A copper modified aluminum motor rotor

Abstract

The application discloses a rotor for a copper-aluminum motor, which comprises a rotor core formed by stacking a plurality of rotor laminations in an axial direction, an outer diameter of the rotor lamination is, an inner periphery of the rotor lamination is provided with rotor slots in an array, the rotor slots axially penetrate and extend along a radial direction of the rotor core, characterized in that: the inner diameter of the rotor lamination is, a slot depth of the rotor slot is, a far end of the rotor slot from an axis is a slot top, a close end of the rotor slot to the axis is a slot bottom, the slot tops of the rotor slots jointly form a slot top circle, the number of the rotor slots is, and the rotor satisfies a relationship formula: a constant coefficient is. The application has the advantages of being capable of guaranteeing product performance.

Description

Technical Field

[0001] This invention belongs to the field of motor rotor technology, and particularly relates to a rotor for a copper-to-aluminum motor. Background Technology

[0002] The rotor is the rotating part of the motor. It interacts with the rotating magnetic field generated by the stator to convert electromagnetic power into mechanical torque, which is then output to the outside through the rotating shaft.

[0003] Chinese patent application No. 202610256151.6 discloses a single-phase motor and compressor, including a stator core and a rotor core. The stator core includes stator teeth evenly distributed circumferentially, a stator yoke between adjacent stator teeth, and an open stator slot formed between adjacent stator teeth and the stator yoke. The stator slot includes a first stator slot and a second stator slot, with the cross-sectional area of ​​the first stator slot being larger than that of the second stator slot. A stator winding is embedded in the stator slot. The stator winding includes a main winding and a secondary winding; the outer circumference of the stator core has tangled straight sections; the rotor core has uniformly distributed closed rotor slots, and rotor windings are installed in the rotor slots; the inner diameter of the stator core is Rs, the outer diameter of the stator core is Rso, the axial length of the stator core is Lef, and the outer diameter of the rotor core is Rr; wherein Rs, Rr, Rso, and Lef satisfy the following condition: 0.634≤Lef / (Rs+Rr)≤0.761; 644809 ≤Lef×(Rso—Rs)2≤773771 ; 100mm≤Lef≤120mm.

[0004] Because existing rotor laminations typically use closed slots, and in the aforementioned technical solutions, the outer diameter, number of slots, slot profile, and wall thickness (i.e., magnetic bridge thickness) of the rotor lamination are configured as relatively independent dimensions, which are then produced by the die tooling. Since these parameters are unrelated, the design of any single parameter will lead to uncontrollable magnetic bridge thickness. When it is too thick, the leakage flux of the closed slot increases with the increase in magnetic bridge thickness, weakening the power factor and starting / overload torque margin, resulting in a decrease in product performance. When it is too thin, under the superposition of mass production tolerances, local bridge arches are prone to become thinner, resulting in uneven air gaps, increased radial force waves, and excessive electromagnetic noise / vibration. Summary of the Invention

[0005] To address the shortcomings of existing technologies, a rotor for copper-to-aluminum motors is provided.

[0006] The present invention is implemented using the following technical solutions:

[0007] A rotor for a copper-to-aluminum electric motor includes a rotor core formed by stacking multiple rotor laminations along the axial direction, wherein the outer diameter of the rotor laminations is [missing information]. The rotor lamination has circumferentially arranged rotor slots, which axially penetrate and extend radially along the rotor core. The inner diameter of the rotor lamination is... The depth of the rotor slot is The end of the rotor slot furthest from the shaft is the slot top, and the end closest to the shaft is the slot bottom. The slot tops together form a slot top circle. The number of rotor slots is... The Satisfying the relation: ,in, is a constant coefficient.

[0008] Preferably, the cross-sectional shape of the rotor slot gradually widens from the inner side of the rotor core to the outer side to form a fan-shaped structure.

[0009] Preferably, the top of the groove is a first circular arc with a complete arc shape and a central angle of less than 180°.

[0010] Preferably, the apexes of the first arc are combined to form the top circle of the groove.

[0011] Preferably, the bottom of the rotor slot is formed by a second circular arc, which is a complete arc structure with a central angle of less than or equal to 180°.

[0012] Preferably, the apex of the second arc is combined to form the bottom circle of the groove.

[0013] Preferably, the inner diameter of the rotor lamination... Satisfying the relation: 10mm 20mm.

[0014] Preferably, the groove depth of the rotor slot is... Satisfying the relation: 8mm 9mm.

[0015] Preferably, the constant coefficient The relation is satisfied: 4.87 4.91.

[0016] Preferably, the outer diameter of the rotor lamination Satisfying the relation: 44mm 54mm.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] By incorporating parameters such as the outer diameter of the rotor laminations, the number of rotor slots, the diameter of the slot top circle, and the center-to-center distance between slot tops into a single display formula, collaborative constraints are achieved. This avoids increased leakage flux and decreased power factor due to an excessively thick magnetic bridge, or uneven air gap and excessive electromagnetic noise due to an excessively thin magnetic bridge. This solves the problem of uncontrollable magnetic bridge thickness caused by the independent selection of a single parameter, thus ensuring product performance. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall rotor structure for a copper-to-aluminum electric motor according to the present invention;

[0020] Figure 2 This is a schematic diagram of the structural parameters of the product DD-A.

[0021] Figure 3 This is a schematic diagram of the structural parameters of product DD-B;

[0022] Figure 4 The efficiency-torque characteristic diagrams for products DD-A and DD-B are shown.

[0023] Reference numerals: 1. Rotor lamination; 2. Rotor core; 3. Rotor slot; 31. Slot top; 311. First arc; 32. Slot bottom; 321. Second arc. Detailed Implementation

[0024] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0025] like Figure 1 As shown, this embodiment discloses a rotor for a copper-to-aluminum motor, comprising a rotor core 2 formed by stacking multiple rotor laminations 1 along the axial direction, wherein the outer diameter of the rotor laminations 1 is [missing information]. The rotor lamination 1 has rotor slots 3 arranged in a circumferential array. The rotor slots 3 penetrate axially and extend radially along the rotor core 2. The inner diameter of the rotor lamination 1 is [missing information]. The depth of rotor slot 3 is The end of rotor slot 3 furthest from the shaft center is the slot top 31, and the end closest to the shaft center is the slot bottom 32. The slot tops 31 of rotor slot 3 together form a slot top circle. The number of rotor slots 3 is... , Satisfying the relation: ,in, is a constant coefficient.

[0026] The cross-sectional shape of the rotor slot 3 gradually widens from the inner side of the rotor core 2 to the outer side to form a fan-shaped structure.

[0027] At the top of the groove, 31 is a first circular arc 311 in a complete arc shape, with a central angle of less than 180°.

[0028] The apex of the first arc 311 is combined to form the top circle of the groove.

[0029] The bottom 32 of the rotor slot 3 is formed by the second arc 321, which is a complete arc structure with a central angle of less than or equal to 180°.

[0030] The apex of the second arc 321 is combined to form the bottom circle of the groove.

[0031] outer diameter of rotor lamination 1 Satisfies the relationship: 44mm < < 54mm; Inner diameter of rotor lamination 1 Satisfying the relationship: 10mm < < 20mm.

[0032] The depth of rotor slot 3 Satisfying the relationship: 8mm < < 9mm.

[0033] constant coefficient Satisfies the relation: 4.87 < < 4.91.

[0034] like Figure 4 As shown, this test uses existing high-precision torque and speed sensors and power analyzers, combined with finite element electromagnetic simulation (using ANSYS Maxwell software), and is conducted according to the national standard GB / T22669-2008. The efficiency-torque characteristic curve is obtained by actual measurement using the single-phase asynchronous motor test method.

[0035] like Figure 2 As shown, this product is designated as Product DD-A. The specific parameters of Product DD-A are: the outer diameter of rotor lamination 1. The inner diameter of rotor lamination 1 is 49.27 mm. The depth of rotor slot 2 is 14.3 mm. The diameter of the groove bottom circle is 8.45mm. The diameter is 32.1 mm, and the number of rotor slots 2 is... There are 26 slots, and the spacing between the sidewalls of two adjacent rotor slots 22 is... It is 2.45mm.

[0036] like Figure 3 As shown, product DD-B is an existing product submitted for inspection. The specific parameters of product DD-B are: the outer diameter of rotor lamination 1. The inner diameter of rotor lamination 1 is 49.61 mm. The depth of rotor slot 2 is 12.99 mm. The diameter of the groove bottom circle is 8mm. The diameter is 33mm, and the number of rotor slots 2 is... There are 26 slots, and the spacing between the sidewalls of two adjacent rotor slots 22 is... It is 2.5mm.

[0037] Among them, the chamfer radius of the side wall of rotor slot 2 of product DD-B is 0.84mm on the side closer to the shaft and 1.52mm on the side farther from the shaft.

[0038] like Figure 4 As shown, the horizontal axis represents the motor operating time, the vertical axis represents the motor efficiency, the red line represents the data measured by this product, and the blue line represents the data measured by the submitted product. The voltage used for testing is 380V. The motor efficiency of this product DD-A is generally higher than that of the submitted product DD-B.

Claims

1. A rotor for a copper-to-aluminum electric motor, comprising a rotor core formed by stacking multiple rotor laminations along an axial direction, wherein the outer diameter of the rotor laminations is... The rotor laminations are provided with rotor slots arranged in a circumferential array, the rotor slots extending axially through and along the radial direction of the rotor core, characterized in that: The inner diameter of the rotor lamination is The depth of the rotor slot is The end of the rotor slot furthest from the shaft is the slot top, and the end closest to the shaft is the slot bottom. The slot tops together form a slot top circle. The number of rotor slots is... The Satisfying the relation: ,in, These are constant coefficients.

2. The rotor for a copper-to-aluminum motor according to claim 1, characterized in that: The cross-sectional shape of the rotor slot gradually widens from the inner side of the rotor core to the outer side to form a fan-shaped structure.

3. The rotor for a copper-to-aluminum motor according to claim 2, characterized in that: The top of the groove is a first circular arc in a complete arc shape, with a central angle of less than 180°.

4. The rotor for a copper-to-aluminum motor according to claim 2, characterized in that: The apexes of the first circular arc combine to form the top circle of the groove.

5. A rotor for a copper-to-aluminum motor according to claim 1, characterized in that: The bottom of the rotor slot is formed by a second circular arc, which is a complete arc structure with a central angle of less than or equal to 180°.

6. A rotor for a copper-to-aluminum motor according to claim 3, characterized in that: The apex of the second arc together form the bottom circle of the groove.

7. The rotor for a copper-to-aluminum motor according to claim 1, characterized in that: The inner diameter of the rotor lamination Satisfying the relation: 10mm 20mm.

8. The rotor for a copper-to-aluminum motor according to claim 1, characterized in that: The depth of the rotor slot Satisfying the relation: 8mm 9mm.

9. A rotor for a copper-to-aluminum motor according to claim 1, characterized in that: The constant coefficient The relation is satisfied: 4.87 4.

91.

10. A rotor for a copper-to-aluminum motor according to claim 3, characterized in that: The outer diameter of the rotor lamination Satisfying the relation: 44mm 54mm.

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