Closed-loop stepping motor and magnetic steel connector thereof

Abstract

The utility model discloses a closed loop stepping motor and a magnetic steel connector thereof. The magnetic steel connector is an injection molding piece formed by injection molding of a non-magnetic material and comprises a first shaft section and a second shaft section which are coaxially connected, a first assembly hole used for being connected with a rotating shaft of the closed-loop stepping motor in an inserted mode is formed in the first shaft section, and a second assembly hole used for assembling magnetic braided magnetic steel is formed in the second shaft section. Wherein the inner wall of the first assembly hole is provided with more than two arc-shaped grooves which are arranged in a circumferential array, and the arc-shaped grooves linearly extend from the bottom of the first assembly hole to the top of the first assembly hole; on the inner wall of the first assembly hole, the arc length between every two adjacent arc-shaped grooves is several times larger than the width of the arc-shaped grooves. According to the scheme of the invention, processing of an assembly hole in the end part of the motor rotating shaft can be avoided, the magnetic-braided magnetic steel can be more conveniently installed, the production efficiency can be improved, the cost can be reduced, motors of different specifications can be uniformly assembled with the magnetic-braided magnetic steel of the same specification and size, unified management is facilitated, and the efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of step motor, concretely relates to a closed loop step motor and its magnetic steel connector. BACKGROUND

[0002] Step motor is a kind of electric motor that converts electric pulse signal into corresponding angular displacement or linear displacement, and the rotor rotates an angle or moves forward one step for each input pulse signal, and the output angular displacement or linear displacement is proportional to the input pulse number, and the rotation speed is proportional to the pulse frequency.Step motor with position information feedback usually adds encoder to the tail of step motor to feedback the position information of step motor.Encoder includes magnetic steel and induction chip, and in the common encoder installation structure, the magnetic steel is assembled in the installation hole in the end of motor rotating shaft.This installation structure increases the processing difficulty and cost of shaft, and when the diameters of rotating shafts of different specifications of motors are different, different diameter magnetic steels are needed, which is not convenient for unified management. SUMMARY

[0003] Therefore, the utility model provides a closed loop step motor and its magnetic steel connector to solve the problem of how to install magnetic steel more conveniently to improve production efficiency and reduce cost.

[0004] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0005] A magnetic steel connector of a closed loop step motor, the magnetic steel connector is an injection molding part made of non-magnetic material, the magnetic steel connector includes coaxially connected first shaft section and second shaft section, a first assembly hole for inserting the rotating shaft of the closed loop step motor is arranged in the first shaft section, and a second assembly hole for assembling the magnetic steel is arranged in the second shaft section.

[0006] Wherein, two or more than two circular-arc grooves arranged in circumferential array are arranged on the inner wall of the first assembly hole, and the circular-arc grooves extend in a straight line from the bottom of the first assembly hole to the top of the first assembly hole;The arc length between adjacent two circular-arc grooves on the inner wall of the first assembly hole is more than several times the width of the circular-arc groove.

[0007] Preferably, 2-20 circular-arc grooves arranged in circumferential array are arranged on the inner wall of the first assembly hole.

[0008] Preferably, the depth of the circular-arc groove on the inner wall of the first assembly hole is 0.1mm-2mm.

[0009] Preferably, top edges of the first assembly hole and the second assembly hole are respectively provided as circular arc chamfer structures.

[0010] Preferably, the first assembly hole and the second assembly hole are in communication with each other.

[0011] Another aspect of the utility model provides a closed loop stepping motor, it includes the motor body with pivot, magnetic steel, drive circuit board, back cover and as above magnetic steel connector, the first end of pivot exposes from the rear end of motor body, the magnetic steel connector is connected to the first end of pivot through first assembly hole, the magnetic steel is assembled in second assembly hole, the back cover is connected to the rear end of motor body, drive circuit board is assembled in back cover, the position that drive circuit board is opposite with magnetic steel is provided with inductive chip.

[0012] The closed loop stepping motor and the magnetic steel connector thereof provided by the utility model embodiment, by adopting the injection molding piece of non-magnetic material injection molding as the magnetic steel connector, the magnetic steel connector includes coaxially connected first shaft section and second shaft section, the first assembly hole for being plugged with the pivot of the closed loop stepping motor is formed in the first shaft section, the second assembly hole for assembling the magnetic steel is formed in the second shaft section, the magnetic steel is connected to the end of the motor pivot through the magnetic steel connector, thereby the end of the motor pivot can be avoided to be processed and assembled, the magnetic steel is more conveniently installed, the production efficiency can be improved and the cost is reduced, different specifications of motors can be uniformly assembled with the same specification size of magnetic steel, the unified management is facilitated, and the efficiency is improved.

[0013] Further, two or more than two circular arc grooves in circumferential array are arranged on the inner wall of the first assembly hole, so that the inner wall of the first assembly hole has a certain deformation capacity, the end of the motor pivot is easily plugged into the magnetic steel connector, and the arc length between the adjacent two circular arc grooves is several times greater than the width of the circular arc groove, the motor pivot and the first assembly hole also have a large contact area, and the stability of connection is maintained. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the explosion diagram of the closed loop stepping motor in the utility model embodiment;

[0015] Figure 2 It is the perspective view of the magnetic steel connector in the utility model embodiment;

[0016] Figure 3 It is the top view of the magnetic steel connector in the utility model embodiment;

[0017] Figure 4 It is the bottom view of the magnetic steel connector in the utility model embodiment;

[0018] Figure 5 is a sectional view of the magnetic steel connector in the embodiment of the present application. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the present application clearer, the specific embodiments of the present application will be described in detail below with reference to the drawings. The examples of these preferred embodiments are illustrated in the drawings. The embodiments of the present application shown in the drawings and described according to the drawings are merely exemplary, and the present application is not limited to these embodiments.

[0020] It should be noted that the same or similar reference numerals in the drawings of the embodiments of the present application correspond to the same or similar components; in the description of the present application, it should be understood that if the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right" and the like are based on the orientations or positional relationships shown in the drawings, they are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, the terms describing the positional relationships in the drawings are only used for exemplary illustration, and cannot be understood as a limitation on the present patent, for those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0021] Here, it should also be noted that, in order to avoid obscuring the present application due to unnecessary details, only the structures and / or processing steps closely related to the scheme according to the present application are shown in the drawings, and other details not closely related to the present application are omitted.

[0022] The embodiment of the present application provides a magnetic steel connector and a closed-loop stepping motor comprising the same. Referring to Figure 1 , the closed-loop stepping motor mainly comprises a magnetic steel connector 1, a motor body 4 with a rotating shaft 2, a magnetic coding magnetic steel 3, a driving circuit board 5 and a rear cover 6. The first end of the rotating shaft 2 is exposed from the rear end of the motor body 4, the first end of the magnetic steel connector 1 is connected to the first end of the rotating shaft 2, the magnetic coding magnetic steel 3 is assembled at the second end of the magnetic steel connector 1, the rear cover 6 is connected to the rear end of the motor body 4, the driving circuit board 5 is assembled in the rear cover 6, and the driving circuit board 5 is provided with an inductive chip 7 at a position opposite to the magnetic coding magnetic steel 3.

[0023] Among them, the magnetic steel connector 1 is mainly used to connect the magnetic coding magnetic steel 3 to the rotating shaft 2. In the present embodiment, referring to Figures 2 to 5The magnetic steel connector 1 is an injection molding part made of non-magnetic material, and comprises a coaxially connected first shaft section 11 and a second shaft section 12. The first shaft section 11 is provided with a first assembly hole 13 for inserting the rotating shaft 2 of the closed-loop stepping motor, and the second shaft section 12 is provided with a second assembly hole 14 for assembling the magnetic steel 3. When assembling the magnetic steel 3, first, the magnetic steel connector 1 is inserted into the first end of the rotating shaft 2 through the first assembly hole 13, and then the magnetic steel 3 is assembled in the second assembly hole 14.

[0024] The inner wall of the first assembly hole 13 is provided with two or more circumferentially arranged arc-shaped grooves 15, which extend straight from the bottom of the first assembly hole 13 to the top of the first assembly hole 13. The arc length between adjacent two arc-shaped grooves 15 on the inner wall of the first assembly hole 13 is greater than the width of the arc-shaped groove 15.

[0025] The inner wall of the first assembly hole 13 is provided with two or more circumferentially arranged arc-shaped grooves 15, which extend straight from the bottom of the first assembly hole 13 to the top of the first assembly hole 13. The arc length between adjacent two arc-shaped grooves 15 on the inner wall of the first assembly hole 13 is greater than the width of the arc-shaped groove 15.

[0026] The depth of the arc-shaped groove 15 on the inner wall of the first assembly hole 13 can be set to 0.1mm-2mm, preferably 0.5mm-1.5mm.

[0027] Further, in the present embodiment, the first assembly hole 13 and the second assembly hole 14 are in communication with each other. The top edges of the first assembly hole 13 and the second assembly hole 14 are respectively provided with a circular arc chamfer structure.

[0028] Based on the above structure of the magnetic steel connector 1, by using an injection molding part made of non-magnetic material as the magnetic steel connector, the magnetic steel 3 is connected to the end of the rotating shaft 2 through the magnetic steel connector 1, thereby avoiding machining the assembly hole at the end of the rotating shaft 2, making it more convenient to install the magnetic steel 3, improving production efficiency and reducing cost, different specifications of motors can be uniformly assembled with the same specification size of magnetic steel 3, facilitating unified management and improving efficiency.

[0029] Further, the inner wall of the first assembly hole 13 for connecting with the rotating shaft 2 is provided with a plurality of circular-arc grooves 15 arranged in a circumferential array, the inner wall surface of the first assembly hole 13 is divided into a plurality of regions by the plurality of circular-arc grooves 15, so that the inner wall of the first assembly hole 13 has a certain deformation capacity, and the end of the rotating shaft 2 is easily inserted into the first assembly hole 13 during assembly, thereby improving production efficiency. Moreover, the arc length between two adjacent circular-arc grooves 15 is several times greater than the width of the circular-arc groove 15, so that the rotating shaft 2 and the first assembly hole 13 still have a large contact area after insertion, thereby maintaining the stability of the connection between the two.

[0030] Further, the circular-arc grooves 15 can also be used for ventilation and exhaust. After the magnetic steel connector 1 is connected to the end of the rotating shaft 2, and the magnetic encoding magnetic steel 3 is assembled again, since the magnetic encoding magnetic steel 3 is in interference fit with the second assembly hole 14, the air in the second assembly hole 14 can be exhausted from the circular-arc grooves 15, thereby making it easier to install the magnetic encoding magnetic steel 3.

[0031] In addition, in order to enable the rotating shaft 2 and the first assembly hole 13 to be firmly connected, in some processes, glue needs to be applied to the rotating shaft 2 when the two are connected, and in this case, overflow of the glue can occur when the rotating shaft 2 is inserted into the first assembly hole 13. However, the magnetic steel connector 1 of the present embodiment is provided with the circular-arc grooves 15, which can also be used as overflow grooves, thereby avoiding the glue from overflowing to the outside of the device and polluting the working environment during insertion, and being conducive to improving the product yield on the production line.

[0032] The above is only a specific embodiment of the present application, and it should be noted that for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A magnet connector for a closed loop stepper motor, comprising: The magnetic steel connector (1) is an injection molding part made of a non-magnetic material, comprising coaxially connected first shaft section (11) and second shaft section (12), the first shaft section (11) is provided with a first assembly hole (13) for inserting the shaft (2) of the closed loop stepping motor, the second shaft section (12) is provided with a second assembly hole (14) for assembling the magnetic steel (3); Wherein, the inner wall of the first assembly hole (13) is provided with two or more than two circular arc grooves (15) arranged in a circular array, the circular arc grooves (15) extend linearly from the bottom of the first assembly hole (13) to the top of the first assembly hole (13); on the inner wall of the first assembly hole (13), the arc length between adjacent two circular arc grooves (15) is greater than the width of the circular arc groove (15).

2. The magnet steel connector of claim 1, wherein The inner wall of the first assembly hole (13) is provided with 2-20 circular arc grooves (15) arranged in a circular array.

3. The magnet steel connector according to claim 1 or 2, characterized in that, The depth of the circular arc groove (15) on the inner wall of the first assembly hole (13) is 0.1-2mm.

4. The magnet steel connector of claim 1, wherein The top edge of the first assembly hole (13) and the second assembly hole (14) is respectively provided with a circular arc chamfer structure.

5. The magnet steel connector of claim 1 or 4, wherein The first assembly hole (13) and the second assembly hole (14) are communicated with each other.

6. A closed loop stepper motor characterized by, The motor body (4) comprising a shaft (2), a magnetic steel (3), a drive circuit board (5), a rear cover (6) and a magnetic steel connector (1) according to any one of claims 1-5; the first end of the shaft (2) is exposed from the rear end of the motor body (4), the magnetic steel connector (1) is connected to the first end of the shaft (2) through the first assembly hole (13), the magnetic steel (3) is assembled in the second assembly hole (14), the rear cover (6) is connected to the rear end of the motor body (4), the drive circuit board (5) is assembled in the rear cover (6), and the drive circuit board (5) is provided with an induction chip (7) opposite to the magnetic steel (3).

Images