Rotor and motor having the same

Abstract

The present invention provides a rotor and a motor having the same. Among them, the rotor includes: a rotor core having a mounting hole, multiple groups of mounting portions and a first magnetic isolation groove. The mounting hole is used for mounting a rotating shaft, and the multiple groups of mounting portions are arranged at intervals along the circumferential direction of the mounting hole; along the radial direction of the rotor core, the first magnetic isolation groove is located between the mounting hole and the multiple groups of mounting portions; a plurality of first permanent magnets; wherein, each group of mounting portions includes at least two mounting grooves arranged at intervals along the circumferential direction of the rotor core, each mounting groove extends along the radial direction of the rotor core, and at least one first permanent magnet is arranged in each mounting groove; in two adjacent groups of mounting portions, the first permanent magnet arranged in one mounting groove of one group of mounting portions and the first permanent magnet arranged in another mounting groove adjacent to this mounting groove in the other group of mounting portions form a magnetic pole. The present invention effectively solves the problem of low motor efficiency in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular, to a rotor and a motor having the same. Background Art

[0002] Currently, due to the substantial price increase of metal materials, screw compressors are developing towards high power density and small volume. Therefore, developing screw compressors with high power density is the future development trend. Among them, the permanent magnet synchronous motors used in screw compressors usually adopt an internal permanent magnet structure, and the rotor provides excitation by magnetic steel. The greater the excitation provided by the rotor, the greater the output of the motor under the same current, and the higher the motor efficiency. However, the outer diameter and stack height dimensions of the rotor limit the magnetic field strength on the rotor side from increasing infinitely.

[0003] In the prior art, an enhanced magnetization internal tangential adjustable flux motor uses a single row of tangential magnetic steel, and magnetic isolation grooves are used on both sides of the magnetic steel to adjust the magnetic flux, thereby improving the motor efficiency. However, the adjustment degree of the above magnetic flux is limited, and the motor is prone to demagnetization, resulting in low motor efficiency. Summary of the Invention

[0004] The main object of the present invention is to provide a rotor and a motor having the same to solve the problem of low motor efficiency in the prior art.

[0005] To achieve the above object, according to one aspect of the present invention, there is provided a rotor, including: a rotor core having a mounting hole, a plurality of sets of mounting portions and a first magnetic isolation groove, the mounting hole being used for mounting a rotating shaft, the plurality of sets of mounting portions being circumferentially spaced along the mounting hole; in the radial direction of the rotor core, the first magnetic isolation groove is located between the mounting hole and the plurality of sets of mounting portions; a plurality of first permanent magnets; wherein each set of mounting portions includes at least two mounting grooves circumferentially spaced along the rotor core, each mounting groove extending in the radial direction of the rotor core, and at least one first permanent magnet is disposed in each mounting groove; in two adjacent sets of mounting portions, the first permanent magnet disposed in one mounting groove of one set of mounting portions and the first permanent magnet disposed in another mounting groove adjacent to the mounting groove in the other set of mounting portions form a magnetic pole.

[0006] Further, each mounting groove includes a plurality of sub-mounting grooves radially spaced along the rotor core, and the plurality of sub-mounting grooves are provided in one-to-one correspondence with the plurality of first permanent magnets.

[0007] Further, the rotor further includes a plurality of second permanent magnets, and the rotor core further has a plurality of auxiliary mounting portions circumferentially spaced along the mounting hole; wherein at least one auxiliary mounting portion is provided between two adjacent sets of mounting portions, and at least one second permanent magnet is disposed in each auxiliary mounting portion.

[0008] Furthermore, the rotor core further has a second magnetic isolation groove, and at least part of the second magnetic isolation groove is located between the auxiliary mounting portion and the mounting portion along the circumferential direction of the rotor core.

[0009] Furthermore, the second magnetic isolation groove includes: a first groove section, which is located between the auxiliary mounting portion and the mounting portion and extends along the radial direction of the rotor core; a second groove section, which is communicated with the first groove section and has the same extending direction as the adjacent first magnetic isolation groove.

[0010] Furthermore, at least one second magnetic isolation groove is provided on both sides of each second permanent magnet. The second groove section of the second magnetic isolation groove on one side penetrates the outer peripheral surface of the rotor core, and the second groove section of the second magnetic isolation groove on the other side is located inside the rotor core.

[0011] Furthermore, the rotor core further has a plurality of third magnetic isolation grooves, and the plurality of third magnetic isolation grooves are arranged at intervals along the circumferential direction and / or the radial direction of the rotor core; wherein, along the radial direction of the rotor core, at least part of the third magnetic isolation grooves are arranged between two adjacent sub-mounting grooves.

[0012] Furthermore, the third magnetic isolation groove includes: a third groove section, which is arranged between two adjacent sub-mounting grooves; a fourth groove section, which is communicated with the third groove section and is arranged at an angle with the third groove section, and the fourth groove section is located between the auxiliary mounting portion and the mounting portion adjacent to the auxiliary mounting portion.

[0013] Furthermore, the fourth groove section of one of the two adjacent third magnetic isolation grooves penetrates the outer peripheral surface of the rotor core, and the fourth groove section of the other third magnetic isolation groove is located inside the rotor core.

[0014] Furthermore, the third magnetic isolation groove adjacent to the second magnetic isolation groove penetrating the outer peripheral surface of the rotor core is located inside the rotor core; and / or, the third magnetic isolation groove adjacent to the second magnetic isolation groove located inside the rotor core penetrates the outer peripheral surface of the rotor core.

[0015] Furthermore, in two adjacent magnetic poles, along the circumferential direction of the rotor core, the fourth groove section of one of the two adjacent third magnetic isolation grooves penetrates the outer peripheral surface of the rotor core, and the fourth groove section of the other third magnetic isolation groove is located inside the rotor core.

[0016] Furthermore, along the direction from the central axis of the rotor core to the outer peripheral surface, the height H of each sub-mounting groove in each mounting groove m satisfies the following relationship: wherein, N is the number of sub-mounting grooves in each mounting groove, 3 ≤ N ≤ 5; m is the setting order of the sub-mounting grooves, and m ≤ N.

[0017] According to another aspect of the present invention, a motor is provided, which includes a stator and a rotor arranged inside the stator; wherein, the rotor is the above-mentioned rotor.

[0018] Applying the technical solution of the present invention, the rotor core has multiple sets of mounting parts. Each set of mounting parts includes at least two mounting grooves arranged at intervals along the circumferential direction of the rotor core, and at least one first permanent magnet is arranged in each mounting groove. The first magnetic isolation groove is located between the mounting hole and the multiple sets of mounting parts. In this way, two first permanent magnets are arranged along the circumferential direction of the rotor core in each magnetic pole, so that the q-axis inductance of the motor is significantly increased, and further the d-axis and q-axis inductance difference of the rotor is increased, making the reluctance torque effectively utilized. At the same time, through the above settings of the first magnetic isolation groove and the multiple first permanent magnets, the high magnetic concentration ability of the motor is increased, and further the field weakening ability of the motor is expanded, and the anti-demagnetization ability of the motor is increased, solving the problem of low motor efficiency in the prior art and improving the motor efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0020] Figure 1 A three-dimensional structural schematic diagram of an embodiment of a rotor according to the present invention is shown;

[0021] Figure 2 Shown is Figure 1 a schematic diagram of the A surface structure of the rotor in

[0022] Figure 3 Shown is Figure 1 a schematic diagram of the B surface structure of the rotor in

[0023] Figure 4 Shown is Figure 1 a schematic diagram of the structure of one magnetic pole of the rotor in

[0024] Figure 5 a schematic diagram of a matrix-type permanent magnet single-row structure; and

[0025] Figure 6 a curve graph showing the influence of the number of rows n and the radial quantity of the matrix-type permanent magnet on the motor efficiency.

[0026] Among them, the above-mentioned accompanying drawings include the following reference numerals:

[0027] 10. Rotor core; 11. Mounting hole; 12. Mounting part; 121. Mounting groove; 1211. Sub-mounting groove; 13. First magnetic isolation groove; 14. Auxiliary mounting part; 15. Second magnetic isolation groove; 151. First groove section; 152. Second groove section; 16. Third magnetic isolation groove; 161. Third groove section; 162. Fourth groove section; 20. Rotating shaft; 30. First permanent magnet; 40. Second permanent magnet. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0029] It should be pointed out that, unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0030] In the present invention, unless otherwise stated, the orientation terms such as "upper, lower" are generally in reference to the directions shown in the drawings, or in the vertical, perpendicular or gravitational directions; similarly, for ease of understanding and description, "left, right" are generally in reference to the left and right shown in the drawings; "inner, outer" refer to the inner and outer of the contour of each component itself, but the above orientation terms are not used to limit the present invention.

[0031] In order to solve the problem of low motor efficiency in the prior art, the present application provides a rotor and a motor having the same.

[0032] As Figures 1 to 5 shown, the rotor includes a rotor core 10 and a plurality of first permanent magnets 30. The rotor core 10 has a mounting hole 11, a plurality of sets of mounting portions 12 and a first magnetic isolation groove 13. The mounting hole 11 is used for mounting a rotating shaft 20, and the plurality of sets of mounting portions 12 are arranged at intervals along the circumference of the mounting hole 11. In the radial direction of the rotor core 10, the first magnetic isolation groove 13 is located between the mounting hole 11 and the plurality of sets of mounting portions 12. Each set of mounting portions 12 includes at least two mounting grooves 121 arranged at intervals along the circumference of the rotor core 10, each mounting groove 121 extends in the radial direction of the rotor core 10, and at least one first permanent magnet 30 is arranged in each mounting groove 121. In two adjacent sets of mounting portions 12, the first permanent magnet 30 arranged in one mounting groove 121 of one set of mounting portions 12 and the first permanent magnet 30 arranged in another mounting groove 121 adjacent to the mounting groove 121 in the other set of mounting portions 12 form a magnetic pole.

[0033] Applying the technical solution of this embodiment, the rotor core 10 has multiple sets of mounting portions 12. Each set of mounting portions 12 includes at least two mounting grooves 121 spaced apart along the circumferential direction of the rotor core 10, and at least one first permanent magnet 30 is disposed in each mounting groove 121. The first magnetic isolation groove 13 is located between the mounting hole 11 and the multiple sets of mounting portions 12. In this way, two first permanent magnets 30 are arranged along the circumferential direction of the rotor core 10 within each magnetic pole, so as to significantly increase the q-axis inductance of the motor, thereby increasing the difference between the d-axis and q-axis inductances of the rotor, and enabling the effective utilization of reluctance torque. At the same time, through the above settings of the first magnetic isolation groove 13 and the multiple first permanent magnets 30, the high magnetic concentration ability of the motor is increased, thereby expanding the field weakening ability of the motor and increasing the anti-demagnetization ability of the motor, solving the problem of low motor efficiency in the prior art and improving the motor efficiency.

[0034] In this embodiment, the first magnetic isolation groove 13 enables an air magnetic barrier to be provided on the rotor, thereby reducing the magnetic flux density exerted by the magnetic field generated by the stator current on the first permanent magnet 30 and enhancing the anti-demagnetization ability of the motor.

[0035] Specifically, after the stator is powered on, magnetic lines of force are generated on the stator. When the magnetic lines of force pass through the rotor, the above setting of the first magnetic isolation groove 13 causes an air magnetic barrier to be generated on the rotor, resulting in a significant increase in magnetic resistance, thereby changing the direction and waveform of the magnetic lines of force, so that the air-gap magnetic density is sinusoidal and conforms to the sinusoidal magnetic pole design concept in the field of permanent magnet assisted synchronous reluctance motor design. Since the sinusoidal trend of the air-gap magnetic density is not only conducive to outputting a sinusoidal back electromotive force, enabling stable motor control, reducing torque ripple and harmonic losses, and thereby reducing the vibration and noise generated during the operation of the motor.

[0036] It should be noted that high magnetic concentration means that: under one pole, there are multiple magnetic steels, and the magnetic fields of the multiple magnetic steels are simultaneously concentrated into a magnetic field under one pole. Anti-demagnetization means that: the magnetic steel of a permanent magnet motor will be demagnetized under the action of the magnetic field of the stator winding.

[0037] Specifically, each set of mounting portions 12 includes two mounting grooves 121 spaced apart along the circumferential direction of the rotor core 10, so that the structure of each set of mounting portions 12 is simpler, easier to process and implement, reducing the processing cost and difficulty of the rotor core 10.

[0038] It should be noted that the number of mounting grooves 121 included in each set of mounting portions 12 is not limited to this, and can be adjusted according to working conditions and usage requirements. Optionally, each set of mounting portions 12 includes three, or four, or multiple mounting grooves 121.

[0039] In this embodiment, the first permanent magnet 30 is made of neodymium iron boron or ferrite, so that the material selection of the first permanent magnet 30 is more flexible to meet different usage requirements and working conditions. Since two first permanent magnets 30 are arranged along the circumferential direction of the rotor core 10 within each magnetic pole, the demagnetization of the motor is reduced, and the demagnetization resistance of the motor is increased.

[0040] In this embodiment, the two first permanent magnets 30 in each magnetic pole are arranged at intervals along the circumferential direction of the rotor core 10. Compared with the "one" shape and "V" shape in the prior art, the demagnetization of the motor is reduced. At the same time, by using the permanent magnet torque and reluctance torque, the cost of the motor can be reduced by 5%-10% compared with the cost of using only neodymium iron boron permanent magnets when outputting the same power.

[0041] Optionally, each mounting groove 121 includes a plurality of sub-mounting grooves 1211 arranged at intervals along the radial direction of the rotor core 10, and the plurality of sub-mounting grooves 1211 are arranged in one-to-one correspondence with the plurality of first permanent magnets 30. In this way, the above setting makes the first permanent magnet 30 form a matrix-type and tangential-type permanent magnet, fully utilizing the high magnetic concentration ability of the tangential rotor motor, expanding the weak magnetic ability of the motor, and also increasing the demagnetization resistance of the motor. At the same time, the above setting makes the first permanent magnet 30 arranged in layers along the radial direction of the rotor core 10, thereby increasing the magnetic flux of each magnetic pole.

[0042] In this embodiment, each mounting groove 121 includes three sub-mounting grooves 1211 arranged at intervals along the radial direction of the rotor core 10. First magnetic isolation grooves 13 are respectively arranged on both sides of the N and S poles of the first permanent magnet 30. By adjusting the distance between the first magnetic isolation grooves 13, the distribution of the air gap magnetic density can be made more sinusoidal, reducing the existence of harmonics. At the same time, the two poles of the tangential permanent magnet are parallel to the rotor magnetic field direction, and the first magnetic isolation groove 13 weakens the demagnetizing magnetic field, enhancing the demagnetization resistance of the motor.

[0043] It should be noted that the tangential permanent magnet means that when viewed along the rotor axis, each pole of the permanent magnet is arranged in an n-row and N-column matrix. Among them, 2 ≤ n ≤ 4, 3 ≤ N ≤ 5, and both n and N are integers.

[0044] It should be noted that the number of sub-mounting grooves 1211 in each mounting groove 121 is not limited to this, and can be adjusted according to the working conditions and usage requirements. Optionally, each mounting groove 121 includes two, or four, or five, or more sub-mounting grooves 1211 arranged at intervals along the radial direction of the rotor core 10.

[0045] Such as Figures 1 to 3As shown, the rotor further includes a plurality of second permanent magnets 40, and the rotor core 10 further has a plurality of auxiliary mounting portions 14 which are circumferentially spaced along the mounting hole 11. Among them, at least one auxiliary mounting portion 14 is provided between two adjacent sets of mounting portions 12, and at least one second permanent magnet 40 is provided in each auxiliary mounting portion 14. In this way, in two adjacent sets of mounting portions 12, the first permanent magnet 30 provided in one mounting groove 121 of one set of mounting portions 12, the first permanent magnet 30 provided in another mounting groove 121 adjacent to the mounting groove 121 in the other set of mounting portions 12, and the second permanent magnet 40 provided in one auxiliary mounting portion 14 form a magnetic pole, so that one magnetic pole includes more magnetic steels, generating a magnetic concentration effect, further increasing the magnetic flux of the rotor, and enhancing the demagnetization resistance of the motor.

[0046] Specifically, one auxiliary mounting portion 14 is provided between two adjacent sets of mounting portions 12, and one second permanent magnet 40 is provided in each auxiliary mounting portion 14, so that the structure of the rotor is simpler, easier to process and implement, and the processing cost of the rotor is reduced. At the same time, in one magnetic pole, the two first permanent magnets 30 on both sides of the second permanent magnet 40 are mirror-symmetrical with the second permanent magnet 40 as the center, and the magnetization directions of the tangential magnetic steels in each magnetic pole are the same.

[0047] It should be noted that the number of auxiliary mounting portions 14 provided between two adjacent sets of mounting portions 12 is not limited to this, and can be adjusted according to the working conditions and usage requirements. Optionally, two, or three, or four, or more auxiliary mounting portions 14 are provided between two adjacent sets of mounting portions 12.

[0048] It should be noted that the number of second permanent magnets 40 provided in each auxiliary mounting portion 14 is not limited to this, and can be adjusted according to the working conditions and usage requirements. Optionally, two, or three, or four, or more second permanent magnets 40 are provided in each auxiliary mounting portion 14.

[0049] In this embodiment, the second permanent magnet 40 is made of neodymium iron boron or ferrite, so that the material selection of the second permanent magnet 40 is more flexible to meet different usage requirements and working conditions.

[0050] Optionally, the rotor core 10 further has a second magnetic isolation groove 15, and at least part of the second magnetic isolation groove 15 is located between the auxiliary mounting portion 14 and the mounting portion 12 along the circumference of the rotor core 10. In this way, the second magnetic isolation groove 15 makes an air magnetic barrier provided on the rotor, thereby reducing the magnetic flux density of the magnetic field generated by the stator current acting on the second permanent magnet 40, and enhancing the demagnetization resistance of the motor.

[0051] Specifically, after the stator is energized, magnetic lines of force are generated on the stator. When the magnetic lines of force pass through the rotor, the above setting of the second magnetic isolation groove 15 causes an air magnetic barrier to be generated on the rotor, resulting in a significant increase in magnetic resistance, thereby changing the direction and waveform of the magnetic lines of force, so that the gap magnetic density becomes sinusoidal and conforms to the sinusoidal pole design concept in the field of permanent magnet assisted synchronous reluctance motor design. Since the sinusoidal direction of the gap magnetic density is not only conducive to outputting a sinusoidal back electromotive force, making the motor control stable, reducing torque ripple and harmonic losses, and further reducing the vibration and noise generated during the operation of the motor.

[0052] As Figure 2 and Figure 3 shown, the second magnetic isolation groove 15 includes a first groove section 151 and a second groove section 152. Among them, the first groove section 151 is located between the auxiliary installation part 14 and the installation part 12, and the first groove section 151 extends along the radial direction of the rotor core 10. The second groove section 152 is communicated with the first groove section 151 and has the same extension direction as the adjacent first magnetic isolation groove 13. In this way, the above setting ensures an air magnetic barrier between the first permanent magnet 30 and the second permanent magnet 40 on the one hand, thereby reducing the magnetic flux density of the magnetic field generated by the stator current acting on the first permanent magnet 30 and the second permanent magnet 40, and improving the demagnetization resistance ability of the motor. At the same time, the above setting makes the structure of the second magnetic isolation groove 15 simpler, easier to process and implement, and reduces the processing cost and processing difficulty of the second magnetic isolation groove 15.

[0053] Optionally, at least one second magnetic isolation groove 15 is provided on both sides of each second permanent magnet 40. The second groove section 152 of the second magnetic isolation groove 15 on one side penetrates the outer peripheral surface of the rotor core 10, and the second groove section 152 of the second magnetic isolation groove 15 on the other side is located inside the rotor core 10. In this way, the above setting makes the second magnetic isolation grooves 15 on both sides of the second permanent magnet 40 an asymmetric structure, thereby reducing the magnetic leakage on the rotor surface, improving the utilization rate of the magnetic steel, and further improving the heat dissipation ability of the rotor.

[0054] Optionally, the rotor core 10 further has a plurality of third magnetic isolation grooves 16, and the plurality of third magnetic isolation grooves 16 are arranged at intervals along the circumferential and / or radial directions of the rotor core 10. Among them, along the radial direction of the rotor core 10, at least part of the third magnetic isolation grooves 16 are arranged between two adjacent sub-installation grooves 1211. In this way, the third magnetic isolation grooves 16 cause an air magnetic barrier to be provided on the rotor, thereby reducing the magnetic flux density of the magnetic field generated by the stator current acting on the first permanent magnet 30, and improving the demagnetization resistance ability of the motor.

[0055] Specifically, after the given sub-stator is electrified, magnetic lines of force are generated on the stator. When the magnetic lines of force pass through the rotor, the above setting of the third magnetic isolation slot 16 causes an air magnetic barrier to be generated on the rotor, resulting in a significant increase in magnetic resistance, thereby changing the direction and waveform of the magnetic lines of force, so that the gap magnetic density becomes sinusoidal and conforms to the sinusoidal pole design concept in the field of permanent magnet assisted synchronous reluctance motor design. Since the sinusoidal direction of the gap magnetic density is not only conducive to outputting a sinusoidal back electromotive force, making the motor control stable, reducing torque ripple and harmonic losses, and further reducing the vibration and noise generated during the operation of the motor.

[0056] As Figure 2 and Figure 3 shown, the third magnetic isolation slot 16 includes a third slot section 161 and a fourth slot section 162. Among them, the third slot section 161 is arranged between two adjacent sub-installation slots 1211. The fourth slot section 162 is communicated with the third slot section 161 and is arranged at an angle with the third slot section 161. The fourth slot section 162 is located between the auxiliary installation part 14 and the installation part 12 adjacent to the auxiliary installation part 14. In this way, the above setting ensures an air magnetic barrier between the first permanent magnet 30 and the second permanent magnet 40 on the one hand, thereby reducing the magnetic flux density of the magnetic field generated by the stator current acting on the first permanent magnet 30 and the second permanent magnet 40, and improving the anti-demagnetization ability of the motor. At the same time, the above setting makes the structure of the third magnetic isolation slot 16 simpler, easier to process and implement, and reduces the processing cost and processing difficulty of the third magnetic isolation slot 16.

[0057] In this embodiment, the fourth slot section 162 of one of the two adjacent third magnetic isolation slots 16 penetrates the outer peripheral surface of the rotor core 10, and the fourth slot section 162 of the other third magnetic isolation slot 16 is located inside the rotor core 10. In this way, for the third magnetic isolation slot 16 (the third magnetic isolation slot 16 has no connection bridge) that penetrates the outer peripheral surface of the rotor core 10, no magnetic lines of force pass through here. Compared with the third magnetic isolation slot 16 (the third magnetic isolation slot 16 has a connection bridge) located inside the rotor core 10, the surface magnetic leakage of the motor can be reduced by 20% - 30%. At the same time, the third magnetic isolation slot 16 (the third magnetic isolation slot 16 has no connection bridge) that penetrates the outer peripheral surface of the rotor core 10 directly communicates with the air gap and the first permanent magnet 30, which is beneficial to the heat dissipation of the rotor core and the first permanent magnet 30.

[0058] In this embodiment, a third magnetic isolation groove 16 adjacent to a second magnetic isolation groove 15 penetrating the outer peripheral surface of the rotor core 10 is located inside the rotor core 10, and a third magnetic isolation groove 16 adjacent to the second magnetic isolation groove 15 located inside the rotor core 10 penetrates the outer peripheral surface of the rotor core 10. In this way, for the third magnetic isolation groove 16 (without a connection bridge) penetrating the outer peripheral surface of the rotor core 10, no magnetic flux lines pass through here. Compared with the third magnetic isolation groove 16 (with a connection bridge) located inside the rotor core 10, the surface magnetic leakage of the motor can be reduced by 20% - 30%. At the same time, the third magnetic isolation groove 16 (without a connection bridge) penetrating the outer peripheral surface of the rotor core 10 is directly connected to the air gap and the first permanent magnet 30, which is beneficial to the heat dissipation of the rotor core and the first permanent magnet 30.

[0059] In this embodiment, among two adjacent magnetic poles, along the circumferential direction of the rotor core 10, one of the two adjacent third magnetic isolation grooves 16 penetrates the outer peripheral surface of the rotor core 10, and the other third magnetic isolation groove 16 is located inside the rotor core 10. In this way, the above setting makes the third magnetic isolation grooves 16 in two adjacent magnetic poles have an asymmetric structure, thereby reducing the surface magnetic leakage of the rotor, improving the utilization rate of the magnetic steel, and further improving the heat dissipation capacity of the rotor.

[0060] In this embodiment, along the direction from the central axis to the outer peripheral surface of the rotor core 10, the height H of each sub - mounting groove 1211 in each mounting groove 121 m satisfies the following relationship: where N is the number of sub - mounting grooves 1211 in each mounting groove 121, 3 ≤ N ≤ 5; m is the setting order of the sub - mounting grooves 1211, m ≤ N. In this way, along the radial direction of the rotor core 10, the heights of the first permanent magnets 30 are different, thereby reducing the eddy current loss of the magnetic steel and improving the efficiency of the motor. At the same time, the above setting makes the first magnetic isolation groove 13, the second magnetic isolation groove 15, the third magnetic isolation groove 16 and the axial direction of the rotor core 10 be distributed in a zigzag shape, thereby reducing the magnetic leakage of the surface connection bridge of the rotor, improving the utilization rate of the magnetic steel, and increasing the heat dissipation performance of the motor.

[0061] Specifically, along the direction from the central axis to the outer peripheral surface of the rotor core 10, three sub - mounting grooves 1211 are provided in each mounting groove 121, N is 3, then the height H of the first sub - mounting groove 1211 1 is the height of the first permanent magnet 30 arranged in the first sub - mounting groove 1211 is the same as the height H of the first sub - mounting groove 1211; the height H of the second sub - mounting groove 1211 1 is 2 is the height of the first permanent magnet 30 arranged in the second sub - mounting groove 1211 is the same as the height H of the second sub - mounting groove 1211 2the same; the height H of the third sub-installation groove 1211 3 is the height of the first permanent magnet 30 disposed in the third sub-installation groove 1211 is the same as the height H of the third sub-installation groove 1211 3 wherein, the height ratio of the three sub-installation grooves 1211 is

[0062] such as Figure 2 and Figure 3 As shown, the rotor core 10 includes a plurality of sub-rotor cores stacked along its central axis. Each sub-rotor core has an A surface and a B surface. The A and B surfaces of adjacent two sub-rotor cores are arranged in a staggered manner. The first magnetic isolation grooves 13, the second magnetic isolation grooves 15, and the third magnetic isolation grooves 16 of each sub-rotor core are asymmetrically distributed, and the distances between the magnetic isolation grooves change according to a sine law, so that the connecting bridges of the first magnetic isolation grooves 13, the second magnetic isolation grooves 15, and the third magnetic isolation grooves 16 change in a sawtooth shape, reducing the magnetic leakage of the motor.

[0063] Specifically, when viewed from the A surface, there is a connecting bridge between the third magnetic isolation groove 16 in the middle and the outer surface of the rotor core 10 (the third magnetic isolation groove 16 is located inside the rotor core 10). The connecting bridge connects the two sides of the magnetic isolation bridge of the rotor core 10, strengthening the structural strength of the entire rotor. There is no connecting bridge between the third magnetic isolation groove 16 on the outer side and the second magnetic isolation groove 15 on the inner side and the outer surface of the rotor core 10 (the third magnetic isolation groove 16 on the outer side and the second magnetic isolation groove 15 on the inner side penetrate the outer surface of the rotor core 10). Therefore, when viewed from the A surface, the connecting bridges appear alternately, thereby reducing the surface magnetic leakage of the rotor core 10. The principle is that the material used for the rotor core 10 is silicon steel sheet with good magnetic conductivity, while the magnetic isolation grooves are made of non-magnetic materials such as air or epoxy resin, with poor magnetic conductivity.

[0064] Specifically, when viewed from the B surface, there is a connecting bridge between the third magnetic isolation groove 16 on the outer side and the second magnetic isolation groove 15 on the inner side and the outer surface of the rotor core 10, and there is no magnetic isolation bridge between the third magnetic isolation groove 16 in the middle and the outer surface of the rotor core 10. When a plurality of sub-rotor cores are stacked, the A and B surfaces are stacked alternately. At this time, the third magnetic isolation groove 16 on the A surface of the rotor coincides with the third magnetic isolation groove 16 on the B surface on the outer side, the third magnetic isolation groove 16 in the middle coincides with the third magnetic isolation groove 16 in the middle, and the second magnetic isolation groove 15 on the inner side coincides with the second magnetic isolation groove 15 on the inner side. When viewed axially from the outer surface of the rotor, the magnetic isolation grooves and the connecting bridges appear alternately like sawteeth. Among them, due to the presence of the magnetic isolation grooves, the direction of the magnetic induction intensity vector of the demagnetizing magnetic field changes and decreases, improving the anti-demagnetization ability of the motor, and the demagnetizing current multiple can be increased by 15% - 30%.

[0065] In this embodiment, Figure 5Shows a schematic diagram of the matrix magnet single-row structure. Each row of magnets consists of three first permanent magnets 30, and the heights of the three first permanent magnets 30 are H 1 , H 2 and H 3 . The heights of the three first permanent magnets 30 vary sinusoidally. Due to the effect of the first magnetic isolation groove 13, a sinusoidal magnetic field will also be generated in the air gap by the first permanent magnets 30, reducing the existence of harmonics. Specifically, the height distribution ratio of the first permanent magnets 30 from the rotating shaft 20 to the outer surface of the rotor core 10 is shown in Table 1:

[0066] Table 1 Height distribution ratio of the first permanent magnet from the rotating shaft to the outer surface of the rotor core

[0067] Radial quantity n of the first permanent magnet 30 Height distribution ratio of n first permanent magnets 30 3 0.92:0.707:0.38 4 0.95:0.81:0.58:0.3 5 0.96:0.86:0.71:0.5:0.26

[0068] In this embodiment, no filling material (i.e., air) is provided in the first magnetic isolation groove 13, which is beneficial to the heat dissipation inside the rotor core 10 and the first permanent magnets 30.

[0069] Optionally, non-magnetic and non-conductive materials such as epoxy resin and polyester fiber are provided in the first magnetic isolation groove 13, thereby increasing the structural strength of the rotor.

[0070] In this embodiment, Figure 6 shows a curve diagram of the influence of the number of rows n and the radial quantity of the matrix magnets on the motor efficiency. From Figure 6 it can be concluded that compared with the entire magnet of the same volume, the segmented structure can reduce the eddy current loss of the magnet by 10% - 25%, and at the same time increase the strength of the magnet by 5% - 15%.

[0071] This application also provides a motor (not shown), including a stator and a rotor disposed inside the stator. Among them, the rotor is the above-mentioned rotor.

[0072] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0073] The rotor core has multiple groups of mounting parts. Each group of mounting parts includes at least two mounting grooves spaced circumferentially along the rotor core, and at least one first permanent magnet is provided in each mounting groove. The first magnetic isolation groove is located between the mounting holes and the multiple groups of mounting parts. In this way, two first permanent magnets are provided along the circumferential direction of the rotor core inside each magnetic pole, so that the q-axis inductance of the motor is significantly increased, thereby increasing the difference between the d-axis and q-axis inductances of the rotor, enabling the effective utilization of reluctance torque. At the same time, through the above settings of the first magnetic isolation groove and the multiple first permanent magnets, the high magnetic concentration ability of the motor is increased, thereby expanding the field weakening ability of the motor and increasing the anti-demagnetization ability of the motor, solving the problem of low motor efficiency in the prior art and improving the motor efficiency.

[0074] Obviously, the embodiments described above are only some of the embodiments of the present invention, not all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts shall fall within the protection scope of the present invention.

[0075] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0076] It should be noted that the terms "first", "second", etc. in the description, claims and drawings of the present application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0077] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A rotor, characterized in that, comprising: a rotor core (10), the rotor core (10) having a mounting hole (11), a plurality of sets of mounting portions (12) and a first magnetic isolation groove (13), the mounting hole (11) being for mounting a rotating shaft (20), the plurality of sets of mounting portions (12) being circumferentially spaced along the mounting hole (11); in the radial direction of the rotor core (10), the first magnetic isolation groove (13) is located between the mounting hole (11) and the plurality of sets of mounting portions (12); a plurality of first permanent magnets (30); wherein, each set of mounting portions (12) includes at least two mounting grooves (121) circumferentially spaced along the rotor core (10), each mounting groove (121) extending in the radial direction of the rotor core (10), and at least one of the first permanent magnets (30) is disposed in each mounting groove (121); in two adjacent sets of the mounting portions (12), the first permanent magnet (30) disposed in one mounting groove (121) of one set of the mounting portions (12) and the first permanent magnet (30) disposed in another mounting groove (121) adjacent to this mounting groove (121) in the other set of the mounting portions (12) form a magnetic pole; each mounting groove (121) includes a plurality of sub-mounting grooves (1211) radially spaced along the rotor core (10), and the plurality of sub-mounting grooves (1211) are provided in one-to-one correspondence with the plurality of first permanent magnets (30); In the direction from the central axis of the rotor core (10) to the outer peripheral surface, the height H of each sub-mounting groove (1211) in each mounting groove (121) m satisfies the following relationship: where N is the number of the sub-mounting grooves (1211) in each mounting groove (121), 3 ≤ N ≤ 5; m is the setting order of the sub-mounting grooves (1211), and m ≤ N.

2. The rotor according to claim 1, characterized in that, the rotor further includes a plurality of second permanent magnets (40), the rotor core (10) further having a plurality of auxiliary mounting portions (14), the plurality of auxiliary mounting portions (14) being circumferentially spaced along the mounting hole (11); wherein, at least one of the auxiliary mounting portions (14) is provided between two adjacent sets of the mounting portions (12), and at least one of the second permanent magnets (40) is disposed in each auxiliary mounting portion (14).

3. The rotor according to claim 2, characterized in that, the rotor core (10) further has a second magnetic isolation groove (15), and at least part of the second magnetic isolation groove (15) is located between the auxiliary mounting portion (14) and the mounting portion (12) in the circumferential direction of the rotor core (10).

4. The rotor according to claim 3, characterized in that, the second magnetic isolation groove (15) includes: a first groove segment (151), located between the auxiliary mounting portion (14) and the mounting portion (12), the first groove segment (151) extending in the radial direction of the rotor core (10); a second groove segment (152), communicating with the first groove segment (151) and having the same extending direction as the adjacent first magnetic isolation groove (13).

5. The rotor according to claim 4, characterized in that, At least one of the second magnetic isolation grooves (15) is provided on both sides of each of the second permanent magnets (40). The second groove section (152) of the second magnetic isolation groove (15) on one side penetrates through the outer peripheral surface of the rotor core (10), and the second groove section (152) of the second magnetic isolation groove (15) on the other side is located within the rotor core (10).

6. The rotor according to claim 5, wherein, the rotor core (10) further has a plurality of third magnetic isolation grooves (16), and the plurality of third magnetic isolation grooves (16) are arranged at intervals along the circumferential direction and / or the radial direction of the rotor core (10); wherein, along the radial direction of the rotor core (10), at least a part of the third magnetic isolation grooves (16) are arranged between two adjacent sub-installation grooves (1211).

7. The rotor according to claim 6, wherein, the third magnetic isolation groove (16) includes: a third groove section (161) arranged between two adjacent sub-installation grooves (1211); a fourth groove section (162) communicating with the third groove section (161) and arranged at an angle with the third groove section (161), and the fourth groove section (162) is located between the auxiliary installation part (14) and the installation part (12) adjacent to the auxiliary installation part (14).

8. The rotor according to claim 7, wherein, the fourth groove section (162) of one of the two adjacent third magnetic isolation grooves (16) penetrates through the outer peripheral surface of the rotor core (10), and the fourth groove section (162) of the other third magnetic isolation groove (16) is located within the rotor core (10).

9. The rotor according to claim 6, wherein, the third magnetic isolation groove (16) adjacent to the second magnetic isolation groove (15) penetrating through the outer peripheral surface of the rotor core (10) is located within the rotor core (10); and / or, the third magnetic isolation groove (16) adjacent to the second magnetic isolation groove (15) located within the rotor core (10) penetrates through the outer peripheral surface of the rotor core (10).

10. The rotor according to claim 7, wherein, among two adjacent magnetic poles, along the circumferential direction of the rotor core (10), the fourth groove section (162) of one of the two adjacent third magnetic isolation grooves (16) penetrates through the outer peripheral surface of the rotor core (10), and the fourth groove section (162) of the other third magnetic isolation groove (16) is located within the rotor core (10).

11. A motor, wherein, it includes a stator and a rotor arranged within the stator; wherein, the rotor is the rotor according to any one of claims 1 to 10.

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