Rotor punching sheet and motor

Abstract

The utility model relates to a rotor punching sheet and a motor, and the rotor punching sheet comprises a shaft hole which is disposed in the central region of the rotor punching sheet; the 40 rotor slots are arranged around the shaft hole and respectively extend in the radial direction of the rotor punching sheet, each rotor slot comprises a radial inner slot section which is arranged close to the shaft hole, the outline of the radial inner slot section is gradually narrowed towards the shaft hole, the first end, close to the shaft hole, of the radial inner slot section is closed by a first arc, and the second end, far away from the shaft hole, of the radial inner slot section is provided with a second arc; the second arc has an opening; the radial middle groove section is communicated with the opening of the radial inner groove section; the radial outer groove section is arranged to be far away from the shaft hole and communicate with the radial middle groove section, the radial outer groove section is closed by a third arc, the diameter a of the first arc is 2.3 < = a < = 2.5 mm or 2.7 < = a < = 4.4 mm, the diameter b of the second arc is 5 < = b < = 6.3 mm, and the diameter c of the third arc is 6 < = c < = 8.4 mm. The rotor punching sheet provided by the utility model can reduce the rotor loss and improve the electrical performance of a motor.

Description

Technical Field

[0001] The utility model relates to a rotor punching sheet and a motor. Background Art

[0002] Motors are widely used in various fields. As an important component of three-phase asynchronous motors, the motor rotor is formed by stacking rotor laminations. The design of the rotor directly affects the performance of the motor. The current three-phase asynchronous AC motors generally use 48 slots / 36 slots for the stator and rotor, but the performance of this type of motor is low and the cost of manufacturing this type of motor is wasted. Therefore, it is necessary to provide a new type of rotor lamination to improve the various performances of the motor and reduce the manufacturing cost. Utility Model Content

[0003] In view of this, the embodiment of the utility model proposes a new rotor punching and a motor including the rotor punching. In the utility model, the stator and rotor slot matching is changed to 48 slots / 40 slots, and the rotor slot type is optimized, which can save copper wire and reduce the cost of the motor without changing the motor performance.

[0004] According to a preferred embodiment of the utility model, a rotor punching is provided on one hand, the rotor punching comprises: an axial hole, which is arranged in the central area of ​​the rotor punching; and 40 rotor slots, which are arranged around the axial hole and extend in the radial direction of the rotor punching respectively, each rotor slot comprises: a radial inner slot segment, which is arranged close to the axial hole, the profile of the radial inner slot segment gradually narrows toward the axial hole, the first end of the radial inner slot segment close to the axial hole is closed by a first arc, and the second end of the radial inner slot segment away from the axial hole has a second arc, and the second arc includes the axial Two symmetrical sections, the two sections are located on the same arc, and the second arc has an opening; a radial middle slot section, which is connected to the opening of the radial inner slot section; and a radial outer slot section, which is arranged away from the shaft hole and connected to the radial middle slot section, and the radial outer slot section is closed by a third arc, the diameter a of the first arc is 2.3mm≤a≤2.5mm or 2.7mm≤a≤4.4mm, the diameter b of the second arc is 5mm≤b≤6.3mm, and the diameter c of the third arc is 6mm≤c≤8.4mm. In a preferred embodiment, the diameter of the first arc is 2.3mm, the diameter of the second arc is 6mm, and the diameter of the third arc is 7.3mm. The first arc, the second arc and the third arc are formed at one time when 40 rotor slots are punched on the material by a die at the same time. According to the rotor punching sheet of the utility model, the number of rotor slots of 40 slots is replaced by the number of rotor slots of 36 slots in the existing rotor, and the rotor slot type size is adjusted, so that the rotor resistance becomes smaller and the additional loss is reduced.

[0005] According to the exemplary embodiment of the utility model, the radial middle slot section of the rotor slot of the rotor punching sheet is composed of two straight line segments extending parallel to the radial direction. By improving the slot shape of the rotor punching sheet, the loss of the rotor made of the rotor punching sheet is reduced, the electrical performance of the motor using the rotor is improved, and the cost of the motor is saved.

[0006] According to an exemplary embodiment of the present invention, the rotor slots of the rotor punching sheet have an axis extending in the radial direction and are symmetrical about the axis, which facilitates the manufacture of the rotor punching sheet and advantageously reduces the manufacturing cost.

[0007] According to an exemplary embodiment of the utility model, the radially outer slot segment of the rotor slot of the rotor punching sheet has a smaller radially extending dimension than the radially inner slot segment, which reduces the loss of the rotor made of the rotor punching sheet of the utility model and improves the performance of the motor using the rotor made of the rotor.

[0008] According to a preferred embodiment of the present invention, in another aspect, a motor is provided, the motor comprising a rotor, wherein the rotor comprises a plurality of rotor punchings stacked together, each rotor punching being a rotor punching according to the above description. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so that those skilled in the art will be more aware of the above and other features and advantages of the present invention. In the accompanying drawings:

[0010] Figure 1 A schematic diagram of a rotor punching according to the utility model is shown.

[0011] Figure 2 A schematic diagram showing a rotor slot of a rotor punching according to the utility model is shown.

[0012] The reference numerals are as follows:

[0013] Label meaning 10 Shaft hole 20 Rotor slot 100 Rotor punching 21 Radial inner groove section 22 Radial middle slot 23 Radial outer groove segment a The diameter of the first arc b The diameter of the second arc c The diameter of the third arc DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail with reference to the following embodiments.

[0015] Figure 1 FIG. 2 shows a schematic diagram of a rotor punching according to the utility model. Figure 1As shown, the rotor punching 100 according to the utility model is designed to have a circular shape, and the rotor punching 100 includes an axial hole 10 and 40 rotor slots 20, wherein the axial hole 10 is arranged in the central area of ​​the rotor punching 100, and the 40 rotor slots 20 are evenly arranged around the axial hole 10 and extend in the radial direction of the rotor punching 100 respectively.

[0016] Figure 2 The schematic diagram of the rotor slots of the rotor punching according to the utility model is shown. According to the prior art, the rotor punching of the three-phase asynchronous motor adopts 36 slots, and the slot type of the rotor slot is designed by arcs with diameters of 2.6mm, 6.4mm and 8.5mm respectively. Figure 2 In the illustrated embodiment, the rotor plate has 40 rotor slots 20 , and each rotor slot 20 has an axis extending in the radial direction and is symmetrical about the axis.

[0017] Each rotor slot 20 of the rotor punching according to this embodiment includes a radial inner slot segment 21, a radial middle slot segment 22 and a radial outer slot segment 23. Specifically, the radial inner slot segment 21 is arranged close to the shaft hole 10, and the profile of the radial inner slot segment 21 gradually narrows toward the shaft hole 10. The first end of the radial inner slot segment 21 close to the shaft hole 10 is closed by a first arc, and the diameter a of the first arc is 2.3mm≤a≤2.5mm or 2.7mm≤a≤4.4mm. In a preferred embodiment, a is 2.3mm. The second end of the radial inner slot segment 21 away from the shaft hole 10 has a second arc, which includes two axially symmetrical segments, which are located on the same arc, and the diameter b of the second arc is 5mm≤b≤6.3mm. In a preferred embodiment, b is 6mm, and the second arc has an opening. The radial middle slot segment 22 is connected to the opening of the radial inner slot segment 21, wherein in this embodiment, the radial middle slot segment 22 is composed of two straight line segments extending parallel to the radial direction. The radial outer slot segment 23 is arranged away from the shaft hole 10 and communicates with the radial middle slot segment 22. The radial outer slot segment 23 is closed by a third arc, and the diameter c of the third arc is 6 mm ≤ c ≤ 8.4 mm. In a preferred embodiment, c is 7.3 mm. The first arc, the second arc and the third arc of the rotor slot 20 are formed at one time when 40 rotor slots are punched on the material by a die. The radial outer slot segment 23 has a dimension extending in the radial direction that is smaller than the radial inner slot segment 21.

[0018] See Table 1, which shows the comparison of the electrical performance of the motor obtained by using rotor punchings according to the embodiment of the utility model and the industry standard and the prior art:

[0019]

[0020]

[0021] Table 1

[0022] In Table 1, "power factor" indicates the ratio of the actual power of the motor to the nominal power; "motor efficiency" indicates the ratio of the output power of the motor to the input power; "winding temperature rise" indicates the difference between the operating temperature of the motor winding and the ambient temperature; "starting torque multiple" indicates the ratio of the starting torque of the motor to the rated torque; and "starting current multiple" indicates the ratio of the starting current to the rated current. Compared with the motor using the industry standard or the motor using the 36-slot rotor punching, the motor performance is optimized by using the rotor punching of the embodiment of the utility model, effectively improving the power factor and motor efficiency, reducing the motor temperature rise, improving the motor starting torque multiple, and increasing the starting current multiple, thereby reducing the rotor loss and additional loss of the motor by optimizing the motor rotor slot type.

[0023] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0024] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0025] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A rotor punching sheet (100), characterized in that: The rotor punching sheet (100) comprises: An axial hole (10) is arranged in a central area of ​​the rotor punching sheet (100); and 40 rotor slots (20) are arranged around the shaft hole (10) and extend in the radial direction of the rotor punching sheet (100), respectively. Wherein, each of the rotor slots (20) comprises: a radial inner groove segment (21) arranged close to the shaft hole (10), the profile of the radial inner groove segment (21) gradually narrowing toward the shaft hole (10), a first end of the radial inner groove segment (21) close to the shaft hole (10) being closed by a first circular arc, and a second end of the radial inner groove segment (21) far from the shaft hole (10) being provided with a second circular arc, wherein the second circular arc has an opening; a radial middle slot section (22) communicating with the opening of the radial inner slot section (21); and a radial outer groove segment (23) arranged away from the shaft hole (10) and connected to the radial middle groove segment (22), wherein the radial outer groove segment (23) is closed by a third circular arc, The diameter a of the first circular arc is 2.3 mm ≤ a ≤ 2.5 mm or 2.7 mm ≤ a ≤ 4.4 mm, the diameter b of the second circular arc is 5 mm ≤ b ≤ 6.3 mm, and the diameter c of the third circular arc is 6 mm ≤ c ≤ 8.4 mm.

2. The rotor punching sheet (100) according to claim 1, characterized in that: The diameter a of the first arc is 2.3 mm, the diameter b of the second circular arc is 6 mm, and the diameter c of the third circular arc is 7.3 mm.

3. The rotor punching sheet (100) according to claim 1, characterized in that: The radial middle groove section (22) is composed of two straight line sections extending parallel to the radial direction.

4. The rotor punching sheet (100) according to claim 1, characterized in that: The rotor slot (20) has an axis extending in the radial direction and is symmetrical about the axis.

5. The rotor punching sheet (100) according to claim 1, characterized in that: The dimension of the radially outer groove segment (23) extending along the radial direction is smaller than the dimension of the radially inner groove segment (21) extending along the radial direction.

6. A motor, characterized in that: A rotor is provided, wherein the rotor comprises a plurality of rotor sheets (100) stacked together, each of the rotor sheets (100) being a rotor sheet (100) according to any one of claims 1 to 5.

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