A rotor structure, a motor and an electrical appliance comprising the rotor structure

Abstract

The present invention discloses a rotor structure, a motor and an electrical appliance including the rotor structure, and relates to the technical field of motors. The rotor structure includes a rotor core, the rotor core is provided with a plurality of magnetic steel slots penetrating the rotor core in the axial direction, the plurality of magnetic steel slots are arranged in a ring shape, the end of the rotor core includes a first region corresponding to the magnetic steel slots and located outside the magnetic steel slots, a second region corresponding to the q-axis and located on the q-axis, and at least one of the first regions at the end of the rotor core is partially or entirely lower than the second region adjacent to the first region. With such an arrangement, while reducing the cost of magnetic steel, the magnetic resistance difference between the d-axis and the q-axis of the rotor structure is increased, thereby increasing the magnetic resistance torque, reducing the copper loss of the motor, and improving the efficiency of the motor.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and more specifically, to a rotor structure, a motor and an electrical appliance comprising the rotor structure. Background Art

[0002] As the country continues to advocate the path of green development, in order to achieve the transformation to an industrial power and green development, industrial energy conservation, especially motor energy conservation, is crucial in the context of the current tightening of energy and environmental policies.

[0003] In the prior art, many companies have made improvements to the rotor structure of the motor to achieve the purpose of improving the energy efficiency of the motor. For the inserted magnet rotor, by increasing the amount of magnet used, more magnets are inserted into the magnet slots to increase the magnetic resistance difference between the d-axis and q-axis of the rotor, thereby increasing the magnetic resistance torque, reducing the copper loss of the motor, and improving the energy efficiency of the motor. The direction perpendicular to the rotor magnet is the d-axis of the rotor, and the direction without magnets is the q-axis of the rotor. However, the cost of magnets is high, which does not conform to the modern cost management concept.

[0004] Therefore, how to achieve a higher magnetic resistance difference between the d-axis and the q-axis while reducing the cost of the motor has become an important technical problem that technicians in this field need to solve. Summary of the invention

[0005] The object of the present invention is to provide a rotor structure, a motor and an electrical appliance including the rotor structure, so as to solve the problem that the reluctance difference between the d-axis and the q-axis is increased by increasing the amount of magnetic steel used in the prior art, resulting in a high cost of the motor. The various technical effects that can be produced by the preferred technical solution among the various technical solutions provided by the present invention are described in detail below.

[0006] The present invention provides a rotor structure, including a rotor core, wherein the rotor core is provided with a plurality of magnetic steel slots penetrating the rotor core in an axial direction, wherein the plurality of magnetic steel slots are arranged in a ring shape, and an end portion of the rotor core includes a first region corresponding one-to-one to the magnetic steel slots and located outside the magnetic steel slots, and a second region corresponding one-to-one to the q-axis and located on the q-axis, and at least one of the first regions at the end portion of the rotor core is partially or entirely lower than the second region adjacent to the first region.

[0007] Preferably, the height of each magnetic steel respectively inserted into each magnetic steel slot is not higher than the height of the corresponding first area.

[0008] Preferably, each of the first regions at the end of the rotor core is partially or entirely lower than the second region adjacent thereto.

[0009] Preferably, at both ends of the rotor core, there is at least one first region whose part or whole is lower than the second region adjacent to the first region.

[0010] Preferably, each of the first regions at both ends of the rotor core is partially or entirely lower than the second region adjacent thereto.

[0011] Preferably, the first region includes magnetic isolation bridges corresponding to two sides of the same magnetic steel, and a spacing portion located between the two magnetic isolation bridges.

[0012] Preferably, the d-axis of the rotor structure passes through the first region.

[0013] Preferably, the rotor core is formed by stacking a plurality of laminations.

[0014] Preferably, the laminate includes a first laminate and a second laminate, the second laminate lacks the first region relative to the first laminate, and the second laminate is laminated on both ends of a portion laminated by the first laminate.

[0015] The present invention also provides a motor, comprising a rotor structure, wherein the rotor structure is the above-mentioned rotor structure.

[0016] The present invention further provides an electrical appliance, comprising a motor, wherein the motor is the motor described above.

[0017] In the technical solution provided by the present invention, the rotor structure includes a rotor core, the rotor core is provided with a plurality of magnetic steel slots, each magnetic steel slot penetrates the rotor core along the axial direction of the rotor core, and the plurality of magnetic steel slots are arranged in a ring shape, the end of the rotor core includes a first region and a second region, wherein the first region is a region corresponding to the magnetic steel slot one by one and located outside the magnetic steel slot, and the second region is a region corresponding to the q-axis one by one and located on the q-axis, and at the end of the rotor core, at least one first region is partially or entirely lower than the second region adjacent to the first region. In this arrangement, there is no magnetic barrier on the q-axis magnetic circuit, and the magnetic lines of force can pass smoothly, thereby obtaining a larger q-axis inductance, and for the position of the first region lower than the second region, the magnetic permeability of the permanent magnet on the magnetic circuit is close to the magnetic permeability of the air gap, which hinders the passage of the magnetic lines of force, obtains a smaller inductance, increases the magnetic resistance difference between the d-axis and the q-axis, thereby providing a larger magnetic resistance torque, and the increase of the magnetic resistance torque will reduce the current, thereby reducing the copper loss of the motor and improving the efficiency of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 is a schematic diagram of a rotor structure in an embodiment of the present invention;

[0020] Figure 2 is an exploded view of the rotor structure in an embodiment of the present invention;

[0021] Figure 3 is a schematic structural diagram of a first laminate in an embodiment of the present invention;

[0022] Figure 4 Schematic diagram of the structure of the second laminate in an embodiment of the present invention.

[0023] Figure 1-Figure 4 middle:

[0024] 1-magnetic steel slot, 2-first region, 21-magnetic isolation bridge, 22-spacer, 3-second region, 4-first laminate, 5-second laminate. DETAILED DESCRIPTION

[0025] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0026] The purpose of this specific embodiment is to provide a rotor structure, which can achieve a higher magnetic resistance difference between the d-axis and the q-axis while reducing the magnetic steel cost of the motor, thereby improving the energy efficiency of the motor.

[0027] The following is an explanation of the embodiments with reference to the accompanying drawings. In addition, the embodiments shown below do not limit the invention described in the claims. In addition, the entire contents of the configurations shown in the following embodiments are not limited to the solutions required as the invention described in the claims.

[0028] Please refer to Figure 1-Figure 2In this embodiment, the rotor structure includes a rotor core, and the rotor core is provided with a plurality of magnetic steel slots 1, each of which penetrates the rotor core along the axial direction of the rotor core, and the plurality of magnetic steel slots 1 are arranged in a ring shape; at the end of the rotor core, the area corresponding to the magnetic steel slots 1 one by one and located outside the magnetic steel slots 1 is the first area 2, and the area corresponding to the q-axis one by one and located on the q-axis is the second area 3, and at least one first area 2 at the end of the rotor core is partially or entirely lower than the second area 3 adjacent to the first area 2.

[0029] With such arrangement, there is no magnetic barrier on the q-axis magnetic circuit of the rotor core, and the magnetic lines of force can pass through smoothly, resulting in a larger q-axis inductance. For the position of the first region 2 below the second region 3, the magnetic permeability of the permanent magnets on the magnetic circuit is close to the magnetic permeability of the air gap, which hinders the passage of the magnetic lines of force and results in a smaller inductance. This increases the reluctance difference between the d-axis and the q-axis, thereby providing a larger reluctance torque. When the reluctance torque increases, the current decreases, thereby reducing the copper loss of the motor and improving the efficiency of the motor. A higher reluctance difference between the d-axis and the q-axis is achieved with a smaller amount of magnetic steel used, that is, with a lower cost of the motor.

[0030] In a preferred solution of this embodiment, a magnetic steel is inserted into each magnetic steel slot 1 , and the height of each magnetic steel inserted into each magnetic steel slot 1 is not higher than the height of the first area 2 corresponding thereto.

[0031] With such an arrangement, crushing of the magnetic steel can be avoided when assembling the motor, and less magnetic steel is used, which can reduce the cost of the motor.

[0032] As a preferred embodiment of the present invention, each first region 2 at the end of the rotor core is partially or entirely lower than the second region 3 adjacent thereto. In this arrangement, the first region 2 is lower than the second region 3, which hinders the passage of magnetic lines of force, resulting in a smaller d-axis inductance, and the magnetic lines of force in the q-axis direction can pass smoothly, resulting in a larger q-axis inductance. At the end of the rotor core, the first region 2 is lower than the second region 3 for a larger portion, so that the magnetic resistance difference between the d-axis and the q-axis is higher, the magnetic resistance torque is larger, and the energy efficiency of the motor is higher.

[0033] Preferably, in this embodiment, at least one first region 2 is partially or entirely lower than a second region 3 adjacent to the first region 2 at both ends of the rotor core. With such an arrangement, both ends of the rotor core have structures that increase the magnetic resistance difference between the d-axis and the q-axis. For the entire rotor structure, the magnetic resistance difference between the d-axis and the q-axis is larger, so that the magnetic resistance torque of the rotor is larger. The increase in magnetic resistance torque is beneficial to reducing copper loss, thereby achieving the purpose of improving the energy efficiency of the motor.

[0034] In the preferred solution of this embodiment, each first region 2 at both ends of the rotor core is partially or entirely lower than the second region 3 adjacent thereto. With such a configuration, the magnetic resistance difference between the d-axis and the q-axis of the rotor is larger, so that the magnetic resistance torque of the rotor is larger. The increase in magnetic resistance torque is conducive to reducing copper loss, thereby achieving the purpose of improving the energy efficiency of the motor. Preferably, each first region 2 at both ends of the rotor core is entirely lower than the second region 3 adjacent thereto. At this time, the magnetic resistance difference between the d-axis and the q-axis of the rotor reaches the maximum, which can maximize the magnetic resistance torque of the rotor and improve the energy efficiency of the motor.

[0035] In this embodiment, please refer to Figure 1-Figure 3 , the first region 2 includes magnetic isolation bridges 21 corresponding to the two sides of the same magnetic steel, and a spacing portion 22 located between the two magnetic isolation bridges 21. In some embodiments, at least one first region 2 at the end of the rotor core is partially or entirely lower than the second region 3 adjacent thereto. Of course, in a preferred embodiment, each of the first regions 2 at both ends of the rotor core is overall lower than the second region 3 adjacent thereto, that is, the magnetic isolation bridges 21 and the spacing portions 22 of each first region 2 are lower than the second region 3 adjacent thereto.

[0036] Such an arrangement reduces the height of the magnetic isolation bridge 21, thereby reducing the leakage flux of the magnetic isolation bridge 21. More magnetic flux passes through the rotor core to reach the air gap between the stator and the rotor and then reaches the teeth of the stator to form a loop, thereby increasing the amplitude of the air gap magnetic field strength, thereby obtaining a greater electromagnetic torque, reducing the copper loss of the motor, and achieving the purpose of improving the energy efficiency of the motor. At the same time, the reduction of the leakage flux of the magnetic isolation bridge 21 can reduce the back electromotive force distortion rate, reduce speed fluctuations, reduce the noise of the motor, make the motor run more smoothly, and improve the performance of the motor.

[0037] It should be noted that, in this embodiment, the d-axis of the rotor structure passes through the first region 2, and part or all of the first region 2 at the end of the rotor core is lower than the adjacent second region 3, thereby increasing the magnetic resistance difference between the d-axis and the q-axis, thereby achieving the purpose of improving the energy efficiency of the motor. In the preferred scheme of this embodiment, at the end of the rotor core, the inner region of the ring surrounded by each magnetic steel slot 1 is consistent with the height of the q-axis, and such a configuration facilitates the production and processing of the rotor structure.

[0038] In this embodiment, please refer to Figure 3-Figure 4The rotor core is formed by stacking a plurality of laminations, the laminations include a first lamination 4 and a second lamination 5, the second lamination 5 lacks the first region 2 relative to the first lamination 4, when manufacturing the rotor core, firstly, a plurality of first laminations 4 are stacked together, and then the second lamination 5 is stacked on both ends of the portion stacked by the first laminations 4, so that the first regions 2 at both ends of the formed rotor structure are lower than the second region 3 as a whole. The first lamination 4 and the second lamination 5 are both obtained by high-pressure stamping, and the second lamination 5 is fixed to the portion stacked by the first lamination 4 by buckling points.

[0039] The following content specifically describes the present rotor structure in combination with the above-mentioned embodiments. In this embodiment, the rotor structure includes a rotor core, and the rotor core is provided with a plurality of magnetic steel slots 1 penetrating the rotor core in the axial direction. The plurality of magnetic steel slots 1 are arranged in a ring shape. Both ends of the rotor core include a first region 2 corresponding to the magnetic steel slots 1 and located outside the magnetic steel slots 1, and a second region 3 corresponding to the q-axis and located on the q-axis. The first regions 2 at at least one end of the rotor core are lower than the second regions 3 adjacent to the first regions 2 as a whole, and the height of each magnetic steel inserted in each magnetic steel slot 1 is not higher than the height of the corresponding first region 2. The first region 2 includes magnetic isolation bridges 21 corresponding to the two sides of the same magnetic steel, and a spacer 22 located between the two magnetic isolation bridges 21. The magnetic isolation bridges 21 and the spacer 22 of each first region 2 at at least one end of the rotor core are lower than the adjacent second region 3. The d-axis of the rotor structure passes through the first region 2.

[0040] The rotor core is formed by stacking a plurality of laminations, including a first lamination 4 and a second lamination 5, wherein the second lamination 5 lacks the first region 2 on the basis of the first lamination 4. When manufacturing the rotor core, the plurality of first laminations 4 are first stacked together, and then the plurality of second laminations 5 are stacked on both ends of the portion stacked by the first laminations 4.

[0041] With such arrangement, the magnetic lines of force on the q-axis magnetic circuit can pass through the rotor smoothly, while the portion of the first region 2 that is lower than the adjacent second region 3 hinders the passage of the magnetic lines of force. Therefore, the magnetic resistance difference between the d-axis and the q-axis is increased, thereby increasing the magnetic resistance torque of the rotor, which is beneficial to reducing copper loss and improving the energy efficiency of the motor. At the same time, the height of the magnetic isolation bridge 21 is reduced, which reduces the leakage magnetic flux at the position of the magnetic isolation bridge 21, thereby improving the efficiency of the motor and reducing the vibration noise of the motor.

[0042] The present invention also provides a motor, including a rotor structure, which is the rotor structure in the above embodiment. With such a configuration, the magnetic resistance difference between the d-axis and the q-axis of the rotor of the motor increases, which can improve the energy efficiency of the motor while reducing the cost of the magnetic steel. At the same time, the leakage flux of the magnetic isolation bridge 21 is reduced, and the vibration and noise problems of the motor are improved. The derivation process of this beneficial effect is generally similar to the derivation process of the beneficial effect brought about by the rotor structure, so it will not be repeated in this article.

[0043] The present invention further provides an electrical appliance, comprising a motor, which is the motor in the above embodiment. The electrical appliance may be, but is not limited to, an air conditioner or a refrigerator. With such a configuration, the energy efficiency of the motor is improved while the cost of the magnetic steel is reduced, so that the energy efficiency of the electrical appliance is also improved, and at the same time, the vibration and noise problems of the electrical appliance are improved. The derivation process of this beneficial effect is generally similar to the derivation process of the beneficial effects brought about by the above rotor structure and the motor, so it will not be repeated herein.

[0044] It is understood that the same or similar parts in the above embodiments can refer to each other, and the content not described in detail in some embodiments can refer to the same or similar content in other embodiments. The multiple solutions provided by the present invention include the basic solution itself, which are independent of each other and do not restrict each other, but they can also be combined with each other without conflict to achieve multiple effects together.

[0045] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A rotor structure, comprising a rotor core, wherein the rotor core is provided with a plurality of magnetic steel slots (1) penetrating the rotor core in an axial direction, wherein the plurality of magnetic steel slots (1) are arranged in an annular shape, and wherein: The end of the rotor core comprises a first region (2) corresponding one-to-one to the magnetic steel slot (1) and located outside the magnetic steel slot (1), and a second region (3) corresponding one-to-one to the q-axis and located on the q-axis, and at least one of the first regions (2) at the end of the rotor core is partially or entirely lower than the second region (3) adjacent to the first region (2); The first region (2) comprises magnetic isolation bridges (21) corresponding to two sides of the same magnetic steel, and a spacing portion (22) located between the two magnetic isolation bridges (21).

2. The rotor structure according to claim 1, characterized in that: The height of each magnetic steel inserted into each magnetic steel slot (1) is no higher than the height of the corresponding first area (2).

3. The rotor structure according to claim 1, characterized in that: Each of the first regions (2) at the end of the rotor core is partially or entirely lower than the second region (3) adjacent thereto.

4. The rotor structure according to claim 1, characterized in that: At both ends of the rotor core, there is at least one first region (2) that is partially or entirely lower than the second region (3) adjacent to the first region (2).

5. The rotor structure according to claim 4, characterized in that: Each of the first regions (2) at both ends of the rotor core is partially or entirely lower than the second region (3) adjacent thereto.

6. The rotor structure according to claim 1, characterized in that: The d-axis of the rotor structure passes through the first region (2).

7. The rotor structure according to claim 1, characterized in that: The rotor core is formed by stacking a plurality of laminations.

8. The rotor structure according to claim 7, characterized in that: The laminate comprises a first laminate (4) and a second laminate (5), wherein the second laminate (5) lacks the first region (2) relative to the first laminate (4), and the second laminate (5) is laminated on both ends of a portion laminated by the first laminate (4).

9. A motor, characterized in that: It comprises a rotor structure, and the rotor structure is the rotor structure according to any one of claims 1-8.

10. An electrical appliance, characterized in that: It comprises a motor, wherein the motor is the motor as claimed in claim 9.

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