CN214124985U

CN214124985U - Electric connector, motor with electric connector and power tool

Info

Publication number: CN214124985U
Application number: CN202022872546.XU
Authority: CN
Inventors: 徐勇辉; 黄伟梁; 何剑维
Original assignee: Techtronic Cordless GP
Current assignee: Techtronic Cordless GP
Priority date: 2020-12-04
Filing date: 2020-12-04
Publication date: 2021-09-03
Anticipated expiration: 2030-12-04

Abstract

The utility model discloses an electric connector, motor and power tool that has this electric connector. The electrical connector (1) for electrically connecting lead wires (31, 32) of a stator coil (30) of an electrical machine (10) to a circuit board, characterized in that the electrical connector (1) is an L-shaped plate and comprises a vertical portion and a horizontal portion perpendicular to each other, wherein the vertical portion extends in an axial direction of the electrical machine (10) and has a first electrical connection (11) at a vertical free end, the first electrical connection (11) being for electrical connection to the circuit board, and wherein the horizontal portion has a second electrical connection (12) at a horizontal free end and a fixing portion (13) adjacent to the vertical portion, the second electrical connection (12) being for electrical connection to the lead wires (31, 32), the fixing portion (13) being for fixing the electrical connector (1) to a support (21), the support (21) is located at an end of a stator (20) of the electrical machine (10).

Description

Electric connector, motor with electric connector and power tool

Technical Field

The present invention relates generally to an electrical connector, and more particularly to an electrical connector for use in an electrical machine for establishing an electrical connection between a lead wire of a stator coil and a circuit board. The utility model discloses still relate to the motor that has this electric connector and have the power tool of this motor.

Background

Miniaturization and high power output have been the direction of efforts of technicians in various fields where electrical machines (including motors and generators) are used. The high power output means that the motor must use wires of thicker wire diameter to make the coils, so that the overall size of the motor must be increased accordingly. Therefore, the miniaturization and high power output of the motor tend to be contradictory.

In some applications such as power tools, it is desirable to shorten the longitudinal length of the power tool in order to be able to function properly with limited operating space. One solution to shorten power tools is to arrange the motor laterally, for example in a laterally extending handle. However, this arrangement necessarily adds complexity to the drive train since the motor shaft is not coaxial with the power tool spindle. Another solution is to reduce the axial size of the motor, but the wire diameter and the number of turns of the coil are often difficult to reduce due to the power (torque) requirements.

Fig. 1 shows an electrical connection 1 from the prior art for electrically connecting the

leads

31, 32 of the stator coils of an electric machine to a circuit board 2. The electric connector 1 is a substantially rectangular metal plate material, and includes a first electric connection portion 11, a second electric connection portion 12, and a fixing portion 13 in this order along the axial direction of the motor. The first electrical connection portion 11 is used to electrically connect (e.g., solder) to the circuit board 2. The second electrical connection portion 12 may be one hook portion that protrudes outward from the electrical connector body, and serves to receive and electrically connect (e.g., weld) the

lead wires

31, 32 of the two stator coils therein. The fixing portion 13 is used to fix the electrical connector 1 to a stator (not shown) of an electric motor.

In the electrical connector 1, the first electrical connection portion 11 and the second electrical connection portion 12 are arranged in the axial direction while the two leads 31, 32 are stacked in the axial direction, and a large axial space is occupied in the case where the lead wire diameter is large.

Meanwhile, since the first and second

electrical connection portions

11, 12 are short in distance, deformation/oxidation caused at the second electrical connection portion 12 when, for example, the

leads

31, 32 are soldered will be transmitted to the vicinity of the first electrical connection portion 11, thereby affecting soldering and positioning between the first electrical connection portion 11 and the circuit board 2.

Therefore, there is a need in the art for an electrical connector that has a reduced axial dimension and two solder portions that do not interfere with each other when soldered. In addition, there is a need in the art for a motor and power tool that has a reduced axial dimension and maintains a constant output power (torque).

SUMMERY OF THE UTILITY MODEL

In one aspect, the present invention provides an electrical connector for electrically connecting a lead wire of a stator coil of an electric machine to a circuit board, characterized in that the electrical connector is an L-shaped plate and comprises a vertical portion and a horizontal portion perpendicular to each other, wherein the vertical portion extends in an axial direction of the electric machine and has a first electrical connection at a vertical free end for electrical connection to the circuit board, and wherein the horizontal portion has a second electrical connection at a horizontal free end and a fixing portion adjacent to the vertical portion for electrical connection to the lead wire, the fixing portion being for fixing the electrical connector to a support located at an end of a stator of the electric machine.

In the above-described electric connector, the first electric connection portion and the second electric connection portion are separated by the fixing portion therebetween, and therefore deformation or oxidation at the second electric connection portion is not transmitted to the first electric connection portion when the lead is electrically connected (e.g., soldered). This ensures a smooth electrical connection (e.g., soldering) and good positioning between the first electrical connection portion and the circuit board.

Meanwhile, since the first and second electrical connection portions are arranged at the free ends of the vertical portion and the horizontal portion, respectively, the two will have a larger arrangement space in the axial direction without interfering with each other. Accordingly, the axial dimension of the electrical connector is shortened, and the axial dimension of the entire motor and the power tool incorporating the motor (particularly, the electric motor) is correspondingly shortened.

Preferably, the second electrical connection includes two or more terminals spaced apart from each other along the horizontal portion for receiving respective two or more of the leads.

Since the terminals for receiving the lead wires are spaced apart from each other in the horizontal direction, a plurality of lead wires overlapping each other in the axial direction in the related art may be arranged in the horizontal direction (circumferential direction) in the present invention. Therefore, the axial dimension is distributed in the horizontal direction, so that the axial dimension of the electric connecting piece is further shortened under the condition that the diameter of the lead wire is thick, and the axial dimension of the whole motor and the power tool is further reduced.

Preferably, the two or more terminals are hooks protruding outward from the horizontal portion. Advantageously, the hook portion is formed by bending a part of the horizontal portion outwardly. Alternatively, the two or more terminals are receptacles or sockets for leads.

Preferably, the horizontal portion has a space between adjacent ones of the two or more terminals for the lead wire to pass through.

Preferably, the electrical connection member is bent or curved in a circumferential direction of the motor to follow a circumferential profile of the motor. Advantageously, the electrical connector has a first bent portion between the vertical portion and the fixing portion, and a second bent portion between the fixing portion and the second electrical connection portion.

Preferably, the first electrical connection is soldered to the circuit board. Alternatively or additionally, the first electrical connection is plugged into a corresponding socket of the circuit board.

Preferably, the lead is soldered to the second electrical connection portion. Alternatively, the lead wire is electrically connected to the second electrical connection portion by screwing, riveting, snapping, plugging, or the like.

Preferably, the electrical connection portion is a one-piece metal plate. The metal plate material is, for example, an aluminum plate, a copper plate, or a steel plate. Advantageously, the electrical connection is formed by pressing (e.g. stamping) the sheet metal material.

In another aspect, the present invention provides an electric machine, comprising: a rotor; a stator including a stator coil; a circuit board; a plurality of electric connectors according to the invention, fixed to a support located at the end of the stator and electrically connecting the lead wires of the stator coils to the circuit board.

Preferably, the stator further comprises an insulating bracket for receiving an end portion of the stator coil, wherein the holder is integrally formed with the insulating bracket.

Preferably, the fixing portion of the electrical connector is overmolded in the seat. Alternatively, the horizontal portion of the electrical connector is mechanically connected (e.g., threaded, snapped, etc.) to the mount.

Preferably, the number of stator coils is six and/or the number of electrical connectors is three.

Preferably, the electric machine is an electric motor or a generator.

In a further aspect, the present invention provides a power tool, characterized in that the power tool comprises a motor according to the present invention, the motor being an electric motor.

According to the utility model discloses an axial dimension that electric connector arouses the thick lead wire of axial stack shifts to the horizontal direction (circumference direction) on to the whole axial dimension of motor has been shortened effectively, and has shortened the whole axial dimension of the power tool who adopts this motor (especially motor) from this.

Drawings

The invention is specifically illustrated by way of example in the accompanying drawings, in which:

FIG. 1 shows a schematic view of a prior art electrical connector;

figure 2 shows a perspective view of an electrical connector according to the present invention;

figure 3 shows a top view of an electrical connector according to the invention;

fig. 4 shows a schematic view of the connection between the electrical connector and the lead wire of the stator coil according to the invention; and is

Fig. 5 shows a partial schematic view of an electric machine according to the invention.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

According to the present invention, the term "vertical portion" or "vertical direction" substantially corresponds to the axial direction of the electric machine, and the term "horizontal portion" or "horizontal direction" substantially corresponds to the circumferential direction of the electric machine or to a direction tangential to the circumferential direction.

Fig. 2 and 3 show a perspective view and a plan view, respectively, of an electrical connector according to the invention, and fig. 4 shows a schematic view of the connection between the electrical connector and the lead wires of the stator coil.

Referring to fig. 2 to 4, the electric connector 1 is an L-shaped sheet metal member for electrically connecting the

lead wires

31, 32 of the stator coil 30 of the motor 10 to a circuit board (not shown). The vertical part of the L-shaped sheet metal element extends substantially in the axial direction of the electric machine 10 and has a first electrical connection 11 at its free end. The first electrical connection 11 is soldered to the circuit board or plugged into a corresponding socket of the circuit board. The horizontal portion of the L-shaped sheet metal element extends substantially along the circumferential portion of the electric machine 10 and has a second electrical connection 12 and a fixing portion 13. The second electrical connection portion 12 is located at the free end of the horizontal portion and receives a plurality of

lead wires

31, 32 of the stator coil 30. The fixing portion 13 is located between the vertical portion and the second electrical connection portion 12 and fixes the electrical connector 1 to the stator 20 of the electrical machine 10, in particular to a support 21 located at the end of the stator 20. The second electrical connection portion 12 may be flush with the fixing portion 13 in the axial direction or project slightly upwards with respect to the latter to achieve a larger axial space for receiving the lead wires, as shown in fig. 2.

The second electrical connection portion 12 includes two terminal ends 121, 122 spaced apart from each other in the horizontal direction, the terminal ends 121, 122 being hook portions protruding radially outward from the horizontal portion. The hook portion may be formed by bending a portion of the horizontal portion outward, for example, by cutting or punching. The

terminals

121, 122 may also be formed by means of sockets, receptacles, etc. for leads, and/or the

leads

31, 32 may be electrically connected to the

terminals

121, 122 by means of screwing, riveting, snapping, plugging, etc. A gap 123 is left between the two

terminals

121, 122. The lead wire 31 from the coil 30 passes through the gap 123 from the radially inner side of the electric connector 1, and then is bent to the left in fig. 4 to be received in the terminal 121. The other lead wire 32 from the coil 30 is passed around the free end of the horizontal portion from the radially inner side of the electric connector 1 and then bent also leftward to be received in the other terminal 122. The two

terminals

121, 122 are spaced apart by such a distance that the two leads 31, 32 received do not overlap each other, in particular in the axial direction.

An example in which the two leads 31, 32 are bent in the same direction (left direction) and received is shown in fig. 4. However, one skilled in the art can envision that the two leads 31, 32 could be bent in opposite directions. For example, both leads 31, 32 may pass through the void 123 of the electrical connector 1, and then one of the leads 31 is bent to the left to be received by the terminal 31, and the other lead 32 is bent to the right to be received by the terminal 32. This arrangement also achieves the object that the two leads 31, 32 do not overlap each other. In addition, two terminals and two leads are shown, however, one skilled in the art may envision a greater number of terminals and corresponding number of leads. The term "lead wire" as referred to in the present invention refers to one or two (or more) wires from the stator coil, depending on the connection of the stator coil, and these connections are well known to those skilled in the art of electrical machines. For example, two wires from the same or different stator coils may be connected as one lead to the electrical connector and thus to the circuit board.

As shown in fig. 3, the electric connector 1 is bent in the circumferential direction of the motor 10, thereby forming a first bent portion 14 between the vertical portion and the fixed portion 13 of the horizontal portion, and forming a second bent portion 15 between the fixed portion 13 of the horizontal portion and the second electric connection portion 12. A person skilled in the art can envisage the electrical connector 1 having more bends. The bent electrical connector 1 substantially follows the circumferential contour of the electrical machine 10. Alternatively, the electric connector 1 may be integrally bent with a curvature in the circumferential direction. The curvature may correspond to the curvature of the stator housing.

Fig. 5 shows a partial schematic view of the electric machine 10 according to the invention. The motor 10 includes a stator 20, a rotor (not shown), and a circuit board (not shown). The stator 20 includes a stator housing 23, a plurality of stator coils 30 (six stator coils 30 are shown in the drawing) located radially inside the stator housing 23, and an insulating bracket 22 for receiving end portions of the stator coils 30. A plurality of electric connectors 1 (three electric connectors 1 are shown in the drawing) are fixed to the mount 21 at the end of the stator 20, and lead wires of the stator coil 30 are electrically connected to the circuit board. The support 21 is formed integrally with the insulating support 22. The electric connector 1 is fixed to the support 21 by its fixing portion 13. The fixing portion 13 may be overmolded in the seat 21 or fixed to the seat 21 by means of a screw connection, snap fit or the like.

The electrical machine 10 according to the present invention may be an electric motor or a generator. The motor may be used in a power tool.

According to the utility model discloses, through the position of rearranging two electric connections and solved electric connector's heat altered shape and location problem, shortened electric connector axial dimensions simultaneously, and then shortened motor and power tool's total axial dimensions.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. Electrical connector (1) for electrically connecting leads (31, 32) of a stator coil (30) of an electrical machine (10) to a circuit board, characterized in that the electrical connector (1) is an L-shaped plate and comprises a vertical part and a horizontal part which are perpendicular to each other,

wherein the vertical portion extends in an axial direction of the electric machine (10) and has a first electrical connection (11) at a vertical free end, the first electrical connection (11) being for electrical connection to the circuit board, and

wherein the horizontal portion has a second electrical connection (12) at a horizontal free end, the second electrical connection (12) being for electrical connection to the leads (31, 32), and a fixing portion (13) adjacent the vertical portion, the fixing portion (13) being for fixing the electrical connector (1) to a support (21), the support (21) being located at an end of a stator (20) of the electrical machine (10).

2. Electrical connection according to claim 1, characterized in that said second electrical connection (12) comprises two or more terminals (121, 122) spaced from each other along said horizontal portion for receiving respective two or more of said leads (31, 32).

3. Electrical connection according to claim 2, characterized in that said two or more terminals (121, 122) are hooks projecting outwards from said horizontal portion.

4. Electrical connection according to claim 2, characterized in that said horizontal portion has a gap (123) between adjacent terminals of said two or more terminals (121, 122) for the passage of said leads (31, 32).

5. Electrical connection according to any of claims 1 to 4, characterized in that said electrical connection (1) is bent or curved along a circumferential direction of said electric machine (10) so as to follow a circumferential profile of said electric machine (10).

6. Electrical connection according to any one of claims 1 to 4, characterized in that the first electrical connection (11) is soldered to the circuit board and/or the leads (31, 32) are soldered to the second electrical connection (12).

7. An electric machine (10), characterized in that the electric machine (10) comprises:

a rotor;

a stator (20) including a stator coil (30);

a circuit board;

a plurality of electrical connectors (1) according to any of claims 1 to 6, the electrical connectors (1) being fixed to a support (21) at the end of the stator (20) and electrically connecting the leads (31, 32) of the stator coils (30) to the circuit board.

8. The machine according to claim 7, wherein the stator (20) further comprises an insulating bracket (22) for receiving an end portion of the stator coil (30), wherein the seat (21) is integrally formed with the insulating bracket (22).

9. The machine according to claim 7 or 8, characterized in that the fixing portion (13) of the electrical connector (1) is overmoulded in the seat (21).

10. A power tool, characterized in that it comprises a motor (10) according to any one of claims 7-9, which motor is an electric motor.