Stator core structure of compressor motor and rotor rolling type compressor

Abstract

The invention provides a stator core structure of a compressor motor and a rotor rolling type compressor, the compressor comprises a motor, a crankshaft and a cylinder, the motor comprises a stator and a rotor, the stator comprises a stator core, the stator core is provided with a through hole, the rotor is rotatably arranged in the through hole of the stator core, and the crankshaft is connected with the cylinder. One end of the crankshaft is connected with a rotor of the motor, the other end of the crankshaft is connected with the air cylinder, the rotor is connected with the air cylinder through the crankshaft, and a through hole of the stator iron core comprises a flaring section. The inner diameter of the end, away from the air cylinder, of the flaring section is larger than the inner diameter of the end, close to the air cylinder, of the flaring section. The problem that electromagnetic force densities of different positions of the rotor in the axial direction are different is solved, and then the vibration noise of the compressor motor is reduced.

Description

Technical Field

[0001] The invention relates to the field of compressors, and in particular to a stator core structure of a compressor motor capable of reducing vibration noise. Background Art

[0002] The rotary compressor for air conditioners includes a stator, a rotor, a pump body and other structures, wherein the pump body includes a crankshaft, a cylinder head, a cylinder and other structures.

[0003] The rotor is fixed at one end of the crankshaft and rotatably arranged in the through hole of the stator. There is an air gap of 0.4mm to 1mm between the stator and the rotor; the other end of the crankshaft passes through the cylinder head and extends into the cylinder. The rotor drives the crankshaft to rotate, compressing the refrigerant in the cylinder, thereby making the compressor work.

[0004] There will be a large radial attraction between the stator and the rotor, and the high-speed rotating rotor will also have a large centrifugal force, which will make the air gap between the stator and the rotor uneven and the minimum air gap smaller.

[0005] Although the existing technology can improve noise by increasing the overall stator-rotor air gap, it will also lead to a decrease in motor performance and an increase in cost. Summary of the invention

[0006] In view of the problems in the prior art, an object of the present invention is to provide a stator core structure of a compressor motor and a rotor rolling compressor for improving the vibration noise of the compressor motor.

[0007] According to one aspect of the present invention, a stator core structure of a compressor motor is provided, wherein the compressor comprises a motor, a crankshaft and a cylinder, the motor comprises a stator and a rotor, the stator comprises a stator core, a through hole is provided on the stator core, the rotor is rotatably arranged in the through hole of the stator core, one end of the crankshaft is connected to the rotor of the motor, the other end of the crankshaft is connected to the cylinder, the rotor is connected to the cylinder via the crankshaft, the through hole of the stator core comprises a flared section, the inner diameter of the flared section at one end away from the cylinder is larger than the inner diameter of the flared section at one end close to the cylinder.

[0008] Preferably, the expanded section of the stator core through hole is in a bell-mouth shape, and the inclination angle of the bell-mouth-shaped expanded section gradually becomes gentler toward the cylinder.

[0009] Preferably, the expanded section of the stator core through hole is in a stepped shape, the number of steps is n, and the inner diameters from the direction away from the cylinder (3) to the direction close to the cylinder (3) are d1, d2...dn, respectively, d1>d2>...>dn.

[0010] Preferably, the heights of the n steps are h1, h2, ..., hn, respectively, and h1<h2<...<hn.

[0011] Preferred: 3≤n≤10.

[0012] Preferably, the inner diameter differences (d1-d2), (d2-d3) ... (d(n-1)-dn) between each two adjacent steps decrease successively.

[0013] Preferably, the height differences between every two adjacent steps (h2-h1), (h3-h2) ... (hn-h(n-1)) increase successively.

[0014] Preferably: 3mm≤(h2-h1)<(h3-h2)<……<(hn-h(n-1))≤100mm.

[0015] Preferably: 0.4 mm ≥ (d1-d2) > (d2-d3) > ... > (d(n-1)-dn) ≥ 0.04 mm.

[0016] Preferably: the stator core includes a yoke portion, a tooth portion and a tooth shoe portion which are connected in sequence, the motor also includes a coil, the coil is arranged in a slot formed by the yoke portion and the tooth portion, and the expanded section of the through hole is arranged on the tooth shoe portion.

[0017] Preferably, the stator core is formed by stacking punching sheets.

[0018] According to another aspect of the present invention, a rotor rolling compressor is provided, comprising the stator core structure of the compressor motor according to the above.

[0019] The stator core structure of a compressor motor and a rotor rolling compressor of the present invention improve the uniformity of the minimum air gap between the stator and rotor in the axial direction through a multi-section stator core, thereby improving the problem of differences in electromagnetic force density at different positions of the rotor in the axial direction, and further improving the vibration noise of the compressor motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Other features, objectives and advantages of the present invention will become more apparent from a reading of the detailed description of non-limiting embodiments made with reference to the following accompanying drawings.

[0021] Figure 1 is a structural schematic diagram of a compressor according to an embodiment of the present invention;

[0022] Figure 2 is a structural schematic diagram of a stator core structure of an embodiment of the present invention;

[0023] Figure 3 It is a schematic diagram of the cross-sectional structure of the stator core of an embodiment of the present invention.

[0024] Reference numerals

[0025] 1 Motor

[0026] 2 Crankshaft

[0027] 3 Cylinders

[0028] 4 Stator

[0029] 5 Rotor

[0030] 6 Stator core

[0031] 7 Yoke

[0032] 8 Teeth

[0033] 9-tooth boot

[0034] 10 Coil DETAILED DESCRIPTION

[0035] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their repeated description will be omitted.

[0036] In an embodiment of the present invention, a stator core structure of a compressor motor is provided, which is suitable for compressors of refrigeration (heat) circulation systems such as refrigerators, air conditioners, freezers, heat pump water heaters, etc., and is preferably suitable for rotor rolling compressors.

[0037] like Figure 1 As shown in FIG. 1 , in an embodiment of the present invention, the compressor includes a motor 1 , a crankshaft 2 and a cylinder 3 .

[0038] The motor 1 includes a stator 4 and a rotor 5 .

[0039] The stator 4 includes a stator core 6. A through hole is provided on the stator core 6. The rotor 5 is rotatably disposed in the through hole of the stator core 6.

[0040] One end of the crankshaft 2 is connected to the rotor 5 of the motor 1, and the other end of the crankshaft 2 is connected to the cylinder 3, and the rotor 5 is connected to the cylinder 3 through the crankshaft 2. The through hole of the stator core 6 includes a flared section, and the inner diameter of the end of the flared section away from the cylinder 3 is larger than the inner diameter of the end of the flared section close to the cylinder 3.

[0041] The compressor drives the crankshaft 2 to rotate through the rotor 5 in the motor 1, compressing the refrigerant in the cylinder 3, so that the compressor works. Since there is a large radial attraction between the stator 4 and the rotor 5, the high-speed rotating rotor 5 also has a large centrifugal force, which will make the air gap between the stator and the rotor uneven and the minimum air gap smaller. This unevenness varies in the axial direction of the rotor 5. The farther away from the cylinder side, the worse the unevenness and the smaller the minimum air gap. The difference in the axial air gap is nonlinearly related to the axial position of the rotor 5, resulting in different eccentricities at different axial positions of the rotor 5, which in turn affects the magnetic flux distribution, resulting in differences in the electromagnetic force density at different axial positions of the rotor 5, causing vibration and noise problems in the compressor.

[0042] Therefore, the non-uniform stator core inner diameter of the embodiment of the present invention improves the uniformity of the minimum air gap between the stator and the rotor in the axial direction, thereby improving the problem of differences in electromagnetic force density at different positions of the rotor in the axial direction, and further improving the vibration noise of the compressor motor.

[0043] In the embodiment of the present invention, the expanded section of the stator core through hole is preferably in a bell-mouth shape, and the inclination angle of the bell-mouth-shaped expanded section is preferably gradually gentle toward the cylinder 3 to improve the uniformity of the minimum air gap in the axial direction.

[0044] In addition, if Figure 2 As shown in FIG. 1 , in the embodiment of the present invention, the expanded section of the through hole of the stator core 6 is preferably in a stepped shape.

[0045] The number of steps of the expansion section is preferably n, and the inner diameters from the direction away from the cylinder 3 to the direction close to the cylinder 3 are d1, d2...dn, and preferably 3≤n≤10, and further preferably d1>d2>...>dn, thereby forming a expansion section that is wide at the top and narrow at the bottom as shown in the figure.

[0046] Preferably, the heights of the n steps are h1, h2...hn, respectively, and the inner diameter differences (d1-d2), (d2-d3)...(d(n-1)-dn) between each two adjacent steps decrease successively. The height differences (h2-h1), (h3-h2)...(hn-h(n-1)) between each two adjacent steps increase successively. Preferably, 3mm≤(h2-h1)<(h3-h2)<...<(hn-h(n-1))≤100mm, 0.4mm≥(d1-d2)>(d2-d3)>...>(d(n-1)-dn)≥0.04mm. From the section away from the pump body to the section of the pump body, the inner diameter section difference decreases successively, the section height increases successively, and the inner diameter of the stator is bell-mouth-shaped.

[0047] Combined with Figure 3 As shown in , in the embodiment of the present invention, the stator core 6 is preferably formed by stacking punching sheets. The thickness of the punching sheets is 0.5 mm or 0.35 mm, and the stator core 6 with the expanded section is formed by punching sheets of different sizes.

[0048] Preferably, the stator core 6 includes a yoke 7, a tooth 8 and a tooth shoe 9 connected in sequence. The motor 1 also includes a coil 10, which is wound on the tooth 8 and arranged in a slot formed by the yoke and the tooth. The expanded section of the through hole is arranged on the tooth shoe 9.

[0049] Example 1

[0050] For a 5Kw, 80mm stack height 6-pole 9-slot motor, the 6-fold frequency 3rd order eccentric electromagnetic force density at different axial positions (position 1: top of the stator core; position 2: middle of the stator core; position 3: bottom of the stator core) is calculated through simulation.

[0051] If the inner diameter of the stator core is equal at the top and bottom, the electromagnetic force density at position 1 is 99848N / m 2 , the electromagnetic force density at position 2 is 92647N / m 2 , the electromagnetic force density at position 3 is 87506N / m 2

[0052] In this embodiment, n=4 is used. (d1-d2)=0.2mm, (d2-d3)=0.15mm, (d4-d3)=0.1mm. (h2-h1)=3mm, (h3-h2)=5mm, (h4-h3)=49mm. Then the electromagnetic force density at position 1 is 92263N / m 2 , the electromagnetic force density at position 2 is 91127N / m 2 , the electromagnetic force density at position 3 is 88225N / m 2 .

[0053] It can be seen that the uniformity of the spatial distribution of the electromagnetic force density of this embodiment is improved.

[0054] In summary, the stator core structure of the compressor motor and the rotor rolling compressor of the embodiments of the present invention improve the problem of differences in electromagnetic force density at different positions of the rotor in the axial direction, thereby improving the vibration noise of the compressor motor.

[0055] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A stator core structure of a compressor motor, characterized in that: The compressor comprises a motor (1), a crankshaft (2) and a cylinder (3); the motor (1) comprises a stator (4) and a rotor (5); the stator (4) comprises a stator core (6); a through hole is provided on the stator core (6); the rotor (5) is rotatably arranged in the through hole of the stator core (6); one end of the crankshaft (2) is connected to the rotor (5) of the motor (1); the other end of the crankshaft (2) is connected to the cylinder (3); the rotor (5) is connected to the cylinder (3) via the crankshaft (2); the through hole of the stator core (6) comprises a flared section; the inner diameter of the end of the flared section away from the cylinder (3) is larger than the inner diameter of the end of the flared section close to the cylinder (3).

2. The stator core structure of the compressor motor according to claim 1, characterized in that: The expanded section of the through hole of the stator core (6) is in the shape of a bell mouth, and the inclination angle of the expanded section in the bell mouth shape gradually becomes gentler towards the cylinder (3).

3. The stator core structure of the compressor motor according to claim 1, characterized in that: The expanded section of the through hole of the stator core (6) is in a stepped shape, the number of steps is n, and the inner diameters from the direction away from the cylinder (3) to the direction close to the cylinder (3) are d1, d2...dn, respectively, d1>d2>...>dn.

4. The stator core structure of the compressor motor according to claim 3, characterized in that: The heights of the n steps are h1, h2, ..., hn, respectively, h1<h2<...<hn.

5. The stator core structure of the compressor motor according to claim 3, characterized in that: 3≤n≤10。 6. The stator core structure of the compressor motor according to claim 5, characterized in that: The inner diameter differences (d1-d2), (d2-d3) ... (d(n-1)-dn) between each two adjacent steps decrease successively.

7. The stator core structure of the compressor motor according to claim 5, characterized in that: The height difference between each two adjacent steps (h2-h1), (h3-h2)...(hn-h(n-1)) increases successively.

8. The stator core structure of the compressor motor according to claim 7, characterized in that: Then 3mm≤(h2-h1)<(h3-h2)<……<(hn-h(n-1))≤100mm.

9. The stator core structure of the compressor motor according to claim 6, characterized in that: 0.4mm≥(d1-d2)>(d2-d3)>……>(d(n-1)-dn)≥0.04mm.

10. The stator core structure of the compressor motor according to claim 1, characterized in that: The stator core (6) comprises a yoke (7), a tooth (8) and a tooth shoe (9) which are connected in sequence. The motor (1) further comprises a coil (10), wherein the coil (10) is arranged in a slot formed by the yoke (7) and the tooth (8), and the expanded section of the through hole is arranged on the tooth shoe (9).

11. The stator core structure of the compressor motor according to claim 1, characterized in that: The stator core (6) is formed by stacking punched sheets.

12. A rotor rolling compressor, characterized in that: A stator core structure comprising a compressor motor according to any one of claims 1 to 11.

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