CN210246575U - Motor, compressor and refrigeration plant - Google Patents
Motor, compressor and refrigeration plant Download PDFInfo
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- CN210246575U CN210246575U CN201921394329.5U CN201921394329U CN210246575U CN 210246575 U CN210246575 U CN 210246575U CN 201921394329 U CN201921394329 U CN 201921394329U CN 210246575 U CN210246575 U CN 210246575U
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Abstract
The utility model provides a motor, compressor and refrigeration plant. Wherein, the motor includes: the rotor comprises a rotor iron core, and the rotor iron core is provided with a mounting groove and a permanent magnet which is positioned in the mounting groove and forms a magnetic pole; the stator comprises a stator core, the stator core is arranged on the outer side of the rotor core in a surrounding mode and comprises a plurality of tooth parts and yoke parts; 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; in a cross section of the stator core in a radial direction thereof, a ratio of a width of the yoke portion to a width of the tooth portion is greater than 0.75 and less than 0.95. The utility model discloses improve the armature iron loss of motor, reduced the vibration noise of motor, promoted the operation efficiency of motor.
Description
Technical Field
The utility model relates to a compressor technical field particularly, relates to a 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 present invention aims at least solving one of the technical problems existing in the prior art or the related art.
To this end, a first aspect of the present invention provides an electric machine.
A second aspect of the present invention provides a compressor.
A third aspect of the present invention provides a refrigeration apparatus.
In view of this, the first aspect of the present invention provides an electric machine, including: the rotor comprises a rotor iron core, and the rotor iron core is provided with a mounting groove and a permanent magnet which is positioned in the mounting groove and forms a magnetic pole; the stator comprises a stator core, the stator core is arranged on the outer side of the rotor core in a surrounding mode and comprises a plurality of tooth parts and yoke parts; 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; in a cross section of the stator core in a radial direction thereof, a ratio of a width of the yoke portion to a width of the tooth portion is greater than 0.75 and less than 0.95; 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 motor includes rotor and stator. Wherein, the rotor includes that rotor core and permanent magnet rotor core are provided with the mounting groove, the permanent magnet sets up in the mounting groove and forms the magnetic pole, establish to the d axle through the central line of the arbitrary magnetic pole in rotor core's axle center, the axle definition that the angular bisector of two adjacent d axles is the q axle, make rotor core's between adjacent d axle and the q axle outer peripheral face include the first circular arc section that is connected along circumference in proper order, sunken section, protruding section and second circular arc section, wherein, the radius of first circular arc section is greater than sunken section, the distance of any point to rotor core's axis on protruding section and the second circular arc section, that is to say, the distance of first circular arc section to rotor core's axis is the biggest in the rotor core's the outer peripheral face between adjacent d axle and the q axle. 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.
Meanwhile, in the cross section of the stator core along the radial direction, the ratio of the width of the yoke part to the width of the tooth part is more than 0.75 and less than 0.95, and the structural arrangement can ensure the safety, stability and reliability of the rotation of the rotor positioned in the stator core. Meanwhile, the structure can enable the magnetic field of the permanent magnet to smoothly flow in the stator core, and stray loss and motor copper loss caused by stator magnetic circuit saturation are reduced.
According to the utility model discloses foretell motor 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 plurality of teeth set up along stator core's circumference, and two adjacent teeth inject the stator slot, and the notch height d1 of stator slot, the radius r1 of first circular arc section and the radius r4 of fifth circular arc section satisfy: 5 < d1/(r1-r4) < 7.
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 radius r1 of first circular arc section, 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 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 addition, the notch height d1 of the stator slot, the radius r1 of the first circular arc segment and the radius r4 of the fifth circular arc segment satisfy: d1/(r1-r4) < 7 is more than 5, so that the armature reaction iron loss of the motor can be effectively reduced, the energy efficiency of the motor is further improved, the area of a stator slot gap can be increased by the structural arrangement, and more coils of the motor can be accommodated. If d1/(r1-r4) is less than 5, the back emf waveform distortion is strong, which increases the distortion rate of the load flux density waveform and increases the vibration noise during the operation of the motor.
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 and 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 satisfy the following conditions: a1 < a 2.
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 and 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 satisfy the following conditions: a1 < a2, which can effectively improve the waveform distortion rate of the permanent magnet and the counter electromotive force magnetic field of the motor, thereby effectively improving the noise vibration of the motor and the compressor.
In any of the above solutions, preferably, the included angle a1 satisfies: a1 is more than or equal to 30 degrees and less than or equal to 50 degrees; and the included angle a2 satisfies: a2 is more than or equal to 30 degrees and less than or equal to 50 degrees.
In the technical scheme, the value ranges of the included angle a1 and the included angle a2 are reasonably limited, so that the cogging torque and the torque pulsation can be reduced, and the noise is improved.
In addition, the structure can ensure that a part of magnetic circuits near the q axis is smooth, is favorable for increasing the proportion of reluctance torque of the motor, and further is favorable for high-speed and reliable operation of a high-power motor, and can reduce the reduction of magnetic flux, thereby being favorable for saving the manufacturing cost and further improving the cost performance of the motor.
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.
In any of the above technical solutions, preferably, the slit includes any one or a combination of the following: linear slits, curved slits, and bent slits.
In the technical scheme, the slit can be one or a combination of a linear slit, a curved slit and a bent slit, and can also be other types of slits meeting the requirements, wherein the curved slit comprises an arc slit. Meanwhile, the shape of the slit can be set according to the specific position and the specific shape of the mounting groove, the specific position and the specific shape of the stator slot arranged on the periphery of the rotor core, and the specific position and the specific shape of the tooth part, so that the radial force of the motor is effectively improved, the cogging torque is reduced, and a good noise reduction effect is ensured.
In any of the above embodiments, the number of the plurality of slits is preferably 2 or more and 6 or less.
In the technical scheme, the number of the plurality of slits is more than or equal to 2 and less than or equal to 6, so that the problems that the structural strength of the rotor core is reduced, the magnetic flux is reduced and the cogging torque is increased due to the excessive number of the slits in the related technology are solved, the problem that the radial force of the motor cannot be effectively improved due to the small number of the slits is solved, the suppression effect on the magnetic field of the stator armature is better due to the large number of the plurality of slits, the back electromotive force of the motor can be reduced, and the manufacturing difficulty is increased. Therefore, the number of the slits is set within a reasonable range, so that the good noise reduction effect and counter potential effect of the motor can be effectively guaranteed under the condition of guaranteeing the reliability of the rotor core and facilitating processing, and the cost performance of the motor is improved.
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 core includes a plurality of stacked laminations; the quantity of mounting groove is a plurality of, and a plurality of mounting grooves distribute along rotor core's circumference.
In this technical scheme, rotor core includes a plurality of towards the piece that piles up mutually, specifically, rotor core is piled up by a certain quantity, according to a plurality of towards the piece of regulation shape and constitutes, and the mounting groove is located rotor core's inside and distributes along rotor core's circumference, and insert in the mounting groove and then form 2P magnetic poles that polarity changes in the circumference through a plurality of permanent magnets. Preferably, the punching sheet is a silicon steel sheet.
In any one of the above technical solutions, preferably, the motor further includes: the coil 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 the technical scheme, the motor further comprises a coil, wherein the coil is wound on the tooth part, 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.
A second aspect of the present invention provides a compressor, including: the electric machine according to any one of the preceding claims.
The utility model provides a compressor, because of include as in any one of the first aspect the motor, consequently have the whole beneficial effect of above-mentioned motor, do not make the statement one by one here.
A third aspect of the present invention provides a refrigeration apparatus, comprising: the motor of any one of the above technical aspects of the first aspect; or the compressor of any of the second aspects.
The utility model provides a refrigeration plant, because of including as in any one of the first aspect the motor, or any technical scheme in the second aspect the compressor. Therefore, the motor or the compressor has all the advantages of the motor or the compressor, and the description is omitted.
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 stator core according to an embodiment of the present invention;
fig. 4 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 part names in fig. 1 to 4 is:
1 rotor, 10 rotor cores, 102 mounting grooves, 104 first arc segment, 106 depressed segments, 108 raised segments, 110 second arc segment, 112 third arc segment, 114 fourth arc segment, 116 fifth arc segment, 118 first transition segment, 120 second transition segment, 122 third transition segment, 20 permanent magnets, 30 slits, 302 first slits, 304 second slits, 2 stator cores, 22 teeth, 24 stator slots, 26 yokes.
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 following describes the motor, the compressor and the refrigeration apparatus according to some embodiments of the present invention with reference to fig. 1 to 4.
The first embodiment is as follows:
as shown in fig. 1 to 4, a motor according to an embodiment of the present invention includes a stator and a rotor 1, the rotor 1 being provided with a rotor core 10 and a permanent magnet 20, and the stator being provided with a stator core 2.
Wherein, the rotor core 10 is provided with a mounting groove 102 and a permanent magnet 20 which is positioned in the mounting groove 102 and forms a magnetic pole, the stator core 2 is enclosed outside the rotor core 10, the stator core 2 comprises a plurality of tooth parts 22 and yoke parts 26, the 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 along the circumferential direction, the circle center of the first arc section 104 is positioned on the axis of the rotor core 10, the first arc segment 104 intersects with the d-axis, the q-axis intersects with the second arc segment 110 and passes through the center of the second arc segment 110, in the cross section of the stator core 2 along the radial direction, the ratio of the width of the yoke portion 26 to the width of the tooth portion 22 is greater than 0.75 and less than 0.95, the center line of any one magnetic pole passing through the axis of the rotor core 10 is defined as the d-axis, and the bisector of the two adjacent d-axes is defined as the 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 counter electromotive force waveform of the motor is improved, and the noise vibration and energy efficiency of the motor and the compressor are improved.
Meanwhile, in a cross section of the stator core 2 in the radial direction thereof, the ratio of the width d2 of the yoke portion 26 to the width d3 of the tooth portion 22 satisfies: 0.75 < d2/d3 < 0.95, and the structural arrangement can ensure the safety, stability and reliability of the rotation of the rotor 1 positioned in the structure. Meanwhile, the structure arrangement can enable the magnetic field of the permanent magnet 20 to smoothly flow in the stator core 2, and stray loss and motor copper loss caused by stator magnetic circuit saturation are reduced.
Specifically, the motor of this application has that air gap flux density harmonic content is few, can effectively reduce stray loss and motor monomer vibration to simple structure easily produces manufacturing.
Example two:
as shown in fig. 1 and 2, in an embodiment of the present invention, the motor includes stator and rotor 1, rotor 1 is provided with rotor core 10 and permanent magnet 20, the stator is provided with stator core 2, 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 second circular arc section 110 that connect along circumference in proper order, sunken section 106 includes third circular arc section 112 and fourth circular arc section 114, 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 < r4 < r2 < r1, the plurality of tooth portions 22 are arranged along the circumferential direction of the stator core 2, two adjacent tooth portions 22 define a stator slot 24, and the notch height d1 of the stator slot 24, the radius r1 of the first circular arc segment 104 and the radius r4 of the fifth circular arc segment 116 satisfy the following conditions: 5 < d1/(r1-r4) < 7.
In detail, as shown in fig. 2 and 3, 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 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. In addition, the slot height d1 of the stator slot 24, the radius r1 of the first circular arc segment 104 and the radius r4 of the fifth circular arc segment 116 satisfy: d1/(r1-r4) < 7 is more than 5, so that the armature reaction iron loss of the motor can be effectively reduced, the energy efficiency of the motor is further improved, the area of the stator slot 24 can be increased by the structural arrangement, and more coils of the motor can be accommodated. If d1/(r1-r4) is less than 5, the back emf waveform distortion is strong, which increases the distortion rate of the load flux density waveform and increases the vibration noise during the operation of the motor.
Example three:
as shown in fig. 1, in an embodiment of the present invention, the motor includes a stator and a rotor 1, the rotor 1 is provided with a rotor core 10, a permanent magnet 20 and a slit 30, and the stator is provided with a stator core 2.
The slits 30 are arranged on the rotor core 10 between the adjacent d-axis and q-axis, and the slits 30 are positioned on one side of the mounting groove 102 away from the axis of the rotor core 10; wherein the slit 30 is obliquely arranged with respect to the mounting 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.
Optionally, 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 and the included angle a2 of the two second slits 304 which are distributed in a mirror image mode by taking the d axis as the symmetry axis satisfy the following conditions: a1 < a 2. The plurality of slits 30 include different types of slits 30, for example, the plurality of slits 30 includes 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. Thus, the included angle a1 of the two first slits 302 and the included angle a2 of the two second slits 304 which are mirror-distributed with the d-axis as the symmetry axis satisfy: a1 < a2, the waveform distortion rate of the back electromotive force magnetic field of the permanent magnet 20 of the motor can be effectively improved, and the noise vibration of the motor and the compressor can be effectively improved. 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.
Optionally, included angle a1 satisfies: a1 is more than or equal to 30 degrees and less than or equal to 50 degrees; and the included angle a2 satisfies: a2 is more than or equal to 30 degrees and less than or equal to 50 degrees. Through the value range of rationally injecing contained angle a1 and contained angle a2, can reduce or avoid the magnetic leakage and reduce the radial force density of motor for the magnetic flux does not descend under the condition of the fundamental wave of the radial electromagnetic force that reduces the motor, and then greatly reduced motor noise under the unchangeable condition of the back emf of guaranteeing the motor, cost.
Further, through limiting the value range of the angle between the included angle a1 and the included angle a2 and limiting the angle relation between the included angle a1 and the included angle a2, on one hand, the magnetic circuit of a part near the q axis can be guaranteed to be smooth, the occupation ratio of reluctance torque of the motor can be increased, high-power motor high-rotating-speed reliable operation can be facilitated, on the other hand, the reduction of magnetic flux can be reduced, the manufacturing cost can be saved, and the cost performance of the motor can be 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.
Alternatively, the slit 30 includes any one or combination of the following: linear slits, curved slits, and bent slits. The slit 30 may be one or a combination of a straight slit, a curved slit, a bent slit, and other types of slits meeting the requirement, wherein the curved slit includes an arc slit. Meanwhile, the shape of the slit 30 can 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 arranged on the outer periphery of the rotor core 10, and the specific position and the specific shape of the tooth portion 22, so that the radial force of the motor is effectively improved, the cogging torque is reduced, and a good noise reduction effect is ensured.
Alternatively, the number of the plurality of slits 30 is 2 or more and 6 or less. The number of the plurality of slits 30 is greater than or equal to 2 and less than or equal to 6, so that the problems that the structural strength of the rotor core 10 is reduced, the magnetic flux is reduced and the cogging torque is increased due to the fact that the number of the slits 30 is too large in the related art are solved, meanwhile, the problem that the radial force of the motor cannot be effectively improved due to the fact that the number of the slits 30 is small is solved, the effect of suppressing the magnetic field of the stator armature is better due to the fact that the number of the plurality of slits 30 is larger, the back electromotive force of the motor can be reduced. 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.
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 reasonable limiting of the shape structure of the permanent magnet 20, the permanent magnet 20 is constructed into a V-shaped or W-shaped permanent magnet 20, and the magnetic concentration effect generated by the V-shaped or W-shaped permanent magnet 20 is beneficial to improving the back electromotive force of the motor, and is further beneficial to improving the low-frequency energy efficiency of the compressor using the rotor 1, and it can be understood that the permanent magnet 20 can also be a permanent magnet 20 with other shapes meeting the requirements.
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.
Alternatively, 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. 1, in an embodiment of the present invention, the motor includes a stator, a rotor 1 and a coil, the rotor 1 is provided with a rotor core 10, a permanent magnet 20 and a slit 30, and the stator is provided with a stator core 2.
The coils are wound on the teeth 22, the number of the stator slots 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, 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, that is to say, 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.
Specifically, the motor is PMSM, and the motor that this application provided has the efficiency height, power density is high, characteristics that the noise is low.
Example five:
according to the utility model discloses a compressor, include: such as the motor of any of the embodiments described above.
The utility model provides a compressor, because of including the motor as in any one above-mentioned embodiment, consequently have the whole beneficial effect of above-mentioned motor, do not make the statement one by one here.
The utility model provides a compressor has the characteristics that the efficiency is high, power density is high, the noise is low.
Example six:
according to the utility model discloses a refrigeration plant, include: a motor as in any one of the embodiments above or a compressor as in any one of the embodiments above.
The utility model provides a refrigeration plant, because of include motor or above-mentioned any embodiment the compressor, consequently have the whole beneficial effect of above-mentioned motor or compressor, do not do the statement one by one here.
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.
The specific embodiment is as follows:
the motor includes a stator and a rotor 1 formed by laminating electromagnetic steel plates. Wherein rotor 1 sets up inside the stator, and rotor 1 includes rotor core 10, is provided with the mounting groove of a plurality of permanent magnets 20 that set up along rotor core 10 circumference interval on rotor core 10. In a plane perpendicular to the central axis of the rotor core 10, the outer contour of the rotor core 10 includes: a first arc segment 104, wherein the center of the first arc segment 104 coincides with the center of the rotor core 10, and the radius of the first arc segment 104 is r 1; a third arc segment 112, the center of the third arc segment 112 coincides with the center of the rotor core 10, and the radius of the third arc segment 112 is r 2; a fourth arc segment 114, a center of the fourth arc segment 114 is located inside the rotor core 10, and a radius of the fourth arc segment 114 is r 3; a fifth arc segment 116, a center of the fifth arc segment 116 coincides with a center of the rotor core 10, and a radius of the fifth arc segment 116 is r 4; and a second arc segment 110, and the q-axis of the rotor core 10 passes through the center of the second arc segment 110. The radii of the first arc segment 104, the third arc segment 112, the fourth arc segment 114 and the fifth arc segment 116 satisfy: r3 is more than r4 and less than or equal to r2 and less than r 1. The stator comprises a stator core 2, the tooth width of the stator core 2 is set to be d3, the width of a yoke part 26 is set to be d2, and the height of a notch is set to be d 1; satisfies the following conditions: 0.75 < d2/d3 < 0.95, and 5 < d1/(r1-r4) < 7. By limiting the proportional relation between the tooth width of the stator and the yoke width, the magnetic field of the permanent magnet 20 can smoothly flow in the stator core 2, and the stray loss and the motor copper loss caused by the saturation of the stator magnetic circuit are reduced. Meanwhile, the limit of 5 < d3/(r1-r4) < 7 can effectively reduce the armature reaction iron loss of the motor and further improve the energy efficiency of the motor. According to the rotor core 10 of the present application, the slits 30 are provided inside the rotor core 10, the number of the slits 30 is 4, each of the pole slits 30 is axisymmetrical with respect to the rotor core 10d, and the slits 30 are obliquely provided with the corresponding mounting grooves 102. According to the rotor core 10 of the present invention, the included angle of the first slit 302 disposed inside is a1, and the included angle of the second slit 304 disposed outside is a2, which satisfies a1 < a 2; the slits 30 are arranged in the rotor 1, so that the waveform distortion rate of the back electromotive force magnetic field of the permanent magnet 20 of the motor can be effectively improved, and the noise vibration of the motor and the compressor can be effectively improved; according to rotor core 10 of this application, 1 magnetic pole structure of rotor is V type or W type, when being favorable to the motor miniaturization, can further promote the motor efficiency. The motor stator and rotor slots are matched into 9 slots and 6 poles or the motor stator and rotor slots are matched into 12 slots and 8 poles.
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. An electric machine, comprising:
the rotor comprises a rotor iron core, and the rotor iron core is provided with a mounting groove and a permanent magnet which is positioned in the mounting groove and forms a magnetic pole;
the stator comprises a stator core, the stator core is arranged around the outer side of the rotor core and comprises a plurality of tooth parts and yoke parts;
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;
a ratio of a width of the yoke portion to a width of the tooth portion in a cross section of the stator core in a radial direction thereof is greater than 0.75 and less than 0.95;
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 electric machine 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 plurality of teeth are arranged along the circumferential direction of the stator core, a stator slot is defined by two adjacent teeth, and the notch height d1 of the stator slot, the radius r1 of the first circular arc segment and the radius r4 of the fifth circular arc segment satisfy the following conditions: 5 < d1/(r1-r4) < 7.
3. The machine according to claim 1 or 2,
the rotor further includes:
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.
4. The electric machine of claim 3,
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 and 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 satisfy the following conditions: a1 < a 2.
5. The electric machine of claim 4,
included angle a1 satisfies: a1 is more than or equal to 30 degrees and less than or equal to 50 degrees;
and the included angle a2 satisfies: a2 is more than or equal to 30 degrees and less than or equal to 50 degrees.
6. The electric machine of claim 4,
the length of the first slit is greater than the length of the second slit.
7. The electric machine of claim 3,
the slit comprises any one or combination of the following: linear slits, curved slits, and bent slits.
8. The electric machine of claim 3,
the number of the plurality of slits is 2 or more and 6 or less.
9. The electric machine of claim 1 or 2, further comprising:
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.
10. The machine according to claim 1 or 2,
the rotor core comprises a plurality of stacked punching sheets;
the quantity of mounting groove is a plurality of, and is a plurality of the mounting groove is followed rotor core's circumference distributes.
11. The electric machine of claim 2, further comprising:
the coil 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:
an electric machine as claimed in any one of claims 1 to 11.
13. A refrigeration apparatus, comprising:
the electric machine of any one of claims 1 to 11; or a compressor as claimed in claim 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921394329.5U CN210246575U (en) | 2019-08-26 | 2019-08-26 | Motor, compressor and refrigeration plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921394329.5U CN210246575U (en) | 2019-08-26 | 2019-08-26 | Motor, compressor and refrigeration plant |
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| Publication Number | Publication Date |
|---|---|
| CN210246575U true CN210246575U (en) | 2020-04-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921394329.5U Active CN210246575U (en) | 2019-08-26 | 2019-08-26 | Motor, compressor and refrigeration plant |
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| CN (1) | CN210246575U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113555980A (en) * | 2021-07-12 | 2021-10-26 | 珠海格力节能环保制冷技术研究中心有限公司 | Stator punching sheet, stator core, motor and compressor comprising same |
| CN113839476A (en) * | 2021-09-18 | 2021-12-24 | 广东美芝制冷设备有限公司 | Motor, compressor and refrigeration plant |
| CN114977578A (en) * | 2021-02-25 | 2022-08-30 | 莱克电气股份有限公司 | Motor, household appliance, garden tool and vehicle |
-
2019
- 2019-08-26 CN CN201921394329.5U patent/CN210246575U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114977578A (en) * | 2021-02-25 | 2022-08-30 | 莱克电气股份有限公司 | Motor, household appliance, garden tool and vehicle |
| WO2022179315A1 (en) * | 2021-02-25 | 2022-09-01 | 莱克电气股份有限公司 | Motor, household appliance, gardening tool, and vehicle |
| CN114977578B (en) * | 2021-02-25 | 2024-01-26 | 莱克电气股份有限公司 | Motor, household appliance, garden tool and vehicle |
| CN113555980A (en) * | 2021-07-12 | 2021-10-26 | 珠海格力节能环保制冷技术研究中心有限公司 | Stator punching sheet, stator core, motor and compressor comprising same |
| CN113839476A (en) * | 2021-09-18 | 2021-12-24 | 广东美芝制冷设备有限公司 | Motor, compressor and refrigeration plant |
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