Rotor and stator for winding type electric tool

Abstract

The utility model belongs to the technical field of rotors and stators, and particularly relates to a rotor and stator used on a winding type electric tool, which comprises a stator iron core, a rotor iron core is arranged in the stator iron core, the inner wall of the rotor iron core is fixedly connected with a rotating shaft, and the inner wall of the rotating shaft is fixedly connected with a motor. The right side of the stator core is fixedly connected with a first connecting column, and the right side of the first connecting column is fixedly connected with a hollow disc. According to the rotor and stator used on the winding type electric tool, through cooperation of a hollow disc, a sliding groove, a trapezoidal clamping block, a strip-shaped hole, a positioning column and a pressing cylinder, after the rotor and stator are fixed in a motor shell, the pressing cylinder pushes the trapezoidal clamping block leftwards through an end cover on the motor shell, the trapezoidal clamping block is inserted between a left limiting ring and a right limiting ring, and at the moment, the pressing cylinder pushes the trapezoidal clamping block leftwards; through cooperation of the trapezoidal clamping block, the limiting ring and the first cylinder, the rotor iron core on the rotor and stator can be positioned, and the position of the rotor iron core does not shift in the rotation process.

Description

Technical Field

[0001] This utility model belongs to the field of rotor and stator technology, specifically relating to a rotor and stator used in wound-rotor power tools. Background Technology

[0002] Power tools are indispensable tools in modern industrial and household maintenance. There are many types of power tools, mainly including metal cutting power tools such as electric drills, which can drill holes in materials of different strengths; grinding power tools such as electric grinders and electric grinders, which are used for sanding operations; and assembly power tools such as electric wrenches and electric screwdrivers, which facilitate the assembly and disassembly of threaded connections.

[0003] In power tools, the rotor and stator are one of the core components. The rotor rotates at high speed inside the stator to achieve the various functions of the power tool. However, in existing power tools, the rotor may experience positional misalignment during high-speed rotation. This not only affects the performance and stability of the power tool but may also damage the motor and shorten the tool's lifespan. Utility Model Content

[0004] The purpose of this invention is to provide a rotor-stator for wound-rotor power tools, which solves the problem that the rotor may shift position during high-speed rotation in existing power tools.

[0005] The specific technical solution adopted by this utility model is as follows:

[0006] A stator for a wound-rotor power tool includes a stator core, a rotor core disposed inside the stator core, a rotating shaft fixedly connected to the inner wall of the rotor core, a first connecting post fixedly connected to the right side of the stator core, a hollow disc fixedly connected to the right side of the first connecting post, a groove formed on the inner wall of the hollow disc, a trapezoidal locking block fitted against the inner wall of the groove, a slotted hole formed inside the trapezoidal locking block, a positioning post fitted against the inner wall of the slotted hole, the right side of the positioning post connected to the left side of the hollow disc, a first cylinder fixedly connected to the surface of the rotor core, the side of the trapezoidal locking block near the rotating shaft fitted against the inner wall of the first cylinder, limit rings fitted against both sides of the trapezoidal locking block, the inner walls of the limit rings fixedly connected to the surface of the first cylinder, and pressing cylinders fitted against the right side of the trapezoidal locking block and the surface of the rotating shaft.

[0007] The present invention is further configured such that the pressing cylinder includes a second cylinder, a second connecting post, a ring, a steel ball, a third cylinder, and an annular groove. One end of the second connecting post is fixedly connected to the inner wall of the second cylinder, and the other end of the second connecting post is fixedly connected to the surface of the ring. The inner wall of the ring fits against the inner wall of the steel ball. The annular groove is formed on the surface of the third cylinder, and the inner wall of the annular groove fits against the surface of the steel ball. The inner wall of the third cylinder fits against the surface of the rotating shaft. The left side of the second cylinder fits against the right side of the trapezoidal block.

[0008] The present invention is further configured such that the axis of the second cylinder coincides with the axis of the third cylinder.

[0009] The present invention is further configured such that a stator winding is installed inside the stator core, and a permanent magnet is installed inside the rotor core.

[0010] The present invention is further configured such that a threaded ring is fixedly connected to the right side of the second cylinder, and a threaded cylinder is threadedly connected to the inner wall of the threaded ring, the surface of the threaded cylinder being in contact with the inner wall of the second cylinder.

[0011] The present invention is further configured such that a locking nut is threadedly connected to the surface of the threaded cylinder, and the left side of the locking nut is in contact with the left side of the threaded ring.

[0012] The technical effects achieved by this utility model are as follows:

[0013] This utility model discloses a rotor-stator for wound-rotor power tools. Through the cooperation of a hollow disc, a sliding groove, a trapezoidal locking block, a strip hole, a positioning post, and a pressing cylinder, the rotor-stator is fixed inside the motor housing. The pressing cylinder pushes the trapezoidal locking block to the left through the end cover on the motor housing, causing the trapezoidal locking block to insert between the left and right limiting rings. At this time, through the cooperation of the trapezoidal locking block, the limiting rings, and the first cylinder, the rotor core on the rotor-stator can be positioned, thereby preventing the rotor core from shifting its position during rotation, thus improving the performance and stability of the power tool.

[0014] This utility model discloses a rotor / stator for a wound-rotor power tool. By incorporating a threaded ring and a threaded cylinder, when the distance between the motor end cover and the hollow disc is too large, the position of the threaded cylinder can be changed by rotating it. Adjusting the position of the threaded cylinder allows the second cylinder on the pressing cylinder to properly press the trapezoidal locking block. Through the cooperation of the threaded ring and the threaded cylinder, the rotor / stator can be adapted to different installation conditions. Furthermore, after the position of the threaded cylinder is adjusted, rotating the locking nut on the threaded cylinder ensures tight contact between the locking nut and the threaded ring, preventing the threaded cylinder from easily rotating. This ensures that the position of the threaded cylinder is not easily changed during use. Attached Figure Description

[0015] Figure 1 This is a three-dimensional schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a left view of the structure of this utility model;

[0017] Figure 3 yes Figure 1 Sectional view at point AA;

[0018] Figure 4 yes Figure 3 Enlarged view at point B in the middle;

[0019] Figure 5 This is a left view of the hollow disc in this utility model;

[0020] Figure 6 This is a front view of the first cylinder in this utility model;

[0021] Figure 7 This is a left view of the pressing bracket in this utility model;

[0022] Figure 8 yes Figure 7 Sectional view at CC;

[0023] Figure 9 This is a front view of the third cylinder in this utility model.

[0024] The attached diagram lists the components represented by each number as follows:

[0025] 1. Stator core; 2. Rotor core; 3. Shaft; 4. First connecting post; 5. Hollow disc; 6. Slide groove; 7. Trapezoidal locking block; 8. Strip hole; 9. Positioning post; 10. First cylinder; 11. Limiting ring; 12. Pressing cylinder; 121. Second cylinder; 122. Second connecting post; 123. Circular ring; 124. Steel ball; 125. Third cylinder; 126. Annular groove; 13. Stator winding; 14. Permanent magnet; 15. Threaded ring; 16. Threaded cylinder; 17. Locking nut. Detailed Implementation

[0026] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0027] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0028] like Figures 1 to 9 As shown, a stator for a wound-rotor power tool includes a stator core 1, a rotor core 2 disposed inside the stator core 1, a rotating shaft 3 fixedly connected to the inner wall of the rotor core 2, a first connecting post 4 fixedly connected to the right side of the stator core 1, a hollow disc 5 fixedly connected to the right side of the first connecting post 4, a groove 6 formed on the inner wall of the hollow disc 5, a trapezoidal locking block 7 fitted into the inner wall of the groove 6, a slotted hole 8 formed inside the trapezoidal locking block 7, and a positioning post 9 fitted into the inner wall of the slotted hole 8 for positioning. The right side of column 9 is connected to the left side of hollow disc 5. The surface of rotor core 2 is fixedly connected to the first cylinder 10. The side of trapezoidal block 7 near the rotating shaft 3 is attached to the inner wall of the first cylinder 10. Limiting rings 11 are attached to both the left and right sides of trapezoidal block 7. The inner wall of the limiting ring 11 is fixedly connected to the surface of the first cylinder 10. Pressing cylinders 12 are attached to both the right side of trapezoidal block 7 and the surface of rotating shaft 3. Stator winding 13 is installed inside stator core 1. Permanent magnet 14 is installed inside rotor core 2.

[0029] The pressing cylinder 12 includes a second cylinder 121, a second connecting post 122, a ring 123, a steel ball 124, a third cylinder 125, and an annular groove 126. One end of the second connecting post 122 is fixedly connected to the inner wall of the second cylinder 121, and the other end of the second connecting post 122 is fixedly connected to the surface of the ring 123. The inner wall of the ring 123 fits against the inner wall of the steel ball 124. The annular groove 126 is formed on the surface of the third cylinder 125. The inner wall of the annular groove 126 fits against the surface of the steel ball 124. The inner wall of the third cylinder 125 fits against the surface of the rotating shaft 3. The left side of the second cylinder 121 fits against the right side of the trapezoidal block 7. The axis of the second cylinder 121 coincides with the axis of the third cylinder 125.

[0030] It should be noted that, through the cooperation of the positioning post 9 and the strip hole 8, the trapezoidal locking block 7 can only move within the slide groove 6. The contact surface between the trapezoidal locking block 7 and the second cylinder 121 is an inclined surface. After the rotor and stator are fixed in the motor housing, the end cover on the motor housing pushes the second cylinder 121 to the left to push the trapezoidal locking block 7. Through the inclined surface on the trapezoidal locking block 7, the trapezoidal locking block 7 is inserted between the left and right limiting rings 11. At this time, through the cooperation of the trapezoidal locking block 7, the limiting rings 11 and the first cylinder 10, the rotor core 2 on the rotor and stator can be positioned. Through the cooperation of the ring 123, the steel ball 124 and the annular groove 126, the third cylinder 125 can rotate with the rotating shaft 3, thereby effectively reducing the wear between the pressing cylinder 12 and the rotating shaft 3.

[0031] like Figures 1 to 3As shown, a threaded ring 15 is fixedly connected to the right side of the second cylinder 121, and a threaded cylinder 16 is threadedly connected to the inner wall of the threaded ring 15. The surface of the threaded cylinder 16 is in contact with the inner wall of the second cylinder 121, and a locking nut 17 is threadedly connected to the surface of the threaded cylinder 16. The left side of the locking nut 17 is in contact with the left side of the threaded ring 15.

[0032] It should be noted that when the distance between the motor end cover and the hollow disc 5 is too large, the position of the threaded cylinder 16 can be changed by rotating the threaded cylinder 16. By adjusting the position of the threaded cylinder 16, the second cylinder 121 on the pressing cylinder 12 can press the trapezoidal block 7 normally. In this way, through the cooperation of the threaded ring 15 and the threaded cylinder 16, the rotor and stator can be adapted to different installation conditions. At the same time, after the position of the threaded cylinder 16 is adjusted, the locking nut 17 on the threaded cylinder 16 is rotated to make the locking nut 17 and the threaded ring 15 in tight contact. The locking nut 17 will prevent the threaded cylinder 16 from rotating easily, so that the position of the threaded cylinder 16 is not easily changed during the use of the rotor and stator.

[0033] During installation, the stator core 1 is first fixed inside the motor housing. Then, the rotor core 2 is installed inside the stator core 1, and the pressing cylinder 12 is placed on the rotating shaft 3. Next, the motor end cover is fixed to the motor housing. At this time, the second cylinder 121 is pushed to the left by the motor end cover to push the trapezoidal block 7. The trapezoidal block 7 is inserted between the left and right limiting rings 11 by the inclined surface on the trapezoidal block 7. At this time, the rotor core 2 on the stator can be positioned by the cooperation of the trapezoidal block 7, the limiting rings 11 and the first cylinder 10, and the position of the rotor core 2 will not be offset during rotation.

[0034] When it is necessary to disassemble the rotor core 2, first remove the motor end cover from the motor housing, then drive the pressing cylinder 12 from the rotating shaft 3, and move the trapezoidal block 7 to separate the trapezoidal block 7 from the limiting ring 11. At this time, the rotor core 2 can be disassembled from the motor housing.

[0035] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, shall be implemented using conventional methods in the field.

Claims

1. A rotor-stator for use in wound-rotor power tools, characterized in that: The system includes a stator core (1), inside which a rotor core (2) is disposed. A rotating shaft (3) is fixedly connected to the inner wall of the rotor core (2). A first connecting post (4) is fixedly connected to the right side of the stator core (1). A hollow disc (5) is fixedly connected to the right side of the first connecting post (4). A sliding groove (6) is provided on the inner wall of the hollow disc (5). A trapezoidal locking block (7) is fitted to the inner wall of the sliding groove (6). A strip hole (8) is provided inside the trapezoidal locking block (7). The inner wall of the strip hole (8) is fitted to the inner wall of the trapezoidal locking block (7). A positioning post (9) is provided, the right side of which is connected to the left side of the hollow disc (5). A first cylinder (10) is fixedly connected to the surface of the rotor core (2). The trapezoidal block (7) is close to the inner wall of the first cylinder (10) on the side near the rotating shaft (3). Limiting rings (11) are attached to both the left and right sides of the trapezoidal block (7). The inner wall of the limiting ring (11) is fixedly connected to the surface of the first cylinder (10). A pressing cylinder (12) is attached to both the right side of the trapezoidal block (7) and the surface of the rotating shaft (3).

2. A rotor-stator for a wound-rotor power tool according to claim 1, characterized in that: The pressing cylinder (12) includes a second cylinder (121), a second connecting post (122), a ring (123), a steel ball (124), a third cylinder (125), and an annular groove (126). One end of the second connecting post (122) is fixedly connected to the inner wall of the second cylinder (121), and the other end of the second connecting post (122) is fixedly connected to the surface of the ring (123). The inner wall of the ring (123) is in contact with the inner wall of the steel ball (124). The annular groove (126) is opened on the surface of the third cylinder (125). The inner wall of the annular groove (126) is in contact with the surface of the steel ball (124). The inner wall of the third cylinder (125) is in contact with the surface of the rotating shaft (3). The left side of the second cylinder (121) is in contact with the right side of the trapezoidal block (7).

3. A rotor-stator for a wound-rotor power tool according to claim 2, characterized in that: The axis of the second cylinder (121) coincides with the axis of the third cylinder (125).

4. A rotor-stator for a wound-rotor power tool according to claim 1, characterized in that: The stator core (1) is equipped with a stator winding (13), and the rotor core (2) is equipped with a permanent magnet (14).

5. A rotor-stator for a wound-rotor power tool according to claim 2, characterized in that: A threaded ring (15) is fixedly connected to the right side of the second cylinder (121), and a threaded cylinder (16) is threadedly connected to the inner wall of the threaded ring (15), with the surface of the threaded cylinder (16) fitting against the inner wall of the second cylinder (121).

6. A rotor-stator for a wound-rotor power tool according to claim 5, characterized in that: The threaded cylinder (16) is threaded with a locking nut (17), and the left side of the locking nut (17) is in contact with the left side of the threaded ring (15).

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