Stator assembly and installation method thereof, stepper motor

Abstract

The present invention provides a stator assembly, a mounting method thereof, and a stepper motor, wherein the stator assembly includes a mounting bracket, a drive coil winding disposed on both sides of the mounting bracket, and a plurality of electrode sheets disposed on both sides of the mounting bracket, wherein at least two drive coil windings are disposed on one side of the mounting bracket, and each of the drive coil windings is correspondingly provided with at least two electrode sheets, wherein the electrode sheets include an excitation portion and a pole claw portion, and the drive coil winding is disposed around the excitation portion, and the pole claw portions of the electrode sheets corresponding to the same drive coil winding are alternately distributed along the circumferential direction. The stator assembly, the mounting method thereof, and the stepper motor of the present invention reduce the number of pole claw portions required for excitation of each drive coil winding by arranging a plurality of drive coil windings on each side, thereby shortening the magnetic circuit, reducing the magnetic resistance, and improving the utilization efficiency of the magnetic field.

Description

Technical Field

[0001] The invention relates to the technical field of motors, and in particular to a stator assembly and a mounting method thereof, and a stepping motor. Background Art

[0002] The existing stepper motor includes two sets of coil windings and pole plates that generate a magnetic field by exciting the coil windings. The pole plates are provided with multiple pole claws. Therefore, one coil winding needs to excite multiple pole claws, which will make the magnetic circuit longer, the magnetic resistance greater, and the magnetic field utilization efficiency lower.

[0003] In view of this, it is necessary to improve the existing stator assembly to solve the above problems. Summary of the invention

[0004] The object of the present invention is to provide a stator assembly to solve the problem of low magnetic field utilization efficiency caused by too many excitation pole claws of coil windings in the existing stator assembly.

[0005] To achieve the above-mentioned purpose, the present invention provides a stator assembly, which includes a mounting bracket, a drive coil winding arranged on both sides of the mounting bracket, and a plurality of electrode sheets arranged on both sides of the mounting bracket. At least two drive coil windings are arranged on one side of the mounting bracket, and each drive coil winding is correspondingly provided with at least two electrode sheets, and the electrode sheet includes an excitation part and a pole claw part. The drive coil winding is arranged around the excitation part, and the pole claw parts of the electrode sheet corresponding to the same drive coil winding are alternately distributed along the circumferential direction.

[0006] As a further improvement of the present invention, the mounting bracket is made of non-magnetic conductive material, and the electrode sheet is made of magnetic conductive material.

[0007] As a further improvement of the present invention, the drive coil windings on the same side of the mounting bracket are arranged in a circular array.

[0008] As a further improvement of the present invention, the mounting bracket is provided with a plurality of mounting parts on both sides, and the drive coil winding is arranged around the mounting parts and the excitation parts.

[0009] As a further improvement of the present invention, the mounting portion is formed with a clamping groove, and the excitation portion is axially inserted into the clamping groove.

[0010] As a further improvement of the present invention, the electrode sheet further comprises a connecting portion connecting the excitation portion and one end of the pole claw portion, and positioning portions for positioning the connecting portion are formed on both side surfaces of the mounting bracket.

[0011] As a further improvement of the present invention, each of the driving coil windings is provided with two electrode sheets, which are respectively a first electrode sheet and a second electrode sheet. The first electrode sheet has a first pole claw portion, and the second electrode sheet has two second pole claw portions. The first pole claw portion is inserted between the two second pole claw portions.

[0012] As a further improvement of the present invention, the first pole claw portion and the second pole claw portion corresponding to the same drive coil winding extend in opposite directions, and the first pole claw portions corresponding to two adjacent drive coil windings extend in opposite directions.

[0013] As a further improvement of the present invention, the first electrode sheet has a first excitation portion, the second electrode sheet has a second excitation portion, and the first excitation portion abuts against the second excitation portion.

[0014] As a further improvement of the present invention, the drive coil windings on the same side of the mounting bracket are electrically connected and the current directions are the same.

[0015] The present invention also provides a stepper motor, which comprises the stator assembly as described above.

[0016] The present invention also provides a method for installing the stator assembly as described above, and the method for installing the stator assembly comprises the following steps:

[0017] S1: Alternately install the first electrode sheets and the second electrode sheets on one side on the mounting bracket so that the corresponding first excitation parts and the second excitation parts are inserted into the holding slots;

[0018] S2: Winding the wire around the mounting portion to form a drive coil winding;

[0019] S3: inserting the first excitation part and the second excitation part of the first electrode sheet and the second electrode sheet into the holding groove from the side away from the mounting bracket;

[0020] S4: repeat steps S1-S3 to complete the installation of the first electrode sheet, the second electrode sheet and the driving coil winding on the other side of the mounting bracket;

[0021] S5: Overmolding to form a stator assembly.

[0022] The beneficial effects of the present invention are as follows: the stator assembly and its installation method, and the stepper motor of the present invention reduce the number of pole claws required for excitation of each drive coil winding by arranging multiple drive coil windings on each side, thereby shortening the magnetic circuit, reducing magnetic resistance, and improving the utilization efficiency of the magnetic field. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0024] Figure 1 It is a structural schematic diagram of a stepping motor of the present invention;

[0025] Figure 2 It is a schematic diagram of the exploded structure of the stepping motor of the present invention;

[0026] Figure 3 yes Figure 2 A schematic diagram of the enlarged structure of the middle area A;

[0027] Figure 4 is a schematic structural diagram of a first electrode sheet of a stator assembly of the present invention;

[0028] Figure 5 is a schematic structural diagram of a second electrode sheet of a stator assembly of the present invention;

[0029] Figure 6 It is a structural schematic diagram of a mounting bracket of a stepping motor of the present invention;

[0030] Figure 7 is a schematic diagram of the structure obtained in step S1 of the stepping motor installation method of the present invention;

[0031] Figure 8 is a schematic structural diagram obtained in step S2 of the stepping motor installation method of the present invention;

[0032] Fig. 9 It is a structural schematic diagram obtained in step S3 of the stepping motor installation method of the present invention.

[0033] Figure numerals: 100, stepper motor; 10, stator assembly; 1, mounting bracket; 11, mounting portion; 12, clamping groove; 13, receiving groove; 2, driving coil winding; 3, electrode sheet; 31, excitation portion; 32, pole claw portion; 33, connecting portion; 34, first electrode sheet; 341, first excitation portion; 342, first pole claw portion; 343, first connecting portion; 35, second electrode sheet; 351, second excitation portion; 352, second pole claw portion; 353, second connecting portion; 4, plastic package. DETAILED DESCRIPTION

[0034] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0037] like Figures 1 to 9 As shown, the stepper motor 100 of the present invention includes a stator assembly 10. The stator assembly 10 can be arranged around the rotor assembly to drive the rotor assembly to rotate, thereby achieving power output.

[0038] The stator assembly 10 includes a mounting bracket 1 , a driving coil winding 2 arranged on both sides of the mounting bracket 1 , a plurality of electrode sheets 3 arranged on both sides of the mounting bracket 1 , and a plastic package 4 .

[0039] The overmolded body 4 covers the mounting bracket 1 , the driving coil winding 2 and the electrode sheet 3 by injection molding.

[0040] At least two drive coil windings 2 are provided on one side of the mounting bracket 1, that is, the drive coil windings 2 on each side are arranged in a plurality, so that each drive coil winding 2 forms its own closed loop. Compared with the large closed magnetic circuit of an existing drive coil winding, the magnetic circuit is shortened, thereby reducing the magnetic resistance and leakage flux, thereby improving the working efficiency of the stepper motor 100. At the same time, such an arrangement can also reduce the total material usage and reduce material costs.

[0041] The number of the drive coil windings 2 is an even number, for example, the number can be 2, 4, 6, 8, 10, 12, 14, etc., which can be increased or decreased according to the power output of the motor. In the present embodiment, 8 drive coil windings 2 are provided on each side, and the drive coil windings 2 on the same side of the mounting bracket 1 are electrically connected, which can be in series or in parallel, but it should be ensured that the current rotation direction of the drive coil windings 2 on the same side is the same. Furthermore, in the present embodiment, the drive coil windings 2 on the same side are formed by winding with the same metal wire. Of course, in other embodiments, they can also be wound independently and then electrically connected by connecting wires. The above two embodiments can ensure the consistency of the magnitude and direction of the current.

[0042] Each of the driving coil windings 2 is provided with at least two electrode sheets 3. In this embodiment, each of the driving coil windings 2 is provided with two electrode sheets 3. In other embodiments, it can also be arranged so that one driving coil winding 2 corresponds to more than two electrode sheets 3. However, since there are multiple driving coil windings 2, the number of electrode sheets 3 corresponding to each driving coil winding 2 can be adjusted according to the number of required pole claws.

[0043] In addition, in order to ensure the consistency of the excitation effect, the number of electrode sheets 3 corresponding to each of the driving coil windings 2 is equal. For example, in this embodiment, each of the driving coil windings 2 is provided with two electrode sheets 3. In this embodiment, the driving coil windings 2 are made of copper wire.

[0044] like Figures 1 to 5 As shown, the electrode sheet 3 includes an excitation portion 31, a pole claw portion 32, and a connecting portion 33 connecting the excitation portion 31 and one end of the pole claw portion 32. The drive coil winding 2 is arranged around the excitation portion 31, and the pole claw portions 32 of the electrode sheet 3 corresponding to the same drive coil winding 2 are alternately distributed along the circumferential direction. In this embodiment, the number of pole claw portions 32 corresponding to the same electrode sheet 3 is not necessarily one, and the extension direction of the pole claw portions 32 of the same electrode sheet 3 is the same, that is, the magnetic properties of the pole claw portions 32 of the same electrode sheet 3 are the same. The electrode sheet 3 is made of magnetic conductive material.

[0045] In this embodiment, the two electrode sheets 3 are respectively a first electrode sheet 34 and a second electrode sheet 35, the first electrode sheet 34 has a first pole claw portion 342, the second electrode sheet 35 has two second pole claw portions 352, and the first pole claw portion 342 is inserted between the two second pole claw portions 352. The first pole claw portion 342 and the second pole claw portion 352 corresponding to the same drive coil winding 2 extend in opposite directions, and the first pole claw portions 342 corresponding to two adjacent drive coil windings 2 extend in opposite directions, so that the magnetic properties of the first pole claw portion 342 and the second pole claw portion 352 are opposite.

[0046] The first electrode sheet 34 has a first excitation portion 341 , and the second electrode sheet 35 has a second excitation portion 351 . The first excitation portion 341 abuts against the second excitation portion 351 , and the contact surface may be a plane, an inclined surface, a concave-convex surface, or the like.

[0047] The first electrode sheet 34 has a first connection portion 343 , and the second electrode sheet 35 has a second connection portion 353 . The first connection portion 343 and the second connection portion 353 are spaced apart in the axial direction, that is, one of them is close to the mounting bracket 1 , and the other is far away from the mounting bracket 1 .

[0048] In the present embodiment, each of the driving coil windings 2 is correspondingly provided with a first electrode sheet 34 and a second electrode sheet 35, and all the first electrode sheets 34 are of the same size and shape, and all the second electrode sheets 35 are of the same size and shape. Since the first electrode sheets 34 and the second electrode sheets 35 have fewer pole claw portions 32 and a simpler structure, the electrode sheets 3 of the present embodiment are easy to mold and demold, which can reduce the mold cost for manufacturing the electrode sheets, thereby reducing the cost of the stator assembly.

[0049] In addition, since a plurality of drive coil windings 2 are provided, all drive coil windings 2 are provided with pole claws 32 facing in opposite directions. For the same side of the mounting bracket 1, the number of pole claws 32 facing in opposite directions should be the same. In this embodiment, since each of the drive coil windings 2 has three pole claws 32 facing in opposite directions, and eight drive coil windings 2 are provided on one side, in this embodiment, twenty-four pole claws 32 are provided on one side, twelve of which are in the same direction, and the other twelve are facing in opposite directions.

[0050] like Figure 3 As shown, the mounting bracket 1 is made of non-magnetic conductive material, and the electrode sheet 3 is made of magnetic conductive material. As in this embodiment, it is made of plastic material, and the use of non-magnetic conductive material can avoid electromagnetic interference. In this embodiment, the mounting bracket 1 plays the role of installing the driving coil winding 2 and the electrode sheet 3. By setting the mounting bracket 1, the driving coil winding 2 and the electrode sheet 3 can be quickly installed, and the electrode sheet 3 can be decomposed.

[0051] The driving coil windings 2 on the same side of the mounting bracket 1 are arranged in a circular array. However, the pole claws 32 corresponding to the driving coil windings 2 on both sides are not symmetrically arranged, but have a certain angle deviation. That is, the twenty-four pole claws 32 on both sides of the mounting bracket 1 are not symmetrically arranged. Specifically, when there are a total of N pole claws 32 on one side of the mounting bracket 1, N / 2 pole claws 32 face one direction, and N / 2 pole claws 32 face another direction. At this time, the angle between each pole claw 32 is 360° / N. Then the N pole claws on the other side of the mounting bracket should also be spaced 360° / N, and the pole claws on both sides should be staggered at an angle, and this angle is 180° / N.

[0052] The mounting bracket 1 is provided with a plurality of mounting portions 11 on both sides. The mounting portions 11 can be integrally formed with the mounting bracket 1 by injection molding, or can be fixed to the mounting bracket by other methods such as bonding, screwing, plugging, etc. The drive coil winding 2 is arranged around the mounting portion 11 and the excitation portion 31. The plurality of mounting portions 11 on the same side are arranged at intervals to reserve winding space for the drive coil winding 2. In this embodiment, the mounting portions 11 are also arranged in a circular array.

[0053] The mounting portion 11 is formed with a clamping groove 12, and the clamping groove 12 is formed by radially inward protrusions on both sides of the mounting portion 11. The excitation portion 31 is inserted into the clamping groove 12 at both ends along the axial direction. The clamping groove 12 limits the position of the excitation portion 31 along the circumferential direction, which is beneficial for the driving coil winding 2 to excite the excitation portion 31. More specifically, when the electric field in the driving coil winding 2 changes, due to the electromagnetic effect, it can cause the magnetic pole magnetic field defined by the pole claw portion 32 to change. Through the change of the stator magnetic field, the rotor assembly surrounded by the stator assembly 10 is driven to rotate at a certain step angle.

[0054] The two side surfaces of the mounting bracket 1 are formed with positioning parts for positioning the connecting part 33. In this embodiment, the positioning parts are receiving grooves 13 formed by recessing from the two side surfaces of the mounting bracket 1. In other embodiments, the positioning parts can also be in other forms as long as the positioning of the electrode sheet 3 can be achieved.

[0055] The excitation parts 31 of the two electrode sheets 3 are respectively inserted into the receiving grooves 13 along the upper and lower sides. The number of the receiving grooves 13 is the same as the number of the drive coil windings 2, that is, one mounting part 11 corresponds to one receiving groove 13. Since in this embodiment, each drive coil winding 2 is provided with a first electrode sheet 34 and a second electrode sheet 35, the shapes of the receiving grooves 13 corresponding to the two adjacent mounting parts 11 are different, one of which corresponds to the first connecting part 343, and the other corresponds to the second connecting part 353, and they are arranged alternately. In this way, in addition to making the first pole claw part 342 and the second pole claw part 352 corresponding to the same drive coil winding 2 extend in opposite directions, the first pole claw part and the second pole claw part 352 of the two adjacent drive coil windings 2 can also extend in opposite directions, so that all pole claw parts 32 are arranged alternately in N / S.

[0056] like Figures 6 to 9 As shown, the installation method of the stator assembly 10 of the present invention includes the following steps:

[0057] S1: Alternately install the first electrode sheets 34 and the second electrode sheets 35 on one side on the mounting bracket 1, so that the corresponding first excitation parts 341 and the second excitation parts are inserted into the clamping groove 12 close to the side of the mounting bracket 1;

[0058] S2: Winding around one side mounting portion 11 to form a drive coil winding 2;

[0059] S3: inserting the first excitation portion 341 and the second excitation portion of the first electrode sheet 34 and the second electrode sheet 35 into the holding groove 12 from the side away from the mounting bracket 1;

[0060] S4: repeat steps S1-S3 to complete the installation of the first electrode sheet 34, the second electrode sheet 35 and the driving coil winding 2 on the other side of the mounting bracket 1;

[0061] S5: forming the stator assembly 10 by overmolding.

[0062] The stator assembly 10 and the installation method thereof, as well as the stepper motor 100 of the present invention, reduce the number of pole claws 32 required for excitation of each drive coil winding 2 by arranging multiple drive coil windings 2 on each side, thereby shortening the magnetic circuit, reducing magnetic resistance, and improving the utilization efficiency of the magnetic field.

[0063] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0064] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A stator assembly, characterized in that: The stator assembly (10) comprises a mounting bracket (1), a drive coil winding (2) arranged on both sides of the mounting bracket (1), and a plurality of electrode sheets (3) arranged on both sides of the mounting bracket (1); at least two drive coil windings (2) are arranged on one side of the mounting bracket (1); each drive coil winding (2) is correspondingly provided with at least two electrode sheets (3); the electrode sheets (3) comprise an excitation portion (31) and a pole claw portion (32); the drive coil winding (2) is arranged around the excitation portion (31), and the electrode sheets (3) are provided with a plurality of electrode sheets (3) on both sides of the mounting bracket (1); The pole claw portions (32) of the electrode sheets (3) corresponding to the drive coil winding (2) are alternately distributed along the circumferential direction, and each drive coil winding (2) is provided with two electrode sheets (3) correspondingly, the two electrode sheets (3) being respectively a first electrode sheet (34) and a second electrode sheet (35), the first electrode sheet (34) having a first pole claw portion (342), the second electrode sheet (35) having two second pole claw portions (352), the first pole claw portion (342) being inserted between the two second pole claw portions (352).

2. The stator assembly according to claim 1, characterized in that: The mounting bracket (1) is made of non-magnetic conductive material, and the electrode sheet (3) is made of magnetic conductive material.

3. The stator assembly according to claim 1, characterized in that: The drive coil windings (2) on the same side of the mounting bracket (1) are arranged in a circular array.

4. The stator assembly according to claim 1, characterized in that: The mounting bracket (1) is provided with a plurality of mounting portions (11) on both sides, and the drive coil winding (2) is arranged around the mounting portions and the excitation portion (31).

5. The stator assembly according to claim 4, characterized in that: The mounting portion is formed with a clamping groove (12), and the excitation portion (31) is inserted into the clamping groove (12) along the axial direction.

6. The stator assembly according to claim 1, characterized in that: The electrode sheet (3) further comprises a connecting portion (33) connecting the excitation portion (31) and one end of the pole claw portion (32), and positioning portions for positioning the connecting portion (33) are formed on both side surfaces of the mounting bracket (1).

7. The stator assembly according to claim 1, characterized in that: The first pole claw portion (342) and the second pole claw portion (352) corresponding to the same drive coil winding (2) extend in opposite directions, and the first pole claw portions corresponding to two adjacent drive coil windings (2) extend in opposite directions.

8. The stator assembly according to claim 1, characterized in that: The first electrode sheet (34) has a first excitation portion (341), the second electrode sheet (35) has a second excitation portion (351), and the first excitation portion (341) and the second excitation portion (351) are in contact with each other.

9. The stator assembly according to claim 1, characterized in that: The drive coil windings (2) on the same side of the mounting bracket (1) are electrically connected, and the current directions are the same.

10. A stepping motor, characterized in that: The stepper motor (100) comprises a stator assembly (10) according to any one of claims 1 to 9.

11. A method for installing a stator assembly according to any one of claims 1 to 9, characterized in that: The method for installing the stator assembly (10) comprises the following steps: S1: Alternately mounting the first electrode sheets (34) and the second electrode sheets (35) on one side on the mounting bracket (1), so that the corresponding first excitation parts (341) and the second excitation parts are inserted into the holding grooves (12); S2: Winding a wire around the mounting portion to form a drive coil winding (2); S3: inserting the first excitation portion (341) and the second excitation portion of the first electrode sheet (34) and the second electrode sheet (35) into the holding groove (12) from the side away from the mounting bracket (1); S4: repeating steps S1-S3 to complete the installation of the first electrode sheet (34), the second electrode sheet (35) and the drive coil winding (2) on the other side of the mounting bracket (1); S5: Overmolding to form a stator assembly (10).

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