CN107994703B - Motor rotor and permanent magnet motor - Google Patents
Motor rotor and permanent magnet motor Download PDFInfo
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- CN107994703B CN107994703B CN201711388512.XA CN201711388512A CN107994703B CN 107994703 B CN107994703 B CN 107994703B CN 201711388512 A CN201711388512 A CN 201711388512A CN 107994703 B CN107994703 B CN 107994703B
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- 230000005389 magnetism Effects 0.000 claims abstract description 84
- 238000002955 isolation Methods 0.000 claims description 26
- 230000004888 barrier function Effects 0.000 claims description 23
- 238000009434 installation Methods 0.000 claims description 19
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 238000007885 magnetic separation Methods 0.000 claims 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 abstract description 3
- 239000010959 steel Substances 0.000 abstract description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 230000010349 pulsation Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Classifications
-
- 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]
- H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
-
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The invention provides a motor rotor and a permanent magnet motor. The motor rotor comprises a rotor core (1) and a plurality of magnetic poles arranged in the rotor core (1), wherein each magnetic pole comprises a first permanent magnet (2) and a second permanent magnet (3), the coercive force of the first permanent magnet (2) is higher than that of the second permanent magnet (3), and a first magnetism isolating groove (4) used for isolating the first permanent magnet (2) from the second permanent magnet (3) and guiding the trend of a magnetic field is arranged between the first permanent magnet (2) and the second permanent magnet (3). According to the motor rotor, the magnetic steel magnetizing and demagnetizing difficulty can be effectively reduced, and the motor efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of motors, and particularly relates to a motor rotor and a permanent magnet motor.
Background
The traditional permanent magnet motor provides magnetic flux by means of the permanent magnet, but the permanent magnet provides magnetic field fixing, and the internal magnetic field of the motor is difficult to adjust, so that the efficiency of the permanent magnet motor in high frequency and low frequency is difficult to achieve. And the highest operating frequency of the motor is limited under the condition of fixed power supply voltage.
At present, most of the defects that the internal magnetic field of a permanent magnet motor is difficult to adjust lead to the fact that the highest rotating speed of the motor is limited by factors such as the voltage of an input direct current bus, the efficiency of a low-speed and high-speed operation area of the motor is difficult to consider, and the like.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to provide the motor rotor and the permanent magnet motor, which can effectively reduce the difficulty of magnetic steel magnetizing and demagnetizing and improve the motor efficiency.
In order to solve the problems, the invention provides a motor rotor, which comprises a rotor core and a plurality of magnetic poles arranged in the rotor core, wherein the magnetic poles comprise a first permanent magnet and a second permanent magnet, the coercive force of the first permanent magnet is higher than that of the second permanent magnet, and a first magnetism isolating groove for isolating the first permanent magnet from the second permanent magnet and guiding the trend of a magnetic field is arranged between the first permanent magnet and the second permanent magnet.
Preferably, a mounting gap is arranged between the first permanent magnet and the second permanent magnet, and the first magnetism isolating slot is connected with the mounting gap and extends in a direction away from the mounting gap.
Preferably, on the cross section of the rotor core, the first magnetism isolating slot includes a first slot section and a second slot section, the first slot section is connected with the installation gap, the second slot section is connected at one side of the first slot section far away from the installation gap, and the width of the second slot section is larger than that of the first slot section.
Preferably, the width L1 of the first slot segment is δ -3×δ, δ being the motor single-sided air gap length; and/or the width L2 of the second groove section is 1.5×l1 to 4×l1; and/or the included angle theta 1 between the first magnetism isolating groove and the first permanent magnet is 55-110 degrees.
Preferably, on the cross section of the rotor core, the second permanent magnet is located on the outer peripheral side of the first permanent magnet, and the rotor core is further provided with a second magnetism isolating slot in an area surrounded by the second permanent magnet and the first magnetism isolating slot.
Preferably, the minimum distance L3 between the second magnetism isolating slot and the second permanent magnet is δ -2.5×δ; and/or the second magnetism isolating slot comprises a first side edge close to the first magnetism isolating slot and a second side edge far away from the first magnetism isolating slot, the first side edge and the second side edge are oppositely arranged, the distance L4 between the first side edge and the second side edge is 1mm+0.8δ -1 mm+1.5δ, and δ is the single-side air gap length of the motor.
Preferably, the rotor core is further provided with a third magnetism isolating slot provided at a side of the installation gap away from the first magnetism isolating slot and extending in a direction away from the installation gap.
Preferably, the width of the third magnetism isolating slot increases in a direction away from the installation gap in a cross section of the rotor core; and/or, along the direction far away from the installation gap, the third magnetism isolating slot extends to the edge of the second permanent magnet; and/or, the distance between the third magnetism isolating slot and the edge of one side of the second permanent magnet and the maximum width L5 of the second permanent magnet is delta-3.5 x delta, and delta is the length of a unilateral air gap of the motor.
Preferably, each pole comprises two first permanent magnets and two second permanent magnets, the two first permanent magnets being symmetrically arranged about the motor d-axis of the pole and the two second permanent magnets being symmetrically arranged about the motor d-axis of the pole.
Preferably, the distance L6 between two adjacent second permanent magnets located at different magnetic poles is 0.4+0.2×δ to 0.4+1.2×δ, δ being the motor single-sided air gap length.
Preferably, on the cross section of the rotor core, the second permanent magnet is located at the outer peripheral side of the first permanent magnet, and in the area surrounded by the first permanent magnet and the first magnetism isolating slot, the rotor core is further provided with a fourth magnetism isolating slot and/or a fifth magnetism isolating slot.
Preferably, the widths of the fourth magnetic isolation groove and the fifth magnetic isolation groove are the same, the width L7 of the fourth magnetic isolation groove and the fifth magnetic isolation groove is 0.8-2 delta, and delta is the length of a single-side air gap of the motor; and/or the included angle between the fourth magnetism isolating slot and the adjacent fifth magnetism isolating slot is 5 degrees plus pi/(6*p) to 5 degrees plus pi/(3*p), and p is the number of magnetic pole pairs.
Preferably, the rotor core is further provided with a magnetic barrier between the two first permanent magnets of different poles.
Preferably, on the cross section of the rotor core, the magnetic barrier is an arc-shaped groove, and the circle center of the arc-shaped groove is positioned on the outer circle of the rotor core; and/or the radial width L8 of the magnetic barrier is 1.5-5; and/or a plurality of magnetic barriers are arranged at intervals along the radial direction of the rotor core, and the radial magnetic bridge width L9 between adjacent magnetic barriers is 2-6; delta is the length of a single-side air gap of the motor.
Preferably, the coercive force of the first permanent magnet is 8 times or more that of the second permanent magnet.
According to another aspect of the present invention, there is provided a permanent magnet motor comprising a motor rotor as described above.
The motor rotor comprises a rotor core and a plurality of magnetic poles arranged in the rotor core, wherein each magnetic pole comprises a first permanent magnet and a second permanent magnet, the coercive force of the first permanent magnet is higher than that of the second permanent magnet, and a first magnetism isolating groove for isolating the first permanent magnet from the second permanent magnet and guiding the trend of a magnetic field is arranged between the first permanent magnet and the second permanent magnet. Because the first magnetism isolating slot for isolating the first permanent magnet from the second permanent magnet and guiding the trend of the magnetic field is arranged between the first permanent magnet and the second permanent magnet, the influence of the permanent magnet with higher coercive force on the permanent magnet with lower coercive force can be effectively reduced by the motor rotor through the first magnetism isolating slot; the trend of the magnetic field is guided through the first magnetism isolating groove, so that the magnetizing and demagnetizing difficulty of the permanent magnet with low coercive force is reduced; the rotor magnetic field distribution is changed, the motor air gap magnetic field is optimized, the motor air gap magnetic field distribution sine degree is better, and the motor efficiency is improved.
Drawings
Fig. 1 is a structural view of one magnetic pole of a motor rotor according to an embodiment of the present invention;
fig. 2 is a schematic structural view of a motor rotor according to an embodiment of the present invention;
fig. 3 is an enlarged schematic view of the structure at P of fig. 2;
fig. 4 is a schematic view of a magnetic pole structure of another embodiment of a motor rotor according to an embodiment of the present invention;
FIG. 5 is a dimensional block diagram of a fourth and fifth magnetically isolated slots of the motor rotor of FIG. 4;
fig. 6 is a dimensional block diagram of a motor rotor according to an embodiment of the present invention.
The reference numerals are expressed as:
1. A rotor core; 2. a first permanent magnet; 3. a second permanent magnet; 4. a first magnetism isolating slot; 5. a mounting gap; 6. a first trough section; 7. a second trough section; 8. a second magnetism isolating slot; 9. a first side; 10. a second side; 11. a third magnetism isolating slot; 12. a fourth magnetism isolating slot; 13. a fifth magnetism isolating slot; 14. a magnetic barrier; 15. and a sixth magnetism isolating slot.
Detailed Description
Referring to fig. 1 to 6 in combination, according to an embodiment of the present invention, a motor rotor includes a rotor core 1 and a plurality of magnetic poles provided in the rotor core 1, the magnetic poles including a first permanent magnet 2 and a second permanent magnet 3, the coercive force of the first permanent magnet 2 being higher than that of the second permanent magnet 3, a first magnetism blocking groove 4 for separating the first permanent magnet 2 and the second permanent magnet 3 and guiding the trend of a magnetic field being provided between the first permanent magnet 2 and the second permanent magnet 3.
Because the first magnetism isolating slot 4 for isolating the first permanent magnet 2 from the second permanent magnet 3 and guiding the trend of the magnetic field is arranged between the first permanent magnet 2 and the second permanent magnet 3, the influence of the permanent magnet with higher coercive force on the permanent magnet with lower coercive force can be effectively reduced by the motor rotor through the first magnetism isolating slot 4; the trend of the magnetic field is guided through the first magnetism isolating groove 4, so that the magnetizing and demagnetizing difficulty of the permanent magnet with low coercive force is reduced; the rotor magnetic field distribution is changed, the motor air gap magnetic field is optimized, the motor air gap magnetic field distribution sine degree is better, and the motor efficiency is improved.
Preferably, a mounting gap 5 is provided between the first permanent magnet 2 and the second permanent magnet 3, and the first magnetism isolating slot 4 is connected to the mounting gap 5 and extends in a direction away from the mounting gap 5. The installation gap 5 is located between the end of the first permanent magnet 2 facing the second permanent magnet 3 and the end of the second permanent magnet 3 facing the first permanent magnet 2, and is used for forming an isolation gap, so as to avoid direct contact between the first permanent magnet 2 and the second permanent magnet 3. The first magnetism isolating slot 4 is connected with the installation gap 5 and extends towards the d axis of the motor along the direction away from the installation gap 5, so that the first magnetism isolating slot 4 can better separate the first permanent magnet 2 from the second permanent magnet 3, and meanwhile, the d axis magnetic field of the motor can be guided to charge and demagnetize the second permanent magnet 3, and the charging and demagnetizing current during the magnetic regulation of the motor is reduced.
Preferably, on the cross section of the rotor core 1, the first magnetism isolating slot 4 includes a first slot section 6 and a second slot section 7, the first slot section 6 is connected with the installation gap 5, the second slot section 7 is connected at one side of the first slot section 6 away from the installation gap 5, and the width of the second slot section 7 is larger than that of the first slot section 6, so that the influence of the first permanent magnet 2 on the second permanent magnet 3 during the operation of the motor is reduced, and the magnetic circuit of the second permanent magnet 3 is not influenced.
Preferably, the width L1 of the first slot segment 6 is δ -3×δ, δ is the length of the single-sided air gap of the motor, so as to ensure that the magnetic resistance is larger than the air gap and reduce the magnetic leakage of the first slot segment 6.
Preferably, the width L2 of the second slot segment 7 is 1.5×l1 to 4×l1, so as to effectively isolate the influence of the first permanent magnet 2 on the second permanent magnet 3.
Preferably, the included angle theta 1 between the first magnetism isolating slot 4 and the first permanent magnet 2 is 55 degrees to 110 degrees.
Preferably, the second permanent magnet 3 is located at the outer peripheral side of the first permanent magnet 2 on the cross section of the rotor core 1, and the rotor core 1 is further provided with a second magnetism isolating slot 8 in the area surrounded by the second permanent magnet 3 and the first magnetism isolating slot 4, so that the influence of the first permanent magnet 2 with high coercive force on the second permanent magnet 3 with low coercive force is reduced in normal operation. Because the second magnetism isolating slot 8 is positioned in the area surrounded by the second permanent magnet 3 and the first magnetism isolating slot 4, magnetism isolating effect can be formed through the second magnetism isolating slot 8, so that influence of the first permanent magnet 2 with higher coercive force on the second permanent magnet 3 with lower coercive force is further reduced, and the magnetizing and demagnetizing difficulty of the second permanent magnet 3 with lower coercive force is reduced.
Preferably, the minimum distance L3 between the second magnetism isolating slot 8 and the second permanent magnet 3 is δ -2.5×δ, so that the influence of the first permanent magnet 2 on the second permanent magnet 3 can be isolated under the condition that the magnetic circuit of the second permanent magnet 3 is not influenced after magnetism adjustment; and/or, the second magnetic isolation groove 8 comprises a first side edge 9 close to the first magnetic isolation groove 4 and a second side edge 10 far away from the first magnetic isolation groove 4, the first side edge 9 and the second side edge 10 are oppositely arranged, the distance L4 between the first side edge 9 and the second side edge 10 is 1 mm+0.8-1 mm+1.5, and delta is the single-side air gap length of the motor.
Preferably, the rotor core 1 is further provided with a third magnetism isolating slot 11, the third magnetism isolating slot 11 being provided at a side of the installation gap 5 away from the first magnetism isolating slot 4 and extending in a direction away from the installation gap 5. Through setting up third magnetism isolating slot 11, can lengthen the mounting groove length of second permanent magnet 3 to increase motor q axle magnetic resistance, increase the magnetic bridge length between two first permanent magnets 2, reduce q axle inductance, promote the efficiency when motor Id=0 control, promote the efficiency when motor normal operating, can reduce the influence of first permanent magnet 2 to second permanent magnet 3 simultaneously, in addition, set up longer narrow magnetic bridge and can reduce the magnetic leakage.
Preferably, the width of the third magnetism isolating slot 11 increases in a direction away from the installation gap 5 in the cross section of the rotor core 1; and/or, in a direction away from the mounting gap 5, the third magnetically isolated slot 11 extends to the edge of the second permanent magnet 3; and/or, the maximum width L5 of the third magnetism isolating slot 11 away from the side edge of the second permanent magnet 3 and away from the second permanent magnet 3 is delta-3.5×delta, and delta is the single-side air gap length of the motor.
Preferably, each pole comprises two first permanent magnets 2 and two second permanent magnets 3, the two first permanent magnets 2 being arranged symmetrically about the motor d-axis of the pole and the two second permanent magnets 3 being arranged symmetrically about the motor d-axis of the pole. Wherein two first permanent magnets 2 positioned in the same magnetic pole are arranged in a V shape, so that the arrangement positions of the permanent magnets can be increased. The second permanent magnet 3 is tangentially arranged at the q-axis position, so that the second permanent magnet 3 is positioned on the d-axis magnetic path of the motor, the motor is convenient to charge and demagnetize, and the influence on the sine degree of the air gap flux density under each pole of the motor can be reduced.
Preferably, the distance L6 between two adjacent second permanent magnets 3 located at different magnetic poles is 0.4+0.2-0.4+1.2- δ, δ is the single-side air gap length of the motor, and a reasonable L6 range is set, so that not only can certain mechanical strength be ensured, but also the magnetic leakage and the influence of the first permanent magnet 2 on the second permanent magnets 3 can be reduced.
Preferably, the second permanent magnet 3 is located on the outer peripheral side of the first permanent magnet 2 in the cross section of the rotor core 1, and the rotor core 1 is further provided with fourth and/or fifth magnetism isolating grooves 12 and 13 in the region surrounded by the first permanent magnet 2 and the first magnetism isolating groove 4. By arranging the fourth magnetism isolating slot 12 and/or the fifth magnetism isolating slot 13, the trend of the magnetic field in the rotor can be guided, the magnetic field distribution is optimized, and the torque pulsation of the motor is reduced.
Preferably, the widths of the fourth magnetic isolation slot 12 and the fifth magnetic isolation slot 13 are the same, the width L7 of the fourth magnetic isolation slot 12 and the fifth magnetic isolation slot 13 is 0.8-2 delta, and delta is the length of a single-side air gap of the motor; and/or the included angle between the fourth magnetism isolating slot 12 and the adjacent fifth magnetism isolating slot 13 is 5 degrees plus pi/(6*p) to 5 degrees plus pi/(3*p), and p is the magnetic pole pair number. Through the mutual cooperation of the fourth magnetism isolating slot 12 and the fifth magnetism isolating slot 13, the internal magnetic field structure of the rotor can be optimized, the torque pulsation of the motor is reduced, and the running efficiency of the motor is improved.
In the present embodiment, the sixth magnetism isolating slot 15 extending along the motor d-axis is provided on the motor d-axis, the fourth magnetism isolating slot 12 and the fifth magnetism isolating slot 13 are provided between the first magnetism isolating slot 4 and the sixth magnetism isolating slot 15, the fourth magnetism isolating slot 12 is provided close to the sixth magnetism isolating slot 15 with respect to the fifth magnetism isolating slot 13, and the fifth magnetism isolating slot 13 is provided between the fourth magnetism isolating slot 12 and the first magnetism isolating slot 4. The angles between the fourth magnetic isolation groove 12, the fifth magnetic isolation groove 13, and the first magnetic isolation groove 4 and the d axis of the motor are gradually increased along the direction away from the sixth magnetic isolation groove 15.
Preferably, two fourth magnetic isolation grooves 12 and two fifth magnetic isolation grooves 13 are included in the same magnetic pole, one fourth magnetic isolation groove 12 and one fifth magnetic isolation groove 13 positioned at the first side of the sixth magnetic isolation groove 15 are axisymmetric with the other fourth magnetic isolation groove 12 and the other fifth magnetic isolation groove 13 positioned at the second side of the sixth magnetic isolation groove 15 with respect to the motor d.
Preferably, the rotor core 1 is also provided with a magnetic barrier 14, the magnetic barrier 14 being located between two first permanent magnets 2 of different poles. By providing a magnetic barrier 14 between two adjacent first permanent magnets 2, the q-axis reluctance can be increased, improving the efficiency of the motor when operating at id=0.
Preferably, on the cross section of the rotor core 1, the magnetic barrier 14 is an arc-shaped groove, and the circle center of the arc-shaped groove is positioned on the outer circle of the rotor core 1; and/or the radial width L8 of the magnetic barrier 14 is 1.5-5; and/or, the magnetic barriers 14 are arranged at intervals along the radial direction of the rotor core 1, and the radial magnetic bridge width L9 between the adjacent magnetic barriers 14 is 2-6 delta; delta is the length of a single-side air gap of the motor. Specifically, in the present embodiment, the number of the magnetic barriers 14 is three, and the angular bisectors of the three magnetic barriers 14 coincide. The three magnetic barriers 14 may be arranged at even intervals or may be arranged at uneven intervals. Preferably, the angular bisector of the magnetic barrier 14 is the motor q-axis.
Preferably, the coercive force of the first permanent magnet 2 is 8 times or more that of the second permanent magnet 3.
The permanent magnet is, for example, magnetic steel.
According to an embodiment of the invention, the permanent magnet motor comprises a motor rotor, which is the motor rotor described above.
It will be readily appreciated by those skilled in the art that the above advantageous ways can be freely combined and superimposed without conflict.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention. The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present invention, and these modifications and variations should also be regarded as the scope of the invention.
Claims (14)
1. The motor rotor is characterized by comprising a rotor core (1) and a plurality of magnetic poles arranged in the rotor core (1), wherein each magnetic pole comprises a first permanent magnet (2) and a second permanent magnet (3), the coercive force of the first permanent magnet (2) is higher than that of the second permanent magnet (3), and a first magnetism isolating groove (4) used for isolating the first permanent magnet (2) from the second permanent magnet (3) and guiding the trend of a magnetic field is arranged between the first permanent magnet (2) and the second permanent magnet (3); an installation gap (5) is arranged between the first permanent magnet (2) and the second permanent magnet (3), and the first magnetism isolating groove (4) is connected with the installation gap (5) and extends in a direction away from the installation gap (5); on the cross section of the rotor core (1), the first magnetism isolating slot (4) comprises a first slot section (6) and a second slot section (7), the first slot section (6) is connected with the installation gap (5), the second slot section (7) is connected to one side, far away from the installation gap (5), of the first slot section (6), and the width of the second slot section (7) is larger than that of the first slot section (6); the width L1 of the first groove section (6) is delta-3 x delta, delta is the length of a single-side air gap of the motor, and the width L2 of the second groove section (7) is 1.5 x L1-4 x L1.
2. The electric motor rotor according to claim 1, characterized in that the angle θ1 between the first magnetically isolated groove (4) and the first permanent magnet (2) is 55 ° to 110 °.
3. The motor rotor according to claim 1, characterized in that the second permanent magnet (3) is located on the outer peripheral side of the first permanent magnet (2) in the cross section of the rotor core (1), and the rotor core (1) is further provided with a second magnetism isolating slot (8) in an area surrounded by the second permanent magnet (3) and the first magnetism isolating slot (4).
4. A motor rotor according to claim 3, characterized in that the minimum distance L3 between the second magnetically isolated slot (8) and the second permanent magnet (3) is δ -2.5 x δ; and/or, the second magnetism isolating slot (8) comprises a first side (9) close to the first magnetism isolating slot (4) and a second side (10) far away from the first magnetism isolating slot (4), the first side (9) and the second side (10) are oppositely arranged, a distance L4 between the first side (9) and the second side (10) is 1 mm+0.8-1 mm+1.5, and delta is the single-side air gap length of the motor.
5. The electric motor rotor as claimed in claim 1, characterized in that the rotor core (1) is further provided with a third magnetic shield groove (11), the third magnetic shield groove (11) being provided at a side of the mounting gap (5) remote from the first magnetic shield groove (4) and extending in a direction remote from the mounting gap (5).
6. -Electric motor rotor according to claim 5, characterised in that, in the cross section of the rotor core (1), the width of the third magnetic separation slot (11) increases in a direction away from the mounting gap (5); and/or, in a direction away from the mounting gap (5), the third magnetically isolated slot (11) extends to an edge of the second permanent magnet (3); and/or, the maximum width L5 of the third magnetism isolating slot (11) away from the edge of one side of the second permanent magnet (3) away from the second permanent magnet (3) is delta-3.5 x delta, and delta is the length of a single-side air gap of the motor.
7. The electric motor rotor according to claim 1, characterized in that each pole comprises two first permanent magnets (2) and two second permanent magnets (3), the two first permanent magnets (2) being arranged symmetrically with respect to the motor d-axis of the pole and the two second permanent magnets (3) being arranged symmetrically with respect to the motor d-axis of the pole.
8. An electric motor rotor according to claim 7, characterized in that the distance L6 between two adjacent second permanent magnets (3) located at different poles is 0.4+0.2-0.4+1.2 δ, δ being the motor single-sided air gap length.
9. An electric motor rotor according to claim 7, characterized in that the rotor core (1) is further provided with a magnetic barrier (14), the magnetic barrier (14) being located between two of the first permanent magnets (2) of different poles.
10. An electric motor rotor according to claim 9, characterized in that, in the cross section of the rotor core (1),
The magnetic barrier (14) is an arc-shaped groove, and the circle center of the arc-shaped groove is positioned on the outer circle of the rotor iron core (1); and/or the radial width L8 of the magnetic barrier (14) is 1.5-5; and/or a plurality of magnetic barriers (14) are arranged at intervals along the radial direction of the rotor core (1), and the radial magnetic bridge width L9 between the adjacent magnetic barriers (14) is 2-6 delta; delta is the length of a single-side air gap of the motor.
11. The electric motor rotor as claimed in claim 1, characterized in that the second permanent magnet (3) is located on the outer peripheral side of the first permanent magnet (2) in the cross section of the rotor core (1), and that the rotor core (1) is further provided with fourth and/or fifth magnetic separation grooves (12, 13) in the area enclosed by the first permanent magnet (2) and the first magnetic separation groove (4).
12. The electric machine rotor according to claim 11, characterized in that the fourth (12) and fifth (13) magnetic isolation grooves have the same width, the width L7 of the fourth (12) and fifth (13) magnetic isolation grooves being 0.8-2 δ, δ being the electric machine single-sided air gap length; and/or the included angle between the fourth magnetism isolating slot (12) and the adjacent fifth magnetism isolating slot (13) is 5 degrees plus pi/(6*p) to 5 degrees plus pi/(3*p), and p is the magnetic pole pair number.
13. The motor rotor according to any one of claims 1 to 12, characterized in that the coercive force of the first permanent magnet (2) is 8 times or more that of the second permanent magnet (3).
14. A permanent magnet electric machine comprising a machine rotor, characterized in that the machine rotor is the machine rotor according to any one of claims 1 to 13.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711388512.XA CN107994703B (en) | 2017-12-21 | 2017-12-21 | Motor rotor and permanent magnet motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711388512.XA CN107994703B (en) | 2017-12-21 | 2017-12-21 | Motor rotor and permanent magnet motor |
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| Publication Number | Publication Date |
|---|---|
| CN107994703A CN107994703A (en) | 2018-05-04 |
| CN107994703B true CN107994703B (en) | 2024-07-12 |
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| CN201711388512.XA Active CN107994703B (en) | 2017-12-21 | 2017-12-21 | Motor rotor and permanent magnet motor |
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| CN109067042A (en) * | 2018-09-20 | 2018-12-21 | 珠海凌达压缩机有限公司 | rotor and permanent magnet synchronous motor |
| CN109347229B (en) * | 2018-11-14 | 2024-05-14 | 珠海格力电器股份有限公司 | Motor rotor structure and permanent magnet motor |
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| CN109742878B (en) * | 2019-01-30 | 2021-07-02 | 广东工业大学 | Built-in permanent magnet synchronous motor and rotor structure thereof |
| DE102019105570A1 (en) * | 2019-03-05 | 2020-09-10 | Bayerische Motoren Werke Aktiengesellschaft | Rotor for a permanently excited electrical machine with a support structure |
| CN110401284B (en) * | 2019-08-02 | 2020-11-06 | 珠海格力电器股份有限公司 | Rotor assembly and permanent magnet motor |
| CN114094740B (en) * | 2020-07-31 | 2023-03-14 | 安徽威灵汽车部件有限公司 | Rotor punching sheet, rotor, motor and vehicle |
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