A high performance rotor

Abstract

The application discloses a high-performance rotor, 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 circumferential array of the rotor lamination is provided with a rotor slot, the rotor slot axially penetrates and extends along a radial direction of the rotor core, characterized in that: the number of the rotor slots is, the wall thickness of the rotor is, one end of the rotor slot away from an axis is a slot top, one end of the rotor slot close to the axis is a slot bottom, the slot tops of the rotor slots jointly form a slot top circle, the diameter of the slot top circle is, the center distance between the slot tops of two adjacent rotor slots is, and the following relationship is satisfied: the application has the advantages that the product performance can be guaranteed.

Description

Technical Field

[0001] This invention belongs to the field of motor rotor technology, and particularly relates to a high-performance rotor. 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 high-performance rotor is provided.

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

[0007] A high-performance rotor includes a rotor core formed by stacking multiple rotor laminations along an axial direction, wherein the outer diameter of the rotor laminations is [missing information]. The rotor laminations are arranged with rotor slots in a circumferential array. These slots axially penetrate the rotor core and extend radially. The number of rotor slots is [number missing]. The wall thickness of the rotor 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 diameter of which is [missing information]. The The center-to-center distance between the tops of two adjacent rotor slots is The Satisfying the relation: .

[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, two inclined shoulders are symmetrically provided at the top of the slot along the center line of the single rotor slot, and the two inclined shoulders are connected by a first circular arc transition, and the inclined shoulders and the side wall of the corresponding rotor slot are connected by a second circular arc transition.

[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 third circular arc, which is a complete arc structure with a central angle of less than 180°.

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

[0013] Preferably, the number of rotor slots Greater than or equal to 35.

[0014] Preferably, the groove top circle Satisfies the relation: 98.2mm 98.6mm.

[0015] Preferably, the sidewalls of two adjacent rotor slots are parallel to each other, and the distance between them is [missing information]. The Satisfies the relation: 3.28mm 3.32mm.

[0016] Preferably, the aspect ratio of the sloping shoulder is less than 1.

[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. It 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 structure of a high-performance rotor according to the present invention;

[0020] Figure 2 This is a schematic diagram showing the structural parameters of product CX-342;

[0021] Figure 3 for Figure 2 A partially enlarged structural diagram of adjacent rotor slots;

[0022] Figure 4 This is a schematic diagram of the structural parameters of product LK-342;

[0023] Figure 5 for Figure 4 A partially enlarged structural diagram of adjacent rotor slots;

[0024] Figure 6 The efficiency-torque characteristic diagrams for products CX-342 and LK-342 are shown.

[0025] Reference numerals: 1. Rotor lamination; 2. Rotor slot; 20. Shoulder; 21. First arc; 22. Second arc; 23. Third arc; 24. Lateral slot wall. Detailed Implementation

[0026] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0027] like Figure 1 As shown, this embodiment discloses a high-performance rotor, including a rotor core 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 2 arranged in a circumferential array. The rotor slots 2 penetrate axially and extend radially along the rotor core. The number of rotor slots 2 is [number missing]. The rotor wall thickness is The end of rotor slot 2 furthest from the shaft is the slot top, and the end closest to the shaft is the slot bottom. The tops of rotor slot 2 together form a slot top circle, the diameter of which is... , The center-to-center distance between the tops of two adjacent rotor slots 2 is , Satisfying the relation: .

[0028] The cross-sectional shape of the rotor slot 2 gradually widens from the inner side of the rotor core to the outer side to form a fan-shaped structure. Two inclined shoulders 20 are symmetrically provided at the top of the slot along the center line of the single rotor slot 2. The height-to-width ratio of the inclined shoulders 20 is less than 1. The two inclined shoulders 20 are connected by a first circular arc 21. The inclined shoulders 20 are connected by a second circular arc 22 to the side wall 24 of the corresponding rotor slot 2. The bottom of the slot is formed by a third circular arc 23. The third circular arc 23 is a complete arc structure with a central angle of less than 180°.

[0029] The first arc 21 has a width of 0.56 mm. The first arc 21 is directly connected to the two side shoulders 20 or transitioned through a chamfer with a radius of 0.1 mm. The second arc 22 has a radius of 0.4 mm, and the third arc 23 has a radius of 0.66 mm.

[0030] The apexes of the first arc 21 combine to form the top circle of the groove; the apexes of the third arc 23 combine to form the bottom circle of the groove, the diameter of which is... It is 60.4mm.

[0031] Number of rotor slots 2 The outer diameter of rotor lamination 1 is greater than or equal to 35. It is 98.815mm.

[0032] The lateral slot walls 24 of two adjacent rotor slots 2 are parallel to each other, and the distance between them is [missing information]. , Satisfies the relation: 3.28mm 3.32mm.

[0033] like Figure 5 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 an experimental bench built according to the national standard GB / T22669-2008 "Test Method for Three-Phase Permanent Magnet Synchronous Motors", to obtain the efficiency-operating time characteristic curve.

[0034] like Figure 2 , Figure 3 As shown, this product is designated as product CX-342. The specific parameters of product CX-342 are: the outer diameter of rotor lamination 1. The inner diameter of rotor lamination 1 is 98.815 mm. The diameter of the groove top circle is 44.455mm. The diameter is 98.36 mm, and the number of rotor slots 2 is... There are 42, with a bottom circle diameter of [missing information]. The distance between the sidewalls of two adjacent rotor slots 22 is 60.4 mm. The center-to-center distance between the tops of two adjacent rotor slots 2 is 3.3 mm. It is 7.35mm.

[0035] like Figure 4 As shown, product LK-342 is an existing product submitted for inspection. The rotor slot 2 of product LK-342 has a cross-sectional shape without a sloping shoulder 20. Its specific parameters are: the outer diameter of the rotor lamination 1... The inner diameter of rotor lamination 1 is 98.615 mm. It is 44.455mm Diameter of the top circle of the groove The diameter is 97.96 mm, and the number of rotor slots 2 is... There are 42, with a bottom circle diameter of [missing information]. The distance between the sidewalls of two adjacent rotor slots 22 is 60.4 mm. The center-to-center distance between the tops of two adjacent rotor slots 2 is 3.3 mm. It is 7.05mm.

[0036] Among them, the chamfer radius of the side wall of rotor slot 2 of product LK-342 is 0.2mm on the side closer to the shaft and 1.5mm on the side farther from the shaft.

[0037] like Figure 5 As shown, the horizontal axis represents the motor operating time, and 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 CX-342 is generally higher than that of the submitted product LK-342.

Claims

1. A high-performance rotor, 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 number of rotor slots is The wall thickness of the rotor 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 diameter of which is [missing information]. The The center-to-center distance between the tops of two adjacent rotor slots is The Satisfying the relation: .

2. The high-performance rotor 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. A high-performance rotor according to claim 2, characterized in that: Two inclined shoulders are symmetrically provided at the top of the slot along the center line of the single rotor slot. The two inclined shoulders are connected by a first circular arc transition, and the inclined shoulders are connected to the side wall of the corresponding rotor slot by a second circular arc transition.

4. A high-performance rotor 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 high-performance rotor according to claim 1, characterized in that: The bottom of the rotor slot is formed by a third circular arc, which is a complete arc structure with a central angle of less than 180°.

6. A high-performance rotor according to claim 3, characterized in that: The apex of the third arc is combined to form the bottom circle of the groove.

7. A high-performance rotor according to claim 1, characterized in that: The number of rotor slots Greater than or equal to 35.

8. A high-performance rotor according to claim 1, characterized in that: The top circle of the groove Satisfies the relation: 98.2mm 98.6mm.

9. A high-performance rotor according to claim 1, characterized in that: The sidewalls of two adjacent rotor slots are parallel to each other, and the distance between them is [missing information]. The Satisfies the relation: 3.28mm 3.32mm.

10. A high-performance rotor according to claim 3, characterized in that: The aspect ratio of the sloping shoulder is less than 1.

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