A motor stator lamination

Abstract

The utility model discloses a motor stator lamination, including the inner hole ring of the hollow of the inner ring formation, the stator yoke part of the outer ring formation a plurality of along its radial outward extension and form the stator slot between each other stator tooth, the both sides of stator tooth form asymmetric first stator tooth side and second stator tooth side, first stator tooth side and second stator tooth side all form with the mode of formation arc surface, the free end surface of stator tooth still form with stator tooth homodromous extension and mutual interval tooth head, the utility model discloses asymmetric tooth side arc surface design, effective guide wire path, reduce winding deviation, tooth end positioning structure is convenient for equipment accurate positioning, effectively suppresses the vibration displacement of winding in the operation, prevents the groove and insulation wear and tear, tooth profile design has increased winding accommodation space, built -in copper strip passage can promote the heat dissipation efficiency, tooth head structure optimization magnetic line distribution, increase the effective magnetic flux in the groove, help to suppress harmonic simultaneously, reduce iron loss.

Description

TECHNICAL FIELD

[0001] The utility model relates to stator punching sheet, especially a motor stator punching sheet. BACKGROUND

[0002] The motor is widely used in industrial production and various electric appliances in life, and the existing motor has a stator and a rotor, a rotor shaft is installed in the rotor and rotates with the rotation of the rotor and outputs power. According to the position relationship between the rotor and the stator, the existing motor is divided into an internal rotor type motor and an external rotor type motor, the rotor of the internal rotor type motor is installed in the stator, and the stator is installed in the rotor of the external rotor type motor.

[0003] The stator is usually called a stator core in the manufacturing field, and the stator core usually has two kinds of splicing type and punching sheet type, the punching sheet is also called a lamination, and the punching sheet type stator core is formed by stacking a plurality of silicon steel sheets, which is beneficial to reduce eddy current loss.

[0004] In the prior art, the patent CN103078423A proposes a deep and shallow groove alternating stator punching sheet scheme, shallow grooves and deep grooves are arranged at intervals in the circumferential direction, so that the inner coil and the outer coil are wound between the deep grooves and the shallow grooves respectively, and the problems of coil space overlap and complex insulation process in the traditional design are solved. However, the scheme still has the following defects:

[0005] 1. The winding precision is insufficient, the difference in groove depth does not change the flat structure of the stator tooth side, and the micro displacement problem of the conductor wire at the tooth shoulder cannot be solved, the conductor wire lacks physical positioning and guiding during winding, and the conductor wire is prone to micro displacement at the tooth shoulder during high-speed automatic winding, which affects the winding quality and production efficiency.

[0006] 2. The coil has weak anti-vibration ability, the coil only relies on groove depth difference limiting, the conductor wire may deviate from the preset position under long-term vibration working condition, and the groove depth difference causes the insulation layer to bear uneven stress, aggravating the wear problem. UTILITY MODEL CONTENTS

[0007] In order to solve the above technical problems, the utility model provides a motor stator punching sheet.

[0008] In order to solve the above technical problems, the utility model adopts the technical scheme of: a motor stator punching sheet, comprising a stator yoke part forming a hollow inner hole ring, the outer circle of the stator yoke part forms a plurality of stator teeth extending outward along the radial direction and forming stator slots between each other, the two sides of the stator tooth form asymmetric first stator tooth side and second stator tooth side, the first stator tooth side and the second stator tooth side are formed in the form of forming an arc surface, and the free end surface of the stator tooth also forms tooth heads extending in the same direction as the stator tooth and spaced from each other.

[0009] Further, the inner ring side of the stator yoke part is formed with a plurality of inward protrusions intruding into the inner ring, and a copper bar hole is formed in each of the inward protrusions to pass through the connecting copper bar.

[0010] Further, the outer ring of the stator yoke part is in a circular ring shape, and the bottom of the stator slot is an arc edge of the outer ring of the stator yoke part, and the size of each stator slot is the same.

[0011] Further, the maximum width of the stator tooth waist part is smaller than the maximum width of the root part connecting the stator tooth and the stator yoke part and smaller than the maximum width of the free end of the stator tooth.

[0012] Further, the first stator tooth side surface comprises a first winding arc surface continuously extending from the root part to the free end of the stator tooth, and an outward arc, and the outward arc is connected with the tooth head on the side thereof.

[0013] Further, the arc shape of the first winding arc surface is a convex arc towards the side of the stator slot, and the arc shape of the outward arc is a concave arc towards the side of the stator slot.

[0014] Further, the second stator tooth side surface is formed with a second winding arc surface continuously extending from the connecting side of the stator tooth and the stator yoke part to the free end of the stator tooth, a limiting arc, and a winding device positioning part, and the winding device positioning part is connected with the tooth head on the side thereof.

[0015] Further, the arc shape of the second winding arc surface is a concave arc towards the side of the stator slot, the arc shape of the limiting arc is a convex arc towards the side of the stator slot, and the winding device positioning part is recessed into the stator tooth to form a groove.

[0016] Further, the number of tooth heads is two, and a groove is formed between the two tooth heads.

[0017] The motor stator lamination has an asymmetric tooth side arc surface design, effectively guides the wire path, reduces the winding deviation, the tooth end positioning structure facilitates the accurate positioning of the equipment, effectively suppresses the vibration displacement of the winding in operation, prevents the off-slot and insulation wear, the tooth shape design increases the winding accommodation space, the built-in copper bar channel can improve the heat dissipation efficiency, the tooth head structure optimizes the magnetic line distribution, increases the effective magnetic flux in the slot, and simultaneously helps to suppress the harmonic and reduce the iron loss. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the utility model.

[0019] Figure 2 It is a three-dimensional enlarged selected view of the utility model.

[0020] In the figure: 1, stator yoke part; 2, stator tooth; 3, stator slot; 4, inner hole ring; 5, inner convex part; 6, copper strip hole; 7, first stator tooth side; 8, second stator tooth side; 9, first winding arc surface; 10, outer extension arc; 11, second winding arc surface; 12, limiting arc; 13, winding equipment positioning part; 14, tooth head. DETAILED DESCRIPTION

[0021] The utility model will be explained in further detail below in combination with the drawings and specific embodiments.

[0022] As Figures 1-2 The embodiment relates to a motor stator punching sheet, and particularly relates to an inner stator core of an outer rotor type motor, and thus the embodiment comprises a stator yoke part 1 forming a hollow inner hole ring 4, and an outer circle of the stator yoke part 1 forms a plurality of stator teeth 2 extending radially outward and forming stator slots 3 between each other, as Figure 1 The embodiment shown in the figure shows a case where the stator tooth 2 is sixteen teeth, and the number of stator teeth 2 can be customized according to requirements in actual manufacturing, and it can be understood that the number of stator slots 3 changes with the number of stator teeth 2; and the free end surface of the stator tooth 2 further forms tooth heads 14 extending in the same direction as the stator tooth 2 and spaced from each other.

[0023] Based on the above structure, the two sides of the stator tooth 2 form asymmetric first stator tooth sides 7 and second stator tooth sides 8, and the first stator tooth sides 7 and the second stator tooth sides 8 are both formed in the form of an arc surface, compared with the traditional stator tooth, the first stator tooth sides 7 and the second stator tooth sides 8 of the stator tooth 2 of the embodiment are more beneficial to the winding of the winding in modeling, the side of the traditional stator tooth is often a straight surface, the straight surface cannot play any modeling fastening and limiting role on the stator tooth, and the fastening of the winding completely relies on the tightness of the initial winding, but as the production efficiency is further improved, the automatic winding efficiency of the existing winding equipment is significantly improved, and the small displacement in the winding process is also more frequent, while improving the precision of the winding equipment, the embodiment starts to increase the winding quality of the winding in modeling, that is, the arc surface modeling of the first stator tooth sides 7 and the second stator tooth sides 8 is convenient for winding of the winding equipment and forms a limiting effect to avoid occurrence of small displacement; in addition, the requirement for the performance of the motor is further improved, the coil has weak vibration resistance in the working process of the motor, and the existing slot depth difference limiting solution can cause abnormal wear of insulation, the embodiment improves the limiting of the winding through the arc surface modeling of the first stator tooth sides 7 and the second stator tooth side 8, and improves the reliability in long-term use.

[0024] As Figure 1As shown, the inner ring side of the stator yoke part 1 forms a plurality of inward protrusions 5 that intrude into the inner ring 4, and a copper bar hole 6 is formed in each inward protrusion 5 for penetrating the copper bar. It should be noted that the yoke part of the conventional stator is usually a standard circular inner ring. In order to improve the heat dissipation capacity of the stator lamination, the copper bar hole 6 is formed in the stator yoke part 1 to accommodate the copper bar. In order to prevent the structural strength of the stator lamination from being weakened, the copper bar hole 6 is formed in the additional inward protrusion 5 while ensuring the integrity of the stator yoke part 1. Like the existing design, the outer ring of the stator yoke part 1 is a circular ring, and the bottom of the stator slot 3 is the arc edge of the outer ring of the stator yoke part 1. Each stator slot 3 is the same size, and it can be understood that any two adjacent stator teeth 2 are equally spaced.

[0025] The maximum width of the waist of the stator tooth 2 is less than the maximum width of the root of the stator tooth 2 connected to the stator yoke part 1 and less than the maximum width of the free end of the stator tooth 2. More turns of winding can be wound on the stator tooth 2, which is beneficial to improve the smoothness of the motor at low speed and reduce copper loss. It should be noted that the number of turns of winding on the stator tooth 2 is not unlimitedly increased. The purpose of the present embodiment is to increase the space to facilitate the winding to reach the upper limit of the specified number of turns of winding. When the space of the stator slot 3 is fully utilized, there will be no adverse magnetic leakage phenomenon.

[0026] The first stator tooth side surface 7 is formed with a first winding arc surface 9 continuously from the connection side of the stator tooth 2 to the free end of the stator tooth 2, and an outward arc 10 connected to the tooth head 14 on the side. That is, the first stator tooth side surface 7 is divided into a first winding arc surface 9 and an outward arc 10 continuously formed from one end to the other end. Preferably, the first winding arc surface 9 is convex towards the side of the stator slot 3, and the outward arc 10 is concave towards the side of the stator slot 3. That is, the first winding arc surface 9 is convex towards the side of the adjacent stator slot 3, and then the outward arc 10 continuously formed from the first winding arc surface 9 is concave towards the side of the adjacent stator slot 3, thereby forming arc surfaces with different arc shapes. Further, the convex arc structure of the first winding arc surface 9 forms a guide curve when winding, so that the wire adheres to the tooth side and moves. Further, the concave arc of the outward arc 10 naturally converges the wire at the tooth head 14, avoiding disengagement.

[0027] On this basis, when the winding is wound on the first stator tooth side 7, the winding part is mainly concentrated on the first stator tooth side 7, and because the connecting part between the first stator tooth side 7 and the stator yoke 1 has a limiting transition section, the displacement of the winding to the stator yoke 1 in the radial direction is limited, which is beneficial to the operation of the winding device and also stronger in the anti-shock ability during the use of the motor; further, because the outward arc 10 is an inner concave arc, the outward transition section of the outward arc 10 to the tooth head 14 limits the winding at the free end in the radial direction, thereby comprehensively improving the anti-shock ability during use.

[0028] The second stator tooth side 8 is formed with a second winding arc surface 11 continuously from the connecting side of the stator tooth 2 and the stator yoke 1 to the free end of the stator tooth 2, a limiting arc 12, and a winding device positioning part 13. The winding device positioning part 13 is connected with the tooth head 14 on the side thereof, that is, the second stator tooth side 8 is divided into the second winding arc surface 11, the limiting arc 12, and the winding device positioning part 13 which are continuously formed from one end to the other end. Preferably, the arc shape of the second winding arc surface 11 is a concave arc towards the side of the stator slot 3, the arc shape of the limiting arc 12 is a convex arc towards the side of the stator slot 3, and the winding device positioning part 13 is recessed inwardly to the stator tooth 2 to form a groove, that is, the second winding arc surface 11 is recessed inwardly to the side of the adjacent stator slot 3, the limiting arc 12 is convex outwardly to the side of the adjacent stator slot 3, and the winding device positioning part 13 is recessed inwardly to the side of the adjacent stator slot 3. It should be noted that the outermost side of the limiting arc 12 is in the same straight line with the side surface of the tooth head 14 on the side thereof.

[0029] On this basis, when the winding is wound on the second stator tooth side 8, the winding part is mainly concentrated on the second winding arc surface 11, and the limiting arc 12 forms a structural limitation to the winding by the outward convex shape to resist the displacement of the winding during winding, that is, the convex part of the limiting arc 12 contacts the winding wire package, and the radial displacement is inhibited by increasing the friction force of the contact surface. The second stator tooth side 8 is the same as the first stator tooth side 7 in that the connecting part between the second stator tooth side 8 and the stator yoke 1 has a limiting transition section, so that the displacement of the winding to the stator yoke 1 in the radial direction is limited, which is beneficial to the operation of the winding device.

[0030] The groove formed by the winding device positioning part 13 of the embodiment is beneficial to the edge matching of the skeleton of the winding device, improves the positioning accuracy of the initial operation of the winding device, and an additional layer of insulating paper is additionally assembled in the winding device positioning part 13 during the later assembly process.

[0031] As Figure 2As shown, the number of tooth heads 14 is two, and a groove is formed between the two tooth heads 14, the groove reduces the area of the magnetic conductive material compared to the traditional flat tooth head, increases the magnetic resistance of the tooth head 14, makes part of the magnetic lines of force shunt to the positions of the tooth heads 14 on both sides, the groove between the two tooth heads 14 increases the magnetic resistance of the tooth head end, forces the magnetic flux originally concentrated in the middle of the tooth head to shunt to the tooth heads on both sides, forms double magnetic flux wave peaks, weakens the high-order harmonics while improving the effective magnetic flux in the slot.

[0032] The application discloses a motor stator lamination, an asymmetric tooth side arc surface design, effective guide wire path, reduce winding deviation; tooth end positioning structure facilitates accurate positioning of equipment; effectively suppresses vibration displacement of the winding in operation, prevents slotting and insulation wear; tooth shape design increases winding accommodation space, built-in copper strip channel can improve heat dissipation efficiency; tooth head structure optimizes magnetic line distribution, increases effective magnetic flux in the slot, and helps to suppress harmonics and reduce iron loss.

[0033] The above embodiment is not a limitation of the utility model, and the utility model is not limited to the above examples, and the changes, modifications, additions or replacements made by the person skilled in the art within the technical scheme range of the utility model also belong to the protection range of the utility model.

Claims

1. A stator lamination for an electric motor, characterized in that: The stator yoke (1) includes a hollow inner ring (4) forming an inner ring. The outer ring of the stator yoke (1) forms a number of stator teeth (2) that extend radially outward and form stator slots (3) between each other. The two sides of the stator teeth (2) form an asymmetrical first stator tooth side surface (7) and a second stator tooth side surface (8). The first stator tooth side surface (7) and the second stator tooth side surface (8) are both formed in the manner of forming arc surfaces. The free end face of the stator teeth (2) also forms tooth heads (14) that extend in the same direction as the stator teeth (2) and are spaced apart from each other.

2. The motor stator lamination according to claim 1, characterized in that: The inner ring side of the stator yoke (1) forms a plurality of inner protrusions (5) that intrude into the inner ring (4), and each inner protrusion (5) is provided with a copper strip hole (6) for penetrating and connecting the copper strip.

3. The motor stator lamination according to claim 1, characterized in that: The outer ring of the stator yoke (1) is circular, and the bottom of the stator slot (3) is the arc edge of the outer ring of the stator yoke (1). Each stator slot (3) is the same size.

4. The motor stator lamination according to claim 1, characterized in that: The maximum width of the waist of the stator tooth (2) is less than the maximum width of the root of the connection between the stator tooth (2) and the stator yoke (1) and is less than the maximum width of the free end of the stator tooth (2).

5. The motor stator lamination according to claim 1, characterized in that: The first stator tooth side surface (7) includes a first winding arc surface (9) and an outward arc (10) that extend continuously from the root of the stator tooth (2) to the free end. The outward arc (10) is connected to the tooth head (14) on its side.

6. The motor stator lamination according to claim 5, characterized in that: The arc shape of the first winding arc surface (9) is a convex arc facing the stator slot (3), and the arc shape of the outward arc (10) is a concave arc facing the stator slot (3).

7. The motor stator lamination according to claim 1, characterized in that: The second stator tooth side surface (8) has a second winding arc surface (11), a limiting arc (12), and a winding equipment positioning part (13) that are continuously formed from the connection side of the stator tooth (2) and the stator yoke (1) to the free end of the stator tooth (2). The winding equipment positioning part (13) is connected to the tooth head (14) on its side.

8. The motor stator lamination according to claim 7, characterized in that: The arc shape of the second winding arc surface (11) is a concave arc facing the stator slot (3), and the arc shape of the limiting arc (12) is a convex arc facing the stator slot (3). The winding equipment positioning part (13) is recessed into the stator tooth (2) to form a groove.

9. The motor stator lamination according to claim 1, characterized in that: The number of teeth (14) is two, and a groove is formed between the two teeth (14).

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