A new motor rotor lamination

Abstract

The utility model discloses a novel motor rotor punching sheet, including rotor punching sheet body, along the rotor punching sheet body circumference setting several V -shaped magnet grooves, the angle of V -shaped magnet groove is 140~150, set several air gap grooves on the rotor punching sheet body. The utility model optimizes the magnet groove design and air gap groove structure of rotor iron core, has improved the magnetic circuit trend, has reduced the magnetic resistance, and then has reduced the torque pulsation of motor, and effectively reduced the noise of compressor.

Description

Technical Field

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

[0002] Compressors are core components of appliances such as air conditioners and refrigerators, and most compressors are driven by electric motors, resulting in significant energy consumption. In recent years, DC inverter technology has become one of the leading technologies in the refrigeration industry, and permanent magnet synchronous motors have become the preferred choice for compressor motors. A permanent magnet synchronous motor for a DC inverter compressor consists of a stator and a rotor. Existing permanent magnet synchronous motor rotors are typically made of stacked, uniformly shaped circular laminations, with some laminations having magnetically insulating tangential edges between two adjacent rotor poles. This type of rotor lamination configuration often generates various harmonics of different orders in the stator-rotor air gap, degrading the sinusoidal nature of the motor's back EMF waveform and increasing torque pulsation and noise. Utility Model Content

[0003] The purpose of this invention is to provide a new type of motor rotor lamination that solves the problems of torque pulsation and high noise in the motor caused by the rotor lamination structure in the prior art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A novel motor rotor lamination includes a rotor lamination body, with a plurality of V-shaped magnetic grooves arranged circumferentially along the rotor lamination body, the angle of the V-shaped magnetic grooves being 140° to 150°.

[0006] Several air gap grooves are provided on the rotor lamination body.

[0007] Preferably, the air gap grooves are distributed circumferentially along the rotor lamination body, and the air gap grooves are located below the V-shaped magnet grooves.

[0008] Preferably, two sets of air gap grooves are provided below the V-shaped magnet groove, each set including two parallel air gap grooves, and the two sets of air gap grooves are symmetrically arranged.

[0009] Preferably, two magnets with the same polarity are placed in the V-shaped magnet slot, and the magnets in adjacent V-shaped magnet slots have opposite polarities.

[0010] Preferably, a stepped structure is provided in the V-shaped magnet groove to restrict the positions of the two magnets.

[0011] Preferably, a magnetic isolation bridge is provided at the edge of the V-shaped magnet groove and the arc-shaped edge of the rotor lamination body, and the width of the magnetic isolation bridge is 0.3mm to 0.8mm.

[0012] Preferably, a positioning groove is provided on the rotor lamination body.

[0013] Preferably, rivet holes are provided on the rotor lamination body.

[0014] The beneficial effects of this utility model are:

[0015] This utility model provides a novel motor rotor lamination, which features a V-shaped magnet groove and an air gap groove structure with a stepped structure on the rotor lamination body. This structural design effectively reduces magnetic resistance and increases air gap magnetic density. The air gap groove design makes the magnetic circuit distribution more uniform, thereby reducing the torque pulsation of the motor, enhancing the motor's torque output capability and power density, and effectively reducing the noise of the compressor. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a novel motor rotor lamination according to this utility model;

[0017] Figure 2 This is a comparison diagram of the magnetic circuit routes tested with and without air gaps in the preferred scheme;

[0018] Figure 3 This is a comparison diagram of the back EMF waveforms of the motor tested with and without an air gap in the preferred scheme;

[0019] Figure 4 This is a comparison chart of torque pulsation tests with and without air gap grooves in the preferred scheme;

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

[0021] 1. Rotor lamination body; 2. V-shaped magnet slot; 3. Air gap slot; 4. Stepped structure; 5. Magnetic bridge; 6. Positioning slot; 7. Rivet hole. 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] Example:

[0024] This embodiment introduces a novel type of motor rotor lamination.

[0025] Combination Figure 1 As shown, Figure 1This is a schematic diagram of the structure of a novel motor rotor lamination according to this utility model. The novel motor rotor lamination includes a rotor lamination body 1, with a plurality of V-shaped magnetic grooves 2 arranged circumferentially along the rotor lamination body 1. The angle of the V-shaped magnetic grooves 2 is 140° to 150°. A plurality of air gap grooves 3 are arranged on the rotor lamination body 1. The air gap grooves 3 are distributed circumferentially along the rotor lamination body 1 and are located below the V-shaped magnetic grooves 2.

[0026] In the preferred embodiment, two sets of air gap slots 3 are provided below the V-shaped magnet slot 2, each set including two parallel air gap slots 3, and the two sets of air gap slots are symmetrically arranged. By setting the air gap slots, the rotor magnetic circuit is adjusted, thereby improving motor efficiency and reducing noise.

[0027] In the preferred embodiment, two magnets with the same polarity are placed in the V-shaped magnet groove 2, and the magnets in adjacent V-shaped magnet grooves 2 have opposite polarities.

[0028] In the preferred embodiment, each V-shaped magnet groove 2 is a pole, and a total of eight V-shaped magnet grooves form eight poles. Sixteen neodymium iron boron magnets are placed in the V-shaped magnet grooves, and the eight poles are four pairs of poles.

[0029] The V-shaped magnet groove design effectively reduces magnetic resistance, increases air gap magnetic flux density, and enhances the motor's torque output capability and power density.

[0030] In the preferred embodiment, in order to isolate two magnets of the same polarity, make the two magnets form a certain angle, and limit the position of the two magnets, a step structure 4 is provided in the V-shaped magnet groove 2 to limit the position of the two magnets.

[0031] In the preferred embodiment, a magnetic isolation bridge 5 is provided at the edge of the V-shaped magnet slot 2 and the arc-shaped edge of the rotor lamination body 1. The width of the magnetic isolation bridge 5 is 0.3mm to 0.8mm. The design of the magnetic isolation bridge optimizes the magnetic circuit distribution, reduces magnetic leakage, and improves motor efficiency.

[0032] The rotor lamination body 1 is also provided with a positioning groove 6 to ensure the assembly accuracy of the front and back sides of the iron core and a rivet hole 7 for fixing multiple rotor lamination bodies.

[0033] Based on the optimized design, comparative tests were conducted on the novel rotor lamination. The magnetic circuit orientation, back EMF, and torque pulsation in the motor were compared between rotor laminations with and without air gap slots. Figure 2-4 As shown, Figure 2 This is a comparison diagram of the magnetic circuit routes tested with and without air gap slots in the preferred scheme. Figure 3 This is a comparison chart of the back EMF waveforms of the motor with and without an air gap in the preferred scheme. Figure 4This is a comparison chart of torque pulsation tests conducted on the preferred design with and without air gap slots. It can be seen that the rotor structure design with air gap slots has a more uniform magnetic circuit orientation compared to the design without air gap slots. The back EMF waveform of the motor is also superior, and the torque pulsation is significantly reduced compared to the rotor lamination structure without air gap slots.

[0034] Therefore, the structural design of this novel rotor lamination optimizes the magnetic circuit orientation, improves the back EMF waveform of the motor, and reduces torque pulsation. The design of the air gap slots optimizes the magnetic circuit orientation, thereby reducing the torque pulsation of the motor and effectively reducing compressor noise.

[0035] This invention provides a novel motor rotor lamination suitable for low-cost, high-performance air conditioning compressor motors. By optimizing the magnet slot design and air gap slot structure of the rotor core, magnetic reluctance is reduced, air gap magnetic flux density is increased, and the motor's torque output capability and power density are enhanced, while manufacturing costs are reduced. Furthermore, this structure is simple, offering advantages such as easy manufacturing process, low cost, and high efficiency.

[0036] 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 novel motor rotor lamination, characterized in that: It includes a rotor lamination body (1), and a plurality of V-shaped magnet grooves (2) are arranged along the circumference of the rotor lamination body (1), the angle of the V-shaped magnet grooves (2) being 140° to 150°; and a plurality of air gap grooves (3) are arranged on the rotor lamination body (1).

2. The novel motor rotor lamination according to claim 1, characterized in that: The air gap groove (3) is distributed circumferentially along the rotor lamination body (1), and the air gap groove (3) is located below the V-shaped magnet groove (2).

3. The novel motor rotor lamination according to claim 1, characterized in that: Two sets of air gap grooves (3) are provided below the V-shaped magnet groove (2), each set including two parallel air gap grooves (3), and the two sets of air gap grooves are symmetrically arranged.

4. The novel motor rotor lamination according to claim 1, characterized in that: Two magnets with the same polarity are placed in the V-shaped magnet groove (2), and the magnets in adjacent V-shaped magnet grooves (2) have opposite polarities.

5. A novel motor rotor lamination according to claim 3, characterized in that: A stepped structure (4) is provided in the V-shaped magnet groove (2) to restrict the positions of the two magnets.

6. A novel motor rotor lamination according to claim 1, characterized in that: A magnetic isolation bridge (5) is provided at the edge of the V-shaped magnet groove (2) and the arc-shaped edge of the rotor lamination body (1), and the width of the magnetic isolation bridge (5) is 0.3mm to 0.8mm.

7. A novel motor rotor lamination according to claim 1, characterized in that: A positioning groove (6) is provided on the rotor lamination body (1).

8. A novel motor rotor lamination according to claim 1, characterized in that: Rivet holes (7) are provided on the rotor lamination body (1).

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