A rotor, a motor and a compressor

Abstract

The present invention provides a rotor, wherein the rotor has a plurality of rotor slots, rotor aluminum bars are arranged in the rotor slots, the rotor aluminum bars include upper aluminum bars and lower aluminum bars, the upper aluminum bars are connected in series with the lower aluminum bars, and the rotor resistance is controlled by controlling the cross-sectional area S of the rotor aluminum bars and the height L of the rotor aluminum bars. The plurality of rotor slots and the rotor have two included angles α1 and α2 in the axial direction. The rotor of the present invention realizes effective control of the rotor resistance, can reduce the rotor magnetic density, and improve the starting ability of the motor; can reduce the resonance noise and electromagnetic noise generated due to large motor harmonics in the compressor industry; can strengthen the stability of the aluminum bar structure and reduce the fracture of the rotor aluminum bars.

Description

Technical Field

[0001] The present invention relates to the field of compressor motors, and particularly to a rotor, a motor, and a compressor thereof. Background Art

[0002] In the traditional compressor motor industry, under the operating voltages of x power supply (rated power supply is 115V / 60HZ) and r power supply (rated power supply is 208 - 230V / 60HZ), due to the system working conditions and the resistance torque of the compressor pump body, it is easy to have a small starting torque of the motor, resulting in the problem that the motor cannot start. At present, the main solutions in the industry are to increase the capacitance structurally or to increase the effective number of turns of the stator secondary phase and reduce the turns ratio of the main and secondary phases on the stator. Both of these solutions increase the starting torque of the motor at the cost of sacrificing the motor efficiency.

[0003] Patent No. CN112311112A discloses a rotor punching sheet, a rotor core, and a motor rotor thereof. Although this punching sheet can improve the starting ability of the motor, it increases the rotor leakage magnetic flux, increases the rotor aluminum loss, and has a low overall structural strength and poor noise and vibration performance.

[0004] Patent No. CN212543473U discloses a rotor punching sheet, which mainly solves the problem of the outward bulge of the arc-shaped groove top and has limited improvement in rotor resistance and rotor starting ability. Summary of the Invention

[0005] In order to overcome the above-mentioned drawbacks of the prior art, the purpose of the present invention is to provide a rotor that can effectively solve the above problems.

[0006] The technical solution adopted by the present invention to solve its technical problems is:

[0007] A rotor, wherein the rotor has a plurality of rotor slots, rotor aluminum bars are arranged in the rotor slots, the rotor aluminum bars include an upper aluminum bar and a lower aluminum bar, the upper aluminum bar and the lower aluminum bar are arranged in sequence along the axial direction of the rotor, the upper aluminum bar and the lower aluminum bar are connected in series, and the rotor resistance is controlled by controlling the cross-sectional area S of the rotor aluminum bar and the height L of the rotor aluminum bar. The plurality of rotor slots and the rotor have two included angles α1 and α2 along the axial direction.

[0008] As a further improvement of the invention: the resistance formula of the rotor aluminum bar is The ratio of the cross-sectional area S of the rotor aluminum bar to the height L of the rotor aluminum bar is The height of the upper aluminum bar is L1, the height of the lower aluminum bar is L2, the cross-sectional area S of the rotor aluminum bar has an integral non-linear relationship with the height L1 of the upper aluminum bar and the height L2 of the lower aluminum bar respectively, and the height ratio of the upper aluminum bar to the lower aluminum bar is

[0009] As a further improvement of the invention: the K value changes the total resistance of the rotor aluminum bars, and when K = 1, the resistance of the rotor aluminum bars is the largest.

[0010] As a further improvement of the invention: the angle α1 at the upper aluminum bar is equal to the angle α1 at the lower aluminum bar, and the angle α2 at the upper aluminum bar is equal to the angle α2 at the lower aluminum bar.

[0011] As a further improvement of the invention: the angle α1 satisfies 2.5° ≤ α1 ≤ 3.5°, and the angle α2 satisfies 2.5° ≤ α2 ≤ 3.5°.

[0012] As a further improvement of the invention: the groove type of the rotor slots is straight slots, and the bottoms of the several rotor slots are all tangent to the inner circle of the rotor, and the tops of the several rotor slots are all tangent to the outer circle of the rotor.

[0013] As a further improvement of the invention: the rotor slots have an upper slot body for placing the upper aluminum bar and a lower slot body for placing the lower aluminum bar, and the radial areas of the upper slot body and the lower slot body are different.

[0014] As a further improvement of the invention: it further includes a rotor core, which is composed of several rotor punching sheets stacked and pressed in a reduced or enlarged proportion, and the rotor core is fastened by a snap connection method.

[0015] The present invention also provides a motor, wherein the rotor is the above-mentioned rotor.

[0016] The present invention also provides a compressor, wherein the rotor is the above-mentioned rotor.

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

[0018] The rotor of the present invention realizes effective control of the rotor resistance, can reduce the rotor magnetic density, and improve the starting ability of the motor; can reduce the resonance noise and electromagnetic sound generated due to large motor harmonics in the compressor industry; can strengthen the stability of the aluminum bar structure and reduce the fracture of the rotor aluminum bars. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a side structural sectional view of the present invention.

[0020] Figure 2 It is a front structural sectional view of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0021] Now, the present invention will be further described in conjunction with the drawings and embodiments:

[0022] As shown in the attached Figure 1 to the attached Figure 2As shown, a rotor, wherein the rotor has a plurality of rotor slots 1, and rotor aluminum bars 2 are arranged in the rotor slots 1. The rotor aluminum bars 2 include an upper aluminum bar 21 and a lower aluminum bar 22. The upper aluminum bar and the lower aluminum bar are arranged in sequence along the axial direction of the rotor. The upper aluminum bar 21 is in series with the lower aluminum bar 22. The rotor resistance is controlled by controlling the cross-sectional area S of the rotor aluminum bar 2 and the height L of the rotor aluminum bar 2. The plurality of rotor slots 1 and the rotor have two included angles α1 and α2 along the axial direction.

[0023] The present invention adopts a controllable aluminum bar structure, which is set into two parts, an upper aluminum bar 21 and a lower aluminum bar 22. The plurality of rotor slots 1 have different sizes to achieve controlling the area of the aluminum bar through which the current passes by different sizes of the rotor slots 1.

[0024] As shown in the appended Figure 1 to the appended Figure 2 As shown, the resistance formula of the rotor aluminum bar 2 is The ratio of the cross-sectional area S of the rotor aluminum bar 2 to the height L of the rotor aluminum bar 2 is The cross-sectional area S of the rotor aluminum bar is in an integral non-linear relationship with the height L1 of the upper aluminum bar and the height L2 of the lower aluminum bar respectively. The height ratio of the upper aluminum bar 21 to the lower aluminum bar 22 is The height of the upper aluminum bar 21 is L1, and the height of the lower aluminum bar 22 is L2.

[0025] Integral Nonlinearity (INL) is one of the static performance parameters of an analog-to-digital converter, which refers to the difference between the actual conversion curve and the ideal conversion curve in the vertical axis direction, with the unit of LSB, that is, the least significant bit. It represents the degree to which the actual conversion curve deviates from the ideal conversion curve. In the electrical engineering industry, integral non-linearity is the ability of a data converter to approach the slope of the ideal transfer function. It can be defined by connecting the endpoints or the best straight-line fitting method.

[0026] First, the resistance of the rotor aluminum bar 2 satisfies the formula S is the cross-sectional area of the rotor aluminum bar 2, L is the height of the rotor aluminum bar 2, and p is the resistivity of the aluminum bar 2. Since the cross-sectional area S of the rotor aluminum bar and the height L of the rotor aluminum bar satisfy: S l1 is the cross-sectional area height of the upper aluminum bar at a certain height, and S max is the maximum cross-sectional area height of the upper aluminum bar. From this, it can be known that the cross-sectional area S of the rotor aluminum bar and the height L of the rotor aluminum bar are in a non-linear ratio. Therefore, the cross-sectional area S of the rotor aluminum bar 2 and the height L of the aluminum bar are in an integral non-linear relationship.

[0027] As shown in the appended Figure 1 to the appended Figure 2As shown, the K value can change the total resistance of the rotor aluminum bars 2, and when K = 1, the resistance of the rotor aluminum bars 2 is the largest. Increasing the resistance of the rotor aluminum bars 2 can reduce the rotor magnetic density during operation, achieving the purpose of increasing the starting torque of the motor.

[0028] The heights L1 of the upper aluminum bars 21 and L2 of the lower aluminum bars 22 can be set inconsistently. The height of the rotor core 3 is the sum of the height L1 of the upper aluminum bars 21 and the height L2 of the lower aluminum bars 22. Since the materials and densities of the upper and lower aluminum bars are the same, only the cross-sectional area of the aluminum bars is different from the height of the rotor aluminum bars, and the cross-sectional area of the aluminum bars has a non-linear integral relationship with the height of the rotor aluminum bars. It is easy to obtain that the resistance R1 of the upper aluminum bars and the resistance R2 of the lower aluminum bars satisfy: That is, they are in an inverse proportion relationship. By controlling the K values of the upper and lower aluminum bars, the effect of controlling the rotor resistance can be indirectly achieved, reducing the rotor air-gap magnetic density, and thus effectively increasing the starting torque of the rotor.

[0029] As shown in the appendix Figure 1 to the appendix Figure 2 As shown, the angle α1 at the upper aluminum bars is equal to the angle α1 at the lower aluminum bars, and the angle α2 at the upper aluminum bars is equal to the angle α2 at the lower aluminum bars. The setting of the angles makes the positions of the same aluminum bar conductor different in the magnetic field, enabling the rotor to effectively avoid the peaks and valleys of odd harmonics, reducing the motor harmonics and achieving the noise reduction effect; at the same time, different from the traditional single-direction skew slots, the angles are symmetric in the radial direction of the rotor, which can eliminate the additional torque generated in the axial direction by the traditional rotor skew slot structure. In addition, it can also reduce the internal stress of the aluminum bars, reduce the pouring difficulty of the aluminum bars, and at the same time reduce the aluminum leakage situation, achieving the strengthening of the stability of the aluminum bar structure and reducing the fracture situation of the rotor aluminum bars 2.

[0030] As shown in the appendix Figure 1 to the appendix Figure 2 As shown, the angle α1 satisfies 2.5° ≤ α1 ≤ 3.5°, and the angle α2 satisfies 2.5° ≤ α2 ≤ 3.5°. And when the rotor rotates forward, that is, rotates clockwise, it is optimal to set α1 ≤ α2. When the rotor rotates in reverse, that is, rotates counterclockwise, it is optimal to set α1 ≥ α2. And the angles between the upper aluminum bars and the rotor need to be equal to the angles between the lower aluminum bars and the rotor. During operation, the axial torques generated by the two angles α1 and α2 of the upper and lower aluminum bars interact with each other, being able to offset the axial additional torque generated by the pure skew slot aluminum bars.

[0031] As shown in the appendix Figure 1 to the appendix Figure 2 As shown, the groove shape of the rotor slots 1 is a straight groove, and the bottoms of several rotor slots 1 are all tangent to the inner circle 4 of the rotor, and the tops of several rotor slots 1 are all tangent to the outer circle 5 of the rotor. The inner circle 4 of the rotor is a circle with a radius of R1, and the outer circle 5 of the rotor is a circle with a radius of R2. R1 and R2 are set according to the specific design requirements of the compressor.

[0032] As shown in the appendix Figure 1 to the appendix Figure 2 As shown, the rotor slot 1 has an upper slot body for placing the upper aluminum bar 21 and a lower slot body for placing the lower aluminum bar 22, and the radial areas of the upper slot body and the lower slot body are different.

[0033] As shown in the appendix Figure 1 to the appendix Figure 2 As shown, it further includes a rotor core 3. The rotor core 3 is composed of a plurality of rotor punching sheets that are proportionally reduced or enlarged and stacked, and the rotor core 3 is fastened by a snap connection method. The material and shape of the rotor end ring are not limited.

[0034] The rotor of the present invention can be applied to motors and their compressors.

[0035] The rotor slot type of this solution can be designed as a round-bottom and top slot, or a flat-bottom and top slot, and can be a single squirrel-cage slot type or a double squirrel-cage slot type. The size and shape of the slot type are not limited, and the specific shape of the rotor aluminum bar 2 is not limited.

[0036] The main function of the present invention: the setting of the rotor applied to the compressor and motor industries.

[0037] In summary, after those of ordinary skill in the art read the documents of the present invention, all other corresponding transformation schemes made without creative mental labor according to the technical solutions and technical concepts of the present invention belong to the scope protected by the present invention.

Claims

1. A rotor, characterized in that, The rotor has a number of rotor slots, and rotor aluminum bars are arranged in the rotor slots. The rotor aluminum bars include upper aluminum bars and lower aluminum bars, and the upper aluminum bars and the lower aluminum bars are arranged in sequence along the axial direction of the rotor. The upper aluminum bars and the lower aluminum bars are connected in series, and the rotor resistance is controlled by controlling the cross-sectional area S of the rotor aluminum bars and the height L of the rotor aluminum bars. The number of rotor slots and the rotor have two included angles α1 and α2 along the axial direction; The resistance formula of the rotor aluminum bar is The ratio of the cross-sectional area S of the rotor aluminum bar to the height L of the rotor aluminum bar is The height of the upper aluminum bar is L1, and the height of the lower aluminum bar is L2. The cross-sectional area S of the rotor aluminum bar has an integral non-linear relationship with the height L1 of the upper aluminum bar and the height L2 of the lower aluminum bar respectively, and the height ratio of the upper aluminum bar to the lower aluminum bar is Among them, p is the resistivity of the aluminum bar, S l1 is the cross-sectional area height of the upper aluminum bar at a certain height, S max is the maximum cross-sectional area height of the upper aluminum bar; The K value changes the total resistance of the rotor aluminum bars, and when K = 1, the resistance of the rotor aluminum bars is the largest; The included angle α1 at the upper aluminum bars is equal to the included angle α1 at the lower aluminum bars, and the included angle α2 at the upper aluminum bars is equal to the included angle α2 at the lower aluminum bars; The included angle α1 satisfies 2.5° ≤ α1 ≤ 3.5°, and the included angle α2 satisfies 2.5° ≤ α2 ≤ 3.5°.

2. A rotor according to claim 1, wherein The groove shape of the rotor slots is straight slots, and the bottoms of the number of rotor slots are all tangent to the inner circle of the rotor, and the tops of the number of rotor slots are all tangent to the outer circle of the rotor.

3. A rotor according to claim 2, characterized in that, The rotor slots have upper slot bodies for placing the upper aluminum bars and lower slot bodies for placing the lower aluminum bars, and the radial areas of the upper slot bodies and the lower slot bodies are different.

4. A rotor according to claim 1, characterized in that, It further includes a rotor core, which is composed of a number of rotor punching sheets that are proportionally reduced or enlarged and laminated, and the rotor core is fastened by a snap connection method.

5. A motor, characterized in that, It includes a rotor as described in any one of claims 1 to 4.

6. A compressor, characterized in that, It includes a rotor as described in any one of claims 1 to 4.

Images