Rotor, motor, compressor and refrigeration equipment

Abstract

The invention discloses a rotor, a motor, a compressor and refrigeration equipment, the rotor comprises a rotor punching sheet, the rotor punching sheet is provided with a shaft hole, a plurality of magnet grooves distributed around the shaft hole, and magnetic adjusting holes arranged between two adjacent magnet grooves, a center line between the two adjacent magnet grooves passes through the shaft hole, and the magnetic adjusting holes pass through the shaft hole. And in the rotating direction of the rotor, the magnetism adjusting holes are formed in the downstream of the corresponding center line. The technical scheme of the invention aims to reduce the noise of the motor.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a rotor, a motor, a compressor, and a refrigeration device. Background Art

[0002] With the progress of society and the development of economy, people's living standards have been significantly improved. When consumers choose refrigeration equipment such as air conditioners and refrigerators, in addition to paying attention to prices, they are also more concerned about the noise problem of refrigeration equipment. The compressor is the core component of refrigeration equipment such as refrigerators and air conditioners, and the motor is the power output component of the compressor. The greater the vibration of the motor, the greater the noise of the motor. The structure of the rotor has a great influence on the noise of the motor. Therefore, optimizing the structure of the motor rotor and reducing the working noise of the compressor are problems that technicians in this field need to solve at present. Summary of the invention

[0003] The main object of the present invention is to provide a rotor aimed at reducing the noise of the electric machine.

[0004] To achieve the above-mentioned purpose, the rotor proposed in the present invention includes a rotor punching, which is provided with an axial hole, a plurality of magnet slots arranged around the axial hole, and a magnetic adjustment hole arranged between two adjacent magnet slots, and the center line between the two adjacent magnet slots passes through the axial hole. In the rotation direction of the rotor, the magnetic adjustment hole is arranged downstream of the corresponding center line.

[0005] Optionally, the magnetic adjustment hole is in the shape of an elongated strip, and the angle formed by the lines connecting the two ends of the magnetic adjustment hole to the center of the shaft hole is a, and two adjacent magnet slots respectively have a symmetry axis passing through the center of the shaft hole, and the angle formed by the two symmetry axes is c, 0.25≤a / c≤0.42.

[0006] Optionally, the magnetic adjustment hole is in the shape of an elongated strip, and the angle between the line from the end of the magnetic adjustment hole away from the center of the shaft hole to the center of the shaft hole and the center line is b, and two adjacent magnet slots respectively have a symmetry axis passing through the center of the shaft hole, and the angle between the two symmetry axes is c, 0.034≤b / c≤0.123.

[0007] Optionally, the distances from both ends of the magnetic adjustment hole to the center of the axial hole are d and e, respectively, and 1.02≤d / e≤1.08.

[0008] Optionally, the distance from one end of the magnetic adjustment hole away from the shaft hole to the center of the shaft hole is d, the outer diameter of the rotor is r, and 0.3 mm≤rd.

[0009] Optionally, the magnetic adjustment hole includes a straight magnetic adjustment hole and / or a bent magnetic adjustment hole.

[0010] Optionally, the number of the magnetic adjustment holes between two adjacent magnet slots ranges from 1 to 5.

[0011] Optionally, the number of the magnet slots is P, the rotor is applied to a motor, the number of stator slots of the stator of the motor is Z, and Z / P=3 / 2.

[0012] The present invention also provides an electric motor, comprising the above-mentioned rotor.

[0013] The present invention also provides a compressor, comprising the aforementioned motor.

[0014] The present invention also provides a refrigeration device, which comprises the aforementioned compressor.

[0015] In the technical solution of the present invention, the rotor includes a rotor punching, the rotor punching is provided with an axial hole, a plurality of magnet slots arranged around the axial hole, and a magnetic adjustment hole arranged between two adjacent magnet slots, the center line between the two adjacent magnet slots passes through the axial hole, and in the rotation direction of the rotor, the magnetic adjustment hole is arranged downstream of the corresponding center line. Without loss of generality, the rotor includes a plurality of rotor punchings, and the plurality of rotor punchings are stacked in the axial direction of the rotor.

[0016] Please refer to Table 1:

[0017]

[0018] Table 1

[0019] Table 1 shows the simulation data of the rotor under electromagnetic simulation. It can be seen that the rotor punchings of the rotor are provided with magnetic adjustment holes, compared with the rotor without magnetic adjustment holes, the rotor has lower torque pulsation, that is, the magnetic adjustment holes are conducive to reducing the torque pulsation of the rotor. In addition, the rotor punchings also provided with magnetic adjustment holes, the magnetic adjustment holes are arranged downstream of the corresponding center line, compared with being arranged upstream, the rotor has lower torque pulsation. In this way, the rotor of this scheme includes rotor punchings, the rotor punchings are provided with magnetic adjustment holes, and the magnetic adjustment holes are arranged downstream of the corresponding center line, which is conducive to reducing the torque pulsation of the rotor, improving the magnetic field distribution of the motor, reducing the noise of the motor, and improving the performance indicators such as noise and vibration of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0021] Figure 1It is a schematic structural diagram of a rotor punching sheet of a rotor embodiment of the present invention, wherein the magnetic adjustment hole is in a straight strip shape;

[0022] Figure 2 It is a schematic structural diagram of a rotor punching sheet of an embodiment of a rotor of the present invention, wherein the magnetic adjustment hole is bent, and the bending part is at a right angle;

[0023] Figure 3 It is a schematic diagram of the structure of the rotor punching sheet of an embodiment of the rotor of the present invention, wherein the magnetic adjustment hole is bent, and the bending part is an acute angle;

[0024] Figure 4 It is a schematic structural diagram of a rotor punching sheet of a rotor embodiment of the present invention, wherein the magnetic adjustment hole is bent and the bending part is an obtuse angle.

[0025] Description of Figure Numbers:

[0026] Label name Label name 100 Rotor punching 300 Magnet slot 200 Shaft hole 400 Magnetic adjustment hole

[0027] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0030] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or abutment, and it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0032] With the progress of society and the development of economy, people's living standards have been significantly improved. When consumers purchase refrigeration equipment such as air conditioners and refrigerators, in addition to paying attention to prices, they are also more concerned about the noise problem of refrigeration equipment. The compressor is the core component of refrigeration equipment such as refrigerators and air conditioners, and the motor is the power output component of the compressor. The greater the vibration of the motor, the greater the noise of the motor. The structure of the rotor has a great influence on the noise of the motor. Therefore, optimizing the structure of the rotor of the motor and reducing the working noise of the compressor are problems that technicians in this field currently need to solve. To this end, the present invention proposes a rotor, which is intended to reduce the noise of the motor.

[0033] Reference Figures 1 to 4 In one embodiment of the present invention, the rotor includes a rotor punching 100, the rotor punching 100 is provided with an axial hole 200, a plurality of magnet slots 300 arranged around the axial hole 200, and a magnetic adjustment hole 400 arranged between two adjacent magnet slots 300, the center line between two adjacent magnet slots 300 passes through the axial hole 200, and in the rotation direction of the rotor, the magnetic adjustment hole 400 is arranged downstream of the corresponding center line. Without loss of generality, the rotor includes a plurality of rotor punchings 100, and the plurality of rotor punchings 100 are stacked in the axial direction of the rotor.

[0034] Please refer to Table 1:

[0035]

[0036] Table 1

[0037] Table 1 shows the simulation data of the rotor under electromagnetic simulation. It can be seen that the rotor punching 100 of the rotor is provided with a magnetic adjustment hole 400, compared with the rotor without the magnetic adjustment hole 400, the rotor has a lower torque pulsation, that is, the magnetic adjustment hole 400 is conducive to reducing the torque pulsation of the rotor. In addition, the rotor punching 100 that is also provided with a magnetic adjustment hole 400, the magnetic adjustment hole 400 is arranged downstream of the corresponding center line, compared with being arranged upstream, the rotor has a lower torque pulsation. In this way, the rotor of this scheme includes a rotor punching 100, and the rotor punching 100 is provided with a magnetic adjustment hole 400, and the magnetic adjustment hole 400 is arranged downstream of the corresponding center line, which is conducive to reducing the torque pulsation of the rotor, improving the magnetic field distribution of the motor, reducing the noise of the motor, and improving the performance indicators of the motor such as noise and vibration.

[0038] Optionally, in one embodiment, the magnetic adjustment hole 400 is in the shape of an elongated strip, and the angle formed by the lines connecting the two ends of the magnetic adjustment hole 400 to the center of the shaft hole 200 is a, and the two adjacent magnet slots 300 respectively have a symmetry axis passing through the center of the shaft hole 200, and the angle formed by the two symmetry axes is c, 0.25≤a / c≤0.42.

[0039] Please refer to Table 2:

[0040]

[0041]

[0042] Table 2

[0043] Table 2 shows the simulation data of the rotor under electromagnetic simulation. It can be seen that when a / c is in the range of [0.25, 0.44], as the value of a / c increases, the torque pulsation gradually decreases and then gradually increases. If the value of a / c is less than 0.25, the torque pulsation of the rotor will be large. If the value of a / c is greater than 0.42, the torque pulsation of the rotor will be large. Therefore, when 0.25≤a / c≤0.42, the torque pulsation of the rotor is less than 14%. The torque pulsation of the rotor is small, which is beneficial to reduce the noise of the motor and improve the performance indicators such as noise and vibration of the motor.

[0044] Optionally, in one embodiment, the magnetic adjustment hole 400 is in the shape of a long strip, and the angle between the line from the end of the magnetic adjustment hole 400 away from the center of the shaft hole 200 to the center of the shaft hole 200 and the center line is b, and two adjacent magnet slots 300 respectively have a symmetry axis passing through the center of the shaft hole 200, and the angle between the two symmetry axes is c, 0.034≤b / c≤0.123. In this way, the torque pulsation of the motor can be reduced, which is conducive to reducing the noise of the motor.

[0045] Please refer to Table 3:

[0046] b / c Torque ripple 0.137452121 16.35％ 0.122605379 13.19％ 0.107758638 9.83％ 0.092911897 7.8％ 0.078065155 7.13％ 0.063218414 7.5％ 0.048371672 10.14％ 0.033524931 12.6％ 0.01867819 14.73％ 0.003831448 16.63％ 0.034 16.65％ 0.033123143 16.67％

[0047] Table 3

[0048] Table 3 shows the simulation data of the rotor under electromagnetic simulation. It can be seen that in the range of b / c [0.033123143, 0.137452121], as the value of b / c increases, the torque pulsation gradually decreases and then gradually increases. If the value of b / c is less than 0.034, the torque pulsation of the rotor will be large. If the value of b / c is greater than 0.123, the torque pulsation of the rotor will be large. Therefore, when 0.034≤b / c≤0.123, the torque pulsation of the rotor is less than 17%. The torque pulsation of the rotor is small, which is beneficial to reduce the noise of the motor and improve the performance indicators such as noise and vibration of the motor.

[0049] Optionally, in one embodiment, the distances from the two ends of the magnetic adjustment hole 400 to the center of the shaft hole 200 are d and e, respectively, and 1.02≤d / e≤1.08.

[0050] Please refer to Table 4:

[0051] d / e Torque ripple 1.082824609 12.27 1.075765851 11.67 1.068798527 11.16 1.061920871 10.67 1.055131164 10.2 1.04842773 9.74 1.041808934 9.25 1.035273184 8.75 1.028818926 8.49 1.022444646 8.9 1.016148865 9.65

[0052] Table 4

[0053] Table 4 shows the simulation data of the rotor under electromagnetic simulation. It can be seen that when d / e is in the range of [1.016148865, 1.082824609], as the value of d / e increases, the torque pulsation gradually decreases and then gradually increases. If the value of d / e is less than 1.02, the torque pulsation of the rotor will be large. If the value of d / e is greater than 1.08, the torque pulsation of the rotor will be large. Therefore, when 1.02≤b / c≤1.08, the torque pulsation of the rotor is less than 12.27%. The torque pulsation of the rotor is small, which is beneficial to reducing the noise of the motor and improving the performance indicators such as noise and vibration of the motor.

[0054] Optionally, in one embodiment, the distance from the end of the magnetic adjustment hole 400 away from the shaft hole 200 to the center of the shaft hole 200 is d, the outer diameter of the rotor is r, and 0.3mm≤rd. In this way, the solid part between the magnetic adjustment hole 400 and the outer peripheral surface of the rotor punching sheet 100 will not be too thin, so that the structural strength of the rotor punching sheet 100 is relatively high, which is convenient for opening the magnetic adjustment hole 400 and improving the yield rate of the rotor punching sheet 100.

[0055] There are many shapes of the magnetic adjustment holes 400. Optionally, in one embodiment, the magnetic adjustment holes 400 include straight magnetic adjustment holes 400 and / or bent magnetic adjustment holes 400. The bending part of the bent magnetic adjustment holes 400 is designed at an angle, that is, the bending part can be an acute angle, a right angle or an obtuse angle. It is worth mentioning that the effect of the bent magnetic adjustment holes 400 in reducing the torque pulsation of the motor is better than that of the straight magnetic adjustment holes 400. Of course, the manufacturer can choose to open straight magnetic adjustment holes 400 and / or bent magnetic adjustment holes 400 on the rotor punching 100 according to actual needs.

[0056] Furthermore, in one embodiment, the bent magnetic adjustment hole 400 is bent toward a direction close to the center of the shaft hole 200 .

[0057] Optionally, in one embodiment, the number of the magnetic adjustment holes 400 between two adjacent magnet slots 300 ranges from 1 to 5. If the number of the magnetic adjustment holes 400 is too small, the improvement of the motor magnetic field distribution is not obvious enough, so that the reduction of the motor torque pulsation is not obvious enough, and the reduction of the motor noise is not obvious enough. If the number of the magnetic adjustment holes 400 is too large, the structural strength of the rotor punching 100 will be reduced, resulting in a low yield rate of the rotor punching 100, and it is not convenient to process the magnetic adjustment holes 400. Therefore, when the number of the magnetic adjustment holes 400 between two adjacent magnet slots 300 ranges from 1 to 5, it not only improves the motor magnetic field distribution, reduces the motor torque pulsation, reduces the noise of the motor, and improves the performance indicators of the motor such as noise and vibration, but also makes the rotor punching 100 have a higher structural strength, improves the yield rate of the rotor punching 100, and is also convenient to process the magnetic adjustment holes 400.

[0058] Optionally, in one embodiment, the number of the magnet slots 300 is P, the rotor is applied to a motor, the number of stator slots of the stator of the motor is Z, and Z / P = 3 / 2. In this way, the torque pulsation of the motor can be reduced, which is conducive to reducing the noise of the motor.

[0059] The present invention also proposes a motor, which includes the above-mentioned rotor. The specific structure of the rotor refers to the above-mentioned embodiment. Since this motor adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0060] The present invention also proposes a compressor, which includes the above-mentioned motor. The specific structure of the motor refers to the above-mentioned embodiment. Since the compressor adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0061] The present invention also proposes a refrigeration device, which includes the above-mentioned compressor. The specific structure of the compressor refers to the above-mentioned embodiment. Since the refrigeration device adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0062] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A rotor, characterized in that: The rotor includes a rotor punching, which is provided with an axial hole, a plurality of magnet slots arranged around the axial hole, and a magnetic adjustment hole arranged between two adjacent magnet slots. The center line between the two adjacent magnet slots passes through the axial hole. In the rotation direction of the rotor, the magnetic adjustment hole is arranged downstream of the corresponding center line.

2. The rotor according to claim 1, characterized in that The magnetic adjustment hole is in the shape of an elongated strip, and the angle formed by the lines connecting the two ends of the magnetic adjustment hole to the center of the shaft hole is a, and two adjacent magnet slots respectively have a symmetry axis passing through the center of the shaft hole, and the angle formed by the two symmetry axes is c, 0.25≤a / c≤0.

42.

3. The rotor according to claim 1, characterized in that The magnetic adjustment hole is in the shape of an elongated strip, and the angle between the line from the end of the magnetic adjustment hole away from the center of the shaft hole to the center of the shaft hole and the center line is b, and two adjacent magnet slots respectively have a symmetry axis passing through the center of the shaft hole, and the angle between the two symmetry axes is c, 0.034≤b / c≤0.

123.

4. The rotor according to claim 1, characterized in that The distances from the two ends of the magnetic adjustment hole to the center of the shaft hole are d and e, respectively, and 1.02≤d / e≤1.

08.

5. The rotor according to claim 1, characterized in that The distance between the end of the magnetic adjustment hole away from the shaft hole and the center of the shaft hole is d, the outer diameter of the rotor is r, and 0.3 mm≤rd.

6. The rotor according to claim 1, characterized in that The magnetic adjustment hole includes a straight magnetic adjustment hole and / or a bent magnetic adjustment hole.

7. The rotor according to claim 1, characterized in that The number of the magnetic adjustment holes between two adjacent magnet slots ranges from 1 to 5.

8. The rotor according to any one of claims 1 to 7, characterized in that The number of the magnet slots is P, the rotor is applied to a motor, the number of the stator slots of the motor is Z, and Z / P=3 / 2.

9. A motor, characterized in that: Comprising a rotor as claimed in any one of claims 1 to 8.

10. A compressor, characterized in that: Comprising the motor as claimed in claim 9.

11. A refrigeration device, characterized in that: Comprising the compressor of claim 10.

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