Rotary transformer and manufacturing method thereof

Abstract

The invention relates to a rotary transformer and a manufacturing method thereof. The rotary transformer comprises a base, a first bearing, a rotor mechanism, a rotating shaft, a second bearing, a stator mechanism and a circuit board, the outer ring of the first bearing abuts against the base. The rotor mechanism abuts against the inner ring of the first bearing. The rotating shaft is fixed with the rotor mechanism; the inner ring of the second bearing sleeves the rotating shaft and is connected with the rotating shaft, the stator mechanism is connected with the base and the outer ring of the second bearing, the stator mechanism and the rotor mechanism are oppositely arranged, the rotor mechanism rotates relative to the stator mechanism, an air gap is formed between the stator mechanism and the rotor mechanism, and the stator mechanism is in signal connection with the rotor mechanism through electromagnetic coupling; the circuit board is fixed to the base, abuts against the outer ring of the second bearing or the face, back to the rotor mechanism, of the stator mechanism, and applies pressure towards the rotor mechanism to the stator mechanism so that the air gap can be kept unchanged. According to the scheme provided by the invention, the air gap can be kept unchanged, the structure is simple, and the cost is low.

Description

Technical Field

[0001] This application relates to the technical field of medical devices, and particularly to a resolver and a manufacturing method thereof. Background Art

[0002] Based on the principle of electromagnetic induction, a resolver transmits the signal of the rotor circuit to the stator circuit. Since there is relative movement between the rotor and the stator, they are separated from each other, and a certain distance, namely the air gap, needs to be maintained between the rotor and the stator. The size of the air gap directly affects the signal transmission loss. The larger the air gap, the more transmission loss, and the smaller the intensity of the received signal. At the same time, during the relative movement between the rotor and the stator, if the size of the air gap is in an unstable state, it will also affect the efficiency and quality of signal transmission. Therefore, obtaining a constant air gap value is the key factor to ensure the signal transmission quality of the resolver.

[0003] Currently, the commonly used air gap adjustment method in the product structure is to adjust by adding or removing gaskets of different thicknesses or a threaded structure. For the gasket adjustment method, since the gaskets need to be repeatedly added and removed, it leads to repeated disassembly and assembly, repeated measurement, long adjustment time, and low efficiency. For the threaded structure adjustment method, since thread loosening prevention measures need to be considered, the structure is complex and the cost is high. Summary of the Invention

[0004] To solve or partially solve the problems existing in the related art, this application provides a resolver and a manufacturing method thereof, which can keep the air gap unchanged, and has a simple structure and low cost.

[0005] In the first aspect of this application, a resolver is provided, which includes a base, a first bearing, a rotor mechanism, a rotating shaft, a second bearing, a stator mechanism, and a circuit board; the outer ring of the first bearing abuts against the base; the rotor mechanism abuts against the inner ring of the first bearing; the rotating shaft is fixed to the rotor mechanism; the inner ring of the second bearing is sleeved outside the rotating shaft and connected to the rotating shaft; the stator mechanism is respectively connected to the base and the outer ring of the second bearing, the stator mechanism is arranged opposite to the rotor mechanism, the rotor mechanism rotates relative to the stator mechanism, an air gap is provided between the stator mechanism and the rotor mechanism, the stator mechanism is signal-connected to the rotor mechanism through electromagnetic coupling; the circuit board is fixed to the base, the circuit board abuts against the outer ring of the second bearing or the side of the stator mechanism facing away from the rotor mechanism, and the circuit board applies a pressure towards the rotor mechanism to the stator mechanism to keep the air gap unchanged.

[0006] Further, the rotor mechanism includes a rotor main body, a rotor core, and a rotor winding circuit. The rotor winding circuit, the rotor core, and the rotor main body are sequentially fixed along the axial direction of the rotating shaft. The rotor main body is fixed to the inner ring of the first bearing.

[0007] The stator mechanism includes a stator main body, a stator core, and a stator winding circuit. The stator winding circuit, the stator core, and the stator main body are sequentially fixed along the axial direction of the rotating shaft. The stator main body is respectively fixed to the base and the outer ring of the second bearing. The stator winding circuit is arranged opposite to the rotor winding circuit, and the stator winding circuit is electrically connected to the circuit board.

[0008] Further, the resolver further includes an adapter plate, and the adapter plate is installed on the rotor main body. The rotor mechanism includes a first extension arm. One end of the first extension arm is connected to the rotor winding circuit, and the other end of the first extension arm passes through the rotor core and is connected to the adapter plate. The rotor winding circuit is electrically connected to the adapter plate through the first extension arm.

[0009] Further, the stator mechanism includes a second extension arm. One end of the second extension arm is connected to the stator winding circuit, and the other end of the second extension arm passes through the stator core and is connected to the circuit board. The stator winding circuit is electrically connected to the circuit board through the second extension arm.

[0010] Further, the resolver further includes a set screw. The set screw is screwed onto the base and abuts against the stator mechanism.

[0011] Further, the stator mechanism is fixed to the base by glue.

[0012] Further, the stator winding circuit and the rotor winding circuit are flexible circuits.

[0013] Further, the resolver further includes fixing bolts. The fixing bolts are screwed onto the circuit board and the base along the axial direction of the rotating shaft.

[0014] Further, the base is provided with a jack, and the jack faces the air gap.

[0015] The second aspect of the present application provides a manufacturing method of a resolver, which includes the following steps:

[0016] S01: Install the first bearing on the base, fix the rotating shaft to the rotor mechanism, and install the rotor mechanism on the base so that the rotor mechanism abuts against the inner ring of the first bearing.

[0017] S02. Place the limit piece on one side of the rotor mechanism. The thickness of the limit piece is the width of the air gap. Insert the stator mechanism axially along the rotation axis into the base, so that the rotation axis passes through the stator mechanism, and the limit piece is clamped between the stator mechanism and the rotor mechanism;

[0018] S03. Press the outer ring of the second bearing axially along the rotation axis on the side of the stator mechanism facing away from the rotor mechanism, and fix the inner ring of the second bearing outside the rotation axis. At this time, the outer ring of the second bearing protrudes from the end face of the base;

[0019] S04. Fix the circuit board on the side of the stator mechanism facing away from the rotor mechanism, then fix the circuit board on the base, press the circuit board on the outer ring of the second bearing, so that the outer ring of the second bearing is subjected to a pressure towards the rotor mechanism;

[0020] S05. Remove the limit piece.

[0021] The technical solution provided by this application may include the following beneficial effects: By pressing the outer ring of the second bearing towards the rotor mechanism through the circuit board, the axial clearance of the first bearing and the second bearing is eliminated, and the resolver can obtain a constant air gap value, with a simple structure, low cost, and high efficiency.

[0022] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit this application. Brief Description of the Drawings

[0023] By describing the exemplary embodiments of this application in more detail in conjunction with the drawings, the above and other objects, features, and advantages of this application will become more obvious. Among them, in the exemplary embodiments of this application, the same reference numerals generally represent the same components.

[0024] Figure 1 is a schematic structural diagram of a resolver shown in an embodiment of this application;

[0025] Figure 2 is a cross-sectional view of a resolver shown in an embodiment of this application;

[0026] Figure 3 is a schematic structural diagram of a rotor mechanism shown in an embodiment of this application;

[0027] Figure 4 is a schematic structural diagram of a stator mechanism shown in an embodiment of this application;

[0028] Figure 5 is a schematic structural diagram of a rotor core shown in an embodiment of this application;

[0029] Figure 6 is a schematic structural diagram of a rotor winding circuit shown in an embodiment of this application;

[0030] Figure 7 It is a schematic structural diagram of the stator core shown in the embodiments of the present application;

[0031] Figure 8 It is a schematic structural diagram of the stator winding circuit shown in the embodiments of the present application.

[0032] Reference numerals: base 1; jack 11; first bearing 2; rotor mechanism 3; mounting hole 31; shaft hole 32; rotor main body 33; first mounting groove 331; rotor core 34; rotor groove 341; rotor winding circuit 35; first extension arm 36; first substrate 37; first extension wire 38; rotating shaft 4; limiting rib 41; second bearing 5; stator mechanism 6; slot 61; stator main body 62; second mounting groove 621; stator core 63; stator groove 631; stator winding circuit 64; second extension arm 65; second substrate 66; second extension wire 67; circuit board 7; connector 8; adapter board 9; air gap 100; set screw 200; fixing bolt 300; limiting piece 400. Detailed implementation manners

[0033] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0034] It should be understood that although the terms "first", "second", "third", etc. may be used in the present application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality of" means two or more unless otherwise specifically defined.

[0035] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application 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 thus should not be construed as a limitation to the present application.

[0036] Unless otherwise clearly defined and limited, the terms "installation", "connection", "linkage", "fixation", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral body; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] In view of the above problems, an embodiment of this application provides a resolver, which can keep the air gap unchanged, and has a simple structure and low cost.

[0038] The technical solutions of the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0039] Figure 1 It is a schematic structural diagram of the resolver shown in the embodiment of this application.

[0040] See Figure 1 , the resolver includes a base 1, a first bearing 2, a rotor mechanism 3, a rotating shaft 4, a second bearing 5, a stator mechanism 6 and a circuit board 7. The base 1 is generally tubular, and the first bearing 2 is located inside the base 1. The outer ring of the first bearing 2 abuts against the base 1. Preferably, the outer ring of the first bearing 2 can be fixed to the base 1 by welding or glue.

[0041] Figure 2 It is a cross-sectional view of the resolver shown in the embodiment of this application.

[0042] See Figure 1-2 , the rotor mechanism 3 passes through the base 1, and the rotor mechanism 3 abuts against the inner ring of the first bearing 2. Preferably, the rotor mechanism 3 can be fixed to the inner ring of the first bearing 2 by welding or glue. An installation hole 31 is provided at one end of the rotor mechanism 3. The resolver further includes a connector 8. One end of the connector 8 is inserted into the installation hole 31, and the connector 8 is fixed to the rotor mechanism 3 by dispensing glue. A shaft hole 32 is provided at the other end of the rotor mechanism 3 relative to the installation hole 31. One end of the rotating shaft 4 is inserted into the shaft hole 32, and the rotating shaft 4 is in interference fit with the shaft hole 32. The rotating shaft 4 and the rotor mechanism 3 are fixed by a plug. The plug is perpendicular to the length direction of the rotating shaft 4, and the plug passes through the rotating shaft 4 and the rotor mechanism 3. The inner ring of the second bearing 5 is sleeved outside the rotating shaft 4 and is connected to the rotating shaft 4. A ring of limit ribs 41 is provided on the outer surface of the rotating shaft 4. The inner ring of the second bearing 5 abuts against the limit ribs 41, and the limit ribs 41 can prevent the inner ring of the second bearing 5 from sliding towards the rotor mechanism 3.

[0043] Figure 4 It is a schematic structural diagram of the stator mechanism shown in the embodiment of this application.

[0044] Refer to Figure 2 and Figure 4 , the stator mechanism 6 is located inside the base 1. The outer side surface of the stator mechanism 6 is fixed to the inner surface of the base 1, and the inner side surface of the stator mechanism 6 is connected to the outer ring of the second bearing 5. A slot 61 is provided on one side of the stator mechanism 6 facing away from the rotor mechanism 3. The outer ring of the second bearing 5 is embedded in the slot 61. When the outer ring of the second bearing 5 moves towards the rotor mechanism 3, the outer ring of the second bearing 5 can push the stator mechanism 6 to move together.

[0045] Refer to Figure 1-2 , the stator mechanism 6 and the rotor mechanism 3 are arranged facing each other. The rotor mechanism 3 rotates relative to the stator mechanism 6. An air gap 100 is provided between the stator mechanism 6 and the rotor mechanism 3. When the resolver works, the rotor mechanism 3 rotates relative to the stator mechanism 6. The rotor mechanism 3 and the stator mechanism 6 cooperate to generate an electromagnetic field. The stator mechanism 6 is signal-connected to the rotor mechanism 3 through electromagnetic coupling in the electromagnetic field. The rotor mechanism 3 can send an electrical signal to the stator mechanism 6, and the stator mechanism 6 then conveys the electrical signal to the circuit board 7.

[0046] Refer to Figure 1-2 , the circuit board 7 is fixed to the base 1. The circuit board 7 abuts against the outer ring of the second bearing 5 or the side of the stator mechanism 6 facing away from the rotor mechanism 3. In this embodiment, the circuit board 7 abuts against the outer ring of the second bearing 5. In other embodiments, the circuit board 7 can abut against the stator mechanism 6. Since problems such as clearance generally occur in bearing products, there are also clearances in the first bearing 2 and the second bearing 5 of the present application. If the influence of the clearances of the first bearing 2 and the second bearing 5 is not considered in the design of the resolver, after the resolver is assembled, when the rotor mechanism 3 works, it will be affected by the axial force, resulting in the axial movement of the rotor mechanism 3 along the rotation axis 4. The axial movement of the rotor mechanism 3 will directly affect the air gap 100 between the rotor mechanism 3 and the stator mechanism 6, causing the size of the air gap 100 to change, thereby affecting the quality of signal transmission and reception between the rotor mechanism 3 and the stator mechanism 6. Therefore, the influence of the clearances of the first bearing 2 and the second bearing 5 can be offset by pre-designing the assembly interference amount. The specific interference amount is determined according to the actual axial clearance values of the first bearing 2 and the second bearing 5. Too large an interference amount will cause serious wear of the first bearing 2 and the second bearing 5, shortening the service life of the first bearing 2 and the second bearing 5, and at the same time will also bring movement noise, while too small an interference amount will not play a good adjustment role. The specific calculation formula is as follows:

[0047] The pre-designed interference amount = A - B = the minimum axial clearance value of the two bearings;

[0048] Where the numerical value B represents the distance between the side of the outer ring of the second bearing 5 facing away from the first bearing 2 and the side of the first bearing 2 facing away from the second bearing 5 after the resolver is assembled; the numerical value A represents the designed distance between the side of the outer ring of the second bearing 5 facing away from the first bearing 2 and the side of the first bearing 2 facing away from the second bearing 5 when the first bearing 2 and the second bearing 5 are assembled first before the circuit board 7 is assembled.

[0049] After the first bearing 2 and the second bearing 5 are assembled and before the circuit board 7 is assembled, the end face of the outer ring of the second bearing 5 needs to protrude from the end face of the base 1. After the circuit board 7 is assembled to the base 1, the circuit board 7 presses the outer ring of the second bearing 5, applying a pressure towards the first bearing 2 to the outer ring of the second bearing 5. The outer ring of the second bearing 5 displaces towards the first bearing 2, and the outer ring of the second bearing 5 also pushes the stator mechanism 6 towards the rotor mechanism 3. The clearance of the first bearing 2 and the clearance of the second bearing 5 will become very small, and the axial movement of the rotor mechanism 3 will be very small, even negligible. When the resolver is working, the air gap 100 can remain unchanged.

[0050] The present invention eliminates the axial clearances of the first bearing 2 and the second bearing 5 by pressing the outer ring of the second bearing 5 towards the rotor mechanism 3 through the circuit board 7, so that the resolver can obtain a constant air gap 100 value, with a simple structure, low cost and high efficiency.

[0051] Figure 3 It is a schematic structural diagram of the rotor mechanism shown in the embodiment of the present application.

[0052] See Figure 2-3 , the rotor mechanism 3 includes a rotor main body 33, a rotor core 34 and a rotor winding circuit 35. The rotor winding circuit 35, the rotor core 34 and the rotor main body 33 are fixedly connected in sequence along the axial direction of the rotating shaft 4, and the rotor main body 33 is fixedly connected to the inner ring of the first bearing 2. The rotor main body 33 is axially provided with a first installation groove 331, the rotor core 34 is embedded in the first installation groove 331, and the rotor core 34 is adhesively bonded to the first installation groove 331 with glue. The rotor winding circuit 35 is installed on the side of the rotor core 34 facing away from the rotor main body 33, and the rotor winding circuit 35 can receive electrical signals or send electrical signals outward.

[0053] See Figure 2 and Figure 4, the stator mechanism 6 includes a stator body 62, a stator core 63, and a stator winding circuit 64. The stator winding circuit 64, the stator core 63, and the stator body 62 are fixedly connected in sequence along the axial direction of the rotating shaft 4. The stator body 62 is fixedly connected to the base 1 and the outer ring of the second bearing 5 respectively. The stator body 62 is located on the side of the rotor core 34 facing away from the rotor main body. In actual work, the rotor main body 33 rotates relative to the stator body 62. The stator core 63 is adhesively bonded to the stator body 62, and the stator core 63 is relatively fixed to the stator body 62. Specifically, the stator body 62 is in the shape of a round cake, and the stator body 62 is provided with a second installation groove 621 in the axial direction. The opening of the second installation groove 621 faces the rotor core 34. The stator core 63 is embedded in the second installation groove 621, and the stator core 63 is adhesively bonded to the second installation groove 621 by glue. The stator winding circuit 64 is installed on the side of the stator core 63 facing the stator winding circuit 64. The stator winding circuit 64 can receive electrical signals and can also send electrical signals outward. The stator winding circuit 64 is spaced from the rotor winding circuit 35. The stator winding circuit 64 and the rotor winding circuit 35 are arranged facing each other, and the stator winding circuit 64 is communicatively connected to the rotor winding circuit 35. The stator winding circuit 64 is electrically connected to the circuit board 7.

[0054] See Figure 2-4 , the rotating shaft 4 sequentially passes through the rotor core 34, the rotor winding circuit 35, the stator winding circuit 64, the stator core 63, and the stator body 62. The rotor core 34 is adhesively bonded to the rotating shaft 4. Among them, the rotor core 34 and the stator core 63 are hollow structures to facilitate the passing of the rotating shaft 4, and the rotating shaft 4 will not drive the stator body 62 to rotate. When the rotating shaft 4 rotates, the rotor main body 33, the rotor core 34, and the rotor winding circuit 35 rotate accordingly, while the stator core 63, the stator winding circuit 64, and the stator body 62 are relatively stationary. When the resolver works, the rotating shaft 4 drives the stator body 62 to rotate. The rotor winding circuit 35 transfers signals to the stator winding circuit 64 by electromagnetic coupling in the electromagnetic field generated by the cooperation of the rotor core 34 and the stator core 63, and the stator winding circuit 64 transfers the signals to the circuit board 7, thereby realizing the separation type signal conversion and transmission.

[0055] See Figure 2 , the resolver further includes an adapter board 9, and the adapter board 9 is adhesively bonded to the rotor main body 33. The rotor mechanism 3 includes a first extension arm 36, a first substrate 37, and a first extension wire 38. One end of the first extension arm 36 is connected to the rotor winding circuit 35, and the other end of the first extension arm 36 passes through the rotor core 34 and is connected to the adapter board 9. The rotor winding circuit 35 is electrically connected to the adapter board 9 through the first extension arm 36. The adapter board 9 can be a PCBA board. Preferably, the adapter board 9 is installed on the side of the rotor main body 33 facing away from the stator body 62.

[0056] Figure 5 It is a schematic structural diagram of a rotor core shown in an embodiment of the present application; Figure 6 It is a schematic structural diagram of a rotor winding circuit shown in an embodiment of the present application.

[0057] See Figure 2 、 Figure 5 and Figure 6 As shown in, the first substrate 37 is made of polyimide or polyester film. The first extension arm 36 and the first substrate 37 are made of insulating materials. The first base is circular ring-shaped, and the rotating shaft 4 passes through the center of the first substrate 37. The rotor core 34 is provided with a first through hole, and the first through hole extends along the axial direction of the rotor core 34. One end of the first extension arm 36 is connected to the first substrate 37, and the other end of the first extension arm 36 passes through the first through hole and is connected to the adapter plate 9. The rotor winding circuit 35 is installed on the first substrate 37. The first winding can be energized, receive signals or send signals. The first extension wire 38 is made of metal, and the first extension wire 38 is located on the first extension arm 36. One end of the first extension wire 38 is electrically connected to the rotor winding circuit 35, and the other end of the first extension wire 38 is electrically connected to the adapter plate 9. Electrical signals can be transmitted between the adapter plate 9, the rotor winding circuit 35, and the first extension wire 38. By providing the adapter plate 9 on the rotor body 33, the rotor winding circuit 35 is connected to the adapter plate 9 through the first extension arm 36. The adapter plate 9 can be communicatively connected to external devices, so as to realize signal transmission between the rotor winding circuit 35 and external devices. Moreover, since the first extension arm 36 passes through the rotor core 34, it avoids the first extension arm 36 occupying the external space of the rotor core 34 and reduces the volume of the resolver.

[0058] Figure 7 It is a schematic structural diagram of a stator core shown in an embodiment of the present application; Figure 8 It is a schematic structural diagram of a stator winding circuit shown in an embodiment of the present application.

[0059] See Figure 2 、 Figure 7 and Figure 8, the stator mechanism 6 includes a second extension arm 65, a second substrate 66, and a second extension wire 67. One end of the second extension arm 65 is connected to the stator winding circuit 64, and the other end of the second extension arm 65 passes through the stator core 63 and is connected to the circuit board 7. The stator winding circuit 64 is electrically connected to the circuit board 7 through the second extension arm 65. The circuit board 7 can be a PCBA board. The second substrate 66 is made of polyimide or polyester film. The second extension arm 65 and the second substrate 66 are made of insulating materials. The second substrate 66 is annular. The rotating shaft 4 passes through the center of the second substrate 66. The stator core 63 is provided with a second through hole that extends along the axial direction of the stator core 63. One end of the second extension arm 65 is connected to the second substrate 66, and the other end of the second extension arm 65 passes through the stator core 63 and is connected to the circuit board 7. The stator winding circuit 64 is installed on the second substrate 66. The stator winding circuit 64 can be powered on, receive signals, or send signals. The second extension wire 67 is made of metal. The second extension wire 67 is located on the second extension arm 65. One end of the second extension wire 67 is electrically connected to the stator winding circuit 64, and the other end of the second extension wire 67 is electrically connected to the circuit board 7. Electrical signals can be transmitted between the circuit board 7, the second winding, and the second extension wire 67. By providing the circuit board 7 on the stator body 62, the stator winding circuit 64 is connected to the circuit board 7 through the second extension arm 65. The circuit board 7 can be communicatively connected to external devices, thereby enabling signal transmission between the stator winding circuit 64 and external devices. Moreover, since the second extension arm 65 passes through the stator core 63, it avoids the second extension arm 65 occupying the external space of the stator core 63 and reduces the volume of the resolver.

[0060] See Figure 2 , Figure 7 and Figure 8 , on the side of the stator core 63 facing the rotor core 34, a stator groove 631 is provided. The stator winding circuit 64 is embedded in the stator groove 631. The outer surface of the stator winding circuit 64 is flush with the side of the stator core 63 facing the rotor core 34. By providing the stator groove 631 to accommodate the stator winding circuit 64, the occupied space of the stator winding circuit 64 is saved. Moreover, the fact that the outer surface of the stator winding circuit 64 is flush with the side of the stator core 63 facing the rotor core 34 helps to adjust the distance between the stator winding circuit 64 and the rotor winding circuit 35. Just by detecting the distance between the stator core 63 and the rotor core 34, the distance between the stator winding circuit 64 and the rotor winding circuit 35 can be known.

[0061] See Figure 2 , Figure 5 and Figure 6, on the side of the rotor core 34 facing the stator core 63, a rotor groove 341 is provided. The rotor winding circuit 35 is embedded in the rotor groove 341, and the outer surface of the rotor winding circuit 35 is flush with the side of the rotor core 34 facing the stator core 63. By providing the rotor groove 341 to accommodate the rotor winding circuit 35, the occupied space of the rotor winding circuit 35 is saved, and the fact that the outer surface of the rotor winding circuit 35 is flush with the side of the rotor core 34 facing the stator core 63 helps to adjust the distance between the rotor winding circuit 35 and the stator winding circuit 64. Just by detecting the distance between the rotor core 34 and the stator core 63, the distance between the stator winding circuit 64 and the rotor winding circuit 35 can be known.

[0062] See Figure 1-2 , in some embodiments, the resolver further includes a set screw 200. The set screw 200 is screwed onto the base 1, the extending direction of the set screw 200 is perpendicular to the axial direction of the rotating shaft 4, and one end of the set screw 200 passes through the base 1 and abuts against the stator mechanism 6. After the circuit board 7 presses the stator body 62 and the outer ring of the second bearing 5 to the appropriate positions, the stator body 62 can be clamped from the side of the stator body 62 by rotating the set screw 200, so that the stator body 62 is fixed relative to the base 1, thereby ensuring that the air gap 100 remains unchanged.

[0063] In some embodiments, after the circuit board 7 presses the stator body 62 and the outer ring of the second bearing 5 to the appropriate positions, glue can be applied to the contact portion between the stator body 62 and the base 1. The stator mechanism 6 is fixed to the base 1 by the glue, so that the stator body 62 is fixed relative to the base 1, thereby ensuring that the air gap 100 remains unchanged.

[0064] See Figure 1-2 , the stator winding circuit 64 and the rotor winding circuit 35 are flexible circuits. Since the stator winding circuit 64 and the rotor winding circuit 35 are flexible circuits, compared with the traditional cable-type windings, the losses and costs can be effectively reduced, and it is also convenient to install the rotor winding circuit 35 onto the rotor core 34 and install the stator winding circuit 64 onto the stator core 63. The resolver further includes a fixing bolt 300. The fixing bolt 300 is screwed onto the circuit board 7 and the base 1 along the axial direction of the rotating shaft 4. While ensuring that the circuit board 7 and the base 1 are firmly fixed, the fixing bolt 300 can also apply a pressure towards the first bearing 2 to the outer ring of the second bearing 5, ensuring that the clearance between the first bearing 2 and the second bearing 5 is at a relatively small and negligible level.

[0065] See Figure 1-2, the base 1 is provided with a jack 11, and the jack 11 faces the air gap 100. In order to facilitate controlling the air gap 100 between the stator mechanism 6 and the rotor mechanism 3 at a target level, during the actual production process of the resolver, a spacer 400 with the required width of the air gap 100 can be placed between the stator mechanism 6 and the rotor mechanism 3. After assembling the circuit board 7 to the base 1, the spacer 400 is then removed. In addition, the jack 11 can also facilitate external inspection equipment to detect the size of the air gap 100.

[0066] Corresponding to the foregoing application function implementation device embodiments, the present application also provides a manufacturing method of a resolver and corresponding embodiments.

[0067] See Figure 1-2, the manufacturing method of the resolver includes the following steps: S01. Install the first bearing 2 on the base 1, fix the rotating shaft 4 to the rotor mechanism 3, press the rotor body 33 into the base 1, and make the rotor mechanism 3 abut against the inner ring of the first bearing 2. S02. Pass the limiting piece 400 through the jack 11 and insert it into the base 1, and place the limiting piece 400 on one side of the rotor winding circuit 35. The thickness of the limiting piece 400 is the width of the air gap 100. Insert the stator mechanism 6 axially along the rotating shaft 4 into the base 1, and make the rotating shaft 4 pass through the stator mechanism 6. The surface of the stator core 63 facing away from the rotor mechanism 3 is flush with the end face of the base 1, where the limiting piece 400 is clamped between the stator mechanism 6 and the rotor mechanism 3. S03. Press the second bearing 5 into the base 1, make the outer ring of the second bearing 5 press against the surface of the stator mechanism 6 facing away from the rotor mechanism 3 axially along the rotating shaft 4, and make the inner ring of the second bearing 5 sleeved outside the rotating shaft 4 to fix the second bearing 5 relative to the rotating shaft 4. At this time, the outer ring of the second bearing 5 protrudes from the end face of the base 1; S04. Fix the circuit board 7 to the surface of the stator mechanism 6 facing away from the rotor mechanism 3 through a pin, and then fix the circuit board 7 on the base 1 through a fixing screw. Press the circuit board 7 on the outer ring of the second bearing 5, so that the outer ring of the second bearing 5 is subjected to a pressure towards the rotor mechanism 3. Since in step S03, the outer ring of the second bearing 5 protrudes from the end face of the base 1, the distance that the outer ring of the second bearing 5 protrudes from the end face of the base 1 is equal to the minimum value of the axial clearance of the first bearing 2 and the second bearing 5. By pressing the circuit board 7 on the outer ring of the second bearing 5, the outer ring of the second bearing 5 displaces towards the rotor mechanism 3, and the axial end play of the rotor mechanism 3 will be very small; In order to ensure that the value of the air gap 100 remains stable, three axes extended by a three-axis tooling can also pass through the circuit board 7 and press the stator mechanism 6 to move axially along the rotating shaft 4 until the limiting piece 400 is pressed tightly. Then, use two set screws 200 to position and fix the stator mechanism 6. After removing the three-axis tooling and the limiting piece 400, after confirming that the value of the air gap 100 meets the requirements, perform spot gluing at the holes where the pins of the stator mechanism 6 cooperate with the circuit board 7 for permanent fixation to prevent the loosening of the set screws 200 caused by movement and vibration from causing a change in the value of the air gap 100, and weld and communicate the second extension line 67 with the corresponding pads of the circuit board 7. S05. Remove the limiting piece 400.

[0068] In the present invention, the outer ring of the second bearing 5 is pressed tightly towards the rotor mechanism 3 by the circuit board 7, so that the stator mechanism 6 approaches the rotor mechanism 3 until the target air gap 100 is obtained, eliminating the axial clearance of the first bearing 2 and the second bearing 5. Then, the stator mechanism 6 is pre-fixed by the set screws 200, and then spot gluing is performed at the connection between the stator mechanism 6 and the base 1 for permanent positioning and fixation, ensuring that the air gap 100 of the resolver is in a relatively stable state, improving the reliability of signal conversion and transmission, and reducing signal transmission loss. The air gap 100 is adjusted in place at one time, with simple operation, low cost, and high efficiency.

[0069] The solutions of the present application have been described in detail above with reference to the accompanying drawings. In the above embodiments, the descriptions of the various embodiments have their own emphases. For the parts not described in detail in a certain embodiment, reference may be made to the relevant descriptions of other embodiments. Those skilled in the art should also be aware that the actions and modules involved in the specification are not necessarily essential to the present application. In addition, it can be understood that the steps in the method embodiments of the present application can be adjusted, combined, and deleted according to actual needs, and the modules in the device embodiments of the present application can be combined, divided, and deleted according to actual needs.

[0070] The various embodiments of the present application have been described above. The above description is exemplary and not exhaustive, and is also not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments. The choice of terms used herein is intended to best explain the principles of the embodiments, the practical application, or the improvement of the technology in the market, or to enable other ordinary skill in the art in the technical field to understand the embodiments disclosed herein.

Claims

1. A resolver, characterized in that, Comprising: Base; First bearing, the outer ring of the first bearing abuts against the base; Rotor mechanism, the rotor mechanism abuts against the inner ring of the first bearing; Rotating shaft, the rotating shaft is fixed to the rotor mechanism; Second bearing, the inner ring of the second bearing is sleeved outside the rotating shaft and connected to the rotating shaft; Stator mechanism, the stator mechanism is respectively connected to the base and the outer ring of the second bearing, the stator mechanism is arranged facing the rotor mechanism, the rotor mechanism rotates relative to the stator mechanism, an air gap is provided between the stator mechanism and the rotor mechanism, and the stator mechanism is signal-connected to the rotor mechanism through electromagnetic coupling; Circuit board, the circuit board is fixed to the base, the circuit board abuts against the outer ring of the second bearing or the side of the stator mechanism facing away from the rotor mechanism, and the circuit board applies a pressure towards the rotor mechanism to the stator mechanism to keep the air gap unchanged.

2. The resolver according to claim 1, wherein: The rotor mechanism includes a rotor body, a rotor core and a rotor winding circuit, the rotor winding circuit, the rotor core and the rotor body are sequentially fixed along the axial direction of the rotating shaft, and the rotor body is fixed to the inner ring of the first bearing; The stator mechanism includes a stator body, a stator core and a stator winding circuit, the stator winding circuit, the stator core and the stator body are sequentially fixed along the axial direction of the rotating shaft, the stator body is respectively fixed to the base and the outer ring of the second bearing, the stator winding circuit is arranged facing the rotor winding circuit, and the stator winding circuit is electrically connected to the circuit board.

3. The resolver according to claim 2, characterized in that: It further includes an adapter board, the adapter board is installed on the rotor body; the rotor mechanism includes a first extension arm, one end of the first extension arm is connected to the rotor winding circuit, the other end of the first extension arm passes through the rotor core and is connected to the adapter board, and the rotor winding circuit is electrically connected to the adapter board through the first extension arm.

4. The resolver according to claim 2, wherein: The stator mechanism includes a second extension arm, one end of the second extension arm is connected to the stator winding circuit, the other end of the second extension arm passes through the stator core and is connected to the circuit board, and the stator winding circuit is electrically connected to the circuit board through the second extension arm.

5. The resolver according to claim 1, characterized in that: It further includes a set screw, the set screw is screwed onto the base, and the set screw abuts against the stator mechanism.

6. The resolver according to claim 1, characterized in that: The stator mechanism is fixed to the base by glue.

7. The resolver according to claim 1, wherein: The stator winding circuit and the rotor winding circuit are flexible circuits.

8. The resolver according to claim 1, wherein: It further includes a fixing bolt, the fixing bolt is screwed onto the circuit board and the base along the axial direction of the rotating shaft.

9. The resolver according to claim 1, wherein: The base is provided with a jack, and the jack faces the air gap.

10. A manufacturing method of the resolver according to any one of claims 1-9, characterized in that, Including the following steps: S01. Install the first bearing on the base, fix the rotating shaft to the rotor mechanism, install the rotor mechanism on the base, and make the rotor mechanism abut against the inner ring of the first bearing; S02. Pad a limiting piece on one side of the rotor mechanism, the thickness of the limiting piece is the width of the air gap, insert the stator mechanism into the base along the axial direction of the rotating shaft, make the rotating shaft pass through the stator mechanism, and the limiting piece is clamped between the stator mechanism and the rotor mechanism; S03. Press the outer ring of the second bearing against the side of the stator mechanism facing away from the rotor mechanism along the axial direction of the rotating shaft, and fix the inner ring of the second bearing outside the rotating shaft. At this time, the outer ring of the second bearing protrudes from the end face of the base; S04. Fix the circuit board to the side of the stator mechanism facing away from the rotor mechanism, then fix the circuit board to the base, press the circuit board against the outer ring of the second bearing, so that the outer ring of the second bearing is subjected to a pressure towards the rotor mechanism; S05. Remove the limit piece.

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