Unequal air gap motor structure and scroll compressor

Abstract

The utility model discloses an unequal air gap motor structure and a scroll compressor, belongs to the technical field of compressors, and aims to solve the problems that the motor efficiency is influenced and vibration and noise are caused by adopting a uniform air gap structure. According to the technical scheme, the unequal-air-gap motor structure comprises a plurality of stator punching sheets and a plurality of rotor punching sheets, stator inner holes are formed in the stator punching sheets, the rotor punching sheets are located in the stator inner holes, and a plurality of magnetic poles are arranged on the sides, close to the rotor punching sheets, of the stator punching sheets. A plurality of air gaps are formed between the sides, close to the rotor punching sheet, of the magnetic poles and the outer ring surface of the rotor punching sheet, a plurality of concave structures are arranged on the sides, close to the rotor punching sheet, of the magnetic poles, the intervals of the air gaps are unequal, and through the concave structures which are the same in shape and structure and are mutually symmetrical, the machining difficulty is reduced, and the length of the air gaps can be remarkably increased; and meanwhile, an unequal air gap structure is formed, so that the noise in the operation process of the motor is reduced, the noise in the operation process of the scroll compressor is further reduced, and the performance and the reliability of the scroll compressor are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of compressors, and more specifically to an unequal air gap motor structure and a scroll compressor. Background Art

[0002] In scroll compressors, the air gap between the stator and the rotor is a key factor affecting the performance of the motor. The air gap is not only a passage for magnetic flux, allowing the magnetic field to pass from the stator to the rotor to achieve the conversion of electrical energy into mechanical energy, but its size also affects the motor's magnetic resistance, magnetic field strength and ultimate efficiency. While keeping the magnetomotive force unchanged, the larger the air gap, the higher the magnetic resistance, resulting in a decrease in the density of the magnetic flux lines, thereby weakening the strength of the magnetic field.

[0003] In the prior art, stator punching sheets are important components of the motor stator. Each magnetic pole of the stator punching sheets is provided with a stator pole shoe. The surfaces of the stator pole shoes facing the inner hole of the stator are all arc surfaces, and these arc surfaces are concentric arcs. When these stator punching sheets are stacked into a motor stator to assemble the motor, the gap formed between the motor rotor and the pole shoe surface is the air gap. The air gap between the arc surface of the entire stator pole shoe and the motor rotor is uniform and unchanged, that is, a uniform air gap structure is adopted.

[0004] Although the uniform air gap structure simplifies the manufacture of the motor, since the air gap between the arc surface of the entire stator pole shoe and the rotor is fixed, the magnetic field density in the air gap is also constant. The air gap magnetic field is not an ideal sine wave. The air gap magnetic field contains a large number of harmonics, resulting in a large harmonic content in the electromotive force, increasing the harmonic current and additional harmonic iron loss of the motor, which will not only affect the improvement of the motor efficiency, but also cause torque fluctuations, thereby causing vibration and noise during motor operation. Therefore, a new solution is needed to solve the problem of using a uniform air gap structure affecting motor efficiency and causing vibration and noise. Utility Model Content

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide an unequal air gap motor structure, so as to optimize the NVH (noise, vibration and roughness) performance of the motor for the scroll compressor through the structural setting.

[0006] The above technical purpose of the utility model is achieved through the following technical solutions: an unequal air gap motor structure, including a plurality of stator punchings and rotor punchings, the inside of the stator punchings is provided with a stator inner hole, the rotor punchings are located in the stator inner hole, a plurality of magnetic poles are arranged on the side of the stator punchings close to the rotor punchings, a plurality of air gaps are formed between the side of the magnetic poles close to the rotor punchings and the outer annular surface of the rotor punchings, a plurality of concave structures are arranged on the side of the magnetic poles close to the rotor punchings, and the spacing of the air gaps is unequal.

[0007] The utility model is further configured as follows: the inner concave structure comprises a first arc-shaped portion and a second arc-shaped portion, and the first arc-shaped portion and the second arc-shaped portion are axially symmetrical along a central axis in a direction from the magnetic pole to the center of the rotor punching sheet.

[0008] The utility model is further configured as follows: a plurality of stator pole shoes are arranged at one end of the magnetic pole close to the rotor punching sheet, and the first arc-shaped portion and the second arc-shaped portion are located at one side of the stator pole shoe close to the rotor punching sheet.

[0009] The utility model is further configured as follows: the rotor punching is provided with a rotor inner hole whose center coincides with the rotor inner hole, and the rotor punching is provided with a plurality of first auxiliary grooves and second auxiliary grooves distributed in an array along the circumferential direction of the rotor inner hole.

[0010] The utility model is further configured as follows: the first auxiliary grooves and the second auxiliary grooves are alternately arranged.

[0011] The utility model is further configured as follows: the rotor punching is provided with a plurality of magnetic steel slots distributed in an array along the circumferential direction, permanent magnets are arranged in the magnetic steel slots, and the magnetic steel slots are arranged outside the first auxiliary slot and the second auxiliary slot.

[0012] The utility model is further configured as follows: the permanent magnet comprises a first arm and a second arm formed in one piece, and an angle is formed between the first arm and the second arm.

[0013] The utility model is further configured as follows: the magnetic steel groove is V-shaped, and the opening of the magnetic steel groove faces a direction away from the first auxiliary groove and the second auxiliary groove.

[0014] The utility model also discloses a scroll compressor, comprising any one of the above-mentioned unequal air gap motor structures.

[0015] In summary, the utility model has the following beneficial effects:

[0016] 1. The use of mutually symmetrical and identical concave structures not only reduces the difficulty of the manufacturing process while maintaining structural strength, and reduces production costs to a certain extent, but also increases the length of the air gap to form an unequal air gap structure. The expanded air gap changes the airflow dynamics, making the airflow inside the motor smoother, thereby reducing wind noise and mechanical noise during motor operation, thereby reducing the dynamic noise of the scroll compressor during operation, and improving the efficiency, performance and reliability of the scroll compressor.

[0017] 2. By opening the first auxiliary groove and the second auxiliary groove on the rotor punching, not only the mass of the stator punching is reduced, but also the cooling efficiency inside the motor is improved. When the scroll compressor is running, the addition of the first auxiliary groove and the second auxiliary groove can make the permanent magnet fully contact the refrigerant transported from the intake chamber to the compression chamber, which promotes the heat dissipation of the surface of the permanent magnet, thereby achieving the effect of reducing the temperature of the permanent magnet itself. By increasing the heat transfer and dissipation rate, the permanent magnet is kept in a good working state. When the permanent magnet works at a lower temperature, its magnetic properties are enhanced. Furthermore, the motor can provide higher torque and power output. At low temperatures, the risk of permanent magnet demagnetization is reduced, ensuring the safe operation of the motor, thereby improving the stability of the scroll compressor operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the utility model;

[0019] Figure 2 It is a schematic diagram of the structure of the stator punching sheet;

[0020] Figure 3 for Figure 2 The enlarged view of point A in the middle;

[0021] Figure 4 This is a schematic diagram of the structure of the rotor punching.

[0022] In the figure: 1. stator punching sheet; 11. stator inner hole; 2. rotor punching sheet; 21. rotor inner hole; 22. first auxiliary slot; 23. second auxiliary slot; 3. magnetic pole; 4. air gap; 5. first arc-shaped portion; 6. second arc-shaped portion; 7. stator pole shoe; 8. magnetic steel slot; 9. permanent magnet; 91. first arm; 92. second arm. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model; it is obvious that the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the utility model without making creative work are within the scope of protection of the utility model.

[0024] Example:

[0025] like Figure 1-Figure 3As shown, the unequal air gap motor structure includes a stator punching 1 and a rotor punching 2 which are the stationary part and the rotating part of the motor respectively. Multiple layers of rotor punchings 2 are stacked to form a rotor core. The interaction between the stator punching 1 and the rotor punching 2 produces the operation of the motor. The number of stator punchings 1 and rotor punchings 2 is set according to specific performance requirements such as required power, speed, starting characteristics and application occasions. The stator punching 1 is provided with a circular stator inner hole 11 with the center coinciding. The rotor punching 2 is arranged in the stator inner hole 11 to achieve electromagnetic interaction between each other. Twelve magnetic poles 3 are arranged on the side of the stator punching 1 close to the rotor punching 2. The magnetic poles 3 usually appear in pairs to form a complete magnetic field loop. The side of the magnetic pole 3 close to the rotor punching 2 forms a twenty-four-order air gap 4 structure with the outer ring surface of the rotor punching 2. The air gap 4 is a magnetic The field passage is the passage for converting electrical energy and mechanical energy. A concave structure is provided on the side of the magnetic pole 3 close to the rotor punching 2. The concave structure includes a first arc portion 5 and a second arc portion 6. The first arc portion 5 and the second arc portion 6 are axially symmetrical along the central axis of the magnetic pole 3 in the direction of the center of the rotor punching 2. The first arc portion 5 and the second arc portion 6 have the same shape and structure and are symmetrical to each other, so the processing difficulty is relatively low. It can also improve the uniformity of the distribution of the magnetic field on the rotor punching 2, reduce the vibration and noise problems caused by the uneven magnetic field, and also increase the contact area between the magnetic pole 3 and the rotor punching 2, and enhance the magnetic force transmission effect. By setting the concave structure, the gap between the magnetic pole 3 and the rotor punching 2 is reduced, thereby increasing the strength and stability of the magnetic field, which helps to improve the output power and efficiency of the motor and reduce energy loss.

[0026] like Figure 1 and Figure 3 As shown, a stator pole shoe 7 is provided at one end of the magnetic pole 3 close to the rotor punching 2. The stator pole shoe 7 can concentrate the magnetic flux and optimize the magnetic field shape in the air gap 4, thereby improving the power density and efficiency of the motor. The first arc portion 5 and the second arc portion 6 are located on the side of the stator pole shoe 7 close to the rotor punching 2, thereby forming unequal air gaps 4 between the arc surface of the stator pole shoe 7 close to the rotor punching 2 and the outer annular surface of the rotor punching 2. By setting the first arc portion 5 and the second arc portion 6, the length of the air gap 4 can be significantly increased to form an unequal air gap 4 structure, thereby reducing the noise during the operation of the motor, thereby reducing the noise during the operation of the scroll compressor.

[0027] like Figure 4As shown, the rotor punching 2 is provided with a rotor inner hole 21 with the center of the circle coinciding with the rotor inner hole 21, so that the rotor punching 2 can be stably installed on the motor shaft, ensuring the rotation accuracy and stability of the rotor punching 2. The rotor punching 2 is provided with six first auxiliary grooves 22 and six second auxiliary grooves 23 along the circumferential direction of the rotor inner hole 21. The first auxiliary grooves 22 and the second auxiliary grooves 23 are alternately arranged, forming a unique arrangement method, which can reduce the weight of the stator and reduce the load of the motor during operation, thereby reducing energy loss and improving the efficiency of the motor. The rotor punching 2 is provided with a plurality of V-shaped magnetic steel grooves 8 distributed in an array along the circumferential direction. The V-shaped structure of the magnetic steel groove 8 can better accommodate the permanent magnet 9 and improve the installation stability of the permanent magnet 9. The magnetic steel slot 8 is arranged on the outside of the first auxiliary slot 22 and the second auxiliary slot 23, and the V-shaped opening of the magnetic steel slot 8 faces the direction away from the first auxiliary slot 22 and the second auxiliary slot 23. A permanent magnet 9 is placed in the magnetic steel slot 8. The layout of the first auxiliary slot 22, the second auxiliary slot 23 and the magnetic steel slot 8 helps to guide the magnetic flux, enhance the magnetic field strength and distribution of the motor, thereby improving its efficiency and output performance. The permanent magnet 9 includes an integrally formed first arm 91 and a second arm 92. The integrated structure can reduce the difficulty of processing, ensure the firm connection between the various parts of the permanent magnet 9, reduce the errors caused by assembly, and improve the mechanical stability. An angle is formed between the first arm 91 and the second arm 92 to match the internal space layout of the motor and optimize the magnetic circuit.

[0028] like Figure 4 As shown, when the rotor assembly is working and rotating, it will drive the surrounding air to move, thereby increasing the air flow in the first auxiliary slot 22 and the second auxiliary slot 23, so that the permanent magnet 9 can fully contact the flowing air. Further, the heat on the surface of the permanent magnet 9 can be taken away by the air, thereby effectively reducing the temperature of the permanent magnet 9. The low-temperature permanent magnet 9 has stronger magnetic properties. The permanent magnet 9 with strong magnetic properties can provide a greater magnetic field strength, thereby increasing the torque and power of the motor. At the same time, the permanent magnet 9 at low temperatures also reduces the risk of demagnetization. Demagnetization refers to the phenomenon that the permanent magnet 9 loses its magnetism under high temperature or strong magnetic field. Demagnetization will cause the motor performance to decline or even fail to work normally. Therefore, by reducing the temperature of the permanent magnet 9, the safe operation of the motor can be guaranteed and the service life of the motor can be extended.

[0029] like Figure 1-Figure 4 As shown, by adjusting the structure of the stator pole shoe 7, increasing the length of the air gap 4 and realizing an unequal air gap 4 structure, the non-uniform air gap 4 structure helps to break the resonance frequency, avoid excessive amplification of sound waves, further reduce noise, and achieve NVH optimization effect. At the same time, by optimizing the distribution of cooling airflow, it also helps to maintain the appropriate temperature of the internal components of the motor, ensuring the stability and durability of the scroll compressor during long-term operation.

[0030] In one of the embodiments, the above-mentioned unequal air gap motor structure is applied to a scroll compressor, so that the airflow inside the motor is smoother, thereby reducing the wind noise and mechanical noise during the operation of the motor, thereby reducing the dynamic noise during the operation of the scroll compressor and effectively dissipating the heat of the motor through the refrigerant, thereby improving the efficiency, performance and reliability of the scroll compressor.

[0031] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

[0032] Finally, it should be noted that in the description of the present invention, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it 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, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An unequal air gap motor structure, comprising a plurality of stator laminations (1) and rotor laminations (2), characterized in that: The stator punching sheet (1) is provided with a stator inner hole (11), the rotor punching sheet (2) is located in the stator inner hole (11), a plurality of magnetic poles (3) are arranged on the side of the stator punching sheet (1) close to the rotor punching sheet (2), a plurality of air gaps (4) are formed between the side of the magnetic poles (3) close to the rotor punching sheet (2) and the outer ring surface of the rotor punching sheet (2), a plurality of concave structures are arranged on the side of the magnetic poles (3) close to the rotor punching sheet (2), and the spacings of the air gaps (4) are unequal.

2. The unequal air gap motor structure according to claim 1, characterized in that: The concave structure comprises a first arc-shaped portion (5) and a second arc-shaped portion (6), wherein the first arc-shaped portion (5) and the second arc-shaped portion (6) are axially symmetrical along a central axis in a direction from the magnetic pole (3) to the center of the rotor punching sheet (2).

3. The unequal air gap motor structure according to claim 2, characterized in that: A plurality of stator pole shoes (7) are arranged at one end of the magnetic pole (3) close to the rotor punching sheet (2), and the first arc-shaped portion (5) and the second arc-shaped portion (6) are located on one side of the stator pole shoe (7) close to the rotor punching sheet (2).

4. The unequal air gap motor structure according to claim 2 or 3, characterized in that: The rotor punching (2) is provided with a rotor inner hole (21) whose centers coincide with each other, and the rotor punching (2) is provided with a plurality of first auxiliary grooves (22) and second auxiliary grooves (23) distributed in an array along the circumferential direction of the rotor inner hole (21).

5. The unequal air gap motor structure according to claim 4, characterized in that: The first auxiliary grooves (22) and the second auxiliary grooves (23) are arranged alternately.

6. The unequal air gap motor structure according to claim 5, characterized in that: The rotor punching sheet (2) is provided with a plurality of magnetic steel slots (8) distributed in an array along a circumferential direction, permanent magnets (9) are arranged in the magnetic steel slots (8), and the magnetic steel slots (8) are arranged outside the first auxiliary slot (22) and the second auxiliary slot (23).

7. The unequal air gap motor structure according to claim 6, characterized in that: The permanent magnet (9) comprises a first arm (91) and a second arm (92) formed in one piece, and an angle is formed between the first arm (91) and the second arm (92).

8. The unequal air gap motor structure according to claim 6, characterized in that: The magnetic steel groove (8) is V-shaped, and the opening of the magnetic steel groove (8) faces a direction away from the first auxiliary groove (22) and the second auxiliary groove (23).

9. A scroll compressor, characterized in that: It includes the unequal air gap motor structure as described in any one of claims 1-8.

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