Motor Rotor and Self-Starting Synchronous Reluctance Motor

Abstract

The present application provides a motor rotor and a self-starting synchronous reluctance motor. The motor rotor includes a rotor core (1), and a filling groove and a slit groove (2) are provided on the rotor core (1). The filling groove is provided on the outer peripheral side of the rotor core (1), and the slit groove (2) penetrates through the central region of the rotor core (1). According to the motor rotor of the present application, the utilization space of the rotor can be increased, the saturation of the rotor magnetic circuit can be reduced, the number of rotor salient poles can be increased, and the motor efficiency can be further improved.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and particularly to a motor rotor and a self-starting synchronous reluctance motor. Background Art

[0002] Based on the synchronous reluctance motor, the self-starting synchronous reluctance motor combines the advantages of the asynchronous motor and realizes self-starting through the asynchronous torque generated by the rotor bars, without the need to use an inverter for driving. Compared with the asynchronous motor, the motor can achieve constant-speed operation, with low rotor loss and improved efficiency during synchronous operation; compared with the asynchronous starting permanent magnet synchronous motor, the motor does not use permanent magnet materials, has low cost, and there is no problem of permanent magnet demagnetization. However, due to the coexistence of the multi-layer magnetic barrier layer structure and the shaft hole in the self-starting synchronous reluctance motor, the utilization space of the rotor is small, and the problem of rotor magnetic circuit saturation is likely to occur. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present application is to provide a motor rotor and a self-starting synchronous reluctance motor, which can increase the utilization space of the rotor, reduce the saturation of the rotor magnetic circuit, increase the number of rotor salient poles, and further improve the motor efficiency.

[0004] To solve the above problems, the present application provides a motor rotor, including a rotor core, on which a filling groove and a slit groove are provided. The filling groove is arranged on the outer peripheral side of the rotor core, and the slit groove penetrates through the central region of the rotor core.

[0005] Preferably, at least part of the slit groove in the central region of the rotor core is filled with a non-magnetic material. Rotor short shafts are provided at both ends of the rotor core, and the rotor short shafts are fixedly connected to the rotor core through the non-magnetic material in the central region of the rotor core. The central region is the region where the rotor short shaft contacts the end face of the rotor core.

[0006] Preferably, the slit groove in the central region is filled with the non-magnetic material.

[0007] Preferably, a plate-shaped or column-shaped non-magnetic material is respectively arranged in each slit groove in the central region. When the non-magnetic material is column-shaped, it is distributed in a circular shape.

[0008] Preferably, the non-magnetic material extends out of the end face of the rotor core. A groove is provided on the rotor short shaft, and the part of the non-magnetic material extending out of the rotor core is inserted into the groove.

[0009] Preferably, the non-magnetic material is fixedly connected to the end face of the rotor short shaft at one end, the non-magnetic material is inserted into the slit groove of the rotor core, passes through the other end of the rotor core, and is inserted and fixed with the rotor short shaft located at the other end of the rotor core.

[0010] Preferably, the non-magnetic material filled in the slit groove in the central region is symmetric about the d-axis and the q-axis.

[0011] Preferably, the proportion of the total area of the filling grooves in the sum of the areas of the filling grooves and the slit grooves is 30% to 70%.

[0012] Preferably, the proportion of the total area of the filling grooves in the sum of the areas of the filling grooves and the slit grooves is 35% to 50%.

[0013] Preferably, the filling grooves include non-independent filling grooves arranged on the same layer as the slit grooves and independent filling grooves located outside the slit grooves along the q-axis direction. The independent filling grooves on the same layer are arranged as a whole or in blocks.

[0014] Preferably, when the independent filling grooves are arranged in blocks, the interval width L1 between adjacent blocks satisfies 0.8σ ≤ L1 ≤ 2σ, where σ is the width of the air gap between the stator and the rotor.

[0015] Preferably, the included angle α1 between the center connection line of the two ends of the independent filling groove and the rotor center satisfies 20° ≤ α1 ≤ 60°.

[0016] Preferably, the width L2 of the non-independent filling groove along the q-axis direction satisfies 0.7L3 ≤ L2 ≤ 1.5L3, where L3 is the width of the slit groove on the same layer as the non-independent filling groove along the q-axis direction.

[0017] Preferably, the width L2 of the non-independent filling groove along the q-axis direction satisfies 0.9L3 ≤ L2 ≤ 1.1L3.

[0018] Preferably, the minimum width of the magnetic conduction channel between two adjacent non-independent filling grooves is d1, and the minimum width of the magnetic conduction channel between the slit grooves corresponding to the two non-independent filling grooves is d2, 0.7d2 ≤ d1 ≤

[0019] 1.5d2.

[0020] Preferably, 0.9d2 ≤ d1 ≤ 1.1d2.

[0021] Preferably, the slit groove includes an arc segment and / or a straight segment.

[0022] Preferably, the non-independent filling grooves and the slit grooves on the same layer form a magnetic barrier layer, the independent filling grooves on the same layer form a magnetic barrier layer, the magnetic barrier layers under one pole are symmetrically arranged about the q-axis, and at least two layers are arranged radially.

[0023] Preferably, the interval width L4 between the non-independent filling grooves and the slit grooves on the same layer satisfies 0.8σ ≤ L4 ≤ 2σ, where σ is the width of the air gap between the stator and the rotor.

[0024] Preferably, the minimum distance between adjacent magnetic barrier layers is L5, and the minimum width in the q-axis direction of the magnetic barrier layer with a smaller thickness in the q-axis direction among the adjacent magnetic barrier layers is L6, where L5 ≥ 1.5L6.

[0025] Preferably, the minimum distance L7 between the magnetic barrier layer and the outer circumference of the rotor satisfies 0 ≤ L7 ≤ 2.5σ, where σ is the width of the air gap between the stator and the rotor.

[0026] Preferably, at least part of the filling slots are filled with a conductive and non-magnetic material, and short-circuiting is achieved through end rings at both ends of the rotor core to form a squirrel cage.

[0027] According to another aspect of the present application, a self-starting synchronous reluctance motor is provided, including a motor rotor, and the motor rotor is the above-mentioned motor rotor.

[0028] The motor rotor provided by the present application includes a rotor core, and filling slots and slit slots are arranged on the rotor core. The filling slots are arranged on the outer peripheral side of the rotor core, and the slit slots penetrate through the central area of the rotor core. The motor rotor does not have a rotor shaft hole on the rotor core, so that the available space of the rotor core is increased, and the slit slots can replace the original rotor shaft hole position, so that the number and area of the slit slots can be greatly increased. On the one hand, the uniformity and non-saturation of the rotor magnetic flux density distribution can be ensured, and on the other hand, the rotor salient pole ratio can be increased, the motor reluctance torque can be improved, and the motor efficiency can be improved. Description of the Drawings

[0029] Figure 1 is a schematic structural diagram of a motor rotor according to an embodiment of the present application;

[0030] Figure 2 is a schematic structural diagram of a motor rotor according to an embodiment of the present application;

[0031] Figure 3 is an exploded structural diagram of a motor rotor according to an embodiment of the present application;

[0032] Figure 4 is a three-dimensional structural diagram of the rotor short shaft of a motor rotor according to an embodiment of the present application;

[0033] Figure 5 is an exploded structural diagram of a motor rotor according to an embodiment of the present application;

[0034] Figure 6 is a perspective structural diagram of the rotor short shaft of a motor rotor according to an embodiment of the present application;

[0035] Figure 7 is a three-dimensional structural diagram of the rotor short shaft of a motor rotor according to an embodiment of the present application;

[0036] Figure 8Efficiency comparison diagram of a motor using the motor rotor of the embodiment of the present application and a motor in the related art.

[0037] The reference signs are indicated as:

[0038] 1. Rotor core; 2. Slit groove; 3. Non-independent filling groove; 4. Independent filling groove; 5. Magnetic conduction channel; 6. Non-magnetic material; 7. Rotor short shaft. Specific embodiments

[0039] Refer to Figures 1 to 8 As shown, according to the embodiment of the present application, the motor rotor includes a rotor core 1, and a filling groove and a slit groove 2 are provided on the rotor core 1. The filling groove is provided on the outer peripheral side of the rotor core 1, and the slit groove 2 penetrates the central region of the rotor core 1.

[0040] The motor rotor does not have a rotor shaft hole on the rotor core 1, so that the available space of the rotor core 1 is increased. The slit groove 2 can replace the original rotor shaft hole position, so that the number and area of the slit groove 2 can be greatly increased. On the one hand, it can ensure the uniformity and non-saturation of the rotor magnetic density distribution. On the other hand, it can increase the rotor salient pole ratio, improve the motor reluctance torque, and improve the motor efficiency.

[0041] In one embodiment, at least part of the slit groove 2 in the central region of the rotor core 1 is filled with a non-magnetic material 6. Rotor short shafts 7 are provided at both ends of the rotor core 1. The rotor short shafts 7 are fixedly connected to the rotor core 1 through the non-magnetic material 6 in the central region of the rotor core 1. The central region is the region where the rotor short shafts 7 are in contact with the end face of the rotor core 1. In this embodiment, the central region corresponds to the central shaft hole region of the motor rotor in the prior art. Since the rotor shaft hole is removed, the region where the rotor shaft hole was originally provided becomes a solid structure. A slit groove 2 can be provided in the central region where the rotor shaft hole was originally provided, so that the space where the slit groove 2 can be provided on the rotor core 1 is increased, the available space of the rotor core 1 is more effectively increased, the rotor salient pole ratio is increased, the motor reluctance torque is improved, and the motor efficiency is improved.

[0042] The above non-magnetic material 6 is preferably a material that is non-conductive and non-magnetic, such as fiberglass, carbon fiber or ceramic layer.

[0043] Since the motor rotor cancels the rotor shaft hole, it is necessary to re-consider the connection between the rotating shaft and the rotor core 1. In this embodiment, after removing the rotor shaft hole, by setting a non-magnetic material 6 in the slit groove 2 in the central region as the shaft end output, and the non-magnetic material 6 filled in the slit groove 2 in the central region as the shaft end output is symmetric about the d-axis and the q-axis, the connection and cooperation with the rotor short shafts 7 can be realized, so as to replace the original cooperation structure between the rotor shaft hole and the rotating shaft, prevent eccentricity during the operation of the rotor, and ensure the normal output of the motor torque.

[0044] In one embodiment, the non-magnetic material 6 fills the slit groove 2 in the central region, such that the non-magnetic material 6 presents a rectangular plate-like structure, and a stable and reliable connection can be achieved between the non-magnetic material 6 and the rotor short shafts 7 at both ends of the rotor core 1.

[0045] In one embodiment, non-magnetic materials 6 in the form of plates or columns are respectively arranged in the slit grooves 2 in the central region. When the non-magnetic materials 6 are in columnar form, they are circularly distributed, and a stable and reliable connection can be achieved between the columnar non-magnetic materials 6 and the rotor short shafts 7 at both ends of the rotor core 1.

[0046] In one embodiment, the non-magnetic material 6 extends out of the end face of the rotor core 1, and a groove is provided on the rotor short shaft 7. The part of the non-magnetic material 6 extending out of the rotor core 1 is inserted into the groove. In this embodiment, the non-magnetic material 6 fills or is inserted into the slit groove 2 in the central region, and the axial length of the non-magnetic material 6 in the central region is greater than the axial length of the rotor core 1, so that it can extend out of the rotor core 1 from both axial ends or one end, and is inserted and matched with the groove of the rotor short shaft 7 outside the rotor core 1, thereby realizing the rotational cooperation between the rotor core 1 and the rotor short shaft 7.

[0047] The groove structure on the rotor short shaft 7 is adapted to the shape of the non-magnetic material 6 located in the slit groove 2 in the central region. For example, when the non-magnetic material 6 in the slit groove 2 in the central region is in plate-like structure, the groove on the rotor short shaft 7 is also a rectangular groove matching the plate-like structure; when the non-magnetic material 6 in the slit groove 2 in the central region is in columnar structure, the groove on the rotor short shaft 7 is also a columnar groove matching the columnar structure.

[0048] In one embodiment, the non-magnetic material 6 is fixedly connected to the end face of the rotor short shaft 7 at one end. The non-magnetic material 6 is inserted into the slit groove 2 of the rotor core 1 and passes through the other end of the rotor core 1, and is inserted and fixed to the rotor short shaft 7 located at the other end of the rotor core 1.

[0049] In one embodiment, the total area of the filling grooves accounts for 30% - 70% of the sum of the areas of the filling grooves and the slit grooves 2.

[0050] Preferably, the total area of the filling grooves accounts for 35% - 50% of the sum of the areas of the filling grooves and the slit grooves 2, so as to ensure a certain proportion of the filling groove area and enable the motor to have a certain load starting capacity.

[0051] In one embodiment, the filling grooves include non-independent filling grooves 3 arranged on the same layer as the slit grooves 2 and independent filling grooves 4 located outside the slit grooves 2 along the q-axis direction. The independent filling grooves 4 on the same layer are arranged as a whole or in blocks.

[0052] In one embodiment, when the independent filling slots 4 are arranged in a segmented manner, the interval width L1 between adjacent segments satisfies 0.8σ ≤ L1 ≤ 2σ, where σ is the width of the air gap between the stator and the rotor. Such a setting can ensure the mechanical strength of the rotor part structure and reduce the pressure deformation of the independent filling slots 4.

[0053] In one embodiment, the included angle α1 between the two ends of the independent filling slot 4 and the connecting line of the rotor center satisfies 20° ≤ α1 ≤ 60°. With such a setting, the independent filling slot 4 can be used as a magnetic barrier layer to increase the reluctance torque of the motor and can also be used as a starting squirrel cage to improve the starting performance of the motor.

[0054] In one embodiment, the width L2 of the non-independent filling slot 3 in the q-axis direction satisfies 0.7L3 ≤ L2 ≤ 1.5L3, where L3 is the width of the slit slot 2 in the q-axis direction on the same layer as the non-independent filling slot 3.

[0055] Preferably, the width L2 of the non-independent filling slot 3 in the q-axis direction satisfies 0.9L3 ≤ L2 ≤ 1.1L3. Such a setting will not cause the magnetic conduction channel 5 between the slit slots 2 to be overloaded, resulting in a reduction in the motor output and a decrease in the motor efficiency.

[0056] In one embodiment, the minimum width of the magnetic conduction channel 5 between two adjacent non-independent filling slots 3 is d1, and the minimum width of the magnetic conduction channel 5 between the slit slots 2 corresponding to the two non-independent filling slots 3 is d2, where 0.7d2 ≤ d1 ≤ 1.5d2.

[0057] Preferably, 0.9d2 ≤ d1 ≤ 1.1d2. The purpose of such a setting is to ensure that there is enough width between the filling slots to avoid magnetic field saturation and affect the magnetic flux circulation in the channels between the magnetic barrier layers.

[0058] In one embodiment, the slit slot 2 includes an arc segment and / or a straight segment. The two end portions of the slit slot 2 generally extend along the d-axis direction.

[0059] In one embodiment, the non-independent filling slots 3 and the slit slots 2 on the same layer form a magnetic barrier layer, the independent filling slots 4 on the same layer form a magnetic barrier layer, the magnetic barrier layers under one pole are symmetrically arranged about the q-axis, and at least two layers are arranged in the radial direction.

[0060] In one embodiment, the interval width L4 between the non-independent filling slot 3 and the slit slot 2 on the same layer satisfies 0.8σ ≤ L4 ≤ 2σ, where σ is the width of the air gap between the stator and the rotor. Such a setting can ensure the mechanical strength of the rotor part structure and reduce the magnetic leakage between the filling slot and the slit slot 2.

[0061] In one embodiment, the minimum distance between adjacent magnetic barrier layers is L5, and the minimum width in the q-axis direction of the magnetic barrier layer with a smaller thickness in the q-axis direction among the adjacent magnetic barrier layers is L6, where L5 ≥ 1.5L6. Such a setting can reduce the rotor processing difficulty and ensure the uniformity and non-saturation of the rotor magnetic flux density distribution.

[0062] In one embodiment, the minimum distance L7 between the magnetic barrier layer and the outer circle of the rotor satisfies 0 ≤ L7 ≤ 2.5σ, where σ is the width of the air gap between the stator and the rotor. With such a setting, under the condition of ensuring the mechanical strength of the rotor, the magnetic leakage of the motor can be reduced and the motor efficiency can be improved.

[0063] In one embodiment, at least part of the filling slots are filled with a conductive and non-magnetic material, and short-circuiting is achieved through end rings at both ends of the rotor core 1 to form a squirrel cage. The filling slots of the independent filling slots 4 and the non-independent filling slots 3 are both filled with a conductive and non-magnetic material, preferably aluminum or aluminum alloy, and can also be copper or other materials. The filling slots are self-short-circuited and connected through end rings at both ends of the rotor to form a squirrel cage structure, and the material of the end rings is the same as the filling material in the filling slots. The self-short-circuiting squirrel cage structure provides an asynchronous torque during the motor starting stage to achieve the self-starting of the motor; the multi-layer magnetic barrier layer structure provides a reluctance torque for the motor to achieve the synchronous operation of the motor.

[0064] Referring to Figure 8 As shown, it is a comparison of the efficiency effects of the motor using the motor rotor of the embodiment of the present application and the motor of the related technology at different torques. It can be clearly seen from the figure that the motor using the motor rotor of the embodiment of the present application can increase the rotor salient pole ratio, thereby improving the motor efficiency.

[0065] According to the embodiment of the present application, the self-starting synchronous reluctance motor includes a motor rotor, and the motor rotor is the above-mentioned motor rotor.

[0066] It is easy for those skilled in the art to understand that, on the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0067] The above are only the preferred embodiments of the present application, and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above is only the preferred implementation manner of the present application. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present application, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present application.

Claims

1. A motor rotor, characterized in that, It includes a rotor core (1), and a filling groove and a slit groove (2) are provided on the rotor core (1). The filling groove is arranged on the outer peripheral side of the rotor core (1), and the slit groove (2) penetrates through the central region of the rotor core (1). At least part of the slit groove (2) located in the central region of the rotor core (1) is filled with a non-magnetic material (6). Rotor short shafts (7) are provided at both ends of the rotor core (1). The rotor short shafts (7) are fixedly connected to the rotor core (1) through the non-magnetic material (6) in the central region of the rotor core (1). The central region is the region where the rotor short shafts (7) contact the end faces of the rotor core (1). The slit groove (2) includes an arc segment and / or a straight segment.

2. The motor rotor according to claim 1, wherein The non-magnetic material (6) fills the slit groove (2) in the central region completely.

3. The motor rotor according to claim 1, characterized in that, In each of the slit grooves (2) in the central region, a non-magnetic material (6) in the shape of a plate or a column is provided. When the non-magnetic material (6) is in the shape of a column, it is distributed in a circular pattern.

4. The motor rotor according to claim 1, characterized in that The non-magnetic material (6) extends out of the end face of the rotor core (1). A groove is provided on the rotor short shaft (7). The part of the non-magnetic material (6) that extends out of the rotor core (1) is inserted into the groove.

5. The motor rotor according to claim 1, characterized in that, The non-magnetic material (6) is fixedly connected to the end face of the rotor short shaft (7) at one end. The non-magnetic material (6) is inserted into the slit groove (2) of the rotor core (1) and passes through the other end of the rotor core (1), and is inserted and fixed with the rotor short shaft (7) located at the other end of the rotor core (1).

6. The motor rotor according to claim 1, wherein The non-magnetic material (6) filled in the slit groove (2) in the central region is symmetric about the d-axis and the q-axis.

7. The motor rotor according to claim 1, wherein, The proportion of the total area of the filling groove in the sum of the areas of the filling groove and the slit groove (2) is 30% - 70%.

8. The motor rotor according to claim 7, characterized in that, The proportion of the total area of the filling groove in the sum of the areas of the filling groove and the slit groove (2) is 35% - 50%.

9. The motor rotor according to claim 1, characterized in that, The filling groove includes a non-independent filling groove (3) arranged on the same layer as the slit groove (2) and an independent filling groove (4) located outside the slit groove (2) along the q-axis direction. The independent filling grooves (4) on the same layer are arranged as a whole or in blocks.

10. The motor rotor according to claim 9, characterized in that, When the independent filling groove (4) is arranged in blocks, the interval width L1 between adjacent blocks satisfies 0.8σ ≤ L1 ≤ 2σ, where σ is the width of the air gap between the stator and the rotor.

11. The motor rotor according to claim 9, characterized in that, The included angle α1 between the connection line of the two ends of the independent filling groove (4) and the rotor center satisfies 20° ≤ α1 ≤ 60°.

12. The motor rotor according to claim 9, characterized in that, The width L2 of the non-independent filling groove (3) along the q-axis direction satisfies 0.7L3 ≤ L2 ≤ 1.5L3, where L3 is the width of the slit groove (2) on the same layer as the non-independent filling groove (3) along the q-axis direction.

13. The motor rotor according to claim 12, characterized in that, The width L2 of the non-independent filling groove (3) along the q-axis direction satisfies 0.9L3 ≤ L2 ≤ 1.1L3.

14. The motor rotor according to claim 9, characterized in that, The minimum width of the magnetic conduction channel (5) between two adjacent non-independent filling slots (3) is d1, and the minimum width of the magnetic conduction channel (5) between the slit slots (2) corresponding to the two non-independent filling slots (3) is d2, where 0.7d2 ≤ d1 ≤ 1.5d2.

15. The motor rotor according to claim 14, characterized in that, 0.9d2 ≤ d1 ≤ 1.1d2.

16. The motor rotor according to claim 9, wherein, The non-independent filling slots (3) and the slit slots (2) on the same layer form a magnetic barrier layer, and the independent filling slots (4) on the same layer form a magnetic barrier layer. The magnetic barrier layers under one pole are arranged symmetrically about the q-axis and at least two layers are arranged radially.

17. The motor rotor according to claim 9, characterized in that, The spacing width L4 between the non-independent filling slots (3) and the slit slots (2) on the same layer satisfies 0.8σ ≤ L4 ≤ 2σ, where σ is the width of the air gap between the stator and the rotor.

18. The motor rotor according to claim 16, characterized in that, The minimum distance between adjacent magnetic barrier layers is L5, and the minimum width in the q-axis direction of the magnetic barrier layer with a smaller thickness in the q-axis direction among the adjacent magnetic barrier layers is L6, where L5 ≥ 1.5L6.

19. The motor rotor according to claim 16, wherein, The minimum distance L7 between the magnetic barrier layer and the outer circle of the rotor satisfies 0 ≤ L7 ≤ 2.5σ, where σ is the width of the air gap between the stator and the rotor.

20. The motor rotor according to claim 1, characterized in that, At least part of the filling slots are filled with a conductive and non-magnetic material, and short-circuiting is achieved through the end rings at both ends of the rotor core (1) to form a squirrel cage.

21. A self-starting synchronous reluctance motor, comprising a motor rotor, characterized in that, The motor rotor is the motor rotor according to any one of claims 1 to 20.

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