Punch, iron core and motor

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 tooth yoke main bodies uniformly distributed on the punching sheet main body, the tooth yoke main body comprises a tooth body part and a tooth end part, the total width and total length of the tooth end part are W2 and H2 respectively, the length and width of the tooth body part are H1 and W1 respectively, W2>4×W1, H1>2×H2, the punching sheet of this structure is suitable for the punching sheet design of a multi-pole motor with 4 to 18 teeth, and has strong versatility. The iron core comprises a first punching sheet and a second punching sheet, the first punching sheet is a punching sheet whose tooth end part plate surface is flush with the tooth body part plate surface, the second punching sheet is a punching sheet whose tooth end part plate surface is perpendicular to the tooth body part plate surface, a plurality of first punching sheets are stacked into a combined part, a second punching sheet is stacked at both ends of the combined part respectively, and the tooth end part of the second punching sheet faces a side away from the combined part, the iron core of this structure has a larger magnetic conductive area, a stronger magnetic induction, a more concentrated magnetic flux, and a lower loss, and the motor adopts the iron core, the motor has higher energy efficiency, and lower temperature rise and cost.

Description

Technical Field

[0001] The invention belongs to the technical field of motors, and in particular relates to a punching sheet, an iron core and a motor. Background Art

[0002] A DC motor is an electric motor that converts DC power into mechanical energy or a rotating motor that converts mechanical energy into DC power. It is a device that can realize the mutual conversion between DC power and mechanical energy. When it works as a motor, it is a DC motor that converts electrical energy into mechanical energy; when it works as a generator, it is a DC generator that converts mechanical energy into electrical energy.

[0003] DC motors are widely used in electric traction due to their good speed regulation performance. DC generators are widely used in electric power generation due to their ease of use, reliable operation, good potential waveform and low electromagnetic interference.

[0004] DC motors are divided into three categories according to the excitation method: permanent magnet, externally excited and self-excited. Self-excitation is further divided into shunt excitation, series excitation and compound excitation. The structure is mainly composed of iron core, rotating shaft, shell, etc.; its basic electromagnetic performance is determined by the matching excitation winding of the stator and rotor cores, and the iron core is generally formed by stamping and stacking of metal sheets (also known as punching sheets).

[0005] The punching scheme designed in the prior art is usually only applicable to motors of one specification (such as 10 teeth), and has poor versatility. Summary of the invention

[0006] The present invention provides a punching sheet, which is used to solve the technical problem that the punching sheet design scheme in the prior art can only be applied to motors of one specification, resulting in poor versatility.

[0007] The present invention is achieved through the following technical scheme: a punching sheet, including a punching sheet body and a plurality of tooth yoke bodies evenly distributed on the outer circumference of the punching sheet body, the tooth yoke body including a tooth body portion connected to the punching sheet body and a tooth end portion connected to the end of the tooth body portion, the total width and total length of the tooth end portion are W2 and H2 respectively, the tooth body portion is a square sheet structure and the length and width of the tooth body portion are H1 and W1 respectively, W2>4×W1, H1>2×H2.

[0008] Furthermore, in order to better realize the present invention, the punching sheet body is a regular polygon structure and a tooth yoke body is provided at the center position of each side of the regular polygon structure, and the side of the tooth end close to the punching sheet body is a plane and the plane is parallel to the corresponding side of the regular polygon structure.

[0009] Furthermore, in order to better implement the present invention, the side length of the punching sheet body is W3, W3≥(4 / 5)×W2.

[0010] Furthermore, in order to better implement the present invention, a through hole is provided at the center of the punch body, the aperture of the through hole is d1, the diameter of the inscribed circle of the punch body is d2, and the diameter of the punch is D, d2>(1 / 2)×D, d1>(1 / 2)×d2.

[0011] Furthermore, 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 punch body, and the radius of the first rounded corner is R1, R1<(1 / 3)×H2, and the adjacent sides of the punch body are transitioned by a second rounded corner, and the radius of the second rounded corner is R3, R3≤(1 / 5)×W3.

[0012] Furthermore, in order to better implement the present invention, a notch is provided at the position where the tooth end portion is close to the side of the punch body and connected to the tooth body portion, and the notch is an arc structure and the radius of the notch is R2, R2<(1 / 4)×W1.

[0013] Furthermore, in order to better implement 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.

[0014] Furthermore, in order to better implement 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.

[0015] The present invention also provides an iron core, which includes a first punching sheet and a second punching sheet. The first punching sheet is a punching sheet whose tooth end plate surface is flush with the tooth body plate surface, and the second punching sheet is a punching sheet whose tooth end plate surface is perpendicular to the tooth body plate surface. There are multiple first punching sheets, and the multiple first punching sheets are stacked to form a combined part. The two ends of the combined part are respectively stacked with a piece of the second punching sheet and the tooth end of the second punching sheet faces the side away from the combined part.

[0016] The present invention also provides a motor, which comprises the iron core.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) The punching sheet provided by the present invention comprises a punching sheet body and a plurality of tooth yoke bodies uniformly distributed on the outer circumference of the punching sheet body. The tooth yoke body comprises a tooth body portion connected to the punching sheet body and a tooth end portion connected to the end portion of the tooth body portion. The total width and total length of the tooth end portion are W2 and H2 respectively. The tooth body portion is a square sheet structure and the length and width of the tooth body portion are H1 and W1 respectively. W2>4×W1, H1>2×H2. With this design scheme, the punching sheet provided by the present invention is suitable for the design of multi-pole motor punching sheets with 4 to 18 teeth, has strong versatility, and has a simple and reasonable structure, which is convenient for industrialization.

[0019] (2) The tooth end of the punching sheet provided by the present invention is also a sheet-like structure, and the plate surface of the tooth end is perpendicular to the plate surface of the tooth body, so that the tooth end is folded relative to the tooth body. The main body size of the tooth yoke of this punching sheet adopts the above-mentioned design scheme. In this way, the punching sheet of this structure can not only effectively enhance the insulation structure when used, but also improve the energy efficiency of the motor and reduce the cost;

[0020] (3) The iron core provided by the present invention comprises a first punching sheet and a second punching sheet, wherein the first punching sheet is a punching sheet whose tooth end plate surface is flush with the tooth body plate surface, and the second punching sheet is a punching sheet whose tooth end plate surface is perpendicular to the tooth body plate surface, and multiple first punching sheets are stacked to form a combined part, and one of the above-mentioned second punching sheets is stacked at both ends of the combined part, and the tooth end of the second punching sheet faces the side away from the combined part. With this structure, the iron core provided by the present invention has a larger magnetic conductive area, stronger magnetic induction, more concentrated magnetic flux, and lower loss;

[0021] (4) The motor provided by the present invention adopts the above-mentioned iron core, so the motor has higher energy efficiency, lower temperature rise during operation, and lower cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a structural schematic diagram of the first punching sheet in the present invention;

[0024] Figure 2 yes Figure 1 A local enlarged view of area A;

[0025] Figure 3 It is a schematic structural diagram of the second punching sheet in the present invention;

[0026] Figure 4 yes Figure 3 BB section view in;

[0027] Figure 5 It is a schematic structural diagram of the iron core in the present invention.

[0028] In the figure:

[0029] 1- punch body; 11- through hole;

[0030] 2-tooth yoke body; 21-tooth body; 22-tooth end; 221-plane; 222-arc surface;

[0031] 3-First fillet;

[0032] 4- Second fillet;

[0033] 5-Gap;

[0034] 6-First punching;

[0035] 7- Second punching. DETAILED DESCRIPTION

[0036] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0037] Embodiment 1:

[0038] The present invention provides a punching sheet, which includes a punching sheet body 1 and a plurality of tooth yoke bodies 2 uniformly distributed on the outer circumference of the punching sheet body 1. It is worth noting that the punching sheet body 1 and the tooth yoke body 2 are integrally formed. The tooth yoke body 2 includes a tooth body portion 21 connected to the punching sheet body 1 and a tooth end portion 22 connected to the end of the tooth body portion 21, that is, the tooth yoke body 2 is composed of the tooth body portion 21 and the tooth end portion 22, the tooth body portion 21 is connected to the middle position of the tooth end portion 22, that is, the sections of the tooth end portion 22 located on both sides of the tooth body portion 21 are symmetrical.

[0039] 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 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 a sheet structure with the same thickness as the tooth body portion 21, and the above-mentioned punching sheet main body 1 is also a sheet structure with the same thickness as the tooth body portion 21.

[0040] W2>4×W1, H1>2×H2, adopting this design scheme, the punching sheet provided by the present invention is suitable for the design of multi-pole motor punching sheets with 4 to 18 teeth, has strong versatility, simple and reasonable structure, convenient industrialization, and adopting 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 sheets and also for rotor punching sheets.

[0041] Embodiment 2:

[0042] This embodiment is a best implementation of embodiment 1. The punching sheet body 1 in this embodiment is a regular polygon structure, and the center position of each side of the regular polygon structure is respectively provided with a tooth yoke body 2, so that the side connected to the tooth yoke body 2 is straight. In this embodiment, the side of the tooth end 22 close to the punching sheet 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 22 and the side corresponding to the regular polygon structure, so that the coil wound in the chamber can be placed more evenly at various positions in the chamber.

[0043] Of course, the punch body 1 may also be a circular structure.

[0044] More preferably, in this embodiment, the side length of the punch body 1 is limited to W3, W3 ≥ (4 / 5) × W2, to obtain a better effect.

[0045] Embodiment 3:

[0046] This embodiment is a better implementation of Embodiment 2. In this embodiment, a through hole 11 is provided at the center of the punch body 1. The through hole 11 can be a circular hole or a regular polygonal hole. The aperture of the through hole 11 is limited to d1, and the diameter of the inscribed circle of the punch body 1 is limited to d2. The diameter of the entire punch is D (also the diameter of the circumscribed circle of the entire punch is D), d2>(1 / 2)×D, d1>(1 / 2)×d2.

[0047] As another implementation of this embodiment, the center of the punch body 1 is solid, and the through hole 11 is not provided.

[0048] It is worth noting that a specific implementation of this embodiment is as follows: the side surface of the tooth end 22 away from the punch body 1 is parallel to the plane 221. As a best implementation of this embodiment, the side surface of the tooth end 22 away from the punch body 1 is a curved surface 222, so that the gap between the punch and the motor housing is more uniform when in use, so as to obtain a better effect, and the end surface connecting the curved surface 222 and the plane 221 is perpendicular to the plane 221.

[0049] Embodiment 4:

[0050] This embodiment is a more preferred implementation of the above embodiment. In this embodiment, a first fillet 3 is provided at the corner of the tooth end 22 away from one end of the punch body 1, and the radius of the first fillet 3 is limited to R1, R1<(1 / 3)×H2. More preferably, the adjacent two sides of the punch body 1 are transitioned through a second fillet 4, that is, a second fillet 4 is provided between the adjacent two sides of the regular polygon structure, and the radius of the second fillet 4 is limited to R3, R3≤(1 / 5)×W3. With this design, the first fillet 3 and the second fillet 4 can avoid damage to the coil during the winding process.

[0051] More preferably, a notch 5 is provided at a position where the tooth end portion 22 is connected to the tooth body portion 21 on one side close to the punch body 1 (i.e., a position where the plane 221 is connected to the tooth body portion 21), and the notch 5 is an arc-shaped structure, and the radius of the notch 5 is limited to R2, R2<(1 / 4)×W1.

[0052] Embodiment 5:

[0053] 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 in a flat and unfolded state.

[0054] Embodiment 6:

[0055] This embodiment is another specific implementation of Example 4. The plate surface of the tooth end portion 22 in the punching sheet provided in this embodiment is perpendicular to the plate surface of the tooth body portion 21. At this time, the entire punching sheet is in a folded state. When used, the punching sheet with this structure can increase the magnetic cross-sectional area, enhance magnetic induction, gather magnetic flux and reduce slot eddy current loss.

[0056] It is worth noting that, due to the presence of the notch 5 , the punching sheet provided in this embodiment will more easily achieve that the plate surface of the tooth end portion 22 is perpendicular to the plate surface of the tooth body portion 21 .

[0057] Embodiment 7:

[0058] This embodiment provides an iron core, which includes a first punching sheet 6 and a second punching sheet 7. The first punching sheet 6 is the punching sheet described in the above-mentioned embodiment 5, that is, the first punching sheet 6 is a punching sheet in an unfolded state. The second punching sheet 7 is the punching sheet described in the above-mentioned embodiment 6, that is, the second punching sheet 7 is a punching sheet in a folded state.

[0059] There are multiple first punching sheets 6, and multiple first punching sheets 6 are punched and stacked to form a combination part, and one second punching sheet 7 is stacked at both ends of the combination part, and the tooth end 22 of the second punching sheet 7 faces the side away from the combination part.

[0060] The iron core adopting the above structure has the advantages of larger magnetic conductive area, stronger magnetic induction, more concentrated magnetic flux and lower loss.

[0061] Embodiment 8:

[0062] This embodiment provides a motor, which uses the iron core described in Embodiment 7, so the motor has higher energy efficiency, lower temperature rise during operation, and lower cost.

[0063] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention, which should be included in 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

1. A punching sheet, characterized in that: It comprises a punching sheet body and a plurality of tooth yoke bodies uniformly distributed on the outer circumference of the punching sheet body, the tooth yoke body comprises a tooth body portion connected to the punching sheet body and a tooth end portion connected to the end portion of the tooth body portion, the total width and total length of the tooth end portion are W2 and H2 respectively, the tooth body portion is a square sheet structure, and the length and width of the tooth body portion are H1 and W1 respectively, W2>4×W1, H1>2×H2; The punching sheet body is a regular polygon structure, and a tooth yoke body is provided at the center of each side of the regular polygon structure, and the side of the tooth end close to the punching sheet body is a plane, and the plane is parallel to the side corresponding to the regular polygon structure; The side length of the punch body is W3, W3≥(4 / 5)×W2; A through hole is provided at the center of the punch body, the aperture of the through hole is d1, the diameter of the inscribed circle of the punch body is d2, the diameter of the punch is D, d2>(1 / 2)×D, d1>(1 / 2)×d2; A first fillet is provided at the corner of the end of the tooth away from the punch body, the radius of the first fillet is R1, R1 < (1 / 3) × H2, and the adjacent two sides of the punch body are transitioned by a second fillet, the radius of the second fillet is R3, R3 ≤ (1 / 5) × W3; A notch is provided at a position where the tooth end portion is connected to the tooth body portion on one side close to the punching sheet main body, and the notch is an arc-shaped structure and the radius of the notch is R2, R2<(1 / 4)×W1.

2. A punch according to claim 1, characterized in that: 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.

3. A punching sheet according to claim 1, characterized in that: 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.

4. An iron core, characterized in that: It includes a first punch and a second punch, the first punch is the punch described in claim 2, the second punch is the punch described in claim 3, there are multiple first punches, and the multiple first punches are stacked to form a combined part, the two ends of the combined part are respectively stacked with a second punch and the tooth end of the second punch faces the side away from the combined part.

5. A motor, characterized in that: Comprising the iron core as claimed in claim 4.

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