Rotor structure and motor with same

Abstract

The invention provides a rotor structure and a motor with the same, the rotor structure comprises a rotor core and magnets, at least two magnetic steel groove structures are arranged on the rotor core at intervals, the rotor core is divided into a plurality of magnetic conduction channels by the at least two magnetic steel groove structures, and the magnets are installed in the magnetic steel groove structures; at least two metal strips, one of the at least two metal strips is arranged in one magnetic conduction channel in a penetrating manner, the other of the at least two metal strips is arranged in the other magnetic conduction channel in a penetrating manner, and the two ends of each metal strip respectively extend out of the two ends of the rotor iron core; the first metal piece and the second metal piece are arranged at the two ends of the rotor iron core respectively, and the two ends of each metal strip are connected with the first metal piece and the second metal piece respectively. Through the technical scheme provided by the invention, the technical problem that a motor in the prior art is easy to demagnetize can be solved.

Description

Technical Field

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

[0002] At present, the variable frequency permanent magnet synchronous motor in the existing technology uses permanent magnets to generate a magnetic field inside the motor, and inputs currents of different frequencies through an external frequency converter. The current in the stator generates a rotating magnetic field, so that the rotor core and the stator magnetic field rotate synchronously, thereby realizing the operation of the motor. Permanent magnet synchronous motors have the advantages of high power density, high torque density, and high efficiency. Therefore, they are widely used to replace low-efficiency induction motors in industries, new energy and other fields. Anti-demagnetization ability is a key reliability indicator of permanent magnet synchronous motors. During the constant power operation stage of permanent magnet motors, weak magnetic control and MTPV control strategies (representing the maximum torque generated under unit voltage) are used to increase the speed and maintain high power, introducing a higher proportion of direct-axis current. At this time, the external reverse magnetic field generated by the stator is stronger.

[0003] However, during the current modulation process, abnormal or extreme operating conditions such as permanent magnet motor overload output, motor loss of step, stator three-phase short circuit, etc. occur, and current imbalance or response changes cause the reverse magnetic field to increase instantly, which will lead to uniform or regional non-uniform demagnetization of the permanent magnet. Especially for permanent magnet synchronous motors using ferrite, the magnetic steel has low coercive force and is more prone to demagnetization, which directly affects the efficiency and reliability of permanent magnet synchronous motors. Summary of the invention

[0004] The main purpose of the present invention is to provide a rotor structure and a motor having the same, so as to solve the technical problem that the motor in the prior art is prone to demagnetization.

[0005] In order to achieve the above object, according to one aspect of the present invention, a rotor structure is provided, comprising:

[0006] A rotor core and a magnet, wherein at least two magnetic steel slot structures are arranged on the rotor core at intervals, and the at least two magnetic steel slot structures divide the rotor core into a plurality of magnetic conductive channels, and a magnet is installed in each magnetic steel slot structure;

[0007] At least two metal strips, one of the at least two metal strips is inserted into one magnetic conductive channel, the other of the at least two metal strips is inserted into another magnetic conductive channel, and two ends of each metal strip are respectively extended out of two ends of the rotor core;

[0008] The first metal member and the second metal member are respectively arranged at two ends of the rotor core, and two ends of each metal strip are respectively connected to the first metal member and the second metal member.

[0009] Further, the plurality of magnetic conductive channels include a first magnetic conductive channel, the first magnetic conductive channel is formed between two adjacent magnetic steel slot structures, and at least one metal strip is inserted in the first magnetic conductive channel; and / or,

[0010] The plurality of magnetic conductive channels include a second magnetic conductive channel, each magnetic steel slot structure includes at least two magnetic steel slots spaced apart in the radial direction of the rotor core, a second magnetic conductive channel is formed between two adjacent magnetic steel slots, and at least one metal strip is inserted in the second magnetic conductive channel; and / or,

[0011] The multiple magnetic conductive channels include a third magnetic conductive channel. One side of each magnetic steel slot structure located close to the outer edge of the rotor core and the outer edge of the rotor core form the third magnetic conductive channel. At least one metal strip is inserted in the third magnetic conductive channel.

[0012] Further, the plurality of magnetic conductive channels include a second magnetic conductive channel and a third magnetic conductive channel, each magnetic steel slot structure includes at least two magnetic steel slots spaced apart along the radial direction of the rotor core, a second magnetic conductive channel is formed between two adjacent magnetic steel slots, and the magnetic steel slots of each magnetic steel slot structure located near the outer edge of the rotor core and the rotor core form a third magnetic conductive channel;

[0013] Among them, at least one metal strip is inserted in the second magnetic channel, at least one metal strip is inserted in the third magnetic channel, and the at least one metal strip in the second magnetic channel and the at least one metal strip in the third magnetic channel are spaced apart along the radial direction of the rotor core.

[0014] Furthermore, at least two metal strips are inserted into the second magnetic conductive channel;

[0015] At least two metal strips in the second magnetic conductive channel are arranged at intervals along the extension direction of the second magnetic conductive channel; or,

[0016] At least one metal strip in the second magnetic conductive channel and at least one metal strip in the third magnetic conductive channel are arranged at intervals along the circumferential direction of the rotor core.

[0017] Further, at least two metal bars are inserted in the third magnetic conductive channel; the at least two metal bars in the third magnetic conductive channel and at least one metal bar in the second magnetic conductive channel are spaced apart in the radial direction of the rotor core; and / or,

[0018] At least two metal strips are inserted into the second magnetic conductive channel. The multiple magnetic conductive channels include a first magnetic conductive channel. The first magnetic conductive channel is formed between two adjacent magnetic steel slot structures. At least one metal strip is inserted into the first magnetic conductive channel. The at least one metal strip in the first magnetic conductive channel, the at least one metal strip in the second magnetic conductive channel, and the at least one metal strip in the third magnetic conductive channel are spaced apart along the circumferential direction of the rotor core.

[0019] Furthermore, the rotor structure has a plurality of rotor core poles, a magnetic steel slot structure is arranged between two adjacent rotor core poles, and the central angle corresponding to each rotor core pole is αp; the symmetry axis of the two adjacent rotor core poles is the Q axis, and the symmetry axis of each magnetic steel slot structure is the D axis; along the extension direction of the Q axis, the widths of the plurality of magnetic conductive channels in each rotor core pole are sequentially hq1 to hqn; along the direction of the D axis, the widths of the plurality of magnetic conductive channels from the inner circle of the rotor core to the outer circle of the rotor core are sequentially hd1 to hdn; along the extension direction of the D axis, the widths of the plurality of magnetic conductive channels from the inner circle of the rotor core to the outer circle of the rotor core are sequentially hd1 to hdn; The widths of the multiple metal strips between the inner circle of the core and the outer circle of the rotor core are h1 to hn in sequence, and the sum of the diameters of the multiple metal strips between the inner circle of the rotor core and the outer circle of the rotor core is ∑hn; the distance between the inner circle of the rotor core and the outer circle of the rotor core is R; the maximum width of the metal strips in the D-axis direction or the Q-axis direction is dmax; along the peripheral direction of the outer circle of the rotor core, the central angles corresponding to the multiple metal strips in each rotor core pole are αq1 to αqn in sequence, and the sum of the central angles corresponding to the multiple metal strips in each rotor core pole is ∑αn;

[0020] Where, ∑αn / αp≤0.2; and / or,

[0021] 0.15≤dmax / hqn≤0.3; and / or,

[0022] 0.15≤dmax / hdn≤≤0.3; and / or,

[0023] ∑hn≤0.2R.

[0024] Furthermore, the rotor structure has a plurality of rotor core poles, a magnetic steel slot structure is arranged between two adjacent rotor core poles, and the central angle corresponding to each rotor core pole is αp; the axis of symmetry of two adjacent rotor core poles is the Q axis, and the axis of symmetry of each magnetic steel slot structure is the D axis; a plurality of metal strips arranged at intervals along the D axis direction are arranged on one of the two adjacent magnetic steel slot structures, and a plurality of metal strips arranged at intervals along the Q axis direction are arranged on the other of the two adjacent magnetic steel slot structures.

[0025] Furthermore, the cross-sections of the metal strips are all circular, elliptical, or square; and / or,

[0026] At least two guide bar grooves are arranged on the rotor core, and the at least two guide bar grooves are arranged in one-to-one correspondence with the at least two metal bars, and the shape of each guide bar groove is adapted to the corresponding metal bar.

[0027] Further, one end of the metal strip is welded to the first metal member; and / or,

[0028] The other end of the metal strip is welded to the second metal member; and / or,

[0029] The first metal member and / or the second metal member is a plate-shaped structure.

[0030] Furthermore, the first metal part is attached to one end of the rotor core; and / or the second metal part is attached to the other end of the rotor core.

[0031] According to another aspect of the present invention, a motor is provided, comprising the rotor structure provided above.

[0032] By applying the technical solution of the present invention, when the stator magnetic field suddenly changes, at least two metal bars are connected to the first metal part and the second metal part to form a loop (which can be understood as a Lenz ring), and a protective magnetic field in the opposite direction to the stator demagnetization magnetic field is generated in the rotor core through the loop. The protective magnetic field counteracts the stator magnetic field and offsets a part of the stator demagnetization magnetic field, thereby effectively improving the anti-demagnetization ability, thereby enhancing the anti-demagnetization ability of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0034] Figure 1 An exploded view of a rotor structure provided according to an embodiment of the present invention is shown;

[0035] Figure 2 A schematic structural diagram of a rotor structure provided according to an embodiment of the present invention is shown;

[0036] Figure 3 A schematic structural diagram of a first metal member provided according to an embodiment of the present invention is shown;

[0037] Figure 4 A schematic diagram of the structure of the end surface portion of a rotor structure provided according to an embodiment of the present invention is shown;

[0038] Figure 5 A schematic diagram showing the dimensions of a portion of a rotor structure provided according to an embodiment of the present invention is shown;

[0039] Figure 6 Another partial dimension schematic diagram of a rotor structure provided according to an embodiment of the present invention is shown;

[0040] Figure 7 A magnetic field schematic diagram of a rotor structure provided according to an embodiment of the present invention is shown;

[0041] Figure 8 A schematic diagram showing a comparison of the anti-demagnetization effect of a rotor structure provided according to an embodiment of the present invention and a rotor structure in the prior art is shown;

[0042] Fig. 9 A schematic diagram comparing the safety factors of a rotor structure provided according to an embodiment of the present invention and a rotor structure in the prior art is shown.

[0043] The above drawings include the following reference numerals:

[0044] 10. rotor core; 11. magnetic steel slot structure; 12. magnetic channel; 121. first magnetic channel; 122. second magnetic channel; 123. third magnetic channel; 13. guide bar slot; 14. rotor core pole;

[0045] 20. Magnet;

[0046] 30. Metal strips;

[0047] 40. a first metal member; 41. a first mounting groove;

[0048] 50. Second metal component; 51. Second mounting groove. DETAILED DESCRIPTION

[0049] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0050] like Figures 1 to 7 As shown, an embodiment of the present invention provides a rotor structure, which includes a rotor core 10, a magnet 20, at least two metal strips 30, a first metal part 40 and a second metal part 50. At least two magnetic steel slot structures 11 are arranged at intervals on the rotor core 10. The at least two magnetic steel slot structures 11 divide the rotor core 10 into a plurality of magnetic conductive channels 12. A magnet 20 is installed in each magnetic steel slot structure 11. One of the at least two metal strips 30 is inserted into one magnetic conductive channel 12, and the other of the at least two metal strips 30 is inserted into another magnetic conductive channel 12. Both ends of each metal strip 30 extend out of both ends of the rotor core 10. The first metal part 40 and the second metal part 50 are respectively arranged at both ends of the rotor core 10, and both ends of each metal strip 30 are connected to the first metal part 40 and the second metal part 50 respectively.

[0051] With the rotor structure provided in this embodiment, when the stator magnetic field suddenly changes, at least two metal strips 30 are connected to the first metal member 40 and the second metal member 50 to form a loop (which can be understood as a Lenz ring, such as Figure 2), and through the loop, a protective magnetic field in the rotor core 10 is generated in the opposite direction to the stator demagnetization magnetic field, and the protective magnetic field counteracts the stator magnetic field, offsetting a part of the stator demagnetization magnetic field, thereby effectively improving the anti-demagnetization capability, so as to enhance the anti-demagnetization capability of the motor. Therefore, the technical solution provided by the embodiment of the present invention can solve the technical problem that the motor is prone to demagnetization in the prior art.

[0052] It should be noted that the motor here is mainly a permanent magnet motor, and the magnet 20 is a permanent magnet 20 .

[0053] In this embodiment, the plurality of magnetic channels 12 include a first magnetic channel 121, and the first magnetic channel 121 is formed between two adjacent magnetic steel slot structures 11, and at least one metal strip 30 is inserted into the first magnetic channel 121. With such a setting, it is convenient to flexibly and adaptively adjust the setting position of the metal strip 30.

[0054] The plurality of magnetic conductive channels 12 include a second magnetic conductive channel 122, each magnetic steel slot structure 11 includes at least two magnetic steel slots spaced apart in the radial direction of the rotor core 10, a second magnetic conductive channel 122 is formed between two adjacent magnetic steel slots, and at least one metal strip 30 is inserted in the second magnetic conductive channel 122. In this way, the setting position of the metal strip 30 can be flexibly adjusted so as to effectively achieve the anti-demagnetization effect.

[0055] The plurality of magnetic conductive channels 12 include a third magnetic conductive channel 123. One side of each magnetic steel slot structure 11 located near the outer edge of the rotor core 10 and the outer edge of the rotor core 10 form the third magnetic conductive channel 123. At least one metal strip 30 is inserted into the third magnetic conductive channel 123. In this way, the setting position of the metal strip 30 can be flexibly and adaptively adjusted, thereby effectively achieving the anti-demagnetization effect.

[0056] In this embodiment, the plurality of magnetic conductive channels 12 include a second magnetic conductive channel 122 and a third magnetic conductive channel 123, each magnetic steel slot structure 11 includes at least two magnetic steel slots spaced apart along the radial direction of the rotor core 10, a second magnetic conductive channel 122 is formed between two adjacent magnetic steel slots, and the magnetic steel slots of each magnetic steel slot structure 11 located near the outer edge of the rotor core 10 and the rotor core 10 form a third magnetic conductive channel 123. Among them, at least one metal strip 30 is inserted into the second magnetic conductive channel 122, and at least one metal strip 30 is inserted into the third magnetic conductive channel 123. The at least one metal strip 30 in the second magnetic conductive channel 122 and the at least one metal strip 30 in the third magnetic conductive channel 123 are spaced apart along the radial direction of the rotor core 10. With such a structural arrangement, it is convenient to optimize the structural layout of the metal strip 30, so as to effectively play the anti-demagnetization effect. By making each magnetic steel slot structure 11 include at least two magnetic steel slots spaced apart along the radial direction of the rotor core 10, it is convenient to form a magnetic resistance torque. In addition, such a configuration can facilitate the protection of the magnetic steels on both sides of the D-axis from demagnetization, and the D-axis corresponds to the symmetry axis of each magnetic steel slot structure 11 .

[0057] In this embodiment, at least two metal strips 30 are inserted into the second magnetic conductive channel 122 .

[0058] Specifically, at least two metal strips 30 in the second magnetic conductive channel 122 are arranged at intervals along the extension direction of the second magnetic conductive channel 122, so as to optimize the structural layout of the at least two metal strips 30 in the second magnetic conductive channel 122. Alternatively, at least one metal strip 30 in the second magnetic conductive channel 122 and at least one metal strip 30 in the third magnetic conductive channel 123 are arranged at intervals along the circumferential direction of the rotor core 10, so as to better optimize the structural layout of the two metal strips 30.

[0059] Preferably, the number of layers of the magnetic steel slots in this embodiment is greater than or equal to 2 layers, so as to form a magnetic resistance torque, and metal strips 30 are evenly distributed between the magnetic steel slots of the coal seam.

[0060] Specifically, when at least one metal bar 30 is arranged at intervals along the circumference of the rotor core 10 , the metal bar 30 can be arranged at the Q axis, so as to protect the magnetic steel on both sides of the Q axis from demagnetization. The Q axis corresponds to the symmetry axis of two adjacent rotor core poles 14 .

[0061] Specifically, at least two metal strips 30 are inserted into the third magnetic channel 123; at least two metal strips 30 in the third magnetic channel 123 and at least one metal strip 30 in the second magnetic channel 122 are radially spaced apart from each other in the rotor core 10, so as to optimize the structural layout of the metal strips 30 and better achieve the anti-demagnetization effect.

[0062] Specifically, at least two metal strips 30 are inserted in the second magnetic conductive channel 122, the plurality of magnetic conductive channels 12 include a first magnetic conductive channel 121, the first magnetic conductive channel 121 is formed between two adjacent magnetic steel slot structures 11, at least one metal strip 30 is inserted in the first magnetic conductive channel 121, at least one metal strip 30 in the first magnetic conductive channel 121, at least one metal strip 30 in the second magnetic conductive channel 122, and at least one metal strip 30 in the third magnetic conductive channel 123 are arranged at intervals along the circumference of the rotor core 10. With such a structural arrangement, it is possible to optimize the structural layout of the metal strips 30, improve the compactness of the structural layout of the metal strips 30, and better achieve the anti-demagnetization effect.

[0063] Specifically, the metal strips 30 in this embodiment can be alternately arranged along the D axis or the Q axis on each rotor core pole 14, that is, one layer of metal strips 30 is on the D axis and one layer of metal strips 30 is on the Q axis. This can release more magnetic circuit space and improve the motor's anti-saturation capability.

[0064] In this embodiment, the rotor structure has a plurality of rotor core poles 14, a magnetic steel slot structure 11 is arranged between two adjacent rotor core poles 14, and the central angle corresponding to each rotor core pole 14 is αp; the symmetry axis of the two adjacent rotor core poles 14 is the Q axis, and the symmetry axis of each magnetic steel slot structure 11 is the D axis; along the extension direction of the Q axis, the widths of the plurality of magnetic conductive channels 12 in each rotor core pole 14 are sequentially hq1 to hqn; along the direction of the D axis, the widths of the plurality of magnetic conductive channels 12 from the inner circle of the rotor core 10 to the outer circle of the rotor core 10 are sequentially hd1 to hdn; along the extension direction of the D axis, the widths of the plurality of magnetic conductive channels 12 from the inner circle of the rotor core 10 to the outer circle of the rotor core 10 are sequentially hd1 to hdn; 0 to the outer circle of the rotor core 10 are sequentially h1 to hn, and the sum of the diameters of the multiple metal strips 30 from the inner circle of the rotor core 10 to the outer circle of the rotor core 10 is ∑hn; the distance from the inner circle of the rotor core 10 to the outer circle of the rotor core 10 is R; the maximum width of the metal strip 30 in the D-axis direction or the Q-axis direction is dmax; along the circumferential direction of the outer circle of the rotor core 10, the central angles corresponding to the multiple metal strips 30 in each rotor core pole 14 are sequentially αq1 to αqn, and the sum of the central angles corresponding to the multiple metal strips 30 in each rotor core pole 14 is ∑αn;

[0065] Among them, ∑αn / αp≤0.2. When ∑αn is too large, too many guide bar slots 13 for matching with each metal bar 30 will be opened on the rotor core 10, so that the slots of the rotor core 10 account for a relatively large proportion, which leads to local saturation of the rotor core 10 on the Q axis, increased iron loss, and low motor efficiency. Specifically, αn can be understood as the pole arc corresponding to the metal bar 30.

[0066] 0.15≤dmax / hqn≤0.3. When the size of the metal strip 30 is too small, it is inconvenient to insert the metal strip 30 during the installation of the rotor core 10, resulting in low production efficiency. When the size of the metal strip 30 is too large, the hollowing ratio of the magnetic channel 12 of the rotor core 10 will be large, resulting in local magnetic circuit saturation, increased iron loss of the motor and lower efficiency. Specifically, dmax can be understood as the maximum axial or radial width of the multiple metal strips 30.

[0067] 0.15≤dmax / hdn≤≤0.3 When the size of the metal strip 30 is too small, it is inconvenient to insert the metal strip 30 during the installation of the rotor core 10, resulting in low production efficiency. When the size of the metal strip 30 is too large, the hollowing ratio of the magnetic channel 12 of the rotor core 10 will be large, resulting in local magnetic circuit saturation, increased iron loss of the motor and low efficiency.

[0068] ∑hn≤0.2R, this formula can be understood as the ratio of the size of all metal bars 30 in the D axis to the width R of the rotor core 10 in the D axis is less than or equal to 0.2. When ∑hn is too large and greater than 0.2R, more guide bar slots 13 corresponding to the metal bars 30 will be opened on the rotor core 10, so that the proportion of the guide bar slots 13 is large, the amount of metal bars 30 is increased, and the cost of the motor is increased.

[0069] Specifically, when the rotor structure meets the above size range, the magnet 20 and the metal strip 30 are inserted into the rotor, and the metal end plates at both ends of the rotor are welded and connected to the metal strip 30 to form a complete "Lenz ring" structure. In the case of a sudden change in the stator magnetic field, the metal strip 30 cuts the stator magnetic field according to the Lenz principle, and the formed current loop generates a protective magnetic field in the opposite direction, thereby improving the anti-demagnetization ability of the permanent magnet motor.

[0070] With such a configuration, when the motor structure meets the above size range, the motor has the best anti-demagnetization capability, and the number of metal strips 30 used is small, so the motor has the best cost performance.

[0071] like Figure 8 As shown, when the motor of the present invention is started, overloaded 2.5 times, and short-circuited, the demagnetization rate of the permanent magnet 20 of the motor is less than 1%, which is reversible demagnetization and is lower than that of conventional permanent magnet motors. Fig. 9 As shown, the safety factor of the motor of the present invention is increased to 2.5 at the rated speed, and the safety factor is 1.3 at twice the rated speed, which is 50% higher than that of the conventional permanent magnet motor, and the reliability of the motor is greatly improved.

[0072] It should be noted that ∑hn here is preferably the sum of the non-overlapping widths of the plurality of magnetic channels 12; ∑αn is preferably the sum of the non-overlapping central angles corresponding to the plurality of metal strips 30. Preferably, the cross-section of the metal strip 30 may be circular, elliptical, square or other shapes to facilitate the manufacturing and processing of the metal strip 30.

[0073] In this embodiment, the rotor structure has a plurality of rotor core poles 14, a magnetic steel slot structure 11 is arranged between two adjacent rotor core poles 14, and the central angle corresponding to each rotor core pole 14 is αp; the symmetry axis of two adjacent rotor core poles 14 is the Q axis, and the symmetry axis of each magnetic steel slot structure 11 is the D axis; one of the two adjacent magnetic steel slot structures 11 is provided with a plurality of metal strips 30 arranged at intervals along the D axis direction, and the other of the two adjacent magnetic steel slot structures 11 is provided with a plurality of metal strips 30 arranged at intervals along the Q axis direction. With such a structural arrangement, more magnetic circuit space can be released, and the anti-saturation capability of the motor can be improved.

[0074] Specifically, the cross-section of the metal strip 30 is a circular cross-section, an elliptical cross-section, or a square cross-section, so as to facilitate production. Preferably, the cross-section of the metal strip 30 is a circular cross-section, so as to reduce the internal skin effect of the metal strip 30.

[0075] Specifically, at least two guide bar slots 13 are provided on the rotor core 10 . The at least two guide bar slots 13 are provided in one-to-one correspondence with at least two metal bars 30 . The shape of each guide bar slot 13 matches the shape of the corresponding metal bar 30 .

[0076] Specifically, the two ends of the metal strip 30 can be fixedly connected to the first metal part 40 and the second metal part 50 respectively to improve the structural stability of the metal strip 30, the first metal part 40 and the second metal part 50, to ensure that the three can fit firmly when the rotor core 10 rotates at a high speed, and to share most of the centrifugal force through the metal strip 30 to improve the overall structural strength of the rotor structure.

[0077] In this embodiment, in order to facilitate the connection between the two ends of the metal strip 30 and the first metal member 40 and the second metal member 50, one end of the metal strip 30 can be welded to the first metal member 40, and the other end of the metal strip 30 can be welded to the second metal member 50. In this way, the problem of low structural strength caused by too many slot structures on the rotor core 10 can be avoided, and the reliability of the rotor structure is improved. In addition, the above structure can facilitate the formation of a complete Lenz ring structure. In the case of a sudden change in the stator magnetic field, a protective magnetic field in a direction opposite to the stator magnetic field is generated between the metal strip 30 and the first metal member 40 and the second metal member 50 according to the Lenz distance, thereby improving the anti-demagnetization ability of the motor.

[0078] To facilitate welding, a first mounting groove 41 corresponding to one end of the metal strip 30 may be provided on the first metal member 40 , and a second mounting groove 51 corresponding to the other end of the metal strip 30 may be provided on the second metal member 50 .

[0079] The first metal member 40 and / or the second metal member 50 is a plate-shaped structure.

[0080] In this embodiment, the first metal member 40 is attached to one end of the rotor core 10; the second metal member 50 is attached to the other end of the rotor core 10 to ensure the stable connection between the first metal member 40 and the second metal member 50 and the rotor core 10, thereby improving the stability of the overall structure. Specifically, by attaching the first metal member 40 and the second metal member 50 to the rotor core 10, it is easy to ensure that the metal bar 30 is connected to the first metal member 40 and the second metal member 50, respectively, so that the current forms a loop.

[0081] Specifically, the magnetic field generated after the conductor embedded in the stator slot is energized rotates along the circumference of the air gap. Under normal working conditions, the stator magnetic field is in the same direction as the rotor magnetic field, and the stator magnetic field leads the rotor magnetic field by a certain angle. The rotor magnetic field of the permanent magnet motor is generated by the permanent magnet 20 inserted in the rotor core 10, and the permanent magnet 20 is arranged alternately along the rotor circumference with N / S poles. When irreversible demagnetization is not generated, the remanence Br of the permanent magnet 20 and the external magnetic field strength H meet the product specifications (demagnetization curve) of the permanent magnet 20 when it leaves the factory; when irreversible demagnetization occurs, the remanence of the permanent magnet 20 decreases and the magnetic properties weaken. Lenz's law is that the effect of the induced current always resists the cause of the induced current. The Lenz ring is composed of a metal strip 30 and a first metal piece 40 and a second metal piece 50 at both ends of the rotor core 10 in the axial direction. The metal strip 30 can be made of aluminum, copper or other metal conductive materials. The shape and size of the metal strip 30 are the same as the shape and size of the guide bar hole on the rotor core 10. When used, the metal strip 30 is embedded in the guide bar hole along the axial direction. The first metal member 40 and the second metal member 50 may be plate-shaped structures. The first metal member 40 and the second metal member 50 are provided with first mounting grooves 41 and second mounting grooves 51 respectively corresponding to the guide bar holes. When in use, the first metal member 40 and the second metal member 50 are closely attached to the rotor core 10. After the metal bar 30 passes through the guide bar hole, both ends thereof pass through the first mounting grooves 41 and second mounting grooves 51 respectively. The first metal member 40, the metal bar 30 and the second metal member 50 are fixed by welding to form a loop, namely a "Lenz ring".

[0082] A second embodiment of the present invention provides a motor, comprising the rotor structure provided in the first embodiment above.

[0083] From the above description, it can be seen that the above-mentioned embodiment of the present invention achieves the following technical effects: when the stator magnetic field of the inverter input suddenly changes, the metal strip generates a protective magnetic field in the rotor structure that is opposite to the stator demagnetization magnetic field. The protective magnetic field counteracts the stator magnetic field and offsets part of the stator demagnetization magnetic field, thereby improving the anti-demagnetization ability. The above-mentioned 'Lenz ring' is composed of a metal strip in the rotor structure and a first metal part and a second metal part at both ends. The two are firmly matched. Therefore, when the rotor rotates at high speed, the metal strip in the rotor structure can share most of the centrifugal force, thereby improving the strength of the rotor structure.

[0084] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0085] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0086] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0087] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0088] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0089] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A rotor structure, characterized in that: include: A rotor core (10) and a magnet (20), wherein at least two magnetic steel slot structures (11) are arranged at intervals on the rotor core (10), the at least two magnetic steel slot structures (11) divide the rotor core (10) into a plurality of magnetic conductive channels (12), and the magnet (20) is installed in each of the magnetic steel slot structures (11); at least two metal strips (30), one of the at least two metal strips (30) being inserted into one of the magnetic conductive channels (12), the other of the at least two metal strips (30) being inserted into the other magnetic conductive channel (12), and two ends of each of the metal strips (30) being extended out of two ends of the rotor core (10); A first metal member (40) and a second metal member (50) are respectively arranged at two ends of the rotor core (10), and two ends of each metal bar (30) are respectively connected to the first metal member (40) and the second metal member (50).

2. The rotor structure according to claim 1, characterized in that: The plurality of magnetic conductive channels (12) include a first magnetic conductive channel (121), the first magnetic conductive channel (121) being formed between two adjacent magnetic steel slot structures (11), and at least one metal strip (30) being inserted into the first magnetic conductive channel (121); and / or, The plurality of magnetic conductive channels (12) include a second magnetic conductive channel (122), each of the magnetic steel slot structures (11) includes at least two magnetic steel slots spaced apart in the radial direction of the rotor core (10), the second magnetic conductive channel (122) is formed between two adjacent magnetic steel slots, and at least one metal strip (30) is inserted into the second magnetic conductive channel (122); and / or, The plurality of magnetic conductive channels (12) include a third magnetic conductive channel (123), wherein one side of each magnetic steel slot structure (11) located close to the outer edge of the rotor core (10) and the outer edge of the rotor core (10) form the third magnetic conductive channel (123), and at least one metal strip (30) is inserted into the third magnetic conductive channel (123).

3. The rotor structure according to claim 1, characterized in that: The plurality of magnetic conductive channels (12) include a second magnetic conductive channel (122) and a third magnetic conductive channel (123); each of the magnetic steel slot structures (11) includes at least two magnetic steel slots spaced apart along the radial direction of the rotor core (10); the second magnetic conductive channel (122) is formed between two adjacent magnetic steel slots; and the magnetic steel slots of each of the magnetic steel slot structures (11) located near the outer edge of the rotor core (10) and the rotor core (10) form the third magnetic conductive channel (123); At least one of the metal strips (30) is inserted into the second magnetic conductive channel (122), and at least one of the metal strips (30) is inserted into the third magnetic conductive channel (123); the at least one of the metal strips (30) in the second magnetic conductive channel (122) and the at least one of the metal strips (30) in the third magnetic conductive channel (123) are spaced apart in the radial direction of the rotor core (10).

4. The rotor structure according to claim 3, characterized in that: At least two of the metal strips (30) are inserted into the second magnetic conductive channel (122); At least two of the metal strips (30) in the second magnetic conductive channel (122) are arranged at intervals along the extension direction of the second magnetic conductive channel (122); or, At least one of the metal strips (30) in the second magnetic conductive channel (122) and at least one of the metal strips (30) in the third magnetic conductive channel (123) are arranged at intervals along the circumferential direction of the rotor core (10).

5. The rotor structure according to claim 3, characterized in that: At least two of the metal strips (30) are inserted into the third magnetic conductive channel (123); at least two of the metal strips (30) in the third magnetic conductive channel (123) and at least one of the metal strips (30) in the second magnetic conductive channel (122) are arranged at intervals along the radial direction of the rotor core (10); and / or, At least two of the metal strips (30) are inserted into the second magnetic conductive channel (122); the plurality of magnetic conductive channels (12) include a first magnetic conductive channel (121); the first magnetic conductive channel (121) is formed between two adjacent magnetic steel slot structures (11); at least one of the metal strips (30) is inserted into the first magnetic conductive channel (121); the at least one of the metal strips (30) in the first magnetic conductive channel (121), the at least one of the metal strips (30) in the second magnetic conductive channel (122), and the at least one of the metal strips (30) in the third magnetic conductive channel (123) are arranged at intervals along the circumferential direction of the rotor core (10); 6. The rotor structure according to claim 1, characterized in that: The rotor structure comprises a plurality of rotor core poles (14), a magnetic steel slot structure (11) is arranged between two adjacent rotor core poles (14), and the central angle corresponding to each rotor core pole (14) is αp; the symmetry axis of the two adjacent rotor core poles (14) is the Q axis, and the symmetry axis of each magnetic steel slot structure (11) is the D axis; along the extension direction of the Q axis, the widths of the plurality of magnetic conductive channels (12) in each rotor core pole (14) are sequentially from hq1 to hqn; along the direction of the D axis, the widths of the plurality of magnetic conductive channels (12) from the inner circle of the rotor core (10) to the outer circle of the rotor core (10) are sequentially from hd1 to hdn; along the extension direction of the D axis, the widths of the plurality of magnetic conductive channels (12) from the inner circle of the rotor core (10) to the outer circle of the rotor core (10) are sequentially from hd1 to hdn. The widths of the plurality of metal strips (30) between the outer circle of the rotor core (10) are sequentially from h1 to hn, and the sum of the diameters of the plurality of metal strips (30) between the inner circle of the rotor core (10) and the outer circle of the rotor core (10) is ∑hn; the distance between the inner circle of the rotor core (10) and the outer circle of the rotor core (10) is R; the maximum width of the metal strips (30) in the D-axis direction or the Q-axis direction is dmax; along the peripheral direction of the outer circle of the rotor core (10), the central angles corresponding to the plurality of metal strips (30) in each rotor core pole (14) are sequentially from αq1 to αqn, and the sum of the central angles corresponding to the plurality of metal strips (30) in each rotor core pole (14) is ∑αn; Where, ∑αn / αp≤0.2; and / or, 0.15≤dmax / hqn≤0.3; and / or, 0.15≤dmax / hdn≤≤0.3; and / or ∑hn≤0.2R.

7. The rotor structure according to claim 1, characterized in that: The rotor structure comprises a plurality of rotor core poles (14), a magnetic steel slot structure (11) is arranged between two adjacent rotor core poles (14), and the central angle corresponding to each rotor core pole is αp; the axis of symmetry of the two adjacent rotor core poles (14) is the Q axis, and the axis of symmetry of each magnetic steel slot structure (11) is the D axis; a plurality of metal strips (30) arranged at intervals along the D axis direction are arranged on one of the two adjacent magnetic steel slot structures (11), and a plurality of metal strips (30) arranged at intervals along the Q axis direction are arranged on the other of the two adjacent magnetic steel slot structures (11).

8. The rotor structure according to claim 1, characterized in that: The cross-sections of the metal strips (30) are all circular, elliptical, or square; and / or, At least two guide bar grooves (13) are arranged on the rotor core (10), and the at least two guide bar grooves (13) are arranged in one-to-one correspondence with the at least two metal bars (30), and the shape of each guide bar groove (13) is adapted to the shape of the corresponding metal bar (30).

9. The rotor structure according to any one of claims 1 to 8, characterized in that: One end of the metal strip (30) is welded to the first metal member (40); and / or, The other end of the metal strip (30) is welded to the second metal member (50); and / or, The first metal component (40) and / or the second metal component (50) is a plate-shaped structure.

10. The rotor structure according to any one of claims 1 to 8, characterized in that: The first metal part (40) is attached to one end of the rotor core (10); and / or the second metal part (50) is attached to the other end of the rotor core (10).

11. A motor, characterized in that: A rotor structure comprising any one of claims 1 to 10.

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