CN115001178A - Motor rotor, motor and electric automobile - Google Patents
Motor rotor, motor and electric automobile Download PDFInfo
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- CN115001178A CN115001178A CN202210687771.7A CN202210687771A CN115001178A CN 115001178 A CN115001178 A CN 115001178A CN 202210687771 A CN202210687771 A CN 202210687771A CN 115001178 A CN115001178 A CN 115001178A
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 170
- 239000010959 steel Substances 0.000 claims abstract description 170
- 230000004888 barrier function Effects 0.000 claims abstract description 128
- 230000010349 pulsation Effects 0.000 abstract description 25
- 230000000694 effects Effects 0.000 description 17
- 230000005284 excitation Effects 0.000 description 15
- 238000010586 diagram Methods 0.000 description 8
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000002441 reversible effect Effects 0.000 description 4
- 230000001360 synchronised effect Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000750 progressive effect Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The invention provides a motor rotor, a motor and an electric automobile, wherein the motor rotor comprises: rotor core, last magnet steel groove and two at least magnetic barrier grooves of being provided with of rotor core, and two magnetic barrier grooves set up for rotor core's D axial symmetry, two magnetic barrier grooves are located the position between the radial outer fringe of magnet steel groove and rotor core, and the magnetic barrier groove does not meet with radial outer fringe, the cross section in magnetic barrier groove is the rectangular channel, and can press from both sides between the extension line of the radial inboard long limit of orientation of two rectangular channels and establish 0 ~ 180 angle between, make the opening of the contained angle that forms between the extension line of the radial inboard long limit towards rotor core's center, form the magnetic barrier structure of "anti-V-arrangement". According to the invention, the inverted V-shaped magnetic barrier structure can be effectively distributed at the tail end of the d shaft of the rotor, and the electromagnetic exciting force and the torque pulsation of the motor can be effectively reduced while the output performance of the motor is not influenced, so that the noise of the motor is reduced.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a motor rotor, a motor and an electric automobile.
Background
Most of automobile driving motors are permanent magnet synchronous motors, and the motors are high in power density and small in size and are the mainstream trend at present. However, because the rotor of the motor is of a permanent magnet structure, the motor usually has large torque pulsation and large electromagnetic excitation force at high speed due to the characteristic of unchanged magnetic density, so that the motor has large vibration noise.
At present, the method generally adopted in the aspect of reducing the electromagnetic excitation force is to modify a rotor or a stator, so that the torque pulsation and the excitation force of a certain working condition point can be reduced, but for the driving motor for the vehicle, the rotating speed range is wide, the working condition is complex, and the requirement cannot be met by adopting a simple modification method.
The invention provides a motor rotor, a motor and an electric automobile, which are researched and designed because the technical problems that the motor for the automobile in the prior art has large torque pulsation and high electromagnetic excitation force under multiple working conditions and cannot be simultaneously solved are solved.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defects that the motor for the vehicle in the prior art has large torque pulsation and high electromagnetic excitation force under multiple working conditions and cannot be simultaneously solved, thereby providing the motor rotor, the motor and the electric vehicle.
In order to solve the above problems, the present invention provides a motor rotor, comprising: rotor core, last magnet steel groove and two at least magnet barrier grooves of being provided with of rotor core, and two the magnet barrier groove is for rotor core's D axial symmetry sets up, two the magnet barrier groove is located the magnet steel groove with position between rotor core's the radial outer fringe, just the magnet barrier groove not with radial outer fringe meets, the cross section in magnet barrier groove is the rectangular channel, and can press from both sides between the extension line of the radial inboard long limit of orientation of two rectangular channels and establish 0 ~ 180 angle between for the opening orientation of the contained angle that forms between the extension line of two radial inboard long limits the center of rotor core forms the magnet barrier structure of "anti V-V shape".
In some embodiments, the magnetic steel slots include a first magnetic steel slot and a second magnetic steel slot, the first magnetic steel slot and the second magnetic steel slot also being symmetrically disposed with respect to the D axis; the two magnetic barrier grooves comprise a first magnetic barrier groove and a second magnetic barrier groove, the first magnetic barrier groove is opposite to the first magnetic steel groove and is located at a position between the first magnetic steel groove and the radial outer edge of the rotor core, and the second magnetic barrier groove is opposite to the second magnetic steel groove and is located at a position between the second magnetic steel groove and the radial outer edge of the rotor core.
In some embodiments, the magnetic steel further comprises a magnetic steel, and the magnetic steel is arranged in the magnetic steel groove;
the magnetic steel comprises first magnetic steel arranged in the first magnetic steel groove and second magnetic steel arranged in the second magnetic steel groove, and the first magnetic steel and the second magnetic steel are both of rectangular structures.
In some embodiments, the first magnetic barrier groove and the second magnetic barrier groove are both rectangular grooves, an edge of the first magnetic barrier groove opposite to the second magnetic barrier groove is a first short edge, an edge of the second magnetic barrier groove opposite to the first magnetic barrier groove is a second short edge, an extension line of the first short edge passes through one vertex of the rectangle of the first magnetic steel, and an extension line of the second short edge passes through one vertex of the rectangle of the second magnetic steel.
In some embodiments, an extension of the first short side passes through a vertex of the rectangle of the first magnetic steel closest to the D-axis, and an extension of the second short side passes through a vertex of the rectangle of the second magnetic steel closest to the D-axis.
In some embodiments, the first magnetic barrier groove and the second magnetic barrier groove are both rectangular grooves, a side of the first magnetic barrier groove, which is farthest from the second magnetic barrier groove, is a third short side, a side of the second magnetic barrier groove, which is farthest from the first magnetic barrier groove, is a fourth short side, an extension line of the third short side passes through a long side of the rectangle of the first magnetic steel, and an extension line of the fourth short side passes through a long side of the rectangle of the second magnetic steel.
In some embodiments, the extension line of the third short side passes through the long side of the rectangle of the first magnetic steel and is the long side located on the radial inner side, and the extension line of the fourth short side passes through the long side of the rectangle of the second magnetic steel and is the long side located on the radial inner side.
In some embodiments, the long side of the rectangular magnetic barrier groove ranges from 10 mm to 12 mm; the range of the short side of the rectangular magnetic barrier groove is 1.5-2 mm.
In some embodiments, a portion of the first magnetic steel groove located radially outside the first magnetic steel is a first hollow groove structure, and a side of the first hollow groove structure connected to the first magnetic steel includes a first arc and a second arc; the second magnet steel groove is located the part in the radial outside of second magnet steel is second cavity groove structure, just second cavity groove structure with the limit that second magnet steel meets includes third circular arc and fourth circular arc.
In some embodiments, the first arc and the second arc are both located on a radially outer side of the first hollow trough structure, and the third arc and the fourth arc are both located on a radially outer side of the second hollow trough structure.
In some embodiments, one end of the first circular arc is connected with one vertex of the first magnetic steel, and the other end extends to be connected with one end of the second circular arc, and the arc radius of the first circular arc is R1, the arc radius of the second circular arc is R2, and R1 < R2;
one end of the third circular arc is connected with one vertex of the second magnetic steel, the other end of the third circular arc extends to be connected with one end of the fourth circular arc, the arc radius of the third circular arc is R1, the arc radius of the fourth circular arc is R2, and R1 is less than R2.
In some embodiments, R1 is 5-7 mm and R2 is 25-30 mm.
In some embodiments, the first hollow groove structure further comprises a first straight line segment, a second straight line segment and a third straight line segment, wherein one end of the first straight line segment is connected with the other end of the second circular arc and is a tangent extension line at the other end of the second circular arc, the second straight line segment is connected with the other end of the first straight line segment, the second straight line segment and the third straight line segment are sequentially connected, and the third straight line segment is connected with the first magnetic steel;
the second hollow groove structure further comprises a fourth straight line segment, a fifth straight line segment and a sixth straight line segment, one end of the fourth straight line segment is connected with the other end of the fourth circular arc and is a tangent line extension line at the other end of the fourth circular arc, the fifth straight line segment is connected with the other end of the fourth straight line segment, the fifth straight line segment is sequentially connected with the sixth straight line segment, and the sixth straight line segment is connected with the second magnetic steel.
In some embodiments, the connecting position of the first arc and the second arc forms a first central connecting line with the central connecting line of the rotor core, the connecting position of the third arc and the fourth arc forms a second central connecting line with the central connecting line of the rotor core, and an included angle is formed between the first central connecting line and the second central connecting line.
The invention also provides a motor, which comprises the motor rotor and a motor stator, wherein the stator is positioned on the periphery of the motor rotor.
In some embodiments, the motor stator includes stator slots sequentially arranged at intervals along the circumferential direction, and when the two magnetic barrier slots include a first magnetic barrier slot and a second magnetic barrier slot, an edge of the first magnetic barrier slot opposite to the second magnetic barrier slot is a first short edge, and an edge of the second magnetic barrier slot opposite to the first magnetic barrier slot is a second short edge:
a spacing portion is formed between the first short side and the second short side, a notch of the stator slot is opposite to the spacing portion, and the width of the spacing portion is greater than the width of the notch.
In some embodiments, when the portion of the first magnetic steel slot located at the radial outer side of the first magnetic steel is a first hollow slot structure, and the side of the first hollow slot structure connected to the first magnetic steel includes a first circular arc and a second circular arc; the part of the second magnetic steel groove, which is positioned at the radial outer side of the second magnetic steel, is of a second hollow groove structure, the edge of the second hollow groove structure, which is connected with the second magnetic steel, comprises a third circular arc and a fourth circular arc,
and when the connecting position of the first arc and the second arc forms a first center connecting line with the center connecting line of the rotor core, and the connecting position of the third arc and the fourth arc forms a second center connecting line with the center connecting line of the rotor core:
an extension line of the first center connecting line passes through the center of the notch of the stator slot opposite to the first center connecting line, and an extension line of the second center connecting line passes through the center of the notch of the stator slot opposite to the second center connecting line.
In some embodiments, the number of slots circumferentially spaced between a position where an extension line of the first center connecting line passes through the center of the slot opening of the stator slot opposite thereto and a position where an extension line of the second center connecting line passes through the center of the slot opening of the stator slot opposite thereto is Q/(2p) -1, where Q is the total number of stator slots and p is the number of pole pairs.
The invention also provides an electric automobile which comprises the motor.
The motor rotor, the motor and the electric automobile provided by the invention have the following beneficial effects:
1. according to the invention, the magnetic barrier grooves which are positioned on the radial outer side of the magnetic steel grooves and are not connected with the radial outer edge of the rotor core are arranged on the rotor core, the cross sections of the magnetic barrier grooves are rectangular grooves, and an angle of 0-180 degrees can be clamped between the extension lines of the long sides of the two rectangular grooves facing the radial inner side, so that the opening of an included angle formed between the extension lines of the long sides of the two radial inner sides faces the center of the rotor core to form the reverse V-shaped magnetic barrier structure, and thus the reverse V-shaped magnetic barrier structure is effectively distributed at the tail end of the d axis of the rotor, the electromagnetic exciting force and the torque pulsation of the motor can be effectively reduced while the output performance of the motor is not influenced, and the noise of the motor is reduced. The invention also arranges a structure comprising at least two sections of arcs on the edge of the hollow slot structure of the magnetic steel slot positioned at the radial outer side of the magnetic steel, and forms an effective progressive magnetic barrier structure at the tail end of the magnetic steel slot, thereby simultaneously reducing the electromagnetic excitation force and the torque pulsation of the motor, and further reducing the noise of the motor.
2. The invention also passes through the center of the stator notch at the connecting point of the two sections of circular arcs of one magnetic steel slot and the connecting line of the center of the rotor, passes through the center of the stator notch at the connecting point of the two sections of circular arcs of the other magnetic steel slot which is symmetrical to the connecting point of the two sections of circular arcs of the other magnetic steel slot and the connecting line of the center of the rotor, and the circumferential spacing slot number between the two centers is Q/(2p) -1, so that the magnetic force lines entering the rotor from the two adjacent stator teeth have uniform transition, the change of electromagnetic force is reduced, the magnetic barrier structure of the rotor pole arc can be effectively formed, and the electromagnetic excitation force and the torque pulsation of the motor can be reduced while the output performance of the motor is not influenced, thereby reducing the noise of the motor.
Drawings
FIG. 1 is a schematic view of the rotor structure of the motor of the present invention 1;
FIG. 2 is a schematic view of the rotor structure of the motor of the present invention 2;
FIG. 3 is a schematic view 3 of the rotor structure of the motor of the present invention;
FIG. 4 is a schematic view of the motor of the present invention, FIG. 1;
FIG. 5 is a diagram of the effect of the motor of the present invention in FIG. 1;
FIG. 6 is a diagram of the effect of the motor of the present invention FIG. 2;
FIG. 7 is a diagram of the effect of the motor of the present invention FIG. 3;
fig. 8 is a diagram of the effect of the motor of the present invention in fig. 4.
The reference numerals are represented as:
10. a rotor core; 11. magnetic steel; 111. a first magnetic steel; 112. a second magnetic steel; 12. a magnetic steel groove; 121. A first magnetic steel slot; 1211. a first hollow channel structure; 122. a second magnetic steel slot; 1221. a second hollow trough structure; 21. a magnetic barrier groove; 211. a first magnetic barrier groove; 2111. a first short side; 2112. a third short side; 2113. a first long side; 212. a second magnetic barrier groove; 2121. a second short side; 2122. a fourth short side; 2123. A second long side; 25. a spacer portion; 41. a first arc; 42. a second arc; 41', a third arc; 42', a fourth arc; 43. a first center line; 43' and a second center line; 44. a first straight line segment; 45. a second straight line segment; 46. a third straight line segment; 44', a fourth straight line segment; 45', a fifth straight line segment; 46', a sixth straight line segment; 49. an included angle; 5. a motor stator; 51. a stator slot; 52. a notch.
Detailed Description
Because the rotor of the permanent magnet synchronous motor is of a permanent magnet structure, the electromagnetic excitation force of the motor is large due to the characteristic that the magnetic density of the rotor cannot be changed, and therefore the vibration noise of the motor is large. The electromagnetic exciting force is an inherent characteristic of a motor, at present, a generally adopted method is to shape a rotor or a stator, the shape of the shape modification can directly influence the result of the electromagnetic force, and the complex shape modification can cause the difficulty of the rotor production process.
The invention provides a rotor structure capable of simultaneously reducing torque pulsation and exciting force, aiming at solving the problems of large torque pulsation and high electromagnetic exciting force of a multi-working condition of a motor for a vehicle.
As shown in fig. 1 to 8, the present invention provides a rotor for an electric motor, comprising: rotor core 10, be provided with magnet steel slot 12 and two at least magnetic barrier grooves 21 on rotor core 10, and two magnetic barrier grooves 21 for rotor core 10's D axial symmetry sets up, two magnetic barrier grooves 21 are located magnet steel slot 12 with position between rotor core 10's the radial outer fringe, just magnetic barrier grooves 21 not with radial outer fringe meets, magnetic barrier grooves 21's cross section is the rectangular channel, and can press from both sides the angle between 0 ~ 180 between the extension line of the radial inboard long limit of orientation of two rectangular channels for the opening of the contained angle that forms between the extension line of the radial inboard long limit of two forms towards rotor core 10's center, forms "anti-V-shaped" magnetic barrier structure.
According to the invention, the magnetic barrier grooves which are positioned on the radial outer side of the magnetic steel grooves and are not connected with the radial outer edge of the rotor core are arranged on the rotor core, the cross sections of the magnetic barrier grooves are rectangular grooves, and an angle of 0-180 degrees can be clamped between the extension lines of the long sides of the two rectangular grooves facing the radial inner side, so that the opening of an included angle formed between the extension lines of the long sides of the two radial inner sides faces the center of the rotor core to form the reverse V-shaped magnetic barrier structure, and thus the reverse V-shaped magnetic barrier structure is effectively distributed at the tail end of the d axis of the rotor, the electromagnetic exciting force and the torque pulsation of the motor can be effectively reduced while the output performance of the motor is not influenced, and the noise of the motor is reduced.
The invention solves the following technical problems:
1. the motor torque pulsation is large;
2. the electromagnetic exciting force of the motor is large;
3. the motor has large vibration noise.
Has the advantages that:
1. the motor rotor has the beneficial effects that:
2. the problem of large torque pulsation of the permanent magnet synchronous motor is solved, and the motor vibration at high speed is reduced;
3. the problem of large electromagnetic exciting force of the permanent magnet synchronous motor is solved, and the vibration noise of the motor is reduced.
FIG. 5 is a load magnetic force diagram of a motor using the present invention, in which the magnetic force lines are uniformly distributed; FIG. 6 is a graph of the peak electromagnetic force result for a motor using the present invention, with a 48 octave peak electromagnetic force reduction of more than 90%; the torque ripple is reduced to 1.1% under the peak working condition, fig. 7 is a torque ripple effect diagram of the invention, and the peak torque ripple is reduced to 1.1%; fig. 8 is a graph showing the effect of noise simulation, in which noise caused by electromagnetic force and torque ripple is greatly reduced.
In some embodiments, the magnetic steel slots 12 include a first magnetic steel slot 121 and a second magnetic steel slot 122, and the first magnetic steel slot 121 and the second magnetic steel slot 122 are also symmetrically arranged with respect to the D axis; the two magnetic barrier slots 21 include a first magnetic barrier slot 211 and a second magnetic barrier slot 212, the first magnetic barrier slot 211 is opposite to the first magnetic steel slot 121 and is located at a position between the first magnetic steel slot 121 and the radial outer edge of the rotor core 10, and the second magnetic barrier slot 212 is opposite to the second magnetic steel slot 122 and is located at a position between the second magnetic steel slot 122 and the radial outer edge of the rotor core 10. This is a preferred configuration of the magnet steel slots of the present invention, i.e. it is also a first and a second magnet steel slot arranged symmetrically with respect to the axis D and defining the positions of the first and second flux barrier slots, enabling further optimization of the path of the magnetic lines of the motor and thus of the motor vibrations.
In some embodiments, further comprising a magnetic steel 11 (preferably a permanent magnet), said magnetic steel 11 being arranged in said magnetic steel slot 12;
the magnetic steel 11 includes a first magnetic steel 111 disposed in the first magnetic steel groove 121 and a second magnetic steel 112 disposed in the second magnetic steel groove 122, and both the first magnetic steel 111 and the second magnetic steel 112 are rectangular structures.
The magnetic steel, the first magnetic steel arranged in the first magnetic steel groove and the second magnetic steel arranged in the second magnetic steel groove can form an optimal magnetic line arrangement form, and the magnetic steel with the rectangular structure can optimize the magnetic line distribution of the motor, so that the electromagnetic excitation force and the torque pulsation of the motor can be further reduced.
In some embodiments, the first magnetic barrier groove 211 and the second magnetic barrier groove 212 are rectangular grooves, an edge of the first magnetic barrier groove 211 opposite to the second magnetic barrier groove 212 is a first short edge 2111, an edge of the second magnetic barrier groove 212 opposite to the first magnetic barrier groove 211 is a second short edge 2121, an extension line of the first short edge 2111 passes through one vertex of the rectangle of the first magnetic steel 111, and an extension line of the second short edge 2121 passes through one vertex of the rectangle of the second magnetic steel 112.
The invention can further optimize the path of the magnetic force line of the motor through the arrangement relation, can ensure that the effect of reducing the electromagnetic excitation force and the torque pulsation of the rectangular magnetic barrier groove is the best when the special geometric relation is met, and can further optimize the motor vibration.
In some embodiments, the extension of the first short side 2111 passes through one vertex of the rectangle of the first magnetic steel 111 closest to the D axis, and the extension of the second short side 2121 passes through one vertex of the rectangle of the second magnetic steel 112 closest to the D axis. When the special geometric relation is met, the rectangular magnetic barrier groove can have the best effect of reducing electromagnetic excitation force and torque pulsation, and the motor vibration can be further optimized.
In some embodiments, the first magnetic barrier slot 211 and the second magnetic barrier slot 212 are both rectangular slots, a side of the first magnetic barrier slot 211 farthest from the second magnetic barrier slot 212 is a third short side 2112, a side of the second magnetic barrier slot 212 farthest from the first magnetic barrier slot 211 is a fourth short side 2122, an extension line of the third short side 2112 passes through one long side of the rectangle of the first magnetic steel 111, and an extension line of the fourth short side 2122 passes through one long side of the rectangle of the second magnetic steel 112.
The invention can further optimize the path of the magnetic force line of the motor through the arrangement relation, can ensure that the effect of reducing the electromagnetic excitation force and the torque pulsation of the rectangular magnetic barrier groove is the best when the special geometric relation is met, and can further optimize the motor vibration.
Further preferably, the extension line of the long side of the rectangular magnetic barrier passes through the outer vertex of the magnetic steel, and the extension line of the short side of the magnetic barrier passes through the inner vertex of the magnetic steel.
In some embodiments, an extension line of the third short side 2112 passing through the long side of the rectangle of the first magnetic steel 111 is a long side located on the radial inner side, and an extension line of the fourth short side 2122 passing through the long side of the rectangle of the second magnetic steel 112 is a long side located on the radial inner side. When the special geometric relation is met, the effect of reducing electromagnetic excitation force and torque pulsation of the rectangular magnetic barrier groove can be the best, and motor vibration can be further optimized.
In some embodiments, the long side of the rectangular magnetic barrier groove 21 ranges from 10 mm to 12 mm; the range of the short side of the rectangular magnetic barrier groove 21 is 1.5-2 mm. The magnetic barrier of the present invention is used for changing the path of magnetic lines of force, and therefore needs to have a certain length and width, which cannot be too small, nor too large, and has the optimal effect of reducing electromagnetic exciting force and torque pulsation within the range of 10-12 mm.
In some embodiments, a portion of the first magnetic steel slot 121 located radially outside the first magnetic steel 111 is a first hollow slot structure 1211, and an edge of the first hollow slot structure 1211, which meets the first magnetic steel 111, includes a first circular arc 41 and a second circular arc 42; the portion of the second magnetic steel slot 122 located at the radial outer side of the second magnetic steel 112 is a second hollow slot structure 1221, and the side of the second hollow slot structure 1221 connected to the second magnetic steel 112 includes a third circular arc 41 'and a fourth circular arc 42'. The invention also arranges a structure comprising at least two sections of arcs on the edge of the hollow slot structure of the magnetic steel slot positioned at the radial outer side of the magnetic steel, and forms an effective progressive magnetic barrier structure at the tail end of the magnetic steel slot, thereby simultaneously reducing the electromagnetic excitation force and the torque pulsation of the motor, and further reducing the noise of the motor.
In some embodiments, the first arc 41 and the second arc 42 are located on a radially outer side of the first hollow slot structure 1211, and the third arc 41 'and the fourth arc 42' are located on a radially outer side of the second hollow slot structure 1221. When the relation is satisfied, the effect of reducing electromagnetic exciting force and torque pulsation of the rectangular magnetic barrier groove can be better, and the vibration of the motor can be further optimized.
In some embodiments, one end of the first circular arc 41 is connected to one vertex of the first magnetic steel 111, and the other end extends to be connected to one end of the second circular arc 42, and the arc radius of the first circular arc 41 is R1, the arc radius of the second circular arc 42 is R2, and R1 < R2;
one end of the third arc 41 'is connected to a vertex of the second magnetic steel 112, and the other end extends to and is connected to one end of the fourth arc 42', and the arc radius of the third arc 41 'is R1, the arc radius of the fourth arc 42' is R2, and R1 < R2.
Torque fluctuations can be optimized when this relationship is satisfied, so that harmonics are reduced; the effect of reducing electromagnetic exciting force and torque pulsation of the rectangular magnetic barrier groove is better, and the vibration of the motor can be further optimized.
In some embodiments, R1 is 5-7 mm and R2 is 25-30 mm.
In some embodiments, the first hollow groove 1211 further includes a first straight line segment 44, a second straight line segment 45 and a third straight line segment 46, wherein one end of the first straight line segment 44 is connected to the other end of the second circular arc 42 and is a tangent extension line of the other end of the second circular arc 42, the second straight line segment 45 is connected to the other end of the first straight line segment 44, the second straight line segment 45 and the third straight line segment 46 are sequentially connected, and the third straight line segment 46 is connected to the first magnetic steel 111;
the second hollow slot structure 1221 further includes a fourth straight line segment 44 ', a fifth straight line segment 45 ' and a sixth straight line segment 46 ', one end of the fourth straight line segment 44 ' is connected to the other end of the fourth circular arc 42 ' and is a tangent extension line at the other end of the fourth circular arc 42 ', the fifth straight line segment 45 ' is connected to the other end of the fourth straight line segment 44 ', the fifth straight line segment 45 ' and the sixth straight line segment 46 ' are sequentially connected, and the sixth straight line segment 46 ' is connected to the second magnetic steel 112.
When the relation is satisfied, the effect of reducing the electromagnetic exciting force and the torque pulsation of the magnetic steel groove can be better, and the motor vibration can be further optimized.
In some embodiments, a connection position of the first arc 41 and the second arc 42 and a central connection line of the rotor core 10 form a first central connection line 43, a connection position of the third arc 41 'and the fourth arc 42' and a central connection line of the rotor core 10 form a second central connection line 43 ', and an included angle 49 is formed between the first central connection line 43 and the second central connection line 43'. When the relation is satisfied, the effect of reducing the electromagnetic exciting force and the torque pulsation of the magnetic steel groove can be better, and the motor vibration can be further optimized.
FIG. 5 is a load magnetic force diagram of a motor using the present invention, in which the magnetic force lines are uniformly distributed; FIG. 6 is a graph of the peak electromagnetic force result for a motor using the present invention, with a 48 octave peak electromagnetic force reduction of more than 90%; the torque ripple is reduced to 1.1% under the peak working condition, fig. 7 is a torque ripple effect diagram of the invention, and the peak torque ripple is reduced to 1.1%; fig. 8 is a graph showing the effect of noise simulation, in which noise caused by electromagnetic force and torque ripple is greatly reduced.
The invention also provides a motor, which comprises the motor rotor and a motor stator, wherein the motor stator is positioned on the periphery of the motor rotor.
In some embodiments, the motor stator 5 includes stator slots 51 arranged at intervals in the circumferential direction, and when two of the magnetic barrier slots 21 include a first magnetic barrier slot 211 and a second magnetic barrier slot 212, an edge of the first magnetic barrier slot 211 opposite to the second magnetic barrier slot 212 is a first short edge 2111, and an edge of the second magnetic barrier slot 212 opposite to the first magnetic barrier slot 211 is a second short edge 2121:
a spacing portion 25 is formed between the first short side 2111 and the second short side 2121, the notch 52 of the stator slot 51 is opposite to the spacing portion 25, and the width of the spacing portion 25 is greater than the width of the notch 52.
In some embodiments, when a portion of the first magnetic steel slot 121 located radially outside the first magnetic steel 111 is a first hollow slot structure 1211, and an edge of the first hollow slot structure 1211, which meets the first magnetic steel 111, includes a first circular arc 41 and a second circular arc 42; the part of the second magnetic steel slot 122, which is located at the radial outer side of the second magnetic steel 112, is a second hollow slot structure 1221, and the side of the second hollow slot structure 1221, which is connected to the second magnetic steel 112, includes a third arc 41 'and a fourth arc 42',
and when the connection position of the first arc 41 and the second arc 42 and the central connection line of the rotor core 10 form a first central connection line 43, and the connection position of the third arc 41 ' and the fourth arc 42 ' and the central connection line of the rotor core 10 form a second central connection line 43 ':
the extension line of the first center connecting line 43 passes through the center of the slot 52 of the stator slot 51 opposite thereto, and the extension line of the second center connecting line 43' passes through the center of the slot 52 of the stator slot 51 opposite thereto.
In some embodiments, the number of slots circumferentially spaced between the position where the extension line of the first center connecting line 43 passes through the center of the slot opening of the stator slot 51 opposite thereto and the position where the extension line of the second center connecting line 43' passes through the center of the slot opening of the stator slot 51 opposite thereto is Q/(2p) -1, where Q is the total number of slots of the stator and p is the number of pole pairs.
The invention also makes the connecting point of two sections of circular arcs of one magnetic steel slot pass through the center of the stator slot, and the connecting point of two sections of circular arcs of the other magnetic steel slot symmetrical to the connecting point of two sections of circular arcs of the rotor pass through the center of the stator slot, and the circumferential spacing slot number between the two centers is Q/(2p) -1, thus effectively making the connecting point of two sections of circular arcs in the center of the stator slot, enabling the magnetic lines of force entering the rotor from two adjacent stator teeth to have a uniform transition, reducing the change of electromagnetic force, forming the magnetic barrier structure of the rotor pole arc, and reducing the electromagnetic excitation force and torque pulsation of the motor without affecting the output performance of the motor, thereby reducing the noise of the motor.
The invention also provides an electric automobile which comprises the motor.
Those skilled in the art will readily appreciate that the advantageous features of the above described modes can be freely combined, superimposed and combined without conflict.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention. The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, it is possible to make various improvements and modifications without departing from the technical principle of the present invention, and those improvements and modifications should be also considered as the protection scope of the present invention.
Claims (19)
1. An electric machine rotor, comprising: rotor core (10), be provided with magnet steel groove (12) and two at least magnetic barrier grooves (21) on rotor core (10), and two magnetic barrier groove (21) for the D axial symmetry of rotor core (10) sets up, two magnetic barrier groove (21) are located magnet steel groove (12) with position between the radial outer fringe of rotor core (10), just magnetic barrier groove (21) not meet with radial outer fringe, the cross section of magnetic barrier groove (21) is the rectangular channel, and can press from both sides the angle between 0 ~ 180 degree between the extension line of the long limit of two rectangular channels towards radial inboard for the opening of the contained angle that forms between the extension line of the long limit of two radial inboard faces the center of rotor core (10), forms the magnetic barrier structure of "anti-V-arrangement".
2. The electric machine rotor of claim 1, wherein:
the magnetic steel grooves (12) comprise a first magnetic steel groove (121) and a second magnetic steel groove (122), and the first magnetic steel groove (121) and the second magnetic steel groove (122) are also symmetrically arranged relative to the D axis; the two magnetic barrier grooves (21) comprise a first magnetic barrier groove (211) and a second magnetic barrier groove (212), the first magnetic barrier groove (211) is opposite to the first magnetic steel groove (121) and is located at a position between the first magnetic steel groove (121) and the radial outer edge of the rotor core (10), and the second magnetic barrier groove (212) is opposite to the second magnetic steel groove (122) and is located at a position between the second magnetic steel groove (122) and the radial outer edge of the rotor core (10).
3. The electric machine rotor of claim 2, wherein:
the magnetic steel groove structure further comprises magnetic steel (11), and the magnetic steel (11) is arranged in the magnetic steel groove (12);
magnet steel (11) including set up in first magnet steel (111) in first magnet steel groove (121) with set up in second magnet steel (112) in second magnet steel groove (122), first magnet steel (111) with second magnet steel (112) are the rectangle structure.
4. The electric machine rotor of claim 3, wherein:
the first magnetic barrier groove (211) and the second magnetic barrier groove (212) are rectangular grooves, the edge, opposite to the second magnetic barrier groove (212), of the first magnetic barrier groove (211) is a first short edge (2111), the edge, opposite to the first magnetic barrier groove (211), of the second magnetic barrier groove (212) is a second short edge (2121), the extension line of the first short edge (2111) passes through one vertex of the rectangle of the first magnetic steel (111), and the extension line of the second short edge (2121) passes through one vertex of the rectangle of the second magnetic steel (112).
5. The electric machine rotor of claim 4, wherein:
the extension line of the first short side (2111) passes through one vertex of the rectangle of the first magnetic steel (111) which is closest to the D axis, and the extension line of the second short side (2121) passes through one vertex of the rectangle of the second magnetic steel (112) which is closest to the D axis.
6. The electric machine rotor of claim 3, wherein:
first magnetic barrier groove (211) with second magnetic barrier groove (212) are the rectangular channel, first magnetic barrier groove (211) on with second magnetic barrier groove (212) apart from the limit farthest is third minor face (2112), on second magnetic barrier groove (212) with first magnetic barrier groove (211) apart from the limit farthest is fourth minor face (2122), the extension line of third minor face (2112) passes through a long limit of the rectangle of first magnet steel (111), the extension line of fourth minor face (2122) passes through a long limit of the rectangle of second magnet steel (112).
7. The electric machine rotor of claim 6, wherein:
the extension line of the third short side (2112) passes through the long side of the rectangle of the first magnetic steel (111) and is the long side located on the radial inner side, and the extension line of the fourth short side (2122) passes through the long side of the rectangle of the second magnetic steel (112) and is the long side located on the radial inner side.
8. An electric machine rotor as claimed in any of claims 1-7, characterized in that:
the range of the long side of the rectangular magnetic barrier groove (21) is 10-12 mm; the range of the short side of the rectangular magnetic barrier groove (21) is 1.5-2 mm.
9. An electric machine rotor as claimed in any of claims 3-8, characterized in that:
the part, located on the radial outer side of the first magnetic steel (111), of the first magnetic steel groove (121) is a first hollow groove structure (1211), and the side, connected with the first magnetic steel (111), of the first hollow groove structure (1211) comprises a first arc (41) and a second arc (42); the second magnet steel groove (122) is located the part in the radial outside of second magnet steel (112) is second hollow groove structure (1221), just the second hollow groove structure (1221) with the limit that second magnet steel (112) meets includes third circular arc (41 ') and fourth circular arc (42').
10. The electric machine rotor of claim 9, wherein:
the first arc (41) and the second arc (42) are located on a radially outer side of the first hollow slot structure (1211), and the third arc (41 ') and the fourth arc (42') are located on a radially outer side of the second hollow slot structure (1221).
11. The electric machine rotor of claim 9, wherein:
one end of the first circular arc (41) is connected with one vertex of the first magnetic steel (111), the other end of the first circular arc extends to be connected with one end of the second circular arc (42), the arc radius of the first circular arc (41) is R1, the arc radius of the second circular arc (42) is R2, and R1 is more than R2;
one end of the third circular arc (41 ') is connected with one vertex of the second magnetic steel (112), the other end extends to be connected with one end of the fourth circular arc (42'), the arc radius of the third circular arc (41 ') is R1, the arc radius of the fourth circular arc (42') is R2, and R1 is smaller than R2.
12. The electric machine rotor of claim 11, wherein:
r1 is 5-7 mm, R2 is 25-30 mm.
13. The electric machine rotor of claim 9, wherein:
the first hollow groove structure (1211) further comprises a first straight line section (44), a second straight line section (45) and a third straight line section (46), one end of the first straight line section (44) is connected with the other end of the second circular arc (42) and is a tangent extension line at the other end of the second circular arc (42), the second straight line section (45) is connected with the other end of the first straight line section (44), the second straight line section (45) and the third straight line section (46) are sequentially connected, and the third straight line section (46) is connected with the first magnetic steel (111);
the second hollow groove structure (1221) further comprises a fourth straight line segment (44 '), a fifth straight line segment (45 ') and a sixth straight line segment (46 '), one end of the fourth straight line segment (44 ') is connected with the other end of the fourth circular arc (42 ') and is a tangent extension line at the other end of the fourth circular arc (42 '), the fifth straight line segment (45 ') is connected with the other end of the fourth straight line segment (44 '), the fifth straight line segment (45 ') and the sixth straight line segment (46 ') are sequentially connected, and the sixth straight line segment (46 ') is connected with the second magnetic steel (112).
14. The electric machine rotor of claim 9, wherein:
the connecting position of the first circular arc (41) and the second circular arc (42) and the central connecting line of the rotor core (10) form a first central connecting line (43), the connecting position of the third circular arc (41 ') and the fourth circular arc (42') and the central connecting line of the rotor core (10) form a second central connecting line (43 '), and an included angle (49) is formed between the first central connecting line (43) and the second central connecting line (43').
15. An electric machine characterized by: an electric machine rotor comprising any of claims 1-14, further comprising an electric machine stator (5), said electric machine stator (5) being located at the outer circumference of said electric machine rotor.
16. The electric machine of claim 15, wherein: the motor stator (5) comprises stator slots (51) which are sequentially arranged at intervals along the circumferential direction, when the two magnetic barrier slots (21) comprise a first magnetic barrier slot (211) and a second magnetic barrier slot (212), the edge, opposite to the second magnetic barrier slot (212), of the first magnetic barrier slot (211) is a first short edge (2111), and the edge, opposite to the first magnetic barrier slot (211), of the second magnetic barrier slot (212) is a second short edge (2121):
a spacing portion (25) is formed between the first short side (2111) and the second short side (2121), a notch (52) of the stator slot (51) is opposite to the spacing portion (25), and the width of the spacing portion (25) is greater than the width of the notch (52).
17. The electric machine of claim 16, wherein:
when the part of the first magnetic steel groove (121) located at the radial outer side of the first magnetic steel (111) is a first hollow groove structure (1211), the side of the first hollow groove structure (1211) connected with the first magnetic steel (111) comprises a first arc (41) and a second arc (42); the part of the second magnetic steel groove (122) which is positioned at the radial outer side of the second magnetic steel (112) is a second hollow groove structure (1221), the edge of the second hollow groove structure (1221) connected with the second magnetic steel (112) comprises a third circular arc (41 ') and a fourth circular arc (42'),
and when the connecting position of the first circular arc (41) and the second circular arc (42) forms a first center connecting line (43) with the center connecting line of the rotor core (10), and the connecting position of the third circular arc (41 ') and the fourth circular arc (42 ') forms a second center connecting line (43 ') with the center connecting line of the rotor core (10):
an extension line of the first center connecting line (43) passes through a center of the notch (52) of the stator slot (51) opposite thereto, and an extension line of the second center connecting line (43') passes through a center of the notch (52) of the stator slot (51) opposite thereto.
18. The electric machine of claim 17, wherein:
the number of slots which are circumferentially spaced between the position where the extension line of the first center connecting line (43) passes through the center of the notch of the stator slot (51) opposite to the first center connecting line and the position where the extension line of the second center connecting line (43') passes through the center of the notch of the stator slot (51) opposite to the second center connecting line is Q/(2p) -1, wherein Q is the total number of slots of the stator, and p is the number of pole pairs.
19. An electric vehicle, characterized in that: comprising an electrical machine according to any of claims 15-18.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210687771.7A CN115001178A (en) | 2022-06-17 | 2022-06-17 | Motor rotor, motor and electric automobile |
| PCT/CN2022/140703 WO2023240970A1 (en) | 2022-06-17 | 2022-12-21 | Motor rotor, motor, and electric vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210687771.7A CN115001178A (en) | 2022-06-17 | 2022-06-17 | Motor rotor, motor and electric automobile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115001178A true CN115001178A (en) | 2022-09-02 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210687771.7A Pending CN115001178A (en) | 2022-06-17 | 2022-06-17 | Motor rotor, motor and electric automobile |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN115001178A (en) |
| WO (1) | WO2023240970A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023240970A1 (en) * | 2022-06-17 | 2023-12-21 | 珠海格力电器股份有限公司 | Motor rotor, motor, and electric vehicle |
| WO2024078117A1 (en) * | 2022-10-14 | 2024-04-18 | 广东美芝制冷设备有限公司 | Motor rotor having flux barriers, motor and compressor |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118449302A (en) * | 2024-07-08 | 2024-08-06 | 广东美芝制冷设备有限公司 | Rotor, motor and compressor |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007127658A2 (en) * | 2006-04-25 | 2007-11-08 | A.O. Smith Corporation | Rotor having lobed bore and method of assembling same |
| CN207117335U (en) * | 2017-08-24 | 2018-03-16 | 智车优行科技（上海）有限公司 | Built-in permanent magnet motor rotor and magneto |
| CN208028677U (en) * | 2018-03-29 | 2018-10-30 | 广东美芝制冷设备有限公司 | Rotor core, motor, compressor and refrigeration equipment |
| CN214506702U (en) * | 2021-04-30 | 2021-10-26 | 美的威灵电机技术（上海）有限公司 | Rotor, motor and compressor |
| CN113315283A (en) * | 2021-05-27 | 2021-08-27 | 珠海格力电器股份有限公司 | Rotor, motor and automobile |
| CN115001178A (en) * | 2022-06-17 | 2022-09-02 | 珠海格力电器股份有限公司 | Motor rotor, motor and electric automobile |
-
2022
- 2022-06-17 CN CN202210687771.7A patent/CN115001178A/en active Pending
- 2022-12-21 WO PCT/CN2022/140703 patent/WO2023240970A1/en unknown
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023240970A1 (en) * | 2022-06-17 | 2023-12-21 | 珠海格力电器股份有限公司 | Motor rotor, motor, and electric vehicle |
| WO2024078117A1 (en) * | 2022-10-14 | 2024-04-18 | 广东美芝制冷设备有限公司 | Motor rotor having flux barriers, motor and compressor |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2023240970A1 (en) | 2023-12-21 |
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