High-speed motor

Abstract

The utility model belongs to the technical field of motors, and particularly relates to a high-speed motor, which comprises a motor body, the motor body comprises a plurality of stator punching sheets which are superposed together, the center of each stator punching sheet is provided with a first circular hole, and the edge of each stator punching sheet is provided with at least eight first hollow holes and at least eight second hollow holes. The surface of the stator punching sheet is also provided with a plurality of positioning hole groups and arc-shaped thinning area groups, each positioning hole group is composed of a square hole and a second circular hole, and each arc-shaped thinning area group is composed of a plurality of arc-shaped thinning areas. According to the high-speed motor, the structure of the existing stator punching sheet is optimally designed, so that the stator punching sheet can be effectively prevented from reversing during sheet mounting, the harmonic current and additional harmonic loss of the motor can be effectively reduced, the efficiency of the motor is improved, and meanwhile, the torque fluctuation, vibration and noise are reduced.

Description

Technical Field

[0001] This utility model belongs to the field of motor technology, specifically relating to a high-speed motor. Background Technology

[0002] High-speed motors typically refer to motors with a speed exceeding 10,000 r / min. Due to their high speed, they are much smaller in size than ordinary motors, are connected to a prime mover, eliminate the traditional reduction gear mechanism, and have low rotational inertia. Therefore, high-speed motors have advantages such as high power density, effective material saving, high transmission efficiency, low noise, and fast dynamic response.

[0003] In high-speed motors, stator laminations are core components. Generally, to prevent incorrect installation, stator laminations have an asymmetrical design between one welding slot and the others. However, in high-speed motors, where the rotational speed is extremely high, an asymmetrical design can easily lead to instability. After prolonged use, abnormal large-amplitude oscillations / vibrations may occur inside the motor, and in severe cases, even abnormal noises may develop. On the other hand, if a symmetrical design is used, with dozens or even hundreds of stator laminations inside each high-speed motor, manual installation can easily result in incorrect installation, severely impacting efficiency.

[0004] Based on this, the present utility model is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a high-speed motor to solve the above-mentioned problems.

[0006] A high-speed motor includes a motor body, the motor body including a rotor and multiple stator laminations stacked together. A first circular hole is provided in the center of each stator lamination, and at least eight first hollow holes and second hollow holes connected to the first hollow holes are provided on the edges of each stator lamination. One end of each second hollow hole extends to and is connected to the first hollow hole, and the other end of each second hollow hole extends to and is open at the edge of the stator lamination. The surface of each stator lamination also has multiple sets of positioning holes, each set consisting of square holes and second circular holes, arranged axially symmetrically. The surface of each stator lamination also has arc-shaped thinning zones corresponding to the positioning hole sets, each arc-shaped thinning zone consisting of multiple arc-shaped thinning zones located between the positioning hole sets and the first circular holes.

[0007] In a further improvement, the first hollow hole is provided with a small circular hole, a trapezoidal hole and a large circular hole in sequence in the direction away from the center of the stator lamination. The upper bottom of the trapezoidal hole is connected to the small circular hole, and the lower bottom of the trapezoidal hole is connected to the large circular hole. The diameter of the large circular hole is larger than the diameter of the small circular hole.

[0008] Further, the ratio of the diameter of the large circular hole part to the diameter of the small circular hole part is 2:1.

[0009] Further, the two sides of the second hollow hole are arc-shaped structures.

[0010] Further, the symmetry axes of all the first hollow holes pass through the center of the circle, the included angle between the symmetry axes of two adjacent first hollow holes is γ, the line connecting the center of the second circular hole and the center of the stator punching sheet is the first reference line, the included angle between the symmetry axis of the first hollow hole closest to the second circular hole and the first reference line is β, and γ=2β.

[0011] Further, the first hollow hole is provided with 18 first hollow holes, and the positioning hole group and the arc-shaped thinning area group are each provided with three groups.

[0012] Further, β=10°.

[0013] Further, the arc-shaped thinning area group is composed of three arc-shaped thinning areas, the thickness of the arc-shaped thinning area is smaller than the thickness of the stator punching sheet, and the arc lengths of the three arc-shaped thinning areas are arranged in equal proportions in the direction away from the center of the stator punching sheet.

[0014] Further, in each arc-shaped thinning area group, the three arc-shaped thinning areas are arranged at equal intervals.

[0015] Compared with the prior art, the high-speed motor has the following beneficial effects:

[0016] The high-speed motor optimizes the structure of the existing stator punching sheet, can effectively prevent the stator punching sheet from being reversed during assembly, can effectively reduce the motor harmonic current and additional harmonic loss, can improve the efficiency of the motor, can reduce the torque fluctuation, and can reduce the vibration and noise. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 Fig. 1 is a structural schematic view of the high-speed motor of the present application;

[0018] Figure 2 Fig. 2 is a structural schematic view of the stator punching sheet of the present application. DETAILED DESCRIPTION

[0019] The present application will be further described in detail below with specific examples and in combination with the drawings.

[0020] In the description of the utility model, it is necessary to explain that, unless otherwise stated, the meaning of "multiple" is two or more than two;The orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model. It is indicated or implied that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second", "third" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0021] In the description of the utility model, it is necessary to explain that, unless otherwise stated and limited, the terms "mounting", "connection", "connection" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected;It can be mechanically connected, or it can be electrically connected;It can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0022] Example 1

[0023] As Figure 1 , 2 shown, the high-speed motor comprises a motor body 10, the motor body 10 comprises a rotor 11 and a plurality of stator laminations 20 stacked together, and the central part of the stator lamination 20 is provided with a first circular hole 21.

[0024] The edge part of the stator lamination 20 is provided with at least eight first hollow holes 22 and second hollow holes 23 connected with the first hollow holes 22, one end of the second hollow hole 23 extends to the first hollow hole 22 and is in communication, and the other end of the second hollow hole 23 extends to the edge of the stator lamination 20 and is in an open state;The surface of the stator lamination 20 is also provided with a plurality of positioning hole groups, the positioning hole group is composed of a square hole 24 and a second circular hole 25, the square hole 24 and the second circular hole 25 in the positioning hole group are arranged in axial symmetry;The surface of the stator lamination 20 is also provided with an arc thinning area group corresponding to the positioning hole group, the arc thinning area group is composed of a plurality of arc thinning areas 26, and the arc thinning area group is located between the positioning hole group and the first circular hole 21.

[0025] The first hollow hole 22 is sequentially provided with a small circular hole part 223, a trapezoidal hole part 222 and a large circular hole part 221 in the direction away from the center of the stator lamination 20, the upper base of the trapezoidal hole part 222 is communicated with the small circular hole part 223, the lower base of the trapezoidal hole part 222 is communicated with the large circular hole part 221, and the diameter of the large circular hole part 221 is larger than that of the small circular hole part 223.

[0026] Further, the ratio of the diameter of the large circular hole part 221 to the diameter of the small circular hole part 223 is 2:1.

[0027] In a high-speed motor, the air gap magnetic field is not an ideal sine wave, and a large amount of harmonics is contained in the air gap magnetic field, which will affect the further improvement of the motor efficiency, and the harmonic magnetic field will also produce torque fluctuation, causing vibration and noise.

[0028] In the first hollow hole 22, the upper base of the trapezoidal hole part 222 is communicated with the small circular hole part 223, the lower base of the trapezoidal hole part 222 is communicated with the large circular hole part 221, and the setting of the second hollow hole 23 makes the air gap increase first and then gather and narrow in the direction away from the center of the stator lamination 20. With such design, the air gap magnetic field is closer to an ideal sine wave, and the harmonic content is significantly reduced.

[0029] In addition, the second hollow hole 23 can serve as a welding groove.

[0030] Most importantly, when assembling the stator lamination 20, a square sign and a round sign are used, the square hole 24 is sleeved on the square sign, the second circular hole 25 is sleeved on the round sign, and the two are left and right to ensure that the stator lamination 20 will not be reversed during assembly.

[0031] Since the square hole 24 and the second circular hole 25 are axisymmetrically designed and have the same area, the unbalanced defect can be maximally reduced.

[0032] Embodiment 2

[0033] In order to improve the welding effect, the two sides of the second hollow hole 23 are arc-shaped structures.

[0034] Embodiment 3

[0035] In embodiment 1, the first hollow hole 22 is provided with 18, and the positioning hole group and the arc-shaped thinning area group are each provided with 3 groups.

[0036] The symmetry axes of all the first hollow holes 22 pass through the center, the included angle between the symmetry axes of two adjacent first hollow holes 22 is γ, the line between the center of the second circular hole 25 and the center of the stator lamination 20 is the first reference line, and the included angle between the symmetry axis of the first hollow hole 22 closest to the second circular hole 25 and the first reference line is β.

[0037] γ = 2β. β = 10°.

[0038] Thus, the unbalance defect caused by the different shapes of the square hole 24 and the second circular hole 25 can be further reduced, the harmonic content can be further reduced, and the motor efficiency is improved.

[0039] Embodiment 4

[0040] In the embodiment 3, the arc thinning zone group is composed of three arc thinning zones 26, the thickness of the arc thinning zones 26 is less than the thickness of the stator sheet 20, and the arc lengths of the three arc thinning zones 26 are arranged in a proportionally increasing manner away from the center of the stator sheet 20.

[0041] In each arc thinning zone group, the three arc thinning zones 26 are arranged at equal intervals.

[0042] By arranging the arc thinning zone group, the unbalance defect caused by the different shapes of the square hole 24 and the second circular hole 25 can be further eliminated, the motor harmonic current and the additional harmonic loss are reduced, the motor efficiency is improved, the torque fluctuation is reduced, and the vibration and noise are reduced.

[0043] The above is only the preferred embodiment of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A high-speed motor comprising a motor body (10), the motor body (10) comprising a rotor (11) and a plurality of stator laminations (20) stacked together, the stator laminations (20) being provided with a first circular hole (21) in the center, characterized in that: the edge of the stator lamination (20) is provided with at least eight first hollow holes (22), and second hollow holes (23) connected with the first hollow holes (22), one end of the second hollow holes (23) extending to the first hollow holes (22) and being in communication, and the other end of the second hollow holes (23) extending to the edge of the stator lamination (20) and being in an open state; the surface of the stator lamination (20) is further provided with a plurality of positioning hole groups, each of which is composed of a square hole (24) and a second circular hole (25), and the square hole (24) and the second circular hole (25) in each positioning hole group are arranged in axial symmetry; the surface of the stator lamination (20) is further provided with an arc-shaped thinning area group corresponding to each positioning hole group, the arc-shaped thinning area group is composed of a plurality of arc-shaped thinning areas (26), and the arc-shaped thinning area group is located between the positioning hole group and the first circular hole (21).

2. A high speed electric machine according to claim 1, characterized in that: The first hollow hole (22) is sequentially provided with a small circular hole part (223), a trapezoidal hole part (222) and a large circular hole part (221) in the direction away from the center of the stator lamination (20), the upper base of the trapezoidal hole part (222) is in communication with the small circular hole part (223), the lower base of the trapezoidal hole part (222) is in communication with the large circular hole part (221), and the diameter of the large circular hole part (221) is greater than that of the small circular hole part (223).

3. A high speed electric machine according to claim 2, characterized in that: The ratio of the diameter of the large circular hole part (221) to the diameter of the small circular hole part (223) is 2:

1.

4. A high speed electric machine as claimed in claim 1, characterized in that: The two sides of the second hollow hole (23) are arc-shaped structures.

5. A high speed electric machine as claimed in claim 1, characterized in that: The symmetry axes of all the first hollow holes (22) pass through the center, and the included angle between the symmetry axes of two adjacent first hollow holes (22) is γ; the center line between the center of the second circular hole (25) and the center of the stator lamination (20) is a first reference line, and the included angle between the symmetry axis of the first hollow hole (22) closest to the second circular hole (25) and the first reference line is β; γ = 2β.

6. A high speed electric machine according to claim 5, characterized in that: There are 18 first hollow holes (22), and each of the positioning hole group and the arc-shaped thinning area group is provided with three groups.

7. A high speed electric machine according to claim 6, characterized in that: β＝10°。 8. A high speed electric machine as claimed in claim 1, characterized in that: Each arc-shaped thinning area group is composed of three arc-shaped thinning areas (26), the thickness of the arc-shaped thinning area (26) is less than the thickness of the stator lamination (20), and the arc lengths of the three arc-shaped thinning areas (26) are arranged in equal proportions in the direction away from the center of the stator lamination (20).

9. A high speed electric machine according to claim 8, characterized in that: In each arc-shaped thinning area group, the three arc-shaped thinning areas (26) are arranged at equal intervals.

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