Rotor core, rotor assembly, motor and household appliance

Abstract

The invention provides a rotor iron core, a rotor assembly, a motor and a household electrical appliance, the rotor iron core comprises an iron core body and 2N magnetic pole structures, each magnetic pole structure comprises a magnetic steel groove, a first magnetic isolation groove and two second magnetic isolation grooves, the magnetic steel groove extends in a long strip shape in the radial direction of the iron core body, the radial outer ends of the magnetic steel grooves penetrate through the outer circumferential face of the iron core body, the first magnetic isolation grooves and the radial inner ends of the magnetic steel grooves are located between the magnetic steel grooves and the shaft hole in a communicating mode, and the two second magnetic isolation grooves are symmetrically formed in the circumferential direction of the iron core body relative to the magnetic steel grooves and are close to the outer circumferential face of the iron core body. The center line of each second magnetic isolation groove extends in a circular arc shape, and the radial outer ends, away from the magnetic steel grooves, of the second magnetic isolation grooves are outwards bent in a protruding mode. The rotor iron core can effectively reduce magnetic leakage, the effect of reducing the magnetic leakage is better, and the demagnetization resistance is enhanced, so that the operation efficiency of a motor is improved, and the operation energy efficiency of household appliances is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motor manufacturing, and in particular to a rotor core, a rotor assembly having the rotor core, a motor having the rotor assembly, and a household appliance having the motor. Background Art

[0002] The high-efficiency development of household appliances is a key direction, especially the high-efficiency development of air conditioners. Most of the compressors of high-efficiency air conditioners use permanent magnet synchronous motors, and the leakage of tangential magnetic flux in permanent magnet synchronous motors is a serious problem, especially under high-frequency operation, which leads to a decrease in the operating efficiency of the motor, thereby affecting the operating efficiency of the compressor and air conditioner.

[0003] In order to reduce magnetic leakage, existing motors are provided with magnetic isolation holes on the rotor core. The magnetic isolation holes are designed to be in the shape of strip holes, waist holes, triangular holes, trapezoidal holes, and circular holes. However, the effects of these magnetic isolation holes in reducing magnetic leakage are not ideal, so that there is still a large amount of magnetic leakage during the operation of the motor, which affects the operating efficiency of the motor, and then affects the operating energy efficiency of household appliances, and the anti-demagnetization ability is insufficient. Summary of the invention

[0004] The first object of the present invention is to provide a rotor core that can effectively reduce magnetic leakage, reduce magnetic leakage more effectively and enhance anti-demagnetization ability, thereby improving the operating efficiency of the motor and further improving the operating energy efficiency of household appliances.

[0005] A second object of the present invention is to provide a rotor assembly having the above rotor core.

[0006] A third object of the present invention is to provide a motor having the above rotor assembly.

[0007] A fourth object of the present invention is to provide a household appliance having the above motor.

[0008] In order to achieve the first purpose of the present invention, the present invention provides a rotor core, including a core body and 2N magnetic pole structures. The axis of the core body is penetrated by an axial hole, which is used to be sleeved on the motor shaft. The 2N magnetic pole structures are evenly distributed in the circumferential direction of the core body, N is a positive integer, and each magnetic pole structure includes a magnetic steel slot, a first magnetic isolation slot and two second magnetic isolation slots. The magnetic steel slot extends in a long strip shape in the radial direction of the core body and is used to accommodate magnets, and the radial outer end of the magnetic steel slot passes through the outer circumferential surface of the core body. The first magnetic isolation slot is connected to the radial inner end of the magnetic steel slot and is located between the magnetic steel slot and the axial hole. The two second magnetic isolation slots are symmetrically arranged about the magnetic steel slot in the circumferential direction of the core body and close to the outer circumferential surface of the core body. The center line of each second magnetic isolation slot extends in a circular arc shape, and the second magnetic isolation slot is convexly curved away from the radial outer end of the magnetic steel slot.

[0009] It can be seen from the above scheme that the 2N magnetic pole structures of the rotor core of the present invention are evenly distributed in the circumferential direction of the core body, and the magnetic steel slot of each magnetic pole structure extends in a long strip shape in the radial direction of the core body, and the radial outer end of the magnetic steel slot is set through the outer peripheral surface of the core body, thereby cutting the magnetic pole into N sector-shaped magnetic pole areas, so that there is no magnetic flux channel directly connected to the core at the outer periphery of the core body between two adjacent sector-shaped magnetic pole areas, which can effectively reduce the magnetic leakage of the rotor assembly at this position. In addition, the first magnetic isolation slot of each magnetic pole structure of the rotor core of the present invention is connected to the radial inner end of the magnetic steel slot and is located between the magnetic steel slot and the shaft hole, thereby increasing the magnetic leakage barrier of the radial inner end of the magnetic steel slot close to the rotor axis, which can effectively reduce the magnetic leakage of the rotor assembly at this position. In addition, the two second magnetic isolation grooves of each magnetic pole structure of the rotor core of the present invention are symmetrically arranged about the magnetic steel slot in the circumferential direction of the core body and close to the outer circumferential surface of the core body. The center line of each second magnetic isolation groove extends in an arc shape, and the second magnetic isolation groove is convexly curved away from the radial outer end of the magnetic steel slot. By designing the second magnetic isolation groove to extend in a convexly curved arc shape away from the radial outer end of the magnetic steel slot, it can be ensured that the magnetic circuit channel near the radial outer end of the magnetic steel slot is smaller. On the one hand, it can effectively limit the leakage magnetic flux at the radial outer end of the magnetic steel slot, and on the other hand, it can reduce the demagnetization of the radial outer end of the magnetic steel slot, thereby enhancing the anti-demagnetization ability.

[0010] Therefore, the rotor core of the present invention can effectively reduce magnetic leakage, and the effect of reducing magnetic leakage is better, and can also enhance the anti-demagnetization ability, thereby improving the motor operating efficiency of the rotor assembly composed of the rotor core, and then improving the operating energy efficiency of household appliances with the motor.

[0011] A preferred solution is that the width of the second magnetic isolation groove in the direction of its arc radius is B1, the width of the magnetic steel groove in the circumferential direction of the core body is D1, and And / or, the first minimum spacing between the second magnetic isolation groove and the outer peripheral surface of the core body is B2, and the first minimum spacing B2 is between 0.3 mm and 0.5 mm; and / or, the second minimum spacing between the second magnetic isolation groove and the magnetic steel groove is B3, and the second minimum spacing B3 is between 0 mm and 0.5 mm; and / or, the radius R1 of the center line of the second magnetic isolation groove is between 17 mm and 23 mm.

[0012] A further solution is that the first end of the second magnetic isolation groove close to the outer circumferential surface of the core body is a first arc end, and the second end of the second magnetic isolation groove away from the outer circumferential surface of the core body is a second arc end, the diameter of the second arc end is equal to the diameter of the first arc end, the axis of the second arc end is connected to the axis of the first arc end to form an end line, and the angle β between the end line and the magnetic steel slot is between 25° and 45°.

[0013] A further solution is that a protrusion is provided on at least one of the two opposite side surfaces of the core body in the circumferential direction at the radial outer end of the magnetic steel slot, the protrusion extends toward the middle of the magnetic steel slot in the circumferential direction of the core body, and the protrusion is located on the outside of the magnet in the radial direction of the core body, and a notch is formed between the protrusion and the opposite side surface of the magnetic steel slot in the circumferential direction of the core body or another protrusion on the opposite side surface.

[0014] A further solution is that the width of the magnetic steel slot in the circumferential direction of the core body is D1; ​​the width of the slot in the circumferential direction of the core body is D2, and and / or, the width of the protrusion in the radial direction of the core body is D3, and

[0015] A further solution is that the first magnetic isolation groove extends in a long strip shape in the radial direction of the core body, and in the circumferential direction of the core body, the center line of the first magnetic isolation groove coincides with the center line of the magnetic steel groove.

[0016] A further solution is that the width of the magnetic steel slot in the circumferential direction of the core body is D1, the width of the first magnetic isolation slot in the circumferential direction of the core body is D4, and and / or, the length of the magnetic steel slot in the radial direction of the core body is L1, the length of the first magnetic isolation slot in the radial direction of the core body is L2, and

[0017] A further solution is that the length of the magnetic steel slot in the radial direction of the core body is L1; the outer radius of the core body is R2, and and / or, the width of the magnetic steel slot in the circumferential direction of the core body is D1, and And / or, the number of magnetic pole structures is 6≤2N≤10.

[0018] In order to achieve the second object of the present invention, the present invention provides a rotor assembly, including multiple magnets and a rotor core, the rotor core is the above-mentioned rotor core, and a magnet is accommodated in a magnetic steel slot of the rotor core.

[0019] In order to achieve the third purpose of the present invention, the present invention provides a motor, including a rotating shaft and a rotor assembly, the rotor assembly is the above-mentioned rotor assembly, and the shaft hole of the rotor assembly is sleeved on the rotating shaft.

[0020] In order to achieve the fourth objective of the present invention, the present invention provides a household appliance, comprising a motor, which is the above-mentioned motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of a rotor assembly embodiment of the present invention.

[0022] Figure 2 yes Figure 1Enlarged view at A.

[0023] Figure 3 Schematic diagram of a first implementation of a rotor core in a rotor assembly embodiment of the present invention.

[0024] Figure 4 yes Figure 3 Enlarged view at B.

[0025] Figure 5 yes Figure 3 Enlarged view at C.

[0026] Figure 6 Schematic diagram of a second embodiment of the rotor core in the rotor assembly embodiment of the present invention.

[0027] Figure 7 Schematic diagram of a third embodiment of a rotor core in a rotor assembly embodiment of the present invention.

[0028] Figure 8 Schematic diagram of a fourth embodiment of a rotor core in a rotor assembly embodiment of the present invention.

[0029] Fig. 9 It is a comparison simulation diagram of frequency-efficiency between the motor embodiment of the present invention and a common motor.

[0030] The present invention is further described below in conjunction with the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0031] See also Figures 1 to 5The present embodiment discloses a rotor assembly 10 of a motor, and the rotor assembly 10 includes a plurality of magnets 12 and a rotor core 11. The rotor core 11 of the present embodiment includes a core body 111 and 2N magnetic pole structures, and an axial hole 1111 is formed through the axis of the core body 111, and the axial hole 1111 is used to be sleeved on the motor shaft, and the 2N magnetic pole structures are evenly distributed in the circumferential direction of the core body 111, and N is a positive integer. Furthermore, each magnetic pole structure includes a magnetic steel slot 1112, a first magnetic isolation slot 1113 and two second magnetic isolation slots 1114. The magnetic steel slot 1112 extends in a long strip shape in the radial direction of the core body 111 and is used to accommodate the magnet 12. The radial outer end of the magnetic steel slot 1112 passes through the outer circumferential surface of the core body 111. The first magnetic isolation slot 1113 is connected to the radial inner end of the magnetic steel slot 1112 and is located between the magnetic steel slot 1112 and the axial hole 1111. The two second magnetic isolation slots 1114 are symmetrically arranged about the magnetic steel slot 1112 in the circumferential direction of the core body 111 and close to the outer circumferential surface of the core body 111. The center line 11144 of each second magnetic isolation slot 1114 extends in a circular arc shape, and the second magnetic isolation slot 1114 is convexly curved outward away from the radial outer end of the magnetic steel slot 1112. Specifically, a magnet 12 in the rotor assembly 10 of this embodiment is accommodated in a magnetic steel slot 1112 of the rotor core 11. Further, the motor includes a rotating shaft and the rotor assembly 10 of this embodiment, and the shaft hole 1111 of the rotor assembly 10 of this embodiment is sleeved on the rotating shaft.

[0032] The 2N magnetic pole structures of the rotor core 11 of this embodiment are evenly distributed in the circumferential direction of the core body 111, and the magnetic steel slot 1112 of each magnetic pole structure extends in a long strip shape in the radial direction of the core body 111, and the radial outer end of the magnetic steel slot 1112 is set through the outer peripheral surface of the core body 111, thereby cutting the magnetic pole into 2N sector-shaped magnetic pole areas, so that there is no magnetic flux channel directly connected to the core at the outer periphery of the core body 111 between two adjacent sector-shaped magnetic pole areas, which can effectively reduce the magnetic leakage of the rotor assembly 10 at this position. In addition, the first magnetic isolation slot 1113 of each magnetic pole structure of the rotor core 11 of this embodiment is connected to the radial inner end of the magnetic steel slot 1112 and is located between the magnetic steel slot 1112 and the shaft hole 1111, thereby increasing the magnetic leakage barrier of the radial inner end of the magnetic steel slot 1112 close to the rotor axis, which can effectively reduce the magnetic leakage of the rotor assembly 10 at this position. In addition, the two second magnetic isolation grooves 1114 of each magnetic pole structure of the rotor core 11 of the present embodiment are symmetrically arranged about the magnetic steel slot 1112 in the circumferential direction of the core body 111 and are arranged close to the outer circumferential surface of the core body 111. The center line 11144 of each second magnetic isolation groove 1114 extends in a circular arc shape, and the second magnetic isolation groove 1114 is convexly curved away from the radial outer end of the magnetic steel slot 1112. By designing the second magnetic isolation groove 1114 to extend in a convexly curved circular arc shape away from the radial outer end of the magnetic steel slot 1112, it is possible to ensure that the magnetic circuit channel near the radial outer end of the magnetic steel slot 1112 is smaller. On the one hand, it can effectively limit the leakage magnetic flux at the radial outer end of the magnetic steel slot 1112, and on the other hand, it can reduce the demagnetization of the radial outer end of the magnetic steel slot 1112, thereby enhancing the anti-demagnetization capability.

[0033] Therefore, the rotor core 11 of this embodiment can effectively reduce magnetic leakage, and the effect of reducing magnetic leakage is better, and the anti-demagnetization ability can be enhanced, thereby improving the motor operation efficiency of the rotor assembly 10 composed of the rotor core 11, and further improving the operation energy efficiency of the household appliance having the motor. Specifically, Fig. 9 As shown, compared with the existing ordinary motor without the first magnetic isolation groove 1113 and the second magnetic isolation groove 1114, the operating efficiency of the motor with the rotor assembly 10 of this embodiment is greatly improved, especially when the operating frequency is greater than 60Hz. It can be seen that the operating efficiency of the motor with the rotor assembly 10 of this embodiment is more advantageous when operating at high frequency.

[0034] In this embodiment, the outer radius of the core body 111 is R2, the length of the magnetic steel slot 1112 in the radial direction of the core body 111 is L1, and the width of the magnetic steel slot 1112 in the circumferential direction of the core body 111 is D1. and With this size design of the magnetic steel slot 1112 , it is possible to ensure that the rotor assembly 10 provides a stronger magnetic field, which is beneficial to improving the energy efficiency of the motor.

[0035] In addition, in this embodiment, the radial outer end of the magnetic steel slot 1112 is provided with a protrusion 1115 protruding from at least one of the two opposite side surfaces in the circumferential direction of the core body 111, and the protrusion 1115 extends toward the middle of the magnetic steel slot 1112 in the circumferential direction of the core body 111, and the protrusion 1115 is located on the outer side of the magnet 12 in the radial direction of the core body 111, and a notch 1116 is formed between the protrusion 1115 and the opposite side surface of the magnetic steel slot 1112 in the circumferential direction of the core body 111 or another protrusion 1115 on the opposite side surface. The radial outer end of the magnetic steel slot 1112 is provided with a protrusion 1115 protruding from one of the two opposite side surfaces in the circumferential direction of the core body 111, as shown in FIG. Figure 2 As shown; and the radial outer ends of the magnetic steel slots 1112 are provided with protrusions 1115 on both sides of the circumferential direction of the core body 111, as shown Figure 8 Thus, in this embodiment, the radial outer end of the magnetic steel slot 1112 is provided with a protrusion 1115 on at least one of the two opposite side surfaces in the circumferential direction of the core body 111. The protrusion 1115 is located on the outer side of the magnet 12 in the radial direction of the core body 111, so that the magnet 12 can be stably confined in the magnetic steel slot 1112.

[0036] Specifically, in this embodiment, the width of the slot 1116 in the circumferential direction of the core body 111 is D2, and the width of the protrusion 1115 in the radial direction of the core body 111 is D3. and Thereby, the structural strength of the protrusion 1115 is ensured while the magnetic circuit channel near the radial outer end of the magnetic steel slot 1112 is ensured to be narrow enough, so that less magnetic flux passes through this place, thereby reducing leakage magnetic flux.

[0037] In addition, the first magnetic isolation groove 1113 of the present embodiment extends in a long strip shape in the radial direction of the core body 111, and the center line of the first magnetic isolation groove 1113 coincides with the center line of the magnetic steel groove 1112 in the circumferential direction of the core body 111. Specifically, the width of the first magnetic isolation groove 1113 in the circumferential direction of the core body 111 is D4, and the length of the first magnetic isolation groove 1113 in the radial direction of the core body 111 is L2. and Under the size restriction of the first magnetic isolation slot 1113, the magnetic path at the radial inner end of the magnetic steel slot 1112 is also restricted to be longer, ensuring that more magnetic flux passes through the air gap to the stator core.

[0038] In addition, the first end of the second magnetic isolation groove 1114 of the present embodiment close to the outer circumference of the core body 111 is a first arc end 11141, and the second end of the second magnetic isolation groove 1114 away from the outer circumference of the core body 111 is a second arc end 11142, the diameter of the second arc end 11142 is equal to the diameter of the first arc end 11141, and the axis of the second arc end 11142 is connected to the axis of the first arc end 11141 to form an end line 11143, and the angle β between the end line 11143 and the magnetic steel groove 1112 is between 25° and 45°, and the width of the second magnetic isolation groove 1114 of the present embodiment in the direction of its arc radius is B1, and the width of the magnetic steel groove 1112 in the circumferential direction of the core body 111 is D1, and Therefore, under the restriction of the arc-shaped second magnetic isolation groove 1114, the magnetic circuit channel at the radial outer end of the magnetic steel groove 1112 is more restricted. On the one hand, the leakage magnetic flux at the radial outer end of the magnetic steel groove 1112 is limited, and on the other hand, the demagnetization of the radial outer end of the magnetic steel groove 1112 can be reduced.

[0039] Furthermore, in the present embodiment, the first minimum spacing between the second magnetic isolation groove 1114 and the outer peripheral surface of the core body 111 is B2, and the first minimum spacing B2 is between 0.3 mm and 0.5 mm, and the first minimum spacing B2 forms a first end magnetic isolation bridge. In the present embodiment, the second minimum spacing between the second magnetic isolation groove 1114 and the magnetic steel groove 1112 is B3, and the second minimum spacing B3 is between 0 mm and 0.5 mm, and the second minimum spacing B3 forms a second end magnetic isolation bridge. In the present embodiment, the middle part of the second magnetic isolation groove 1114 has an arc-shaped center line 11144, and the radius R1 of the center line 11144 is between 17 mm and 23 mm, so as to further optimize the magnetic circuit of the radial outer end of the magnetic steel groove 1112, so that the magnetic isolation bridges at both ends of the second magnetic isolation groove 1114 are narrower while ensuring the structural strength, and the magnetic field magnetic circuit is reduced through the magnetic isolation bridges at both ends, so that the magnetic field of the rotor assembly 10 can penetrate deeper into the magnet 12 on the rotor axis side during magnetization, so that the magnet 12 can be more saturated.

[0040] Furthermore, in this embodiment, the number of magnetic pole structures is 6≤2N≤10. When 2N is 6, the six magnetic pole structures are evenly distributed in the circumferential direction of the core body 111. Figure 3 When 2N is 8, the 8 magnetic pole structures are evenly distributed in the circumferential direction of the core body 111, as shown in FIG. Figure 6 When 2N is 10, 10 magnetic pole structures are evenly distributed in the circumferential direction of the core body 111, as shown in FIG. Figure 7 shown.

[0041] The above embodiments are only preferred examples of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made according to the structure, characteristics and principles of the patent application scope of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. A rotor core, comprising a core body, wherein the core body has an axial hole extending through the axial center thereof, and the axial hole is used for sleeve connection on a motor shaft, and is characterized in that: The rotor core further comprises 2N magnetic pole structures, the 2N magnetic pole structures are evenly distributed in the circumferential direction of the core body, and N is a positive integer; Each of the magnetic pole structures includes a magnetic steel slot, a first magnetic isolation slot and two second magnetic isolation slots. The magnetic steel slot extends in a long strip shape in the radial direction of the core body and is used to accommodate magnets. The radial outer end of the magnetic steel slot passes through the outer circumferential surface of the core body. The first magnetic isolation slot is connected to the radial inner end of the magnetic steel slot and is located between the magnetic steel slot and the axial hole. The two second magnetic isolation slots are symmetrically arranged about the magnetic steel slot in the circumferential direction of the core body and close to the outer circumferential surface of the core body. The center line of each second magnetic isolation slot extends in a circular arc shape, and the second magnetic isolation slot is convexly curved away from the radial outer end of the magnetic steel slot.

2. The rotor core according to claim 1, characterized in that: The width of the second magnetic isolation groove in the direction of its arc radius is B1, the width of the magnetic steel groove in the circumferential direction of the core body is D1, and And / or, a first minimum distance between the second magnetic isolation groove and the outer peripheral surface of the core body is B2, and the first minimum distance B2 is between 0.3 mm and 0.5 mm; And / or, the second minimum distance between the second magnetic isolation groove and the magnetic steel groove is B3, and the second minimum distance B3 is between 0 mm and 0.5 mm; And / or, the radius R1 of the center line of the second magnetic isolation groove is between 17 mm and 23 mm.

3. The rotor core according to claim 1, characterized in that: The first end of the second magnetic isolation groove close to the outer circumference of the core body is a first arc end, and the second end of the second magnetic isolation groove away from the outer circumference of the core body is a second arc end, and the diameter of the second arc end is equal to the diameter of the first arc end; The axis of the second arc end is connected to the axis of the first arc end to form an end line, and the angle β between the end line and the magnetic steel slot is between 25° and 45°.

4. The rotor core according to claim 1, characterized in that: The radial outer end of the magnetic steel slot is provided with a protrusion protruding from at least one of the two opposite side surfaces in the circumferential direction of the core body, and the protrusion extends toward the middle of the magnetic steel slot in the circumferential direction of the core body, and the protrusion is located on the outside of the magnet in the radial direction of the core body, and a notch is formed between the protrusion and the opposite side surface of the magnetic steel slot in the circumferential direction of the core body or another protrusion on the opposite side surface.

5. The rotor core according to claim 4, characterized in that: The width of the magnetic steel slot in the circumferential direction of the core body is D1; The width of the slot in the circumferential direction of the core body is D2, and and / or, the width of the protrusion in the radial direction of the core body is D3, and 6. The rotor core according to claim 1, characterized in that: The first magnetic isolation groove extends in a long strip shape in the radial direction of the core body; In the circumferential direction of the core body, the center line of the first magnetic isolation groove coincides with the center line of the magnetic steel groove.

7. The rotor core according to claim 6, characterized in that: The width of the magnetic steel slot in the circumferential direction of the core body is D1, the width of the first magnetic isolation slot in the circumferential direction of the core body is D4, and and / or, the length of the magnetic steel slot in the radial direction of the core body is L1, the length of the first magnetic isolation slot in the radial direction of the core body is L2, and 8. The rotor core according to any one of claims 1 to 7, characterized in that: The length of the magnetic steel slot in the radial direction of the core body is L1; The outer radius of the core body is R2, and and / or, the width of the magnetic steel slot in the circumferential direction of the core body is D1, and And / or, the number of the magnetic pole structures is 6≤2N≤10.

9. A rotor assembly comprising a plurality of magnets and a rotor core, characterized in that: The rotor core is the rotor core described in any one of claims 1 to 8; One of the magnets is accommodated in a magnetic steel slot of the rotor core.

10. A motor, comprising a shaft and a rotor assembly, characterized in that: The rotor assembly is the rotor assembly as described in claim 9 above; The shaft hole of the rotor assembly is sleeved on the rotating shaft.

11. A household appliance, including a motor, characterized in that: The motor is the motor described in claim 10 above.

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