Non-overlapping winding motor rotor structure with low frequency converter capacity dependence

Abstract

The invention relates to the technical field of motors, and discloses a non-overlapping winding motor rotor structure with low frequency converter capacity dependence, which comprises a rotor body, the winding structure is a two-pole winding, a first pole comprises a plurality of groups of first through grooves, a second pole comprises a plurality of groups of second through grooves, the plurality of groups of first through grooves and the plurality of groups of second through grooves are distributed in the circumferential direction of the rotor body and are arranged in a staggered manner, and winding wires are arranged in the first through grooves and the second through grooves; and the supporting conversion piece is arranged on the rotor body, and the side wall of the supporting conversion piece is located in the first through groove. The invention provides a large alternating current excitation motor structure with high reliability, low frequency converter dependence and certain inertia, the capacity of the frequency converter on the rotor side is reduced, the dependence on the frequency converter is reduced, certain inertia support and current impact resistance are provided for a unit, the torque density of the motor is increased, and the economical efficiency is further improved.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and in particular to a non-overlapping winding motor rotor structure with low inverter capacity dependence. Background Technology

[0002] Traditional distributed winding 100 MW-class AC excitation motors are expensive due to the high capacity requirements of frequency converters, and the unit capacity is highly dependent on the frequency converter capacity. Furthermore, during operating condition switching, the high motor acceleration can lead to rotor end winding deformation. This poses a risk of unstable operation during frequent start-stop cycles of variable-speed pumped storage units. In addition, the speed and frequency of doubly-fed induction motors are completely decoupled, and the energy storage system lacks damping and inertia.

[0003] Therefore, there is an urgent need for a non-overlapping winding motor rotor structure with low inverter capacity dependence to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide a non-overlapping winding motor rotor structure with low inverter capacity dependence, so as to solve the problems existing in the prior art.

[0005] To achieve the above objectives, the present invention provides the following solution: The present invention provides a non-overlapping winding motor rotor structure with low inverter capacity dependence, comprising:

[0006] Rotor body;

[0007] The winding structure is a two-pole winding, wherein the first pole includes several sets of first through slots and the second pole includes several sets of second through slots. The several sets of first through slots and the several sets of second through slots are distributed along the circumference of the rotor body, and the several sets of first through slots and the several sets of second through slots are staggered. Winding wires are provided in both the first through slots and the second through slots.

[0008] A support conversion element is disposed on the rotor body, and the sidewall of the support conversion element is located in the first through groove.

[0009] According to the present invention, a non-overlapping winding motor rotor structure with low inverter capacity dependence is provided, wherein the first through slot and the second through slot include two slot bodies, and adjacent slot bodies on adjacent two first through slots are electrically connected, and adjacent slot bodies on adjacent two second through slots are electrically connected.

[0010] According to the present invention, a non-overlapping winding motor rotor structure with low inverter capacity dependence is provided, wherein the number of phase slots in the slot is one.

[0011] According to the present invention, a non-overlapping winding motor rotor structure with low inverter capacity dependence is provided. The supporting conversion component includes two rings, which are respectively fixedly connected to both ends of the rotor body. A plurality of guide bars are fixedly connected between the two rings along the circumferential direction. The plurality of guide bars correspond one-to-one with a plurality of slots on a plurality of sets of first through slots. The guide bars are adapted to the slots on the first through slots.

[0012] According to the present invention, a non-overlapping winding motor rotor structure with low inverter capacity dependence is provided, wherein a plurality of reinforcing ribs are fixedly connected along the circumferential direction on the ring.

[0013] According to the present invention, a non-overlapping winding motor rotor structure with low inverter capacity dependence is provided, wherein the outer wall of the annulus is provided with a boss structure, the boss structure being used to block the winding wires.

[0014] According to the present invention, a non-overlapping winding motor rotor structure with low inverter capacity dependence is provided, wherein the inner diameter of the slot in the first through slot is greater than the radius of the slot shoulder and the inlet of the slot.

[0015] According to the present invention, a non-overlapping winding motor rotor structure with low inverter capacity dependence is provided, wherein the outer ring of the slot on the first through slot is the conductor bar, the inner ring of the slot on the first through slot is the winding wire, and the winding wire is a magnetic field enhancement winding.

[0016] According to the present invention, a non-overlapping winding motor rotor structure with low inverter capacity dependence is provided, wherein the winding of the same phase is placed in the slot of the second through slot, and different phases are placed in the two slots respectively.

[0017] According to the present invention, a non-overlapping winding motor rotor structure with low inverter capacity dependence is provided, wherein a buckle plate is provided at the radial overlap of the winding lines of the first through slot and the second through slot.

[0018] Compared with the prior art, the present invention has the following advantages and technical effects:

[0019] This invention provides a non-overlapping winding motor rotor structure with low inverter capacity dependence. The preferred overall structure is a two-pole, twelve-slot structure, where the first pole includes six sets of first through slots, and the second pole includes six sets of second through slots. The first and second through slots are alternately distributed without intersection. A support conversion element, positioned within the first through slot, directly participates in electromechanical energy conversion, reducing the inverter capacity on the rotor side and decreasing dependence on the inverter. Simultaneously, the damping characteristics of the support conversion element provide inertia support and current surge resistance for the unit, improving the utilization rate of the second through slots, increasing the motor's torque density, and further enhancing economic efficiency. This application provides a highly reliable, low inverter-dependent, and inertia-based large AC excitation motor structure, reducing the inverter capacity on the rotor side, decreasing dependence on the inverter, providing inertia support and current surge resistance for the unit, increasing the motor's torque density, and further improving economic efficiency. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the buckle structure of the present invention;

[0023] Figure 3 This is a schematic diagram of the supporting conversion component structure of the present invention;

[0024] Figure 4 This is a schematic diagram showing the distribution of the first and second through slots in this invention;

[0025] Figure 5 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0026] The components include: 1. Rotor body; 2. First through slot; 3. Second through slot; 4. Circular ring; 5. Guide bar; 6. Reinforcing rib; 7. Buckle plate. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Example 1:

[0030] Reference Figures 1-4 The present invention provides a non-overlapping winding motor rotor structure with low inverter capacity dependence, comprising:

[0031] Rotor body 1;

[0032] The winding structure is a two-pole winding, wherein the first pole includes several sets of first through slots 2 and the second pole includes several sets of second through slots 3. The several sets of first through slots 2 and several sets of second through slots 3 are distributed along the circumference of the rotor body 1, and the several sets of first through slots 2 and several sets of second through slots 3 are staggered. Winding wires are provided in both the first through slots 2 and the second through slots 3.

[0033] A support conversion component is provided on the rotor body 1, and the side wall of the support conversion component is located in the first through groove 2.

[0034] In one embodiment of the present invention, the overall structure is preferably a two-pole twelve-slot structure, that is, the first pole includes six sets of first through slots 2, and the second pole includes six sets of second through slots 3. The first through slots 2 and the second through slots 3 are alternately distributed and do not intersect. The supporting conversion component is set in the first through slot 2 and can directly participate in the electromechanical energy conversion, which can reduce the inverter capacity on the rotor side and reduce the dependence on the inverter. At the same time, the damping characteristics of the supporting conversion component can provide a certain inertia support and resistance to current impact for the unit, improve the utilization rate of the second through slot 3, increase the torque density of the motor, and further improve the economy.

[0035] As an optional implementation, the first through slot 2 and the second through slot 3 include two slot bodies, and the adjacent slot bodies on the two adjacent first through slots 2 are electrically connected, and the adjacent slot bodies on the two adjacent second through slots 3 are electrically connected.

[0036] Reference Figure 4 In one embodiment of the present invention, the rotor adopts a two-pole twelve-slot unit to ensure the radial non-overlapping structure of the motor. The first through slot 2 is a small slot structure, the second through slot 3 is a large slot structure, and the winding lines of adjacent small slot structures and adjacent large slot structures are connected. Red is the U phase, green is the V phase, and blue is the W phase.

[0037] As an optional implementation, the number of phase slots in the tank is one.

[0038] In one embodiment of the present invention, the number of phase slots in each slot is one.

[0039] As an optional implementation, the support conversion component includes two rings 4, which are fixedly connected to both ends of the rotor body 1. A plurality of guide bars 5 are fixedly connected between the two rings 4 along the circumferential direction. The plurality of guide bars 5 correspond one-to-one with a plurality of grooves on a plurality of first through slots 2, and the guide bars 5 are adapted to the grooves on the first through slots 2.

[0040] In one embodiment of the present invention, the ring 4 and the guide bar 5 are spliced ​​together to form a squirrel cage structure. The guide bar 5 is made of rectangular wire rod to ensure the fill factor of the slot in the first through slot 2. The squirrel cage structure directly participates in the electromechanical energy conversion, which can reduce the capacity of the frequency converter on the rotor side and reduce the dependence on the frequency converter. At the same time, the damping characteristics of the squirrel cage structure can provide a certain inertia support and resistance to current surges for the unit. This structure improves the utilization rate of the second through slot 3, increases the torque density of the motor, and further improves the economy.

[0041] As an optional implementation, the ring 4 is fixedly connected with several reinforcing ribs 6 along the circumferential direction.

[0042] In one embodiment of the present invention, the reinforcing ribs 6 on the ring 4 improve the strength of the ring 4.

[0043] As an alternative implementation, the outer wall of the ring 4 is provided with a boss structure, which is used to block the winding wires.

[0044] In one embodiment of the present invention, the inner diameter of the outer layer of the ring 4 along the axis is designed as a boss structure. The boss structure is used to fix the ends of other winding layers to prevent excessive centrifugal force from causing deformation of the rotor winding.

[0045] As an optional implementation, the inner diameter of the groove in the first through groove 2 is greater than the radius of the groove shoulder and the inner diameter of the groove.

[0046] In one embodiment of the present invention, the inner diameter of the slot on the first through slot 2 is larger than the radius of the slot shoulder and the inner diameter of the slot to ensure that there is no intersection during the winding process. The winding end also adopts an arc-shaped structure with a curvature consistent with the motor core.

[0047] As an optional implementation, the outer ring of the slot on the first through slot 2 is a conductor bar 5, and the inner ring of the slot on the first through slot 2 is a winding wire, and the winding wire is a magnetic field enhancement winding.

[0048] In one embodiment of the present invention, the grooves on the first through groove 2 are arranged in upper and lower layers. In each groove, the upper layer is a conductor bar 5 and the lower layer is a magnetic field enhancement winding, which adopts a toothed winding structure with a span of three.

[0049] In one embodiment of the present invention, the inner layer of the slot body on the first through slot 2 is a magnetic field enhancement structure, which is superimposed with the magnetic field generated by the winding in the slot body of the second through slot 3 to improve the magnetic field strength. In addition, the first through slot 2 and the second through slot 3 are arranged alternately, and the phase difference between the two can reduce the harmonic content in the air gap magnetic field and improve the power density of the motor.

[0050] As an alternative implementation, the windings of the same phase are placed in the slots of the second through slot 3, and different phases are placed in the slots respectively.

[0051] In one embodiment of the present invention, only the winding of the same phase is placed in each slot, the left and right slots belong to different phases, the span is three, and there is no intersecting structure in the axial, circumferential and radial directions.

[0052] As an optional implementation, a buckle plate 7 is provided at the radial overlap of the winding wires of the first through slot 2 and the second through slot 3.

[0053] In one embodiment of the present invention, a buckle plate 7 is used to limit the connection at the radial overlap of the winding wires.

[0054] The technical principle of this invention is as follows: Based on a traditional AC excitation motor, a squirrel cage structure is added. The squirrel cage automatically senses the magnetic field on the stator side, generating additional induced current and magnetic field. This magnetic field, combined with the rotor magnetic field, forms a composite magnetic field, which is further strengthened compared to the traditional structure. This improves the motor's torque density.

[0055] Example 2:

[0056] Reference Figure 5 In one embodiment of the present invention, a rat cage structure can be installed not only on the upper layer of the small trough but also on the top layer of the large trough. A space for installing the rat cage is excavated from the shoulder portion of the upper layer of the large trough.

[0057] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0058] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A rotor structure for a motor with non-overlapping windings and low inverter capacity dependence, characterized in that, include: Rotor body (1); The winding structure is a two-pole winding, wherein the first pole includes several sets of first through slots (2), and the second pole includes several sets of second through slots (3). The several sets of first through slots (2) and several sets of second through slots (3) are distributed along the circumference of the rotor body (1), and the several sets of first through slots (2) and several sets of second through slots (3) are staggered. Winding wires are provided in both the first through slots (2) and the second through slots (3). A support conversion component is disposed on the rotor body (1), and the sidewall of the support conversion component is located in the first through groove (2).

2. The rotor structure of a non-overlapping winding motor with low inverter capacity dependence according to claim 1, characterized in that: The first through slot (2) and the second through slot (3) each include two slot bodies. The adjacent slot bodies on the two adjacent first through slots (2) are electrically connected, and the adjacent slot bodies on the two adjacent second through slots (3) are electrically connected.

3. The rotor structure of a non-overlapping winding motor with low inverter capacity dependence according to claim 2, characterized in that: The number of phase slots in the tank is one.

4. The rotor structure of a non-overlapping winding motor with low inverter capacity dependence according to claim 2, characterized in that: The support conversion component includes two rings (4), which are fixedly connected to both ends of the rotor body (1). A plurality of guide bars (5) are fixedly connected between the two rings (4) along the circumferential direction. The plurality of guide bars (5) correspond one-to-one with a plurality of grooves on a plurality of sets of the first through grooves (2). The guide bars (5) are adapted to the grooves on the first through grooves (2).

5. A non-overlapping winding motor rotor structure with low inverter capacity dependence according to claim 4, characterized in that: Several reinforcing ribs (6) are fixedly connected along the circumferential direction on the ring (4).

6. The rotor structure of a non-overlapping winding motor with low inverter capacity dependence according to claim 4, characterized in that: The outer wall of the ring (4) is provided with a boss structure, which is used to block the winding wire.

7. The rotor structure of a non-overlapping winding motor with low inverter capacity dependence according to claim 1, characterized in that: The inner diameter of the groove on the first through groove (2) is greater than the radius of the groove shoulder and the inner diameter of the groove.

8. A non-overlapping winding motor rotor structure with low inverter capacity dependence according to claim 4, characterized in that: The outer ring of the slot on the first through slot (2) is the conductor bar (5), and the inner ring of the slot on the first through slot (2) is the winding wire, and the winding wire is a magnetic field enhancement winding.

9. A non-overlapping winding motor rotor structure with low inverter capacity dependence according to claim 2, characterized in that: The windings of the same phase are placed in the slots of the second through slot (3), and different phases are placed in the slots of the two slots respectively.

10. A non-overlapping winding motor rotor structure with low inverter capacity dependence according to claim 2, characterized in that: A buckle plate (7) is provided at the radial overlap of the winding wires of the first through slot (2) and the second through slot (3).

Images