Low-noise high-efficiency motor structure and scroll compressor

Abstract

The utility model discloses a low-noise high-efficiency motor structure and a scroll compressor, belongs to the technical field of compressors, and aims to solve the problems of poor electromagnetic noise and poor operation efficiency of a motor for a scroll compressor. According to the technical scheme, the motor is characterized by comprising a plurality of stator punching sheets and rotor punching sheets, stator inner holes are formed in the stator punching sheets, the rotor punching sheets are located in the stator inner holes, a plurality of magnetic poles are arranged on the sides, close to the rotor punching sheets, of the stator punching sheets, and a plurality of air gaps are formed between the cambered surfaces, close to the rotor punching sheets, of the magnetic poles and the outer ring surfaces of the rotor punching sheets; the rotor punching sheet is concentrically provided with a rotating shaft hole, the outer ring surface of the rotor punching sheet is composed of a plurality of arcs connected end to end, and the circle center of at least part of the arcs does not coincide with the circle center of the rotating shaft hole, so that the length of an air gap between the stator punching sheet and the rotor punching sheet is increased, and an unequal-distance air gap structure is realized. The formation of the non-equidistant air gaps is helpful for perfecting the positive rotation of the back electromotive force waveform, so that the torque ripple is reduced, the overall performance is improved, and the effect of reducing the electromagnetic noise is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of compressors, and more specifically to a low-noise and high-efficiency motor structure and a scroll compressor. Background Art

[0002] In scroll compressors, the air gap between the stator and rotor laminations is one of the key parameters of motor performance. The air gap refers to the radial distance between the inner surface of the motor stator lamination and the outer surface of the rotor lamination. This gap not only provides the necessary space for mechanical operation and avoids physical contact between the stator and rotor laminations, but also affects the electromagnetic performance of the motor. The air gap acts as a passage for the magnetic field, allowing magnetic flux to pass through and plays a key role in the energy conversion process of the motor. When the motor is running, electrical energy is converted into magnetic force through the stator coil, and the magnetic force acts on the rotor lamination through the air gap, and then converted into mechanical energy to drive the load.

[0003] Therefore, the size of the air gap will affect the magnetic resistance of the motor, that is, the degree of obstruction to the magnetic flux. When the air gap is larger, the magnetic resistance increases, resulting in a decrease in the density of magnetic flux lines passing through the air gap under the same magnetomotive force (the product of current and number of coil turns), thereby weakening the magnetic field strength inside the motor, which further affects the performance of the motor, reduces motor efficiency, increases losses, and reduces output power.

[0004] Traditional rotor cores usually adopt a concentric arc structure design, which will lead to torque pulsation problems. That is, the torque generated when the rotor punching rotates is not constant, but fluctuates. Torque pulsation will not only cause unstable operation, but also increase noise and vibration, thereby affecting the motor life and user experience. Therefore, a new solution is needed to solve the problems of electromagnetic noise and poor operating efficiency of scroll compressor motors. Utility Model Content

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a low-noise and high-efficiency motor structure, which can reduce the electromagnetic noise of the motor for the scroll compressor and improve the operating efficiency of the motor through the setting of the structure.

[0006] The above technical objectives of the utility model are achieved through the following technical solutions: a low-noise and high-efficiency 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 arc surface of the magnetic poles close to the rotor punchings and the outer ring surface of the rotor punchings, the rotor punchings are concentrically provided with a shaft hole, the outer ring surface of the rotor punchings is composed of a plurality of circular arcs connected end to end, and the center of at least some of the arcs does not coincide with the center of the shaft hole.

[0007] The utility model is further configured as follows: the arc whose center does not coincide with the center of the shaft hole (21) is defined as a first arc structure, and the arc whose center coincides with the center of the shaft hole (21) is defined as a second arc structure, and the first arc structure and the second arc structure are arranged at an interval.

[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.

[0009] The utility model is further configured as follows: the rotor punching sheet is provided with a plurality of magnetic steel slots distributed in an array along a circumferential direction, and the magnetic steel slots are arranged near the edge of the rotor punching sheet.

[0010] 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.

[0011] The utility model is further configured as follows: the magnetic steel groove is V-shaped, and the opening of the magnetic steel groove faces the circumferential direction of the rotor punching sheet.

[0012] The utility model is further configured as follows: the distance between the center of the rotating shaft hole along the central axis direction of the opening of the magnetic steel slot and the outer ring surface of the rotor punching is set to length one, and the distance between the center of the rotating shaft hole along the central axis direction between two adjacent magnetic steel slots and the outer ring surface of the rotor punching is set to length two, and the length one is greater than the length two.

[0013] The utility model is further configured as follows: a plurality of magnetic density auxiliary grooves are provided between the angles of the magnetic steel grooves, and two adjacent magnetic density auxiliary grooves are symmetrically arranged along the central axis of the opening of the magnetic steel groove.

[0014] The utility model is further configured as follows: the magnetic density auxiliary groove is configured as a waist shape, and the opening directions of two adjacent magnetic density auxiliary grooves are opposite.

[0015] The utility model also discloses a scroll compressor, comprising any one of the above-mentioned low-noise and high-efficiency motor structures.

[0016] In summary, the utility model has the following beneficial effects:

[0017] 1. By optimizing the air gap size and rotor punching structure, the air gap length between the stator punching and the rotor punching is increased and an unequal air gap structure is achieved. The formation of unequal air gaps helps to improve the positive rotation of the back electromotive force waveform, thereby reducing torque pulsation and improving overall performance, thereby reducing electromagnetic noise;

[0018] 2. By opening V-shaped magnetic steel slots and magnetic flux auxiliary slots, the magnetic circuit of the motor is optimized, the change of air gap magnetic resistance is reduced, the motor runs more smoothly, the stability of the magnetic steel slots and the guidance of the magnetic circuit are enhanced, the uniform magnetic flux distribution is achieved and the relative magnetic field strength is increased, which effectively reduces the noise caused by local magnetic flux saturation, thereby improving the effective output of the motor and achieving efficient operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the utility model;

[0020] Figure 2 It is a schematic diagram of the structure of the stator punching sheet;

[0021] Figure 3 It is a schematic diagram of the structure of the rotor punching;

[0022] Figure 4 for Figure 3 The enlarged view of point A in the middle;

[0023] Figure 5 This is the effect diagram of the magnetic field strength after homogenization.

[0024] In the figure: 1, stator punching sheet; 11, stator inner hole; 2, rotor punching sheet; 21, shaft hole; 3, magnetic pole; 4, air gap; 5, stator pole shoe; 6, magnetic steel slot; 61, permanent magnet; 611, first arm; 612, second arm; 7, magnetic flux auxiliary slot; L1, length one; L2, length two. DETAILED DESCRIPTION

[0025] 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.

[0026] Example:

[0027] like Figure 1 and Figure 2As shown, the low-noise and high-efficiency 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. The interaction between the stator punching 1 and the rotor punching 2 generates 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 outer ring surface of the rotor punching 2 is formed by integral stamping to form a structure in which a plurality of first arc structures that do not coincide with the center of the rotor inner hole 31 are connected end to end, or a structure in which a first arc structure that does not coincide with the center of the rotor inner hole 31 and a second arc structure that coincides with the center are arranged at intervals. Multiple layers of rotor punchings 2 are stacked to form a rotor core. The stator punching 1 is provided with a circular stator inner hole 11 with a coincident center. 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 circuit, a plurality of air gaps 4 are formed between the side of the magnetic pole 3 close to the rotor sheet 2 and the outer ring surface of the rotor sheet 2. The air gap 4 is the passage of the magnetic field and the passage for converting electrical energy and mechanical energy. The magnetic pole 3 is provided with a stator pole shoe 5 at one end close to the rotor sheet 2. The stator pole shoe 5 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 arc surface of the stator pole shoe 5 close to the rotor sheet 2 and the outer ring surface of the rotor sheet 2 form unequally spaced air gaps 4. The outer ring surface structure of the rotor sheet 2 makes the length of the air gap 4 different at different positions, thereby increasing the length of the air gap 4, and can reduce the rate of change of the magnetic flux between the rotor sheet 2 and the stator sheet 1, thereby helping to reduce electromagnetic noise, and can optimize the sinusoidality of the back electromotive force waveform without sacrificing efficiency. The closer the back electromotive force waveform is to the ideal sine wave, the smaller the torque pulsation is, which helps the motor to run more smoothly and reduce the noise level.

[0028] like Figure 1 and Figure 2 As shown, the rotor punching 2 constitutes a part of the motor magnetic circuit. A circular shaft hole 21 is opened in the middle of the rotor punching 2 for installing the shaft and ensuring that the rotor punching 2 can rotate on the shaft. The shaft hole 21 is centered to ensure the balance and stability of the rotor punching 2. The outer ring surface of the rotor punching 2 is composed of eight circular arcs that do not coincide with the center of the shaft hole 21. An unequally spaced air gap 4 structure with a minimum air gap 4 and a maximum air gap 4 is formed between the outer ring surface of the rotor punching 2 and the stator inner hole 11. Preferably, the maximum air gap 4 is 1.2 mm, and the minimum air gap 4 is 0.55 mm, achieving an air gap 4 transition of 0.65 mm, realizing a back electromotive force waveform with better positive rotation, reducing the torque pulsation generated thereby, and thus reducing the noise during motor operation. Through this structure of unequally spaced air gaps 4, iron loss and magnetic resistance can be reduced, thereby reducing energy loss. Furthermore, the unequally spaced structure of the air gap 4 can reduce motor noise, making the scroll compressor motor more suitable for applications requiring a quiet environment.

[0029] like Figure 1 and Figure 4 As shown, the rotor punching 2 is provided with a plurality of V-shaped magnetic steel slots 6 distributed in an array along the circumferential direction. The magnetic steel slots 6 are arranged near the edge of the rotor punching 2, and the V-shaped openings of the magnetic steel slots 6 face the circumferential direction of the rotor punching 2. Permanent magnets 61 are placed in the magnetic steel slots 6. The layout of the magnetic steel slots 6 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 61 includes an integrally formed first arm 611 and a second arm 612. The integrated structure can reduce the difficulty of processing, ensure the firm connection between the various parts of the permanent magnet 61, reduce errors caused by assembly, and improve mechanical stability. An angle is formed between the first arm 611 and the second arm 612 to match the internal spatial layout of the motor and optimize the magnetic circuit.

[0030] like Figure 1 and Figure 3 As shown, the distance between the center of the shaft hole 21 and the outer ring surface of the rotor punching 2 is directly related to the size and uniformity of the air gap 4. The distance between the center of the shaft hole 21 and the outer ring surface of the rotor punching 2 along the central axis direction of the opening of the magnetic steel slot 6 is set to a length of L1, and the distance between the center of the shaft hole 21 and the outer ring surface of the rotor punching 2 along the central axis direction between two adjacent magnetic steel slots 6 is set to a length of L2. The length L1 is greater than the length L2. Preferably, the length L1 is 31.75mm, and the length L2 is 31.65mm, thereby forming a rotor punching 2 with a non-concentric arc structure, so that the air gap 4 is unequally spaced, thereby affecting the distribution of the magnetic resistance of the air gap 4. The magnetic steel slot 6 structure and the size of the air gap 4 are beneficial to improving the starting performance and speed regulation range of the motor, and can effectively reduce the noise and vibration generated during the operation of the motor while maintaining the high efficiency and high performance of the motor.

[0031] like Figure 4-Figure 5 As shown, two waist-shaped magnetic flux auxiliary slots 7 are provided between the angles of each magnetic steel slot 6, thereby optimizing the magnetic field generated by the rotor punching 2 and improving the motor efficiency, helping to guide and concentrate the magnetic flux, and also compensating for the partial magnetic flux unsaturated magnetic field area caused by the shape of the magnetic steel slot 6. The opening directions of the two magnetic flux auxiliary slots 7 are opposite, and are symmetrically arranged along the central axis of the opening of the magnetic steel slot 6, thereby reducing the magnetic flux at the position of the air gap 4, improving the uniformity of the magnetic field distribution, enhancing the magnetic field between adjacent magnetic steel slots 6, reducing magnetic leakage, and thus providing a more uniform and dense magnetic flux. Figure 5It can be seen that reducing the magnetic flux density at the position of air gap 4 improves the uniformity of the magnetic field distribution. When the magnetic flux density is uniform, the electromagnetic energy conversion process inside the motor is smoother, thereby improving the efficiency and output performance of the motor and reducing the noise during the operation of the motor, that is, improving NVH. At the same time, the increased relative magnetic field strength can also improve the torque output capacity of the motor. The motor can achieve efficient operation under a variety of load conditions, so that the motor can improve the overall efficiency and reliability of the scroll compressor while maintaining a compact size.

[0032] like Figure 1-Figure 5 As shown, the low-noise and high-efficiency motor structure optimizes the magnetic circuit of the motor through the layout of the unequally spaced air gap 4 structure and the V-shaped magnetic steel slot 6, reduces the change of the magnetic resistance of the air gap 4, makes the motor run more smoothly, enhances the stability of the magnetic steel slot 6 and the guidance of the magnetic circuit, and effectively reduces the noise caused by local magnetic density saturation, thereby improving the effective output of the motor and achieving efficient operation.

[0033] In one of the embodiments, applying the above-mentioned low-noise and high-efficiency motor structure to a scroll compressor can reduce the electromagnetic noise during the operation of the scroll compressor, thereby improving the NVH of the scroll compressor and reducing the noise reduction requirements of the scroll compressor.

[0034] 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.

[0035] 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.

[0036] 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. A low-noise and high-efficiency motor structure, comprising a plurality of stator punchings (1) and rotor punchings (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 a side of the stator punching sheet (1) close to the rotor punching sheet (2), a plurality of air gaps (4) are formed between the arc surface of the magnetic poles (3) close to the rotor punching sheet (2) and the outer ring surface of the rotor punching sheet (2), the rotor punching sheet (2) is cocentrically provided with a rotating shaft hole (21), the outer ring surface of the rotor punching sheet (2) is composed of a plurality of circular arcs connected end to end, and the center of at least some of the circular arcs does not coincide with the center of the rotating shaft hole (21).

2. A low-noise and high-efficiency motor structure according to claim 1, characterized in that: The arc whose center does not coincide with the center of the shaft hole (21) is defined as a first arc structure, and the arc whose center coincides with the center of the shaft hole (21) is defined as a second arc structure, and the first arc structure and the second arc structure are arranged at an interval.

3. A low-noise and high-efficiency motor structure according to claim 1 or 2, characterized in that: The magnetic pole (3) is provided with a plurality of stator pole shoes (5) at one end close to the rotor punching sheet (2).

4. A low-noise and high-efficiency motor structure according to claim 3, characterized in that: The rotor punching sheet (2) is provided with a plurality of magnetic steel slots (6) distributed in an array along a circumferential direction, the magnetic steel slots (6) are arranged near the edge of the rotor punching sheet (2), and permanent magnets (61) are arranged in the magnetic steel slots (6).

5. A low-noise and high-efficiency motor structure according to claim 4, characterized in that: The permanent magnet (61) comprises a first arm (611) and a second arm (612) formed in one piece, and an angle is formed between the first arm (611) and the second arm (612).

6. A low-noise and high-efficiency motor structure according to claim 4, characterized in that: The magnetic steel slot (6) is V-shaped, and the opening of the magnetic steel slot (6) faces the circumferential direction of the rotor punching sheet (2).

7. A low-noise and high-efficiency motor structure according to claim 6, characterized in that: The distance between the center of the rotating shaft hole (21) along the central axis direction of the opening of the magnetic steel slot (6) and the outer ring surface of the rotor punching (2) is set to length one, and the distance between the center of the rotating shaft hole (21) along the central axis direction between two adjacent magnetic steel slots (6) and the outer ring surface of the rotor punching (2) is set to length two, and the length one is greater than the length two.

8. A low-noise and high-efficiency motor structure according to claim 5 or 6, characterized in that: A plurality of magnetic density auxiliary grooves (7) are provided between the angles of the magnetic steel grooves (6), and two adjacent magnetic density auxiliary grooves (7) are symmetrically arranged along the central axis of the opening of the magnetic steel groove (6).

9. A low-noise and high-efficiency motor structure according to claim 8, characterized in that: The magnetic flux density auxiliary grooves (7) are arranged in a waist shape, and the opening directions of two adjacent magnetic flux density auxiliary grooves (7) are opposite to each other.

10. A scroll compressor, characterized in that: It comprises the low-noise and high-efficiency motor structure as described in any one of claims 1 to 9.

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