Permanent magnet motor stator

Abstract

The present invention discloses a permanent magnet motor stator, comprising a stator core, windings wound around the teeth on the inner side of the stator core, and a wiring structure for connecting the winding lead wires to a power line. The wiring structure comprises an upper insulating frame fixed to the top of the stator core, a wiring plate fixed to the upper insulating frame and having a center hole, and wiring terminals distributed on the wiring plate for welding one-to-one with the winding lead wires. The stator core winding lead wires are bent toward the surface of the wiring plate and then welded one-to-one with the wiring terminals arranged on the inner circumference of the wiring plate. The wiring structure of the stator of the present invention makes it easier to weld the winding lead wires and the wiring terminals, making the stator as a whole easier to manufacture, lowering production costs, and increasing production efficiency.

Description

Technical Field

[0001] The invention relates to a permanent magnet motor stator. Background Art

[0002] The stator of a known permanent magnet motor generally comprises a stator core, windings wound around the teeth of the stator core, and a wiring structure for connecting the winding lead wires to the power line. The wiring structure is further subdivided into an insulating frame fixed to one end of the core, a terminal block arranged on the insulating frame, and a number of terminal blocks distributed on the terminal block for welding the winding lead wires one by one.

[0003] However, in the existing permanent magnet motor stator wiring structure, the direction of the winding lead wire is usually parallel to the stator axis, and the corresponding terminal blocks on the wiring board are often distributed on the periphery of the wiring board and arranged perpendicular to the end face of the wiring board. This brings about the following series of problems:

[0004] 1) The terminal block needs to be raised to accommodate the winding lead wires, which makes the stator longer and larger, and the structure less compact.

[0005] 2) The welding of the winding lead wires and the terminal blocks is usually done by left and right spot welding. However, the existing left and right spot welding equipment has a complex structure, is inconvenient to operate, and has low production efficiency.

[0006] 3) The winding lead wires of the above-mentioned permanent magnet motor stator are often located at the outermost periphery of the iron core. In addition, they are parallel to the stator axis. This results in a large spacing between the winding lead wires, which not only makes the structure uncompact, but also brings inconvenience to spot welding. Summary of the Invention

[0007] The purpose of the present invention is to provide a permanent magnet motor stator, in which the winding lead wires and the connection terminals in the connection structure are easier to weld, making the stator as a whole easier to manufacture, lowering the production cost and improving the production efficiency.

[0008] The technical solution of the present invention is: a permanent magnet motor stator, including a stator core, windings wound around the teeth on the inner side of the stator core, and a wiring structure for connecting the winding lead wires to a power line, the wiring structure including an upper insulating frame fixed to the top of the stator core, a wiring disk fixed to the upper insulating frame and having a center hole, and wiring terminals distributed on the wiring disk for welding to the winding lead wires one by one; the characteristic is that the winding lead wires of the stator core are all bent toward the surface of the wiring disk and then welded to the wiring terminals arranged on the inner circumference of the wiring disk.

[0009] Furthermore, the bent section of the winding lead wire in the present invention is a horizontal section parallel to the surface of the terminal block, and the spot welding at the connection between the horizontal section and the terminal is upper and lower spot welding, and the spot welding direction is parallel to the axis of the stator core.

[0010] Furthermore, the terminal block of the present invention is provided with a U-shaped foot for supporting the winding lead wire. As in the prior art, the terminal block is actually made of a copper bar or copper sheet, the front end of which is folded up and a notch is cut out to form the U-shaped foot for positioning the winding lead wire.

[0011] Furthermore, the winding lead wires in the present invention are enameled copper wires.

[0012] Furthermore, the present invention includes a Hall circuit board and multiple Hall elements electrically connected thereto. The Hall circuit board is fixed to the top of a wiring board via screws, while the Hall elements are fixed to the bottom of the Hall circuit board and located inside the stator core via connecting brackets. The wiring board is provided with bracket through-holes for the connecting brackets to pass through. As in the prior art, when the present invention is combined with a rotor to form a permanent magnet motor, the Hall elements are used to detect rotor position to achieve electromagnetic commutation.

[0013] Furthermore, the stator core described in the present invention is a segmented stator core formed by splicing a plurality of core unit blocks in a ring shape, each core unit block includes an outer yoke portion and the tooth portion connected to the yoke portion as a whole, and two adjacent core unit blocks on the circumference are spliced together by a keyway structure provided on the corresponding yoke portion.

[0014] Furthermore, a lower insulating frame is fixed to the bottom of the stator core in the present invention.

[0015] The advantages of the present invention are:

[0016] 1) In the present invention, the winding lead wires are bent toward the surface of the terminal block, rather than being arranged parallel to the stator axis. This can greatly reduce the positioning height of the terminal block itself, shorten the overall length of the stator, reduce the volume, and make the structure more compact.

[0017] 2) The winding lead wires in the present invention can be connected to the terminal blocks on the inner circumference of the terminal plate by top and bottom spot welding after being bent. Compared with the left and right spot welding equipment, the known top and bottom spot welding equipment has a simpler structure and is more convenient to operate, which can effectively improve production efficiency.

[0018] 3) Compared with the prior art, the wiring terminals on the wiring board of the present invention are spaced apart with a small width and a short distance, which not only makes the structure compact but also facilitates spot welding.

[0019] In summary, the present invention has a simple and compact structure, and the winding lead wires and the terminal blocks in its wiring structure are easier to weld, making the stator as a whole easier to manufacture, with lower production costs and higher production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0021] Figure 1 A top view of a specific embodiment of the present invention (with the Hall circuit board removed);

[0022] Figure 2 for Figure 1 AA cross-section of

[0023] Figure 3 for Figure 1 Isolated front view of the stator core in an embodiment.

[0024] Among them: 1. Stator core; 2. Winding lead wire; 3. Upper insulation frame; 4. Terminal block; 4a. Bracket through-hole; 5. Terminal block; 5a. U-shaped clip; 6. Hall circuit board; 7. Hall element; 8. Connecting bracket; 9. Core unit block; 10. Yoke; 10a. Key; 10b. Groove; 11. Tooth; 12. Lower insulation frame. DETAILED DESCRIPTION

[0025] Example: The following combination Figures 1 to 3 The specific implementation of the permanent magnet motor stator provided by the present invention is described as follows:

[0026] The stator of this permanent magnet motor is similar to conventional technology. Its overall structure consists of a stator core 1, windings wound on the teeth 11 inside the stator core 1, a wiring structure for connecting the winding lead wires 2 to the power line, and a Hall element. The stator core 1 in this embodiment is a segmented stator core formed by annular splicing of twelve core unit blocks 9. Each core unit block 9 is composed of an outer yoke portion 10 and a tooth portion 11 connected to the yoke portion 10. Figure 3 As shown, a key 10a and a groove 10b matching the key 10a are respectively provided on both sides of the yoke part 10 of each core unit block 9, and two adjacent core unit blocks 9 on the circumference are spliced by the cooperation of the above-mentioned key 10a and groove 10b on the corresponding yoke part 10.

[0027] Recombination Figure 1 and Figure 2 As shown, the top and bottom of the stator core 1 are respectively covered with plastic and fixed with an upper insulating frame 3 and a lower insulating frame 12.

[0028] Since each core unit block 9 is provided with a winding on the tooth portion 11 ( Figure 3 Omitted), both ends of each winding serve as winding lead wires, which need to be connected to the power line of the permanent magnet motor. To this end, the wiring structure is composed of an upper insulating frame 3 fixed to the top of the stator core 1 by plastic molding, a wiring disk 4 fixed to the upper insulating frame 3 by screws and having a center hole, and wiring terminals 5 distributed on the wiring disk 4 for welding one by one with the winding lead wires 2. The specific improvement of the present invention is that the winding lead wires 2 of the stator core 1 are all bent toward the surface of the wiring disk 4 and are welded one by one with the wiring terminals 5 arranged on the inner circumference of the wiring disk 4, as shown in the figure. Figure 1 and Figure 2 shown.

[0029] And specifically Figure 2 As shown, the bent section of the winding lead wire 2 in this embodiment is a horizontal section parallel to the surface of the terminal block 4, and the spot welding at the connection between the horizontal section and the terminal 5 is upper and lower spot welding, and the spot welding direction is parallel to the axis of the stator core 1.

[0030] In this embodiment, the terminal block 5 is provided with a U-shaped foot 5a for supporting the winding lead wire 2. As in the prior art, the terminal block 5 is a copper bar with its front end folded and notched to form the U-shaped foot 5a, which is used to position the winding lead wire 2, which is an enameled copper wire.

[0031] Recombination Figure 1 and Figure 2 As shown, the Hall assembly in this embodiment is composed of a Hall circuit board 6, three Hall elements 7 electrically connected thereto, and corresponding connecting brackets 8, as in the known art. Figure 2 As shown, the Hall circuit board 6 is fixed to the top of the wiring board 4 by screws (omitted in the figure), and each Hall element 7 is fixed to the bottom of the Hall circuit board 6 and located inside the stator core 1 by connecting brackets 8. The wiring board 4 is provided with bracket through-holes 4a for the connecting brackets 8 to pass through. Figure 1 shown.

[0032] Through the above improvements, the present invention brings the following advantages:

[0033] 1) In the present invention, the winding lead wires 2 are all bent toward the surface of the terminal plate 4, rather than being arranged parallel to the stator axis. This can greatly reduce the positioning height of the terminal plate 4 itself, shortening the overall length of the stator, reducing the volume, and making the structure more compact.

[0034] 2) The winding lead wire 2 in the present invention can be connected to the terminal 5 on the inner circumference of the terminal plate 4 by top and bottom spot welding after being bent. Compared with the welding equipment of left and right spot welding, the known top and bottom spot welding equipment has a simpler structure and is more convenient to operate, which can effectively improve production efficiency.

[0035] 3) Compared with the prior art, the connection terminals 5 on the connection board 4 of the present invention have a smaller spacing width and a closer distance, which not only makes the structure compact but also facilitates spot welding.

[0036] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the present invention and implement it accordingly. They are not intended to limit the scope of protection of the present invention. Any modifications made within the spirit of the main technical solution of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A permanent magnet motor stator, comprising a stator core (1), a winding wound on each tooth portion (11) inside the stator core (1), and a wiring structure for connecting a winding lead wire (2) to a power line, the wiring structure comprising an upper insulating frame (3) fixed to the top of the stator core (1), a wiring plate (4) fixed to the upper insulating frame (3) and having a center hole, and wiring terminals (5) distributed on the wiring plate (4) for welding one by one with the winding lead wire (2); characterized in that The winding lead wires (2) of the stator core (1) are all bent toward the surface of the wiring disk (4) and then welded to the wiring terminals (5) arranged on the inner circumference of the wiring disk (4); The bent section of the winding lead wire (2) is a horizontal section parallel to the surface of the wiring plate (4), and the spot welding at the connection between the horizontal section and the wiring terminal (5) is an upper and lower spot welding, and the spot welding direction is parallel to the axis of the stator core (1); The device further comprises a Hall circuit board (6) and a plurality of Hall elements (7) electrically connected thereto. The Hall circuit board (6) is fixed to the top of the wiring board (4) by screws, and each Hall element (7) is fixed to the bottom of the Hall circuit board (6) and located inside the stator core (1) by a connecting bracket (8). The wiring board (4) is provided with a bracket through-hole (4a) for the connecting bracket (8) to pass through.

2. The permanent magnet motor stator according to claim 1, characterized in that The connection terminal (5) is provided with a U-shaped clamping foot (5a) for supporting the winding lead wire (2).

3. The permanent magnet motor stator according to claim 1 or 2, characterized in that The wiring terminal (5) is a copper bar or a copper sheet.

4. The permanent magnet motor stator according to claim 1, characterized in that The winding lead wire (2) is an enameled copper wire.

5. The permanent magnet motor stator according to claim 1, characterized in that The stator core (1) is a segmented stator core formed by annularly splicing a plurality of core unit blocks (9), each core unit block (9) comprising a peripheral yoke portion (10) and a tooth portion (11) integrally connected to the yoke portion (10), and two adjacent core unit blocks (9) on the circumference are spliced together by means of a keyway structure provided on the corresponding yoke portion (10).

6. The permanent magnet motor stator according to claim 1, characterized in that A lower insulating frame (12) is fixed to the bottom of the stator core (1).

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