Stator core and motor using same

Abstract

The utility model discloses a stator core and a motor applying the same, the center of the stator core is provided with a circular rotor hole, a plurality of stator slots are uniformly distributed around the rotor hole, the stator slots comprise large stator slots and small stator slots, and the slot bottom diameter D5 of each large stator slot is greater than the slot bottom diameter D4 of each small stator slot. The outer contour of the stator core is provided with a first arc-shaped surface positioned on the radial outer side of the small stator slot and a mounting part positioned on the radial outer side of the large stator slot, and the mounting part is provided with a threaded hole axially penetrating through the stator core; the rotor hole, the groove bottom of the large stator groove, the groove bottom of the small stator groove, the first arc-shaped surface and the cylindrical surface externally tangent to the threaded hole are concentrically arranged; the diameter of the first arc-shaped surface is D2, the diameter of the cylindrical surface externally tangent to the threaded hole is D1, and D2-D4 = D1-D5. According to the utility model, through the optimized design of the outer contour of the stator core, the lengths of the yoke parts of the large and small slots are substantially equal, the magnetic density consistency of the yoke parts of the slots is ensured, the vibration of the motor is reduced, and the noise is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a stator core and a motor applying the same. Background Art

[0002] When the number of turns of the stator coil is different, the same slot shape of the stator punching sheet will cause different slot fillings. Therefore, the design of large and small slot punching sheets came into being. In the prior art, the yoke height of the small slots of the stator punching sheet is not equal to the yoke height of the large slots, and the uniformity of the magnetic density is not ensured, resulting in poor heat dissipation, easy local heating of the motor, affecting the performance of the motor, and the noise of the motor is also relatively large.

[0003] The utility model patent with the patent number CN201409019Y discloses that the yoke heights of different slot shapes are made equal to achieve the consistency of the magnetic density. The adopted scheme is to design the outer contour of the stator core as a stepped structure, so as to reduce the yoke lengths corresponding to the slots on both sides. However, this scheme only adjusts the yoke length difference relative to the original square or rectangular outer contour, and cannot achieve the complete equality of the yoke heights of each slot shape. Moreover, through long-term use, it is found that when threaded holes are provided on the stator core, the threaded holes on the stator core have a great influence on the magnetic density distribution. The air gap caused by the threaded holes increases the magnetic resistance and prevents the magnetic circuit from passing through. Therefore, the yoke height of the stator slot located radially inside the threaded hole can actually only be calculated to the threaded hole and cannot be calculated to the outer contour of the stator core. The stator core design in the prior art does not consider this aspect of the problem, resulting in the inability to unify the magnetic circuit heights of each slot.

[0004] In addition, due to the large installation surface of the stator core in the prior art, there is a problem of insufficient concentricity after being assembled with the rear end cover, resulting in uneven air gap.

[0005] In summary, how to design a stator core that can effectively achieve the magnetic density uniformity design and improve the heat dissipation effect of the motor is a technical problem that needs to be solved at present. Summary of the Utility Model

[0006] In order to solve the technical problems of uneven magnetic density and poor heat dissipation effect existing in the motors of the prior art, the utility model provides a stator core and a motor applying the same to solve the above problems.

[0007] The utility model provides a stator core, a circular rotor hole is opened at the center of the stator core, and a plurality of stator slots are evenly distributed around the rotor hole. The stator slots include a large stator slot group formed by a plurality of large stator slots and a small stator slot group formed by a plurality of small stator slots. The bottom diameter D5 of each large stator slot is greater than the bottom diameter D4 of each small stator slot.

[0008] The outer contour of the stator core has a first arc surface located radially outside the small stator slots and a mounting portion located radially outside the large stator slots. The mounting portion is provided with threaded holes axially penetrating the stator core; the rotor hole, the bottom of the large stator slots, the bottom of the small stator slots, the first arc surface, and the cylindrical surface tangent to the threaded holes are all concentrically arranged; let the diameter of the first arc surface be D2, and the diameter of the cylindrical surface tangent to the threaded holes be D1, then D2 - D4 = D1 - D5.

[0009] Further, four groups of small stator slots are evenly arranged, and the small stator slot groups and the large stator slot groups are arranged at intervals in turn.

[0010] Further, the outer surface of the mounting portion is a convex table surface that is in contact and cooperation with the rear end cover of the motor.

[0011] Further, the end arc length L of the convex table surface is 15 mm to 20 mm.

[0012] Further, the ratio of the area of the small stator slots to the area of the large stator slots is 0.8 to 0.85.

[0013] Further, the convex table surface and the first arc surface are connected by a transition surface, and the distance from the transition surface to the center of the rotor hole is less than the distance from the convex table surface to the center of the rotor hole, so as to form a ventilation port between the transition surface and the blower cover of the motor.

[0014] Further, the transition surface is a cutting plane.

[0015] The present utility model also proposes a motor, including the stator core described above, and windings are wound in the stator slots of the stator core.

[0016] Further, the windings include a main winding and an auxiliary winding. The main winding and the auxiliary winding are both set to have a pair of poles and are symmetrically embedded in the stator slots, and the symmetry planes of the main winding and the auxiliary winding are perpendicular to each other.

[0017] Further, both the main winding and the auxiliary winding include five groups of coils.

[0018] The beneficial effects of the present utility model are:

[0019] (1) Through the optimized design of the outer contour of the stator core of the present utility model, the lengths of the yoke parts of the large and small slots are substantially equal, ensuring that the magnetic density of the yoke parts of the slots is consistent, reducing the vibration of the motor and lowering the noise.

[0020] (2) The present utility model optimizes the wire embedding processability, making the slot fill factor in each slot basically the same, effectively improving the wire embedding quality and the utilization rate of the iron core, reducing the weight of the stator core, and lowering the cost.

[0021] (3) The utility model improves the contact surface structure between the stator core and the rear end cover, improves the concentricity of the installation of the stator core and the rear end cover, ensures uniform air-gap magnetic density, and effectively reduces noise. Description of the Drawings

[0022] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0023] Figure 1 is the front view of the stator core of the present utility model;

[0024] Figure 2 is the assembly schematic diagram of the stator core and the rear end cover in the present utility model;

[0025] Figure 3 is the schematic diagram of the positional relationship between the stator core and the blower housing in the present utility model;

[0026] Figure 4 is the schematic diagram of the internal air path of the motor of the present utility model (the direction indicated by the arrow is the air path);

[0027] Figure 5 is the exploded view of the motor of the present utility model;

[0028] Figure 6 is the schematic diagram of the winding connection in the present utility model.

[0029] In the figures, 1, rotor hole; 2, large stator slot; 3, large stator slot group; 4, small stator slot; 5, stator core; 6, first arc surface; 7, installation part; 8, threaded hole; 9, convex table surface; 10, rear end cover; 11, buckle; 12, ventilation opening; 13, blower housing; 14, fan; 15, transition surface; 16, stator assembly; 17, main winding; 18, auxiliary winding; 19, small stator slot group; 20, front end cover; 21, rotor assembly. Detailed Embodiment

[0030] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model and should not be construed as limiting the present utility model.

[0031] Embodiment 1

[0032] A stator core, a circular rotor hole 1 is provided in the center of the stator core 5, the diameter of the rotor hole 1 is D3, and a plurality of stator slots are evenly distributed around the rotor hole 1. The stator slots include a large stator slot group 3 formed by a plurality of large stator slots 2 and a small stator slot group 19 formed by a plurality of small stator slots 4. The bottom diameter D5 of each large stator slot 2 is greater than the bottom diameter D4 of each small stator slot 4. The term "plurality" means two or more. In this embodiment, there are four large stator slots 2 in the large stator slot group 3 and two small stator slots 4 in the small stator slot group 19.

[0033] The outer contour of the stator core 5 has a first arc surface 6 located radially outside the small stator slot 4 and a mounting portion 7 located radially outside the large stator slot 2. A threaded hole 8 axially penetrating the stator core 5 is provided on the mounting portion 7; the rotor hole 1, the bottom of the large stator slot 2, the bottom of the small stator slot 4, the first arc surface 6, and the cylindrical surface tangent to the threaded hole 8 are concentrically arranged; the diameter of the first arc surface 6 is D2, and the diameter of the cylindrical surface tangent to the threaded hole 8 is D1, then D2 - D4 = D1 - D5.

[0034] As Figure 1 shown, there are four groups of small stator slot groups 19. Each group of small stator slot groups 19 has an arc surface outside. The distance between the bottom of the small stator slot 4 and the corresponding arc surface is the yoke height of the small stator slot 4. There are also four groups of large stator slot groups 3. The small stator slot groups 19 and the large stator slot groups 3 are arranged at intervals in sequence. The slot shapes and areas of all the small stator slots 4 are equal, and the slot shapes and areas of all the large stator slots 2 are equal. An installation portion 7 is provided outside each group of large stator slot groups 3, and each installation portion 7 is provided with a threaded hole 8 for fixing to the front end cover 20 of the motor. Since there is no silicon steel at the threaded hole 8, there is an air gap, the magnetic resistance is large, and the magnetic circuit will not continue to flow when it reaches the threaded hole 8. And the magnetic density is the largest at the position close to the stator slot, and it is already very small when it reaches the threaded hole 8. After being blocked by the screw at the threaded hole 8, it will not flow from the contour of the stator core 5 around the threaded hole 8. Therefore, the yoke height of the large stator slot 2 is actually only related to the position of the threaded hole 8 and has nothing to do with the contour size of the stator core 5 outside it. The present invention sets D2 - D4 = D1 - D5 in order to make the yoke height of the small stator slot 4 equal to the yoke height of the large stator slot 2.

[0035] Compared with the stepped outer core contour in the prior art, the present invention uses an arc-shaped outer contour to define the magnetic yoke height of the small stator slot 4, and defines the magnetic yoke height of the large stator slot 2 to the threaded hole 8, which substantially realizes the consistency of the magnetic yoke height of each stator slot, ensures the uniformity of the magnetic density, and reduces the vibration and noise of the motor.

[0036] The ratio of the area of ​​the small stator slot 4 to the area of ​​the large stator slot 2 is preferably 0.8-0.85. The small stator slot 4 faces the edge of the stator core 5, and the large stator slot 2 faces the top corner of the stator core 5. Such an area ratio design can achieve consistent heights of the yokes of each stator slot while keeping the top angle profile size of the stator core 5 relatively small.

[0037] Embodiment 2

[0038] On the basis of the first embodiment, the outer surface of the mounting portion 7 is set as the mounting surface of the stator core 5 and the motor rear end cover 10 in this embodiment. Since the cylindrical surface corresponding to the diameter D1 is larger than the first arc surface 6, the mounting portion 7 must protrude from the outer surface of the stator core 5. Figure 1 and Figure 2 As shown, the outer surface of the mounting portion 7 is a boss surface 9 that contacts and cooperates with the rear end cover 10 of the motor, and the buckle 11 of the rear end cover 10 is clamped on the boss surface 9. In the outer contour of the traditional square stator core 5, the arc length of the arc surface at the top corner of the stator core 5 is relatively large, so the installation contact surface area of ​​the rear end cover 10 and the stator core 5 is relatively large. If the machining accuracy of the mounting surface is not enough, it is easy to have insufficient concentricity. The design of the boss surface 9 in this embodiment can reduce the length of the matching surface between the stator core 5 and the rear end cover 10, ensure that the stator core 5 and the rear end cover 10 have better concentricity, make the air gap between the inner diameter of the stator core 5 and the outer diameter of the rotor uniform, and the air gap magnetic density is uniform, which can effectively reduce noise. At the same time, the design of the boss surface 9 increases the support length of the stator core 5 and the rear end cover 10, that is, the radial length of the buckle 11 increases, better increases the strength, effectively reduces vibration, and reduces noise.

[0039] Preferably, the end face arc length L of the boss surface 9 is 15 mm to 20 mm.

[0040] like Figure 5 As shown, the rear end of the stator core 5 is assembled with the rear end cover 10, and the wind cover 13 is sleeved on the outside of the stator core 5 and the rear end cover 10. A fan 14 is arranged in the wind cover 13 at the rear end of the rear end cover 10. After the fan 14 is started, it blows air toward the stator core 5 to cool the stator core 5. Since the boss surface 9 and the first curved surface 6 are two cylindrical surfaces with different diameters, a certain area gap channel will be left between the stator core 5 and the wind cover 13 of the motor at the outer periphery of the boss surface 9, especially at the connection between the boss surface 9 and the first curved surface 6, so that the wind can be directly blown to the outer surface of the stator core 5 without resistance, thereby increasing the flow of air volume.

[0041] Usually, the outer contour of the wind shield 13 is composed of straight edges and arc edges at the top corners, so the air volume between the first arc surface and the wind shield 13 is not very large, and the air volume mainly flows through the connection between the boss surface 9 and the first arc surface 6, such as Figure 3As shown, the convex table surface 9 is connected to the first arc surface 6 through a transition surface 15. The distance from the transition surface 15 to the center of the rotor hole 1 is less than the distance from the convex table surface 9 to the center of the rotor hole 1, so that a ventilation port 12 is formed between the transition surface 15 and the blower housing 13 of the motor. Figure 4 The path of the air flow is schematically shown in. The transition surface 15 is preferably a cutting plane. The transition surface 15 and the convex table surface 9 increase the surface area of the stator core 5, increase the heat dissipation area of the stator core 5, further reduce the temperature rise of the motor, improve the efficiency of the motor, reduce the volume, and reduce the cost.

[0042] Embodiment III

[0043] A motor, as Figure 5 shown, includes a blower housing 13, a fan 14, a rotor assembly 21, a front end cover 20, a rear end cover 10, and a stator assembly 16. The stator assembly 16 includes the stator core 5 described above. The rotor assembly 21 is located in the rotor hole 1 of the stator assembly 16, and windings are wound in the stator slots of the stator core 5.

[0044] The windings generally include a main winding 17 and an auxiliary winding 18. To ensure that the slot fill factor of each stator slot is consistent, in this embodiment, it is preferred that both the main winding 17 and the auxiliary winding 18 are set to one pair of poles and symmetrically embedded in the stator slots, and the symmetry planes of the main winding 17 and the auxiliary winding 18 are perpendicular to each other.

[0045] In this embodiment, there are four sets of large stator slot groups 3 and small stator slot groups 19 respectively. Each set of large stator slot groups 3 has four stator slots, and each small stator slot group 19 has two small stator slots 4. The main winding 17 and the auxiliary winding 18 can each have five sets of coils. As Figure 6 shown, the main winding 17 is set to one pair of poles and symmetrically embedded in the slot. Each pole includes five sets of coils. The wire embedding is from stator slot No. 1 to stator slot No. 12, from stator slot No. 2 to stator slot No. 11, from stator slot No. 3 to stator slot No. 10, from stator slot No. 4 to stator slot No. 9, from stator slot No. 5 to stator slot No. 8. The auxiliary winding 18 is also set to one pair of poles and symmetrically embedded in the slot. Each pole also includes five sets of coils. The wire embedding is from stator slot No. 7 to stator slot No. 18, from stator slot No. 8 to stator slot No. 17, from stator slot No. 9 to stator slot No. 16, from stator slot No. 10 to stator slot No. 15, from stator slot No. 11 to stator slot No. 14. The symmetry plane of the one-pair-of-poles main winding 17 and the symmetry plane of the one-pair-of-poles auxiliary winding 18 are perpendicular to each other. The windings in the small slots are separate, and in the large slots, the main and auxiliary phases share. In this way, the slot fill factor in the slots is basically the same, and the slot fill factor is about 72% - 76%. The wire embedding quality and the utilization rate of the iron core are effectively improved, the weight of the stator core 5 is reduced, and the cost is reduced.

[0046] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model 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. Therefore, it should not be construed as a limitation to the present utility model.

[0047] In addition, in the description of the present utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0048] In this specification, the schematic expression of the terms does not necessarily refer to the same embodiment. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments.

[0049] Based on the above inspiration from the ideal embodiments of the present utility model, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this utility model. The technical scope of this utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A stator core, wherein a circular rotor hole (1) is provided at the center of the stator core (5), and a plurality of stator slots are evenly distributed around the rotor hole (1), characterized in that: The stator slots include a large stator slot group (3) formed by a plurality of large stator slots (2) and a small stator slot group (19) formed by a plurality of small stator slots (4), wherein a slot bottom diameter D5 of each large stator slot (2) is greater than a slot bottom diameter D4 of each small stator slot (4); The outer contour of the stator core (5) comprises a first arcuate surface (6) located radially outside the small stator slot (4) and a mounting portion (7) located radially outside the large stator slot (2); the mounting portion (7) is provided with a threaded hole (8) axially penetrating the stator core (5); the rotor hole (1), the bottom of the large stator slot (2), the bottom of the small stator slot (4), the first arcuate surface (6) and the cylindrical surface circumscribed with the threaded hole (8) are all arranged concentrically; Assuming that the diameter of the first arcuate surface (6) is D2, and the diameter of the cylindrical surface circumscribing the threaded hole (8) is D1, then D2-D4=D1-D5.

2. The stator core according to claim 1, characterized in that: The small stator slot groups (19) are evenly arranged in four groups, and the small stator slot groups (19) and the large stator slot groups (3) are arranged in sequence and spaced apart.

3. The stator core according to claim 1, characterized in that: The outer surface of the mounting portion (7) is a boss surface (9) that contacts and cooperates with the rear end cover (10) of the motor.

4. The stator core according to claim 3, characterized in that: The end face arc length L of the boss surface (9) is 15 mm to 20 mm.

5. The stator core according to claim 1, characterized in that: The ratio of the area of ​​the small stator slot (4) to the area of ​​the large stator slot (2) is 0.8 to 0.

85.

6. The stator core according to claim 3, characterized in that: The boss surface (9) is connected to the first arc-shaped surface (6) via a transition surface (15), and the distance from the transition surface (15) to the center of the rotor hole (1) is smaller than the distance from the boss surface (9) to the center of the rotor hole (1), thereby forming a ventilation opening (12) between the transition surface (15) and the wind shield (13) of the motor.

7. The stator core according to claim 6, characterized in that: The transition surface (15) is a cutting plane.

8. A motor, characterized in that: It comprises the stator core (5) according to any one of claims 1 to 7, wherein windings are wound in stator slots of the stator core (5).

9. The motor according to claim 8, characterized in that: The winding comprises a main winding (17) and a secondary winding (18), wherein the main winding (17) and the secondary winding (18) are both arranged as a pair of poles and symmetrically embedded in the stator slots, and the symmetry planes of the main winding (17) and the secondary winding (18) are perpendicular to each other.

10. The motor according to claim 9, characterized in that: The main winding (17) and the secondary winding (18) both include five groups of coils.

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