CN110739781A - punching sheets, iron cores and motors - Google Patents

Abstract

The invention relates to a punching sheet, an iron core and a motor, belonging to the technical field of motors. The punching sheet main body and a plurality of toothed yoke main bodies are evenly distributed on the punching sheet main body. The total width and total length of the end are W2 and H2 respectively, the length and width of the tooth body are H1 and W1 respectively, W2>4×W1, H1>2×H2, the punching piece of this structure is suitable for 4~18 teeth. The multi-pole motor punching design has strong versatility. The iron core includes a first punching piece and a second punching piece. It is a punching piece with the plate surface of the tooth end part and the plate surface of the tooth body part perpendicular to the plate surface of the tooth body part. Multiple first punching pieces are stacked to form a combined part. The iron core of this structure has a larger magnetic conducting area, stronger magnetic induction, more concentrated magnetic flux, and lower loss. The motor adopts the above-mentioned iron core, which has higher energy efficiency, lower temperature rise lower cost.

Description

A punch, iron core and motor

technical field

The invention belongs to the technical field of motors, and particularly relates to a punching sheet, an iron core and a motor.

Background technique

A DC motor is a motor that converts DC electrical energy into mechanical energy or a rotating electrical machine that converts mechanical energy into DC electrical energy. It is a device that can realize the mutual conversion of DC electrical energy and mechanical energy. When it operates as a motor, it is a DC motor, converting electrical energy into mechanical energy; when it operates as a generator, it is a DC generator, converting mechanical energy into electrical energy.

DC motors are widely used in electric traction due to their good speed regulation performance, and DC generators are widely used in electric power generation because of their convenient use, reliable operation, good potential waveform and small electromagnetic interference.

According to the excitation mode, DC motors are divided into three categories: permanent magnet, separately excited and self-excited. Among them, self-excitation is further divided into three types: shunt excitation, series excitation and compound excitation. The structure is mainly composed of iron core, rotating shaft, shell, etc.; The electromagnetic performance is determined by the stator and rotor iron cores matching the excitation windings, and the iron cores are generally stamped and laminated from metal sheets (ie, punched sheets).

The punching scheme designed in the prior art is usually only applicable to a motor of one specification (eg, 10 teeth), and the versatility is poor.

SUMMARY OF THE INVENTION

The invention provides a punching sheet, which is used to solve the technical problem of poor versatility caused by the fact that the punching sheet design scheme in the prior art can only be applied to a motor of one specification.

The present invention is achieved through the following technical solutions: a punching piece, comprising a punching piece main body and a plurality of toothed yoke main bodies evenly distributed on the outer circumference of the punching piece main body, the toothed yoke main body comprising a punching piece main body connected to the punching piece main body The tooth body part and the tooth end part connected to the end part of the tooth body part, the total width and total length of the tooth end part are W2 and H2 respectively, the tooth body part is a square sheet structure and the tooth body part is The length and width are H1 and W1 respectively, W2>4×W1, H1>2×H2.

Further, in order to better realize the present invention, the main body of the punching piece is a regular polygonal structure, and the center position of each side of the regular polygonal structure is respectively provided with one of the toothed yoke main bodies, and the tooth ends are close to the One side of the main body of the punching sheet is a plane, and the plane is parallel to the side corresponding to the regular polygonal structure.

Further, in order to better realize the present invention, the side length of the punching body is W3, where W3≥(4/5)×W2.

Further, in order to better realize the present invention, the center of the punching sheet body is provided with a through hole, the diameter of the through hole is d1, the diameter of the inscribed circle of the punching sheet body is d2, and the diameter of the punching sheet is d2. The diameter is D, d2>(1/2)×D, d1>(1/2)×d2.

Further, in order to better realize the present invention, a first rounded corner is provided at the corner of one end of the tooth end away from the punching sheet main body, and the radius of the first rounded corner is R1, R1<(1 /3)×H2, the adjacent two sides of the punching body are transitioned through a second rounded corner, and the radius of the second rounded corner is R3, where R3≤(1/5)×W3.

Further, in order to better realize the present invention, a gap is provided at the position where the tooth end portion is adjacent to the side of the punching piece main body and the tooth body portion, the gap is an arc structure and the gap of the gap is The radius is R2, and R2<(1/4)×W1.

Further, in order to better realize the present invention, the tooth end portion is a sheet-like structure, and the plate surface of the tooth end portion is flush with the plate surface of the tooth body portion.

Further, in order to better realize the present invention, the tooth end portion is a sheet-like structure, and the plate surface of the tooth end portion is perpendicular to the plate surface of the tooth body portion.

The present invention also provides an iron core, the iron core includes a first punching piece and a second punching piece, the first punching piece is a punching piece with the plate surface of the tooth end portion and the plate surface of the tooth body portion flush, and the above-mentioned first punching piece is a punching piece. The second punching piece is a punching piece with the plate surface of the tooth end part and the plate surface of the tooth body part perpendicular to the plate surface of the tooth body part. A piece of the second punching piece is pressed and the tooth end of the second punching piece faces the side away from the combination part.

The present invention also provides a motor including the above-mentioned iron core.

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

(1) The punch provided by the present invention includes a punch body and a plurality of toothed yoke bodies evenly distributed on the outer circumference of the punch body. The toothed yoke body includes a tooth body connected to the punch body and an end of the tooth body connected to the punch body. The total width and length of the tooth end are W2 and H2 respectively, the tooth body is a square sheet structure and the length and width of the tooth body are H1 and W1 respectively, W2>4×W1, H1 >2×H2, adopting this design scheme, the punching piece provided by the present invention is suitable for the punching piece design of multi-pole motor with 4-18 teeth, has strong versatility, and has a simple and reasonable structure, which is convenient for industrialization;

(2) The tooth end portion of the punching piece provided by the present invention is also a sheet-like structure, and the plate surface of the tooth end portion is perpendicular to the plate surface of the tooth body portion, thus forming a punching piece in which the tooth end portion is folded relative to the tooth body portion. The size of the yoke body of the punching piece adopts the above design scheme, so that the punching piece of this structure can not only effectively strengthen the insulation structure, but also improve the energy efficiency of the motor and reduce the cost;

(3) The iron core provided by the present invention includes a first punching piece and a second punching piece, the first punching piece is a punching piece with the plate surface of the tooth end part flush with the plate surface of the tooth body part, and the second punching piece is the tooth end part A punching piece whose plate surface is perpendicular to the plate surface of the tooth body, a plurality of first punching pieces are stacked to form a combined part, and two ends of the combined part are respectively laminated with a piece of the second punching piece and the tooth end of the second punching piece Facing the side away from the combined part, with this structure, the iron core provided by the present invention has a larger magnetic conducting area, stronger magnetic induction, more concentrated magnetic flux, and lower loss;

(4) The motor provided by the present invention adopts the above-mentioned iron core, so the energy efficiency of the motor is higher, the temperature rise during operation is lower, and the cost is lower.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

Fig. 1 is the structural representation of the first punching sheet in the present invention;

Fig. 2 is a partial enlarged view of A region in Fig. 1;

Fig. 3 is the structural representation of the second punching sheet in the present invention;

Fig. 4 is B-B sectional view in Fig. 3;

FIG. 5 is a schematic view of the structure of the iron core in the present invention.

In the picture:

1- punching body; 11- through hole;

2-tooth yoke body; 21-tooth body; 22-tooth end; 221-plane; 222-arc;

3-First fillet;

4- The second fillet;

5 - notch;

6- The first punch;

7- The second punch.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Obviously, the described embodiments are only some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

Example 1:

The present invention provides a punching piece, which includes a punching piece main body 1 and a plurality of tooth yoke main bodies 2 evenly distributed on the outer circumference of the punching piece main body 1. It is worth noting that the punching piece main body 1 and the toothed yoke main body 2 are integrally formed . The toothed yoke main body 2 includes a toothed body part 21 connected to the punching piece main body 1 and a toothed end part 22 connected to the end of the toothed body part 21 , and the toothed yoke main body 2 is also composed of the toothed body part 21 and the toothed end part 22 , the tooth body part 21 is connected to the middle position of the tooth end part 22 , and the segment of the tooth end part 22 located on both sides of the tooth body part 21 is symmetrical.

The total width and total length of the tooth end portion 22 are W2 and H2 respectively, the tooth body portion 21 is a square sheet-like structure, and the length and width of the tooth body portion 21 are H1 and W1 respectively. It is worth noting that the tooth end portion 22 is also and The tooth body portion 21 is a sheet-like structure with the same thickness, and the punching body 1 is also a sheet-like structure with the same thickness as the tooth body portion 21 .

W2>4×W1, H1>2×H2, by adopting this design scheme, the punching piece provided by the present invention is suitable for the punching piece design of 4-18 teeth multi-pole motor, and has strong versatility, simple and reasonable structure, and convenient industrialization. , and the use of this design scheme can shorten the research and development cycle and reduce the research and development cost. This design scheme is suitable for stator punching and rotor punching.

Example 2:

This embodiment is a best implementation of Embodiment 1. The punching body 1 in this embodiment is a regular polygon structure, and the center position of each side of the facing structure is respectively provided with the above-mentioned tooth yoke body 2, In this way, the sides that are also connected to the yoke body 2 are straight. In this embodiment, the side of the tooth end portion 22 close to the punch body 1 is a plane 221, and the plane 221 is parallel to the side corresponding to the regular polygon structure. With this structure, a rectangular winding chamber is formed between the tooth end portion 22 and the side corresponding to the regular polygonal structure, so that the coils wound in the chamber can be placed more uniformly in each position of the chamber.

Of course, the above-mentioned punching body 1 may also have a circular structure.

More preferably, in this embodiment, the side length of the punching body 1 is defined as W3, W3≥(4/5)×W2, so as to obtain better effects.

Example 3:

This embodiment is a more preferred implementation of Embodiment 2. In this embodiment, the center of the punching body 1 is provided with a through hole 11. The through hole 11 may be a circular hole or a regular polygonal hole, which defines the The diameter of the hole 11 is d1, and the diameter of the inscribed circle of the main body 1 of the punching sheet is d2, and the diameter of the entire punching sheet is D (also the diameter of the circumscribed circle of the entire punching sheet is D), d2>(1/2)× D, d1>(1/2)*d2.

As another implementation of this embodiment, the center of the punching body 1 is solid, and the through hole 11 is not provided.

It is worth noting that a specific implementation of this embodiment is as follows: the surface of the side of the tooth end portion 22 away from the main body 1 of the punching sheet is parallel to the above-mentioned plane 221 . As a best implementation of this embodiment, the side surface of the tooth end portion 22 away from the main body 1 of the punching piece is an arc surface 222, which can make the gap between the punching piece and the motor housing more narrow when in use. In order to obtain a better effect, the end surface connecting the arc surface 222 and the above-mentioned plane 221 is perpendicular to the above-mentioned plane 221 .

Example 4:

This embodiment is a more preferred implementation of the above-mentioned embodiment. In this embodiment, the corner of the tooth end portion 22 away from one end of the punching sheet main body 1 is provided with a first rounded corner 3, and the radius of the first rounded corner 3 is limited to be R1, R1 <(1/3)×H2. More preferably, the second rounded corner 4 is transitioned between the adjacent two sides of the above-mentioned punching body 1, that is, the second rounded corner 4 is set between the adjacent two sides of the above-mentioned regular polygon structure, and the radius of the second rounded corner 4 is limited. is R3, R3≤(1/5)×W3. With this design, the first rounded corners 3 and the second rounded corners 4 can avoid damage to the coil during the winding process.

More preferably, a notch 5 is provided at the position where the side of the tooth end portion 22 close to the punching piece main body 1 is connected with the tooth body portion 21 (that is, the position where the flat surface 221 is connected with the tooth body portion 21 ), and The notch 5 is an arc structure, and the radius of the notch 5 is defined as R2, where R2<(1/4)×W1.

Example 5:

This embodiment is a specific implementation of Embodiment 4. The plate surface of the tooth end portion 22 in the punch provided in this embodiment is flush with the plate surface of the tooth body portion 21. At this time, the entire punch is presented as A tiled and expanded state.

Example 6:

This embodiment is another specific implementation of Embodiment 4. In the punching sheet provided in this embodiment, the plate surface of the tooth end portion 22 is perpendicular to the plate surface of the tooth body portion 21. At this time, the entire punching sheet appears as a In a folded state, the punching sheet of this structure can increase the magnetic conduction cross-sectional area, enhance the magnetic induction, concentrate the magnetic flux and reduce the eddy current loss of the slot when it is used.

It is worth noting that, due to the existence of the above-mentioned gap 5, the punching piece provided in this embodiment will more easily realize that the plate surface of the tooth end portion 22 is perpendicular to the plate surface of the tooth body portion 21.

Example 7:

This embodiment provides an iron core, the iron core includes a first punching piece 6 and a second punching piece 7 , the first punching piece 6 is the punching piece described in the above-mentioned Embodiment 5, and also the first punching piece 6 For the punching sheet in the unfolded state, the second punching sheet 7 is the punching sheet described in the above-mentioned Embodiment 6, and the second punching sheet 7 is also the punching sheet in the folded state.

The number of the above-mentioned first punching pieces 6 is a plurality of pieces, and the plurality of first punching pieces 6 are punched and laminated to form a combined part, and a piece of the above-mentioned second punching piece 7 is laminated at both ends of the combined part, and the second punching piece 7 is laminated. The tooth end portion 22 of the punching piece 7 faces the side away from the combination portion.

The iron core with the above structure has the advantages of larger magnetic conducting area, stronger magnetic induction, more concentrated magnetic flux and lower loss.

Example 8:

This embodiment provides a motor, which adopts the iron core described in Embodiment 7, so the motor has higher energy efficiency, lower temperature rise during operation, and lower cost.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited to this. Any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. should be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (10)

1. The punching sheets are characterized by comprising a punching sheet main body and a plurality of tooth yoke main bodies uniformly distributed on the outer circumference of the punching sheet main body, wherein each tooth yoke main body comprises a tooth body part connected to the punching sheet main body and a tooth end part connected to the end part of the tooth body part, the total width and the total length of each tooth end part are respectively W2 and H2, the tooth body part is of a square sheet structure, the length and the width of each tooth body part are respectively H1 and W1, W2 is more than 4 xW 1, and H1 is more than 2 xH 2.
2. 2. The kinds of stampings defined in claim 1, wherein the stampings main body is a regular polygon structure, tooth yoke main bodies are respectively disposed at the central position of each side of the regular polygon structure, the side of the tooth end portion close to the stampings main body is a plane, and the plane is parallel to the side corresponding to the regular polygon structure.
3. 3. The kinds of punching sheets of claim 2, wherein the side length of the punching sheet main body is W3, W3 ≧ (4/5) xW 2.
4. 4. The kinds of punching sheets of claim 3, wherein the punching sheet main body has a through hole in its center, the through hole has a diameter of D1, the punching sheet main body has an inscribed circle diameter of D2, the punching sheet has a diameter of D, D2 > (1/2) x D, D1 > (1/2) x D2.
5. 5. The kinds of punching sheets of claim 3, wherein the corners of the ends of the tooth ends, which are far away from the punching sheet main body, are provided with th round corners, the radius of the th round corner is R1, R1 is less than (1/3) x H2, adjacent two sides of the punching sheet main body are transited through second round corners, and the radius of the second round corners is R3, R3 is less than or equal to (1/5) x W3.
6. 6. The kinds of stamped pieces of any of claims 1 to 5, wherein the positions of the end portions of the teeth, which are close to the side of the stamped piece main body and are connected with the tooth body portions, are provided with notches, the notches are of arc-shaped structures, the radius of each notch is R2, and R2 < (1/4) × W1.
7. 7. The kinds of punching sheets of claim 6, wherein the tooth end portion is a sheet-like structure, and the plate surface of the tooth end portion is flush with the plate surface of the tooth body portion.
8. 8. The kinds of punching sheets of claim 6, wherein the tooth end portion is a sheet-shaped structure, and the plate surface of the tooth end portion is perpendicular to the plate surface of the tooth body portion.
9. 9, kinds of iron cores, characterized by including punching and second punching, the punching is the punching of claim 7, the second punching is the punching of claim 8, the quantity of punching is the multiple, the multiple punching is folded and pressed and is formed the combination portion, the both ends of combination portion fold respectively and press the second punching and the tooth tip of the second punching is towards keeping away from the side of combination portion.
10. An electrical machine of , comprising the core of claim 9.

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