Rotors, motors, compressors, air conditioners, vehicles

Abstract

The present invention provides a rotor, a motor, a compressor, an air conditioner, and a vehicle. The rotor comprises: a rotor core having a plurality of magnet slots disposed on the rotor core, the magnet slots being located on the circumference of the rotor core; and permanent magnets disposed within the magnet slots, wherein the cross-sectional profile of the permanent magnet on the side opposite the magnet slots includes at least one straight line. The rotor provided by the present invention maximizes the use of permanent magnets, reduces copper loss, and thereby improves motor efficiency. Furthermore, the thickness of the rotor's permanent magnets is non-uniform, which reduces torque ripple, lowers the harmonic content of the air gap flux density, and further improves motor efficiency, thereby achieving motor miniaturization.

Description

Technical Field

[0001] The present invention relates to the technical field of permanent magnet synchronous motors, and in particular to a rotor, a motor, a compressor, an air conditioner and a vehicle. Background Art

[0002] The variable frequency permanent magnet synchronous motor rotor magnet commonly used in related technologies adopts a tile-type surface-mount rotor structure, which makes it difficult to install the permanent magnet. After installation, the permanent magnet has low mechanical strength and cannot meet the requirements of high-speed operation. The thickness of the permanent magnet is designed to be uniform, the torque pulsation of the motor is large, the air gap magnetic density harmonic content is high, the motor iron loss and stray loss are large, and the motor efficiency is reduced. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0004] To this end, a first aspect of the present invention provides a rotor.

[0005] A second aspect of the present invention provides an electric motor.

[0006] A third aspect of the present invention provides a compressor.

[0007] A fourth aspect of the present invention provides an air conditioner.

[0008] A fifth aspect of the present invention provides a vehicle.

[0009] In view of this, the present invention provides a rotor, which includes: a rotor core, a plurality of magnet slots are provided on the rotor core, and the magnet slots are located on the circumferential side of the rotor core; a permanent magnet, the permanent magnet is arranged in the magnet slots, and the cross-sectional contour line of the permanent magnet on the side opposite to the magnet slots includes at least one straight line.

[0010] The rotor provided by the present invention includes a rotor core and a permanent magnet. A plurality of magnet slots are provided on the circumferential side of the rotor core, and permanent magnets are provided in the magnet slots. The cross-sectional contour line of the permanent magnet on the side opposite to the magnet slots includes at least one straight line. The rotor provided by the present invention, by providing magnet slots on the circumferential side of the rotor core for arranging permanent magnets, on the one hand, allows the permanent magnets to be arranged on the circumferential side of the rotor core, thereby increasing the usable space of the cross section of the rotor core; on the other hand, by arranging the permanent magnets in the magnet slots, the permanent magnets are more closely fitted to the rotor core after installation, and the mechanical strength of the rotor is high, meeting the requirements of high-speed operation. Furthermore, the contour line of the permanent magnet on the side away from the rotor core includes at least one straight line, so that the thickness of the permanent magnet is uneven, thereby reducing the torque pulsation of the motor, reducing the harmonic content of the air gap magnetic density, reducing the iron loss and stray loss of the motor, improving the efficiency of the motor, and improving the noise of the motor.

[0011] According to the rotor provided by the present invention, compared with the "I"-shaped permanent magnets arranged in the current rotor, the amount of permanent magnets used is maximized, copper loss is reduced, thereby improving motor efficiency and realizing motor miniaturization; compared with the "V"-shaped permanent magnets arranged in the current rotor, the rotor provided by the present invention has a larger space on the cross-section of the rotor core, which can be used to design rotor flow holes, and the rotor flow area is large, so that the motor can be miniaturized under a large-displacement compressor to meet large refrigerant flow; compared with the current tile-type surface-mounted rotor structure, the rotor provided by the present invention has a permanent magnet that fits more closely with the rotor core after installation, has high mechanical strength, meets high-speed operation requirements, and the thickness of the permanent magnets of the rotor is not uniform, so that the torque pulsation of the motor is small, the harmonic content of the air gap magnetic density is reduced, the iron loss and stray loss of the motor are reduced, the motor efficiency is improved, the motor torque pulsation is small, and the motor noise is improved.

[0012] In addition, the rotor in the above technical solution provided by the present invention may also have the following additional technical features:

[0013] In the above technical solution, preferably, at least one straight line is parallel to the cross-sectional contour line of the permanent magnet located inside the magnet slot.

[0014] In this technical solution, by setting at least one straight line parallel to the contour line on the side of the magnet slot, at least one straight line is located in the middle position of the outer contour line of the permanent magnet. On the one hand, a better effect of small torque pulsation can be achieved; on the other hand, during the assembly process, assembly is facilitated to meet the manufacturing requirements of the rotor.

[0015] In any of the above technical solutions, preferably, the length of at least one straight line is L1, the width of the permanent magnet located in the magnet slot is L2, and the ratio of L1 to L2 is greater than or equal to 0.05 and less than or equal to 0.7.

[0016] In this technical solution, the ratio between the straight segment and the width of the permanent magnet is reasonably set to adjust the torque pulsation of the rotor to achieve the optimal state, thereby reducing the motor's iron loss and stray loss, improving the motor's efficiency, and improving the motor's noise.

[0017] In any of the above technical solutions, preferably, the side of the permanent magnet facing the magnet slot is a plane, the side opposite to the plane is a convex surface, and both side surfaces of the permanent magnet are planes; wherein the contour line corresponding to the convex surface includes at least one straight line.

[0018] In this technical solution, the permanent magnet has a convex structure, and the cross-sectional contour of the permanent magnet includes two oppositely arranged groups of straight segments and two arcs. One end of one of the two groups of straight segments is connected to the two ends of one of the other groups of straight segments, and the two ends of another of the other groups of straight segments are connected to one end of the two arcs. The other ends of the two arcs are connected to the other ends of the two groups of straight segments. Specifically, the contour corresponding to the convex surface includes two arcs and one straight segment. By setting the thickness of the permanent magnet to be non-uniform, the torque pulsation of the motor is reduced, the harmonic content of the air gap magnetic flux density is reduced, the motor iron loss and stray loss are reduced, the motor efficiency is improved, the motor torque pulsation is reduced, and the motor noise is improved.

[0019] In any of the above technical solutions, preferably, the permanent magnet is partially disposed in the magnet slot, and the side of the permanent magnet away from the magnet slot protrudes from the circumferential surface of the rotor core.

[0020] In this technical solution, by setting magnet slots on the circumferential side of the rotor core for arranging permanent magnets, the amount of permanent magnets used is increased and the usable space of the cross section of the rotor core is increased; by partially arranging the permanent magnets in the magnet slots and the permanent magnets protruding from the circumferential outer surface of the rotor core, the permanent magnets fit more closely with the rotor core after installation, the rotor has high mechanical strength, and meets the requirements of high-speed operation.

[0021] In any of the above technical solutions, preferably, the rotor further includes: a limiting protrusion, which is provided on the rotor core and located between two adjacent magnet slots.

[0022] In this technical solution, by setting a limiting protrusion between two adjacent magnet slots on the rotor core, it is convenient to install the permanent magnet into the magnet slot, and the limiting protrusion contacts the permanent magnet, which increases the connection area of ​​the permanent magnet, further ensures the mechanical strength of the permanent magnet after installation, and thus meets the requirements of high-speed operation of the rotor.

[0023] In any of the above technical solutions, preferably, the distance from the protruding end of the limiting protrusion to the geometric center of the rotor core is L3; the distance from the tangent of any point on the side of the limiting protrusion close to the cross-sectional contour line of the permanent magnet on the side opposite to the magnet slot to the geometric center of the rotor core is L4, and L3 and L4 satisfy: 0.5mm≤L4-L3≤3mm.

[0024] In this technical solution, the size parameters of the limiting protrusion and the permanent magnet are reasonably set to meet the above range requirements, which can increase the magnetic resistance of the q-axis magnetic circuit, reduce the q-axis inductance Lq, reduce the inter-pole leakage flux, and improve the operating efficiency of the motor.

[0025] In any of the above technical solutions, preferably, the rotor further includes: a center hole, which is provided on the rotor core and is used to pass the shaft of the motor; a rivet hole, which is provided on the rotor core; and a flow hole, which is provided on the rotor core.

[0026] In this technical solution, the rotor core is provided with a center hole, rivet holes, and flow holes. The center hole is used to pass the motor shaft, the rivet holes are used to connect rivets, and the flow holes are used to circulate the refrigerant. The rotor provided by the present invention, by arranging permanent magnets on the circumference of the rotor core, thereby providing a larger usable area on the rotor core, thereby increasing the number of flow holes provided, thereby increasing the rotor flow area. This allows the motor to be miniaturized in large-displacement compressors to meet the requirements of large refrigerant flow.

[0027] In any of the above technical solutions, preferably, the through-holes include a first layer of through-holes and a second layer of through-holes; the first layer of through-holes is located between adjacent rivet holes, and the number of the first layer of through-holes is multiple; the second layer of through-holes is located on the side of the rotor core close to the center hole, and the number of the second layer of through-holes is multiple.

[0028] In this technical solution, two layers of flow holes are provided between the outer edge of the rotor core and the rotor shaft hole. A first layer of flow holes is located between adjacent rivet holes, while a second layer of flow holes is located closer to the rotor center hole. Multiple holes are provided on both the first and second layers. This dual layer of flow holes reduces rotor weight and increases the flow hole area, meeting the requirements for high refrigerant flow in large-displacement compressors with miniaturized motors.

[0029] In any of the above technical solutions, preferably, the rivet hole is located between adjacent magnet slots, and the minimum distance L5 from the rivet hole to the permanent magnet and the minimum distance L6 between the rivet hole and the second-layer flow hole satisfy: 1.2≤L5 / L6≤3.

[0030] In this technical solution, rivet holes are placed between adjacent magnetic poles. The minimum distance between the rivet holes and the permanent magnets is L5, and the minimum distance between the rivet holes and the second-layer flow holes is L6, satisfying the following relationship: 1.2 ≤ L5 / L6 ≤ 3. This arrangement ensures the permanent magnet's magnetic circuit requirements, prevents magnetic circuit saturation, minimizes impact on the permanent magnet's magnetic circuit, and improves permanent magnet utilization.

[0031] In any of the above technical solutions, preferably, the first layer of flow holes is located on the line connecting the geometric center of the permanent magnet and the geometric center of the center hole; the second layer of flow holes is located on the line connecting the geometric center of the rivet hole to the geometric center of the center hole.

[0032] In this technical solution, a layer of flow holes is arranged on the axis of the line connecting the center of the permanent magnet to the center hole of the rotor, which can reduce the q-axis inductance. At the same time, the area of ​​the first layer of flow holes is large; the second layer of flow holes is arranged on the axis of the line connecting the center of the rivet hole to the center hole of the rotor, and is staggered with the first layer of flow holes. On the basis of increasing the flow area, the mechanical strength of the rotor core is further guaranteed.

[0033] In any of the above technical solutions, preferably, the electromagnetic steel plates are stacked to form the rotor core; and the thickness of a single electromagnetic steel plate is less than or equal to 0.5 mm.

[0034] In this technical solution, the rotor core is composed of multiple stacked electromagnetic steel plates, which are used to increase axial electrical insulation and reduce eddy current losses. The rotor core obtained by stacking the electromagnetic steel plates in sheets reduces the path of eddy current flow and thus effectively reduces eddy current losses. Furthermore, the thickness of the electromagnetic steel plates of the stacked rotor core is less than or equal to 0.5 mm, so that the eddy current loss of the rotor core is small, thereby improving the operating efficiency of the motor.

[0035] In any of the above technical solutions, preferably, the permanent magnet is glued to the magnet slot by glue, and the adhesive force of the glue is greater than or equal to 27.6 MPa; the permanent magnet is a rare earth neodymium iron boron magnet.

[0036] In this technical solution, the permanent magnets are glued to the permanent magnet slots with an adhesive force greater than 27.6Mpa to ensure the mechanical strength of the rotor when running at high speeds; the rare earth neodymium iron boron magnets have high magnetic properties, ensuring the operating stability and efficiency of the motor.

[0037] In any of the above technical solutions, preferably, the contact surface between the permanent magnet and the magnet slot is rectangular.

[0038] In this technical solution, a rectangle is used as the contact surface between the permanent magnet and the magnet slot, which can increase the contact area between the permanent magnet and the magnet slot. Compared with the contact surface being an arc, the processing accuracy of the rectangular surface is higher than that of the arc surface, so that the permanent magnet and the rotor core are in close contact and the glue is evenly applied, which makes the installation of the permanent magnet easier. After the permanent magnet is installed, the mechanical strength is higher and can meet the requirements of high-speed operation.

[0039] In any of the above technical solutions, preferably, the permanent magnets, rivet holes, and flow holes are all arranged in a centrosymmetrical manner around the geometric center of the rotor core.

[0040] In this technical solution, the permanent magnets, rivet holes, and flow holes are all arranged in a centrally symmetrical manner around the geometric center of the rotor core, which can evenly distribute the weight of the rotor and is less likely to generate vibration and noise during high-speed operation.

[0041] According to a second aspect of the present invention, a motor is provided, comprising: a stator, the stator comprising a rotor hole; and a rotor as described in any of the above technical solutions, the rotor being disposed in the rotor hole.

[0042] According to the motor provided by the present invention, the amount of permanent magnets used is maximized, the purpose of increasing the magnetic load is achieved, and the high power density of the motor is realized. The increase in magnetic load can reduce the copper loss of the motor, thereby improving the efficiency of the motor. By arranging a layer of flow holes and a second layer of flow holes on the rotor core, the weight of the rotor is reduced and the area of ​​the flow holes is increased, which meets the large refrigerant flow after the motor is miniaturized under a large-displacement compressor. The reasonable arrangement of the positions of the first layer of flow holes and the second layer of flow holes can ensure the magnetic circuit requirements of the permanent magnet, the magnetic circuit is not saturated, the impact on the permanent magnet magnetic circuit is minimized, and the utilization rate of the permanent magnet can be improved. Furthermore, by designing the shape and size of the outer edge of the rotor core, the outer edge air gap of the rotor core is designed to be non-uniform, which minimizes the harmonic content of the air gap magnetic density, reduces iron loss and stray loss, and thus improves the efficiency of the motor.

[0043] According to a third aspect of the present invention, a compressor is provided, comprising the motor described in the above technical solution, and thus having all the beneficial effects of the motor, which will not be described in detail here.

[0044] According to a fourth aspect of the present invention, an air conditioner is provided, comprising the compressor according to any one of the above technical solutions, and thus having all the beneficial effects of the compressor, which will not be described in detail here.

[0045] According to a fifth aspect of the present invention, a vehicle is provided, comprising the motor described in any one of the above technical solutions or the compressor described in any one of the above technical solutions, thereby having all the beneficial effects of the motor or compressor, which will not be described in detail here.

[0046] Additional aspects and advantages of the invention will become apparent from the description which follows, or may be learned by practice of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments with reference to the following drawings, in which:

[0048] Figure 1 This is a schematic diagram of the structure of a 12-slot, 8-pole rotor with a straight-line permanent magnet in the prior art;

[0049] Figure 2 This is a schematic diagram of the structure of a 12-slot 8-pole rotor with a V-shaped permanent magnet in the prior art;

[0050] Figure 3 This is a schematic diagram of the structure of a 12-slot, 8-pole rotor of a tile-type surface-mounted rotor in the prior art;

[0051] Figure 4 1. A schematic diagram of a motor rotor structure in which the slot-pole combination is 12 slots and 8 poles according to an embodiment of the present invention;

[0052] Figure 5 1. This is a schematic diagram of the stator structure of a motor with 12 slots and 8 poles in accordance with an embodiment of the present invention;

[0053] Figure 6 It is a schematic structural diagram of a permanent magnet according to an embodiment of the present invention;

[0054] Figure 7 1 is a schematic structural diagram of a permanent magnet according to another embodiment of the present invention;

[0055] Figure 8 1 is a schematic structural diagram of a permanent magnet according to another embodiment of the present invention;

[0056] Figure 9 An embodiment of the present invention Figure 4 The rotor shown is paired Figure 5 Stator of the motor and the existing example Figure 1 Matching Figure 5 Comparison of the stator's no-load back EMF waveform;

[0057] Figure 10 An embodiment of the present invention Figure 4 The rotor shown is paired Figure 5 Stator of the motor and the existing example Figure 3 Matching Figure 5 Comparison of motor cogging torque waveforms at the stator.

[0058] in, Figures 4 to 8 The corresponding relationship between the reference numerals and component names is as follows:

[0059] 1 rotor, 102 rotor core, 104 center hole, 106 rivet hole, 108 magnet slot, 110 permanent magnet, 112 first layer flow hole, 114 second layer flow hole, 116 limiting protrusion, 2 stator, 202 stator core, 204 stator teeth, 206 winding slot, 208 stator winding, 210 rotor hole. DETAILED DESCRIPTION

[0060] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0061] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0062] Refer to the following Figures 4 to 10 The rotor 1 , the motor and the compressor, the air conditioner, and the vehicle according to some embodiments of the present invention are described.

[0063] According to one embodiment of the present invention, a rotor 1 is provided, comprising: a rotor core 102, wherein the rotor core 102 is provided with a plurality of magnet slots 108, and the magnet slots 108 are located on the circumferential side of the rotor core 102; and permanent magnets 110, wherein the permanent magnets 110 are disposed in the magnet slots 108, and the cross-sectional contour line of the permanent magnets 110 on the side opposite to the magnet slots 108 includes at least one straight line.

[0064] like Figure 4 As shown, the rotor 1 provided by the present invention includes a rotor core 102 and permanent magnets 110. A plurality of magnet slots 108 are provided on the circumferential side of the rotor core 102. The permanent magnets 110 are provided in the magnet slots 108. The cross-sectional contour line of the permanent magnets 110 on the side opposite to the magnet slots 108 includes at least one straight line. The rotor provided by the present invention, by providing magnet slots 108 on the circumferential side of the rotor core for arranging the permanent magnets 110, on the one hand, allows the permanent magnets 110 to be arranged on the circumferential side of the rotor core, thereby increasing the usable space of the cross section of the rotor core; on the other hand, by arranging the permanent magnets 110 in the magnet slots 108, the permanent magnets 110 are more closely fitted to the rotor core after installation, and the rotor has high mechanical strength, meeting the requirements of high-speed operation. Furthermore, the contour line of the permanent magnet 110 on the side away from the rotor core includes at least one straight line, so that the thickness of the permanent magnet 110 is uneven, thereby reducing the torque pulsation of the motor, reducing the harmonic content of the air gap magnetic density, reducing the iron loss and stray loss of the motor, improving the motor efficiency, and improving the motor noise.

[0065] The rotor 1 provided by the present invention is different from the conventional Figure 1 Compared with the "I"-shaped permanent magnets arranged in the middle rotor, the amount of permanent magnets 110 is increased to the maximum extent, copper loss is reduced, thereby improving motor efficiency and realizing motor miniaturization; the rotor 1 provided by the present invention is different from the existing Figure 2 Compared with the "V" shaped arrangement of permanent magnets in the middle rotor, the cross section of the rotor core has a larger space, which can be used to design the rotor flow hole. The rotor 1 has a large flow area, which can meet the large refrigerant flow after the motor under the large displacement compressor is miniaturized; the rotor 1 provided by the present invention is different from the existing Figure 3Compared with the medium tile type surface mounted rotor structure, the permanent magnet 110 fits more tightly with the rotor core 102 after installation, the rotor 1 has high mechanical strength and meets the requirements of high-speed operation, and the thickness of the permanent magnet 110 of the rotor 1 is not uniform, which makes the torque pulsation of the motor small, the harmonic content of the air gap magnetic density is reduced, the iron loss and stray loss of the motor are reduced, the motor efficiency is improved, the motor torque pulsation is small, and the motor noise is improved.

[0066] In one embodiment of the present invention, preferably, at least one straight line is parallel to a cross-sectional contour line of the permanent magnet 110 located inside the magnet slot 108 .

[0067] In this embodiment, by setting at least one straight line parallel to the contour line on the side of the magnet slot 108, so that at least one straight line is located in the middle position of the outer contour line of the permanent magnet 110, on the one hand, a better effect of small torque pulsation can be achieved; on the other hand, during the assembly process, assembly is facilitated to meet the manufacturing requirements of the rotor.

[0068] In one embodiment of the present invention, preferably, the length of at least one straight line is L1, the width of the permanent magnet 110 located in the magnet slot 108 is L2, and the ratio of L1 to L2 is greater than or equal to 0.05 and less than or equal to 0.7.

[0069] In this embodiment, the ratio between the straight segment and the width of the permanent magnet 110 is reasonably set to adjust the torque pulsation of the rotor 1 to achieve an optimal state, thereby reducing the motor iron loss and stray loss, improving the motor efficiency, and improving the motor noise.

[0070] In one embodiment of the present invention, preferably, the side of the permanent magnet 110 facing the magnet slot 108 is a plane, the side opposite to the plane is a convex surface, and both side surfaces of the permanent magnet 110 are planes; wherein the contour line corresponding to the convex surface includes at least one straight line.

[0071] In this embodiment, the permanent magnet 110 has a convex structure. The cross-sectional profile of the permanent magnet 110 includes two oppositely arranged groups of straight segments and two arcs. One end of one of the two groups of straight segments is connected to the two ends of one of the other groups of straight segments, and the two ends of another of the other groups of straight segments are connected to one end of the two arcs. The other ends of the two arcs are connected to the other ends of the group of straight segments. Specifically, the profile corresponding to the convex surface includes two arcs and one straight segment. By setting the thickness of the permanent magnet 110 to be non-uniform, the torque pulsation of the motor is reduced, the harmonic content of the air gap magnetic flux density is reduced, the iron loss and stray loss of the motor are reduced, the motor efficiency is improved, the motor torque pulsation is reduced, and the motor noise is improved.

[0072] In one embodiment of the present invention, preferably, the permanent magnet 110 is partially disposed in the magnet slot 108 , and a side of the permanent magnet 110 away from the magnet slot 108 protrudes from the circumferential surface of the rotor core 102 .

[0073] In this embodiment, magnet slots 108 are provided on the circumferential side of the rotor core 102 for arranging permanent magnets 110, thereby increasing the amount of permanent magnets 110 used and increasing the usable space of the cross section of the rotor core 102; by arranging the permanent magnets 110 in the magnet slots 108 and protruding the permanent magnets 110 from the circumferential outer surface of the rotor core 102, the permanent magnets 110 fit more closely with the rotor core 102 after installation, and the rotor 1 has high mechanical strength, meeting the requirements of high-speed operation.

[0074] In a specific embodiment, Figures 6 to 8 As shown, the permanent magnet 110 can have various structures, such as Figure 6 As shown, the magnet slot 108 is a rectangular slot, the portion where the permanent magnet 110 is connected to the magnet slot 108 matches the rectangular slot, and the side of the permanent magnet 110 away from the magnet slot 108 is a contour line with both ends having an arc structure. Figure 7 As shown, the cross-section of the permanent magnet 110 is a pentagonal structure, wherein two adjacent sides of the permanent magnet 110 are disposed in the magnet slot 108, and the corresponding magnet slot 108 is a groove structure with two side surfaces, and the remaining three sides of the permanent magnet 110 protrude from the outer surface of the rotor core 102. Figure 8 As shown, the cross-sectional shape of the permanent magnet 110 is a notched circle consisting of an arc and a straight line connected to the arc, wherein the arc portion is arranged in the magnet slot 108, and the straight line portion is located on the opposite side of the magnet slot 108. The magnet slot 108 structure is an arc-shaped groove structure.

[0075] In one embodiment of the present invention, preferably, Figure 4 As shown, the rotor 1 further includes: a limiting protrusion 116, which is provided on the rotor core 102 and is located between two magnet slots 108 of adjacent magnetic poles.

[0076] In this embodiment, by providing a limiting protrusion 116 between two adjacent magnet slots 108 on the rotor core 102, it is facilitated to install the permanent magnet 110 into the magnet slot 108, and the limiting protrusion 116 contacts the permanent magnet 110, thereby increasing the connection area of ​​the permanent magnet 110, further ensuring the mechanical strength of the permanent magnet 110 after installation, thereby meeting the requirement of high-speed operation of the rotor.

[0077] In one embodiment of the present invention, preferably, the distance from the protruding end of the limiting protrusion 116 to the geometric center of the rotor core 102 is L3; the distance from the tangent of any point on the side of the limiting protrusion 116 in the cross-sectional contour line of the permanent magnet 110 on the side opposite to the magnet slot 108 to the geometric center of the rotor core 102 is L4, and L3 and L4 satisfy: 0.5mm≤L4-L3≤3mm.

[0078] In this embodiment, the distance from the protruding end of the limiting protrusion 116 located on the circumferential side of the rotor core 102 to the geometric center of the rotor core 102 is L3, and the distance from the tangent of the contour line of the permanent magnet away from the magnet slot 108 on any point on one end of the limiting protrusion 116 close to the geometric center is L4. By reasonably setting the dimensional parameters of the limiting protrusion 116 and the permanent magnet 110 so as to satisfy 0.5mm≤L4-L3≤3mm, the magnetic resistance of the q-axis magnetic circuit can be increased, the q-axis inductance Lq can be reduced, the inter-pole leakage magnetic flux can be reduced, and the operating efficiency of the motor can be improved.

[0079] In a specific embodiment, Figure 4 As shown, L4 may be the distance from the outer point of the permanent magnet 110 between the poles of the permanent magnet 110 to the center of the rotor 1 .

[0080] In a specific embodiment, Figure 4 As shown, the outer surface of the permanent magnet 1110 is composed of three straight lines: L1 = 6.1 mm; L2 = 20 mm, then L1 / L2 = 0.31, which minimizes the harmonic content of the air gap magnetic density, reduces iron loss and stray loss, reduces torque pulsation, and improves motor efficiency; the limiting protrusion 116 of the permanent magnet 110 is conducive to the installation of the permanent magnet 110, L3 = 29 mm, L4 = 30 mm, then L4-L3 = 1 mm, which makes the q-axis magnetic circuit magnetic resistance large, reduces the q-axis inductance Lq, and reduces the inter-pole leakage magnetic flux.

[0081] In one embodiment of the present invention, preferably, Figure 4 As shown, the rotor 1 further includes: a center hole 104 , which is provided on the rotor core 102 and is used to pass the shaft of the motor; a rivet hole 106 , which is provided on the rotor core 102 ; and a flow hole, which is provided on the rotor core 102 .

[0082] In this embodiment, the rotor core 102 of the rotor 1 is provided with a center hole 104, rivet holes 106, and flow holes, wherein the center hole 104 is used to pass the motor shaft, the rivet holes 106 are used to connect rivets, and the flow holes are used to circulate the refrigerant. The rotor 1 provided by the present invention, by arranging the permanent magnets 110 on the circumference of the rotor core 102, thereby providing a larger available area on the rotor core 102, thereby increasing the number of flow holes provided, thereby increasing the flow area of ​​the rotor 1, and achieving a large refrigerant flow after miniaturization of the motor under a large displacement compressor.

[0083] In one embodiment of the present invention, preferably, Figure 4 As shown, the through-holes include a first layer of through-holes 112 and a second layer of through-holes 114; the first layer of through-holes 112 is located between adjacent rivet holes 106, and the number of the first layer of through-holes 112 is multiple; the second layer of through-holes 114 is located on the side of the rotor core 102 close to the center hole 104, and the number of the second layer of through-holes 114 is multiple.

[0084] In this embodiment, two layers of flow holes are provided between the outer edge of the rotor core 102 and the rotor shaft hole. A first layer of flow holes 112 is provided between adjacent rivet holes 106, and a second layer of flow holes 114 is provided near the rotor center hole 104. Multiple first and second layers of flow holes 112 and 114 are provided. Providing two layers of flow holes reduces the weight of the rotor 1 and increases the flow hole area, meeting the requirements for large refrigerant flow in a compact motor for large-displacement compressors.

[0085] In one embodiment of the present invention, preferably, Figure 4 As shown, the rivet hole 106 is located between adjacent magnet slots 108 , and the minimum distance L5 between the rivet hole 106 and the permanent magnet 110 and the minimum distance L6 between the rivet hole 106 and the second-layer flow hole 114 satisfy: 1.2≤L5 / L6≤3.

[0086] In this embodiment, rivet holes 106 are located between adjacent magnetic poles. The minimum distance between rivet holes 106 and permanent magnets 110 is L5, and the minimum distance between rivet holes 106 and second-layer flow holes 114 is L6, satisfying the following relationship: 1.2 ≤ L5 / L6 ≤ 3. This arrangement ensures the magnetic circuit requirements of permanent magnets 110, prevents magnetic circuit saturation, minimizes impact on the magnetic circuit of permanent magnets 110, and improves the utilization rate of permanent magnets 110.

[0087] In this specific embodiment, L5=5.1mm; L6=2.8mm, then L5 / L6=1.8, which ensures the magnetic circuit requirements of the permanent magnet 110. The magnetic density between the rivet hole 106 and the permanent magnet 110 is 1.2T, the magnetic circuit is not saturated, and the impact on the magnetic circuit of the permanent magnet 110 is minimal, thereby improving the utilization rate of the permanent magnet 110.

[0088] In one embodiment of the present invention, preferably, Figure 4 As shown, the first layer of through-holes 112 is located on the line connecting the geometric center of the permanent magnet 110 and the geometric center of the center hole 104 ; the second layer of through-holes 114 is located on the line connecting the geometric center of the rivet hole 106 to the geometric center of the center hole 104 .

[0089] In this embodiment, a layer of through-holes 112 is arranged on the axis of a line connecting the center of the permanent magnet 110 to the rotor center hole 104, which can reduce the q-axis inductance. At the same time, the area of ​​the first layer of through-holes 112 is large. The second layer of through-holes 114 is arranged on the axis of a line connecting the center of the rivet hole 106 to the rotor center hole 104, and is staggered with the first layer of through-holes 112. On the basis of increasing the flow area, the mechanical strength of the rotor core 102 is further ensured.

[0090] In one embodiment of the present invention, preferably, electromagnetic steel plates are stacked to form the rotor core 102; and the thickness of a single electromagnetic steel plate is less than or equal to 0.5 mm.

[0091] In this embodiment, the rotor core 102 is formed by stacking a plurality of electromagnetic steel plates to increase axial electrical insulation and reduce eddy current losses. The rotor core 102 obtained by stacking the electromagnetic steel plates in sheets reduces the path for eddy current flow and thus effectively reduces eddy current losses. Furthermore, the thickness of the electromagnetic steel plates of the stacked rotor core 102 is less than or equal to 0.5 mm, so that the eddy current loss of the rotor core is small, thereby improving the operating efficiency of the motor.

[0092] In one embodiment of the present invention, preferably, the permanent magnet 110 is glued into the magnet slot 108 by glue, and the adhesive force of the glue is greater than or equal to 27.6 MPa; the permanent magnet 110 is a rare earth neodymium iron boron magnet.

[0093] In this embodiment, the permanent magnet 110 is glued to the permanent magnet slot 108 with an adhesive having an adhesive force greater than 27.6 MPa to ensure the mechanical strength of the rotor 1 when running at high speed; the rare earth neodymium iron boron magnet has high magnetic properties, ensuring the operating stability and efficiency of the motor.

[0094] In one embodiment of the present invention, preferably, Figure 4 As shown, the contact surface between the permanent magnet 110 and the magnet slot 108 is rectangular.

[0095] In this embodiment, a rectangle is used as the contact surface between the permanent magnet 110 and the magnet slot 108, which can increase the contact area between the permanent magnet 110 and the magnet slot 108. Compared with the contact surface being an arc, the processing accuracy of the rectangular surface is higher than that of the arc surface, so that the permanent magnet 110 is in close contact with the rotor core 102 and the glue is evenly applied, making it easier to install the permanent magnet 110. After installation, the permanent magnet 110 has higher mechanical strength and can meet the requirements of high-speed operation.

[0096] In one embodiment of the present invention, preferably, Figure 4 As shown, the permanent magnets 110 , the rivet holes 106 , and the flow holes are all arranged in a centrosymmetrical manner around the geometric center of the rotor core 102 .

[0097] In this embodiment, the permanent magnets 110, rivet holes 106, and flow holes are all arranged in a centrally symmetrical manner around the geometric center of the rotor core 102, so that the weight of the rotor 1 is evenly distributed and vibration and noise are not easily generated during high-speed operation.

[0098] like Figure 5 As shown, according to a second aspect of the present invention, a motor is provided, which includes: a stator 2, the stator 2 including a rotor hole 210; and a rotor 1 as described in any of the above technical solutions, the rotor 1 is arranged in the rotor hole 210.

[0099] According to the motor provided by the present invention, the amount of permanent magnet 110 is maximized, the purpose of increasing the magnetic load is achieved, and the high power density of the motor is realized. The increase in magnetic load can reduce the copper loss of the motor, thereby improving the efficiency of the motor. By arranging a layer of flow holes 112 and a second layer of flow holes 114 on the rotor core 102, the weight of the rotor is reduced and the flow hole area is increased, which meets the large refrigerant flow after the motor is miniaturized under a large-displacement compressor. The reasonable arrangement of the positions of the first layer of flow holes 112 and the second layer of flow holes 114 can ensure the magnetic circuit requirements of the permanent magnet 110, the magnetic circuit is not saturated, the impact on the magnetic circuit of the permanent magnet 110 is minimized, and the utilization rate of the permanent magnet 110 can be improved. Furthermore, by designing the shape and size of the outer edge of the permanent magnet 110, the outer edge air gap of the rotor 1 is designed to be non-uniform, which minimizes the harmonic content of the air gap magnetic density, reduces iron loss and stray loss, and thus improves the efficiency of the motor.

[0100] In a specific embodiment, Figures 4 to 10 As shown, the motor includes a stator 2 and a rotor 1. The stator core 202 of the stator 2 is formed by laminating electromagnetic steel plates. The rotor core 102 of the rotor 1 is also formed by laminating electromagnetic steel plates. The thickness of the electromagnetic steel plates of the laminated stator core 202 and the rotor core 102 is less than or equal to 0.5 mm. Preferably, the thickness of the electromagnetic steel plates in this embodiment is 0.3 mm. Specifically, Figure 4 The slot-pole combination of the rotor 1 provided in this embodiment is 12 slots and 8 poles, and the stator 2 connected thereto is as shown in FIG. Figure 5 shown.

[0101] like Figure 5 As shown, the stator 2 includes a stator core 202, a rotor hole 210 for the rotor 1 to pass through, a plurality of winding slots 206 arranged around the rotor hole 210, and stator windings 208 installed in the winding slots 206. The plurality of winding slots 206 are arranged in a centrally symmetrical manner around the rotor hole 210. The stator windings 208 of the motor are wound around the stator teeth 204 to form the three-phase winding coils of the motor A, B, and C.

[0102] like Figure 4As shown, the rotor 1 includes a rotor core 102, a center hole 104 for the shaft to pass through, a rivet hole 106 for connecting rivets, a plurality of magnet slots 108 arranged around the center hole 104, permanent magnets 110 installed in the magnet slots 108, and a first layer of through-holes 112 and a second layer of through-holes 114 for circulating the refrigerant. The permanent magnets 110, rivet holes 106, the first layer of through-holes 112, and the second layer of through-holes 114 are arranged in a centrally symmetrical manner around the center hole 104. The permanent magnets 110 are rare earth neodymium iron boron magnets and are arranged on the outer surface of the rotor core 102. The contact surface between the permanent magnets 110 and the magnet slots 108 on the rotor core 102 is a rectangular groove. The permanent magnets 110 are adhered to the magnet slots 108 using an adhesive with an adhesive force greater than 27.6 MPa to ensure the mechanical strength of the rotor 1 when running at high speeds. A layer of rivet holes 106, a layer of through-holes 112, and a second layer of through-holes 114 are provided between the outer edge of the rotor core and the center hole 104. A layer of through-holes 112 is provided between adjacent rivet holes 106 near the outer edge of the rotor core 102, and a second layer of through-holes 114 is provided near the rotor center hole 104. The rivet holes 106 of rotor 1 are distributed between two magnet slots 108 of adjacent magnetic poles.

[0103] like Figure 4 As shown, the outer surface of the permanent magnet 110 is composed of at least one straight line, at least one straight line with a length of L1 is parallel to a straight line with a width of L2 of the permanent magnet 110 installed inside the magnet slot 108 of the permanent magnet 110, and satisfies: 0.05≤L1 / L2≤0.7; a limiting protrusion 116 of the permanent magnet 110 is provided between the permanent magnets 110 of adjacent poles, and the distance from the limiting protrusion 116 to the center of the rotor is L3, and the distance from the outer point of the permanent magnet 110 between the poles of the permanent magnet 110 to the center of the rotor is L4, and satisfies: 0.5mm≤L4-L3≤3mm. In a specific embodiment, as Figure 4 As shown, the outer surface of the permanent magnet 110 is composed of three straight lines, L1 = 6.1 mm, L2 = 20 mm, then L1 / L2 = 0.31, which minimizes the harmonic content of the air gap magnetic density, reduces iron loss and stray loss, reduces torque pulsation, and improves motor efficiency; the limiting protrusion 116 of the permanent magnet 110 is conducive to the installation of the permanent magnet 110, wherein L3 = 29 mm, L4 = 30 mm, then L4-L3 = 1 mm, which makes the q-axis magnetic circuit magnetic resistance large, reduces the q-axis inductance Lq, and reduces the inter-pole leakage magnetic flux.

[0104] like Figure 4As shown, rivet holes 106 are located between adjacent magnetic poles. The minimum distance between rivet holes 106 and permanent magnet 110 is L5, and the distance between rivet holes 106 and the inner two-layer flow holes 114 is L6, satisfying the following relationship: 1.2≤L5 / L6≤3. The outer layer of flow holes 112 is located on the axis connecting the center of permanent magnet 110 to the center hole 104 of rotor 1, which can reduce the q-axis inductance while increasing the flow hole area. The inner two-layer flow holes 114 are located on the axis connecting the center of rivet hole 106 to the rotor center hole 104. In a specific embodiment, L5 = 5.1 mm and L6 = 2.8 mm, so L5 / L6 = 1.8, ensuring the permanent magnet magnetic circuit requirements. The magnetic flux density between rivet hole 106 and permanent magnet 110 is 1.2 T, the magnetic circuit is not saturated, and the impact on the magnetic circuit of permanent magnet 110 is minimized, thereby improving the utilization rate of permanent magnet 110.

[0105] Now compare the existing examples Figure 1 The “I”-shaped rotor structure shown is used to illustrate the effect of the present invention on improving motor efficiency. Figure 1 In the rotor structure shown, the maximum amount of permanent magnets per pole is determined by the range limited by the rotor outer diameter and the individual pole pitch angle. The individual pole pitch angle is determined by the number of motor poles. After the rotor outer diameter and the number of motor poles are determined, the rotor outer diameter D1 = 60 mm, the number of motor poles p = 4, and the thickness hm of the permanent magnet in the magnetization direction must meet the anti-demagnetization requirement. Setting hm to 2.3 mm also determines the maximum amount of permanent magnets per pole, and the permanent magnet width is 19.1 mm. Compared to the rotor structure of the present invention, the width of the permanent magnet per pole of the present invention is 20 mm, a 5% increase in magnet width. Figure 9 An embodiment of the present invention Figure 4 The rotor shown is paired Figure 5 Stator of the motor and the existing example Figure 1 Matching Figure 5 Comparison of the stator's no-load back EMF waveforms: The back EMF coefficient of the present invention is 10.6% higher than that of the existing straight-line model. This significant improvement in back EMF increases motor torque and power density at the same current, enabling motor miniaturization. At a high speed of 11,000 rpm, copper losses are reduced by 47.9 W, iron losses are reduced by 22.7 W, and eddy current losses in the magnets are increased by 20 W. The relative motor efficiency (i.e., the difference between the two efficiencies) is increased by 0.76%.

[0106] Now compare the existing examples Figure 2 The “V”-shaped rotor structure shown is used to illustrate the effects of the present invention on increasing motor current flow and reducing rotor weight. Figure 2In the rotor structure shown, the permanent magnets under a single pole are arranged in a "V" shape. The area from the V-shaped magnet slot to the outer rotor surface requires sufficient silicon steel to meet magnetic circuit requirements, making it impossible to provide flow holes. Instead, a layer of flow holes is designed between the V-shaped magnet slot and the rotor shaft hole. Compared to the rotor structure of the present invention, the present invention can design two layers of flow holes, increasing the flow hole area by 2.18 times, meeting the large refrigerant flow requirements of large-displacement compressors after motor miniaturization. The rotor weight of the present invention is reduced by 18.5%.

[0107] Now compare the existing examples Figure 3 The surface-mounted tile-type rotor structure shown is used to illustrate the effect of the present invention on improving motor efficiency and reducing cogging torque pulsation. The tile-type magnet contacts the rotor surface in an arc segment. Since the arc segment magnet processing accuracy is worse than the straight segment, and the high-impact rotor outer cylindricality is not high, the magnet is not in close contact with the rotor core, and the arc segment glue coating is uneven, which makes it difficult to install the permanent magnet. After the permanent magnet is installed, the mechanical strength is low and cannot meet the high-speed operation requirements; the uniform thickness design of the permanent magnet leads to large torque pulsation of the motor, high air gap magnetic density harmonic content, large motor iron loss and stray loss, and reduced motor efficiency. Compared with the rotor structure of the present invention, the motor iron loss of the present invention is reduced by 8%, and the relative value of the motor efficiency (i.e., the subtraction value of the two efficiencies) is increased by 0.42%. Figure 10 An embodiment of the present invention Figure 4 The rotor shown is paired Figure 5 Stator of the motor and the existing example Figure 3 Matching Figure 5 Comparing the cogging torque waveforms of the stators, the cogging torque pulsation of the present invention is reduced by 48%, thereby improving the motor noise.

[0108] According to a third aspect of the present invention, a compressor is provided, comprising the motor described in the above embodiment, and thus having all the beneficial effects of the motor, which will not be described in detail here.

[0109] According to an embodiment of a fourth aspect of the present invention, an air conditioner is provided, comprising the compressor described in any one of the above embodiments, and thus having all the beneficial effects of the compressor, which will not be described in detail here.

[0110] According to an embodiment of the fifth aspect of the present invention, a vehicle is provided, comprising the motor described in any one of the above embodiments or the compressor described in any one of the above embodiments, thereby having all the beneficial effects of the motor or compressor, which will not be described in detail here.

[0111] In the present invention, the term "plurality" refers to two or more, unless otherwise specified. Terms such as "installed," "connected," "connected," and "fixed" should be interpreted broadly. For example, "connected" can mean fixed, removable, or integral; and "connected" can mean directly or indirectly through an intermediary. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0112] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0113] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A rotor for a motor, characterized in that: The rotor comprises: A rotor core, wherein a plurality of magnet slots are provided on the rotor core, and the magnet slots are located on the circumference of the rotor core; a permanent magnet, the permanent magnet being disposed in the magnet slot, the cross-sectional profile of the permanent magnet on a side opposite to the magnet slot including at least one straight line, and the thickness of the permanent magnet being uneven; The permanent magnet is partially disposed in the magnet slot, and a side of the permanent magnet away from the magnet slot protrudes from the circumferential surface of the rotor core; The length of the at least one straight line is L1, the width of the permanent magnet in the magnet slot is L2, and the ratio of L1 to L2 is greater than or equal to 0.05 and less than or equal to 0.7; The rotor further comprises: A limiting protrusion is provided on the rotor core and is located between two magnet slots of adjacent magnetic poles, wherein the limiting protrusion contacts the permanent magnet; The distance between the protruding end of the limiting protrusion and the geometric center of the rotor core is L3; The distance from the tangent of any point on the side of the limiting protrusion in the cross-sectional contour line of the permanent magnet on the side opposite to the magnet slot to the geometric center of the rotor core is L4, and the difference between L4 and L3 is greater than or equal to 0.5 mm and less than or equal to 3 mm.

2. The rotor according to claim 1, characterized in that The at least one straight line is parallel to the cross-sectional contour line of the permanent magnet located inside the magnet slot.

3. The rotor according to claim 2, characterized in that The side of the permanent magnet facing the magnet slot is a plane, the side opposite to the plane is a convex surface, and both side surfaces of the permanent magnet are planes; The contour line corresponding to the convex surface includes the at least one straight line.

4. The rotor according to claim 1, characterized in that Also includes: A center hole is provided on the rotor core, and the center hole is used to pass the shaft of the motor; Rivet holes are provided on the rotor core; The through hole is arranged on the rotor core.

5. The rotor according to claim 4, characterized in that The through-flow holes include a first layer of through-flow holes and a second layer of through-flow holes; The layer of through-holes is located between adjacent rivet holes, and the number of the through-holes in the layer is multiple; The second-layer flow holes are located on a side of the rotor core close to the center hole, and there are multiple second-layer flow holes.

6. The rotor according to claim 5, characterized in that The rivet hole is located between adjacent magnetic poles, and a ratio of a minimum distance L5 from the rivet hole to the permanent magnet to a minimum distance L6 from the rivet hole to the second-layer flow hole is greater than or equal to 1.2 and less than or equal to 3.

7. The rotor according to claim 5, characterized in that The layer of through-holes is located on the line connecting the geometric center of the permanent magnet and the geometric center of the center hole; The second-layer flow holes are located on a line connecting the geometric center of the rivet hole to the geometric center of the center hole.

8. The rotor according to any one of claims 1 to 7, characterized in that Also includes: Electromagnetic steel plates, the electromagnetic steel plates being stacked to form the rotor core; The thickness of a single electromagnetic steel plate is less than or equal to 0.5 mm.

9. The rotor according to any one of claims 1 to 7, characterized in that The permanent magnet is glued to the magnet slot by glue, and the adhesive force of the glue is greater than or equal to 27.6 MPa; The permanent magnet is a rare earth neodymium iron boron magnet.

10. The rotor according to any one of claims 1 to 7, characterized in that The contact surface between the permanent magnet and the magnet slot is rectangular.

11. The rotor according to any one of claims 4 to 7, characterized in that The permanent magnets, the rivet holes, and the flow holes are all arranged in a centrosymmetrical manner around the geometric center of the rotor core.

12. A motor, characterized in that: include: a stator, the stator including a rotor bore; and The rotor according to any one of claims 1 to 11, wherein the rotor is arranged in the rotor hole.

13. A compressor, characterized in that: Comprising the motor as claimed in claim 12.

14. An air conditioner, characterized in that: Comprising the compressor of claim 13.

15. A vehicle, characterized in that: Comprising the motor according to claim 12; or the compressor according to claim 13.

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