Motor rotor, motor and compressor

Abstract

The present invention provides a motor rotor, a motor and a compressor. The motor rotor comprises: a rotor punching, at least two of the rotor punchings are stacked and fixed together, each of the rotor punchings is provided with a magnetic isolation hole, the magnetic isolation holes on each of the rotor punchings are arranged along the same straight line, and the cross-sectional areas of the magnetic isolation holes on each of the rotor punchings are different. Since the magnetic isolation holes on each of the rotor punchings in the present invention are arranged along the same straight line, and the cross-sectional areas of the magnetic isolation holes on each of the rotor punchings are different, the difference in the cross-sectional areas of the magnetic isolation holes on adjacent rotor punchings is utilized to make the normally placed magnetic steel produce the effects of oblique poles and staggered poles, thereby reducing the harmonics in the air gap of the motor, reducing the torque pulsation of the motor, and improving the electromagnetic noise of the motor. The structure is simple and easy to assemble.

Description

Technical Field

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

[0002] For air-conditioning products, in addition to the cooling effect, noise is also the key to evaluating a product. The noise seriously affects the user experience. During the operation of the air conditioner, the main causes of noise are mechanical noise, aerodynamic noise and electromagnetic noise. Among them, electromagnetic noise is excited by the electromagnetic harmonics generated by the compressor drive motor during operation.

[0003] At present, in order to solve the above problems, the rotor magnets are usually set to skew poles or staggered poles to reduce the noise of the motor. However, it is difficult to achieve mass production, and the stamping die is easily damaged and has a reduced lifespan.

[0004] With the increase of compressor horsepower, the demand for motor output torque is getting higher and higher, resulting in the continuous increase of motor stack height. As the core length increases, the motor power increases, and the motor shaft becomes thinner and thinner, which will have an adverse effect on the motor coaxiality and deflection. Not only will the motor shaft bend and deform more, but the electrical performance will also deteriorate. In severe cases, the bore will be swept (real rubbing), and even the inner circle of the stator will be locally heated, causing the insulation in the slot to become brittle and fail, resulting in winding grounding or short circuit, and causing vibration, making the motor noise increase. Summary of the invention

[0005] The main purpose of the present invention is to provide a motor rotor, a motor and a compressor to solve the problem that the motor in the prior art is difficult to assemble and has high noise.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a motor rotor is provided, comprising: a rotor punching, at least two of the rotor punchings are stacked and fixed together, each of the rotor punchings is provided with a magnetic isolation hole, the magnetic isolation holes on each of the rotor punchings are arranged along the same straight line, and the cross-sectional areas of the magnetic isolation holes on each of the rotor punchings are different.

[0007] Furthermore, a magnetic steel groove is provided on the rotor punching sheet, and the magnetic isolation hole is located on a side of the magnetic steel groove away from the center of the rotor punching sheet.

[0008] Furthermore, the magnetic isolation holes on each of the rotor punching sheets are arranged along a straight line parallel to the axis of the motor rotor.

[0009] Furthermore, the cross-sectional area of ​​the magnetic isolation hole on each of the rotor punchings gradually increases along the direction from the first end to the second end of the motor rotor, and the projection of the magnetic isolation hole with a smaller cross-sectional area at the end of the motor rotor is contained in the magnetic isolation hole with a larger cross-sectional area.

[0010] Furthermore, in two adjacent rotor punchings, the cross-sectional area of ​​the magnetic isolation hole with a larger cross-sectional area is S1, and the cross-sectional area of ​​the magnetic isolation hole with a smaller cross-sectional area is S2, wherein S2>1 / 3S1.

[0011] Furthermore, the magnetic isolation hole on each of the rotor punching sheets is a waist-shaped hole, and the width of the waist-shaped hole gradually increases along the direction from the first end to the second end of the motor rotor, and in two adjacent rotor punching sheets, the width of the wider waist-shaped hole is a, and the width of the narrower waist-shaped hole is b, wherein a / 2<b.

[0012] Furthermore, the number of the magnetic isolation holes on each pole of each rotor punching is x, the number of the rotor punching is y, and the number of poles of the motor rotor is p, wherein x-p+1=y.

[0013] Furthermore, the number x of the magnetic isolation holes on each pole of each rotor punching is 5, the number p of poles of the motor rotor is 3, and the number y of the rotor punching is 3.

[0014] Furthermore, along the direction from the first end to the second end of the motor rotor, the thickness of the rotor punching sheet gradually decreases.

[0015] Furthermore, the motor rotor further comprises a spacer, wherein the spacer is arranged between two adjacent rotor punching sheets, and a notch is arranged at a position of the spacer corresponding to the magnetic isolation hole.

[0016] Furthermore, the thickness of the spacer is in the range of 4 mm to 6 mm.

[0017] According to another aspect of the present invention, a motor is provided, comprising a motor rotor, wherein the motor rotor is the above-mentioned motor rotor.

[0018] According to yet another aspect of the present invention, a compressor is provided, comprising a motor, wherein the motor is the motor described above.

[0019] By applying the technical solution of the present invention, since the magnetic isolation holes on each rotor punching in the present invention are arranged along the same straight line and the cross-sectional areas of the magnetic isolation holes on each rotor punching are different, the difference in the cross-sectional areas of the magnetic isolation holes on adjacent rotor punchings is utilized to make the normally placed magnetic steel produce the effects of skewed poles and staggered poles, thereby reducing the harmonics in the air gap of the motor, reducing the torque pulsation of the motor, and improving the electromagnetic noise of the motor. The structure is simple and easy to assemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0021] Figure 1 A perspective view schematically shows a motor rotor of the present invention;

[0022] Figure 2 A schematic diagram shows a front view of a rotor punching of the present invention;

[0023] Figure 3 A schematic diagram shows a front view of a separator of the present invention;

[0024] Figure 4 A diagram schematically showing a comparison of the sizes of the magnetic isolation holes on each rotor punching from the first end to the second end of the rotor punching of the present invention;

[0025] Figure 5 A cross-sectional view of a motor rotor of the present invention is schematically shown;

[0026] Figure 6 A diagram schematically shows a comparison of the back electromotive force of the motor rotor of the present invention and the prior art motor rotor;

[0027] Figure 7 A torque pulsation comparison diagram between the motor rotor of the present invention and the existing motor rotor is schematically shown.

[0028] The above drawings include the following reference numerals:

[0029] 10. Rotor punching sheet; 11. Magnetic isolation hole; 12. Magnetic steel slot; 20. Spacer; 21. Notch. DETAILED DESCRIPTION

[0030] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0031] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0032] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations, and the spatially relative descriptions used herein are interpreted accordingly.

[0033] See also Figures 1 to 7 As shown, according to an embodiment of the present invention, a motor is provided, which includes a motor rotor, and the motor rotor includes at least two rotor punchings 10, the at least two rotor punchings 10 are stacked and fixed together, each rotor punching 10 is provided with a magnetic isolation hole 11, the magnetic isolation holes 11 on each rotor punching 10 are arranged along the same straight line, and the cross-sectional areas of the magnetic isolation holes 11 on each rotor punching 10 are different.

[0034] Since the magnetic isolation holes 11 on each rotor punching 10 in this embodiment are arranged along the same straight line and the cross-sectional areas of the magnetic isolation holes 11 on each rotor punching 10 are different, the difference in the cross-sectional areas of the magnetic isolation holes 11 on adjacent rotor punchings 10 is utilized to make the normally placed magnetic steel produce the effect of skewed poles and staggered poles, thereby reducing the harmonics in the air gap of the motor, reducing the torque pulsation of the motor, and improving the electromagnetic noise of the motor. The structure is simple and easy to assemble.

[0035] The cross-sectional area of ​​the magnetic isolation hole 11 in this embodiment refers to a cross section obtained by cutting perpendicularly to the axis of the motor rotor.

[0036] A magnetic steel slot 12 is provided on the rotor punching 10. In actual design, the magnetic isolation hole 11 is located on the side of the magnetic steel slot 12 away from the center of the rotor punching 10, that is, the outside of the magnetic steel slot 12. The magnetic isolation holes 11 on each rotor punching 10 are arranged along a straight line parallel to the axis of the motor rotor, which is convenient for improving the production efficiency of the motor rotor in this embodiment and reducing the difficulty of assembling the motor rotor.

[0037] See also Figures 1 to 5As shown, the cross-sectional area of ​​the magnetic isolation holes 11 on each rotor punching 10 in this embodiment gradually increases along the direction from the first end to the second end of the motor rotor, and the projection of the magnetic isolation holes 11 with smaller cross-sectional areas at the end of the motor rotor is contained in the magnetic isolation holes 11 with larger cross-sectional areas, and in two adjacent rotor punchings 10, the cross-sectional area of ​​the magnetic isolation holes 11 with larger cross-sectional areas is S1, and the cross-sectional area of ​​the magnetic isolation holes 11 with smaller cross-sectional areas is S2, wherein S2>1 / 3S1, so as to make the normally placed magnetic steel produce the effects of skewed poles and staggered poles, and effectively reduce the harmonics in the air gap of the motor.

[0038] The direction from the first end to the second end in this embodiment refers to the direction from the bottom end to the top end when the motor is used in the compressor. Figure 1 The bottom to top direction is shown in .

[0039] The magnetic isolation holes 11 on each rotor punching sheet 10 in the present embodiment are waist-shaped holes, the width of which gradually increases from the first end to the second end of the motor rotor, and in two adjacent rotor punching sheets 10, the width of the wider waist-shaped hole is a, and the width of the narrower waist-shaped hole is b, wherein a / 2<b, which facilitates the normally placed magnetic steel to produce the effect of skewed poles and staggered poles, effectively reducing the harmonics in the motor air gap, reducing the motor torque pulsation, and improving the motor electromagnetic noise.

[0040] Of course, in other embodiments of the present invention, the magnetic isolation hole 11 can also be set as a round hole, a triangular hole, a special-shaped hole, etc. As long as it is other deformation methods under the concept of the present invention, it is within the protection scope of the present invention.

[0041] Preferably, the number of magnetic isolation holes 11 on each pole of each rotor punching 10 in this embodiment is x, the number of rotor punchings 10 is y, and the number of poles of the motor rotor is p, wherein x-p+1=y.

[0042] Further preferably, in this embodiment, the number x of the magnetic isolation holes 11 on each pole of each rotor punching 10 is 5, the number p of poles of the motor rotor is 3, and the number y of the rotor punching 10 is 3.

[0043] The motor rotor in this embodiment is formed by axially stacking three types of rotor punching sheets 10. At this time, the skewed pole effect is the best and the process is the simplest.

[0044] Preferably, the thickness of the rotor punching sheet 10 gradually decreases along the direction from the first end to the second end of the motor rotor. Such an arrangement can lower the center of gravity of the motor and the center of gravity of the motor rotor when the motor is used in a compressor, thereby reducing crankshaft deformation and deflection, thereby improving the coaxiality of the motor and reducing the risk of motor bore scraping.

[0045] See again Figures 1 to 5As shown, the motor rotor in this embodiment further includes a spacer 20, which is arranged between two adjacent rotor punchings 10, and a notch 21 is arranged at a position of the spacer 20 corresponding to the magnetic isolation hole 11. Through the function of the notch 21, it is convenient to form an injection port surrounded by the rotor punchings 10 on the upper and lower sides of the spacer 20. When the motor is used in a compressor, the airflow ejected from the compressor pump body can be sprayed along the internal channel of the motor rotor to the stator in the radial direction, so that the airflow takes away part of the heat in the stator winding, thereby accelerating the heat dissipation of the motor stator.

[0046] Preferably, the thickness of the spacer 20 in this embodiment is in the range of 4 mm to 6 mm, for example, 5 mm, so as to avoid excessive magnetic flux leakage in the motor rotor and reduce the motor performance.

[0047] When the rotor punching sheets 10 are stacked, the thicker piece of the rotor punching sheet 10 is placed at the bottom, and the stacking is carried out in order from bottom to top. Figure 1 and Figure 5 The different rotor punching sheets 10 are stacked in a certain proportion, wherein the number of the thickest rotor punching sheets 10 accounts for more than 1 / 3 of the total rotor punching sheets 10; the exhaust portion formed by stacking the spacers 20 in the motor rotor is not higher than 5 mm, otherwise it will cause excessive magnetic leakage of the motor and a sharp drop in motor performance. Stacking according to this ratio can lower the center of gravity of the rotor, reduce deformation of the long axis, and reduce deflection.

[0048] According to an embodiment of the present invention, there is provided a motor rotor as described below:

[0049] In this embodiment, it is assumed that the total stacking height of the rotor core is 80 mm, 6 poles, and 5 magnetic isolation holes 11 for one pole pair, so there are three rotor punching sheets 10 in addition to the spacer 20. The specific implementation method is: the thickest rotor punching sheet 10 is placed on the lowest layer of the core, and it is stacked to a height of 30 mm, and then the spacer 20 is used for stacking. When the stacking reaches 34 mm as a whole, the second rotor punching sheet 10 is replaced for stacking, and the second rotor punching sheet 10 is stopped when the rotor core is stacked to 54 mm as a whole, that is, the partial height of the second rotor punching sheet 10 is 20 mm. Similarly, the spacer 20 is used for stacking until the core height is 58 mm, and finally the third rotor punching sheet 10 is used for stacking to a height of 80 mm.

[0050] Overall, the magnetic isolation holes 11 corresponding to each pole overlap on one side of the bottom projection, and the projection of the smaller magnetic isolation hole 11 to the bottom surface is completely included in the adjacent larger magnetic isolation hole 11, so that the vertically placed magnetic steel can produce the effect of tilted pole or staggered pole. Figure 6 and Figure 7 As shown, the back EMF of this example is more sinusoidal and has smaller torque ripple than a normal rotor.

[0051] After the motor rotor in this embodiment is used in a compressor, the gas is ejected from the pump body, rushes toward the rotor core, and enters the motor rotor along the magnetic isolation holes 11 of the rotor punching 10. When the gas flows to the junction of the first rotor punching 10 and the second rotor punching 10, since the magnetic isolation holes 11 of the second rotor punching 10 are smaller in cross-sectional area than the magnetic isolation holes 11 of the first rotor punching 10, part of the gas is diverted and ejected from the notch 21 on the partition 20.

[0052] According to another aspect of the present invention, a compressor is provided. The compressor includes a motor, and the motor is the motor in the above embodiment.

[0053] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0054] (1) By utilizing the special spatial structure above and below the rotor, the normally placed magnetic steel can produce the effect of skewed poles and staggered poles, thereby reducing the harmonics in the motor air gap, reducing the motor torque pulsation, and improving the motor electromagnetic noise;

[0055] (2) Make the rotor light on top and heavy on the bottom, lower the rotor's center of gravity, reduce crankshaft deformation and deflection, thereby improving the motor's coaxiality and reducing the risk of motor bore scraping;

[0056] (3) Cut the outer edge of the rotor and use the upward airflow of the pump body to cool the stator winding, thereby increasing the reliability of the compressor, extending its life, and reducing noise.

[0057] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A motor rotor, It is characterized in that include: Rotor punching sheets (10), at least two of the rotor punching sheets (10) are stacked and fixed together, each of the rotor punching sheets (10) is provided with a magnetic isolation hole (11), the magnetic isolation holes (11) on each of the rotor punching sheets (10) are arranged along the same straight line, and the cross-sectional areas of the magnetic isolation holes (11) on each of the rotor punching sheets (10) are different; The cross-sectional area of ​​the magnetic isolation hole (11) on each of the rotor punching sheets (10) gradually increases along the direction from the first end to the second end of the motor rotor, and the projection of the magnetic isolation hole (11) with a smaller cross-sectional area at the end of the motor rotor is contained within the magnetic isolation hole (11) with a larger cross-sectional area; In two adjacent rotor punching sheets (10), the cross-sectional area of ​​the magnetic isolation hole (11) with a larger cross-sectional area is S1, and the cross-sectional area of ​​the magnetic isolation hole (11) with a smaller cross-sectional area is S2, wherein S2>1 / 3S1.

2. The motor rotor according to claim 1, It is characterized in that The rotor punching sheet (10) is provided with a magnetic steel slot (12), and the magnetic isolation hole (11) is located on a side of the magnetic steel slot (12) away from the center of the rotor punching sheet (10).

3. The motor rotor according to claim 1, It is characterized in that The magnetic isolation holes (11) on each of the rotor punching sheets (10) are arranged along a straight line parallel to the axis of the motor rotor.

4. The motor rotor according to claim 1, It is characterized in that The magnetic isolation hole (11) on each of the rotor punching sheets (10) is a waist-shaped hole, and the width of the waist-shaped hole gradually increases along the direction from the first end to the second end of the motor rotor, and in two adjacent rotor punching sheets (10), the width of the wider waist-shaped hole is a, and the width of the narrower waist-shaped hole is b, wherein a / 2<b.

5. The motor rotor according to claim 1, It is characterized in that The number of the magnetic isolation holes (11) on each pole of each rotor punching sheet (10) is x, the number of the rotor punching sheets (10) is y, and the number of pole pairs of the motor rotor is p, wherein x-p+1=y.

6. The motor rotor according to claim 5, It is characterized in that The number x of the magnetic isolation holes (11) on each pole of each rotor punching sheet (10) is 5, the number p of pole pairs of the motor rotor is 3, and the number y of the rotor punching sheets (10) is 3.

7. The motor rotor according to claim 1, It is characterized in that Along the direction from the first end to the second end of the motor rotor, the thickness of the rotor punching sheet (10) gradually decreases.

8. The electric machine rotor according to any one of claims 1 to 7, It is characterized in that The motor rotor further comprises a spacer (20), wherein the spacer (20) is arranged between two adjacent rotor punching sheets (10), and a notch portion (21) is arranged at a position of the spacer (20) corresponding to the magnetic isolation hole (11).

9. The motor rotor according to claim 8, It is characterized in that The thickness of the spacer (20) is in the range of 4 mm to 6 mm.

10. A motor, comprising a motor rotor, It is characterized in that The motor rotor is the motor rotor according to any one of claims 1 to 9.

11. A compressor comprising a motor, It is characterized in that The motor is the motor described in claim 10.

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