Permanent magnet motor rotor lamination, rotor core, rotor and permanent magnet motor

Abstract

The utility model belongs to permanent magnet synchronous motor technical field, concretely relates to permanent magnet motor rotor punching sheet, rotor core, rotor and permanent magnet motor. In view of the unreasonable setting of the magnetic separation slot of the magnetic separation bridge of the existing permanent magnet motor rotor, the utility model uses the following technical scheme: permanent magnet motor rotor punching sheet, including punching sheet body, the permanent magnet slot, the magnetic separation slot, the central shaft hole are set up on the punching sheet body, wherein, the permanent magnet slot has multiple and is radially distributed in circle on the punching sheet body, and the magnetic separation slot has multiple and is distributed in circle on the punching sheet body, wherein, each magnetic separation slot is located between the adjacent permanent magnet slot respectively, each magnetic separation slot includes the radial magnetic separation part between the circumferential of adjacent permanent magnet slot and the circumferential magnetic separation part between the permanent magnet slot and the shaft hole, and the radial magnetic separation part and the circumferential magnetic separation part are connected. The beneficial effect of the utility model's permanent magnet motor rotor punching sheet is: reduce permanent magnet leakage, and it is easier to process and / or the structure strength is better.

Description

Technical Field

[0001] This utility model belongs to the field of permanent magnet synchronous motor technology, specifically relating to permanent magnet motor rotor laminations, rotor cores, rotors, and permanent magnet motors. Background Technology

[0002] Existing permanent magnet synchronous motors (see [reference]) Figure 1 The inner ends of the magnets are equipped with magnetic isolation bridges, which have a certain thickness (radial dimension). The magnetic circuit of the yoke is prone to forming a magnetic loop through the rotating shaft, resulting in serious magnetic leakage at the magnetic isolation bridge, a large magnetic leakage coefficient, and a low motor power factor. Summary of the Invention

[0003] This invention addresses the shortcomings of existing permanent magnet motor rotors in terms of magnetic shielding performance by providing a permanent magnet motor rotor lamination. Through structural improvements such as removing the magnetic shielding bridge at the inner end of the magnet, the magnetic shielding effect is improved. This invention also provides a rotor core, a rotor, and a permanent magnet motor.

[0004] To achieve the above objectives, this utility model adopts the following technical solution: a permanent magnet motor rotor lamination, the permanent magnet motor rotor lamination comprising a lamination body, wherein the lamination body has the following openings: Central shaft hole; Permanent magnet slot; Among them, there are multiple permanent magnet slots that are radially and evenly distributed on the stamping body, and multiple magnetic isolation slots that are evenly distributed on the stamping body. The inner end of the permanent magnet groove is connected to the central shaft hole.

[0005] This invention relates to a permanent magnet motor rotor lamination where the inner end of the permanent magnet slot on the lamination body is connected to the central shaft hole. Compared to existing rotor laminations, which have a magnetic isolation bridge at the inner end of the permanent magnet slot, this design reduces magnetic leakage of the permanent magnet, improves the magnetic flux path of the permanent magnet motor rotor, and is easier to manufacture with less material. For the same dimensions, this product reduces magnetic leakage coefficient by approximately 25% and increases torque by approximately 20%.

[0006] As an improvement, the radial inner end of the permanent magnet slot is fully connected to the central shaft hole.

[0007] As an improvement, the radial outer end of the permanent magnet slot is closed.

[0008] As an improvement, the radial outer end of the permanent magnet slot is formed into an isosceles trapezoidal slot that is larger on the outside and smaller on the inside.

[0009] As an improvement, the permanent magnet slot is rectangular.

[0010] As an improvement, multiple mounting holes are also evenly distributed around the circumference of the lamination body.

[0011] The permanent magnet motor rotor core includes multiple stacked rotor laminations, which are the aforementioned permanent magnet motor rotor laminations.

[0012] The permanent magnet motor rotor includes a rotor core, which is the aforementioned permanent magnet motor rotor core. The permanent magnet motor rotor also includes a permanent magnet disposed in a permanent magnet slot and a rotating shaft in a central shaft hole. There is a magnetic isolation gap between the radial inner end of the permanent magnet and the rotating shaft. The rotating shaft is a non-magnetic rotating shaft.

[0013] As an improvement to the permanent magnet motor rotor, the minimum size of the magnetic isolation gap between the radial inner end of the permanent magnet and the shaft is 0-0.4mm.

[0014] The permanent magnet motor includes a stator and a rotor. The stator includes a stator core, which includes stator laminations. The stator laminations have multiple stator slots evenly distributed around the circumference, and the inner ends of the stator slots are open. The rotor is the aforementioned permanent magnet motor rotor. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a rotor lamination and stator lamination for an existing permanent magnet motor.

[0016] Figure 2 This is a schematic diagram of the structure of the rotor lamination and stator lamination of the permanent magnet motor according to Embodiment 1 of this utility model.

[0017] Figure 3 This is a schematic diagram of the structure of the permanent magnet motor rotor lamination in Embodiment 1 of this utility model.

[0018] Figure 4 This is a cross-sectional view of the permanent magnet motor rotor of Embodiment 1 of this utility model.

[0019] Figure 5 This is a simulation of the magnetic field lines of the permanent magnet motor of Embodiment 1 of this utility model.

[0020] Figure 6 It was obtained through simulation. Figure 1 The image shows a magnetic density cloud diagram of an existing permanent magnet motor.

[0021] Figure 7 This is a simulation of the magnetic field lines of the permanent magnet motor of Embodiment 1 of this utility model.

[0022] Figure 8 It was obtained through simulation. Figure 1 The diagram shows the magnetic field lines of an existing permanent magnet motor.

[0023] Figure 9 This is a comparison diagram of the input and output power of the permanent magnet motor of Embodiment 1 of this utility model obtained by simulation.

[0024] Figure 10 It was obtained through simulation. Figure 1 The diagram shows a comparison of the input and output power of an existing permanent magnet motor.

[0025] In the diagram, 1 is the rotor lamination; 11 is the lamination body; 12 is the central shaft hole; 13 is the permanent magnet slot; 14 isosceles trapezoidal slot; and 15 is the mounting hole. 2. Permanent magnet; 3. Shaft; 4. Stator laminations. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be explained and described below. However, the following embodiments are only preferred embodiments of the present invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of the present invention.

[0027] See Figures 2 to 4 The permanent magnet motor rotor lamination of this utility model embodiment includes a lamination body, on which the following are formed: Central shaft hole; Permanent magnet slot; Among them, there are multiple permanent magnet slots that are radially and evenly distributed on the stamping body, and multiple magnetic isolation slots that are evenly distributed on the stamping body. The inner end of the permanent magnet groove is connected to the central shaft hole.

[0028] In this embodiment of the permanent magnet motor rotor lamination, the inner end of the permanent magnet slot on the lamination body is connected to the central shaft hole. Compared with existing rotor laminations, which have a magnetic isolation bridge at the inner end of the permanent magnet slot, this reduces magnetic leakage of the permanent magnet and improves the magnetic flux path of the permanent magnet motor rotor; it is also easier to process and uses less material. Under the same size, this product reduces the magnetic leakage coefficient by about 25% and increases the torque by about 20%.

[0029] Example 1 See Figures 2 to 4 According to Embodiment 1 of this utility model, a permanent magnet motor includes a stator and a rotor. The rotor includes a rotor core, and the rotor core includes a rotor lamination 1. The rotor lamination 1 includes a lamination body 11. The lamination body 11 has a central shaft hole 12 and permanent magnet slots 13. There are multiple permanent magnet slots 13 that are radially and evenly distributed on the lamination body 11. There are also multiple magnetic isolation slots that are evenly distributed on the lamination body 11. The inner end of the permanent magnet slot 13 is connected to the central shaft hole 12. The rotor also includes a permanent magnet 2 disposed in the permanent magnet slot 13 and a rotating shaft 3 disposed in the central shaft hole 12. There is a magnetic isolation gap between the radial inner end of the permanent magnet 2 and the rotating shaft 3. The rotating shaft 3 is a non-magnetic rotating shaft 3.

[0030] In this embodiment, the minimum size of the magnetic isolation gap between the radial inner end of the permanent magnet 2 and the rotating shaft 3 is 0-0.4 mm. The magnetic isolation gap is... Figure 6 Regarding the distance G in the magnetic shielding gap, if (assuming after assembly) the magnetic shielding gap is too small (less than 0), interference between the radial inner end of the permanent magnet 2 and the rotating shaft 3 may occur due to machining and assembly errors. If the magnetic shielding gap is too large (greater than 0.4mm), although the radial inner end of the permanent magnet 2 will not interfere with the rotating shaft 3, the excessive distance will affect the size of the rotor lamination 1 (the rotor lamination 1 will be larger under the same parameter requirements). A magnetic shielding gap of 0.2mm is preferable.

[0031] In this embodiment, the stator includes a stator core, and the stator core includes stator laminations 4. The stator laminations 4 have multiple stator slots evenly distributed around their circumference, and the inner ends of the stator slots are open. The stator in this embodiment is the same as or may be the same as the stator in the prior art.

[0032] In this embodiment, the radial inner end of the permanent magnet groove 13 is fully connected to the central shaft hole 12. In other embodiments, the radial inner end of the permanent magnet groove 13 may only be partially connected to the central shaft hole 12, for example, by forming a small protrusion between the inner ends of the two radial sidewalls of the permanent magnet groove 13.

[0033] In this embodiment, the radial outer end of the permanent magnet groove 13 is closed.

[0034] In this embodiment, the radial outer end of the permanent magnet groove 13 forms an isosceles trapezoidal groove 14 that is larger on the outside and smaller on the inside.

[0035] In this embodiment, the permanent magnet groove 13 is rectangular, and the permanent magnet 2 is also rectangular, as rectangular permanent magnet 2 is easy to process. In other embodiments, the permanent magnet groove 13 can also be trapezoidal or other shapes.

[0036] In this embodiment, a plurality of mounting holes 15 are evenly distributed around the circumference on the lamination body 11. The mounting holes 15 are used for the stacked connection of a plurality of rotor laminations 1.

[0037] In this embodiment, the permanent magnet 2 is a magnetic steel.

[0038] In this embodiment, the lamination body 11 is a silicon steel sheet.

[0039] See Figure 5 and Figure 6 From the magnetic field cloud map, it can be seen that... Figure 8 Compared to existing permanent magnet motors, Figure 7 As shown in this embodiment of the permanent magnet motor, the magnetic leakage from both sides of the pole shoes to the rotor is significantly increased.

[0040] See Figure 7 and Figure 8The magnetic field diagram shows that the permanent magnet motor in this embodiment has very little magnetic leakage at the rotor, while the existing permanent magnet motor has more serious magnetic leakage at the rotor.

[0041] See Figure 9 and Figure 10 The graph compares the input power and output power. In the graph, the horizontal axis represents time, the vertical axis represents output power, the red line represents input power, and the green line represents output power. Figure 9 In this embodiment, the ratio of the output power to the input power of the permanent magnet motor is approximately 750W / 806W = 87.2%. Figure 10 In existing permanent magnet motors, when the output is 750W, the ratio of output power to input power is approximately 750W / 936.7W=80%.

[0042] The beneficial effects of the permanent magnet motor in Embodiment 1 of this utility model are as follows: the inner end of the permanent magnet slot 13 on the lamination body 11 of the rotor lamination 1 is connected to the central shaft hole 12; the radial inner end of the permanent magnet 2 has a magnetic isolation gap between it and the rotating shaft 3; the rotating shaft 3 is a non-magnetic rotating shaft 3. The setting of the magnetic isolation gap increases the magnetic resistance of the leakage magnetic circuit, which can significantly reduce leakage magnetic flux, allowing more magnetic flux to be concentrated in the working area of ​​the motor, thereby improving the efficiency and performance of the motor; through the innovative inner ring air magnetic isolation and non-magnetic rotating shaft 3 structure, the utilization rate of the magnetic properties of the magnet is greatly improved; material costs are saved; processing difficulty is reduced; although the structural strength is slightly reduced, it has been verified that it can meet the relevant requirements.

[0043] This embodiment also provides a permanent magnet motor rotor core, including multiple stacked rotor laminations 1, wherein the rotor laminations 1 are the aforementioned permanent magnet motor rotor laminations 1.

[0044] This embodiment also provides a permanent magnet motor rotor, including a rotor core, which is the aforementioned permanent magnet motor rotor core, and the permanent magnet motor rotor also includes a permanent magnet 2 disposed in the permanent magnet slot 13.

[0045] This embodiment also provides a permanent magnet motor rotor lamination 1, which includes a lamination body 11, on which the following are formed: Central shaft hole 12; Permanent magnet slot 13; Among them, there are multiple permanent magnet slots 13 that are radially and evenly distributed on the stamping body 11, and there are multiple magnetic isolation slots that are evenly distributed on the stamping body 11. The inner end of the permanent magnet groove 13 is connected to the central shaft hole 12.

[0046] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes, but is not limited to, the content described in the above specific embodiments. Any modifications that do not depart from the functional and structural principles of the present invention will be included within the scope of the claims.

Claims

1. A permanent magnet motor rotor lamination (1), characterized in that: The permanent magnet motor rotor lamination (1) includes a lamination body (11), on which: Central shaft hole (12); Permanent magnet slot (13); Among them, there are multiple permanent magnet slots (13) that are evenly distributed circumferentially on the lamination body (11) in a radial pattern; The inner end of the permanent magnet groove (13) is connected to the central shaft hole (12), and a magnetic isolation gap is formed between the permanent magnet groove (13) and the central shaft hole (12). There are multiple magnetic isolation gaps and they are evenly distributed on the circumference of the lamination body (11).

2. The permanent magnet motor rotor lamination (1) according to claim 1, characterized in that: The radial inner end of the permanent magnet groove (13) is fully connected to the central shaft hole (12).

3. The permanent magnet motor rotor lamination (1) according to claim 1, characterized in that: The radial outer end of the permanent magnet groove (13) is closed.

4. The permanent magnet motor rotor lamination (1) according to claim 1, characterized in that: The radial outer end of the permanent magnet groove (13) forms an isosceles trapezoidal groove (14) that is larger on the outside and smaller on the inside.

5. The permanent magnet motor rotor lamination (1) according to claim 1, characterized in that: The permanent magnet slot (13) is rectangular.

6. The permanent magnet motor rotor lamination (1) according to claim 1, characterized in that: Multiple mounting holes (15) are also provided on the lamination body (11) evenly distributed around the circumference.

7. A permanent magnet motor rotor core, characterized in that: It includes multiple stacked rotor laminations (1), wherein the rotor laminations (1) are permanent magnet motor rotor laminations (1) as described in any one of claims 1 to 6.

8. A permanent magnet motor rotor, characterized in that: The rotor core is the permanent magnet motor rotor core as described in claim 7. The permanent magnet motor rotor also includes a permanent magnet (2) disposed in the permanent magnet slot (13) and a rotating shaft (3) in the central shaft hole (12). There is a magnetic isolation gap between the radial inner end of the permanent magnet (2) and the rotating shaft (3). The rotating shaft (3) is a non-magnetic rotating shaft (3).

9. The permanent magnet motor rotor according to claim 8, characterized in that: The minimum size of the magnetic isolation gap between the radial inner end of the permanent magnet (2) and the rotating shaft (3) is 0-0.4 mm.

10. A permanent magnet motor, characterized in that: It includes a stator and a rotor. The stator includes a stator core, and the stator core includes stator laminations (4). The stator laminations (4) have multiple stator slots evenly distributed around the circumference. The inner ends of the stator slots are open. The rotor is the permanent magnet motor rotor as described in claim 8 or 9.

Images