Rotor and electric machine

Abstract

A rotor and motor, comprising a rotor core, a shaft hole is arranged in the center of the rotor core for installing a motor shaft, the rotor core is evenly divided into several magnetic force blocks with the shaft hole as the center, and the outer contour of each magnetic force block has an arc segment, two connecting segments and a recessed segment connected in sequence along the circumference; the arc segment and the connecting segment are composed of different centers and different arc radii, so that the overall contour of the rotor presents a non-circular structure, which can optimize the air gap flux density distribution, make the air gap flux tend to be a chord wave, and improve the torque and torque ripple, and the recessed segment can limit the magnetic flux flow path, make the magnetic flux flow to the ideal magnetic circuit, reduce the occurrence of magnetic leakage and optimize the air gap flux density distribution; thereby, the torque ripple and the torque are greatly reduced, the noise is improved, and the stability of the output torque of the motor is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compressor, in particular to a rotor and motor. BACKGROUND

[0002] The existing rotary compressor mainly includes the following components: exhaust pipe, casing, motor (stator, rotor), transmission shaft, upper bearing, muffler, compression unit (cylinder, piston), lower bearing, bottom cover, outlet pipe, liquid accumulator and inlet pipe. The basic working principle of the compressor is as follows: when the compressor is powered on, the stator generates a magnetic field, which makes the rotor rotate, drives the transmission shaft, and makes the piston move eccentrically in the cylinder, thereby compressing the low-temperature and low-pressure gas refrigerant medium into high-temperature and high-pressure gas, and then discharging it from the cylinder to the casing through the muffler. Then, through the edge cutting outside the stator and the gap between the rotors, the gas is discharged into the refrigeration cycle system through the outlet pipe.

[0003] As is known to all, permanent magnet synchronous motors are widely used in household appliances such as air conditioner compressors due to their high efficiency. A common method to improve motor efficiency is to increase the air gap magnetic field of the motor. However, when this method is used, the air gap magnetic field harmonic will also increase, resulting in increased noise and vibration of the motor and compressor.

[0004] Therefore, the present inventor has made intensive studies and combined with the use of theories to solve the above problems, which is the improvement goal of the present inventor. SUMMARY

[0005] Therefore, the present application aims to provide a rotor that significantly reduces torque ripple and jerk torque, improves air gap flux waveform, and reduces magnetic flux leakage, thereby reducing vibration and noise and improving the stability of the output torque of the motor, to solve the problems of the existing technology.

[0006] To achieve the foregoing purpose, the present application provides a rotor, which comprises a rotor core, the rotor core being a cylindrical body with a predetermined length, and an axle hole is provided at the center of the rotor core for mounting a motor axle, the axle hole penetrating through both ends of the rotor core, characterized in that:

[0007] The rotor core is evenly divided into a plurality of magnetic force blocks with the axle hole as the center, and the outer contour of each magnetic force block has a connected arc segment, two connecting segments and a recessed segment in sequence along the circumference; the arc segment is adjacent to the two connecting segments, and the recessed segment is adjacent to the one connecting segment; the radius of the arc segment is R1, the radius of the connecting segment is R2, and the distance between the recessed segment and the center point of the rotor core is d3; wherein the arc segment and the connecting segment are composed of different centers and different radii, so that the overall outer contour of the rotor presents a non-circular structure.

[0008] Preferably, a first imaginary line is defined, the first imaginary line extends from the center point of the rotor core through the center point of the arc segment, the center point of the arc segment is located on the first imaginary line; wherein the distance between the center point of the arc segment and the center point of the rotor core is d1, the distance between the center point of the rotor core and the top end of the arc segment is d2, and d1 < d2 is satisfied.

[0009] Preferably, the distance between the center point of the arc segment and the center point of the rotor core is d1; the radius of the arc of the connecting segment is R2, and d1 < R2 is satisfied.

[0010] Preferably, the radius of the arc of the connecting segment is R2, the distance between the center point of the rotor core and the top end of the arc segment is d2, the distance between the center point of the rotor core and the bottom end of the recess segment is d3, and d2 >= R2 > d3 is satisfied.

[0011] Preferably, the rotor further comprises a plurality of magnets, the magnets are respectively arranged at the magnetic force blocks of the rotor core.

[0012] Preferably, each magnetic force block is provided with a magnet slot, the magnet slot penetrates from the top surface of the magnetic force block to the bottom surface of the magnetic force block, and the magnet slot is used for mounting the magnet.

[0013] Preferably, a second imaginary line is defined, the second imaginary line extends from the center point of the rotor core through the center point of the recess segment; wherein the bottom end of the recess segment is designed as a straight line, the length of the straight line of the bottom end of the recess segment is a1, the distance between the connecting line of the midpoint of the wide side of the two magnets is a2, and the following relationship is satisfied:

[0014] Preferably, the shape of the recess segment is any shape.

[0015] Preferably, the shape of the magnet slot of each magnetic force block is any one of a strip shape or a V shape.

[0016] According to another aspect of the present application, an electric machine is also provided, characterized in that it comprises:

[0017] a stator; and

[0018] a rotor, the rotor is the above-mentioned rotor, the rotor is arranged in the stator, and the rotor can rotate relative to the stator.

[0019] Through the above structure, the beneficial effects of the present application are:

[0020] 1. A rotor comprising a rotor core and magnets. The rotor core is divided into a plurality of magnetic blocks with an axis hole as the center. Each magnetic block is provided with a magnet slot for setting a magnet and forming a magnetic pole. The outer contour of each magnetic block has, in sequence along the circumference, a connected arc segment, a connecting segment and a recess segment. The arc segment is adjacent to the connecting segments, and the recess segment is adjacent to the connecting segment. A first imaginary line is defined by extending through the center point of the recess segment from the center point of the rotor core. The center point of the arc segment is on the first imaginary line but is not concentric with the center point of the rotor core. The arc segment and the connecting segment have different center points and different arc radii. The outer contour of the rotor as a whole has a non-circular structure. The non-circular structure optimizes the air gap flux density distribution, makes the air gap flux tend to be a chord wave, and improves the starting torque and torque ripple.

[0021] 2. A rotor comprising a rotor core and magnets. The rotor core is divided into a plurality of magnetic blocks with an axis hole as the center. Each magnetic block is provided with a magnet slot for setting a magnet and forming a magnetic pole. The outer contour of each magnetic block has, in sequence along the circumference, a connected arc segment, a connecting segment and a recess segment. The arc segment is adjacent to the connecting segments, and the recess segment is adjacent to the connecting segment. A second imaginary line is defined by extending through the center point of the recess segment from the center point of the rotor core. The bottom end of the recess segment is a straight line, and the length of the straight line is a1. The distance between the midpoints of the wide edges of the two magnets is a2. The following relationship is satisfied: The recess segment is closed to reduce the occurrence of the recess segment on the second imaginary line. The recess segment limits the magnetic flux flow path, makes the magnetic flux flow to the ideal magnetic circuit, reduces the occurrence of magnetic leakage, and optimizes the air gap flux density distribution. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 FIG. 1 is a top view of the rotor of the present application (I).

[0023] Figure 2 FIG. 2 is a partial enlarged view of the rotor of the present application. Figure 1

[0024] Figure 3 FIG. 3 is a top view of the rotor of the present application (II).

[0025] Figure 4 FIG. 4 is a top view of the motor of the present application.

[0026] 1. Rotor 11. Rotor core

[0027] 110. Axis hole 111. Magnetic block

[0028] 1111. Magnet slot 112. Arc segment ​

[0029] 113 connecting section 114 recessed section

[0030] 12 magnet

[0031] 2 stator

[0032] a1 length a2 distance

[0033] D first imaginary line d1 distance

[0034] d2 distance d3 distance

[0035] Q second imaginary line

[0036] R1 arc radius R2 arc radius DETAILED DESCRIPTION

[0037] In order to understand the features, content and advantages of the present application and the effects that can be achieved, the present application is described in detail below in the form of embodiments in conjunction with the accompanying drawings, whose purpose is only to illustrate and assist the description, and not necessarily the true proportions and accurate configurations after the implementation of the present application, so the appended drawings should not be interpreted as limiting the scope of the right of the present application in actual implementation.

[0038] The advantages, features and achieved technical methods of the present application will be described in more detail and more easily understood with reference to the exemplary embodiments and the accompanying drawings, and the present application can be implemented in different forms, so it should not be understood as being limited to the embodiments described herein, on the contrary, for those skilled in the art, the provided embodiments will make the present disclosure more thorough and comprehensive and complete in conveying the scope of the present application, and the present application will be defined only by the appended claims.

[0039] First embodiment

[0040] First, please refer to Figures 1 to 3 , Figure 1 is a plan view of the rotor of the present application (one), Figure 2 is a partial enlarged view of the present application Figure 1 , Figure 3 is a plan view of the rotor of the present application (two).

[0041] The rotor 1 comprises a rotor core 11 which is a cylindrical body with a predetermined length, and the rotor core 11 is provided with an axial hole 110 for mounting a motor shaft (not shown) at the center of the rotor core 11, and the axial hole 110 penetrates through both ends of the rotor core 11, i.e. the upper end and the lower end of the rotor core 11. The rotor core 11 of the present application is formed by stacking a plurality of silicon steel sheets from bottom to top to form the aforementioned cylindrical body, and each silicon steel sheet is provided with an inner hole at the center position, and the inner holes are stacked to form the aforementioned axial hole 110 of the rotor core 11 which cooperates with the motor shaft (not shown).

[0042] The rotor core 11 is evenly divided into a plurality of magnetic force blocks 111 with the axial hole 110 as the center, and each magnetic force block 111 has a connected arc segment 112, a connected segment 113 and a recessed segment 114 in sequence along the circumference; the arc segment 112 is adjacent to the two connected segments 113, and the recessed segment 114 is adjacent to the connected segment 113; the radius of the arc segment 112 is R1, the radius of the connected segment 113 is R2, and the distance between the recessed segment 114 and the center point of the rotor core 11 is d3; wherein the arc segment 112 and the connected segment 113 are formed by different centers and different radii, so that the overall outline of the rotor 1 presents a non-circular structure.

[0043] The above structure is further described as follows:

[0044] In the present embodiment, a first imaginary line D is defined, which extends from the center point of the rotor core 11 through the center point of the arc segment 112, and the center point of the arc segment 112 is located on the first imaginary line D, i.e. any point on the first imaginary line D, but cannot be concentric with the center point of the rotor core 11; wherein the distance between the center point of the arc segment 112 and the center point of the rotor core 11 is d1, the distance between the center point of the rotor core 11 and the top end of the arc segment 112 is d2, and d1 < d2 is satisfied; in other words, the center point of the arc segment 112 and the center point of the rotor core 11 are not concentric.

[0045] In the foregoing, the distance between the center point of the arc segment 112 and the center point of the rotor core 11 is d1, the radius of the connected segment 113 is R2, and d1 < R2 is satisfied; in other words, the distance d1 between the center point of the arc segment 112 and the center point of the rotor core 11 does not exceed the radius R2 of the connected segment 113.

[0046] Further, the radius of the arc of the connecting segment 113 is R2, the distance between the center point of the rotor core 11 and the top end of the arc segment 112 is d2, and the distance between the recess segment 114 and the center point of the rotor core 11 is d3, and d2≧R2>d3 is satisfied; in other words, the distance d2 between the center point of the rotor core 11 and the top end of the arc segment 112 is greater than or equal to the radius R2 of the arc of the connecting segment 113, and the radius R2 of the arc of the connecting segment 113 is greater than the distance d3 between the recess segment 114 and the center point of the rotor core 11.

[0047] In the present embodiment, the rotor 1 further includes a plurality of magnets 12, which are respectively arranged at the magnetic force blocks 111 of the rotor core 11; and each magnetic force block 111 is provided with a magnet slot 1111, which penetrates through the top surface of the magnetic force block 111 to the bottom surface of the magnetic force block 111, and the magnet slot 1111 is used for mounting the magnet 12. The shape of the magnet slot 1111 of the magnetic force block 111 is any one of a long strip shape (as shown in Figure 1 ) or a V shape (as shown in Figure 3 ).

[0048] In the present embodiment, a second imaginary line Q is defined, which extends from the center point of the rotor core 11 through the center point of the recess segment 114; wherein the bottom end of the recess segment 114 is a straight line, i.e. the bottom surface of the recess segment 114; the length of the straight line at the bottom end of the recess segment 114 is a1, and the distance between the midpoints of the wide sides of the two magnets 12 is a2 (as shown in Figure 2 ), which satisfies the following relationship: The shape of the recess segment 114 is any shape; in other words, the recess segment 114 is designed with a straight line at the bottom end, and the shapes of the two side surfaces, i.e. the two side ends, are not limited, which can be any one of a flat shape (extending straight upward from the bottom end, i.e. the angle between the bottom end and the two ends is 90 degrees), an arc shape (such as an outer arc shape or an inner arc shape), an inclined shape (extending upward and outward from the bottom end, i.e. the angle between the bottom end and the two ends is greater than 90 degrees; or extending upward and inward from the bottom end, i.e. the angle between the bottom end and the two ends is less than 90 degrees), or other shapes; therefore, the recess segment 114 can be any one of the above shapes, and is not limited to a single style. In the drawings of the present application, the angle between the bottom and the two side ends of the recess segment 114 is 90 degrees, i.e. the recess segment 114 is in a rectangular shape, which avoids the recess segment 114 from being in a closed state.

[0049] Second embodiment

[0050] Please refer to Figure 4 , Figure 4As a top view of the motor of the present application, the embodiment provides a motor, which comprises a stator 2 and a rotor 1, the rotor 1 is the aforementioned rotor 1, since the overall structure of the rotor 1 has been described above, it will not be described again. The rotor 1 is arranged inside the stator 2, and the rotor 1 can rotate relative to the stator 2.

[0051] In this structure, the rotor core 11 is divided into a plurality of magnetic force blocks 111 with the shaft hole 110 as the center, each of the magnetic force blocks 111 is provided with a magnet slot 1111, the magnet 12 is arranged in the magnet slot 1111 and forms a magnetic pole, and the outer contour of each of the magnetic force blocks 111 has a connected arc segment 112, two connecting segments 113 and a recessed segment 114 in sequence along the circumference; the arc segment 112 is adjacent to the two connecting segments 113, and the recessed segment 114 is adjacent to the connecting segment 113, and a first imaginary line D is defined by extending through the center point of the arc segment 112 from the center point of the rotor core 11, and a second imaginary line Q is defined by extending through the center point of the recessed segment 114 from the center point of the rotor core 11, the center point of the arc segment 112 is located on the first imaginary line D, but is not concentric with the center point of the rotor core 11, so that the arc segment 112 and the connecting segment 113 are formed by different centers and different arc radii, so that the overall outer contour of the rotor 1 presents a non-circular structure, in this way, the non-circular structure can optimize the air gap flux density distribution, make the air gap flux tend to be a chord wave, and improve the starting torque and torque ripple.

[0052] Further, the center point of the rotor core 11 extends through the center point of the recessed segment 114 to define a second imaginary line Q, wherein the bottom end of the recessed segment 114 is designed as a straight line, the straight line length of the bottom end of the recessed segment 114 is a1, and the distance value of the connecting line between the midpoints of the wide edges of the two magnets 12 is a2, which satisfies the following relationship: The occurrence of the closure of the recessed segment 114 is reduced in this way, so that the recessed segment 114 located on the second imaginary line Q can limit the magnetic flux flow path, make the magnetic flux flow to the ideal magnetic circuit, reduce the occurrence of leakage magnetic flux and optimize the air gap flux density distribution.

[0053] As described above, in order to reduce the fluctuation of the motor output torque, that is, to reduce the torque ripple and the starting torque of the motor, the appearance contour of the rotor 1 is modified, the main purpose of which is to optimize the air gap flux density distribution, make it tend to be a chord wave, reduce the air gap field harmonics and reduce the torque fluctuation, and then achieve the purpose of improving the vibration noise of the motor.

[0054] The above is only an embodiment of the present application, which cannot limit the scope of the present application, any simple equivalent changes and modifications made according to the content of the claims and the patent specification of the present application are still within the scope of the present application.

Claims

1. A rotor comprising a rotor core which is a cylindrical body having a predetermined length, and having a shaft hole for mounting a motor shaft at the center thereof, the shaft hole extending through both ends of the rotor core, characterized in that: the rotor core is divided into a plurality of magnetic force blocks on average with the shaft hole as the center, and the outer contour of each of the magnetic force blocks has, in the circumferential direction, an arc segment, two connecting segments, and a recessed segment; the arc segment is adjacent to the two connecting segments, and the recessed segment is adjacent to one end of the one connecting segment away from the arc segment, wherein the recessed segment is concave in shape and includes a bottom end and two side surfaces which extend upward from the bottom end and are connected to one end of the connecting segment; the arc segment has a radius of curvature R1, the connecting segment has a radius of curvature R2, and the distance between the recessed segment and the center point of the rotor core is d3; wherein the arc segment and the connecting segment are formed by different centers and different radii of curvature, so that the overall outer contour of the rotor presents a non-circular structure; the rotor further comprises a plurality of magnets, which are respectively arranged at each of the magnetic force blocks of the rotor core; a first imaginary line is defined, which extends from the center point of the rotor core through the center point of the arc segment, and the center point of the arc segment is located on the first imaginary line; wherein the distance between the center point of the arc segment and the center point of the rotor core is d1, the distance between the center point of the rotor core and the top end of the arc segment is d2, and d1 < d2 is satisfied. A second imaginary line is defined, which is extended from the center point of the rotor core through the center point of the recessed section; wherein the bottom end of the recessed section is designed as a straight line, the straight line length of the bottom end of the recessed section is a1, the distance value of the connecting line between the midpoints of the wide edges of the two adjacent magnets of the adjacent magnetic force blocks is a2, which satisfies the following relationship: 1 <5.

2. The rotor of claim 1, wherein The distance between the center point of the arc segment and the center point of the rotor core is d1; the radius of curvature of the connecting segment is R2, and d1 < R2 is satisfied.

3. The rotor of claim 2, wherein The radius of curvature of the connecting segment is R2, the distance between the center point of the rotor core and the top end of the arc segment is d2, the distance between the recessed segment and the center point of the rotor core is d3, and d2 ≧ R2 > d3 is satisfied.

4. The rotor of claim 3, wherein Each of the magnetic force blocks is provided with a magnet slot which extends through the bottom surface of the magnetic force block along the top surface of the magnetic force block, and the magnet slot is provided for mounting the magnet.

5. The rotor of claim 1, wherein The shape of the recessed segment is any shape.

6. The rotor of claim 1, wherein The shape of the magnet slot of each of the magnetic force blocks is any one of a long strip shape or a V shape.

7. The rotor of claim 5 wherein, Comprise:

8. An electric machine characterized by a stator; and a rotor, which is the rotor according to any one of claims 1-7, and is arranged inside the stator and can rotate relative to the stator. ​

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