CN221127065U

CN221127065U - Stator assembly, motor and impact wrench

Info

Publication number: CN221127065U
Application number: CN202322771832.0U
Authority: CN
Inventors: 李玲军
Original assignee: Yuyao Actuator Electric Motor Co ltd
Current assignee: Yuyao Actuator Electric Motor Co ltd
Priority date: 2023-10-16
Filing date: 2023-10-16
Publication date: 2024-06-11
Anticipated expiration: 2033-10-16

Abstract

The utility model provides a stator assembly, a motor and an impact wrench, wherein the stator assembly comprises a stator, a printed circuit board and a shielding sheet, the printed circuit board is arranged at one end of the stator, the shielding sheet is arranged between the stator and the printed circuit board, an electric connection part for conducting windings of the stator, a Hall sensor for detecting the position of a corresponding rotor assembly and a Hall switch for an inductive switch of the motor comprising the stator assembly are integrated on the printed circuit board, and the shielding sheet shields interference of electromagnetic fields generated by the windings on the Hall switch. The utility model can realize the miniaturization of the motor while realizing various functions of the motor.

Description

Stator assembly, motor and impact wrench

Technical Field

The present utility model relates to a stator assembly, a motor and an impact wrench, and more particularly, to a stator assembly having an integrated printed wiring board integrated with a plurality of functions, a motor including the stator assembly, and a brushless direct current impact wrench including the motor.

Background

Impact wrenches are a type of torque tool and can typically be driven by a motor. The stator assembly of a conventional impact wrench motor may include a connector and a hall printed circuit board (PCB board) disposed at the stator. The connector is connected to the stator by soldering, thereby achieving the circuit communication of the windings of the stator. The hall PCB is usually fixed on the stator by adding glue or other fixing means, thereby functioning to detect the rotor position of the motor.

However, the conventional impact wrench motor has the following drawbacks: the motor is large in size and cannot meet the requirements of miniaturization and compactness of the impact wrench; the motor has complex production process and low manufacturing efficiency; and a plurality of parts are required to complete a plurality of motor functions, so that the motor can not be light.

Disclosure of utility model

The present utility model has been made in view of the above-mentioned drawbacks of the prior art, and an object of the present utility model is to provide a stator assembly capable of achieving miniaturization of a motor while achieving various functions.

In order to achieve the above object, the present utility model provides a stator assembly including a stator, a printed wiring board mounted at one end of the stator, and a shielding sheet disposed between the stator and the printed wiring board, on which an electric connection portion for conducting windings of the stator, a hall sensor for detecting a position of a corresponding rotor assembly, and a hall switch for an induction switch of a motor including the stator assembly are integrated, the shielding sheet shielding an electromagnetic field generated by the windings from interfering with the hall switch.

Optionally, the printed wiring board is an annular board.

Optionally, the printed wiring board is formed with a plurality of recesses at an outer peripheral edge thereof, and the electrical connection portion is configured to be exposed from the plurality of recesses so as to be electrically connected with terminals of the corresponding winding.

Optionally, the hall sensor is disposed on a surface of the printed wiring board facing the stator.

Optionally, the hall switch is disposed on another surface of the printed wiring board remote from the stator.

Optionally, the hall switch falls entirely within the shield plate in a projection toward the shield plate in a direction perpendicular to the printed wiring board.

Optionally, the number of the hall sensors is 3, and the number of the hall switches is 4.

Optionally, the printed circuit board and the shielding sheet pass through the mounting hole of the printed circuit board and the mounting hole of the shielding sheet in turn by screws and enter the positioning column on the stator to be fixed on the stator.

The present utility model also provides an electric machine comprising an end cap, a rotor assembly and a stator assembly as described above.

The present utility model also provides an impact wrench including: a motor as described above; a gear mechanism connected to and driven by the motor; and a work device that is connected to the gear mechanism and performs a twisting work.

Compared with the prior art, the utility model has the beneficial effects that:

(1) The function of conducting the windings of the stator is realized through the integrated electric connection part on the integrated PCB, so that the single connector in the prior art is replaced, the size of the motor can be effectively reduced, the miniaturization and the light weight of the motor are realized, the use of the motor with higher assembly space requirements can be facilitated, and the higher requirements of customer space limitation are met.

(2) The Hall switch of the induction switch for the motor is additionally arranged on the integrated PCB while the motor is miniaturized and light, and the shielding sheet with the shielding function is also arranged, so that more functions can be realized to meet the requirements of customers, and the product competitiveness is improved.

(3) Through simply installing integrated form PCB board on the stator, reduced the assembly and the welding time of connector and the glue solid time of hall PCB board among the prior art, be favorable to simplifying the technology, improve production efficiency.

Drawings

Embodiments of the present utility model will be described below with reference to the accompanying drawings.

Fig. 1 is an exploded perspective view illustrating a stator assembly according to an embodiment of the present utility model.

Fig. 2A is a top view illustrating an integrated printed wiring board according to an embodiment of the present utility model; fig. 2B is a side view illustrating an integrated printed wiring board according to an embodiment of the present utility model; and

Fig. 2C is a bottom view illustrating an integrated printed wiring board according to an embodiment of the present utility model.

Fig. 3A is a perspective view showing an assembled state of an integrated printed wiring board according to an embodiment of the present utility model; fig. 3B is a side view showing an assembled state of the integrated printed wiring board according to an embodiment of the present utility model; and fig. 3C is an enlarged view of a portion a in fig. 3B.

Fig. 4 is a top view showing an assembled state of the shield blades according to the embodiment of the present utility model.

Reference numerals illustrate:

1. stator assembly

10 PCB (printed circuit board)

11. Hall switch

12. Hall sensor

13 Mounting hole of PCB

14. Recess (es)

15. Electric connection part

20. Shielding sheet

Mounting hole of 21 shielding sheet

30. Stator

31. Positioning column

32. Terminal for connecting a plurality of terminals

33. Winding

40. Screw bolt

Detailed Description

Hereinafter, specific embodiments of the present utility model will be described with reference to the accompanying drawings. In the drawings, the same or similar elements are denoted by the same or similar reference numerals. Furthermore, it is to be understood that the directions of up, down, left, right, etc. shown in the drawings and described throughout the present utility model are all illustrative and not restrictive.

One aspect of the present utility model provides a stator assembly 1, the stator assembly 1 comprising a stator 30 and a printed circuit board 10 (also referred to as an integrated PCB board or PCB board), an electrical connection 15 (see e.g. fig. 3C) for conducting a winding 33 (see fig. 4) of the stator 30, a hall sensor 12 for detecting the position of a corresponding rotor assembly (not shown), and a hall switch 11 for an inductive switch of an electric machine comprising the stator assembly 1, the stator assembly 1 further being provided with a shielding sheet 20 to shield an electromagnetic field generated by the winding 33 from interference with the hall switch 11.

As shown in fig. 1, 2A to 2C and 3A to 3C, in one embodiment of the present utility model, the PCB board 10 is an annular plate and is mounted at one end of the stator 30. The PCB board 10 is formed at an outer peripheral edge thereof with a plurality of recesses 14, and the electrical connection portion 15 may be configured to be exposed from the plurality of recesses 14 of the outer peripheral edge of the PCB board 10 so as to be electrically connected with the terminals 32 of the corresponding windings 33. Specifically, the electrical connection parts 15 may be configured as conductors embedded in the PCB board 10, each recess 14 of the PCB board 10 corresponds to a terminal 32 of the winding 33, and when the PCB board 10 is mounted on the stator 30, the electrical connection parts 15 exposed from the recesses 14 just contact with the corresponding terminal 32 (see fig. 3B and 3C), and then the electrical connection parts 15 are connected and fixed with the terminal 32 by applying soldering, thereby achieving a function of conducting a stator winding circuit. It should be understood that the connection manner of the electrical connection portion 15 and the winding terminal is not limited thereto as long as conduction of the winding circuit can be achieved. Compared with the prior art that a separate connector is arranged to realize the function of conducting a stator winding circuit, the PCB 10 integrated with the electric connection part 15 simplifies the assembly steps, saves the internal space of the motor, thereby effectively reducing the volume of the motor and realizing the miniaturization and the light weight of the motor.

In one embodiment of the present utility model, as shown in fig. 2B and 2C, the hall sensor 12 is disposed on the surface of the PCB board 10 facing the stator 30. The hall sensor 12 may detect a position of a rotor (not shown) corresponding to the stator 30.

In one embodiment of the present utility model, as shown in fig. 2A and 2B, the hall switch 11 is disposed on the other surface of the PCB board 10 remote from the stator 30. The hall switch 11 can realize the switch induction function of the motor corresponding to the stator assembly 1, so that the rotation speed of the motor can be controlled, and the torsion speed of the impact wrench can be controlled when the motor is applied to the impact wrench.

In one embodiment of the present utility model, the shielding sheet 20 is disposed between the stator 30 and the PCB board 10, and the projection of the hall switch 11 toward the shielding sheet 20 in the direction perpendicular to the PCB board 10 falls entirely into the shielding sheet 20. In other words, the shielding sheet 20 can completely shield the hall switch 11 from the magnetic field from the winding 33. The shielding sheet 20 may be a low-carbon shielding sheet. The shielding sheet 20 may be formed as a part of an annular plate, for example. As shown in fig. 4, the shield blades 20 may cover just after being mounted on the stator 30, two sets of windings 33 that may interfere with the hall switch 11. The outer peripheral edge of the shielding sheet 20 may be provided with, for example, two mounting holes 21. After the assembly of the shielding plate 20 is completed, the shielding plate 20 is just below the hall switch 11 (near the side of the stator 30) and plays a role of shielding the electromagnetic field of the winding corresponding to the position where the hall switch 11 is located. It should be understood that although the shielding sheet 20 is shown to shield two windings 33, the shielding sheet 20 may shield more or less windings 33 depending on the area of distribution of the hall switch 11. According to the utility model, the Hall switch for the induction switch of the motor is additionally arranged on the integrated PCB, and the shielding sheet with the shielding function is also arranged, so that more functions can be realized to meet the demands of customers, and the product competitiveness is improved.

In one embodiment of the present utility model, the number of hall sensors 12 is 3, and the number of hall switches 11 is 4. However, the number of hall sensors 12 and hall switches 11 is not limited thereto, and the number of hall sensors 12 and hall switches 11 may be reduced or increased according to actual needs. The hall sensors 12 may be arranged to be sequentially arranged along a portion of the circumferential direction of the ring-shaped PCB board 10. The hall sensors 11 may be arranged to be sequentially arranged along a part of the circumferential direction of the annular PCB board 10, and the hall sensors 11 are preferably arranged at positions not overlapping with the hall sensors 12. However, the arrangement of the hall sensor 12 and the hall switch 11 is not limited thereto.

In one embodiment of the present utility model, as shown in fig. 1 and 3, the PCB board 10 and the shielding sheet 20 are fixed to the stator 30 by screws 40 sequentially passing through the mounting holes 13 of the PCB board, the mounting holes 21 of the shielding sheet 20, and into the positioning posts 31 on the stator 30. More specifically, first, the mounting holes 21 of the shielding sheet 20 are aligned with the positioning posts 31 of the stator, and the shielding sheet 20 is quickly fixed to the positioning posts 31 using a hot riveting process; then aligning the mounting hole 13 of the PCB 10 on the positioning column 31, and connecting and fixing the electric connection part 15 and the terminal 32 through soldering; finally, the screws 40 are sequentially passed through the mounting holes 13, the mounting holes 21 and screwed into the screw holes in the positioning posts 31, thereby completing the fixation of the shielding plate 20 and the PCB board 10. Although the shielding plate is shown with two mounting holes 21, the number of mounting holes may be changed according to actual needs. Although the PCB board is shown with two mounting holes 13, the number of mounting holes may be varied according to actual needs. Compared with the mode that the PCB is fixed on the stator by applying glue, the PCB saves the time of waiting for the glue to solidify, is beneficial to simplifying the process and improves the production efficiency.

Another aspect of the utility model also provides an electric machine comprising an end cap, a rotor assembly and a stator assembly 1 as described above. The motor may be a brushless dc motor.

Yet another aspect of the present utility model provides an impact wrench including a motor as described above; a gear mechanism connected to and driven by the motor; and a work device that is connected to the gear mechanism and performs a twisting work. The impact wrench may be a brushless dc impact wrench.

By integrating the electric connection portion 15, the hall switch 11, and the hall sensor 12 on the PCB board 10 as described above, the motor can be miniaturized while realizing various functions of the motor, and thus a compact high-power brushless dc impact wrench integrating various functions can be manufactured.

It is to be understood that the above embodiments are merely illustrative of the application of the principles of the present utility model, but not in limitation thereof. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the utility model, and are also considered to be within the scope of the utility model.

Claims

1. The stator assembly is characterized by comprising a stator, a printed circuit board and a shielding sheet, wherein the printed circuit board is arranged at one end of the stator, the shielding sheet is arranged between the stator and the printed circuit board, and an electric connection part for conducting a winding of the stator, a Hall sensor for detecting the position of a corresponding rotor assembly and a Hall switch for an inductive switch of a motor comprising the stator assembly are integrated on the printed circuit board, and the shielding sheet shields electromagnetic fields generated by the winding from interfering the Hall switch.

2. The stator assembly of claim 1 wherein the printed wiring board is an annular plate.

3. The stator assembly according to claim 2, wherein the printed wiring board is formed at an outer peripheral edge thereof with a plurality of recesses, and the electrical connection portion is configured to be exposed from the plurality of recesses so as to be electrically connected with terminals of the corresponding winding.

4. The stator assembly of claim 2, wherein the hall sensor is disposed on a surface of the printed wiring board facing the stator.

5. The stator assembly of claim 2, wherein the hall switch is disposed on another surface of the printed wiring board remote from the stator.

6. The stator assembly of claim 5, wherein a projection of the hall switch toward the shield plate in a direction perpendicular to the printed wiring board falls entirely within the shield plate.

7. The stator assembly according to any one of claims 4 to 6, wherein the number of hall sensors is 3 and the number of hall switches is 4.

8. The stator assembly according to any one of claims 1 to 6, wherein the printed wiring board and the shielding sheet are fixed to the stator by screws sequentially passing through mounting holes of the printed wiring board, mounting holes of the shielding sheet, and into positioning posts on the stator.

9. An electric machine comprising an end cap, a rotor assembly and a stator assembly according to any preceding claim.

10. An impact wrench, the impact wrench comprising:

the electric machine of claim 9;

a gear mechanism connected to and driven by the motor; and

And a work device which is connected to the gear mechanism and performs a twisting work.