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, in a cross section perpendicular to the central axis of the rotor core (3), the end of the air slot (4) extends into the conductor area under one pole, the permanent magnet (1) is located at the middle position of the air slot (4), the number of the air slots (4) is at least two, at least two air slots (4) extend along the d-axis direction and form magnetic barrier layers, the magnetic conducting channels (44) are formed between adjacent magnetic barrier layers, a plurality of conductor slots (5) are arranged in each magnetic conducting channel (44) along the extension direction of the air slot (4), the conductor slots (5) located in the same magnetic conducting channel (44) are distributed in the conductor areas at both ends of the magnetic conducting channel (44) and the middle part of the magnetic conducting channel (44). 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 conductor regions located on the outer periphery side, in a cross section perpendicular to the central axis of the rotor core, at one pole, the end of the air slot extends into the conductor region, the permanent magnet is located at the middle position of the air slot, the number of air slots is at least two, at least two air slots extend along the d-axis direction and form magnetic barrier layers, the magnetic flux channels are formed between adjacent magnetic barrier layers, a plurality of conductor grooves are arranged in each magnetic flux channel along the extension direction of the air slot, and the conductor grooves located in the same magnetic flux channel are distributed in the conductor regions at both ends of the magnetic flux channel and the middle part of the magnetic flux channel.

[0007] Further, the conductor groove is a circular groove.

[0008] Further, along the extension direction of the air slot, at least two conductor grooves are arranged in the conductor region at one end of the single magnetic flux channel, and at least one conductor groove is arranged in the middle part of the magnetic flux channel.

[0009] Further, the number of conductor grooves in a single magnetic flux channel is n1, 5≤n1≤9, and the diameters of the conductor grooves located in the same magnetic flux channel are the same. Further, the number of conductor grooves in a single magnetic flux channel is n1, 5≤n1≤9, and the diameters of the conductor grooves located in the same magnetic flux channel are the same.

[0010] Further, in the q-axis direction along the rotor outer circle to the shaft hole, the air slot includes a first air slot and a second air slot arranged in sequence, the conductor slot includes a first group of conductor slots 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 diameter of a single conductor slot of the first group of conductor slots is d1, and 0.4*k1≤d1≤0.5*k1.

[0011] Further, the air slot further includes a third air slot arranged on the side of the second air slot close to the shaft hole, and the conductor slot further includes a second group of conductor slots 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 diameter of a single conductor slot of the second group of conductor slots is d2, and 0.42*k2≤d2≤0.55*k2.

[0012] Further, in the q-axis direction along the rotor outer circle to the shaft hole, the air slot includes 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, the conductor slot includes a third group of conductor slots between the adjacent third air slots, the distance between the adjacent third air slots is k3, the diameter of a single conductor slot of the third group of conductor slots is d3, and 0.4*k3≤d3≤0.5*k3.

[0013] Further, in the q-axis direction along the rotor outer circle to the shaft hole, the air slot includes 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, the conductor slot includes a first group of conductor slots, a second group of conductor slots, and a third group of conductor slots, the first group of conductor slots is between the first air slot and the second air slot, the second group of conductor slots is between the second air slot and the third air slot, and the third group of conductor slots is between the adjacent third air slots.

[0014] 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.

[0015] Further, the corner is formed between the middle portion and the two end portions of the first air slot, in a cross section perpendicular to the central axis of the rotor core, the 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 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, 0.68α1≤θ1≤0.72α1; and / or, the corner is formed between the middle portion and the two end portions of the second air slot, in a cross section perpendicular to the central axis of the rotor core, the 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 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, 0.72α2≤θ2≤0.82α2; and / or, the corner is formed between the middle portion and the two end portions of the third air slot, in a cross section perpendicular to the central axis of the rotor core, the 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 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, 0.89α3≤θ3≤0.94α3.

[0016] Further, the diameter of the circle in which the center of the conductor slot located in the conductor area and close to the shaft hole is Φ1, the diameter of the rotor outer circle is D1, 0.7*D1≤Φ1≤0.85*D1; and / or, the diameter of the circle in which the center of the conductor slot located in the conductor area and close to the rotor outer circle is Φ2, the diameter of the rotor outer circle is D1, 0.87*D1≤Φ2≤0.99*D1.

[0017] Further, the diameter of the circle in which the end point of the air slot 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 and the rotor outer circle is (D1-Φ3) / 2, 0.6mm≤(D1-Φ3) / 2≤1.3mm.

[0018] Further, the total area of the conductor slot is S1, the cross-sectional area of the rotor core is S, 0.075*S≤S1≤0.076*S.

[0019] Further, the air slot located at the most outer side in the radial direction along the q-axis direction is the first air slot, in a cross section perpendicular to the central axis of the rotor core, the conductor slot is arranged between the q-axis and the end of the first air slot, the line connecting the end point of the first air slot and the central axis of the rotor core is the first line, the angle between the first line and the q-axis is α1, the angle formed between the line connecting the center of the two conductor slots located between the two ends of the first air slot and on the two sides of the q-axis and farthest from the q-axis and the central axis of the rotor core is β1, 1.1*α1≤β1≤1.3*α1.

[0020] Further, five groups of conductor grooves are arranged between the two ends of the first air groove, each group of conductor grooves including at least two radially arranged conductor grooves, and the five groups of conductor grooves are uniformly spaced along the circumferential direction of the rotor core.

[0021] Further, the conductor grooves are cast aluminum grooves.

[0022] Further, the end cover of the rotor core is provided with a cover plate, and a communication hole is formed in the cover plate and communicates with the conductor grooves one by one.

[0023] According to another aspect of the present application, there is provided an electric machine comprising the above-mentioned rotor structure.

[0024] According to the technical scheme of the present application, the rotor structure comprises a rotor core, the rotor core has air grooves, permanent magnets, and conductor regions located on the outer circumferential side, in a cross section perpendicular to the central axis of the rotor core, at one pole, the ends of the air grooves extend into the conductor regions, the permanent magnets are located at the middle positions of the air grooves, the number of air grooves is at least two, at least two air grooves extend along the d-axis direction and form magnetic barrier layers, the magnetic flux conducting channels are formed between adjacent magnetic barrier layers, a plurality of conductor grooves are arranged in each magnetic flux conducting channel along the extension direction of the air grooves, and the conductor grooves located in the same magnetic flux conducting channel are distributed in the conductor regions at both ends of the magnetic flux conducting channel and in the middle part of the magnetic flux conducting channel. The rotor structure makes the ends of the air grooves forming the magnetic barrier layers extend into the conductor regions for arranging the conductor grooves, occupies part of the positions for arranging the conductor grooves, changes the arrangement positions of the conductor grooves, reduces the area of the conductor grooves, helps to reduce the amount of conductors in the conductor grooves, changes the magnetic flux density distribution, and further reduces the conductor loss, changes the arrangement positions of the conductor grooves, reduces the leakage magnetic flux of the rotor structure, reduces the harmonic magnetic field, and further reduces the current and iron loss, and improves the efficiency of the electric machine; the conductor grooves located in the same magnetic flux conducting channel are distributed in the conductor regions at both ends of the magnetic flux conducting channel and in the middle part of the magnetic flux conducting channel, which can adjust the magnetic field located at both ends and the middle part of the magnetic flux conducting channel along the magnetic circuit direction, thereby more effectively improving the current waveform and reducing the magnetic field harmonics. BRIEF DESCRIPTION OF DRAWINGS

[0025] The drawings constituting a part of the specification of the present application are used to provide a further understanding of the present application, the illustrative embodiments of the present application and the description thereof serve to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0026] Figure 1 A structural schematic diagram of a rotor structure of an embodiment of the present application is shown;

[0027] Figure 2 A partial enlarged structural diagram of a rotor structure of an embodiment of the present application is shown;

[0028] Figure 3 A cover plate structure diagram of a rotor structure of an embodiment of the application is shown;

[0029] Figure 4 A torque comparison diagram of a motor of an embodiment of the application and a related art motor is shown;

[0030] Figure 5 A current harmonic comparison diagram of a motor of an embodiment of the application and a related art motor is shown; and

[0031] Figure 6 A rotational speed comparison diagram of a motor of an embodiment of the application and a related art motor is shown.

[0032] Among the above drawings, the following reference signs are included:

[0033] 1, permanent magnet; 2, rotor lamination; 3, rotor core; 4, air slot; 41, first air slot; 42, second air slot; 43, third air slot; 44, magnetic flux guide channel; 5, conductor slot; 51, first group of conductor slots; 52, second group of conductor slots; 53, third group of conductor slots; 6, positioning hole; 7, cover plate; 8, communication hole. DETAILED DESCRIPTION

[0034] 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 drawings and in combination with the embodiments.

[0035] For reference Figures 1 to 6 As shown, according to an 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 conductor regions located at the outer peripheral side, in a cross section perpendicular to the central axis of the rotor core 3, at one pole, the ends of the air slots 4 extend into the conductor regions, the permanent magnets 1 are located at the middle positions of the air slots 4, the number of the air slots 4 is at least two, the at least two air slots 4 extend along the d-axis direction and form magnetic barrier layers, the magnetic flux guide channels 44 are formed between adjacent magnetic barrier layers, a plurality of conductor slots 5 are arranged in each magnetic flux guide channel 44 along the extension direction of the air slots 4, the conductor slots 5 located in the same magnetic flux guide channel 44 are distributed in the conductor regions at both ends of the magnetic flux guide channel 44 and the middle part of the magnetic flux guide channel 44.

[0036] The rotor structure makes the ends of the air slots 4 forming the magnetic barrier layers extend into the conductor regions 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 and change the magnetic flux density distribution, thereby reducing the conductor loss, and changing the positions of the conductor slots 5 can change the arrangement positions of the conductors, so that the leakage magnetic of the rotor structure is reduced, the harmonic magnetic field is reduced, thereby reducing the current and iron loss and improving the motor efficiency.

[0037] The plurality of conductor grooves 5 in the same magnetic flux channel 44 are simultaneously distributed in the conductor area at both ends of the magnetic flux channel 44 and the middle part of the magnetic flux channel 44, which can adjust the magnetic field at both ends and the middle part of the magnetic flux channel 44 along the magnetic circuit direction, thereby more effectively improving the current waveform and reducing the magnetic field harmonic.

[0038] The permanent magnet 1 arranged in the air slot 4 can play the role of auxiliary magnetic field by the permanent magnet 1, and enhance the performance of the reluctance motor. The magnetic field generated by the permanent magnet 1 can improve the magnetic field density of the motor, thereby increasing the output power and efficiency of the motor. In addition, the permanent magnet 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.

[0039] 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 a plurality of air slots 4, conductor grooves 5 and positioning holes 6 are arranged on the rotor core 3, wherein the positioning holes 6 are arranged on one side of the air slot 4 close to the shaft hole, and are used to realize the connection and fixation of the rotor laminations 2.

[0040] The conductor grooves 5 are arranged in the circumferential direction along the outer periphery of the rotor core 3, and are filled with electrically conductive and magnetically non-conductive material, which forms a conductor, so that the motor has self-starting ability.

[0041] In one embodiment, the conductor groove 5 is a circular groove.

[0042] The conductor groove 5 adopts a circular groove structure, which makes the structure of the conductor groove 5 more easily processed, and the area of the conductor groove 5 more easily controlled, improves the design precision of the conductor groove 5, and more effectively utilizes the conductor in the conductor groove 5 to control the self-starting ability of the motor.

[0043] In one embodiment, along the extension direction of the air slot, at least two conductor grooves are arranged in the conductor area at one end of the single magnetic flux channel 44, and at least one conductor groove is arranged in the middle part of the magnetic flux channel 44, and the number of conductor grooves at both ends of the magnetic flux channel 44 is greater than that in the middle part.

[0044] In this embodiment, at least two conductor grooves 5 are arranged in the conductor area at one end of the single magnetic flux channel 44, and at least one conductor groove 5 is arranged in the middle part of the magnetic flux channel 44, so that more conductor grooves 5 are arranged at both ends of the magnetic flux channel 44 which have greater influence on the magnetic flux distribution, and fewer conductor grooves 5 are arranged in the middle part which have less influence on the magnetic flux distribution, which can not only ensure the number of conductor grooves 5 in the magnetic flux channel 44 and the starting ability of the motor, but also avoid the influence of too many conductor grooves 5 in the middle part of the magnetic flux channel 44 on the magnetic circuit, thereby improving the output ability of the motor on the basis of improving the magnetic flux distribution.

[0045] In one embodiment, the number of conductor slots in a single magnetic flux channel 44 is n1, 5≤n1≤9, and the diameters of the conductor slots located in the same magnetic flux channel 44 are the same. This kind of structural design can not only increase the mechanical strength of the rotor structure, but also improve the magnetic field distribution on the rotor structure and improve the motor performance.

[0046] In one embodiment, two conductor slots 5 are arranged between the ends of the same end of the two adjacent air slots 4, both of which are located in the conductor area and are arranged at intervals along the extension direction of the air slot 4, and both of which are located at the middle position of the magnetic flux channel 44 along the width direction of the magnetic flux channel 44.

[0047] In this embodiment, two conductor slots 5 are arranged between the ends of the same end of the two adjacent air slots 4, and the conductor slots 5 are located at the middle position of the width direction of the magnetic flux channel 44. 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, it can make the spacing between the conductor slots 5 and the two adjacent air slots 4 the same, thereby improving the self-starting performance of the motor.

[0048] 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 group of conductor slots 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 diameter of a single conductor slot of the first group of conductor slots 51 is d1, and 0.4*k1≤d1≤0.5*k1.

[0049] 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 group of conductor slots 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 diameter of a single conductor slot of the second group of conductor slots 52 is d2, and 0.42*k2≤d2≤0.55*k2.

[0050] 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 group of conductor slots 53 located between the adjacent third air slots 43. The distance between the adjacent third air slots 43 is k3, the diameter of a single conductor slot of the third group of conductor slots 53 is d3, and 0.4*k3≤d3≤0.5*k3.

[0051] In the embodiment, the diameter of the circular slot is defined by the spacing between the adjacent air slots 4, so that the diameter of the circular slot is within a reasonable range, which can avoid the diameter of the circular slot being too large to affect the structural strength of the rotor structure, and can also avoid the diameter of the circular slot being too small to affect the starting ability of the motor, so that the current waveform of the motor can be effectively improved.

[0052] Referring to Figure 5 As shown, by defining the relationship between the spacing between the ends of the adjacent air slots 4 and the diameter of the single conductor slot 5 between the adjacent air slots 4, the 5th, 17th, 19th and 23rd current harmonics can be effectively reduced, thereby reducing the harmonic magnetic field, changing the magnetic flux density distribution, reducing the conductor loss and improving the motor efficiency.

[0053] 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, the third air slots 43 of adjacent poles are adjacent, the conductor slot 5 includes a first group of conductor slots 51, a second group of conductor slots 52 and a third group of conductor slots 53, the first group of conductor slots 51 is located between the first air slot 41 and the second air slot 42, the second group of conductor slots 52 is located between the second air slot 42 and the third air slot 43, and the third group of conductor slots 53 is located between the adjacent third air slots 43.

[0054] Referring to Figure 4 As shown, in the embodiment, under one pole, there are three air slots 4, which are a first air slot 41, a second air slot 42 and a third air slot 43, the first group of conductor slots 51 is arranged between the first air slot 41 and the second air slot 42, the second group of conductor slots 52 is arranged between the second air slot 42 and the third air slot 43, and the third group of conductor slots 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.

[0055] 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.

[0056] In the embodiment, the air slot 4 is three, which are 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, the middle width of the third air slot 43 is c3, and the end width is b3.

[0057] By defining 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, so as to increase the mechanical strength of the rotor structure and improve the stability and reliability of the motor.

[0058] In one embodiment, the corner is formed between the middle portion and the two end portions of the first air slot 41, and in the cross section perpendicular to the center axis of the rotor core 3, the angle between the line connecting the end point of the first air slot 41 and the center axis of the rotor core 3 and the q-axis is α1, the angle between the line connecting the corner point of the first air slot 41 and the center axis of the rotor core 3 and the q-axis is θ1, and 0.68α1≤θ1≤0.72α1.

[0059] In one embodiment, the corner is formed between the middle portion and the two end portions of the second air slot 42, and in the cross section perpendicular to the center axis of the rotor core 3, the angle between the line connecting the end point of the second air slot 42 and the center axis of the rotor core 3 and the q-axis is α2, the angle between the line connecting the corner point of the second air slot 42 and the center axis of the rotor core 3 and the q-axis is θ2, and 0.72α2≤θ2≤0.82α2.

[0060] In one embodiment, the corner is formed between the middle portion and the two end portions of the third air slot 43, and in the cross section perpendicular to the center axis of the rotor core 3, the angle between the line connecting the end point of the third air slot 43 and the center axis of the rotor core 3 and the q-axis is α3, the angle between the line connecting the corner point of the third air slot 43 and the center axis of the rotor core 3 and the q-axis is θ3, and 0.89α3≤θ3≤0.94α3.

[0061] 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 is also defined, which reduces the adverse effect of the air slot 4 on the mechanical strength of the rotor structure, enhances the mechanical strength of the rotor structure, and also optimizes the structure of the air slot 4, thereby increasing the output capacity of the motor.

[0062] In one embodiment, the diameter of the circle with the center of the conductor slot 5 located in the conductor area and close to the shaft hole is Φ1, and the diameter of the outer circle of the rotor is D1, and 0.82*D1≤Φ1≤0.85*D1.

[0063] In one embodiment, the diameter of the circle with the center of the conductor slot 5 located in the conductor area and close to the outer circle of the rotor is Φ2, and the diameter of the outer circle of the rotor is D1, and 0.87*D1≤Φ2≤0.99*D1.

[0064] Through the above definition, the magnetic flux density distribution between the air slots 4 can be changed, the iron loss is reduced, and the output capacity of the motor is improved.

[0065] In one embodiment, the diameter of the circle where the end 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 of the air slot 4 and the outer circle of the rotor and extending in the circumferential direction.

[0066] In the present embodiment, by limiting the thickness of the tangential rib, it is possible to avoid the thickness of the tangential rib being too small, thereby ensuring the structural strength of the rotor structure, and also to avoid the thickness of the tangential rib being too large, thereby effectively reducing the magnetic flux leakage of the motor and reducing the torque ripple.

[0067] In one embodiment, the total area of the conductor slot 5 is S1, and the cross-sectional area of the rotor core 3 is S, and 0.075*S≤S1≤0.076*S.

[0068] 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.

[0069] 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, a conductor slot 5 is arranged between the q-axis and the end of the first air slot 41, 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 is a first connecting line, the included angle between the first connecting line and the q-axis is α1, the included angle formed by the connecting line between the center of the two conductor slots 5 located between the two ends of the first air slot 41 and on the two sides of the q-axis and farthest from the q-axis and the central axis of the rotor core 3 is β1, and 1.1*α1≤β1≤1.3*α1.

[0070] In the present embodiment, the two conductor slots 5 are located between the two ends of the first air slot 41 and on the two sides of the q-axis and farthest from the q-axis.

[0071] By limiting the relationship between the included angle formed by the connecting line between the center of the two conductor slots 5 and the central axis of the rotor core 3 and the included angle between the first connecting line and the q-axis, the setting position of the conductor slot 5 between the two ends of the first air slot 41 can be limited, so that the positions of the two conductor slots 5 on the two sides of the q-axis are set more reasonably, the starting torque of the motor during asynchronous starting is larger, and the stable state can be reached more quickly.

[0072] In one embodiment, five groups of the conductor grooves 5 are arranged between the two ends of the first air groove 41, each group of the conductor grooves includes at least two radially arranged conductor grooves, and the five groups of the conductor grooves 5 are uniformly spaced along the circumference of the rotor core 3.

[0073] With reference to Figure 6 As shown in the drawings, in the embodiment, by arranging five groups of the conductor grooves 5 which are uniformly distributed along the circumference between the two ends of the first air groove 41, and each group of the conductor grooves 5 includes two radially spaced conductor grooves, a double-layer circular groove structure can be formed, which can effectively enhance the starting ability of the motor, reduce the time required for the motor speed to stabilize, and improve the performance of the motor.

[0074] In one embodiment, the conductor grooves 5 are cast aluminum grooves.

[0075] In the embodiment, the conductor grooves 5 are cast aluminum grooves, and the conductor is aluminum or aluminum alloy, which has light material structure, good electrical conductivity, and low cost, and the cast aluminum process is simple.

[0076] In one embodiment, the conductor can also be red copper or other electrically conductive and magnetically non-conductive materials.

[0077] In one embodiment, the end of the rotor core 3 is provided with a cover plate 7, the cover plate 7 is arranged on 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.

[0078] In one embodiment, the conductor groove 5 is a circular groove, the communication hole 8 is also a circular groove, and the diameter of the communication hole 8 is the same as the diameter of the conductor groove 5.

[0079] 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 outer circle of the rotor, the inner circle of the cover plate 7 has the same diameter as the shaft hole or slightly larger than the diameter of the shaft hole, and the cover plate 7 is only provided with a corresponding communication hole 8 corresponding to the conductor groove 5, and 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.

[0080] In one embodiment, the rotor lamination 2 is symmetric about the d-axis or the q-axis, or symmetric about the center axis, so that the stability of the motor can be increased by using the symmetric structure.

[0081] According to the embodiment of the application, the motor includes the rotor structure.

[0082] The rotor structure and the motor of the embodiment have the following effects:

[0083] The rotor structure makes the end of the air slot 4 forming the magnetic barrier layer extend into the conductor area for arranging the conductor slot 5, so that the air slot 4 occupies part of the position for arranging the conductor slot 5, the arrangement position of the conductor slot 5 can be changed, the area of the conductor slot 5 is reduced, the amount of the conductor in the conductor slot 5 is reduced, the magnetic density distribution is changed, the conductor loss is reduced, the arrangement position of the conductor is changed, the leakage 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.

[0084] The plurality of conductor slots 5 in the same magnetic flux channel 44 are distributed in the conductor area at both ends of the magnetic flux channel 44 and the middle part of the magnetic flux channel 44, which can adjust the magnetic field at both ends and the middle part of the magnetic flux channel 44 along the magnetic path direction, so as to more effectively improve the current waveform and reduce the magnetic field harmonic.

[0085] The motor has less current harmonics, stronger starting ability, shorter stabilization time, and stronger motor performance.

[0086] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0087] It should be noted that the terms "first", "second", and the like, as used in the specification and claims herein are intended to modify any one of the features, steps, operations, elements, components, and / or combinations thereof, but do not require a particular order among or between the features, steps, operations, elements, components, and / or combinations thereof unless otherwise expressly indicated herein.

[0088] The preferred embodiments of the present application have been described above with the aid of drawing figures, and are not limited to the embodiments per se, and various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A rotor structure, characterized by, The rotor core (3) has air slots (4), permanent magnets (1) and conductor regions on the outer circumferential side. In a cross section perpendicular to the central axis of the rotor core (3), the end of the air slot (4) extends into the conductor region under one pole, the permanent magnet (1) is located at the middle position of the air slot (4), the number of air slots (4) is at least two, at least two air slots (4) extend along the d-axis direction and form magnetic barrier layers, the magnetic flux channel (44) is formed between adjacent magnetic barrier layers, a plurality of conductor slots (5) are arranged in each magnetic flux channel (44) along the extension direction of the air slot (4), and the conductor slots (5) located in the same magnetic flux channel (44) are distributed in the conductor regions at both ends of the magnetic flux channel (44) and the middle part of the magnetic flux channel (44); the conductor slot is a circular slot; along the extension direction of the air slot, at least two conductor slots are arranged in the conductor region at one end of the single magnetic flux channel (44), and at least one conductor slot is arranged in the middle part of the magnetic flux channel (44); 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 The number of conductor slots in a single magnetic flux channel (44) is n1, 5≤n1≤9, and the diameters of the conductor slots located in the same magnetic flux channel (44) are the same.

3. The rotor structure of claim 1, wherein In the q-axis direction, along the direction from the rotor outer circle to the shaft hole, the air slot (4) comprises a first air slot (41) and a second air slot (42) arranged in sequence, the conductor slot (5) comprises a first group of conductor slots (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 diameter of a single conductor slot of the first group of conductor slots (51) is d1, and 0.4*k1≤d1≤0.5*k1.

4. The rotor structure of claim 3, wherein The air slot (4) further comprises 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 comprises a second group of conductor slots (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 diameter of a single conductor slot of the second group of conductor slots (52) is d2, and 0.42*k2≤d2≤0.55*k2.

5. 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 third group of conductor slots (53) located between adjacent third air slots (43), the distance between adjacent third air slots (43) is k3, the diameter of a single conductor slot of the third group of conductor slots (53) is d3, and 0.4*k3≤d3≤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 group of conductor slots (51), a second group of conductor slots (52) and a third group of conductor slots (53), the first group of conductor slots (51) is located between the first air slot (41) and the second air slot (42), the second group of conductor slots (52) is located between the second air slot (42) and the third air slot (43), and the third group of conductor slots (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, and 0.55bi≤ci≤0.65bi, where i=1, 2, 3.

8. The rotor structure of claim 6, wherein An inflection point is formed between the middle part and the two end parts of the first air slot (41), in a 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, and 0.68α1≤θ1≤0.72α1; and / or, an inflection point is formed between the middle part and the two end parts of the second air slot (42), in a 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, and 0.72α2≤θ2≤0.82α2; and / or, an inflection point is formed between the middle part and the two end parts of the third air slot (43), in a 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, and 0.89α3≤θ3≤0.94α3.

9. The rotor structure of claim 1, wherein A diameter of a circle where centers of the conductor slots (5) located in the conductor area and close to the shaft hole are located is Φ1, a diameter of an outer circle of the rotor is D1, and 0.7*D1≤Φ1≤0.85*D1; and / or, a diameter of a circle where centers of the conductor slots (5) located in the conductor area and close to the outer circle of the rotor are located is Φ2, the diameter of the outer circle of the rotor is D1, and 0.87*D1≤Φ2≤0.99*D1.

10. The rotor structure of claim 1, wherein The air slot (4) located at the most outer side in the radial direction along the q-axis direction is a first air slot (41), in a cross section perpendicular to a central axis of the rotor core (3), the conductor slots (5) are arranged between the q-axis and ends of the first air slot (41), a line between an end point of the end of the first air slot (41) and the central axis of the rotor core (3) is a first line, an included angle between the first line and the q-axis is α1, an included angle between a line between the central axes of two conductor slots (5) located between the two ends of the first air slot (41) and on both sides of the q-axis and farthest from the q-axis and the central axis of the rotor core (3) is β1, and 1.1*α1≤β1≤1.3*α1.

11. The rotor structure of claim 10, wherein Five groups of the conductor slots (5) are arranged between the two ends of the first air slot (41), each group of the conductor slots includes at least two conductor slots arranged in the radial direction, and the five groups of the conductor slots (5) are uniformly and spacedly arranged along a circumferential direction of the rotor core (3) around the shaft hole.

12. The rotor structure of claim 1, wherein The conductor slots (5) are cast aluminum slots.

13. The rotor structure of claim 1, wherein An end portion of the rotor core (3) is provided with a cover plate (7), 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 slots (5).

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

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