Connection structure, stator, motor, and terminal

Abstract

The disclosed connection structure is a connection structure for a conductor (9) connected to a terminal (20), and includes a hole (26) and a connecting portion (25). The hole (26) is formed in the plate-shaped terminal body (30) constituting the terminal (20). The conductor (9) passes through the hole (26). The connecting portion (25) is formed by folding the terminal body (30) back at a position that crosses the hole (26). The conductor (9) is held in the connecting portion (25).

Description

Technical Field

[0001] This invention relates to a connection structure for conductors connected to terminals, a stator, a motor, and terminals. Background Technology

[0002] In stators of motors, rotary transformers, etc., a connection structure is known in which a hook-shaped holding part (hook) is formed on the terminal, and the end of the conductor (winding) is held inside the holding part, thereby connecting the terminal to the conductor. The holding part is, for example, formed into a shape obtained by circumferentially bending a flat guide body arranged parallel to the conductor. As a result, the conductor can be easily moved along its extension direction inside the holding part, and the connection position of the conductor relative to the terminal can be adjusted (see Patent Document 1).

[0003] Prior technology literature

[0004] [Patent Documents]

[0005] Patent Document 1: Japanese Patent Application Publication No. 2022-108590 Summary of the Invention

[0006] [The problem the invention aims to solve]

[0007] In the aforementioned connection structure, when an external force perpendicular to the conductor's extension acts on the conductor, there is a risk that the conductor may move outward from the gripping part and disengage from the gripping state. This risk can be eliminated, for example, by pre-welding the conductor and the gripping part together. However, during welding, a fixing clamp is sometimes required to prevent the conductor and the gripping part from shifting position. Furthermore, when a terminal has multiple gripping parts, welding operations are required in each gripping part, increasing the number of fixing clamps needed. Thus, the conventional structure for connecting terminals and conductors has room for improvement in terms of ease of operation and efficiency. It should be noted that such problems are not limited to terminals mounted on the stator but may arise in various types of terminals.

[0008] One objective of this application is to provide a connection structure, stator, motor, and terminal that addresses the issues described above, thereby improving ease of operation and work efficiency. Furthermore, the application also aims to achieve effects derived from the structures described in the "Detailed Embodiments" section below, effects that cannot be obtained through conventional techniques.

[0009] [Solution to the problem]

[0010] The disclosed connection structure, stator, motor, and terminals can be implemented as the following disclosed solutions (applicable examples), and solve at least some of the aforementioned problems. Solutions 1-3 correspond to the connection structure, solution 4 corresponds to the stator, solution 5 corresponds to the motor, and solution 6 corresponds to the terminals. Solutions 2-3 are solutions that can be appropriately selected additionally from the connection structure involved in solution 1. Solutions 2-3 are solutions in which any party can be omitted. Solutions 2-3 are not disclosed solutions or structures that are necessary or indispensable for this application.

[0011] Option 1. The disclosed connection structure is a connection structure for a conductor connected to a terminal, and includes a hole and a connecting portion. The hole is formed in a plate-shaped terminal body constituting the terminal, and allows the conductor to pass through. The connecting portion is formed by folding the terminal body back at a position passing through the hole, and clamps the conductor.

[0012] Option 2. Regarding the option including Option 1 above, preferably, the conductor is composed of multiple wires, the width of the hole has a size corresponding to the total diameter of the number of wires, and the height of the hole has a size corresponding to the diameter of one wire.

[0013] Option 3. Regarding the option including Option 2 above, preferably, the connection structure has two shoulder strap portions formed on the terminal body and adjacent to the hole portion in the direction of the extension of the fold line of the terminal body, and the two shoulder strap portions have the same conductor cross-sectional area.

[0014] Option 4. The disclosed stator is a stator with a connection structure applicable to any one of Options 1 to 3 above. The stator includes: a retaining member that retains the terminal connected to the winding of the stator; and a base member that supports the retaining member.

[0015] Option 5. The disclosed motor has a stator as described in Option 4 above; and a rotor arranged radially opposite to the stator.

[0016] Option 6. The disclosed terminal comprises a plate-shaped terminal body, a hole, and a connecting portion. The hole is formed in the terminal body. A conductor passes through the hole. The connecting portion is formed by folding the terminal body back at a position transverse to the hole. The conductor is held in the connecting portion.

[0017] [Invention Effects]

[0018] Based on the disclosed connection structure, stator, motor, and terminals, the conductor is less likely to detach from the connection part, thus improving the ease of operation and efficiency of the connection between the conductor and the terminal. Attached Figure Description

[0019] Figure 1 It is an exploded perspective view of the motor including the connection structure involved in the embodiment.

[0020] Figure 2 It is a three-dimensional view obtained by enlarging the main parts of the terminal and retaining components.

[0021] Figure 3 This is a top view of the terminals and retaining components.

[0022] Figure 4 (A) to (D) are three-dimensional views obtained by enlarging the main part of the terminal. Figure 4 (A) indicates the terminal (terminal body) before completion. Figure 4 (B) indicates the completed terminal. Figure 4 (C) indicates the terminal connected to the lead wire. Figure 4 (D) indicates a terminal as a variation.

[0023] Figure 5 (A) and (B) are cross-sectional views of the retaining member holding the terminal.

[0024] Figure 6 It is a sectional view used to illustrate the track structure (the relationship between the concave and convex parts).

[0025] Figure 7 It is a three-dimensional diagram used to illustrate the track structure as a variation. Detailed Implementation

[0026] The connection structure, stator, motor, and terminals of each embodiment are described with reference to the accompanying drawings. The embodiments shown below are merely illustrative and are not intended to exclude the application of various modifications and techniques not explicitly shown in these embodiments. The structures of this embodiment can be implemented in various modifications without departing from its spirit. Furthermore, the structures of this embodiment can be selected or omitted as needed, or appropriately combined.

[0027] [1. Structure]

[0028] Figure 1 This is an exploded perspective view of the motor 1 according to the embodiment. The motor 1 is an internal rotor type brushless DC motor. The motor 1 includes a rotor 2 and a stator 4.

[0029] Rotor 2 is a component that rotates integrally with shaft 3, which outputs the rotational driving force. Rotor 2 may include, for example, a magnet and a balancer. The general shape of rotor 2 may be cylindrical or polygonal. The cylindrical surface (side surface) of rotor 2 is opposite to stator 4. On the bottom surface (top surface) of rotor 2, shaft 3 is fixed in a position coaxial with rotor 2.

[0030] The stator 4 is a component that generates a magnetic field for rotating the rotor 2. The stator 4 is configured to be radially opposed to the rotor 2. In this embodiment, the stator 4 is located radially outward of the rotor 2. The stator 4 is generally cylindrical, for example. Inside the stator 4, the rotor 2 is rotatably mounted coaxially with the stator 4. The orientation related to the structure of the motor 1 can be defined based on the configuration of the rotor 2, shaft 3, stator 4, etc.

[0031] Figure 1 R in o R indicates the radial-outward direction. i Indicates the radial-inward direction. R o For example, it is a direction that is perpendicular to the cylinder shaft of stator 4 and away from the cylinder shaft of stator 4.

[0032] Figure 1 A in o This indicates the axial-outward direction, meaning the direction parallel to the terminal's extension. A i Indicates the axial-inward direction, that is, the direction relative to A. o In the opposite direction. A o For example, it is a direction that is perpendicular to the end face of stator 4 and away from the end face of stator 4.

[0033] Figure 1 C in c Indicates the circumferential-clockwise direction, C a Indicates the circumferential-anticlockwise direction. C c C a For example, towards the axially inward side A i The direction of rotation when observing the end face of stator 4.

[0034] The stator 4 has a stator core 5, teeth 6, windings 7 and insulating components 8.

[0035] The stator core 5 is a cylindrical portion formed by stacking multiple steel plates along the axial direction of shaft 3. The teeth 6 are formed in the stator core 5. The teeth 6 are formed from the inner circumferential surface (inner cylinder surface) of the stator core 5 towards the radially inward direction R. i The shape is highlighted. In this embodiment, multiple teeth 6 are arranged with a certain interval in the circumferential direction. The radial inner side R of each tooth 6... iAt the end of the rotor 2, blades are provided in a curved shape to maintain a clearance of a specified size relative to the rotor 2.

[0036] Winding 7 is a conductor forming a coil inside the stator core 5 to generate a magnetic field. Winding 7 is wound around each tooth 6. The two ends of each winding 7 are connected to other windings 7 and leads 9. Figure 1 The diagram shows 18 windings 7 and 3 sets of leads 9 (4 leads per set, 3 sets of leads 9). The number of windings 7 and the number of sets and leads 9 are not limited to the quantities shown above. The leads 9 (conductors) extend from the windings 7 towards the axially outer A. o The upright setting is configured. Terminals 20 are connected to each lead 9. Figure 1 The diagram shows three terminals 20.

[0037] To prevent short circuits, winding 7 and lead 9 are ideally to have a coating (film). Furthermore, the portion of lead 9 clamped at clamping face 27 can be a coated conductor (e.g., enameled wire), a conductor without coating (e.g., copper wire), a conductor other than a conductor, or a component for electrical conduction such as a pin or jumper. Similarly, terminals 20 can be any component for electrical conduction (wire, conductor), and their shape, quantity, and size can be appropriately selected.

[0038] The insulating member 8 is a component that electrically insulates the winding 7 wound on the tooth 6 relative to the stator core 5. The insulating member 8 is provided at least on the surface of the tooth 6. In this embodiment, the insulating member 8 is formed to insulate the inner circumferential surface of the stator core 5, the surface of the tooth 6, and the radially outer R of the blade portion. o The shape of the surface covered by the insulating element 8. The insulating element 8 is formed of, for example, insulating resin, ceramic, glass, etc. The winding 7 is wound around the tooth 6 with respect to the insulating element 8. Therefore, the winding 7 is in non-contact with the steel plate constituting the stator core 5.

[0039] The stator 4 is adapted to include a connection structure for connecting the terminal 20 to the lead 9. This connection structure includes a hole 26 and a connecting portion 25, which will be described later. Furthermore, the stator 4 of this embodiment also includes a terminal holding structure for holding the terminal 20 connected to the lead 9. This terminal holding structure includes a base member 10 and a holding member 11. The holding member 11 may be integrally provided with the base member 10. Alternatively, the holding member 11 may be separately provided with the base member 10 and mounted on the base member 10. The holding member 11 may also be detachable from the base member 10.

[0040] The base member 10 is a planar member disposed on the end face of the stator 4. The base member 10 is, for example, formed as a circular ring with the center portion of the disc hollowed out. The base member 10 is, for example, mounted on the end face of the stator core 5 and the insulating member 8. The base member 10 extends axially outward along the winding 7 and the insulating member 8. o The end is equipped with.

[0041] The retaining member 11 is mounted on the axial outer side A of the base member 10. o The terminal 20 is held by a retaining member 11. The retaining member 11 is shaped to allow the terminal 20 to move relative to the retaining member 11 within a specified range. The retaining member 11 has the function of limiting (controlling) the range of movement of the terminal 20 within the specified range. In other words, the terminal 20 is held by the retaining member 11 so that it can move relative to the retaining member 11 only within a specified range. Figure 1 This indicates a structure formed by integrating multiple retaining members 11. Each retaining member 11 enables one of the multiple terminals 20 to move independently within a specified range.

[0042] Figure 2 This is a perspective view obtained by enlarging the main parts of the terminal 20 and the retaining member 11. Figure 2 The retaining member 11 includes an end retaining part 12, a base surface 13, a lead wire laying part 14, a protruding part 15 (track structure), and a second end retaining part 16.

[0043] The end retaining portion 12 is formed in a Π shape and is a portion that retains one end of the terminal 20 in a movable manner. The end retaining portion 12, for example, is located towards the axially inward side A. i The retaining member 11 has a Π-shaped shape when observed. Here, "Π-shaped" refers to a recessed shape (a box-shaped structure with one side open) capable of accommodating one end of the terminal 20. One end of the leg 21 of the terminal 20, described later, is movably held in the end retaining portion 12. That is, the terminal 20 is held with a clearance relative to the end retaining portion 12. The end retaining portion 12 holds the terminal 20 in a manner that allows it to move radially and circumferentially.

[0044] The base surface 13 is a planar portion on which the terminal 20 is mounted. The base surface 13 is in contact with the bottom surface 22 of the terminal 20, which will be described later. As a result, the axial position of the terminal 20 is stable.

[0045] The lead wire laying section 14 is a part in which the retaining member 11 is shaped to pass through along the axial direction. Figure 2 The lead wire arrangement portion 14 shown becomes the radial outer side R of the retaining member 11. o The shape obtained by cutting off the face (radially inward R) i(The shape is recessed). However, the lead-layout portion 14 can also be configured as a through hole. A lead 9, connected to the terminal 20, is laid in the lead-layout portion 14. A recess or hole corresponding to the lead-layout portion 14 is also formed on the base member 10. The lead 9 is positioned axially outward of the winding 7 at a distance A. o The end face passes through the inside of the lead wire laying section 14 in a roughly vertical position.

[0046] The protruding portion 15 is part of a track structure shaped to allow the terminal 20 to slide relative to the retaining member 11 in a predetermined direction (e.g., radially). The protruding portion 15 is formed in a rib-like shape protruding from the base surface 13 of the retaining member 11 opposite to the terminal 20. The protruding direction of the protruding portion 15 is axially outward A. o The direction of the extension of the convex portion 15 is, for example, along the radial direction.

[0047] However, the direction of extension of the protrusion 15 is not limited to the radial direction. The protrusion 15 engages with the recess 24 of the terminal 20, which will be described later. Therefore, the movement direction of the terminal 20 is limited to the direction of extension of the protrusion 15 (along the radial direction). Furthermore, the circumferential positioning accuracy of the terminal 20 is improved. The shape of the protrusion 15 is not limited to a rib shape. The protrusion 15 can be any shape capable of engaging with the recess 24, for example, it can be a dot shape or a surface shape.

[0048] Figure 2 The raised portion 15 shown is positioned adjacent to the lead wire laying portion 14. This suppresses the offset (circumferential offset) of the connection position between the lead wire 9 and the terminal 20, and easily maintains a good connection between the lead wire 9 and the terminal 20.

[0049] The second end retaining portion 16, together with the end retaining portion 12, functions to retain the terminal 20 in a movable manner. The second end retaining portion 16 is formed to retain the other end of the terminal 20 held by the end retaining portion 12 in a movable shape. The second end retaining portion 16, for example, faces axially inward A in the same direction as the end retaining portion 12. i When observing the retaining member 11, its shape is formed as a Π (opposite to the end retaining part 12). The second end retaining part 16 holds, for example, the other end of the leg 21 of the terminal 20 so that it can move.

[0050] Figure 3This is a top view of terminal 20 and retaining member 11, with terminal 20 indicated by dashed lines. Retaining member 11 may also have a third end retaining portion 17 instead of the second end retaining portion 16. The third end retaining portion 17, together with the end retaining portion 12, functions to retain terminal 20 in a movable manner. Like the second end retaining portion 16, the third end retaining portion 17 also functions to retain the other end of terminal 20 held by end retaining portion 12 in a movable manner. The third end retaining portion 17 may be formed, for example, as a flat plate that can surface-contact with the plate surface of the leg portion 21 (described later) of terminal 20.

[0051] The radial movement range of the terminal 20 disposed on the base surface 13 is limited at least by the end retaining portion 12. Furthermore, the circumferential movement of the terminal 20 is limited by the protrusion 15. The terminal 20 is held in the retaining member 11 in a state where it can move slightly radially along the extension direction of the protrusion 15. Additionally, each of the plurality of terminals 20 is held in the retaining member 11 in a state where it can move individually within a predetermined range.

[0052] like Figure 2 As shown, terminal 20 is formed by partially bending a flat conductor cut to a predetermined shape. Terminal 20 includes a leg 21, a bottom surface 22, a strip 23, a recess 24 (track structure), and a connecting portion 25.

[0053] Leg 21 is a flat portion that rests on the base surface 13. Bottom surface 22 is... Figure 2 The end face (axial inner side A) located at the lower end of leg 21 is shown. i (The end face). The leg 21 is placed on the retaining member 11 with its bottom surface 22 in contact with the base surface 13. The orientation of the plate surface of the leg 21 is such that the normal is along the radial direction. However, it is not necessary for the normal direction of the leg 21 to be exactly the same as the radial direction.

[0054] The strip-shaped portion 23 is a planar portion formed in the shape of a strip, which is flush with the leg portion 21. The strip-shaped portion 23 is formed to extend from the leg portion 21 outward in an axial direction A. o The extended shape. The strip 23 is electrically connected at a predetermined cycle to either the positive or negative side of the DC power supply for, for example, the drive motor 1.

[0055] The recess 24 is the part that engages with the protrusion 15 of the retaining member 11. The recess 24 is formed such that it extends from the bottom surface 22 of the terminal 20 toward the axially outward A. o The recessed shape. The terminal 20 is positioned circumferentially by the engagement of the recess 24 with the protrusion 15. The recess 24 is part of a track structure formed in a shape that allows the terminal 20 to slide relative to the retaining member 11 in a predetermined direction (e.g., radial).

[0056] Connector 25 is the part that connects to lead 9. For example... Figure 3 As shown, with the end of terminal 20 held in end-holding portion 12, the connecting portion 25 is located near, directly above, the lead wire laying portion 14. The lead wire 9 is connected to the connecting portion 25 via, for example, thermoforming (thermal riveting, pulse heating, etc.), spot welding, or soldering (hard soldering). Furthermore, as... Figure 2 As shown, the connecting portion 25 is positioned axially outward of the leg portion 21 by A. o The position of the connection between the lead 9 and the connecting part 25 is such that it is located axially outward from the base surface 13 by A. o The positions are separated. Therefore, even when the lead 9 and the connector 25 are connected, the terminal 20 can easily move or tilt slightly in the radial direction.

[0057] Figure 4 (A) to (D) are perspective views showing an enlarged view of the main part of terminal 20. As previously described, terminal 20 is formed by bending a flat plate. Figure 4 (A) indicates the terminal 20 before the connection portion 25 is bent, before completion. Figure 4 (B) indicates the completed terminal 20 after the connecting part 25 is bent. Figure 4 (C) indicates that terminal 20 is connected to lead 9. Figure 4 (D) indicates terminal 20 as a modified example. Hereinafter, in distinguishing between terminal 20 before completion (terminal 20 without bending the connecting part 25) and terminal 20 after completion (terminal 20 after bending the connecting part 25), the former will be referred to as terminal body 30.

[0058] like Figure 4 As shown in (A), the terminal body 30 is a flat plate, formed, for example, by cutting a flat plate into a predetermined shape. A hole 26 is provided in the terminal body 30. Figure 4 As shown in (C), a lead 9, which serves as a conductor, passes through the hole 26. With the lead 9 passing through the hole 26, it is electrically connected to the terminal body 30 (terminal 20). That is, the area around the hole 26 forms a connecting portion 25, and the hole 26 and the connecting portion 25 constitute a connection structure. It should be noted that other components may also be placed between the terminal 20 and the lead 9. For example, they may be connected by installing and fusing a ring-shaped copper component between the terminal 20 and the lead 9.

[0059] Figure 4 The hole 26 shown in (A) is a closed hole whose outline is an end that does not reach the plate surface that forms the connecting part 25. Figure 4In (A) and (B), the double-dotted line L represents the fold line corresponding to the rotation center during bending. The position of the fold line L is, for example, set at a position slightly separated from the plate surface of the connecting portion 25. The connecting portion 25 is formed by folding back at a position perpendicular to the hole 26 in the front view of the hole 26 (front view of the connecting portion 25 before completion). The direction of the folded-back connecting portion 25 is as follows... Figure 2 As shown, the radially outer R is held in the state of holding member 11. o .

[0060] The two adjacent portions of the perimeter of the hole 26 in the orthogonal direction of the fold line L relative to the hole 26 are called clamping face portions 27. Similarly, the two adjacent portions of the perimeter of the hole 26 in the direction of extension of the fold line L relative to the hole 26 are called shoulder strap portions 28. The connection structure of this embodiment includes clamping face portions 27 and shoulder strap portions 28. The clamping face portion 27 is as follows... Figure 4 As shown in (C), the part of the connection portion 25 of the completed terminal 20 where the lead wire 9 is clamped in the radial direction.

[0061] The portion of the lead 9 that is clamped to the clamping facet 27 is clamped to the clamping facet 27 in a closed state (in other words, in a state of approximately contact with each other, a bundled state). During thermoforming the lead 9 and the connecting portion 25, the lead 9 is thermoformed with the welding electrode surface in contact with each of the two clamping facets 27. The two clamping facets 27 are preferably configured to be approximately parallel. It should be noted that during thermoforming, the two clamping facets 27 press the lead 9 together in a direction that brings them closer together. Therefore, the two clamping facets 27 do not need to be strictly parallel. Furthermore, the surface of the clamping facet 27 that is in contact with the lead 9 can be plated or surface-finished as needed. For example, solder plating to stabilize the bonding state or star-shaped knurling to promote coating peeling can also be applied.

[0062] The shoulder strap section 28 connects the two sections that hold the faceplate 27 in place. For example... Figure 4 As shown in (C), the shoulder strap portions 28 are located at both circumferential ends of the clamping face 27. The shoulder strap portions 28 are shaped like an inverted U, opening towards the bottom surface 22 when viewed circumferentially from the connecting portion 25. The two shoulder strap portions 28 function as the initial current flow path when the lead wire 9 and the connecting portion 25 are heat-pressed together. In the case where the lead wire 9 has a coating, the lead wire 9 and the connecting portion 25 are joined and heat-pressed together after the coating melts due to the resistance heating of the electrodes.

[0063] The joining methods mentioned here include not only press-fitting (mechanical joining) but also metallurgical joining. Metallurgical joining refers to a joining state in which an alloy layer is formed by the interdiffusion of metal atoms at the contact surfaces. Furthermore, pulse heating can be used as a specific example of hot press-fitting. Alternatively, other joining methods can be used instead of hot press-fitting. For example, spot welding and brazing (hard brazing) can also be used.

[0064] With the lead wire 9 passing through the hole 26, the joint portion of the lead wire 9 is surrounded by the clamping surface 27 and the shoulder strap portion 28 surrounding the hole 26, thus restricting movement and preventing it from spreading out. Furthermore, by optimizing the shape of the hole 26, the joint portions of the lead wire 9 can be neatly arranged in a row circumferentially. Therefore, during the connection of the lead wire 9 and the connector 25, the position of the joint portion of the lead wire 9 is stable, preventing multiple wires from overlapping and breaking, or uneven connection. Consequently, the crimping quality, welding quality, and soldering quality at the connector 25 are improved.

[0065] The shape of the hole 26 can also be as follows: Figure 4 As shown in (D), the outline of the hole extends to the end of the plate surface forming the connecting portion 25. In this case, the position of the gap connecting the hole portion 26 to the end of the plate surface can be set at the clamping surface 27 or at the shoulder strap portion 28. In the case of the hot-pressed lead wire 9 and the connecting portion 25, for example, a gap narrower than the welding electrode can be provided at the clamping surface 27. It should be noted that the hole portion 26 can be also referred to as a "slit" or "opening".

[0066] Next, the dimensions of the terminal body 30 (terminal 20) will be described in detail. For example... Figure 4 As shown in (A), the circumferential (width direction) dimension of the hole 26 is W0. This dimension W0 is set according to the diameter and number of leads 9 connected to the connecting part 25. For example, the dimension W0 is set to have a dimension corresponding to the total diameter of the number of leads 9. The "dimension corresponding to the total diameter of the number of leads 9" mentioned here includes a dimension that is sufficient to the extent that the leads 9 do not need to be pressed in when inserted into the hole 26, or a dimension that is sufficient to the extent that it does not reduce the workability of inserting the leads 9 into the hole 26.

[0067] For example, when four leads 9 of diameter d are connected to the connector 25 in an arrangement, the dimension W0 is set to, for example, 4d to 5d. The dimension W0 can be the same as 4d or larger than 4d. By setting the dimension W0 to correspond to the sum of the diameters of the number of leads 9, the leads 9 can easily be clustered together inside the hole 26, improving the connection between the leads 9 and the connector 25. Furthermore, it is easier to pass the leads 9 through the hole 26, improving workability during manufacturing.

[0068] like Figure 4 As shown in (B), the gap dimension (minimum dimension) between the two clamping surfaces 27 is D0. Dimension D0 can also be considered as the height of the hole 26 in the folded-back state of the connecting part 25. This dimension D0, like dimension W0, is set according to the diameter and number of leads 9 connected to the connecting part 25. Dimension D0 is, for example, set to have a dimension corresponding to the diameter of one lead 9. The phrase "dimension corresponding to the diameter of one lead 9" includes either a dimension that allows for insertion of the lead 9 into the hole 26 without requiring pressing, or a dimension that allows for insertion of the lead 9 into the hole 26 without reducing workability.

[0069] For example, when a lead wire 9 of diameter d is connected to the connecting portion 25 in a radially non-overlapping manner, the dimension D0 is set to a value between 1d and 2d. Dimension D0 can be the same as 1d or larger than 1d. By setting dimension D0 to correspond to the diameter of one lead wire 9, the lead wires 9 can easily be brought together inside the hole 26, improving the connection between the lead wire 9 and the connecting portion 25. Furthermore, it is easier to pass the lead wire 9 through the hole 26, improving workability during manufacturing.

[0070] like Figure 4 As shown in (A), the circumferential (width direction) dimensions of the two shoulder strap portions 28 are W1 and W2, respectively. These dimensions W1 and W2 can be set according to the connection method between the lead wire 9 and the connecting portion 25. These dimensions W1 and W2 can be the same or different from each other. For example, when the lead wire 9 and the connecting portion 25 are heat-pressed together, these dimensions W1 and W2 can also be set to the same dimension. Alternatively, the two shoulder strap portions 28 can also have the same conductor cross-sectional area. The conductor cross-sectional area referred to here means, in the case of uniform plate thickness, equivalent to Figure 4 The product of dimensions W1 and W2 shown in (A) and the thickness of the shoulder strap portion 28. It should be noted that when the thickness of the two shoulder strap portions 28 is constant, the so-called identical conductor cross-sectional area is synonymous with dimensions W1 and W2 being the same dimension.

[0071] like Figure 4 As shown in (A), the circumferential (width direction) dimension of the leg 21 and bottom surface 22 of terminal 20 is W3. Furthermore, the circumferential (width direction) dimension of the recess 24 is W4. Moreover, as... Figure 4 As shown in (B), the radial dimension of the leg 21 and the bottom surface 22 is D1. These dimensions W3, W4, and D1 are set according to the shape of the retaining member 11.

[0072] Figure 5(A) and (B) are cross-sectional views of the retaining member 11 of the retaining terminal 20. Figure 5 Figure (A) shows the case where the movable range of terminal 20 is defined by end retaining portion 12 and second end retaining portion 16. Here, when considering the movable range of terminal 20 formed by end retaining portion 12 and second end retaining portion 16, its circumferential (width direction) dimension is W5, and its radial (thickness direction) dimension is D2. The dimension W3 of terminal 20 is set to a value smaller than dimension W5, and the dimension D1 is set to a value smaller than dimension D2. This ensures sufficient margin (adjustment amount) for fine-tuning the position of terminal 20.

[0073] Figure 5 Figure (B) shows the case where the movable range of terminal 20 is defined by end retainer 12 and third end retainer 17. In this case, dimension D1 is set to a value smaller than dimension D2. Furthermore, the distance between the inner surfaces of the third end retainer 17 and the surface furthest from the third end retainer 17 is W6. This distance W6 is set to a value smaller than dimension W3 of terminal 20. Therefore, the third end retainer 17 can make surface contact with the plate surface of leg 21.

[0074] Figure 6 This is a cross-sectional view illustrating the relationship (track structure) between the recess 24 of the terminal 20 and the protrusion 15 of the retaining member 11. The circumferential (width direction) dimension of the protrusion 15 is W4, which is the same as the circumferential (width direction) dimension W4 of the recess 24. The protrusion 15 is formed in a direction orthogonal to the recess setting direction (circumferential clockwise side C) relative to the recess 24. c and circumferential counterclockwise C a The shape of the end face contact. As a result, the recess 24 engages (i.e., fits) with the protrusion 15 in the circumferential direction without gap, and the circumferential positioning accuracy of the terminal 20 is improved.

[0075] Furthermore, the axial dimension (height) of the protruding portion 15 is H1, and the axial dimension (depth) of the recess 24 is H2. The depth H2 of the recess 24 is set to be greater than the height H1 of the protruding portion 15. The protruding portion 15 is formed in a recessed direction relative to the recess 24 (axially outward A). o The end face of the terminal 20 is non-contact. As a result, physical interference and wobbling caused by manufacturing errors of the protrusion 15 and the recess 24 are suppressed, and the holding state of the terminal 20 is easily stabilized.

[0076] Figure 7 It is a three-dimensional diagram used to illustrate the track structure as a variation. Figure 2 , Figure 6 The track structure shown is designed to engage the protruding portion 15 of the retaining member 11 with the recessed portion 24 of the terminal 20. On the other hand, Figure 7 The track structure shown is a structure in which the groove 18 of the retaining member 11 engages with the protrusion 29 of the terminal 20. The groove 18 is formed into a groove shape that is recessed from the base surface 13 of the retaining member 11 opposite to the terminal 20.

[0077] The recessed direction of the groove 18 is towards the axial inner side A. i The direction in which the groove 18 extends is along a predetermined direction (e.g., radial). Additionally, the protrusion 29 is a portion that engages with the groove 18. The protrusion 29 is formed extending from the bottom surface 22 of the terminal 20 toward the axially inward side A. i The prominent shape. In such a track structure, the direction of movement of terminal 20 is also restricted to the direction of extension of slot 18 (along the radial direction), which improves the circumferential positioning accuracy of terminal 20.

[0078] Figure 2 , Figure 7 The track structure shown is one in which the concave-convex shape of the retaining member 11 engages with the concave-convex shape of the terminal 20. The concave-convex shape of the retaining member 11 is, for example, a rib-like shape such as the protrusion 15 or the groove 18. However, the concave-convex shape of the retaining member 11 is not limited to a rib shape; it can also be a point shape or a surface shape. That is, one of the retaining member 11 and the terminal 20 may have a protrusion protruding toward the other of the retaining member 11 and the terminal 20, and the other may have a recess that engages with the protrusion.

[0079] [2. Effects]

[0080] (1) The connection structure involved in this embodiment is a connection structure for connecting the lead 9 (conductor) to the terminal 20, and has a hole 26 and a connecting portion 25. The hole 26 is a portion formed in the plate-shaped terminal body 30 constituting the terminal 20 and through which the lead 9 passes. The connecting portion 25 is a portion formed by folding the terminal body 30 back at the position that crosses the hole 26 and clamping the lead 9.

[0081] With this structure, the lead 9 remains inside the hole 26, thus preventing it from detaching from the connector 25. Even if an external force perpendicular to the extension of the lead 9 is applied to it, the lead 9 will not move outward from the hole 26 and detach. This connection can be easily achieved, for example, simply by passing the tip of the lead 9 through the hole 26. Therefore, the ease and efficiency of the connection between the lead 9 and the terminal 20 can be improved.

[0082] (2) In the above connection structure, lead 9 (conductor) can be composed of multiple wires. Figure 4In the example shown in (C), four leads 9 are connected to one terminal 20. Here, the width W0 of the hole 26 is set to a size corresponding to the total diameter of the number of leads 9, which is 4d. Furthermore, the height D0 of the hole 26 is set to a size corresponding to the diameter of one lead 9, which is 1d. This shape of the hole 26 allows the joint portions of the leads 9 to be neatly arranged in a row circumferentially. Therefore, when the leads 9 are joined to the connector 25, the position of the joint portions of the leads 9 is stable, preventing multiple wires from overlapping and breaking, or uneven joining. Thus, the crimping quality, welding quality, and soldering quality at the connector 25 can be improved.

[0083] (3) The above connection structure is as follows Figure 4 As shown in (A) to (C), the terminal body 30 has two shoulder strap portions 28. The shoulder strap portions 28 are formed in the terminal body 30 and are located adjacent to the hole portion 26 in the direction of extension of the fold line L of the terminal body 30. With this structure, the lead wire 9 can be radially clamped by the two shoulder strap portions 28, which can improve the stability of the connection between the lead wire 9 and the terminal 20.

[0084] Furthermore, the two shoulder strap portions 28 are configured to have the same conductor cross-sectional area. For example, for two shoulder strap portions 28 with the same plate thickness, the circumferential (width direction) dimensions W1 and W2 are formed to be the same size. In this way, by making the conductor cross-sectional areas of the two shoulder strap portions 28 the same, when the connecting portion 25 of the terminal body 30 is bent along the fold line L, it is easy to make the bending shape of the two shoulder strap portions 28 approximately the same. As a result, the two clamping surfaces 27 can be made approximately parallel, and the bonding quality (crimping quality, welding quality, soldering quality) at the connecting portion 25 can be improved.

[0085] (4) The connection structure described above is applied to the stator 4 according to this embodiment. The stator 4 includes: a retaining member 11 that retains the terminal 20 connected to the winding 7 of the stator 4; and a base member 10 that mounts the retaining member 11. With such a structure, the ease and efficiency of the operation related to connecting the lead 9 to the terminal 20 can be improved, and the ease and efficiency of the operation related to manufacturing the stator 4 can also be improved. In addition, the lead 9 will not come out of the hole 26, thereby stabilizing the energization state to the winding 7, and thus providing a stator 4 that stabilizes the rotation state of the rotor 2.

[0086] (5) The motor 1 according to this embodiment includes the stator 4 described above, and the rotor 2 arranged radially opposite to the stator 4. With this structure, the ease and efficiency of the connection between the lead 9 and the terminal 20 can be improved, and the ease and efficiency of the manufacturing of the motor 1 can also be improved. In addition, the lead 9 will not come out of the hole 26, thereby stabilizing the energization state to the winding 7. Therefore, the quality of the motor 1 can be improved.

[0087] (6) The terminal 20 according to this embodiment includes a plate-shaped terminal body 30, a hole 26, and a connecting portion 25. The hole 26 is formed in the terminal body 30. A lead wire 9 (conductor) passes through the hole 26. The connecting portion 25 is formed by folding the terminal body 30 back at a position that crosses the hole 26. The lead wire 9 is held in the connecting portion 25. With this structure, it is easy to keep the lead wire 9 inside the hole 26 of the terminal 20, and it is easy to ensure that the lead wire 9 does not detach from the connecting portion 25 of the terminal 20. Therefore, the ease of operation and work efficiency related to the connection of the lead wire 9 and the terminal 20 can be improved.

[0088] [3. Other]

[0089] The above-described connection structure can also be applied to the commutator risers (the parts of the commutator segments with connecting wires, commutator feet, and commutator legs) in the rotor of a brushed motor. Furthermore, the above-described connection structure is not only applicable to motor 1 but also to generators, rotary transformers, pumps, sensors, etc. For example, by... Figure 1 The rotor 2 shown is replaced with a rotary transformer rotor, which enables the realization of a rotary transformer having the above-described connection structure. The above-described connection structure can be applied to components and devices having at least a hole 26 and a connection portion 25.

[0090] The type of motor 1 to which the above-described connection structure is applied is not limited to an internal rotor type brushless DC motor. The above-described connection structure is applicable not only to DC motors but also to AC motors. Furthermore, the above-described connection structure is applicable not only to brushless motors but also to brushed motors. Moreover, the above-described connection structure is applicable not only to internal rotor type motors but also to external rotor type motors.

[0091] The shapes of terminal 20 and terminal body 30 are not limited to, for example Figure 4 The shape is as shown in (A) to (D). In addition, the leg 21, bottom surface 22, strip 23, and recess 24 are elements that can be omitted. Figure 4 The connecting portion 25 shown in (B) extends the terminal body 30 radially outward R with the fold-back line L as the center. o The shape is folded back, but the folding direction of the connecting part 25 can also be radially inward R. i .

[0092] [Industry Applicability]

[0093] This application can be applied to the manufacturing industry of components having a connection structure for conductors connected to terminals. This application can be applied to the manufacturing industry of stators with applicable connection structures. This application can be applied to the manufacturing industry of motors, generators, pumps, rotary transformers, and sensors, including stators with applicable connection structures. This application can be applied to the manufacturing industry of terminals.

[0094] [Explanation of Labels in the Attached Image]

[0095] 1. Motor

[0096] 2 rotors

[0097] 3-axis

[0098] 4. Stator

[0099] 5. Stator core

[0100] 6 teeth

[0101] 7 windings

[0102] 8 Insulating components

[0103] 9. Leads (Conductors)

[0104] 10. Base components

[0105] 11 Retaining components

[0106] 12 End retaining part

[0107] 13 Base surface

[0108] 14 Lead wire laying section

[0109] 15. Raised section (track structure)

[0110] 16 Second end retaining part

[0111] 17 Third end retaining part

[0112] 18. Track section (railway structure)

[0113] 20 terminals

[0114] 21. Legs

[0115] 22 Bottom

[0116] 23. Band-like portion

[0117] 24. Recess (track structure)

[0118] 25 Connecting part

[0119] 26 Holes

[0120] 27. Clamping the face

[0121] 28. Shoulder strap section

[0122] 29. Convex part (track structure)

[0123] 30 terminal body

[0124] A o Axial outer side

[0125] A i Axial inner side

[0126] R o radial outer side

[0127] R i radial inner side

[0128] C c Zhou Xiang clockwise side

[0129] C a Circumferential counterclockwise side

[0130] L-shaped foldback line.

Claims

1. A connection structure, which is a connection structure for a conductor connected to a terminal, characterized in that, The connection structure includes: A hole formed in the plate-shaped terminal body constituting the terminal, through which the conductor passes; and The connecting portion is formed by folding the terminal body back at a position that passes through the hole, and clamps the conductor.

2. The connection structure according to claim 1, characterized in that, The conductor is composed of multiple wires. The width of the hole has a dimension corresponding to the sum of the diameters of the number of wires. The height of the hole has a dimension corresponding to the diameter of one of the wires.

3. The connection structure according to claim 2, characterized in that, The connection structure includes two shoulder strap portions formed on the terminal body and adjacent to the hole portion in the direction of the extension of the fold line of the terminal body. The two shoulder strap sections have the same conductor cross-sectional area.

4. A stator, characterized in that, The stator is adapted to the connection structure described in any one of claims 1 to 3. The stator comprises: A retaining member that holds the terminal connected to the winding of the stator; and A base component on which the retaining component is mounted.

5. A motor, characterized in that, The motor has the following features: The stator as claimed in claim 4; and, A rotor that is radially opposed to the stator.

6. A terminal, characterized in that, The terminal includes: Plate-shaped terminal body; An aperture formed in the terminal body for a conductor to pass through; and The connecting portion is formed by folding the terminal body back at a position that passes through the hole, and clamps the conductor.

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