Direct start synchronous reluctance motor rotor structure, motor

Abstract

The present invention provides a direct-start synchronous reluctance motor rotor structure and a motor. The direct-start synchronous reluctance motor rotor structure comprises: a rotor core, a plurality of slit slots are arranged on the rotor core, a filling slot is arranged at both ends of each slit slot to form a magnetic barrier layer, the first end of the filling slot is arranged adjacent to the slit slot, the second end of the filling slot is arranged to extend outward along the radial direction of the rotor core, and the second end of at least one filling slot and the side wall on the d-axis side away from the rotor core are provided with a bevel structure, so that the d-axis magnetic flux of the rotor core will not suddenly change when entering the stator along the channel formed at the bevel structure. Such a setting can reduce the motor reluctance torque pulsation, thereby reducing the vibration noise generated thereby, and can also increase the d-axis inductance, increase the difference between the d-axis and q-axis magnetic fluxes, generate a larger reluctance torque, increase the output torque of the motor having the rotor structure, and improve the motor efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of motor equipment, and in particular to a direct-start synchronous reluctance motor rotor structure and a motor. Background Art

[0002] The direct-start synchronous reluctance motor combines the structural characteristics of the induction motor and the synchronous reluctance motor. It starts by generating torque through squirrel cage induction, and achieves constant speed operation by generating reluctance torque through the rotor inductance difference. It can be directly connected to the power supply to start operation. Compared with the direct-start permanent magnet motor, the direct-start synchronous reluctance motor does not have rare earth permanent magnet materials and does not have demagnetization problems. The motor cost is low and the reliability is good. Compared with the asynchronous motor, it has high efficiency and constant speed. When the direct-start synchronous reluctance motor starts, the working principle is similar to that of the asynchronous motor, and it starts through asynchronous torque. When it enters the synchronous speed, the asynchronous torque is 0. At this time, the working principle is the same as that of the reluctance motor, and it runs synchronously through the reluctance torque.

[0003] Traditional synchronous reluctance motors require a driver for starting and controlling operation, which is costly and difficult to control. In addition, the driver accounts for a part of the loss, which reduces the efficiency of the entire motor system. In the prior art, the patent publication number CN106537740A provides a rotor, a reluctance machine and a manufacturing method for a rotor, wherein the filling material of the rotor flux cutoff portion reaches the rotor periphery and forms a part of the rotor periphery. After the material is filled in the flux cutoff portion, cutting processing is required, which takes a long time to manufacture, has low efficiency, high manufacturing cost, and large motor torque pulsation and vibration noise. The patent publication number CN207320974U provides a self-starting synchronous reluctance motor with an asymmetric structure rotor core to reduce torque pulsation, thereby suppressing or reducing electromagnetic noise and electromagnetic vibration caused by torque pulsation. However, due to the use of an asymmetric structure, new electromagnetic forces will be introduced, resulting in new electromagnetic noise problems. In the prior art, it is difficult to simultaneously achieve high efficiency, low noise, and high starting capacity synchronous design, and the prior art often has some defects. Summary of the invention

[0004] The main purpose of the present invention is to provide a direct-start synchronous reluctance motor rotor structure and motor to solve the problem of high vibration and noise in the prior art, so as to improve the motor reluctance torque, improve the motor efficiency, and increase the motor starting ability.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a direct-start synchronous reluctance motor rotor structure is provided, comprising: a rotor core, a plurality of slit slots are arranged on the rotor core, a filling slot is arranged at both ends of each slit slot to form a magnetic barrier layer, a first end of the filling slot is arranged adjacent to the slit slot, a second end of the filling slot is extended outwardly along the radial direction of the rotor core, and a bevel structure is arranged on the side wall of the second end of at least one filling slot and away from the d-axis side of the rotor core, so that the d-axis magnetic flux of the rotor core will not undergo a sudden change when entering the stator along the channel formed at the bevel structure.

[0006] Further, an included angle between a sidewall of the filling groove on a side away from the d-axis and the oblique edge structure disposed on the sidewall is θ, wherein 125°≤θ≤165°.

[0007] Further, 145°≤θ≤155°.

[0008] Furthermore, the second ends of all the filling slots are provided with bevel structures, or the second ends of the filling slots arranged at intervals are provided with bevel structures.

[0009] Furthermore, the distance from the first end to the second end of the hypotenuse structure is k, and the width of the filling groove is w, wherein 0.3w≤k<w.

[0010] Further, the angle of θ is set to gradually increase in a direction gradually away from the d-axis.

[0011] Furthermore, the plurality of slit grooves and the filling grooves may be formed by combining a linear structure and an arc structure.

[0012] Further, the second end of the filling slot extends outwardly along the radial direction of the rotor core, and at least part of the second end of the filling slot is connected to the outer circumference of the rotor to form an open slot.

[0013] Furthermore, the width of the opening slot is m, wherein 0.1w≤m≤0.7w.

[0014] Furthermore, the filling slot and the adjacent slit slot are arranged at an angle, and the magnetic conductive channel formed between the side walls of two adjacent filling slots is arranged parallel to the d-axis or at an angle.

[0015] Furthermore, the length of the filling groove is gradually increased along the direction close to the d-axis.

[0016] Furthermore, the width between two adjacent filling grooves is gradually reduced in a direction away from the d-axis.

[0017] Furthermore, the width of the slit groove is arranged to gradually decrease outward along the radial direction of the rotor core.

[0018] Furthermore, the length of the slit slot is arranged to gradually decrease outward along the radial direction of the rotor core.

[0019] Furthermore, the width of the magnetic conductive channel formed between two adjacent slit slots is gradually reduced outward along the radial direction of the rotor core.

[0020] Furthermore, the filling slot is filled with a conductive non-magnetic material, and the conductive non-magnetic material and the conductive end rings at both ends of the rotor core form a squirrel cage structure.

[0021] Furthermore, the conductive non-magnetic material filled in the filling groove is consistent with the conductive end ring material, and more preferably, aluminum or aluminum alloy can be used.

[0022] Furthermore, the ratio of the filling area filled with the conductive magnetic isolation material to the total area of ​​all the filling grooves and the slit grooves is Q2, wherein 0.3≤Q2≤0.7.

[0023] Furthermore, a plurality of independent filling slots are provided at the outer edge of the rotor core at any magnetic pole, and reinforcing ribs are formed between adjacent independent filling slots. The width of the reinforcing ribs is L, wherein 0.5σ≤L<σ, and σ is the air gap width between the stator and the rotor core.

[0024] Furthermore, the ratio of the sum of the total width of all the slit slots on the q-axis and the width of the independent filling slots on the q-axis to the effective core width of the rotor core in the radial direction is Q1, wherein 0.35≤Q1≤0.5.

[0025] Furthermore, a first reinforcing rib is arranged between the filling slot and the slit slot in the magnetic barrier layer located in the same layer, and a second reinforcing rib is arranged between the filling slot and the outer edge of the rotor core.

[0026] Further, a width of the first reinforcing rib and / or the second reinforcing rib is L4, wherein 0.8σ≤L4≤3σ.

[0027] Furthermore, multiple independent filling slots are arranged at intervals along the circumference of the rotor core, and the central angle of the rotor core occupied by the multiple independent filling slots is α, where 0.1τ≤α≤0.4τ, where τ is the pole pitch angle, τ=180° / p, and p is the number of pole pairs.

[0028] Furthermore, the magnetic barrier layer formed by the slit groove and the filling grooves at both ends thereof is at least two layers.

[0029] According to another aspect of the present invention, a motor is provided, comprising a direct-start synchronous reluctance motor rotor structure, wherein the direct-start synchronous reluctance motor rotor structure is the direct-start synchronous reluctance motor rotor structure described above.

[0030] By applying the technical solution of the present invention, a bevel structure is provided at the second end of the filling slot and the side wall away from the d-axis side of the rotor core, so that the d-axis magnetic flux of the rotor core will not undergo a sudden change when entering the stator along the channel formed at the bevel structure. This arrangement can reduce the motor reluctance torque pulsation, thereby reducing the vibration noise generated thereby, and can also increase the d-axis inductance, increase the difference between the d-axis and q-axis magnetic fluxes, generate a larger reluctance torque, increase the output torque of the motor with the rotor structure, and improve the motor efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] 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:

[0032] Figure 1 A schematic structural diagram of a first embodiment of a direct-start synchronous reluctance motor rotor structure according to the present invention is shown;

[0033] Figure 2 A schematic structural diagram of a second embodiment of a direct-start synchronous reluctance motor rotor structure according to the present invention is shown;

[0034] Figure 3 Shows Figure 2 A is an enlarged structural diagram;

[0035] Figure 4a A schematic diagram of a magnetic circuit in which a filling slot has no bevel structure in the prior art;

[0036] Figure 4b A schematic diagram of a magnetic circuit of a filling slot with a bevel structure of a direct-start synchronous reluctance motor rotor structure according to the present invention;

[0037] Figure 5 A torque curve comparison diagram of the motor of the present invention and the motor of the prior art;

[0038] Figure 6 A comparison diagram of starting speed curves of the motor of the present invention and the motor of the prior art;

[0039] Figure 7 A schematic structural diagram of a third embodiment of a direct-start synchronous reluctance motor rotor structure according to the present invention is shown;

[0040] Figure 8 A schematic structural diagram of a fourth embodiment of a direct-start synchronous reluctance motor rotor structure according to the present invention is shown;

[0041] Fig. 9 A schematic structural diagram of a fifth embodiment of a direct-start synchronous reluctance motor rotor structure according to the present invention is shown;

[0042] Fig.10 A schematic diagram of a rotor cage structure of a direct-on-line synchronous reluctance motor according to the present invention is shown;

[0043] Fig.11 A schematic structural diagram of a sixth embodiment of a direct-start synchronous reluctance motor rotor structure according to the present invention is shown;

[0044] Fig.12 A structural schematic diagram of a sixth embodiment of a direct-on-line synchronous reluctance motor rotor structure according to the present invention is shown.

[0045] The above drawings include the following reference numerals:

[0046] 10. Rotor core;

[0047] 20. Slit slot;

[0048] 30. Filling slot; 31. Bevel structure;

[0049] 40. Independent filling tank;

[0050] 50. Strengthen the ribs;

[0051] 60. Conductive end ring. DETAILED DESCRIPTION

[0052] 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.

[0053] 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.

[0054] It should be noted that the terms "first", "second", etc. in the specification, claims and drawings of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0055] 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.

[0056] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in a variety of different forms and should not be construed as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of the present application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. In the accompanying drawings, for the sake of clarity, the thickness of the layers and regions may be enlarged, and the same reference numerals are used to represent the same devices, and thus their descriptions will be omitted.

[0057] Combination Figures 1 to 3 , Figure 4b and Figure 5 As shown, according to an embodiment of the present invention, a direct-start synchronous reluctance motor rotor structure is provided.

[0058] Specifically, Figure 1As shown, the rotor structure includes a rotor core 10. A plurality of slit slots 20 are provided on the rotor core 10. A filling slot 30 is provided at both ends of each slit slot 20 to form a magnetic barrier layer, and the first end of the filling slot 30 is provided adjacent to the slit slot 20. The second end of the filling slot 30 is provided to extend outwardly along the radial direction of the rotor core 10. A bevel structure 31 is provided at the second end of at least one filling slot 30 and away from the side wall of the d-axis side of the rotor core 10, so that the d-axis magnetic flux of the rotor core 10 will not undergo a sudden change when entering the stator along the channel formed at the bevel structure 31.

[0059] In this embodiment, a bevel structure 31 is provided at the second end of the filling slot 30 and on the side wall away from the d-axis side of the rotor core 10, so that the d-axis magnetic flux of the rotor core 10 will not change suddenly when entering the stator along the channel formed by the bevel structure 31. This arrangement can reduce the motor reluctance torque pulsation, thereby reducing the vibration noise generated thereby, and can also increase the d-axis inductance, increase the difference between the d-axis and q-axis magnetic fluxes, generate a larger reluctance torque, increase the output torque of the motor with the rotor structure, and improve the motor efficiency. Among them, Figure 4a FIG. 1 is a schematic diagram of a magnetic circuit without a bevel structure in the prior art. Figure 2 As shown in FIG. 1 , a bevel structure is provided on four adjacent filling slots 30 in one pole. Figure 1 In the process, all filling slots are provided with bevel structures, which can also be arranged at intervals ( Figure 7 as shown), or any combination of settings.

[0060] Among them, the angle between the side wall of the filling groove 30 away from the d-axis and the bevel structure 31 arranged on the side wall is θ, wherein 125°≤θ≤165°. More preferably, the angle satisfies: 145°≤θ≤155°. The distance from the first end to the second end of the bevel structure 31 is k, and the width of the filling groove 30 is w, wherein 0.3w≤k<w. The angle θ is set to gradually increase in the direction gradually away from the d-axis. By setting the bevel structure 31, the sudden change of magnetic resistance is reduced, the magnetic resistance torque pulsation of the motor is reduced, and at the same time, the d-axis inductance here can be increased to flow into the stator, thereby increasing the d-axis inductance.

[0061] The plurality of slit grooves 20 and the filling grooves 30 can be a linear structure, an arc structure, a combination of various shapes, etc. Fig. 9 The second end of the filling slot 30 extends outwardly in the radial direction of the rotor core 10, and at least part of the second end of the filling slot 30 is connected to the outer circumference of the rotor to form an open slot, as shown in FIG. Fig.11As shown, the width m of the open slot satisfies: 0.1w≤m≤0.7w. The open slot can reduce the q-axis inductance, improve the motor reluctance torque, and improve the motor efficiency. The filling slot 30 and the adjacent slit slot 20 are arranged at an angle, and the magnetic conductive channel formed between the side walls of the two adjacent filling slots 30 is parallel to the d-axis or arranged at an angle, wherein the angle is small so that the magnetic conductive channel is roughly parallel to the d-axis. The length of the filling slot 30 is gradually increased in the direction close to the d-axis. The width between the two adjacent filling slots 30 is gradually reduced in the direction away from the d-axis. Effectively improve the motor efficiency and the motor starting ability.

[0062] Furthermore, the width of the slit slot 20 is set to gradually decrease outward along the radial direction of the rotor core 10. The ratio of the sum of the total width of all the slit slots 20 on the q-axis and the width of the independent filling slot 40 on the q-axis to the radial effective core width of the core is Q1, wherein 0.35≤Q1≤0.5. The length of the slit slot 20 is set to gradually decrease outward along the radial direction of the rotor core 10, and the width of the magnetic conductive channel formed between two adjacent slit slots 20 is set to gradually decrease outward along the radial direction of the rotor core 10. Among them, the filling slot 30 is used to fill the conductive non-magnetic material, and the conductive non-magnetic material and the conductive end rings 60 at both ends of the rotor core 10 form a squirrel cage structure, such as Fig.10 As shown. The conductive non-magnetic material filled in the filling slot 30 is consistent with the conductive end ring material. Preferably, aluminum or aluminum alloy can be used. The ratio of the filling area filled with the conductive magnetic isolation material to the total area of ​​all the filling slots 30 and the slit slots 20 is 0.3-0.7, and more preferably, the ratio is 0.4-0.6. This setting can further improve the efficiency of the motor with this rotor structure. The squirrel cage structure can help the motor start, and the appropriate filling area can improve the motor starting ability. Among them, the effective core width is the width between the inner circle and the outer circle of the rotor core.

[0063] A plurality of independent filling slots 40 are also provided at the outer edge of the rotor core 10 at any magnetic pole, and reinforcing ribs 50 are formed between adjacent independent filling slots 40. The width of the reinforcing ribs 50 is L, wherein 0.5σ≤L<σ, σ is the air gap width between the stator and the rotor core 10. Such a setting can effectively reduce the torque pulsation of the motor. Figure 1 As shown, there are three independent filling slots 40, and two reinforcing ribs 50 are arranged between the three independent filling slots 40. The two reinforcing ribs are arranged in an eight-shaped shape and are symmetrical about the q axis. Multiple independent filling slots 40 can also be connected to form a whole, such as Figure 8 As shown, the motor starting capacity is increased.

[0064] Among them, Figure 2As shown, a plurality of independent filling slots 40 are arranged at intervals along the circumference of the rotor core 10, and the central angle of the rotor core 10 occupied by the plurality of independent filling slots 40 is α, wherein 0.1τ≤α≤0.4τ, wherein τ is the pole pitch angle, τ=180° / p, and p is the number of pole pairs. Such an arrangement can effectively improve the efficiency of the motor while ensuring the starting capability of the motor.

[0065] Furthermore, a first reinforcing rib is provided between the filling slot 30 and the slit slot 20 in the magnetic barrier layer of the same layer, and a second reinforcing rib is provided between the filling slot 30 and the outer periphery of the rotor. The width of the reinforcing rib is L4, where 0.8σ≤L4≤3σ. In this way, the strength of the rotor structure is ensured, magnetic leakage is reduced as much as possible, and the motor efficiency is improved.

[0066] Preferably, the magnetic barrier layer composed of the slit groove 20 and the filling grooves 30 at both ends thereof is at least two layers. Figure 1 to Figure 2 The magnetic barrier layers shown in the figure all have a four-layer structure.

[0067] The rotor structure in the above embodiment can be used in the technical field of motor equipment, that is, according to another aspect of the present invention, a motor is provided. The motor includes a direct-start synchronous reluctance motor rotor structure, which is the direct-start synchronous reluctance motor rotor structure mentioned above.

[0068] Specifically, the direct start synchronous reluctance motor rotor structure of the present application is adopted, and a bevel structure is provided at the end of the filling slot to reduce the sudden change of reluctance, reduce the reluctance torque pulsation of the motor, and thus reduce the vibration noise generated thereby. The bevel structure is provided, and at the same time, the d-axis inductance here can be increased to flow into the stator, increase the d-axis inductance, and increase the motor output torque.

[0069] By optimizing the design of the bevel structure at the end of the filling slot, the motor reluctance torque pulsation can be reduced, thereby reducing the vibration noise generated thereby, and the d-axis inductance can be increased, the difference between the d-axis and q-axis magnetic fluxes can be increased, a larger reluctance torque can be generated, the motor output torque can be increased, and the motor efficiency can be improved. Among them, the angle between the bevel structure edge and the corresponding filling slot edge is θ, which satisfies 125°≤θ≤165. More preferably, 145°≤θ≤155°, and a suitable angle range is selected to ensure the effect of the bevel structure. Further, the width between two adjacent filling slots is L1, and the width L1 between two adjacent filling slots gradually decreases in the direction away from the d-axis. The width of the slit slot is L2, and the width L2 of the slit slot gradually decreases in the direction away from the center of the rotor core. The width of the magnetic channel formed between two adjacent slit slots is L3, and the width L3 of the magnetic channel gradually decreases in the direction away from the center of the rotor core. The magnetic field strength of the magnetic channel close to the center of the rotor is strong, and the magnetic channel is designed to be wider to avoid magnetic field saturation affecting the motor output and efficiency.

[0070] The slit slots and the corresponding filling slots are combined to form a magnetic barrier layer, and all the filling slots are filled with conductive and non-magnetic materials, preferably aluminum or aluminum alloy, to achieve asynchronous starting of the motor. The magnetic barrier layer generates a difference in inductance between the d-axis and q-axis, generates a magnetic resistance torque, and maintains synchronous operation of the motor. The filling slots in the q-axis direction are composed of a plurality of independently divided filling slots, and the rib width between them is L, where 0.5σ≤L<σ, and σ is the air gap width between the stator core and the rotor core. The filling slots are divided by ribs, and the rib width is smaller than the air gap width. The pulsation generated by the interaction with the stator is reduced by the filling slots and ribs, thereby reducing the vibration noise of the motor.

[0071] The angle occupied by the filling slot in the q-axis direction, i.e., the independent filling slot, relative to the center of the rotor is α, where 0.1τ≤α≤0.4τ, where τ is the pole pitch angle, i.e., τ=180° / p, and p is the number of pole pairs. Preferably, 0.25τ≤α≤0.35τ. For this embodiment, p is 2, τ=90°, so 9°≤α≤36°, preferably, 22.5°≤α≤31.5°. In this way, the filling slot can be used as a magnetic barrier layer to further increase the d-axis magnetic resistance and reduce the d-axis magnetic flux, and can also be used as a starting cage to improve the starting performance of the motor. The filling slots and slit slots are arranged in pairs on the circumference of the rotor, and the magnetic barrier layer composed of the filling slots and the slit slots has at least two layers in the radial direction of the rotor core.

[0072] The width k of the bevel structure is smaller than the width w of the corresponding filling slot end. More preferably, 0.3w≤k≤0.7w. By setting a suitable bevel structure width, the effectiveness of the bevel structure can be ensured and magnetic leakage can be reduced. Figure 4b and Figure 4a This is a comparison chart of the effects of the bevel structure and the non-bevel structure on the motor magnetic field distribution of this application. After the bevel structure is set, the magnetic field can gradually transition into the stator through the cutout, avoiding sudden changes in the magnetic field, reducing the peak value of the electromagnetic torque, and achieving the purpose of reducing torque pulsation. At the same time, the cutout increases the width of the magnetic channel, increases the d-axis magnetic field flowing into the stator, increases the d-axis inductance, and ensures the output torque of the motor.

[0073] Among them, the extension direction of the filling slots at both ends of the slit slot is roughly parallel to the d-axis, so that the d-axis magnetic flux flows smoothly in the d-axis direction. The closer the filling slot is to the corresponding d-axis axis, the longer the extension length in the d-axis direction is, and the larger the filling slot area is. On the contrary, the farther the filling slot is from the corresponding d-axis axis, the shorter the extension length in the d-axis direction is, and the smaller the filling slot area is. The deep and narrow filling slot has a skin effect, and the unequal filling slot increases the pull-in torque during the starting process, which helps to improve the starting performance of the motor.

[0074] Furthermore, the filling slots and the slit slots are arranged in pairs on the circumference of the rotor. The magnetic barrier layer formed by the filling slots and the slit slots has at least two layers in the radial direction of the rotor core, forming paired poles and multiple layers of magnetic barriers, increasing the inductance gap and increasing the magnetic resistance torque;

[0075] Figure 5 This is a comparison chart of the motor torque curves of the present application technology and the prior art. It can be seen that by adopting the technical solution of the present application, the motor torque pulsation is reduced by about half, while the average torque of the motor is not reduced, achieving a good technical effect and helping to reduce the motor vibration noise generated thereby. Among them, the shapes of the filling slots and slit slots are not limited to straight lines or arc-shaped settings.

[0076] Figure 6 The comparison of the speed curves of the motor starting process of the present application technology and the prior art shows that the motor of the present application has a fast starting speed, a short starting and stabilization time, and a stronger starting ability. Fig.12 As shown, L is the width of the reinforcing rib 50, L1 is the width of the magnetic channel formed between the side walls of two adjacent filling slots, L2 is the width of the slit groove, L3 is the width of the magnetic channel formed between two adjacent slit grooves, and L4 is the width of the first reinforcing rib and the second reinforcing rib. In this embodiment, the width of the first reinforcing rib can be set to be consistent with or different from the width of the second reinforcing rib.

[0077] In addition to the above, it should be noted that "one embodiment", "another embodiment", "embodiment", etc. mentioned in this specification refer to the specific features, structures or characteristics described in conjunction with the embodiment included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure or characteristic in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of the present invention.

[0078] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0079] 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 direct-start synchronous reluctance motor rotor structure, characterized in that: include: A rotor core (10), wherein a plurality of slit slots (20) are provided on the rotor core (10), a filling slot (30) is provided at each end of each slit slot (20) to form a magnetic barrier layer, a first end of the filling slot (30) is provided adjacent to the slit slot (20), a second end of the filling slot (30) is provided extending outwardly in a radial direction of the rotor core (10), and a sidewall at the second end of at least one of the filling slots (30) and away from the d-axis side of the rotor core (10) is provided with a bevel structure (31), so that when the d-axis magnetic flux of the rotor core (10) enters the stator along a channel formed at the bevel structure (31), the magnetic flux does not undergo a sudden change; The length of the filling groove (30) is arranged to gradually increase along a direction close to the d-axis; The width between two adjacent filling grooves (30) is arranged to gradually decrease in a direction away from the d-axis; A plurality of independent filling slots (40) are also provided at the outer edge of the rotor core (10) at any magnetic pole, and reinforcing ribs (50) are formed between adjacent independent filling slots (40), wherein the width of the reinforcing ribs (50) is L, wherein 0.5σ≤L<σ, and σ is the width of the air gap between the stator and the rotor core (10).

2. The direct-start synchronous reluctance motor rotor structure according to claim 1, characterized in that: The included angle between the side wall of the filling groove (30) away from the d-axis and the oblique edge structure (31) arranged on the side wall is θ, wherein 125°≤θ≤165°.

3. The rotor structure of the direct-start synchronous reluctance motor according to claim 2, characterized in that: 145°≤θ≤155°.

4. The direct-start synchronous reluctance motor rotor structure according to claim 1, characterized in that: The second ends of all the filling slots (30) are provided with the bevel structure (31), or the second ends of the filling slots (30) arranged at intervals are provided with the bevel structure (31).

5. The direct-start synchronous reluctance motor rotor structure according to claim 1, characterized in that: The distance from the first end to the second end of the hypotenuse structure (31) is k, and the width of the filling groove (30) is w, wherein 0.3w≤k<w.

6. The rotor structure of the direct-start synchronous reluctance motor according to claim 2, characterized in that: The angle θ is set to gradually increase in a direction gradually away from the d-axis.

7. The direct-start synchronous reluctance motor rotor structure according to claim 1, characterized in that: The plurality of slit grooves (20) and the filling groove (30) can be formed by combining a linear structure and an arc structure.

8. The direct-start synchronous reluctance motor rotor structure according to claim 1, characterized in that: The second end of the filling slot (30) extends outwardly along the radial direction of the rotor core (10), and at least part of the second end of the filling slot (30) is connected to the outer circumference of the rotor to form an open slot.

9. The direct-start synchronous reluctance motor rotor structure according to claim 8, characterized in that: The width of the opening slot is m, wherein 0.1w≤m≤0.7w.

10. The direct-start synchronous reluctance motor rotor structure according to claim 1, characterized in that: The filling slot (30) and the adjacent slit slot (20) are arranged at an angle, and the magnetic conductive channel formed between the side walls of two adjacent filling slots (30) is parallel to the d-axis or arranged at an angle.

11. The direct-start synchronous reluctance motor rotor structure according to claim 1, characterized in that: The width of the slit groove (20) is arranged to gradually decrease outwards along the radial direction of the rotor core (10).

12. The direct-start synchronous reluctance motor rotor structure according to claim 1, characterized in that: The length of the slit groove (20) is arranged to gradually decrease outwards along the radial direction of the rotor core (10).

13. The rotor structure of the direct-start synchronous reluctance motor according to claim 1, characterized in that: The width of the magnetic conductive channel formed between two adjacent slit slots (20) is arranged to gradually decrease outwards along the radial direction of the rotor core (10).

14. The direct-start synchronous reluctance motor rotor structure according to claim 1, characterized in that: The filling groove (30) is filled with an electrically conductive non-magnetic material, and the electrically conductive non-magnetic material and the conductive end rings at both ends of the rotor core (10) form a squirrel cage structure.

15. The direct-start synchronous reluctance motor rotor structure according to claim 14, characterized in that: The conductive non-magnetic material filled in the filling groove (30) is consistent with the conductive end ring material.

16. The direct-start synchronous reluctance motor rotor structure according to claim 1, characterized in that: The ratio of the filling area filled with the conductive magnetic isolation material to the total area of ​​all the filling grooves (30) and the slit grooves (20) is Q2, wherein 0.3≤Q2≤0.

7.

17. The rotor structure of the direct-start synchronous reluctance motor according to claim 1, characterized in that: The ratio of the sum of the total width of all the slit slots (20) on the q-axis and the width of the independent filling slot (40) on the q-axis to the effective core width in the radial direction of the rotor core (10) is Q1, wherein 0.35≤Q1≤0.

5.

18. The direct-start synchronous reluctance motor rotor structure according to claim 1, characterized in that: A first reinforcing rib is provided between the filling slot (30) and the slit slot (20) in the magnetic barrier layer located in the same layer, and a second reinforcing rib is provided between the filling slot (30) and the outer edge of the rotor core (10).

19. The direct-start synchronous reluctance motor rotor structure according to claim 18, characterized in that: The width of the first reinforcing rib and / or the second reinforcing rib is L4, wherein 0.8σ≤L4≤3σ.

20. The direct-start synchronous reluctance motor rotor structure according to claim 1, characterized in that: The plurality of independent filling slots (40) are arranged at intervals along the circumference of the rotor core (10), and the central angle of the rotor core (10) occupied by the plurality of independent filling slots (40) is α, wherein 0.1τ≤α≤0.4τ, wherein τ is the pole pitch angle, τ=180° / p, and p is the number of pole pairs.

21. The direct-start synchronous reluctance motor rotor structure according to claim 1, characterized in that: The magnetic barrier layer formed by the slit groove (20) and the filling grooves (30) at both ends thereof is at least two layers.

22. A motor, comprising a direct-start synchronous reluctance motor rotor structure, characterized in that: The direct-start synchronous reluctance motor rotor structure is the direct-start synchronous reluctance motor rotor structure described in any one of claims 1 to 21.

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