Rotor structure and electric machine

Abstract

The application provides a rotor structure and a motor. The rotor structure comprises a rotor core (3), the rotor core (3) has air slots (4), permanent magnets (1) and conductor areas located at the outer circumferential side, in a cross section perpendicular to the central axis of the rotor core (3), the number of the air slots (4) is at least two under one pole, the at least two air slots (4) extend along the d-axis direction and form a magnetic barrier layer, the ends of the air slots (4) extend into the conductor areas, a plurality of conductor slots (5) are arranged at intervals in the circumferential direction in the conductor areas, at least part of the conductor slots (5) are located between the ends of the adjacent air slots (4), and the permanent magnets (1) are located at the middle positions of the air slots (4). According to the rotor structure, the motor conductor loss and the conductor consumption can be reduced, and the motor efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to a rotor structure and an electric machine. BACKGROUND

[0002] Permanent magnet assisted synchronous reluctance machine has the advantages of high efficiency, high power factor, large torque density, wide response frequency, and no need for complex couplers, and is widely used in industrial and scientific fields, but has the problem of self-starting, mainly because of rotor copper loss, which reduces the starting torque of the motor, and large rotor copper loss affects the efficiency of the motor.

[0003] The self-starting permanent magnet assisted synchronous reluctance machine combines the advantages of asynchronous machines on the basis of permanent magnet assisted synchronous reluctance machines, and realizes self-starting through the asynchronous torque generated by the rotor bars of the squirrel cage structure, and realizes constant speed operation through permanent magnet torque and reluctance torque. Compared with asynchronous machines, the motor can run at constant speed and has low rotor loss and high efficiency; compared with asynchronous starting permanent magnet synchronous machines, the amount of permanent magnet is small, and the cost of the motor is low. Compared with permanent magnet assisted synchronous reluctance machines, the motor does not need a frequency converter to start, and the cost is low.

[0004] The existence of the squirrel cage structure increases the conductor loss and the amount of conductors, and reduces the efficiency of the motor. SUMMARY

[0005] The main purpose of the present application is to provide a rotor structure and an electric machine, which can reduce the conductor loss and the amount of conductors of the motor and improve the efficiency of the motor.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a rotor structure is provided, comprising a rotor core, the rotor core having air slots, permanent magnets and a conductor area located on the outer periphery, in a cross section perpendicular to the central axis of the rotor core, the number of air slots is at least two under one pole, at least two air slots extend along the d-axis direction and form a magnetic barrier layer, the ends of the air slots extend into the conductor area, a plurality of conductor slots are arranged at intervals in the circumferential direction in the conductor area, at least part of the conductor slots are located between the ends of adjacent air slots, and the permanent magnets are located at the middle positions of the air slots.

[0007] Further, one conductor slot is arranged between the ends of the same end of the two adjacent air slots, and the conductor slot is located at the middle position of the two adjacent air slots.

[0008] Further, on the q-axis, in the direction from the outer circle of the rotor to the shaft hole, the air slots include a first air slot and a second air slot arranged in sequence, the conductor slots include a first conductor slot located between the first air slot and the second air slot, the distance between the end of the first air slot and the end of the second air slot is k1, the width of the first conductor slot is l1, and 0.4*k1≤l1≤0.5*k1.

[0009] Further, the air slot further comprises a third air slot arranged at the second air slot close to the shaft hole, and the conductor slot further comprises a second conductor slot between the second air slot and the third air slot, the distance between the end of the second air slot and the end of the third air slot is k2, the width of the second conductor slot is l2, and 0.42*k2≤l2≤0.55*k2.

[0010] Further, on the q-axis, along the direction from the outer circle of the rotor to the shaft hole, the air slot comprises a first air slot, a second air slot and a third air slot arranged in sequence, the third air slots of adjacent poles are adjacent, and the conductor slot comprises a third conductor slot between the adjacent third air slots, the distance between the adjacent third air slots is k3, the width of the third conductor slot is l3, and 0.4*k3≤l3≤0.5*k3.

[0011] Further, on the q-axis, along the direction from the outer circle of the rotor to the shaft hole, the air slot comprises a first air slot, a second air slot and a third air slot arranged in sequence, the third air slots of adjacent poles are adjacent, and the conductor slot comprises a first conductor slot, a second conductor slot and a third conductor slot, the first conductor slot is between the first air slot and the second air slot, the second conductor slot is between the second air slot and the third air slot, and the third conductor slot is between the adjacent third air slots.

[0012] Further, the middle width of the i-th air slot is ci, and the end width is bi, and 0.55bi≤ci≤0.65bi, where i=1, 2, 3.

[0013] Further, the middle part and the two end parts of the first air slot form an inflection point, in the cross section perpendicular to the central axis of the rotor core, the included angle between the line connecting the end point of the first air slot and the central axis of the rotor core and the q-axis is α1, the included angle between the line connecting the inflection point of the first air slot and the central axis of the rotor core and the q-axis is θ1, and 0.68α1≤θ1≤0.72α1; and / or, the middle part and the two end parts of the second air slot form an inflection point, in the cross section perpendicular to the central axis of the rotor core, the included angle between the line connecting the end point of the second air slot and the central axis of the rotor core and the q-axis is α2, the included angle between the line connecting the inflection point of the second air slot and the central axis of the rotor core and the q-axis is θ2, and 0.72α2≤θ2≤0.82α2; and / or, the middle part and the two end parts of the third air slot form an inflection point, in the cross section perpendicular to the central axis of the rotor core, the included angle between the line connecting the end point of the third air slot and the central axis of the rotor core and the q-axis is α3, the included angle between the line connecting the inflection point of the third air slot and the central axis of the rotor core and the q-axis is θ3, and 0.89α3≤θ3≤0.94α3.

[0014] Further, a diameter of a circle on which a side of the conductor slot close to the rotation axis is located is Φ1, a diameter of the outer circle of the rotor is D1, and 0.82*D1≤Φ1≤0.85*D1; and / or, a diameter of a circle on which a side of the conductor slot close to the outer circle of the rotor is located is Φ2, a diameter of the outer circle of the rotor is D1, and 0.87*D1≤Φ2≤0.99*D1.

[0015] Further, a diameter of a circle on which an end of the air slot is located is Φ3, a diameter of the outer circle of the rotor is D1, a width of the tangential rib formed between the end of the air slot and the outer circle of the rotor is (D1-Φ3) / 2, and 0.6mm≤(D1-Φ3) / 2≤1.3mm.

[0016] Further, a total area of the conductor slot is S1, and a cross-sectional area of the rotor core is S, and 0.075*S≤S1≤0.076*S.

[0017] Further, an air slot located at a radially outermost side in the q-axis direction is a first air slot, in a cross section perpendicular to a central axis of the rotor core, conductor slots are arranged between the q-axis and ends of the first air slot, an included angle between a line connecting an end point of the end of the first air slot and the central axis of the rotor core and the q-axis is α1, two conductor slots located on both sides of the q-axis and between the two ends of the first air slot have mutually distanced outer sides, an included angle between the two outer sides is β1, and 1.16*α1≤β1≤1.3*α1.

[0018] Further, under one pole, three conductor slots are arranged between the two ends of the first air slot, the three conductor slots have the same width in the circumferential direction and the width is l4, a diameter of a circle on which a side of the conductor slot close to the rotation axis is located is Φ1, and β1 / (2pi)*(Φ1*pi) / 6.2≤l4≤β1 / (2pi)*(Φ1*pi) / 5.8.

[0019] Further, the conductor slot is an aluminum casting slot.

[0020] Further, an end of the rotor core is provided with a cover plate, the cover plate covers the conductor area, a communication hole is formed in the cover plate, and the communication hole and the conductor slot one-to-one correspond.

[0021] According to another aspect of the present application, there is provided an electric machine comprising a rotor structure as described above.

[0022] The rotor structure comprises a rotor core, the rotor core has air slots, permanent magnets and conductor regions located at the outer circumferential side, in a cross section perpendicular to the central axis of the rotor core, the number of air slots is at least two under one pole, at least two air slots extend along the d-axis direction and form a magnetic barrier layer, the ends of the air slots extend into the conductor regions, a plurality of conductor slots are arranged in the conductor regions in the circumferential direction, at least part of the conductor slots are located between the ends of adjacent air slots, and the permanent magnets are located at the middle positions of the air slots. The rotor structure makes the ends of the air slots forming the magnetic barrier layer extend into the conductor regions for arranging the conductor slots, so that the air slots occupy part of the positions for arranging the conductor slots, the arrangement positions of the conductor slots can be changed, the area of the conductor slots is reduced, the amount of conductors in the conductor slots is reduced, the magnetic density distribution is changed, the conductor loss is reduced, the arrangement positions of the conductors are changed, the leakage magnetic of the rotor structure is reduced, the harmonic magnetic field is reduced, the current and the iron loss are reduced, and the motor efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] The drawings accompanying the specification of this application form a part thereof, serve to further provide a further understanding of the application, and together with the description of the exemplary embodiments of the application, serve to explain the application, and do not constitute an improper limitation of the application. In the drawings:

[0024] Figure 1 A structural schematic diagram of a rotor structure of an embodiment of the application is shown;

[0025] Figure 2 A partial enlarged structural diagram of a rotor structure of an embodiment of the application is shown;

[0026] Figure 3 A cover plate structural schematic diagram of a rotor structure of an embodiment of the application is shown;

[0027] Figure 4 A torque comparison diagram of a motor of an embodiment of the application and a motor of a related art is shown;

[0028] Figure 5 A current harmonic comparison diagram of a motor of an embodiment of the application and a motor of a related art is shown; and

[0029] Figure 6 A rotational speed comparison diagram of a motor of an embodiment of the application and a motor of a related art is shown.

[0030] In the above drawings, the following reference signs are used:

[0031] 1, permanent magnet; 2, rotor lamination; 3, rotor core; 4, air slot; 41, first air slot; 42, second air slot; 43, third air slot; 5, conductor slot; 51, first conductor slot; 52, second conductor slot; 53, third conductor slot; 6, positioning hole; 7, cover plate; 8, communication hole. DETAILED DESCRIPTION

[0032] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0033] In combination with Figures 1 to 6 As shown in the drawings, according to the embodiment of the present application, the rotor structure includes a rotor core 3, the rotor core 3 has air slots 4, permanent magnets 1 and a conductor area located on the outer peripheral side, in a cross section perpendicular to the central axis of the rotor core 3, the number of air slots 4 is at least two under one pole, at least two air slots 4 extend along the d-axis direction and form a magnetic barrier layer, the ends of the air slots 4 extend into the conductor area, a plurality of conductor slots 5 are arranged in the conductor area in a circumferential direction, at least part of the conductor slots 5 are located between the ends of adjacent air slots 4, and the permanent magnets 1 are located at the middle positions of the air slots 4.

[0034] The rotor structure makes the ends of the air slots 4 forming the magnetic barrier layer extend into the conductor area for arranging the conductor slots 5, so that the air slots 4 occupy part of the positions for arranging the conductor slots 5, the arrangement positions of the conductor slots 5 can be changed, the area of the conductor slots 5 is reduced, which helps to reduce the amount of conductors in the conductor slots 5, changes the magnetic density distribution, and further reduces the conductor loss, changes the position of the conductor slots 5, changes the arrangement position of the conductors, reduces the leakage magnetic of the rotor structure, reduces the harmonic magnetic field, and further reduces the current and iron loss, and improves the efficiency of the motor.

[0035] The permanent magnets 1 arranged in the air slots 4 can play the role of auxiliary magnetic field by the permanent magnets 1, and enhance the performance of the reluctance motor. The magnetic field generated by the permanent magnets 1 can improve the magnetic field density of the motor, thereby increasing the output power and efficiency of the motor. In addition, the permanent magnets 1 can also reduce the resistance of the motor, reduce the loss of the motor, and improve the response speed and dynamic performance of the motor.

[0036] In one embodiment, the rotor structure includes rotor laminations 2, a plurality of rotor laminations 2 are stacked along the axial direction to form a rotor core 3, and the rotor core 3 is provided with a plurality of air slots 4, conductor slots 5 and positioning holes 6, wherein the positioning holes 6 are arranged on the side of the air slots 4 close to the shaft, and are used to realize the connection and fixation of the rotor laminations 2.

[0037] The conductor slot 5 is arranged at the outer periphery of the rotor core 3 in a circumferential direction, and is filled with a conductive and non-magnetic material, which forms a conductor, so that the motor has a self-starting capability.

[0038] In one embodiment, two adjacent air slots 4 are provided with a conductor slot 5 between the ends of the same end, and the conductor slot 5 is located at the middle position of the two adjacent air slots 4.

[0039] In this embodiment, the two adjacent air slots 4 are provided with a conductor slot 5 between the ends of the same end, and the conductor slot 5 is located at the middle position of the two adjacent air slots 4. On the one hand, this can further reduce the number of conductor slots 5, facilitate the arrangement of more layers of magnetic barrier layers, further improve the magnetic resistance difference between the d-axis and the q-axis, and improve the output power and efficiency of the motor. On the other hand, the spacing between the conductor slot 5 and the two adjacent air slots 4 can be the same, thereby improving the self-starting performance of the motor.

[0040] In one embodiment, on the q-axis, along the direction from the outer circle of the rotor to the shaft hole, the air slot 4 includes a first air slot 41 and a second air slot 42 arranged in sequence, and the conductor slot 5 includes a first conductor slot 51 located between the first air slot 41 and the second air slot 42. The distance between the end of the first air slot 41 and the end of the second air slot 42 is k1, the width of the first conductor slot 51 is l1, and 0.4*k1≤l1≤0.5*k1.

[0041] In one embodiment, the air slot 4 further includes a third air slot 43 arranged on the side of the second air slot 42 close to the shaft hole, and the conductor slot 5 further includes a second conductor slot 52 located between the second air slot 42 and the third air slot 43. The distance between the end of the second air slot 42 and the end of the third air slot 43 is k2, the width of the second conductor slot 52 is l2, and 0.42*k2≤l2≤0.55*k2.

[0042] In one embodiment, on the q-axis, along the direction from the outer circle of the rotor to the shaft hole, the air slot 4 includes a first air slot 41, a second air slot 42, and a third air slot 43 arranged in sequence, and the third air slots 43 of adjacent poles are adjacent. The conductor slot 5 includes a third conductor slot 53 located between the adjacent third air slots 43. The distance between the adjacent third air slots 43 is k3, the width of the third conductor slot 53 is l3, and 0.4*k3≤l3≤0.5*k3.

[0043] For reference Figure 5 As shown, by limiting the relationship between the spacing between the ends of the adjacent air slots 4 and the width of the conductor slot 5 between the adjacent air slots 4, the current harmonics can be reduced, thereby reducing the harmonic magnetic field, changing the magnetic flux density distribution, reducing the conductor loss, and improving the efficiency of the motor.

[0044] In one embodiment, in the q-axis direction from the outer circle of the rotor to the shaft hole, the air slot 4 includes a first air slot 41, a second air slot 42, and a third air slot 43 arranged in sequence, the third air slots 43 of adjacent poles are adjacent, the conductor slot 5 includes a first conductor slot 51, a second conductor slot 52, and a third conductor slot 53, the first conductor slot 51 is located between the first air slot 41 and the second air slot 42, the second conductor slot 52 is located between the second air slot 42 and the third air slot 43, and the third conductor slot 53 is located between the adjacent third air slots 43.

[0045] For reference Figure 4 As shown in the figure, in the present embodiment, under one pole, there are three air slots 4, namely a first air slot 41, a second air slot 42, and a third air slot 43, the first conductor slot 51 is arranged between the first air slot 41 and the second air slot 42, the second conductor slot 52 is arranged between the second air slot 42 and the third air slot 43, and the third conductor slot 53 is arranged between the adjacent third air slots 43 of adjacent poles, which can improve the self-starting ability of the motor and reduce the torque stabilization time.

[0046] In one embodiment, the middle width of the i-th air slot 4 is ci, and the end width is bi, 0.55bi≤ci≤0.65bi, where i=1, 2, 3.

[0047] In the present embodiment, there are three air slots 4, namely a first air slot 41, a second air slot 42, and a third air slot 43, wherein the middle width of the first air slot 41 is c1, and the end width is b1, the middle width of the second air slot 42 is c2, and the end width is b2, and the middle width of the third air slot 43 is c3, and the end width is b3.

[0048] By limiting the relationship between the middle width and the end width of the air slot 4, the end width can be limited by the correlation between the two, thereby increasing the mechanical strength of the rotor structure and improving the stability and reliability of the motor operation.

[0049] In one embodiment, the first air slot 41 forms a corner between the middle part and the two end parts, in the cross section perpendicular to the central axis of the rotor core 3, the angle between the connecting line between the end point of the first air slot 41 and the central axis of the rotor core 3 and the q-axis is α1, the angle between the connecting line between the inflection point of the first air slot 41 and the central axis of the rotor core 3 and the q-axis is θ1, and 0.68α1≤θ1≤0.72α1.

[0050] In one embodiment, the second air slot 42 forms a corner between the middle portion and the two end portions, and in a cross section perpendicular to the central axis of the rotor core 3, the angle between the line connecting the end point of the second air slot 42 and the central axis of the rotor core 3 and the q-axis is a2, and the angle between the line connecting the corner point of the second air slot 42 and the central axis of the rotor core 3 and the q-axis is θ2, 0.72a2≤θ2≤0.82a2.

[0051] In one embodiment, the third air slot 43 forms a corner between the middle portion and the two end portions, and in a cross section perpendicular to the central axis of the rotor core 3, the angle between the line connecting the end point of the third air slot 43 and the central axis of the rotor core 3 and the q-axis is a3, and the angle between the line connecting the corner point of the third air slot 43 and the central axis of the rotor core 3 and the q-axis is θ3, 0.89a3≤θ3≤0.94a3.

[0052] Through the above definition, the occupying area of the air slot 4 in the circumferential direction can be defined, and the corner position of the air slot can be defined, so as to reduce the adverse effect of the air slot 4 on the mechanical strength of the rotor structure, enhance the mechanical strength of the rotor structure, and optimize the structure of the air slot 4, and increase the output capacity of the motor.

[0053] In one embodiment, the diameter of the circle on which the side of the conductor slot 5 close to the rotation shaft is located is Φ1, the diameter of the outer circle of the rotor is D1, and 0.82*D1≤Φ1≤0.85*D1.

[0054] In one embodiment, the diameter of the circle on which the side of the conductor slot 5 close to the outer circle of the rotor is located is Φ2, the diameter of the outer circle of the rotor is D1, and 0.87*D1≤Φ2≤0.99*D1.

[0055] Through the above definition, the magnetic flux density distribution between the air slots 4 can be changed, the iron loss can be reduced, and the output capacity of the motor can be improved.

[0056] In one embodiment, the diameter of the circle on which the end portion of the air slot 4 is located is Φ3, the diameter of the outer circle of the rotor is D1, the width of the tangential rib formed between the end of the air slot 4 and the outer circle of the rotor is (D1-Φ3) / 2, and 0.6mm≤(D1-Φ3) / 2≤1.3mm. The tangential rib here refers to the rib located between the end portion of the air slot 4 and the outer circle of the rotor and extending in the circumferential direction.

[0057] In the present embodiment, by limiting the thickness of the tangential rib, the thickness of the tangential rib can be prevented from being too small to ensure the structural strength of the rotor structure, and the thickness of the tangential rib can be prevented from being too large to effectively reduce the magnetic leakage of the motor and reduce the torque ripple.

[0058] In one embodiment, the total area of the conductor slot 5 is S1, the cross-sectional area of the rotor core 3 is S, and 0.075*S≤S1≤0.076*S.

[0059] In the present embodiment, by limiting the relationship between the total area of the conductor slot 5 and the cross-sectional area of the rotor core 3, the area ratio of the total area of the conductor slot 5 on the rotor core 3 can be limited, and the conductor usage can be reduced while ensuring the starting ability of the motor.

[0060] In one embodiment, the air slot 4 located at the radially outermost side in the q-axis direction is a first air slot 41, in a cross-section perpendicular to the central axis of the rotor core 3, conductor slots 5 are arranged between the q-axis and the end of the first air slot 41, the included angle between the connecting line between the end point of the end of the first air slot 41 and the central axis of the rotor core 3 and the q-axis is α1, and the two conductor slots 5 located on both sides of the q-axis and between the two ends of the first air slot 41 have mutually distant outer sides, and the included angle between the two outer sides is β1, and 1.16*α1≤β1≤1.3*α1.

[0061] In the present embodiment, the two conductor slots 5 are located between the two ends of the first air slot 41 and are located on both sides of the q-axis and are farthest from the q-axis.

[0062] By limiting the relationship between the included angle between the two outer sides of the two conductor slots 5 and the included angle between the end point of the end of the first air slot 41 and the connecting line of the rotor core center, the setting position of the conductor slot 5 between the two ends of the first air slot 41 can be limited, so that the position of the two conductor slots 5 located on both sides of the q-axis is more reasonable, and the starting ability of the motor can be effectively improved.

[0063] In one embodiment, under one pole, three conductor slots 5 are arranged between the two ends of the first air slot 41, the widths of the three conductor slots 5 in the circumferential direction are the same and are l4, the diameter of the circle on which the side of the conductor slot 5 close to the rotating shaft is located is Φ1, and β1 / 2pi*Φ1*pi / 6.2≤l4≤β1 / 2pi*Φ1*pi / 5.8.

[0064] For reference, Figure 6 In the present embodiment, by limiting the relationship between the included angle β1 formed by the two conductor slots located between the two ends of the first air slot 41, the diameter Φ1 of the circle on which the side of the conductor slot 5 close to the rotating shaft is located, and the width l4 of the conductor slot 5 in the circumferential direction, the starting ability of the motor can be effectively enhanced, the time required for the motor to stabilize the rotating speed can be reduced, and the performance of the motor can be improved.

[0065] In one embodiment, the conductor slot 5 is an aluminum casting slot.

[0066] In the embodiment, the conductor groove 5 is an aluminum casting groove, the conductor is aluminum or aluminum alloy, the material structure is light, the electric conductivity is good, the cost is low, and the aluminum casting process is simple.

[0067] In one embodiment, the conductor can also be red copper or other electrically conductive and magnetically non-conductive material.

[0068] In one embodiment, the end of the rotor core 3 is provided with a cover plate 7, the cover plate 7 covers the conductor area, the cover plate 7 is provided with a communication hole 8, and the communication hole 8 is in one-to-one correspondence with the conductor groove 5.

[0069] In the embodiment, the cover plate 7 is a circular ring structure, the outer circle of the cover plate 7 has the same diameter as the rotor outer circle, the inner circle diameter of the cover plate 7 is smaller than the diameter of the circle where the inner edge of the conductor groove 5 near the rotor shaft is located, and the cover plate 7 is provided with a corresponding communication hole 8 only corresponding to the conductor groove 5, the cover plate 7 covers the end of the air groove 4, so that when the conductor is filled, the conductor can only enter the corresponding conductor groove 5 through the communication hole 8 and cannot enter the air groove 4, thereby avoiding the waste of the conductor caused by entering the air groove 4 during the filling process of the conductor.

[0070] According to the embodiment of the application, the motor comprises the rotor structure.

[0071] The rotor structure and the motor of the embodiment have the following effects:

[0072] The rotor structure makes the end of the air groove 4 forming the magnetic barrier layer extend into the conductor area for arranging the conductor groove 5, makes the air groove 4 occupy part of the position where the conductor groove 5 is arranged, can change the arrangement position of the conductor groove 5, reduce the area of the conductor groove 5, help to reduce the amount of the conductor in the conductor groove 5, change the magnetic density distribution, and further reduce the conductor loss, change the position of the conductor groove 5, change the arrangement position of the conductor, reduce the leakage of the rotor structure, reduce the harmonic magnetic field, and further reduce the current and the iron loss, and improve the motor efficiency.

[0073] The motor has fewer current harmonics, stronger starting ability, shorter required stabilization time, and stronger motor performance.

[0074] 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 application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component, and / or combination thereof.

[0075] It should be noted that the terms "first", "second", and the like, used in the description and in the claims of the present application as well as above-mentioned figures are used to distinguish between similar objects and not necessarily for describing a specific sequential or chronological order. It is to be understood that the use of data so designated is not meant to limit a given item described by such data to the same category as other data designated by the same designations, but instead is so designated only for convenience as a means of discriminating between the two series of items that refer to a same data.

[0076] The preferred embodiments of the application are only used to explain the application and not to limit the application. The application can be modified and changed by those skilled in the art. Any modification, equivalent replacement, improvement and the like within the spirit and principle of the application should be included in the protection scope of the application.

Claims

1. A rotor structure, characterized by, The rotor core (3) has air slots (4), permanent magnets (1) and conductor zones on the outer peripheral side, in a cross section perpendicular to the central axis of the rotor core (3), the number of the air slots (4) is at least two under one pole, at least two of the air slots (4) extend along the d-axis direction and form a magnetic barrier layer, the ends of the air slots (4) extend into the conductor zone, a plurality of conductor slots (5) are arranged in the conductor zone in the circumferential direction and are spaced apart, at least part of the conductor slots (5) are located between the ends of adjacent air slots (4), and the permanent magnets (1) are located at the middle positions of the air slots (4); The diameter of the circle where the end of the air slot (4) is located is Φ3, the diameter of the rotor outer circle is D1, the width of the tangential rib formed between the end of the air slot (4) and the rotor outer circle is (D1-Φ3) / 2, and 0.6mm≤(D1-Φ3) / 2≤1.3mm; The total area of the conductor slot (5) is S1, the cross-sectional area of the rotor core (3) is S, and 0.075*S≤S1≤0.076*S.

2. The rotor structure of claim 1, wherein Two adjacent air slots (4) are provided with one conductor slot (5) between the ends of the same end, and the conductor slot (5) is located at the middle position of the two adjacent air slots (4).

3. The rotor structure of claim 2, wherein In the q-axis direction from the rotor outer circle to the shaft hole, the air slot (4) includes a first air slot (41) and a second air slot (42) arranged in sequence, the conductor slot (5) includes a first conductor slot (51) located between the first air slot (41) and the second air slot (42), the distance between the end of the first air slot (41) and the end of the second air slot (42) is k1, the width of the first conductor slot (51) is l1, and 0.4*k1≤l1≤0.5*k1.

4. The rotor structure of claim 3, wherein The air slot (4) further includes a third air slot (43) arranged on the side of the second air slot (42) close to the shaft hole, and the conductor slot (5) further includes a second conductor slot (52) located between the second air slot (42) and the third air slot (43), the distance between the end of the second air slot (42) and the end of the third air slot (43) is k2, the width of the second conductor slot (52) is l2, and 0.42*k2≤l2≤0.55*k2.

5. The rotor structure of claim 2, wherein In the q-axis direction from the rotor outer circle to the shaft hole, the air slot (4) includes a first air slot (41), a second air slot (42) and a third air slot (43) arranged in sequence, the third air slots (43) of adjacent poles are adjacent, the conductor slot (5) includes a third conductor slot (53) located between adjacent third air slots (43), the distance between adjacent third air slots (43) is k3, the width of the third conductor slot (53) is l3, and 0.4*k3≤l3≤0.5*k3.

6. The rotor structure of claim 1, wherein In the q-axis direction from the outer circle of the rotor to the shaft hole, the air slot (4) comprises a first air slot (41), a second air slot (42) and a third air slot (43) arranged in sequence, the third air slots (43) of adjacent poles are adjacent, the conductor slot (5) comprises a first conductor slot (51), a second conductor slot (52) and a third conductor slot (53), the first conductor slot (51) is located between the first air slot (41) and the second air slot (42), the second conductor slot (52) is located between the second air slot (42) and the third air slot (43), and the third conductor slot (53) is located between adjacent third air slots (43).

7. The rotor structure of claim 6, wherein The middle width of the i-th air slot (4) is ci, and the end width is bi, 0.55bi≤ci≤0.65bi, wherein i=1, 2, 3.

8. The rotor structure of claim 6, wherein The corner is formed between the middle part and the two end parts of the first air slot (41), in the cross section perpendicular to the central axis of the rotor core (3), the included angle between the connecting line between the end point of the first air slot (41) and the central axis of the rotor core (3) and the q-axis is α1, the included angle between the connecting line between the inflection point of the first air slot (41) and the central axis of the rotor core (3) and the q-axis is θ1, 0.68α1≤θ1≤0.72α1; and / or, the corner is formed between the middle part and the two end parts of the second air slot (42), in the cross section perpendicular to the central axis of the rotor core (3), the included angle between the connecting line between the end point of the second air slot (42) and the central axis of the rotor core (3) and the q-axis is α2, the included angle between the connecting line between the inflection point of the second air slot (42) and the central axis of the rotor core (3) and the q-axis is θ2, 0.72α2≤θ2≤0.82α2; and / or, the corner is formed between the middle part and the two end parts of the third air slot (43), in the cross section perpendicular to the central axis of the rotor core (3), the included angle between the connecting line between the end point of the third air slot (43) and the central axis of the rotor core (3) and the q-axis is α3, the included angle between the connecting line between the inflection point of the third air slot (43) and the central axis of the rotor core (3) and the q-axis is θ3, 0.89α3≤θ3≤0.94α3.

9. The rotor structure of claim 1, wherein The diameter of the circle where the side of the conductor slot (5) close to the shaft is located is Φ1, and the diameter of the outer circle of the rotor is D1, 0.82*D1≤Φ1≤0.85*D1; and / or, the diameter of the circle where the side of the conductor slot (5) close to the outer circle of the rotor is located is Φ2, and the diameter of the outer circle of the rotor is D1, 0.87*D1≤Φ2≤0.99*D1.

10. The rotor structure of claim 1, wherein The air slot (4) located at the most outer radial side in the direction of the q-axis is a first air slot (41), in a cross section perpendicular to the central axis of the rotor core (3), the conductor slot (5) is arranged between the q-axis and the end of the first air slot (41), the included angle between the connecting line between the end point of the end of the first air slot (41) and the central axis of the rotor core (3) and the q-axis is α1, the two conductor slots (5) located on both sides of the q-axis and between the two ends of the first air slot (41) have mutually distant outer sides, the included angle between the two outer sides is β1, 1.16*α1≤β1≤1.3*α1.

11. The rotor structure of claim 10, wherein On one pole, three conductor slots (5) are arranged between the two ends of the first air slot (41), the widths of the three conductor slots (5) in the circumferential direction are the same and are l4, the diameter of the circle on which the side of the conductor slot (5) close to the rotation axis is located is Φ1, β1 / (2pi)*(Φ1*pi) / 6.2≤l4≤β1 / (2pi)*(Φ1*pi) / 5.

8.

12. The rotor structure of claim 1, wherein The conductor slot (5) is a cast aluminum slot.

13. The rotor structure of claim 1, wherein The end of the rotor core (3) is provided with a cover plate (7), the cover plate (7) covers the conductor area, the cover plate (7) is provided with a communication hole (8), and the communication hole (8) and the conductor slot (5) one-to-one correspond.

14. An electric machine comprising a rotor structure, characterized in that The rotor structure is the rotor structure of any one of claims 1 to 13.

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