A motor rotor lamination

Abstract

The utility model discloses a motor rotor punching sheet, include: rotor punching sheet body, be provided with the V -shaped magnet slot that comprises by magnet slot on the rotor punching sheet body, be provided with a plurality of air gap groups outside the V -shaped magnet slot, the air gap group includes first air gap group and second air gap group, first air gap group with second air gap group with the midline of V -shaped magnet slot is the symmetry axis symmetry distribution, first air gap group with second air gap group respectively includes first air gap groove and second air gap groove, first air gap groove's first end to the clearance portion of rotor punching sheet body outer circumferential side is less than the first end to the clearance portion of rotor punching sheet body outer circumferential side of second air gap groove. The utility model discloses through optimizing rotor punching sheet structure, solved the problem that the motor operation noise is big in the prior art rotor structure.

Description

Technical Field

[0001] This utility model relates to the field of compressor technology, and in particular to a motor rotor lamination. Background Technology

[0002] As the core component of refrigeration equipment, the compressor is usually driven by an electric motor, and its energy consumption accounts for the majority of the overall operating energy consumption. In recent years, DC inverter technology has been widely used in the refrigeration industry to improve energy efficiency and operating performance, and the permanent magnet synchronous motor (PMSM) has become the preferred drive motor for variable frequency compressors due to its advantages such as high efficiency and high power density.

[0003] Traditional permanent magnet synchronous motor rotors are typically made by stacking uniformly shaped circular laminations. Some rotor laminations have magnetically insulating tangential structures between two adjacent magnetic poles to optimize the magnetic circuit. However, this rotor structure design easily introduces various harmonic magnetic fields of different orders into the air gap between the stator and rotor, resulting in a decrease in the sinusoidal nature of the motor's back EMF waveform. This further increases electromagnetic noise and affects the compressor's operational stability and quietness. Utility Model Content

[0004] The purpose of this invention is to provide a motor rotor lamination that optimizes the rotor lamination structure to solve the problem of high motor noise caused by the rotor structure in the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A motor rotor lamination includes: a rotor lamination body, a V-shaped magnet groove composed of magnet grooves is provided on the rotor lamination body, and a plurality of air gap units are provided on the outside of the V-shaped magnet groove, wherein the air gap unit includes a first air gap portion and a second air gap portion.

[0007] The first air gap and the second air gap are symmetrically distributed about the center line L of the two magnet grooves.

[0008] The first air gap portion and the second air gap portion respectively include a first air gap groove and a second air gap groove;

[0009] The gap a from the first end of the first air gap groove to the outer periphery of the rotor lamination body is smaller than the gap b from the first end of the second air gap groove to the outer periphery of the rotor lamination body.

[0010] Preferably, the first air gap groove and the second air gap groove are perpendicular to the magnet groove.

[0011] Preferably, the first air gap groove and the second air gap groove are arranged in parallel.

[0012] Preferably, the first air gap groove and the second air gap groove have the same size and shape.

[0013] Preferably, a plurality of self-locking tabs are provided on the rotor lamination body, and the self-locking tabs are located outside the V-shaped magnet groove.

[0014] Preferably, the self-locking tab is located on the center line L of the two magnetic grooves.

[0015] The beneficial effects of this utility model are:

[0016] (1) The present invention discloses a motor rotor lamination, which sets a plurality of air gap units on the rotor lamination body. The air gap units include a first air gap part and a second air gap part. The first air gap part and the second air gap part are symmetrically distributed with the center line of the two magnet slots as the axis of symmetry. The first air gap part and the second air gap part respectively include a first air gap slot and a second air gap slot. Through the design of these plurality of air gap slots, the present invention adjusts the distribution of the air gap magnetic field, suppresses high-order harmonics, thereby improving the sinusoidal nature of the back EMF waveform, greatly optimizing the electromagnetic performance of the motor, reducing torque pulsation and electromagnetic noise, solving the problem of high motor operating noise caused by rotor structure in the prior art, and improving the operating stability of the compressor.

[0017] (2) The motor rotor lamination disclosed in this utility model is designed such that the gap between the first end of the first air gap groove and the outer periphery of the rotor lamination body is smaller than the gap between the first end of the second air gap groove and the outer periphery of the rotor lamination body. In this utility model, several air gap grooves form different magnetic circuit channels from the outer side of the V-shaped magnet groove to the outer periphery of the rotor lamination body. The first air gap groove and the second air gap groove further form a regularly changing magnetic circuit channel from the outer periphery of the rotor lamination body, optimizing the magnetic circuit direction and making the magnetic circuit distribution more uniform, thereby reducing the torque pulsation of the motor, enhancing the motor torque output capability and power density, and effectively reducing the operating noise of the compressor. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural schematic diagram of a preferred embodiment of a motor rotor lamination according to the present invention;

[0019] Figure 2 This is a partial schematic diagram of a motor rotor lamination;

[0020] The components in the attached diagram are labeled as follows:

[0021] 1. Rotor lamination body; 2. Magnet slot; 3. First air gap; 31. First air gap slot; 4. Second air gap; 41. Second air gap slot; 5. Self-locking piece; 6. Gap a; 7. Gap b. Detailed Implementation

[0022] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.

[0023] This embodiment describes the structure of a motor rotor lamination.

[0024] like Figure 1 , 2 As shown, Figure 1 This is a three-dimensional structural schematic diagram of a preferred embodiment of a motor rotor lamination according to the present invention. Figure 2 This is a partial schematic diagram of a motor rotor lamination.

[0025] A motor rotor lamination includes: a rotor lamination body 1, on which a V-shaped magnetic groove composed of magnetic grooves 2 is provided, and a plurality of air gap units are provided on the outside of the V-shaped magnetic grooves. The air gap units include a first air gap portion 3 and a second air gap portion 4. The first air gap portion 3 and the second air gap portion 3 are symmetrically distributed about the center line L of the two magnetic grooves 2 as the axis of symmetry. The first air gap portion 3 and the second air gap portion 4 respectively include a first air gap groove 31 and a second air gap groove 41. The first air gap groove 31 and the second air gap groove 41 are respectively perpendicular to the magnetic grooves 2.

[0026] In a preferred embodiment, the first air gap groove 31 and the second air gap groove 41 are arranged in parallel, and the first air gap groove 31 and the second air gap groove 41 have the same size and shape.

[0027] In this invention, a first air gap 3 and a second air gap 4 are provided on the rotor lamination body 1. The first air gap 3 and the second air gap 4 respectively include a first air gap groove 31 and a second air gap groove 41. By providing these air gap grooves, the distribution of the air gap magnetic field is greatly adjusted, high-order harmonics are suppressed, thereby improving the sinusoidal nature of the back EMF waveform, greatly optimizing the electromagnetic performance of the motor, reducing torque pulsation and electromagnetic noise, solving the problem of high motor operating noise caused by the rotor structure in the prior art, and improving the operating stability of the compressor.

[0028] This invention also includes several self-locking tabs 5 on the rotor lamination body 1, the self-locking tabs 5 being located outside the V-shaped magnet slots. In a preferred embodiment, the self-locking tabs are located on the center line L of the two magnet slots. During rotor stacking, the self-locking tabs prevent the laminations from shifting or loosening axially (in the direction of the rotor axis), ensuring the overall stability of the stacked core and preventing the laminations from scattering due to centrifugal force or electromagnetic force during motor operation. This ensures the rigidity and stability of the rotor core and reduces vibration or noise.

[0029] In this invention, the gap a6 from the first end of the first air gap groove 31 to the outer periphery of the rotor lamination body 1 is smaller than the gap b7 from the first end of the second air gap groove 41 to the outer periphery of the rotor lamination body 1. The purpose of this is that, in this invention, several air gap grooves have already formed different magnetic circuit channels from the outer side of the V-shaped magnet groove to the outer periphery of the rotor lamination body. Furthermore, through the different gap spaces between the first and second air gap grooves and the outer periphery of the rotor lamination body, a regularly changing magnetic circuit channel is further formed, greatly optimizing the magnetic circuit orientation and making the magnetic circuit distribution more uniform. This reduces the torque pulsation of the motor, enhances the motor's torque output capability and power density, and effectively reduces the operating noise of the compressor.

[0030] In this embodiment, the first air gap groove and the second air gap groove are parallel to each other and perpendicular to the magnet groove, as shown below. Figure 2 As shown. In the gap a6 from the first end of the first air gap groove 31 to the outer periphery of the rotor lamination body 1, "first end" refers to the end of the first air gap groove near the outer circumference of the rotor lamination body, and gap a is the shortest distance formed from the first end to the outer periphery of the rotor lamination body. Similarly, in the gap b7 from the first end of the second air gap groove 41 to the outer periphery of the rotor lamination body 1, "first end" refers to the end of the second air gap groove near the outer circumference of the rotor lamination body, and gap b is the shortest distance formed from the first end to the outer periphery of the rotor lamination body. In this embodiment, gap a is designed to be smaller than gap b, forming magnetic circuits of different sizes, thus optimizing the magnetic circuit orientation.

[0031] This utility model is ingeniously conceived and has a simple structure. By optimizing the air gap groove structure on the rotor lamination, it reduces magnetic resistance, increases air gap magnetic flux density, and improves the smoothness of motor rotation, thereby achieving a quiet operation.

[0032] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A motor rotor lamination, characterized in that, include: The rotor lamination body (1) has a V-shaped magnet groove composed of magnet grooves (2) on the rotor lamination body (1), and a number of air gap units are provided on the outside of the V-shaped magnet groove. The air gap unit includes a first air gap part (3) and a second air gap part (4). The first air gap (3) and the second air gap (4) are symmetrically distributed with the center line L of the two magnet grooves (2) as the axis of symmetry; The first air gap (3) and the second air gap (4) respectively include a first air gap groove (31) and a second air gap groove (41); The gap a (6) from the first end of the first air gap groove (31) to the outer periphery of the rotor lamination body (1) is smaller than the gap b (7) from the first end of the second air gap groove (41) to the outer periphery of the rotor lamination body (1).

2. The motor rotor lamination according to claim 1, characterized in that: The first air gap groove (31) and the second air gap groove (41) are perpendicular to the magnet groove (2).

3. The motor rotor lamination according to claim 1, characterized in that: The first air gap groove (31) is arranged parallel to the second air gap groove (41).

4. The motor rotor lamination according to claim 1, characterized in that: The first air gap groove (31) and the second air gap groove (41) are the same in size and shape.

5. A motor rotor lamination according to claim 1, characterized in that: A plurality of self-locking pieces (5) are provided on the rotor lamination body (1), and the self-locking pieces (5) are located outside the V-shaped magnet groove.

6. A motor rotor lamination according to claim 5, characterized in that: The self-locking tab (5) is located on the center line L of the two magnetic grooves (2).

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