connected by an internal connecting wire; The externally connected wires of the stator subassembly and the transformer outer ring assembly are led out through the lead-out holes arranged on the wall surface of the main shell between the two.

2. The assembled brushless rotary transformer according to claim 1, characterized in that: The shaft mounting holes are stepped mounting holes with increasing apertures from outside to inside, namely, a first stepped hole, a second stepped hole and a third stepped hole; wherein the aperture of the first stepped hole is adapted to the size of the shaft output end; The bearing I is located in the third step hole.

3. The assembled brushless rotary transformer according to claim 1 or 2, characterized in that: The inner cavity of the main shell is a step installation cavity with increasing aperture from the front end to the rear end, which are respectively a first step cavity, a second step cavity and a third step cavity; The step surface between the first step cavity and the second step cavity forms a stator subassembly installation reference; The step surface between the second step cavity and the third step cavity forms a back cover installation reference; An internal thread matching with the screw ring is arranged on the wall surface of the third step cavity.

4. The assembled brushless rotary transformer according to claim 3, characterized in that: The shaft installation position is a groove provided on one end surface of the rear cover, and the bearing II is installed therein; An annular notch matching the spiral ring is coaxially arranged on the other end surface of the rear cover; The outer peripheral surface of the spiral ring is provided with an external thread, and the side surface is provided with a mounting hole.

5. The assembled brushless rotary transformer according to claim 4, characterized in that: A plurality of concentric arc grooves are evenly arranged on the front end surface of the main shell.

6. The assembled brushless rotary transformer according to claim 5, characterized in that: After the screw ring is spun onto the rear cover, the thread pair is sealed and bonded by thread glue.

7. The assembled brushless rotary transformer according to claim 6, characterized in that: Bearing gaskets are arranged between the bearings I and II and the steps of the rotating shaft to adjust the gap.

8. The assembled brushless rotary transformer according to claim 7, characterized in that: The stator subassembly, the transformer outer ring cover plate and the transformer outer ring iron core are all fixed in the main housing by adhesive.

9. The assembled brushless rotary transformer according to claim 8, characterized in that: The externally connected wire is fixed to the outer wall surface of the main shell through cotton thread after being extended out.

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