CN218633492U - Motor rotor, motor and compressor - Google Patents
Motor rotor, motor and compressor Download PDFInfo
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- CN218633492U CN218633492U CN202222722722.0U CN202222722722U CN218633492U CN 218633492 U CN218633492 U CN 218633492U CN 202222722722 U CN202222722722 U CN 202222722722U CN 218633492 U CN218633492 U CN 218633492U
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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, 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; 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 length and the width of the permanent magnet are optimally adjusted, so that the magnetic field intensity in the air around the permanent magnet can be effectively increased, and the air gap flux density of the permanent magnet is increased, namely, the permanent magnet flux in the direction of a direct axis and a quadrature axis 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 magnets (ferrite or bonded neodymium iron boron) can be inserted into the rotor magnetic barriers for auxiliary excitation, so that the excitation component of the motor current can be reduced and 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 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, wider application of the 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.
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 shield 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 each curved groove extend towards the edge of the rotor core, a plurality of magnetic barrier holes are formed between the inner groove wall of each curved groove 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 groove wall of each curved groove;
the permanent magnet is embedded into the curved groove;
in a section perpendicular to the axial direction of the motor rotor, the permanent magnet comprises a first side edge and a second side edge which are opposite, and the first side edge is far away from the center of the rotor core; the linear distance between two end points of the first side is the length L of the permanent magnet 1 The distance from the intersection point of the second side edge and the straight shaft of the motor rotor to the first side edge is the width H of the permanent magnet 1 ，L 1 And H 1 Satisfies the following conditions: h 1 /L 1 Not less than 1/11.
In one embodiment, a minimum absolute distance of hole angles of two of the barrier holes near an edge of the rotor core is L 2 The distance from a connecting line of two hole angles with the minimum absolute spacing of two barrier holes close to the center of the rotor core to a connecting line of two hole angles with the minimum absolute spacing of two barrier holes close to the edge of the rotor core is H 2 ，L 2 And H 2 Satisfies the following conditions: h 2 /L 2 Not less than 1/11.
In one embodiment, the thickness of the permanent magnet in the direction of the straight axis of the motor rotor is T; the magnetic barrier hole is provided with a third side edge and a fourth side edge which are opposite, the third side edge is far away from the center of the rotor core, and the distance from the third side edge to the fourth side edge is the thickness G of the magnetic barrier hole; t and G satisfy: t is not less than G.
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, the third side and/or the fourth side are linear;
or, the third side and/or the fourth side are arc-shaped.
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-magnetically 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, the motor includes electric motor rotor, electric motor rotor includes:
the magnetic shield 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 each curved groove extend towards the edge of the rotor core, a plurality of magnetic barrier holes are formed between the inner groove wall of each curved groove 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 groove wall of each curved groove;
the permanent magnet is embedded into the curved groove;
in a section perpendicular to the axial direction of the motor rotor, the permanent magnet comprises a first side edge and a second side edge which are opposite, and the first side edge is far away from the center of the rotor core; the linear distance between the two end points of the first side is the length L of the permanent magnet 1 The distance from the intersection point of the second side edge and the straight shaft of the motor rotor to the first side edge is the width H of the permanent magnet 1 ，L 1 And H 1 Satisfies the following conditions: h 1 /L 1 Not less than 1/11;
the motor also comprises a motor stator, wherein 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 stator teeth.
In one embodiment, the thickness of the motor rotor in the axial direction thereof is equal to or greater than the thickness of the motor stator in the axial direction thereof.
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. At the same time, the length L of the permanent magnet 1 And width H 1 The optimized adjustment is carried out, the magnetic field intensity in the air around the permanent magnet can be effectively increased, and the air gap flux density of the permanent magnet is increased, namely, the permanent magnet flux in the direction of the direct axis and the quadrature axis of the motor rotor is effectively increased, so that the output torque of the motor rotor is 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 needed to be used in the description of the embodiments or the prior art 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 an enlarged view taken at A in FIG. 1;
FIG. 4 is a schematic structural view of another embodiment of a rotor of an electric machine;
FIG. 5 is a schematic diagram showing the relationship between H1/L1 of the motor rotor and the output torque of the motor;
FIG. 6 is a diagram illustrating the relationship between H2/L2 and the inductance difference of the motor rotor;
FIG. 7 is a schematic view of the stator structure of the motor;
fig. 8 is a diagram illustrating 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 | |
| 210 | The |
200 | |
| 220 | |
110 | |
| 121 | |
120 | |
| 122 | The |
112 | |
| 111 | |
113 | |
| 20 | |
22 | |
| 21 | Stator core |
The realization, the functional characteristics and the advantages of the utility model are further explained by combining the embodiment and referring to the attached drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the 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 in the present invention, all other embodiments obtained by a person skilled in the art without 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 of the 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 to each other or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The synchronous reluctance motor has 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 magnets (ferrite or bonded neodymium iron boron) can be inserted into the rotor magnetic barriers for auxiliary excitation, so that the excitation component of the motor current can be reduced and 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 magnetic flux of the permanent magnet 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, 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.
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. At the same time, the length L of the permanent magnet 1 And width H 1 The optimized adjustment is carried out, the magnetic field intensity in the air around the permanent magnet can be effectively increased, and the air gap flux density of the permanent magnet is increased, namely, the permanent magnet flux in the direction of the direct axis and the quadrature axis of the motor rotor is effectively increased, so that the output torque of the motor rotor is increased, and the performance of the motor rotor is improved.
Referring to fig. 1 to 4, the present invention provides a motor rotor 10, including a rotor core 100 and a permanent magnet 200, wherein the rotor core 100 is provided with a plurality of groups of magnetic barriers along a circumferential direction thereof, and each group of magnetic barriers is provided with a plurality of groups of magnetic barriersThe magnetic barrier comprises a curved slot 110, two ends of the curved slot 110 extend towards the edge of the rotor core 100, a plurality of magnetic barrier holes 120 are arranged between the inner slot wall of the curved slot 110 and the edge of the rotor core 100, and the plurality of magnetic barrier holes 120 are arranged at intervals along the extension direction of the inner slot wall of the curved slot 110; the permanent magnet 200 is embedded in the curved slot 110; in a cross section perpendicular to the axial direction of the motor rotor 10, the permanent magnet 200 includes a first side 210 and a second side 220 opposite to each other, and the first side 210 is far away from the center of the rotor core 100; the linear distance between the two end points of the first side 210 is the length L of the permanent magnet 200 1 The distance from the intersection point of the second side 220 and the straight axis of the motor rotor 10 to the first side 210 is the width H of the permanent magnet 200 1 ，L 1 And H 1 Satisfies the following conditions: h 1 /L 1 Not less than 1/11.
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 materials or silicon steel punching sheets, has high magnetic permeability and high structural strength, and is convenient to process.
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)idiq+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 d-axis and q-axis directions, 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 psi 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. By adopting the method, the efficiency of the motor can be improved, and the method for improving the efficiency of the motor 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 flux barrier holes 120 are formed between an inner wall of the curved slot 110 and an edge of the rotor core 100, the plurality of flux barrier holes 120 are spaced apart from each other in an extending direction of the inner wall of the curved slot 110, and the flux barrier holes 120 may be filled with air or a non-magnetic conductive medium. 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 achieved, 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 disposed 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.
Referring to fig. 2, further, in a cross section perpendicular to the axial direction of the motor rotor 10, the permanent magnet 200 includes a first side 210 and a second side 220 opposite to each other, and the first side 210 is far from the center of the rotor core 100. Length L of permanent magnet 200 1 Is the linear distance between the two end points of the first side 210 of the permanent magnet 200, the width H of the permanent magnet 200 1 Is the distance from the intersection of the second side 220 of the permanent magnet 200 and the straight axis of the motor rotor 10 to the first side 210. By the length L of the permanent magnet 200 1 And width H 1 Performing adjustment optimization when H is 1 /L 1 When the flux density is not less than 1/11, the air gap flux density of the permanent magnet 200 (the air gap flux density refers to the strength of magnetic strength in the air, and the larger the air gap flux density is, the larger the magnetic field strength is, and the larger the torque of the permanent magnet 200) can be effectively increased, that is, the permanent magnet flux in the directions of the d axis and the q axis of the motor rotor 10 can be effectively increased, so that the utilization rate of the permanent magnet 200 can be improved and the performance of the motor rotor 10 can be improved on the premise of not increasing the use amount of the permanent magnet 200.
Referring to fig. 5, the experimental results prove that the length L of the permanent magnet 200 is increased 1 And width H 1 The adjustment optimization is carried out, and the permanent magnet torque of the motor rotor 10 follows with H 1 /L 1 Is increased when H is increased 1 /L 1 When the torque is larger than 1/11, the output torque of the motor rotor 10 is larger than 10NM. And the output torque of the motor rotor 10 is at H 1 /L 1 Gradually becomes gentle after more than 1/11. It is understood that when H 1 /L 1 When the magnetic flux density is larger than 1/11, the air gap magnetic density of the permanent magnet 200 can be effectively increased, namely, the permanent magnet magnetic flux in the d-axis and q-axis directions of the motor rotor 10 can be effectively increased, so that the permanent magnet torque of the motor rotor 10 is improved.
The technical scheme of the utility model is through setting up curved groove 110 and magnetic barrier hole 120 on electric motor rotor 10 to imbed permanent magnet 200 in curved groove 110. Because only one layer of permanent magnet 200 is arranged on the motor rotor 10, the using amount of the permanent magnet 200 is greatly reduced, the production cost is reduced, and the production takt of the motor is improved. At the same time, for the length L of the permanent magnet 200 1 And width H 1 The optimized adjustment is carried out, so that the circumference of the permanent magnet 200 can be effectively increasedThe magnetic field intensity in the air increases the air gap flux density of the permanent magnet 200, that is, the permanent magnet flux in the direction of the direct axis and the quadrature axis of the motor rotor 10 is effectively increased, thereby improving the performance of the motor rotor 10.
In one embodiment, a minimum absolute distance of hole angles of two barrier holes 120 near an edge of rotor core 100 is L 2 A distance H from a line connecting two hole angles at which two barrier holes 120 near the center of rotor core 100 have the minimum absolute distance to a line connecting two hole angles at which two barrier holes 120 near the edge of rotor core 100 have the minimum absolute distance 2 ，L 2 And H 2 Satisfies the following conditions: h 2 /L 2 Not less than 1/11.
Referring to fig. 1 and 3, a plurality of barrier holes 120 are spaced apart from each other in an extending direction of an inner wall of a curved slot 110, head and tail barrier holes 120 are close to an edge of a rotor core 100, and among angles close to the edge of the rotor core 100, the angles of the two barrier holes 120 have a minimum absolute distance L 2 And the extension line of the connecting line of the two hole angles is M 1 . Wherein two barrier holes 120 are formed near the center of the rotor core 100, and an extension line of a line connecting two hole angles having the smallest absolute distance among hole angles near the center of the rotor core 100 is M 2 From the extension line M 1 To extension line M 2 A distance of H 2 . From the analysis of an ideal magnetic isolation angle, the d-axis magnetomotive force and the q-axis magnetomotive force of the motor rotor 10 are both in sine distribution. In order to ensure that the magnetic density of the permanent magnet 200 is uniformly distributed and avoid local saturation, the size of the magnetic barrier hole 120 should follow the principle of magnetomotive force distribution. By adjusting and optimizing the overall size of the plurality of magnetic barrier holes 120 when the H is less than H 2 /L 2 When the ratio is not less than 1/11, the salient pole ratio can be increased, the influence of the saturation effect is effectively reduced, the inductance difference value of the motor rotor 10 is effectively increased, and the performance of the motor rotor 10 is improved.
Referring to fig. 6, according to the experimental results, it is verified that the inductance difference of the motor rotor 10 is determined by adjusting and optimizing the overall size of the plurality of magnetic barrier holes 120 according to H 2 /L 2 Is increased when H is increased 2 /L 2 When the inductance difference is larger than 1/11, the inductance difference of the motor rotor 10 isH 2 /L 2 1/11 before the inflection point appears, and is at H 2 /L 2 Gradually becomes gentle after more than 1/11. It is understood that when H is 2 /L 2 When the inductance difference is larger than 1/11, the inductance difference of the motor rotor 10 is improved, so that the output torque of the motor rotor 10 is increased, and the performance of the motor rotor 10 is effectively improved.
In one embodiment, the permanent magnet 200 has a thickness T in the direction of the straight axis of the motor rotor 10; the magnetic barrier hole 120 has a third side 121 and a fourth side 122 opposite to each other, the third side 121 is far from the center of the rotor core 100, and the distance from the third side 121 to the fourth side 122 is the thickness G of the magnetic barrier hole 120; t and G satisfy: t is not less than G.
Referring to fig. 1 and 2, in order to ensure that the magnetic flux 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. When the thickness T of the permanent magnet 200 and the thickness G of the magnetic barrier hole 120 are adjusted, the following conditions are satisfied: when T is not less than G, 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, 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. 1 and 2, the magnetic leakage effect of the permanent magnet 200 in the direction close to the straight axis 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, the third side 121 and/or the fourth side 122 are linear;
alternatively, the third side 121 and/or the fourth side 122 are curved.
Referring to fig. 1 and 3, a plurality of magnetic barrier holes 120 are disposed at intervals along an extending direction of an inner groove wall of the curved groove 110, each magnetic barrier hole 120 has a third side 121 and a fourth side 122 opposite to each other, and the third side 121 and the fourth side 122 extend along the extending direction of the curved groove 110. When the magnetic barrier hole 120 is provided, the third side 121 and the fourth side 122 may be linear, or one of the third side 121 and the fourth side 122 may be linear, and the other may be in other shapes; the third side 121 and the fourth side 122 may be arc-shaped, or one of the third side 121 and the fourth side 122 may be arc-shaped, and the other side may be in other shapes. And are not intended to be limiting herein. The magnetic barrier hole 120 further includes two other sides connecting both ends of the third and fourth sides 121 and 122, and the two other sides have an arc-shaped profile at the connection with both ends of the third and fourth sides 121 and 122 to facilitate the passage of the magnetic circuit.
In one embodiment, a gap is formed between both ends of the curved groove 110 and the permanent magnet 200.
Referring to fig. 1, 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 then returns to the motor stator along the q-axis, and all the processes generate the demagnetization effect on the end portion 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-magnetically conductive medium.
In order to avoid the demagnetization 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, the curved slot 110 is formed in an arc shape, so that the magnetic density distribution uniformity of the rotor core 100 is better, 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 permanent magnet 200, and the arc 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 near the rotor core 100.
Referring to fig. 4, 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 close to 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 close to 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. 4, 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 direct axis and the quadrature axis, so that the power density of the motor is improved. The third mounting groove 113 is linear, 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 machine includes 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 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 is an even number of 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 outer periphery of the motor rotor 10, and the motor stator 20 comprises a stator core 21 and a winding wound on the stator teeth 22.
Referring to fig. 7, 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 slots 110, and when the permanent magnets 200 are embedded, the permanent magnets 200 in the same group are required to have the same polarity in the peripheral direction of the motor rotor 10, and the adjacent groups of permanent magnets 200 are required to have opposite magnetism, and the 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. 8, 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 permanent magnet torque of the motor, improving the output capability of the motor, and improving the performance of the motor.
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 all 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 repeated here one by one.
The above is only the optional embodiment of the present invention, and not therefore the limit to the patent scope of the present invention, all the concepts of the present invention utilize the equivalent structure transformation of the content of the specification and the attached drawings, or the direct/indirect application in other related technical fields is included in the patent protection scope of the present invention.
Claims (14)
1. An electric machine rotor, comprising:
the magnetic shield 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 each curved groove extend towards the edge of the rotor core, a plurality of magnetic barrier holes are formed between the inner groove wall of each curved groove 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 groove wall of each curved groove;
the permanent magnet is embedded into the curved groove;
in a section perpendicular to the axial direction of the motor rotor, the permanent magnet comprises a first side edge and a second side edge which are opposite, and the first side edge is far away from the center of the rotor core; the linear distance between two end points of the first side is the length L of the permanent magnet 1 The distance from the intersection point of the second side edge and the straight shaft of the motor rotor to the first side edge is the width H of the permanent magnet 1 ，L 1 And H 1 Satisfies the following conditions: h 1 /L 1 Not less than 1/11.
2. The electric machine rotor of claim 1, wherein a minimum absolute distance of hole angles of two of the barrier holes near an edge of the rotor core is L 2 The distance from a connecting line of two hole angles with the minimum absolute spacing of two barrier holes close to the center of the rotor core to a connecting line of two hole angles with the minimum absolute spacing of two barrier holes close to the edge of the rotor core is H 2 ，L 2 And H 2 Satisfies the following conditions: h 2 /L 2 Not less than 1/11.
3. The electric machine rotor as recited in claim 1, wherein the permanent magnets have a thickness T in a direction of a straight axis of the electric machine rotor; the magnetic barrier hole is provided with a third side edge and a fourth side edge which are opposite, the third side edge is far away from the center of the rotor core, and the distance from the third side edge to the fourth side edge is the thickness G of the magnetic barrier hole; t and G satisfy: t is not less than G.
4. The electric machine rotor as claimed in claim 3, wherein, in a cross section perpendicular to the axial direction of the electric machine rotor, the minimum width of both ends of the permanent magnet is E, and T and E satisfy: t is not less than E.
5. An electric machine rotor according to claim 3, characterised in that the third side and/or the fourth side are rectilinear;
or, the third side and/or the fourth side is arc-shaped.
6. 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.
7. An electric machine rotor as claimed in claim 6, wherein said voids are filled with a non-magnetically permeable medium.
8. The electric machine rotor as recited in claim 1, wherein the curved slot is arcuate.
9. 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 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.
10. The electric motor rotor as claimed in claim 9, wherein the third mounting groove is arc-shaped or linear.
11. 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.
12. An electric machine comprising an electric machine rotor according to any one of claims 1 to 11, 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.
13. The motor of claim 12, wherein a thickness of the motor rotor in an axial direction thereof is equal to or greater than a thickness of the motor stator in the axial direction thereof.
14. A compressor, characterized in that it comprises an electric machine according to any one of claims 12-13.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222722722.0U CN218633492U (en) | 2022-10-14 | 2022-10-14 | Motor rotor, motor and compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222722722.0U CN218633492U (en) | 2022-10-14 | 2022-10-14 | Motor rotor, motor and compressor |
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| Publication Number | Publication Date |
|---|---|
| CN218633492U true CN218633492U (en) | 2023-03-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222722722.0U Active CN218633492U (en) | 2022-10-14 | 2022-10-14 | Motor rotor, motor and compressor |
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| Country | Link |
|---|---|
| CN (1) | CN218633492U (en) |
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2022
- 2022-10-14 CN CN202222722722.0U patent/CN218633492U/en active Active
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