CN210167872U - Rotor, motor, compressor and refrigeration plant - Google Patents

Abstract

The utility model provides a rotor, motor, compressor and refrigeration plant. Wherein, the rotor includes: the rotor iron core is provided with a mounting groove; the permanent magnet is arranged in the mounting groove and forms a magnetic pole; the peripheral surface of the rotor core between the adjacent d shaft and q shaft sequentially comprises a first arc section, a concave section, a convex section and a second arc section which are connected along the circumferential direction; the circle center of the first arc section is positioned on the axis of the rotor core, and the first arc section is intersected with the d axis; the q axis is intersected with the second arc section and passes through the circle center of the second arc section; the radius of the first arc section is larger than the distance from any point on the concave section, the convex section and the second arc section to the axis of the rotor core; the center line of any magnetic pole passing through the axis of the rotor core is defined as a d-axis, and the angular bisector of two adjacent d-axes is defined as a q-axis. The utility model discloses a rotor can effectively improve the armature iron loss of motor, reduces the vibration noise of motor, promotes the operation efficiency of motor.

Description

Rotor, motor, compressor and refrigeration plant

Technical Field

The utility model relates to a compressor technical field particularly, relates to a rotor, motor, compressor and refrigeration plant.

Background

Because of its higher efficiency, the permanent magnet synchronous motor is widely applied to the field of household appliances such as air-conditioning compressors. However, the air gap flux density harmonic wave is large when the existing permanent magnet synchronous motor operates, which causes the operation noise of the motor to be large.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving at least one of the technical problem that exists among prior art or the correlation technique

To this end, a first aspect of the present invention proposes a rotor.

A second aspect of the present invention provides an electric machine.

A third aspect of the present invention provides a compressor.

A fourth aspect of the present invention provides a refrigeration apparatus.

In view of this, a first aspect of the present invention provides a rotor, including: the rotor iron core is provided with a mounting groove; the permanent magnet is arranged in the mounting groove and forms a magnetic pole; the peripheral surface of the rotor core between the adjacent d shaft and q shaft sequentially comprises a first arc section, a concave section, a convex section and a second arc section which are connected along the circumferential direction; the circle center of the first arc section is positioned on the axis of the rotor core, and the first arc section is intersected with the d axis; the q axis is intersected with the second arc section and passes through the circle center of the second arc section; the radius of the first arc section is larger than the distance from any point on the concave section, the convex section and the second arc section to the axis of the rotor core; the center line of any magnetic pole passing through the axis of the rotor core is defined as a d-axis, and the angular bisector of two adjacent d-axes is defined as a q-axis.

The utility model provides a pair of rotor includes rotor core and permanent magnet. The rotor core is provided with a mounting groove, the permanent magnet is arranged in the mounting groove and forms a magnetic pole, a d axis is set as a center line of any magnetic pole passing through the axis center of the rotor core, an axis where an angular bisector of two adjacent d axes is located is defined as a q axis, and the outer peripheral surface of the rotor core between the adjacent d axis and the q axis sequentially comprises a first arc section, a concave section, a convex section and a second arc section which are connected along the circumferential direction, wherein the radius of the first arc section is larger than the distance from any point on the concave section, the convex section and the second arc section to the axis of the rotor core, namely, the distance from the first arc section to the axis of the rotor core in the outer peripheral surface of the rotor core between the adjacent d axis and the q axis is the largest. The outer peripheral face of rotor core passes through to sunken section, protruding section and second circular arc section in proper order by first circular arc section, and promptly, the outward flange of the cross section of rotor core perpendicular to rotor core's axis is the non-whole circle structure. The structure arrangement can effectively improve the armature iron loss of the motor using the rotor, reduce the vibration noise of the motor, reduce the air gap flux density harmonic wave, and simultaneously improve the counter electromotive force waveform of the motor and improve the operation energy efficiency of the motor.

According to the utility model discloses foretell rotor can also have following additional technical characterstic:

in the above technical solution, preferably, the concave section includes a third arc section and a fourth arc section, and the convex section includes a fifth arc section along the circumferential direction of the rotor core; the centre of a circle of third circular arc section and fifth circular arc section all is located rotor core's axis, and the radius r1 of radius r1, the radius r2 of third circular arc section, the radius r3 of fourth circular arc section and the radius r4 of fifth circular arc section of first circular arc section satisfy: r3 is more than r4 and less than or equal to r2 and less than r 1; the distance d1 from one end of the first arc segment departing from the d-axis to the d-axis and the distance d2 from one end of the third arc segment departing from the d-axis to the d-axis satisfy: 0.75 < d1/d2 < 0.95.

In the technical scheme, the concave section comprises a third arc section and a fourth arc section, and the convex section comprises a fifth arc section by further limiting the composition of the concave section and the convex section. Wherein, the distance d1 from one end of the first arc segment departing from the d axis to the d axis and the distance d2 from one end of the third arc segment departing from the d axis to the d axis satisfy: d1/d2 is more than 0.75 and less than 0.95, thereby being beneficial to reducing the loss of magnetic flux, improving the efficiency of the motor and improving the service performance of the motor. In addition, the radius r1 of the first circular arc segment, the radius r2 of the third circular arc segment, the radius r3 of the fourth circular arc segment and the radius r4 of the fifth circular arc segment satisfy: r3 is more than r4 and less than or equal to r2 is more than r1, the air gap magnetic field waveform can be improved, the armature iron loss can be effectively reduced, the energy efficiency of the motor is improved, meanwhile, the back electromotive force waveform of the motor can be improved, and the running noise of the motor is reduced.

In any of the above technical solutions, preferably, the radius r1 of the first circular arc segment and the radius r2 of the third circular arc segment satisfy: 0.9 < r2/r1 < 0.98.

In the technical scheme, the ratio relation between the radius r1 of the first circular arc section and the radius r2 of the third circular arc section is reasonably limited to meet the requirements that r2/r1 is more than 0.9 and less than 0.98, so that the use requirements of high energy efficiency and low noise during the operation of the motor are considered and balanced by utilizing the shape difference of the first circular arc section and the third circular arc section. If r2/r1 is less than or equal to 0.9, the energy efficiency of the motor during operation is low, the service performance of the product is poor, and if r2/r1 is greater than or equal to 0.98, the counter potential waveform of the motor is poor, and the operation noise of the motor is large.

In any of the above technical solutions, preferably, the radius r1 of the first circular arc segment and the radius r3 of the fourth circular arc segment satisfy: r3/r1 is more than 0.5 and less than 0.7.

In the technical scheme, the first circular arc segment and the fourth circular arc segment are not concentric, so that the ratio relation between the radius r1 of the first circular arc segment and the radius r3 of the fourth circular arc segment is reasonably limited, and the requirement that the ratio is 0.5 < r3/r1 < 0.7 is met. Therefore, the shape difference of the first arc section and the fourth arc section is utilized to meet the use requirements of high energy efficiency and low noise when the motor operates in consideration and balance, and the structure is favorable for reducing the loss of magnetic flux, improving the efficiency of the motor and improving the use performance of the motor.

In any of the above solutions, preferably, the permanent magnets are configured as V-shaped or W-shaped, the permanent magnets are distributed in mirror image with the d-axis as the symmetry axis, and the openings of the V-shaped or W-shaped are away from the axis of the rotor core.

In this technical scheme, through the shape structure of rationally injecing the permanent magnet for the permanent magnet is constructed for V type or W type, and the magnetism effect of gathering that V type or W type permanent magnet produced is favorable to promoting the motor back electromotive force, and then is favorable to promoting the low frequency energy efficiency of the compressor that uses this rotor, and it can be understood that the permanent magnet also can be for satisfying the permanent magnet of other shapes of requirement.

In any of the above technical solutions, preferably, the rotor further includes: the slit is arranged on the rotor core between the adjacent d shaft and q shaft and is positioned on one side, away from the axis of the rotor core, of the mounting groove; wherein the slit is obliquely arranged relative to the mounting groove.

In this technical scheme, the rotor still includes the slit, and the slit is located the rotor core between adjacent d axle and q axle, and the slit is located the mounting groove and keeps away from one side of the axis of rotor core, and the slit sets up for the mounting groove slope. The slit is arranged relative to the structure of the mounting groove, so that the influence of an armature magnetic field of the motor on a main magnetic field of a rotor can be reduced, the load magnetic density of the motor is improved, the air gap magnetic density waveform of the motor is optimized, the radial force of the motor is improved, and the running noise of the motor is reduced.

In any of the above technical solutions, preferably, the number of the slits is plural, the plural slits include at least a first slit and a second slit, and the first slit is located between the second slit and the d-axis; the included angle a1 of the two first slits which are distributed in a mirror image mode by taking the d axis as the symmetry axis satisfies the following conditions: a1 is more than or equal to 30 degrees and less than or equal to 50 degrees; the included angle a2 of the two second slits which are distributed in a mirror image mode by taking the d axis as the symmetry axis satisfies the following conditions: a2 is more than or equal to 30 degrees and less than or equal to 50 degrees.

In this embodiment, the plurality of slits include different kinds of slits, for example, the plurality of slits include at least a first slit and a second slit, and the first slit is located between the second slit and the d-axis. Thus, the included angle a1 of the two first slits which are distributed in a mirror image mode by taking the d axis as the symmetry axis satisfies the following conditions: a1 is more than or equal to 30 degrees and less than or equal to 50 degrees, and the value range of the included angle of the two first slits is limited, so that the cogging torque and the torque pulsation can be reduced, and the noise is improved. Meanwhile, the value range of the included angle a2 of the two second slits is limited to meet the requirement that a2 is more than or equal to 30 degrees and less than or equal to 50 degrees, so that the cogging torque and the torque pulsation can be reduced, and the noise is improved.

In any of the above technical solutions, preferably, the included angle a1 and the included angle a2 satisfy: a1 < a 2.

In this technical scheme, through the value range of rationally injecing contained angle a1 and contained angle a2 for contained angle a1 and contained angle a2 satisfy: a1 is less than a2, on one hand, the smoothness of a part of magnetic circuits near a q axis can be ensured, the increase of the proportion of reluctance torque of the motor is facilitated, and further the high-rotating-speed reliable operation of the high-power motor is facilitated, on the other hand, the reduction of magnetic flux can be reduced, the manufacturing cost is facilitated to be saved, and the cost performance of the motor is improved.

In any of the above technical solutions, preferably, the length of the first slit is greater than the length of the second slit.

In the technical scheme, the arrangement position relationship between the mounting groove and the slits is limited, so that the area of the region for arranging the slits of the rotor core is smaller as the part of the rotor core between the adjacent d-axis and q-axis is closer to the outer peripheral surface of the rotor core, and therefore, the length of the first slit is larger than that of the second slit by limiting the lengths of the first slit and the second slit, the reasonable layout of the slits is facilitated, and the effect of improving noise is achieved while the cogging torque and the torque ripple can be reduced.

A second aspect of the present invention provides a motor, including: the rotor of any one of the aspects of the first aspect; and the stator core is arranged on the outer side of the rotor in a surrounding manner.

The utility model provides a motor, because of including as in any one of the first aspect rotor, consequently have the whole beneficial effect of above-mentioned rotor, do not make the statement one by one here.

Preferably, the motor is a permanent magnet synchronous motor, and the motor provided by the application has the characteristics of high energy efficiency, high power density and low noise.

In the above technical solution, preferably, the stator core is provided with a stator body and a plurality of teeth, the plurality of teeth are arranged on an inner side wall of the stator body facing the rotor, and two adjacent teeth define a stator slot; the coil of the motor is wound on the tooth part; the number of the stator slots is Z, the number of pole pairs of the rotor is P, and Z/2P is 9/6 or 12/8.

In this technical solution, the stator core includes a stator body and a plurality of teeth portions. A stator slot is defined between the adjacent tooth parts, coils are wound on the tooth parts, and the stator core is arranged outside the rotor in a surrounding mode. By defining the proportional relation between the number Z of the stator slots and the pole pair number P of the rotor, Z/2P is 9/6 or 12/8, namely, the pole slot matching of the motor is defined. When the number of pole pairs of the rotor is P, the number of pole pairs of the rotor is 2P, that is, the motor can be a 6-pole 9-slot motor or an 8-pole 12-slot motor. Of course, a 10-pole 12-slot motor or a 4-pole 6-slot motor is also possible, but this is not an example. The motor of the type can effectively reduce armature iron loss, promote magnetic flux and further promote motor efficiency.

The third aspect of the present invention provides a compressor, including: the rotor of any one of the aspects of the first aspect; or the motor according to any of the above aspects.

The utility model provides a compressor, because include according to the rotor of any one of first aspect, or the motor of any technical scheme in the second aspect, consequently have the whole beneficial effect of above-mentioned rotor or motor, do not state one by one here.

A fourth aspect of the present invention provides a refrigeration apparatus, including: the rotor of any one of the aspects of the first aspect; or the electric machine of any of the embodiments of the second aspect; or the compressor of any of the preceding claims.

The utility model provides a refrigeration plant, because of including as in any one of the first aspect rotor, or any one technical scheme in the second aspect motor, or any one technical scheme in the third aspect compressor. Therefore, the rotor or the motor or the compressor has all the advantages, which are not described herein.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 shows a schematic structural view of a rotor of an embodiment of the invention;

FIG. 2 is an enlarged view of a portion of the embodiment of FIG. 1 at A;

fig. 3 shows a schematic structural view of a rotor and a stator core according to an embodiment of the present invention.

Wherein, the correspondence between the reference numbers and the component names in fig. 1 to 3 is:

1 rotor, 10 rotor core, 102 mounting grooves, 104 first circular arc segment, 106 depressed sections, 108 protruding sections, 110 second circular arc segment, 112 third circular arc segment, 114 fourth circular arc segment, 116 fifth circular arc segment, 118 first transition section, 120 second transition section, 122 third transition section, 20 permanent magnet, 30 slit, 302 first slit, 304 second slit, 2 stator core, 22 tooth, 24 stator slot.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

The rotor 1, the motor, the compressor, and the refrigeration apparatus according to some embodiments of the present invention will be described below with reference to fig. 1 to 3.

The first embodiment is as follows:

as shown in fig. 1 and 2, a rotor 1 according to an embodiment of the present invention includes: rotor core 10 and permanent magnets 20.

Wherein, the rotor core 10 is provided with a mounting groove 102; a permanent magnet 20, the permanent magnet 20 being disposed in the mounting groove 102 and forming a magnetic pole; the outer peripheral surface of the rotor core 10 between the adjacent d-axis and q-axis sequentially comprises a first arc section 104, a concave section 106, a convex section 108 and a second arc section 110 which are connected with each other along the circumferential direction; the center of the first arc segment 104 is located on the axis of the rotor core 10, and the first arc segment 104 intersects with the d-axis; the q axis intersects the second arc segment 110 and passes through the center of the second arc segment 110; the radius of the first arc segment 104 is greater than the distance from any point on the concave segment 106, the convex segment 108 and the second arc segment 110 to the axis of the rotor core 10; a center line of any one magnetic pole passing through the axis of the rotor core 10 is defined as a d-axis, and an angular bisector of two adjacent d-axes is defined as a q-axis.

In detail, this application has rationally set up the structure of the outer peripheral face of rotor core 10 for the outer peripheral face of rotor core 10 between adjacent d axle and q axle includes first circular arc section 104, sunken section 106, protruding section 108 and the second circular arc section 110 that connects in proper order along circumference, and wherein, the radius of first circular arc section 104 is greater than the distance of any point to the axis of rotor core 10 on sunken section 106, protruding section 108 and the second circular arc section 110, that is to say, the distance of first circular arc section 104 to the axis of rotor core 10 is the biggest in the outer peripheral face of rotor core 10 between adjacent d axle and the q axle. The outer peripheral surface of the rotor core 10 is sequentially transited to the concave section 106, the convex section 108 and the second arc section 110 by the first arc section 104, that is, the outer edge of the cross section of the rotor core 10 perpendicular to the axis of the rotor core 10 is a non-full-circle structure. This structural setting can effectively improve the armature iron loss of the motor that uses this rotor 1, reduces the vibration noise of motor, simultaneously, can improve the back electromotive force wave form of motor, and promotes the operation efficiency of motor. In addition, the first arc segment 104, the concave segment 106, the convex segment 108 and the second arc segment 110 utilize the characteristics of respective appearance structures to make the requirements of high energy efficiency and low noise during the operation of the motor balanced, and further on the premise of ensuring that the output torque of the motor is basically equivalent, the cogging torque of the motor can be effectively reduced, the air gap flux density harmonic wave can be reduced, the counter electromotive force waveform of the motor can be improved, and the noise vibration and energy efficiency of the motor and the compressor can be improved.

Example two:

as shown in fig. 1 and 2, in an embodiment of the present invention, the rotor 1 includes: rotor core 10 and permanent magnet 20, sunken section 106 includes third circular arc section 112 and fourth circular arc section 114, and protruding section 108 includes fifth circular arc section 116.

The centers of the third arc segment 112 and the fifth arc segment 116 are located on the axis of the rotor core 10, and the radius r1 of the first arc segment 104, the radius r2 of the third arc segment 112, the radius r3 of the fourth arc segment 114, and the radius r4 of the fifth arc segment 116 satisfy: r3 is more than r4 and less than or equal to r2 and less than r 1; the distance d1 from the end of the first circular arc segment 104 facing away from the d-axis to the d-axis and the distance d2 from the end of the third circular arc segment 112 facing away from the d-axis to the d-axis satisfy: 0.75 < d1/d2 < 0.95.

In detail, the composition of the concave section 106 and the convex section 108 is further refined, wherein, along the circumferential direction of the rotor core 10, the concave section 106 sequentially includes a first transition section 118, a third arc section 112, a fourth arc section 114 and a second transition section 120 which are connected, and the convex section 108 sequentially includes a third transition section 122 and a fifth arc section 116 which are connected. That is, the first arc segment 104 is connected to the third arc segment 112 through the first transition segment 118, the third arc segment 112 is connected to the fourth arc segment 114, the fourth arc segment 114 is connected to the fifth arc segment 116 through the second transition segment 120 and the third transition segment 122, and the fifth arc segment 116 is connected to the second arc segment 110. Wherein, the distance d1 from the end of the first circular arc segment 104 departing from the d-axis to the d-axis and the distance d2 from the end of the third circular arc segment 112 departing from the d-axis to the d-axis satisfy: d1/d2 is more than 0.75 and less than 0.95, thereby being beneficial to reducing the loss of magnetic flux, improving the efficiency of the motor and improving the service performance of the motor. In addition, the radius r1 of the first arc segment 104, the radius r2 of the third arc segment 112, the radius r3 of the fourth arc segment 114 and the radius r4 of the fifth arc segment 116 satisfy: r3 is more than r4 and less than or equal to r2 is more than r1, the air gap magnetic field waveform can be improved, the armature iron loss can be effectively reduced, the energy efficiency of the motor is improved, meanwhile, the back electromotive force waveform of the motor can be improved, and the running noise of the motor is reduced.

Optionally, the radius r1 of the first arc segment 104 and the radius r2 of the third arc segment 112 satisfy: 0.9 < r2/r1 < 0.98. The ratio relation between the radius r1 of the first circular arc segment 104 and the radius r2 of the third circular arc segment 112 is reasonably limited to meet the requirements that r2/r1 is more than 0.9 and less than 0.98, so that the use requirements of high energy efficiency and low noise during the operation of the motor are considered and balanced by utilizing the shape difference of the first circular arc segment 104 and the third circular arc segment 112. If r2/r1 is less than or equal to 0.9, the energy efficiency of the motor during operation is low, the service performance of the product is poor, and if r2/r1 is greater than or equal to 0.98, the counter potential waveform of the motor is poor, and the operation noise of the motor is large.

Optionally, the radius r1 of the first arc segment 104 and the radius r3 of the fourth arc segment 114 satisfy: r3/r1 is more than 0.5 and less than 0.7. Because the first circular arc segment 104 and the fourth circular arc segment 114 are not concentric, the ratio relation between the radius r1 of the first circular arc segment 104 and the radius r3 of the fourth circular arc segment 114 is reasonably limited so as to satisfy 0.5 < r3/r1 < 0.7. Therefore, the shape difference between the first arc segment 104 and the fourth arc segment 114 is utilized to meet and balance the use requirements of high energy efficiency and low noise when the motor operates, and the structure is favorable for reducing the loss of magnetic flux, improving the efficiency of the motor and improving the use performance of the motor.

Alternatively, the permanent magnets 20 are configured in a V-shape or a W-shape, the permanent magnets 20 are distributed in a mirror image with the d-axis as the symmetry axis, and the openings of the V-shape or the W-shape face away from the axis of the rotor core 10. Through the reasonable structure of injecing permanent magnet 20 for permanent magnet 20 is constructed for V type or W type, and the magnetic concentration effect that V type or W type permanent magnet produced is favorable to promoting motor back emf, and then is favorable to promoting the low frequency energy efficiency of the compressor that uses this rotor 1, and it can be understood that permanent magnet 20 also can be for satisfying the permanent magnet of other shapes of requirement.

Specifically, the number of the permanent magnets 20 is plural, the number of pole pairs formed by arranging the permanent magnets 20 in the mounting grooves 102 is P, and the magnetic poles of two adjacent permanent magnets 20 are opposite, that is, the permanent magnets 20 form 2P magnetic poles with alternating polarity along the circumferential direction of the rotor core 10, the d axis is an axis passing through the center line of any one magnetic pole of the axis of the rotor core 10, and the q axis is an axis which is 180 °/P different from the d axis and passes through the axis of the rotor core 10.

Example three:

as shown in fig. 1 and 2, in an embodiment of the present invention, the rotor 1 includes: rotor core 10, permanent magnet 20 and slit 30, sunken section 106 includes third circular arc section 112 and fourth circular arc section 114, and protruding section 108 includes fifth circular arc section 116.

Wherein, slit 30 is set up on rotor core 10 between adjacent d axle and q axle, and slit 30 is located the installation groove 102 and keeps away from the one side of the axis of rotor core 10, and slit 30 sets up with the slope of installation groove 102.

In detail, the rotor 1 further includes the slits 30, the slits 30 are provided on the rotor core 10 between the adjacent d-axis and q-axis, the slits 30 are located on a side of the mounting groove 102 away from the axis of the rotor core 10, and the slits 30 are provided obliquely with respect to the mounting groove 102. The structural arrangement of the slit 30 relative to the mounting groove 102 can reduce the influence of the armature magnetic field of the motor on the main magnetic field of the rotor 1, improve the load magnetic density of the motor, optimize the air gap magnetic density waveform of the motor, further improve the radial force of the motor and reduce the running noise of the motor.

Alternatively, as shown in fig. 1 and 2, the number of the slits 30 is plural, the plural slits 30 include at least a first slit 302 and a second slit 304, and the first slit 302 is located between the second slit 304 and the d-axis; the included angle a1 of the two first slits 302 which are distributed in a mirror image mode by taking the d axis as the symmetry axis satisfies the following condition: a1 is more than or equal to 30 degrees and less than or equal to 50 degrees; the included angle a2 of the two second slits 304 distributed in mirror image with the d-axis as the symmetry axis satisfies: a2 is more than or equal to 30 degrees and less than or equal to 50 degrees. In detail, the plurality of slits 30 includes at least a first slit 302 and a second slit 304 by properly defining the composition and arrangement position of the plurality of first slits 302, and the first slits 302 are located between the second slits 304 and the d-axis. That is, the two first slits 302 that are mirror-distributed with the d-axis as the symmetry axis are arranged in an inner "eight" shape, and the two second slits 304 that are mirror-distributed with the d-axis as the symmetry axis are arranged in an inner "eight" shape, so that the problem of magnetic flux leakage and increase of magnetic flux density harmonics caused by the outer "eight" shape distribution of the slits 30 near the inter-poles and the adjacent slits 30 in the related art is avoided. The value ranges of the included angle a1 of the two first slits 302 and the included angle a2 of the two second slits 304 are limited, so that the requirements that the a1 is more than or equal to 30 degrees and is less than or equal to 50 degrees and the a2 is more than or equal to 30 degrees and is less than or equal to 50 degrees are met, and thus, the magnetic flux leakage can be reduced or avoided, the radial force density of the motor is reduced, the magnetic flux is not reduced under the condition of reducing the fundamental wave of the radial electromagnetic force of the motor, and the noise of the motor is greatly reduced under the condition of ensuring that the counter potential of the motor is not changed. Specifically, the number of the first slits 302 is one, and the number of the second slits 304 is one.

Optionally, the included angle a1 and the included angle a2 satisfy: a1 < a 2. Through reasonable limitation of the value ranges of the included angle a1 and the included angle a2, the included angle a1 and the included angle a2 satisfy the following conditions: a1 is less than a2, on one hand, the smoothness of a part of magnetic circuits near a q axis can be ensured, the increase of the proportion of reluctance torque of the motor is facilitated, and further the high-rotating-speed reliable operation of the high-power motor is facilitated, on the other hand, the reduction of magnetic flux can be reduced, the manufacturing cost is facilitated to be saved, and the cost performance of the motor is improved.

Optionally, the length of the first slit 302 is greater than the length of the second slit 304. The portion of the rotor core 10 between the adjacent d-axis and q-axis is smaller in area of the slit 30 as it is closer to the outer circumferential surface thereof by being limited by the installation position relationship of the installation groove 102 and the slit 30, so that the length of the first slit 302 is greater than that of the second slit 304 by limiting the lengths of the first slit 302 and the second slit 304, which facilitates the reasonable layout of the plurality of slits 30, thereby improving noise while ensuring the reduction of cogging torque and torque ripple.

Optionally, the number of the plurality of slits 30 is greater than or equal to 2 and less than or equal to 6, that is, the number N of the slits 30 satisfies 2 ≤ N ≤ 6, so as to avoid the problems of reduced structural strength of the rotor core, reduced magnetic flux, and increased cogging torque caused by excessive number of slits in the related art, and avoid the problem that the radial force of the motor cannot be effectively improved due to the small number of slits. Therefore, the number of the plurality of slits 30 is set within a reasonable range, so that the good noise reduction effect and back electromotive force effect of the motor can be effectively guaranteed and the cost performance of the motor can be improved under the condition that the reliability of the rotor core 10 and the processing are guaranteed.

In detail, the plurality of slits 30 may be one or a combination of a straight slit, a curved slit, a bent slit, and other types of slits that meet the requirement, wherein the curved slit includes an arc slit. Meanwhile, the shape of the slit 30 can also be set according to the specific position and the specific shape of the mounting groove 102, the specific position and the specific shape of the stator slot 24 of the stator arranged on the periphery of the rotor core 10, and the specific position and the specific shape of the stator convex tooth, so that the radial force of the motor is effectively improved, the cogging torque is reduced, and a good noise reduction effect is ensured. As shown in the rotor 1 of fig. 1 and 2, a plurality of linear slits are provided between adjacent d-and q-axes.

In detail, the rotor core 10 includes a plurality of lamination sheets stacked one on another; the number of the mounting grooves 102 is plural, and the plural mounting grooves 102 are distributed along the circumferential direction of the rotor core 10. The rotor core 10 includes a plurality of stacked laminations, specifically, the rotor core 10 is formed by stacking a plurality of laminations in a predetermined shape, the mounting grooves 102 are disposed inside the rotor core 10 and distributed along the circumferential direction of the rotor core 10, and 2P magnetic poles with alternating polarity in the circumferential direction are formed by inserting a plurality of permanent magnets 20 into the mounting grooves 102. Preferably, the punching sheet is a silicon steel sheet.

Example four:

as shown in fig. 3, the motor according to the embodiment of the present invention includes: such as the rotor 1 and the stator core 2 in any of the above embodiments.

Wherein, stator core 2 is enclosed outside rotor 1.

The utility model provides a motor, because include rotor 1 as above-mentioned any one embodiment, consequently have above-mentioned rotor 1's whole beneficial effect, do not make the statement one by one here.

Optionally, the motor is PMSM, and the motor that this application provided has the efficiency height, power density is high, the characteristics that the noise is low.

The specific embodiment is as follows:

the application provides a motor. A rotor core 10 of the motor is provided with mounting grooves 102 of a plurality of permanent magnets 20 arranged at intervals along the circumferential direction of the rotor core 10, the center of a first arc section 104 in a plane perpendicular to the central axis of the rotor core 10 coincides with the axis of the rotor core 10, the radius of the first arc section 104 is r1, and the distance d1 from one end of the first arc section 104 departing from the d axis to the d axis; a third arc segment 112, the center of the third arc segment 112 coincides with the axis of the rotor core 10, the radius of the third arc segment 112 is r2, and the distance d2 from one end of the third arc segment 112 departing from the d axis to the d axis; a fourth arc segment 114, the radius of the fourth arc segment 114 being r 3; a fifth arc segment 116, the radius of the fifth arc segment 116 being r 4; a second arc segment 110, through which the q-axis of the rotor core 10 passes; satisfies d1/d2 of 0.75 < d1 < 0.95, r2 < r1, r3 < r1, r4 < r 1; according to the rotor 1, the radius of the first circular arc section 104 is r1, the radius of the third circular arc section 112 is r2, and the requirements that r2/r1 is more than 0.90 and less than 0.98 are met; according to the rotor 1, the radius of the first circular arc section 104 is r1, the radius of the fourth circular arc section 114 is r3, and the requirements that r3/r1 is more than 0.50 and less than 0.70 are met; in the rotor 1 of the present application, the permanent magnet 20 is configured in a V-shape or a W-shape; slits 30 are arranged in the rotor core 10, the number of the slits is 4, each pole slit 30 is symmetrical about the d axis of the rotor core 10, and the slits 30 and the corresponding mounting grooves 102 are obliquely arranged; the motor stator and rotor slots are matched into 9 slots and 6 poles; the motor stator and rotor slots are matched into 12 slots and 8 poles.

Example five:

as shown in fig. 3, in an embodiment of the present invention, the motor includes: a rotor 1, a stator core 2, and a coil, the stator core 2 including a stator body and a plurality of teeth 22.

The plurality of teeth 22 are arranged on the inner side wall of the stator body towards the rotor 1, two adjacent teeth 22 define a stator slot 24, coils of the motor are wound on the teeth 22, the number of the stator slot 24 is Z, the number of pole pairs of the rotor 1 is P, and Z/2P is 9/6 or 12/8.

In detail, the stator core 2 includes a stator body and a plurality of teeth portions 22. Wherein, a stator slot 24 is defined between adjacent teeth 22, coils are wound on the teeth 22, and the stator core 2 is arranged around the rotor 1. By defining the proportional relationship between the number Z of stator slots 24 and the number P of pole pairs of the rotor 1, Z/2P is 9/6 or 12/8, i.e. the pole slot cooperation of the electric machine is defined. When the number of pole pairs of the rotor 1 is P, the number of pole pairs of the rotor 1 is 2P, that is, the motor can be a 6-pole 9-slot motor or an 8-pole 12-slot motor. Of course, a 10-pole 12-slot motor or a 4-pole 6-slot motor is also possible, but this is not an example. The motor of the type can effectively reduce armature iron loss, promote magnetic flux and further promote motor efficiency.

Further, a plurality of stator slots 24 are provided on the stator core 2 and distributed along the circumferential direction of the stator core 2, and preferably, the plurality of stator slots 24 are uniformly distributed at equal intervals in the circumferential direction of the stator core 2. The plurality of teeth 22 are provided on the inner sidewall of the stator body toward the rotor core 10, each of the plurality of teeth 22 is provided between adjacent two of the plurality of stator slots 24, i.e., each of the plurality of stator slots 24 is provided between adjacent two of the plurality of teeth 22, and the coils are provided on the plurality of teeth 22.

Specifically, the coil is disposed on the teeth 22 by means of a wound or a coil-embedded manner.

Example six:

according to the utility model discloses a compressor, include: a rotor 1 as in any one of the embodiments described above or a motor as in any one of the embodiments described above.

The utility model provides a compressor, because of including rotor 1 or motor as above-mentioned any one embodiment, consequently have the whole beneficial effect of above-mentioned rotor 1 or motor, do not make the statement here one by one.

The utility model provides a compressor has the characteristics that the efficiency is high, power density is high, the noise is low.

Example seven:

according to the utility model discloses a refrigeration plant, include: the rotor 1 as in any of the above embodiments or the motor as in any of the above embodiments or the compressor as in any of the above embodiments.

The utility model provides a refrigeration equipment, because of including rotor 1 or the motor of above-mentioned any embodiment or the compressor of above-mentioned any embodiment as above-mentioned any embodiment, consequently have above-mentioned rotor 1 or motor or compressor's whole beneficial effect, do not do the statement here one by one.

Preferably, the motor and the compressor provided by the present application can be used for an air conditioner or a refrigerator, and of course, the motor and the compressor can also be applied to other devices, and the motor and the compressor are within the protection scope of the present application as long as the motor and the compressor do not depart from the design concept of the present application.

In the present application, the term "plurality" means two or more unless expressly defined otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description of the present specification, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (13)

1. A rotor, comprising:

the rotor comprises a rotor core, a rotor core and a rotor core, wherein the rotor core is provided with a mounting groove;

the permanent magnet is arranged in the mounting groove and forms a magnetic pole;

the outer peripheral surface of the rotor core between the adjacent d shaft and q shaft sequentially comprises a first arc section, a concave section, a convex section and a second arc section which are connected in the circumferential direction;

the circle center of the first arc section is positioned on the axis of the rotor core, and the first arc section is intersected with the d axis;

the q axis is intersected with the second arc section and passes through the circle center of the second arc section;

the radius of the first arc section is larger than the distance from any point on the concave section, the convex section and the second arc section to the axis of the rotor core;

wherein a center line of any one of the magnetic poles passing through an axis of the rotor core is defined as the d-axis, and a bisector of an angle between two adjacent d-axes is defined as the q-axis.

2. The rotor of claim 1,

the concave section comprises a third arc section and a fourth arc section, and the convex section comprises a fifth arc section along the circumferential direction of the rotor core;

the circle centers of the third arc segment and the fifth arc segment are both positioned on the axis of the rotor core,

the radius r1 of the first circular arc segment, the radius r2 of the third circular arc segment, the radius r3 of the fourth circular arc segment and the radius r4 of the fifth circular arc segment satisfy: r3 is more than r4 and less than or equal to r2 and less than r 1;

the distance d1 from one end of the first circular arc segment facing away from the d axis to the d axis and the distance d2 from one end of the third circular arc segment facing away from the d axis to the d axis satisfy: 0.75 < d1/d2 < 0.95.

3. The rotor of claim 2,

the radius r1 of the first circular arc segment and the radius r2 of the third circular arc segment satisfy: 0.9 < r2/r1 < 0.98.

4. The rotor of claim 2,

the radius r1 of the first circular arc segment and the radius r3 of the fourth circular arc segment satisfy: r3/r1 is more than 0.5 and less than 0.7.

5. The rotor of any one of claims 1 to 4,

the permanent magnets are constructed in a V shape or a W shape, the permanent magnets are distributed in a mirror image mode by taking the d axis as a symmetry axis, and the openings of the V shape or the W shape are deviated from the axis of the rotor core.

6. The rotor of any one of claims 1 to 4, further comprising:

the slit is arranged on the rotor core between the adjacent d shaft and the q shaft and is positioned on one side, away from the axis of the rotor core, of the mounting groove;

wherein the slit is obliquely arranged relative to the mounting groove.

7. The rotor of claim 6,

the number of the slits is multiple, the multiple slits at least comprise a first slit and a second slit, and the first slit is positioned between the second slit and the d axis;

the included angle a1 of the two first slits which are distributed in a mirror image mode by taking the d axis as a symmetry axis satisfies the following conditions: a1 is more than or equal to 30 degrees and less than or equal to 50 degrees;

the included angle a2 of the two second slits which are distributed in a mirror image mode by taking the d axis as a symmetry axis satisfies the following conditions: a2 is more than or equal to 30 degrees and less than or equal to 50 degrees.

8. The rotor of claim 7,

the included angle a1 and the included angle a2 satisfy: a1 < a 2.

9. The rotor of claim 8,

the length of the first slit is greater than the length of the second slit.

10. An electric machine, comprising:

a rotor as claimed in any one of claims 1 to 9;

and the stator core is arranged around the outer side of the rotor.

11. The electric machine of claim 10,

the stator core is provided with a stator body and a plurality of tooth parts, the tooth parts are arranged on the inner side wall of the stator body towards the rotor, and a stator slot is defined by two adjacent tooth parts;

the coil of the motor is wound on the tooth part;

the number of the stator slots is Z, the number of pole pairs of the rotor is P, and Z/2P is 9/6 or 12/8.

12. A compressor, comprising:

a rotor as claimed in any one of claims 1 to 9; or

An electrical machine as claimed in claim 10 or 11.

13. A refrigeration apparatus, comprising:

a rotor as claimed in any one of claims 1 to 9; or

The electric machine of claim 10 or 11; or

The compressor of claim 12.

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