Straight-strip-shaped stator core capable of being bent in forward and reverse directions, and stator structure of electric motor

Abstract

The present application relates to the technical field of electric motors, and in particular to a straight-strip-shaped stator core capable of being bent in the forward and reverse directions, and a stator structure of an electric motor. The straight-strip-shaped core comprises three or more stator-core split bodies, wherein the three or more stator-core split bodies are in a joined-block-like straight strip shape; every two adjacent stator-core split bodies are connected to each other by means of a connecting rib; and each stator-core split body comprises a core yoke portion, a pole shoe, opposite connection bevel edges and a core tooth portion, the two opposite connection bevel edges being respectively symmetrically and fixedly connected to two ends of the core yoke portion, and each connecting rib being fixedly connected to two close opposite connection bevel edges of the corresponding two adjacent stator-core split bodies, and symmetrical and inwards-concave bending clearance circular-arc-shaped corners being respectively provided on two sides of each connecting rib. In the present application, the stator core is designed as a straight-strip-shaped core, can be reversely rotated into a circular (square) shape so as to ensure the quality and quantity of winding, and can be rotated in a forward direction into a circular (square) shape to form a stator, such that sufficient winding space can be provided so as to obtain the best winding speed, and the effect of ensuring the minimum damage to an enameled wire during a winding process can also be achieved.

Description

A stator straight iron core with positive and negative bending and a motor stator structure Technical Field

[0001] The present application relates to the field of motor technology, and in particular to a stator straight bar core with positive and negative bending and a motor stator structure. Background Art

[0002] The structure of the motor stator core determines the winding method of its winding coil. The existing stator core structure and winding method basically cannot meet the ideal requirements. The specific manifestations are:

[0003] (1) In order to ensure that the outer sheath of the enameled wire is not damaged (pulled off, cracked, or scratched) during the winding process and to improve the reliability of its insulation, the winding speed is severely limited, resulting in low production efficiency of a single winding machine and the inability to reduce processing costs; and in large-scale production, the demand for winding machines is very large, the capital investment is too large, and the cost-effectiveness is extremely low; it is difficult to recover the investment.

[0004] (2) In order to improve production efficiency, some companies have to reduce the reliability of enameled wire insulation, speed up the winding speed, and then insulate the coils after winding (drip insulation varnish treatment); this also increases production costs.

[0005] (3) A stator core structure that can ensure both winding quality and production efficiency, as well as cost-effectiveness; currently, there is no stator core structure that provides sufficient space for winding to achieve the best winding effect; or the limitations are too strong. Technical issues

[0006] In order to increase the winding speed and reduce the damage to the enameled wire, the present application provides a stator straight bar core with positive and negative bending and a motor stator structure. Technical Solutions

[0007] A stator iron core with positive and negative bending, comprising three or more stator iron core segments, wherein the three or more stator iron core segments are in the form of connected block-shaped straight bars, and two adjacent stator iron core segments are connected by connecting ribs;

[0008] The stator core split includes a core yoke, a pole shoe, a connecting pair of oblique edges and a core tooth portion, wherein the two ends of the core tooth portion are respectively connected to the core yoke and the pole shoe, and two connecting pairs of oblique edges are provided, and the two connecting pairs of oblique edges are symmetrically connected to the two ends of the core yoke portion;

[0009] The convex rib is fixedly connected to two adjacent connecting oblique sides of two adjacent stator core segments, and two sides of the convex rib are respectively provided with a symmetrical and concave first bending and giving way circular arc angle and a second bending and giving way circular arc angle;

[0010] The first bending and giving way arc angle is located on the side of the siamed rib close to the pole shoe, and the second bending and giving way arc angle is located on the other side of the siamed rib away from the pole shoe.

[0011] By adopting the above technical solution, multiple stator core segments are arranged into a connected block-shaped straight bar, the stamping lamination production is convenient, and the material utilization rate is high; the stator core segments are fixedly connected into a straight bar by the connected ribs, and a symmetrical and concave first bending clearance arc angle and a second bending clearance arc angle are respectively arranged on both sides of the connected ribs. The first bending clearance arc angle and the second bending clearance arc angle meet the requirements of micro-bending tensile deformation clearance and bending stress strength during reverse winding and forward rolling of the stator core segments, so that adjacent connecting oblique sides can be plane-butted and attached. If the connected ribs are not provided with appropriate bending clearance arc angles and widths, the bending strength of the connected ribs is too high during rolling, making it difficult to butt and attach the connecting oblique sides of adjacent stator core segments, and the bending strength of the connected ribs is too low, which is prone to breakage.

[0012] Optionally, two adjacent connecting pairs of oblique side ends of the two stator cores are provided with semicircular concave-convex guiding and positioning parts.

[0013] By adopting the above technical solution, when the straight iron core is rolled in the forward direction, the semicircular concave-convex guiding and positioning parts are used to position and connect adjacent stator iron core splits, which makes the connection convenient and the positioning accurate, avoids the problem of docking offset, improves the integrity of the rolled stator iron core and ensures the accuracy of the combined size.

[0014] Optionally, the semicircular concave-convex guiding and positioning portion includes a semicircular arc groove fixedly opened at one connecting pair of oblique side ends and a semicircular arc protrusion fixedly arranged at the other connecting pair of oblique side ends, and the semicircular arc protrusion matches the semicircular arc groove.

[0015] By adopting the above technical solution, the semicircular arc-shaped guiding positioning makes the stator core bending and docking more stable and smooth.

[0016] Optionally, the end surface of the core yoke is provided with a first rivet point for stamping the laminations, and the end surface of the core tooth is provided with a second rivet point for stamping the laminations;

[0017] There are two first rivet points, which are symmetrically distributed on the end faces of the core yoke on both sides of the central axis of the core yoke, and the second rivet point is located at the center of the end face of the core tooth.

[0018] By adopting the above technical solution, the stator core is formed by stacking multiple stator punchings. The first rivet point and the second rivet point facilitate the connection and fixation of the multiple stator punchings, making the stator core structure formed by the multiple stator punchings more compact and reliable.

[0019] Optionally, the number of the stator core segments is four, and the angle between the oblique sides of two connecting ribs of the same segment is 90 degrees.

[0020] By adopting the above technical solution, the stator core structure formed by rotating four stator cores into a circle is suitable for the application of low pole pair motors.

[0021] Optionally, the number of the stator core segments is eight, and the angle between the oblique sides of two connecting ribs of the same segment is 45 degrees.

[0022] By adopting the above technical solution, the stator core structure formed by rotating eight stator cores into a circle is suitable for the application of high-pole-pair-number motors.

[0023] A motor stator structure comprises a stator core formed by rotating the above-mentioned stator straight bar core into a round shape, an insulating frame installed on the stator core, and a winding coil wound on the frame.

[0024] With the above technical solution, the insulating frame is used to separate the winding coil from the stator core.

[0025] Optionally, the insulating frame includes a front frame and a rear frame;

[0026] The rear frame includes an insulating arc-shaped wire slot baffle that rests against the pole shoe, an insulating plug-in plate inserted in the core slot between the core yoke and the pole shoe, an insulating end plate fixedly connecting the insulating arc-shaped wire slot baffle and the insulating plug-in plate in the core slot, a wire slot plane baffle fixedly connected to one end of the insulating plug-in plate in the core slot and flush with the insulating end plate, a circular power lead pin column fixed on the wire slot plane baffle, a circular bridge wire blocking column fixed on the wire slot plane baffle and located on both sides of the circular power lead pin column, and a hanging column with a groove vertically fixed on the wire slot plane baffle.

[0027] By adopting the above technical solution, the skeleton structure is reasonably designed. The split front skeleton and rear skeleton are convenient for assembly with the stator core. The front skeleton and rear skeleton are plugged into each other to form concave uniform wire slots for winding coils.

[0028] Optionally, the two outermost circular bridge wire blocking columns on the rear frame are solid cylinders, the circular power lead pin columns are hollow cylinders, and the ends of the circular power lead pin columns are provided with pin holes for connecting the power lead to the winding coil, and the wire hanging columns are spaced apart between adjacent circular power lead pin columns.

[0029] Using the above technical solution, the bridge wire blocking posts on the outermost sides of the front and rear frames are designed to constrain the bridge wires in the wire trough when crossing the bridge, preventing them from being exposed outside the trough and causing insufficient electrical clearance and creepage distance; the pin posts on the rear frame are provided with pin holes to facilitate the connection of power leads with pins; and the wire hanging posts are used to fix the bridge wires.

[0030] Optionally, the front frame and the rear frame have the same structure, which is convenient for hanging the bridge wires of different phase coils separately on the front and rear frames to prevent inter-phase voltage breakdown. Beneficial effects

[0031] This application includes at least one of the following beneficial technical effects:

[0032] (1) The stator core is designed to be a straight bar that can be folded in two directions. It can be rotated in the reverse direction to be round (square) and wound with guaranteed quality and quantity. After the winding is completed, it can be rotated in the forward direction to be round (square) and the stator is formed.

[0033] (2) The winding method is simple, fast and efficient; the insulation layer of the enameled wire is less damaged and has high reliability.

[0034] (3) The number of winding equipment is small, the capital investment is small, and the cost performance is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] FIG1 is a schematic diagram of the structure of a stator straight iron core according to the first embodiment;

[0036] FIG2 is an enlarged schematic diagram of portion A of FIG1 ;

[0037] Figure 3 is a schematic structural diagram of the stator core split;

[0038] FIG4 is a schematic structural diagram of a stator straight iron core in a reverse rotation state according to an embodiment;

[0039] FIG5 is an enlarged schematic diagram of portion B of FIG4 ;

[0040] FIG6 is a schematic structural diagram of a stator straight bar core in a forward circular state according to an embodiment;

[0041] FIG7 is an enlarged schematic diagram of portion C of FIG6 ;

[0042] Figure 8 is a schematic structural diagram of the rear frame;

[0043] FIG9 is a schematic structural diagram of the insulating sleeve plate for illustrating the rear frame;

[0044] FIG10 is a schematic top view of the assembled skeleton of FIG4;

[0045] FIG11 is a schematic front view of the assembled skeleton of FIG4;

[0046] FIG12 is a schematic diagram of a top view of the stator structure;

[0047] FIG13 is a schematic front view of the stator structure;

[0048] 14 is a schematic diagram of the structure of the stator straight iron core of Example 2;

[0049] 15 is a schematic structural diagram of the stator straight bar core in the reverse rotation state of the second embodiment;

[0050] FIG16 is a schematic structural diagram of the stator straight bar core in the forward circular state of the second embodiment.

[0051] In the accompanying drawings, 10, stator core; 20, front frame; 30, rear frame; 40, winding coil; 1, core yoke; 2, core tooth; 3, connecting oblique edges; 4, pole shoe; 5, process positioning groove; 6, first riveting point; 7, second riveting point; 8, semicircular concave-convex guiding positioning part; 81, semicircular arc groove; 82, semicircular arc protrusion; 9, first bending and giving way arc angle; 11, insulating arc-shaped wire slot baffle; 12, insulating plug-in plate in the core slot; 13, insulating end plate; 14, circular power lead pin column; 15, hanging column; 16, wire slot flat baffle; 17, second bending and giving way arc angle; 18, conjoined rib. Best Mode for Carrying Out the Invention

[0052] The present application is further described in detail below with reference to Figures 1-16. Example

[0053] As shown in FIG1 , a stator straight bar core with positive and negative bending includes three or more stator core segments, which are in the form of conjoined block-shaped straight bars, and two adjacent stator core segments are connected by conjoined ribs 18 ;

[0054] The stator core split includes a core yoke 1, a pole shoe 4, a connecting pair of oblique edges 3 and a core tooth 2. The two ends of the core tooth 2 are respectively connected to the middle of the core yoke 1 and the middle of the pole shoe 4. There are two connecting pairs of oblique edges 3, which are symmetrically fixed and connected to the two ends of the core yoke 1.

[0055] As shown in FIG2 , the convex rib 18 connects two adjacent stator cores and two adjacent connecting oblique edges 3 , and a symmetrical and concave first bending and giving way circular arc angle 9 and a second bending and giving way circular arc angle 17 are provided on both sides of the convex rib 18 ;

[0056] The first bending arc angle 9 is located on the side of the siamed rib 18 close to the pole shoe 4 , and the second bending arc angle 17 is located on the other side of the siamed rib 18 away from the pole shoe 4 .

[0057] In this embodiment, multiple stator core segments are configured as conjoined block-shaped straight bars, making stamping and lamination easy to manufacture and achieving high material utilization. The stator core segments are fixedly connected to form a straight bar by conjoined ribs 18. Symmetrical and inwardly concave first and second bending angles 9 and 17 are provided on either side of the ribs 18. These first and second bending angles 9 and 17 meet the requirements for micro-bending, tensile deformation, and bending stress strength during reverse and forward winding of the stator straight bar core, allowing adjacent connecting pairs of oblique edges 3 to abut against each other in a planar manner. If the ribs 18 are not configured with appropriate bending angles and widths, their bending strength will be too high during winding, making it difficult to abut against the connecting pairs of oblique edges 3 of adjacent stator core segments. If their bending strength is too low, the ribs 18 are prone to breakage.

[0058] As shown in FIG4 and FIG5, the stator straight iron core is rotated in the opposite direction so that the stator iron core is split and turned outward, and the winding iron core teeth 2 of the stator iron core are exposed, which is convenient for installing the insulating frame and quickly winding the coil.

[0059] As shown in Figures 6 and 7, the stator straight iron core is rotated in the forward direction to form the stator.

[0060] Specifically, in this embodiment, semicircular concave-convex guiding and positioning parts 8 are provided at the ends of the two adjacent connecting oblique sides 3 of the two stator cores.

[0061] In this embodiment, when the straight core is formed by forward rotation, the semicircular concave-convex guiding and positioning portion 8 is used to position and connect adjacent stator core segments, which facilitates connection and accurate positioning, avoids the problem of docking offset, improves the integrity of the stator core 10 formed by rotation, and ensures the accuracy of the combined dimensions.

[0062] Specifically, in this embodiment, the semicircular concave-convex guiding and positioning portion 8 includes a semicircular arc groove 81 fixedly opened at one end of the connecting pair of hypotenuses 3 and a semicircular arc protrusion 82 fixedly set at the other end of the connecting pair of hypotenuses 3, and the semicircular arc protrusion 82 matches the semicircular arc groove 81.

[0063] In this embodiment, the semicircular arc shape enables the stator core 10 to be bent and connected more smoothly.

[0064] Specifically, as shown in FIG3 , the end surface of the core yoke 1 is provided with a first rivet point 6 for stamping the laminations, and the end surface of the core tooth 2 is provided with a second rivet point 7 for stamping the laminations;

[0065] There are two first rivet points 6 symmetrically distributed on the end surface of the core yoke 1 on both sides of the central axis of the core yoke 1 , and the second rivet point 7 is located at the center of the end surface of the core tooth 2 .

[0066] In this embodiment, the stator core 10 is formed by stacking a plurality of stator punchings. The first rivet point 6 and the second rivet point 7 facilitate the connection and fixation of the plurality of stator punchings, making the stator core 10 formed by the plurality of stator punchings more compact and reliable.

[0067] Furthermore, a process positioning groove 5 is provided on the outer side of the core yoke 1. The process positioning groove 5 is used to locate the position of the stamped laminations, so that the positioning of the stamped laminations is convenient and accurate, and easy to manufacture.

[0068] Specifically, in this embodiment, the number of the stator core segments is four, and the included angle between the two connecting pairs of oblique sides 3 connected to the same connecting rib 18 is 90 degrees.

[0069] In this embodiment, the stator core 10 structure formed by rotating four stator cores separately is suitable for applications in four-pole motors with a low pole pair number.

[0070] A motor stator structure includes a stator core 10 formed by rotating the stator straight bar core in the forward direction, an insulating frame installed on the stator core 10, and a winding coil 40 wound on the frame.

[0071] In this embodiment, the insulating frame is used to separate the winding coil 40 from the stator core 10 .

[0072] Specifically, in this embodiment, the insulating frame includes a front frame 20 and a rear frame 30;

[0073] As shown in Figures 10 and 11, when the stator straight core is in the reverse rotation state, the front frame 20 and the rear frame 30 are installed on each stator core split, and then the coil is wound. The stator core can be wound simply and quickly to complete the required winding coil 40.

[0074] As shown in FIG12 and FIG13 , after the winding coil 40 is wound, it is rotated in the forward direction to obtain the motor stator structure.

[0075] As shown in Figures 8 and 9, the rear skeleton 30 includes an insulating arc-shaped wire slot baffle 11 that rests against the pole shoe 4, an insulating plug-in plate 12 inserted in the core slot between the core yoke 1 and the pole shoe 4, an insulating end plate 13 fixedly connected to the insulating arc-shaped wire slot baffle 11 and the insulating plug-in plate 12 in the core slot, a wire slot flat baffle 16 fixedly connected to one end of the insulating plug-in plate 12 in the core slot and flush with the insulating end plate 13, a circular power lead pin column 14 fixed on the wire slot flat baffle 16, a circular bridge wire blocking column fixed on the wire slot flat baffle 16 and located on both sides of the circular power lead pin column 14, and a wire hanging column 15 with a groove vertically fixed on the wire slot flat baffle 16.

[0076] In this embodiment, the frame structure is reasonably designed. The split front frame 20 and rear frame 30 are convenient for assembly with the stator core 10. The front frame 20 and rear frame 30 are plugged into each other to form concave uniform wire slots for winding coils.

[0077] Specifically, in this embodiment, the two outermost circular bridge wire blocking posts on the rear frame 30 are solid cylinders, the circular power lead pin posts 14 are hollow cylinders, and the ends of the circular power lead pin posts 14 are provided with pin holes for connecting the power lead with the winding coil, and the wire hanging posts 15 are spaced apart between adjacent circular power lead pin posts 14.

[0078] In this embodiment, the outermost circular bridge wire blocking posts of the front frame 20 and the rear frame 30 are used to constrain the bridge wires in the wire trough when crossing the bridge, to prevent the trough from being exposed and causing insufficient electrical clearance and creepage distance; the circular power lead pin posts 14 of the rear frame are provided with pin holes to facilitate the connection of the power lead with pins; the wire hanging posts 15 are used to fix the bridge wires.

[0079] Specifically, in this embodiment, the front frame 20 and the rear frame 30 have the same structure, which facilitates the separate hanging of the bridge wires of the coils of different phases on the front frame and the rear frame to prevent the phase-to-phase voltage breakdown. Modes for Carrying Out the Invention Example

[0080] As shown in FIG14 , the difference between this embodiment and the first embodiment is that the number of the stator core segments is eight, and the angle between the two connecting pairs of oblique sides 3 connected by the same connecting rib 18 is 45 degrees.

[0081] FIG15 shows the state of the eight stator cores after they are rotated in the reverse direction, and FIG16 shows the state of the eight stator cores after they are rotated in the forward direction.

[0082] In this embodiment, the stator core 10 structure formed by rotating eight stator cores separately is suitable for use in eight-pole motors with a high pole pair number.

[0083] The embodiments of this specific implementation are all preferred embodiments of this application and are not limited to applications in four-pole and eight-pole motors. They are also applicable to other low-pole-pair motors or other high-pole-pair motors. Therefore, any equivalent changes made based on the structure, shape, and principle of this application should be included within the scope of protection of this application.

Claims

1. A stator straight bar core with positive and negative bending, characterized in that: It comprises more than three stator core segments, the more than three stator core segments are in the form of connected blocks and straight strips, and two adjacent stator core segments are connected by connecting ribs (18); The stator core split comprises a core yoke (1), a pole shoe (4), a connecting pair of oblique edges (3) and a core tooth (2), the two ends of the core tooth (2) respectively connecting the core yoke (1) and the pole shoe (4), two connecting pairs of oblique edges (3) are provided, and the two connecting pairs of oblique edges (3) are respectively and symmetrically connected to the two ends of the core yoke (1); The connected rib (18) is fixedly connected to two adjacent connecting pairs of oblique edges (3) of two adjacent stator core segments, and two sides of the connected rib (18) are respectively provided with symmetrical and inwardly concave first bending clearance arc angles (9) and second bending clearance arc angles (17); The first bending and giving way circular arc angle (9) is located on a side of the conjoined rib (18) close to the pole shoe (4), and the second bending and giving way circular arc angle (17) is located on the other side of the conjoined rib (18) away from the pole shoe (4).

2. The stator straight iron core with positive and negative bending according to claim 1, characterized in that: Semicircular concave-convex guiding and positioning parts (8) are provided at the ends of two adjacent connecting pairs of oblique sides (3) of the two stator cores.

3. The stator straight iron core with positive and negative bending according to claim 2, characterized in that: The semicircular concave-convex guiding and positioning portion (8) comprises a semicircular arc groove (81) fixedly opened at the end of one connecting pair of bevels (3) and a semicircular arc convex block (82) fixedly arranged at the end of the other connecting pair of bevels (3), wherein the semicircular arc convex block (82) matches the semicircular arc groove (81).

4. The stator straight iron core with positive and negative bending according to claim 1, characterized in that: The end surface of the core yoke (1) is provided with a first rivet point (6) for stamping the laminated sheets, and the end surface of the core tooth (2) is provided with a second rivet point (7) for stamping the laminated sheets; The number of the first rivet points (6) is two, the two first rivet points (6) are symmetrically distributed on the end faces of the core yoke (1) on both sides of the central axis of the core yoke (1), and the second rivet point (7) is located at the center of the end face of the core tooth portion (2).

5. The stator straight iron core with positive and negative bending according to claim 1, characterized in that: The number of stator core segments is four, and the included angle between two connecting pairs of oblique sides (3) connected to the same connecting rib (18) is 90 degrees.

6. The stator straight iron core with positive and negative bending according to claim 1, characterized in that: The number of stator core segments is eight, and the included angle between two connecting pairs of oblique sides (3) connected to the same connecting rib (18) is 45 degrees.

7. A motor stator structure, characterized in that: It comprises the stator straight iron core as claimed in any one of claims 1 to 6, an insulating frame mounted on the stator straight iron core, and a winding coil (40) wound on the frame.

8. The motor stator structure according to claim 7, characterized in that: The insulating frame comprises a front frame (20) and a rear frame (30); The rear frame (30) comprises an insulating arc-shaped wire slot baffle (11) abutting against the pole shoe (4), an insulating plug plate (12) inserted in the core slot between the core yoke (1) and the pole shoe (4), an insulating end plate (13) fixedly connected to the insulating arc-shaped wire slot baffle (11) and the insulating plug plate (12) in the core slot, a wire slot plane baffle (16) fixedly connected to one end of the insulating plug plate (12) in the core slot and flush with the insulating end plate (13), a circular power lead pin column (14) fixed to the wire slot plane baffle (16), a circular bridge blocking column fixed to the wire slot plane baffle (16) and located on both sides of the circular power lead pin column (14), and a wire hanging column (15) with a groove fixed vertically to the wire slot plane baffle (16).

9. The motor stator structure according to claim 8, characterized in that: The two outermost circular bridge blocking posts on the rear frame (30) are solid cylinders, the circular power lead pin posts (14) are hollow cylinders, the ends of the circular power lead pin posts (14) are provided with pin holes for connecting the power lead to the winding coil, and the wire hanging posts (15) are arranged at intervals between adjacent circular power lead pin posts (14).

10. The motor stator structure according to claim 8, characterized in that: The front frame (20) and the rear frame (30) have the same structure.

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