CN218633493U - Motor rotor, motor and compressor - Google Patents
Motor rotor, motor and compressor Download PDFInfo
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- CN218633493U CN218633493U CN202222722724.XU CN202222722724U CN218633493U CN 218633493 U CN218633493 U CN 218633493U CN 202222722724 U CN202222722724 U CN 202222722724U CN 218633493 U CN218633493 U CN 218633493U
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Abstract
The technical scheme of the utility model is through providing a motor rotor, motor and compressor, including rotor core and permanent magnet, the rotor core is provided with the multiunit magnetic barrier along its circumference, and every group magnetic barrier includes curved groove, and curved groove both ends extend towards the edge of rotor core, are provided with a plurality of magnetic barrier holes between the edge of curved groove's inner cell wall and rotor core, and a plurality of magnetic barrier holes set up along the extending direction interval of curved groove's inner cell wall to form at least one deck magnetic barrier pore layer; the permanent magnet is embedded in the curved groove. Because only one layer of permanent magnet is arranged on the motor rotor, the using amount of the permanent magnet is greatly reduced, the production cost is reduced, and the production takt of the motor is improved. Meanwhile, the ratio of the thickness T of the permanent magnet in the direction of the straight shaft of the motor rotor to the sum G of the thicknesses of the magnetic barrier holes in all layers is optimized and adjusted, so that the magnetic density of the permanent magnet is uniformly distributed, the influence of saturation effect is reduced, the output torque of the motor rotor is effectively increased, and the performance of the motor rotor is improved.
Description
Technical Field
The utility model relates to a compressor technical field, in particular to electric motor rotor, motor and compressor.
Background
The synchronous reluctance motor is provided with a plurality of layers of rotor magnetic barriers and works by means of reluctance torque generated by asymmetry of a rotor magnetic circuit. The motor has the advantages of low cost, simple manufacture and small rotor loss, but has the disadvantages of low power factor and torque density and large torque ripple. In order to improve the torque and the power factor of the motor, certain low-performance permanent magnet (ferrite or bonded neodymium iron boron) can be inserted into the rotor magnetic barrier for auxiliary excitation, so that the excitation component of the motor current can be reduced, and the permanent magnet torque can be generated, namely the permanent magnet auxiliary synchronous reluctance motor.
The permanent magnet auxiliary synchronous reluctance motor is used as a combination of the permanent magnet synchronous motor and the synchronous reluctance motor, the reluctance torque of the synchronous reluctance motor is utilized to the maximum extent, the permanent magnet torque is adopted for assistance, the advantages of the two motors are integrated, and the permanent magnet auxiliary synchronous reluctance motor is higher in efficiency and power factor, so that more and more attention is paid to the permanent magnet auxiliary synchronous reluctance motor.
In the prior art, the performance of a motor is improved mainly by improving the performance of a permanent magnet, namely, the value of a composite torque is improved by improving the torque of the permanent magnet, so that the efficiency of the motor is improved, and a common method is to embed a rare earth permanent magnet. However, since rare earth is a non-renewable resource and is expensive, wider application of the motor is limited.
In addition, most of the current permanent magnet assisted synchronous reluctance motors adopt a structure of arranging two or more layers of permanent magnets (magnetic steel), so that the motor cost is high, the demagnetization resistance is weak, the output torque of a motor rotor is small, and the performance of the motor rotor is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model mainly aims at providing an electric motor rotor aims at improving electric motor rotor's performance.
The utility model discloses technical scheme is through providing an electric motor rotor, include:
the magnetic barrier structure comprises a rotor core, wherein a plurality of groups of magnetic barriers are arranged on the rotor core along the circumferential direction of the rotor core, each group of magnetic barriers comprises a curved slot, two ends of the curved slot extend towards the edge of the rotor core, a plurality of magnetic barrier holes are arranged between the inner slot wall of the curved slot and the edge of the rotor core, and the plurality of magnetic barrier holes are arranged at intervals along the extending direction of the inner slot wall of the curved slot and form at least one layer of magnetic barrier hole layer;
the permanent magnet is embedded into the curved groove;
the thickness of the permanent magnet in the direction of a straight shaft of the motor rotor is T, the distance from one side far away from the curved groove to the other side close to the curved groove of the magnetic barrier hole in a single layer is the thickness of the magnetic barrier hole, the sum of the thicknesses of the magnetic barrier holes in all layers is G, and G and T meet the following conditions: G/T is not more than 1 and not less than 0.1.
In an embodiment, 2-6 magnetic barrier holes are arranged between the inner groove wall of the curved groove and the edge of the rotor core, and the magnetic barrier holes are arranged at intervals along the extending direction of the inner groove wall of the curved groove and form a layer of the magnetic barrier hole layer.
In one embodiment, the magnetic barrier orifice layer comprises four magnetic barrier orifices.
In one embodiment, the barrier hole has a thickness g, and g and T satisfy: g/T is not more than 1 and not less than 0.1.
In one embodiment, the plurality of magnetic barrier holes form two magnetic barrier hole layers, each magnetic barrier hole layer comprises a first magnetic barrier hole layer and a second magnetic barrier hole layer, and the first magnetic barrier hole layer is formed between the second magnetic barrier hole layer and the curved groove.
In one embodiment, the first magnetic barrier layer has a thickness g 1 The second magnetic barrier layerIs g 2 ，g 1 、g 2 And T satisfies: (g) 1 +g 2 ) the/T is not more than 1 and not less than 0.1.
In one embodiment, the magnetic barrier hole has a trapezoidal shape with rounded corners.
In one embodiment, in a cross section perpendicular to the axial direction of the motor rotor, the minimum width of two ends of the permanent magnet is E, and T and E satisfy the following condition: t is not less than E.
In one embodiment, a gap is formed between both ends of the curved slot and the permanent magnet.
In one embodiment, the gap is filled with a non-magnetic conductive medium.
In one embodiment, the curved slot is arcuate.
In one embodiment, the curved groove includes a first mounting groove extending along a quadrature axis direction of the motor rotor and a second mounting groove symmetrical to the first mounting groove about a direct axis of the motor rotor; the curved slot further comprises a third mounting slot, and two ends of the third mounting slot are communicated with one ends, close to the rotor core, of the first mounting slot and one ends, close to the rotor core, of the second mounting slot respectively.
In one embodiment, the third mounting groove is arc-shaped or linear.
In one embodiment, the rotor core is provided with 4-8 groups of magnetic barriers along the circumferential direction, and the permanent magnets in any two adjacent and any two opposite groups of magnetic barriers have opposite magnetic poles at one side close to the center of the motor rotor.
The utility model also provides a motor, motor includes electric motor rotor, electric motor rotor includes:
the magnetic barrier structure comprises a rotor core, wherein a plurality of groups of magnetic barriers are arranged on the rotor core along the circumferential direction of the rotor core, each group of magnetic barriers comprises a curved groove, two ends of the curved groove extend towards the edge of the rotor core, a plurality of magnetic barrier holes are formed between the inner groove wall of the curved groove and the edge of the rotor core, the plurality of magnetic barrier holes are arranged at intervals along the extending direction of the inner groove wall of the curved groove, and at least one layer of magnetic barrier hole layer is formed;
the permanent magnet is embedded into the curved groove;
the thickness of the permanent magnet in the direction of a straight shaft of the motor rotor is T, the distance from one side far away from the curved groove to the other side close to the curved groove of the magnetic barrier hole in a single layer is the thickness of the magnetic barrier hole, the sum of the thicknesses of the magnetic barrier holes in each layer is G, and G and T meet the following requirements: G/T is not more than 1 and not less than 0.1;
the motor also comprises a motor stator, the motor stator is sleeved on the periphery of the motor rotor, and the motor stator comprises a stator core and a winding wound on the stator teeth.
The utility model also provides a compressor, include the motor.
The technical scheme of the utility model through set up curved groove and magnetic barrier hole on electric motor rotor to at the embedded permanent magnet in curved groove. Because only one layer of permanent magnet is arranged on the motor rotor, the using amount of the permanent magnet is greatly reduced, the production cost is reduced, and the production takt of the motor is improved. Meanwhile, the ratio of the thickness T of the permanent magnet in the direction of the straight shaft of the motor rotor to the sum G of the thicknesses of the magnetic barrier holes in all layers is optimized and adjusted, so that the magnetic density of the permanent magnet is uniformly distributed, the influence of saturation effect is reduced, the output torque of the motor rotor is effectively increased, and the performance of the motor rotor is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic view of an embodiment of a rotor of an electric machine;
FIG. 2 is an enlarged view taken at A in FIG. 1;
FIG. 3 is a schematic structural view of another embodiment of a rotor of an electric machine;
FIG. 4 is an enlarged view at B in FIG. 3;
FIG. 5 is a schematic structural view of yet another embodiment of a rotor of an electric machine;
FIG. 6 is a schematic diagram showing the relationship between g/T of the motor rotor and the motor output torque;
FIG. 7 is a graph illustrating g/T of the rotor of the motor of FIG. 6 as a function of resultant torque;
FIG. 8 is a schematic structural view of a stator of the motor;
fig. 9 is a schematic diagram showing the relationship between the ratio of the height of the motor rotor to the height of the motor stator and the difference between the flux linkage and the inductance.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | |
100 | |
| 111 | |
200 | |
| 112 | |
110 | |
| 113 | |
120 | |
| 20 | |
22 | |
| 21 | Stator core |
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, back, 8230; \8230;) are provided in the embodiments of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, if appearing throughout the text, "and/or" is meant to include three juxtaposed aspects, taking "A and/or B" as an example, including either the A aspect, or the B aspect, or both A and B satisfied aspects. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The synchronous reluctance motor is provided with a plurality of layers of rotor magnetic barriers and works by means of reluctance torque generated by asymmetry of a rotor magnetic circuit. The motor has the advantages of low cost, simple manufacture and small rotor loss, but has the disadvantages of low power factor and torque density and large torque ripple. In order to improve the torque and the power factor of the motor, certain low-performance permanent magnet (ferrite or bonded neodymium iron boron) can be inserted into the rotor magnetic barrier for auxiliary excitation, so that the excitation component of the motor current can be reduced, and the permanent magnet torque can be generated, namely the permanent magnet auxiliary synchronous reluctance motor.
When designing the permanent magnet in the magnetic barrier, the influence of the permanent magnet flux on the saturation degree of the magnetic circuit needs to be considered. Magnetic circuit saturation is easily caused by overlarge permanent magnetic flux, and the salient pole rate of the rotor is reduced; and if the permanent magnetic flux is too small, the improvement of the torque and the power factor is small. Although the low-performance permanent magnet has lower coercive force, the demagnetization curve linearity is better, and the multilayer magnetic barrier structure can improve the demagnetization resistance. In the prior art, the performance of a motor is improved mainly by improving the performance of permanent magnets, namely, the value of the composite torque is improved by improving the permanent magnet torque, so that the efficiency of the motor is improved, and a common method is to embed rare earth permanent magnets. However, since rare earth is a non-renewable resource and is expensive, the wider application of this motor is limited.
In addition, the current permanent magnet auxiliary synchronous reluctance motor mostly adopts a structure of arranging two or more layers of permanent magnets (magnetic steel), so that the motor is high in cost, weak in demagnetization resistance, small in output torque of a motor rotor and capable of influencing the performance of the motor rotor.
The technical scheme of the utility model through set up curved groove and magnetic barrier hole on electric motor rotor to at the embedded permanent magnet in curved groove. Because only one layer of permanent magnet is arranged on the motor rotor, the using amount of the permanent magnet is greatly reduced, the production cost is reduced, and the production takt of the motor is improved. Meanwhile, the ratio of the thickness T of the permanent magnet in the direction of the straight shaft of the motor rotor to the sum G of the thicknesses of the magnetic barrier holes in all layers is optimized and adjusted, so that the magnetic density of the permanent magnet is uniformly distributed, the influence of saturation effect is reduced, the output torque of the motor rotor is effectively increased, and the performance of the motor rotor is improved.
Referring to fig. 1 to 5, the present invention provides a motor rotor 10, including a rotor core 100 and a permanent magnet 200, the rotor core 100 is provided with a plurality of groups of magnetic barriers along a circumferential direction thereof, each group of magnetic barriers includes a curved slot 110, two ends of the curved slot 110 extend toward an edge of the rotor core 100, a plurality of magnetic barrier holes 120 are provided between an inner slot wall of the curved slot 110 and the edge of the rotor core 100, the plurality of magnetic barrier holes 120 are arranged at intervals along an extending direction of the inner slot wall of the curved slot 110, and at least one layer of magnetic barrier hole layer is formed; the permanent magnet 200 is embedded in the curved slot 110; wherein, the thickness of permanent magnet 200 on the direct axis direction of electric motor rotor 10 is T, and the distance of a single-layer magnetic barrier hole 120 from a side far away from curved groove 110 to another side near curved groove 110 is the thickness of magnetic barrier hole 120, and the sum of the thicknesses of each layer of magnetic barrier hole 120 is G, and G and T satisfy: G/T is not more than 1 and not less than 0.1.
Specifically, the utility model discloses technical scheme provides an electric motor rotor 10 can be applied to the supplementary synchronous reluctance motor of permanent magnetism. The motor rotor 10 includes a rotor core 100 and a permanent magnet 200, the rotor core 100 is driven by the magnetic action of the permanent magnet 200, and the motor rotor 10 can rotate relative to the motor stator to realize the normal operation of the motor. The rotor core 100 is formed by laminating high-permeability magnetic materials or silicon steel punching sheets, and is formed by laminating the high-permeability magnetic materials or the silicon steel punching sheets, so that the rotor core has high magnetic flux rate, high structural strength and convenience in processing.
The electromagnetic torque of the permanent magnet auxiliary synchronous reluctance motor consists of reluctance torque and permanent magnet torque, and the expression is as follows:
T＝p(Ld-Lq)id iq+pψpmiq
the first term is reluctance torque, and the second term is permanent magnet torque. p is the number of pole pairs of the motor, ld and Lq are respectively the d-axis and q-axis inductances, id and iq are respectively the components of the motor stator current space vector in the directions of the d-axis and q-axis, and psi pm is the flux linkage generated on the motor stator winding by the permanent magnet 200 of the motor rotor 10. In general, the d-axis direction is defined as the N-pole magnetic field direction of the permanent magnet 200 of the motor rotor 10, and the q-axis direction is the d-axis direction rotated counterclockwise by 90 ° in electrical angle. According to the formula, increasing the inductance difference between Ld and Lq and ψ pm can improve the output torque.
The rotor core 100 is provided with a plurality of sets of magnetic barriers along a circumferential direction thereof, each set including a curved groove 110 and a magnetic barrier hole 120. The curved slot 110 is bent back toward the center of the rotor core 100, and both ends of the curved slot 110 extend toward the edge of the rotor core 100. The permanent magnets 200 are embedded in the curved slots 110, and the motor rotor 10 can provide reluctance torque. Since the permanent magnet 200 is placed in the curved slot 110 and the magnetic resistance of the permanent magnet 200 itself is large and is equivalent to the magnetic permeability of air, the inductance Ld in the d-axis direction is small, and since the rotor core 100 itself has high magnetic permeability in the q-axis direction, the inductance Lq in the q-axis direction is large, thereby improving the reluctance torque of the motor rotor 10. In addition, the motor rotor 10 can also provide permanent magnet torque due to the insertion of the permanent magnets 200, thereby improving the output torque of the motor and improving the efficiency and performance of the motor. With the adoption of the method, the motor efficiency can be improved, and a method for improving the motor efficiency by adding the rare earth permanent magnet 200 can be replaced, so that the using amount of rare earth is reduced, on one hand, the energy is saved, the environmental burden is lightened, on the other hand, the cost is reduced, and the product competitiveness is improved.
A plurality of magnetic barrier holes 120 are formed between the inner wall of the curved slot 110 and the edge of the rotor core 100, the plurality of magnetic barrier holes 120 are arranged at intervals along the extending direction of the inner wall of the curved slot 110, and form at least one magnetic barrier layer, and air or a non-magnetic conductive medium can be filled in the magnetic barrier holes 120. A magnetic conduction channel is formed between two adjacent magnetic barrier holes 120, the magnetic resistance of the d-axis direction where the magnetic conduction channel is located is small, high magnetic flux is provided, and the inductance Ld is large; and the q-axis direction at the central line of the magnetic barrier hole 120 has very high magnetic resistance, the inductance Lq is small, and the inductance difference between the d-axis direction and the q-axis direction can be increased, so that the torque output capacity of the motor is improved. On the other hand, the magnetic barrier holes 120 are arranged between the inner slot wall of the curved slot 110 and the edge of the rotor core 100, so that the magnetic flux path can be normalized on the basis of reducing the influence on the permanent magnetic flux linkage, and the magnetic field harmonics in the air gap can be weakened. The magnetic saturation degree can be relieved, a magnetic barrier is formed in the rotating process of the motor rotor 10, so that the power density and the torque density of the motor are improved, the overload capacity of the motor is improved, the torque pulsation of the motor is effectively improved, the performance of the motor is greatly improved on the basis of reducing the using amount of the permanent magnet 200 of the motor, namely reducing the production cost, and the product competitiveness is improved.
Further, in order to ensure that the magnetic density distribution of the permanent magnet 200 is uniform and local saturation is avoided, the size of the magnetic barrier hole 120 should follow the principle of magnetomotive force distribution. The saturation effect can reduce the differential inductance of the motor and weaken the average torque of the motor, so the thickness relationship between the permanent magnet 200 and the magnetic barrier hole 120 needs to be reasonably controlled to avoid saturation so as to improve the output torque of the motor. The plurality of magnetic barrier holes 120 are spaced along the extension direction of the inner groove wall of the curved groove 110, and form at least one magnetic barrier hole layer. The distance from one side far away from the curved slot 110 to the other side near the curved slot 110 of the single-layer magnetic barrier hole 120 is the thickness of the magnetic barrier hole 120, and the sum of the thicknesses of the magnetic barrier holes 120 is G. For example, a plurality of magnetic barrier holes 120 are arranged at intervals along the extending direction of the inner wall of the curved slot 110, and form a layer of magnetic barrier hole layer, and G is the distance from one side far away from the curved slot 110 to the other side near the curved slot 110 of the layer of magnetic barrier holes 120; for another example, the plurality of magnetic barrier holes 120 are spaced along the extending direction of the inner wall of the curved slot 110, and two layers of magnetic barrier hole layers are formed, so G is the sum of the distance from one side far from the curved slot 110 to the other side near the curved slot 110 of the first magnetic barrier hole layer and the distance from one side far from the curved slot 110 to the other side near the curved slot 110 of the second magnetic barrier hole layer. When G and T satisfy: G/T is not more than 1 and is not less than 0.1, the magnetic density distribution of the permanent magnet 200 is relatively more uniform, and the influence of saturation effect can be effectively reduced, so that the output torque of the motor rotor 10 is effectively increased, and the performance of the motor rotor 10 is improved.
Referring to fig. 6 and 7, according to the experimental results, it is verified that saturation can be avoided by adjusting the thickness relationship between the permanent magnet 200 and the magnetic barrier hole 120, so as to improve the output torque of the motor. With the increase of G/T, the reluctance torque of the motor is gradually increased, but the permanent magnet torque of the motor is gradually reduced, and the composite torque of the motor is firstly gradually increased and then gradually reduced. When G and T satisfy: and when G/T is not more than 1 and not less than 0.1, the combined torque of the motor is more than 14.5NM. Thereby effectively increasing the output torque of the motor rotor 10 and improving the performance of the motor rotor 10.
In one embodiment, 2 to 6 barrier holes 120 are formed between the inner wall of the curved slot 110 and the edge of the rotor core 100, and the barrier holes 120 are spaced apart in the extending direction of the inner wall of the curved slot 110 and form a barrier hole layer.
Referring to fig. 1 and 2, the magnetic barrier holes 120 are spaced along an extending direction of an inner groove wall of the curved groove 110, and a magnetic conductive channel is formed between two adjacent magnetic barrier holes 120. When a single magnetic barrier hole 120 is provided, the reluctance torque decreases; when 6 or more magnetic barrier holes 120 are provided, the magnetic conductive path in the straight axis direction becomes narrow, the magnetic flux thereof decreases, the inductance Ld decreases, the difference in inductance between the d-axis and q-axis directions decreases, and the reluctance torque decreases. 2-6 magnetic barrier holes 120 are arranged at intervals along the extension direction of the inner slot wall of the curved slot 110, and form a magnetic barrier hole layer. The extending direction of the magnetic barrier layer is consistent with the extending direction of the inner slot wall of the curved slot 110. The reluctance torque is improved, and the performance of the motor is improved.
In one embodiment, the magnetic barrier layer includes four magnetic barrier holes 120.
Referring to fig. 1 and 2, four magnetic barrier holes 120 are formed between an inner wall of the curved slot 110 and an edge of the rotor core 100, and the four magnetic barrier holes 120 are spaced apart from each other along an extending direction of the inner wall of the curved slot 110 to form a magnetic barrier hole layer. A magnetic conduction channel is formed between every two adjacent magnetic barrier holes 120, the magnetic conduction channel in the direction of the straight axis has small resistance and high magnetic flux, and the inductance Ld is large; and the q-axis direction at the central line of the magnetic barrier hole 120 has high magnetic resistance, the inductance Lq is small, and the inductance difference between the d-axis direction and the q-axis direction can be increased, so that the torque output capacity of the motor is improved. The four magnetic barrier holes 120 are arranged at intervals along the extension direction of the inner slot wall of the curved slot 110, so that the magnetic force line path can be normalized on the basis of reducing the influence on the permanent magnetic flux linkage, the magnetic field harmonic in the air gap is weakened, and the magnetic saturation degree can be relieved. The output torque of the motor is improved, and the performance of the motor is improved.
In one embodiment, the thickness of the magnetic barrier hole 120 is g, and g and T satisfy: g/T is not more than 1 and not less than 0.1.
Referring to fig. 2, four magnetic barrier holes 120 are formed between an inner wall of the curved slot 110 and an edge of the rotor core 100, and the four magnetic barrier holes 120 are spaced apart from each other in an extending direction of the inner wall of the curved slot 110 to form a magnetic barrier hole layer. The distance from one side of the layer of magnetic barrier hole 120 far away from the curved slot 110 to the other side close to the curved slot 110 is the thickness G of the layer of magnetic barrier hole 120, and G is the same as G, so that G and T satisfy: g/T is not more than 1 and not less than 0.1. At this time, the magnetic density distribution of the permanent magnet 200 is relatively more uniform, and the influence of the saturation effect can be effectively reduced, so that the output torque of the motor rotor 10 is effectively increased, and the performance of the motor rotor 10 is improved.
In one embodiment, the plurality of magnetic barrier holes 120 form two magnetic barrier hole layers, including a first magnetic barrier hole layer and a second magnetic barrier hole layer, the first magnetic barrier hole layer being formed between the second magnetic barrier hole layer and the curved groove 110.
Referring to fig. 3 and 4, a plurality of magnetic barrier holes 120 are formed between an inner wall of the curved slot 110 and an edge of the rotor core 100, and the plurality of magnetic barrier holes 120 are spaced along an extending direction of the inner wall of the curved slot 110 to form two magnetic barrier hole layers, which are a first magnetic barrier hole layer and a second magnetic barrier hole layer, respectively. The first magnetic barrier hole layer is formed between the second magnetic barrier hole layer and the curved groove 110, and the extending direction of the first magnetic barrier hole layer and the second magnetic barrier hole layer is consistent with the extending direction of the inner groove wall of the curved groove 110. The plurality of magnetic barrier holes 120 form two magnetic barrier hole layers, and the reluctance torque is increased, so that the output torque of the motor is increased, and the performance of the motor rotor 10 is effectively improved.
In one embodiment, the first magnetic barrier layer has a thickness g 1 The thickness of the second magnetic barrier layer is g 2 ， g 1 、g 2 And T satisfies: (g) 1 +g 2 ) the/T is not more than 1 and not less than 0.1.
Referring to fig. 4, a plurality of magnetic barrier holes 120 are formed between an inner wall of the curved slot 110 and an edge of the rotor core 100, and the plurality of magnetic barrier holes 120 are spaced apart from each other along an extending direction of the inner wall of the curved slot 110 to form two magnetic barrier hole layers, which are a first magnetic barrier hole layer and a second magnetic barrier hole layer, respectively. Thickness g of the magnetic barrier hole 120 in the first magnetic barrier layer 1 The distance from one side far away from the curved slot 110 to the other side close to the curved slot 110 is the magnetic barrier hole 120; thickness g of the magnetic barrier hole 120 in the second magnetic barrier layer 2 The distance from one side far away from the curved slot 110 to the other side near the curved slot 110 is the magnetic barrier hole 120. The sum of the thicknesses of the magnetic barrier holes 120 of the first magnetic barrier layer and the second magnetic barrier layer is g 1 +g 2 ，g 1 +g 2 = G, then (G) 1 +g 2 ) the/T is not more than 1 and not less than 0.1. At this time, the magnetic density distribution of the permanent magnet 200 is relatively more uniform, and the influence of the saturation effect can be effectively reduced, so that the output torque of the motor rotor 10 is effectively increased, and the performance of the motor rotor 10 is improved.
In one embodiment, the flux barrier opening 120 has a trapezoidal shape with rounded corners.
Referring to fig. 1 to 5, a plurality of magnetic barrier holes 120 are disposed at intervals along an extending direction of an inner wall of the curved groove 110, each magnetic barrier hole 120 has one side close to the curved groove 110 and the other side far from the curved groove 110, and both sides extend along the extending direction of the curved groove 110. The length of one side of the magnetic barrier hole 120 close to the curved groove 110 is greater than the length of the other side of the magnetic barrier hole 120 far from the curved groove 110. Each corner of the magnetic barrier hole 120 is a rounded corner, and the bending direction of the rounded corner is consistent with the extending direction of the quadrature magnetic circuit, so that the magnetic circuit can pass through the rounded corner.
In one embodiment, in a cross section perpendicular to the axial direction of the motor rotor 10, the minimum width of both ends of the permanent magnet 200 is E, and T and E satisfy: t is not less than E.
Referring to fig. 2 and 4, the magnetic leakage effect of the permanent magnet 200 in the portion near the straight axis direction of the motor rotor 10 is weaker than that of the regions at both ends of the permanent magnet 200, which is more beneficial to increase the mechanical performance of the motor. Therefore, from the viewpoint of balancing electromagnetic performance and mechanical performance, the thickness of the permanent magnet 200 in the direction of the straight axis of the motor rotor 10 should be increased, and the thickness of both ends of the permanent magnet 200 should be decreased. On the other hand, in general, the arc permanent magnet 200 is easily subjected to local demagnetization in the middle inner surface area of the permanent magnet 200, and in order to alleviate the local demagnetization of the arc permanent magnet 200, the arc permanent magnet 200 may be designed to be thick in the middle and thin at both ends. In addition, the design of the permanent magnet 200 with different thicknesses can prevent the permanent magnet 200 from sliding in the curved slot 110.
In one embodiment, a gap is formed between both ends of the curved groove 110 and the permanent magnet 200.
Referring to fig. 1 to 5, according to the distribution of the demagnetization magnetic potential of the motor rotor 10, the d-axis armature magnetic potential enters the motor rotor 10 through the stator teeth and returns to the motor stator along the q-axis, and all the processes generate the demagnetization effect on the end of the permanent magnet 200 facing the teeth in the motor rotor 10. After the permanent magnet 200 is embedded into the curved slot 110, a gap is formed between both ends of the curved slot 110 and the permanent magnet 200, thereby effectively avoiding the situation that the magnetic potential of the d-axis armature is intensively acted on the end part of the permanent magnet 200, and improving the demagnetization current of the motor well.
In one embodiment, the gap is filled with a non-magnetic conductive medium.
In order to avoid the demagnetization of the portions of the permanent magnet 200 near the two ends of the curved slot 110, a gap is formed between the two ends of the curved slot 110 and the permanent magnet 200. The gap may be filled with a non-magnetic conductive medium or air. The gap can be filled with a non-magnetic medium with strength, so that the mechanical strength of the motor can be increased, and the permanent magnet 200 can be prevented from sliding in the curved groove 110 due to the fact that the permanent magnet is not abutted to the two ends of the curved groove 110. Air can be filled in the gap, so that the cost can be saved, and the production beat can be improved.
In one embodiment, the curved slot 110 is arcuate.
Referring to fig. 1 and 2, the curved slot 110 is formed in an arc shape, so that the magnetic density distribution of the rotor core 100 is more uniform, and the rotor core has the potential of further optimizing the design and increasing the torque density after the permanent magnet 200 is inserted. The arc-shaped curved slot 110 can be inserted with more permanent magnets 200, and the reluctance torque is fully utilized by adjusting the magnetic circuit area of the direct axis and the quadrature axis, so that the power density of the motor is improved. The curved slot 110 is embedded with the arc-shaped permanent magnet 200, and the arc-shaped permanent magnet 200 is also convenient for production and processing.
In one embodiment, the curved groove 110 includes a first mounting groove 111 and a second mounting groove 112, the first mounting groove 111 extends along a quadrature axis direction of the motor rotor 10, and the second mounting groove 112 and the first mounting groove 111 are symmetrical about a direct axis of the motor rotor 10; the curved slot 110 further includes a third mounting slot 113, and both ends of the third mounting slot 113 are respectively communicated with one ends of the first mounting slot 111 and the second mounting slot 112 adjacent to the rotor core 100.
Referring to fig. 5, the first mounting groove 111 and the second mounting groove 112 extend in different directions, and the first mounting groove 111 and the second mounting groove 112 are symmetrical with respect to a straight axis of the motor rotor 10, so as to improve uniformity of an armature restraining effect when the motor rotor 10 rotates in different directions, and also reduce a bounce that may occur when the rotation direction is switched. First mounting groove 111 and second mounting groove 112 imbed permanent magnet 200 respectively, and first mounting groove 111 and second mounting groove 112 shape rule are convenient for imbed permanent magnet 200, also are convenient for simultaneously the processing of permanent magnet 200. One end of the third mounting groove 113 is communicated with one end of the first mounting groove 111 near the rotor core 100, and the other end of the third mounting groove 113 is communicated with one end of the second mounting groove 112 near the rotor core 100. The permanent magnet 200 may not be embedded in the third mounting groove 113, or the permanent magnet 200 may be embedded in the third mounting groove 113, and the third mounting groove 113 may be filled with the permanent magnet 200, or a gap may be formed between the permanent magnet and both ends of the third mounting groove 113. The permanent magnet 200 fills the third mounting groove 113, the amount of the permanent magnet 200 increases, and the permanent magnet torque increases. A space is provided between the permanent magnet 200 and both ends of the third mounting groove 113, so that a greater torque density can be obtained.
In one embodiment, the third mounting groove 113 is arc-shaped or linear.
Referring to fig. 5, the third mounting groove 113 is arc-shaped, and the magnetic density distribution around the third mounting groove 113 is more uniform, thereby having the potential of further optimizing the design and increasing the torque density after the permanent magnet 200 is inserted. More permanent magnets 200 can be inserted into the arc-shaped third mounting groove 113, and the reluctance torque is fully utilized by adjusting the magnetic circuit areas of the straight shaft and the quadrature shaft, so that the power density of the motor is improved. The third mounting groove 113 is straight, which facilitates the grooving of the third mounting groove 113 and the processing of the permanent magnet 200 embedded therein.
In one embodiment, rotor core 100 is provided with 4-8 sets of magnetic barriers along its circumferential direction, and permanent magnets 200 in any two adjacent and any two opposite sets of magnetic barriers have opposite poles on the side close to the center of motor rotor 10.
Referring to fig. 1, a rotor 10 of an electric motor includes a rotor core 100 and a permanent magnet 200, the rotor core 100 is provided with a plurality of sets of magnetic barriers along a circumferential direction thereof, each set of magnetic barriers includes a curved groove 110 and a magnetic barrier hole 120, and the permanent magnet 200 is embedded in the curved groove 110. The magnetic barrier holes 120, the curved slots 110, and the permanent magnets 200 in the curved slots 110 form one set of magnetic pole units, the rotor core 100 is provided with 4-8 sets of magnetic pole units along its circumferential direction, and there are even-numbered sets of magnetic pole units, i.e., the rotor core 100 is provided with 4 or 6 or 8 sets of magnetic pole units along its circumferential direction. In the circumferential direction of the rotor core 100, the magnetic poles of any two sets of magnetic pole units facing each other on the side close to the center of the motor rotor 10 are opposite, and the magnetic poles of any two adjacent sets of magnetic pole units on the side close to the center of the motor rotor 10 are also opposite, so that all the magnetic pole units are arranged in the form of alternating N poles and S poles in the circumferential direction of the rotor.
The utility model also provides a motor, motor include electric motor rotor 10 and motor stator 20. The specific structure of the motor rotor 10 refers to the above-described embodiment. The motor stator 20 is sleeved on the periphery of the motor rotor 10, and the motor stator 20 includes a stator core 21 and a winding wound on the stator teeth 22.
Referring to fig. 8, the motor stator 20 includes a stator core 21 formed by laminating silicon steel plates and a winding directly wound on the stator teeth 22, the motor rotor 10 includes a rotor core 100 formed by laminating silicon steel plates, the rotor core 100 is provided with a plurality of groups of magnetic barriers along a circumferential direction thereof, each group of magnetic barriers includes a curved slot 110 and a plurality of magnetic barrier holes 120, two ends of the curved slot 110 extend toward an edge of the rotor core 100, and the magnetic barrier holes 120 are disposed between the curved slot 110 and the edge of the rotor core 100. The permanent magnets 200 are embedded in the curved slot 110, and when the permanent magnets 200 are embedded, the permanent magnets 200 in the same group are required to have the same polarity toward the outer peripheral direction of the motor rotor 10, and the adjacent groups of permanent magnets 200 are required to have opposite magnetism, and the multiple groups of permanent magnets 200 are alternately distributed along the circumferential direction of the rotor core 100 according to NS. The utility model discloses a motor can use in air condition compressor, electric motor car and fan system.
In one embodiment, the thickness of the motor rotor 10 in the axial direction thereof is equal to or greater than the thickness of the motor stator 20 in the axial direction thereof.
The motor rotor 10 includes a rotor core 100 formed by laminating silicon steel plates, and a thickness of the motor rotor 10 in an axial direction thereof is a thickness in which a plurality of layers of the silicon steel plates are laminated together. Similarly, the motor stator 20 includes a stator core 21 formed by laminating silicon steel plates, and the thickness of the motor stator 20 along the axial direction is the thickness of the multiple layers of silicon steel plates stacked together. The thickness that motor rotor 10 multilayer silicon steel sheet stack together is more than or equal to motor stator 20 multilayer silicon steel sheet stack together thickness, and then the volume (volume) of placing permanent magnet 200 can be big, and the magnetic flux that motor rotor 10 produced can increase to motor permanent magnet torque has been improved, the output capacity of motor has been improved, has improved the motor performance.
Referring to fig. 9, it is verified from the experimental results that as the ratio of the thickness of the motor rotor 10 in the axial direction thereof to the thickness of the motor stator 20 in the axial direction thereof increases, the flux linkage and the inductance difference of the motor rotor 10 also increase. When the ratio is greater than or equal to 1, the flux linkage of the motor rotor 10 is greater than 190mwb, and the inductance difference of the motor rotor 10 is greater than 14mH. Therefore, when the thickness of the motor rotor 10 in the axial direction thereof is greater than or equal to the thickness of the motor stator 20 in the axial direction thereof, the magnetic flux generated by the motor rotor 10 is increased, thereby improving the motor permanent magnet torque, improving the output capability of the motor, and improving the motor performance.
The utility model discloses still provide a compressor, this compressor includes the motor, and the concrete structure of this compressor refers to above-mentioned embodiment, because this compressor has adopted the whole technical scheme of above-mentioned all embodiments, consequently has all beneficial effects that the technical scheme of above-mentioned embodiment brought at least, and the repeated description is no longer given here.
The above is only the optional embodiment of the present invention, and not therefore the patent scope of the present invention is limited, all under the idea of the present invention, the equivalent structure transformation made by the contents of the specification and the attached drawings is utilized, or the direct/indirect application is included in other related technical fields in the patent protection scope of the present invention.
Claims (16)
1. An electric machine rotor, comprising:
the magnetic barrier structure comprises a rotor core, wherein a plurality of groups of magnetic barriers are arranged on the rotor core along the circumferential direction of the rotor core, each group of magnetic barriers comprises a curved slot, two ends of the curved slot extend towards the edge of the rotor core, a plurality of magnetic barrier holes are arranged between the inner slot wall of the curved slot and the edge of the rotor core, and the plurality of magnetic barrier holes are arranged at intervals along the extending direction of the inner slot wall of the curved slot and form at least one layer of magnetic barrier hole layer;
the permanent magnet is embedded into the curved groove;
the thickness of the permanent magnet in the direction of a straight shaft of the motor rotor is T, the distance from one side far away from the curved groove to the other side close to the curved groove of the magnetic barrier hole in a single layer is the thickness of the magnetic barrier hole, the sum of the thicknesses of the magnetic barrier holes in each layer is G, and G and T meet the following requirements: G/T is not more than 1 and not less than 0.1.
2. An electric machine rotor according to claim 1, characterized in that 2-6 said barrier holes are provided between the inner wall of said curved slot and the edge of said rotor core, said barrier holes being spaced apart in the direction of extension of the inner wall of said curved slot and forming a layer of said barrier holes.
3. The electric machine rotor as recited in claim 2, wherein the flux barrier layer includes four of the flux barrier holes.
4. The electric machine rotor as recited in claim 2, wherein the magnetic barrier holes have a thickness g, and g and T satisfy: g/T is not more than 1 and not less than 0.1.
5. The electric machine rotor of claim 1, wherein the plurality of magnetic barrier layers form two layers of the magnetic barrier layers, the magnetic barrier layers comprising a first magnetic barrier layer and a second magnetic barrier layer, the first magnetic barrier layer formed between the second magnetic barrier layer and the curved slot.
6. The electric machine rotor of claim 5, wherein the first layer of magnetic barrier holes has a thickness g 1 The thickness of the second magnetic barrier layer is g 2 ，g 1 、g 2 And T satisfies: (g) 1 +g 2 ) the/T is not more than 1 and not less than 0.1.
7. The electric machine rotor as recited in claim 1, wherein the flux barrier holes have a trapezoidal shape with rounded corners.
8. The electric machine rotor as claimed in claim 1, wherein, in a cross section perpendicular to an axial direction of the electric machine rotor, a minimum width of both ends of the permanent magnet is E, and T and E satisfy: t is not less than E.
9. The electric machine rotor as recited in claim 1, wherein a gap is formed between both ends of the curved slot and the permanent magnet.
10. An electric machine rotor as claimed in claim 9, characterised in that said gaps are filled with a non-magnetically conductive medium.
11. An electric machine rotor as recited in claim 1, wherein the curved slot is arcuate.
12. The motor rotor of claim 1, wherein the curved groove includes a first mounting groove extending in a quadrature axis direction of the motor rotor and a second mounting groove symmetrical to the first mounting groove about a direct axis of the motor rotor; the curved groove further comprises a third mounting groove, and two ends of the third mounting groove are communicated with one ends, close to the rotor core, of the first mounting groove and the second mounting groove respectively.
13. The electric motor rotor as recited in claim 12, wherein the third mounting slot is arcuate or linear.
14. An electric machine rotor as recited in claim 1, wherein said rotor core is provided with 4-8 sets of said magnetic barriers along a circumferential direction thereof, and said permanent magnets in any adjacent and any opposing two sets of said magnetic barriers are opposite in magnetic pole on a side close to a center of said electric machine rotor.
15. An electric machine comprising an electric machine rotor according to any one of claims 1 to 14, and further comprising an electric machine stator fitted around the outer periphery of the electric machine rotor, the electric machine stator comprising a stator core and windings wound around stator teeth.
16. A compressor, comprising the motor of claim 15.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222722724.XU CN218633493U (en) | 2022-10-14 | 2022-10-14 | Motor rotor, motor and compressor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222722724.XU CN218633493U (en) | 2022-10-14 | 2022-10-14 | Motor rotor, motor and compressor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024078131A1 (en) * | 2022-10-14 | 2024-04-18 | 广东美芝制冷设备有限公司 | Rotor having magnetic barriers, motor and compressor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024078131A1 (en) * | 2022-10-14 | 2024-04-18 | 广东美芝制冷设备有限公司 | Rotor having magnetic barriers, motor and compressor |
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