Motor in electric hand drill

Abstract

The utility model provides a motor in an electric hand drill, which comprises a motor body composed of a stator body and a rotor body, and further comprises a limiting assembly used for enabling the stator body and the rotor body to be located at the same axis when the stator body and the rotor body are installed, the limiting ring is arranged at one end, close to a rotor body, of a stator body, the limiting rods are arranged at one end, close to the stator body, of the rotor body, and limiting grooves matched with the limiting rods are formed in the limiting ring; according to the utility model, the motor body composed of the stator body and the rotor body and the limiting assembly are arranged, and the limiting assembly is used for limiting deviation generated by strong magnetic force attraction when the rotor body moves towards the center of the stator body; therefore, unnecessary friction loss generated between the gear at the bearing at one end of the rotor body and the rotating shaft of the electric hand drill is reduced, the service life of the electric hand drill is prolonged, and a part of potential safety hazards are eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a motor in a hand electric drill. Background Art

[0002] A hand drill is a drilling tool powered by an AC power supply or a DC battery and is a type of handheld power tool.

[0003] In existing hand drills, a 4182-type rotor motor is generally used as the output motor of the hand drill. The battery-powered motor converts electrical energy into kinetic energy to provide a strong rotational force for the hand drill. However, during assembly, this type of motor has a strong magnetic force between the stator and the rotor. When one end of the rotor passes through the center of the rotor, the strong magnetic force causes the centers of the rotor and the stator to be off-axis. The slight deviation will cause increased gear wear on the shaft and motor bearings of the hand drill, thus affecting the service life of the hand drill.

[0004] The above content is only used to assist in understanding the technical solution of the present invention and does not mean that the above content is the closest prior art. Utility Model Content

[0005] The purpose of the utility model is to solve the above-mentioned deficiencies and provide a motor for an electric hand drill.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solution: the motor in the hand electric drill includes a motor body composed of a stator body and a rotor body, and also includes:

[0007] The limiting assembly is used to ensure that the stator body and the rotor body are on the same axis during installation. It includes a limiting ring arranged on the stator body near one end of the rotor body and multiple limiting rods arranged on the rotor body near one end of the stator body. The limiting ring is provided with limiting grooves that are compatible with the limiting rods.

[0008] Furthermore, a plurality of circular copper sheets are fixedly provided on a side surface of the limiting ring close to the rotor body, and each of the copper sheets is arranged tilted.

[0009] Furthermore, the limiting rod is circular and fixedly arranged on a side surface of the rotor body, and a rotating rod is rotatably arranged on one end of the limiting rod close to the stator body, and both the rotating rod and the limiting rod are adapted to the limiting slot.

[0010] Furthermore, the stator body comprises a stator bracket, a plurality of frames arranged on the inner side wall of the stator bracket, and a stator silicon steel sheet fixedly arranged on the outer side wall of the stator bracket, and the outer side wall of the frame is wound with copper wire.

[0011] Furthermore, the diameter of the stator bracket is 45 mm and its height is 24 mm, the number of the skeleton is 6 groups, the copper wire is 200-grade 0.85 mm pure copper enameled wire, the copper wire is wound 16 times around the skeleton, and the diameter of the stator silicon steel sheet is 48 mm.

[0012] Furthermore, the rotor body is composed of a built-in magnet, a rotor bracket fixedly arranged at one end of the built-in magnet, and a rotor silicon steel sheet fixedly arranged on an outer side wall of the rotor bracket.

[0013] Furthermore, the diameter of the rotor silicon steel sheet is 47 mm.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] By providing a motor body consisting of a stator body and a rotor body and a limit assembly, the limit assembly limits the deviation of the rotor body caused by strong magnetic attraction when it moves toward the center of the stator body, thereby reducing unnecessary friction loss between the gear at the bearing at one end of the rotor body and the hand drill shaft, thereby extending the service life of the hand drill and eliminating some safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0018] Figure 2 This is a schematic diagram of the assembly structure of an embodiment of the present utility model;

[0019] Figure 3 This is a schematic structural diagram of a limiting ring and a copper sheet in one embodiment of the present utility model;

[0020] Figure 4 This is a structural diagram of a stator bracket and a frame in one embodiment of the present utility model;

[0021] Figure 5 This is a schematic structural diagram of the rotor bracket and rotor silicon steel sheets in one embodiment of the present invention.

[0022] In the figure: 1. Motor body; 101. Stator body; 1011. Stator bracket; 1012. Skeleton; 1013. Copper wire; 1014. Stator silicon steel sheet; 102. Rotor body; 1021. Built-in magnet; 1022. Rotor bracket; 1023. Rotor silicon steel sheet; 2. Limiting assembly; 201. Limiting ring; 2011. Limiting groove; 202. Copper sheet; 203. Limiting rod; 2031. Rotating rod. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. In the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0025] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or schemes in which A and B are satisfied at the same time. In addition, "multiple" refers to more than two. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0026] See also Figure 1-5 .

[0027] The utility model provides a technical solution for a motor in an electric hand drill: the motor in the electric hand drill includes a motor body 1 composed of a stator body 101 and a rotor body 102, and also includes: a limiting assembly 2, which is used to ensure that the stator body 101 and the rotor body 102 are on the same axis during installation, and includes a limiting ring 201 arranged on the stator body 101 near one end of the rotor body 102 and a plurality of limiting rods 203 arranged on the rotor body 102 near one end of the stator body 101, and a limiting groove 2011 adapted to the limiting rod 203 is opened on the limiting ring 201.

[0028] By providing a motor body 1 consisting of a stator body 101 and a rotor body 102 and a limit assembly 2, the limit assembly 2 limits the deviation of the rotor body 102 caused by strong magnetic attraction when it moves toward the center of the stator body 101, thereby reducing unnecessary friction loss between the gear at the bearing at one end of the rotor body 102 and the hand drill shaft, thereby extending the service life of the hand drill and eliminating some safety hazards.

[0029] In one embodiment, a plurality of circular copper sheets 202 are fixedly provided on a side surface of the limiting ring 201 close to the rotor body 102, and a single copper sheet 202 is arranged at an angle. A rotating rod 2031 is rotatably provided on one end of the limiting rod 203 close to the stator body 101, and both the rotating rod 2031 and the limiting rod 203 are adapted to the limiting groove 2011.

[0030] With this design, when installing the motor of the hand drill, first move one end of the rotor body 102 closer to the stator body 101. When one end of the rotor body 102 passes through the center of the stator body 101, since the inner wall of the stator body 101 and the outer wall of the rotor body 102 are both provided with strong magnets, this will cause the rotor body 102 to be adsorbed toward the side wall of the stator body 101. At this time, by aligning one end of the limiting rod 203 with the limiting groove 2011 provided on the limiting ring 201 on the limiting assembly 2, the rotating rod 2031 and the limiting rod 203 are inserted into the limiting groove 2011. Due to the limiting groove 2011 The width is adapted to the rotating rod 2031 and the limiting rod 203, which can ensure that the rotor body 102 and the stator body 101 remain on the same axis. The outer wall of the rotating rod 2031 will contact the inner wall of the limiting groove 2011, and since the rotating rod 2031 and the limiting rod 203 are rotatably connected, when the rotor body 102 rotates, the rotating rod 2031 will also rotate in the limiting groove 2011. The single copper sheet 202 is arranged at an angle. When the rotor body 102 rotates, the circular copper sheet 202 as a whole will drive the air inside and outside the stator body 101 to circulate, thereby increasing the heat dissipation effect.

[0031] In one embodiment, the stator body 101 includes a stator bracket 1011, a plurality of skeletons 1012 arranged on the inner wall of the stator bracket 1011, and a stator silicon steel sheet 1014 fixedly arranged on the outer wall of the stator bracket 1011. The outer wall of the skeleton 1012 is wound with copper wire 1013. The diameter of the stator bracket 1011 is 45 mm and its height is 24 mm. The number of skeletons 1012 is 6 groups. The copper wire 1013 is 200 grade 0.85 mm pure copper enameled wire. The copper wire 1013 is wound around the skeleton 1012 16 times. The diameter of the stator silicon steel sheet 1014 is 48 mm.

[0032] With this design, due to the design changes to the stator bracket 1011 and the skeleton 1012, the 48mm stator silicon steel sheets 1014 are stacked to 20mm, resulting in the copper wire 1013 turns on the stator body 101 increasing by 5-10mm per group of skeletons 1012, and the increase for 6 groups is (5 to 10)*6 times; when the current remains unchanged, the frequency of the coil change and the area of ​​the waveform of the stator body 101 increase, and the area of ​​the alternating magnetic field formed around the stator body 101 increases.

[0033] In one embodiment, the rotor body 102 is composed of an internal magnet 1021, a rotor bracket 1022 fixedly arranged at one end of the internal magnet 1021, and a rotor silicon steel sheet 1023 fixedly arranged on the outer wall of the rotor bracket 1022. The diameter of the rotor silicon steel sheet 1023 is 47 mm.

[0034] With this design, the area of ​​the permanent magnet driving the rotor body 102 to rotate is also increased, and the speed and torque output to the gear box through the rotor body 102 are also greater.

[0035] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced within the present invention.

Claims

1. A motor in a hand drill, comprising a motor body (1) consisting of a stator body (101) and a rotor body (102), characterized in that: Also included are: The limiting assembly (2) is used to ensure that the stator body (101) and the rotor body (102) are aligned with the same axis during installation, and comprises a limiting ring (201) arranged on the stator body (101) near one end of the rotor body (102) and a plurality of limiting rods (203) arranged on the rotor body (102) near one end of the stator body (101), wherein the limiting ring (201) is provided with limiting grooves (2011) adapted to the limiting rods (203).

2. The motor in the hand drill according to claim 1, characterized in that: A plurality of circular copper sheets (202) are fixedly arranged on a side surface of the limiting ring (201) close to the rotor body (102), and each of the copper sheets (202) is arranged in an inclined manner.

3. The motor in the hand drill according to claim 2, characterized in that: A rotating rod (2031) is rotatably provided at one end of the limiting rod (203) close to the stator body (101), and both the rotating rod (2031) and the limiting rod (203) are adapted to the limiting slot (2011).

4. The motor in the hand drill according to claim 3, characterized in that: The stator body (101) comprises a stator bracket (1011), a plurality of skeletons (1012) arranged on the inner side wall of the stator bracket (1011), and stator silicon steel sheets (1014) fixedly arranged on the outer side wall of the stator bracket (1011), wherein the outer side wall of the skeleton (1012) is wound with a copper wire (1013).

5. The motor in the hand drill according to claim 4, characterized in that: The stator bracket (1011) has a diameter of 45 mm and a height of 24 mm, the number of the skeletons (1012) is 6 groups, the copper wire (1013) is a 200-grade 0.85 mm pure copper enameled wire, the copper wire (1013) is wound around the skeleton (1012) 16 times, and the stator silicon steel sheet (1014) has a diameter of 48 mm.

6. The motor for the hand drill according to claim 5, characterized in that: The rotor body (102) is composed of a built-in magnet (1021), a rotor bracket (1022) fixedly arranged at one end of the built-in magnet (1021), and a rotor silicon steel sheet (1023) fixedly arranged on the outer side wall of the rotor bracket (1022).

7. The motor in the hand drill according to claim 6, characterized in that: The diameter of the rotor silicon steel sheet (1023) is 47 mm.

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