CN212850014U - Rotor structure of self-starting hybrid excitation permanent magnet auxiliary reluctance motor and motor - Google Patents
Rotor structure of self-starting hybrid excitation permanent magnet auxiliary reluctance motor and motor Download PDFInfo
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- CN212850014U CN212850014U CN202021196988.0U CN202021196988U CN212850014U CN 212850014 U CN212850014 U CN 212850014U CN 202021196988 U CN202021196988 U CN 202021196988U CN 212850014 U CN212850014 U CN 212850014U
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Abstract
The utility model provides a rotor structure, motor of auxiliary reluctance motor of permanent magnetism of self-starting hybrid excitation. The rotor structure comprises a rotor core, wherein a plurality of magnetic barrier groove groups are formed in the rotor core and are arranged at intervals along the circumferential direction of the rotor core, each magnetic barrier groove group comprises a plurality of layers of magnetic barrier grooves, at least one permanent magnet unit is arranged in each magnetic barrier groove of at least one layer of the magnetic barrier groove groups, and at least one nonmagnetic conductor unit is arranged in each magnetic barrier groove of the other layer of the magnetic barrier groove groups. The permanent magnet auxiliary reluctance motor with the structure has the function of step-out protection. The non-magnetic conductor unit has the function of a damping winding, and when the motor operates synchronously, transient impact current of the rotor in various abnormal states can be guided to the end part of the rotor to be mutually offset and zeroed, so that the effects of avoiding heating of the rotor structure and demagnetization of magnetic steel are achieved. By adopting the rotor structure with the structure, the efficiency and the practicability of the motor are effectively improved.
Description
Technical Field
The utility model relates to an electrical equipment technical field particularly, relates to a rotor structure, motor of permanent magnetism auxiliary reluctance motor of self-starting hybrid excitation.
Background
The permanent magnet auxiliary reluctance motor is one of the development directions of the permanent magnet synchronous motor at present, and a ferrite auxiliary reluctance compressor in the field of household appliances gradually replaces a direct-current rare earth compressor. In the field of industrial motors, YE3 induction motors are being replaced by industrial reluctance motors, and rare earth permanent magnet synchronous motors driven by automobiles are also possibly replaced by permanent magnet auxiliary reluctance motors.
At present, an industrial permanent magnet auxiliary reluctance motor is applied to products such as a water pump or a fan. The bus driving motor belongs to a motor with high power and large output torque, a rare earth permanent magnet synchronous motor is generally used, but a permanent magnet auxiliary reluctance motor is adopted, cheap ferrite can be adopted as an auxiliary magnetic material, and an expensive rare earth permanent magnet is not needed, so that the bus driving motor is a great progress in the technology. In the prior art, the rotor structure of a reluctance motor in the motor industry has three types:
first, the magnetic barrier groove is not filled, and belongs to a non-auxiliary magnetic reluctance motor, i.e. a common reluctance motor, as shown in fig. 1. Secondly, the magnetic barrier groove is filled with a metal non-magnetic material, and the reluctance motor with the structure belongs to a self-starting non-auxiliary magnetic reluctance motor, as shown in fig. 2. Thirdly, as shown in fig. 3, the magnetic barrier grooves are filled with permanent magnets, and the permanent magnet auxiliary reluctance motor with the structure belongs to a full auxiliary reluctance motor without a self-starting function and belongs to a non-self-starting motor because the magnetic barrier grooves are completely filled with permanent magnets for auxiliary excitation.
The motor structure in the prior art has the following defects:
1. without asynchronous starting and running functions, once the load exceeds the maximum reluctance torque of the motor, the motor loses synchronous running, the rotating speed of the rotor gradually drops to zero, and the motor can be restarted only after the load is reduced.
2. There is not unusual protect function, and under stator unbalanced three phase or the asymmetric short circuit's the condition appeared in reluctance motor, transient state axial impulse current can appear in the rotor, and this electric current is very big, probably causes magnet steel demagnetization, perhaps the rotor generates heat and burns out.
3. The rotor core is laminated by punching sheets and is tensioned and fixed by rivets. This structure has the following disadvantages:
(1) additional eddy currents are created around the rivets (which would not occur without these set rivets), increasing rotor heating.
(2) Because the contact area of the rivet head and the iron core is small, and the iron core needs a certain 'laminating coefficient' (namely pressing), after the iron core is riveted tightly, the end part of the iron core is not flat, the riveting position of the iron core is different from other positions in axial size (the difference is large), and the eddy current of the rotor is increased.
SUMMERY OF THE UTILITY MODEL
A primary object of the present invention is to provide a rotor structure and a motor of a permanent magnet auxiliary reluctance motor with self-starting hybrid excitation, which solve the problem of easy heating of the rotor structure in the prior art.
In order to achieve the above object, according to an aspect of the present invention, there is provided a rotor structure of a self-starting hybrid excitation permanent magnet auxiliary reluctance machine, comprising: the rotor comprises a rotor core, wherein a plurality of magnetic barrier groove groups are formed in the rotor core and are arranged at intervals along the circumferential direction of the rotor core, each magnetic barrier groove group comprises a plurality of layers of magnetic barrier grooves, at least one permanent magnet unit is arranged in each magnetic barrier groove of at least one layer of the magnetic barrier groove groups, and at least one nonmagnetic conductor unit is arranged in each magnetic barrier groove of the other layer of the magnetic barrier groove groups.
Furthermore, each magnetic barrier groove group comprises a first layer of magnetic barrier groove and a second layer of magnetic barrier groove, the first layer of magnetic barrier groove is arranged close to one side of the shaft hole of the rotor core, the second layer of magnetic barrier groove is positioned on the outer side of the first layer of magnetic barrier groove, at least one nonmagnetic conductor unit is arranged in the first layer of magnetic barrier groove, and at least one permanent magnet unit is arranged in the second layer of magnetic barrier groove.
Further, the second layer of magnetic barrier grooves comprise a first composition section and a second composition section, a first end of the first composition section is arranged towards one side of the shaft hole, a second end of the first composition section extends outwards along the radial direction of the rotor core, a first end of the second composition section is arranged towards one side of the shaft hole, a distance is reserved between the first end of the second composition section and the first composition section, the first composition section and the second composition section are symmetrically arranged relative to the intersecting axis of the rotor core, a second end of the second composition section extends outwards along the radial direction of the rotor core, a permanent magnet unit is arranged in each of the first composition section and the second composition section, or a permanent magnet unit is arranged in one of the first composition section and the second composition section, and a non-magnetic conductor unit is arranged in the other of the first composition section and the second composition section.
Furthermore, each magnetic barrier groove group comprises a first layer of magnetic barrier groove and a second layer of magnetic barrier groove, the first layer of magnetic barrier groove is arranged close to one side of the shaft hole of the rotor core, the second layer of magnetic barrier groove is positioned on the outer side of the first layer of magnetic barrier groove, at least one permanent magnet unit is arranged in the first layer of magnetic barrier groove, and at least one non-magnetic conductor unit is arranged in the second layer of magnetic barrier groove.
Further, the second layer magnetic barrier groove includes first component section and second component section, the first end of first component section sets up towards shaft hole one side, the second end of first component section outwards extends the setting along rotor core's radial direction, the first end of second component section sets up towards shaft hole one side, and have the distance ground setting between the first end of second component section and the first component section, first component section and second component section set up about rotor core's quadrature axisymmetric, the second end of second component section outwards extends the setting along rotor core's radial direction, respectively be provided with a non-magnetic conductor unit in first component section and the second component section.
Furthermore, the first layer of magnetic barrier slots sequentially comprises a third group of sections, a fourth group of sections and a fifth group of sections, wherein the first ends of the third group of sections are arranged towards one side of the shaft hole of the rotor core, the second ends of the third group of sections extend along the radial direction of the rotor core, the first ends of the fourth group of sections and the first ends of the third group of sections are arranged at a distance, the second ends of the fourth group of sections are arranged away from the third group of sections, the first ends of the fifth group of sections and the second ends of the fourth group of sections have a distance, the second ends of the fifth group of sections extend along the radial direction of the rotor core, the fifth group of sections and the third group of sections are oppositely arranged, and the third group of sections, the fourth group of sections and the fifth group of sections are symmetrically arranged relative to the intersecting axis of the rotor core; wherein at least one of the third, fourth and fifth constituent segments is provided with a non-magnetic conductor unit.
Further, the distance between the first constituent segment and the second constituent segment is gradually increased outward in the radial direction of the rotor core.
Further, the rotor core is further provided with a first through hole, the first through hole is used for arranging a permanent magnet or a non-magnetic conductor, the first through hole is located between the first layer of magnetic barrier groove and the second layer of magnetic barrier groove, the first through hole is arranged close to the first end of the first assembly section and the first end of the second assembly section, or the first through hole is located on the outer side of the second layer of magnetic barrier groove, and the first through hole is arranged close to the first end of the first assembly section and the first end of the second assembly section.
Furthermore, the rotor core is further provided with a plurality of second through holes, the second through holes are used for arranging permanent magnets or non-magnetic conductors, the second through holes are arranged along the outer edge of the rotor core at intervals and are arranged in one-to-one correspondence with the magnetic barrier groove groups, the cross sections of the first through holes and the second through holes are the same or different in shape, and the cross sections of the first through holes and the second through holes are at least one of polygonal, circular and oval.
Furthermore, in each magnetic barrier slot group, the cross shaft of the rotor iron core is arranged through the first through hole and the second through hole.
Further, the magnetic barrier groove group comprises at least two layers of magnetic barrier grooves.
Further, the nonmagnetic conductor unit is made of copper or aluminum.
Further, the rotor structure further includes: the end baffle, end baffle are two, and two end baffles set up respectively in rotor core's both ends and are connected with non-magnetic conductor unit, and wherein, rotor core includes a plurality of iron core towards the piece, and a plurality of iron core towards the piece and compress tightly in order to form rotor core by end baffle.
Further, the number of poles of the rotor structure is P, where P is 2N and N is a positive integer greater than or equal to 1.
Further, the magnetic properties of the end baffles and the magnetic properties of the non-magnetic conductors are the same.
According to the utility model discloses an on the other hand provides a permanent magnetism auxiliary reluctance motor of self-starting hybrid excitation, including rotor structure, rotor structure is foretell rotor structure.
Use the technical scheme of the utility model, set up a plurality of magnetic barrier groove groups on rotor core, set up at least one permanent magnet unit in the one deck magnetic barrier inslot in magnetic barrier groove group, set up at least one conductor unit in another layer in magnetic barrier groove group, set up like this and make the motor that has this rotor structure have asynchronous starting function. When the motor is out of step due to overload, the motor can also asynchronously operate for a period of time in the mode of an induction motor, and the permanent magnet auxiliary reluctance motor with the structure has the function of out-of-step protection. Because the non-magnetic conductor unit is arranged in the rotor core, the non-magnetic conductor unit has the function of a damping winding, when the motor operates synchronously, transient impact current of the rotor in various abnormal states can be guided to the end part of the rotor to be mutually offset and zeroed, and the effects of avoiding heating of a rotor structure and demagnetization of magnetic steel are achieved. By adopting the rotor structure with the structure, the efficiency and the practicability of the motor are effectively improved.
Drawings
The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 shows an embodiment of the prior art in which only the magnetic barrier slots are formed in the rotor core;
FIG. 2 illustrates a prior art embodiment in which only non-magnetic conductors are filled in the flux barrier slots on the rotor core;
FIG. 3 illustrates a prior art embodiment in which the flux barrier slots on the rotor core are filled with only permanent magnets;
fig. 4 shows a schematic structural view of a first embodiment of a rotor core according to the present invention;
FIG. 5 shows a schematic cross-sectional view of the embodiment of FIG. 4 taken along line A-A;
FIG. 6 shows a cross-sectional structural schematic view of an embodiment of the rotor core of FIG. 4;
fig. 7 shows a schematic structural view of a second embodiment of a rotor core according to the present invention;
fig. 8 shows a schematic structural view of a first embodiment of a rotor core sheet according to the present invention;
fig. 9 shows a schematic structural view of a third embodiment of a rotor core according to the present invention;
fig. 10 shows a schematic structural view of a fourth embodiment of a rotor core according to the present invention;
fig. 11 shows a schematic structural view of a second embodiment of a rotor core sheet according to the present invention;
fig. 12 shows a schematic structural view of a fifth embodiment of a rotor core according to the present invention;
fig. 13 shows a schematic structural view of a sixth embodiment of a rotor core according to the present invention;
fig. 14 shows a schematic structural view of a seventh embodiment of a rotor core according to the present invention;
figure 15 shows a schematic structural view of a first embodiment of an end stop and a non-magnetic conductor of a rotor core according to the present invention;
figure 16 shows a schematic structural view of a second embodiment of an end stop and a non-magnetic conductor of a rotor core according to the present invention;
fig. 17 shows a schematic cross-sectional structure of the C-C direction embodiment of fig. 16.
Wherein the figures include the following reference numerals:
10. a rotor core;
11. a first layer of magnetic barrier grooves; 111. a third group of segments; 112. a fourth component section; 113. a fifth composition stage;
12. a second layer of magnetic barrier grooves; 121. a first composition segment; 122. a second composition segment;
13. a shaft hole;
14. a first through hole; 15. a second through hole;
20. a permanent magnet unit;
30. a non-magnetic conductor unit;
40. an end baffle.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Exemplary embodiments according to the present application will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to only the embodiments set forth herein. It is to be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art, in the drawings, it is possible to enlarge the thicknesses of layers and regions for clarity, and the same devices are denoted by the same reference numerals, and thus the description thereof will be omitted.
Referring to fig. 4 to 17, according to an embodiment of the present application, a rotor structure of a self-starting hybrid-excitation permanent magnet auxiliary reluctance machine is provided. Specifically, the rotor structure includes a rotor core 10. The rotor core 10 is provided with a plurality of magnetic barrier groove groups, the plurality of magnetic barrier groove groups are arranged at intervals along the circumferential direction of the rotor core 10, each magnetic barrier groove group comprises a plurality of layers of magnetic barrier grooves, at least one permanent magnet unit 20 is arranged in a magnetic barrier groove of at least one layer of the magnetic barrier groove groups, and at least one nonmagnetic conductor unit 30 is arranged in a magnetic barrier groove of another layer of the magnetic barrier groove groups.
In the embodiment, a plurality of magnetic barrier groove groups are arranged on a rotor core, at least one permanent magnet unit is arranged in one layer of magnetic barrier groove in each magnetic barrier groove group, and at least one conductor unit is arranged in the other layer of each magnetic barrier groove group, so that the motor with the rotor structure has an asynchronous starting function. When the motor is out of step due to overload, the motor can also asynchronously operate for a period of time in the mode of an induction motor, and the permanent magnet auxiliary reluctance motor with the structure has the function of out-of-step protection. Because the non-magnetic conductor unit is arranged in the rotor core, the non-magnetic conductor unit has the function of a damping winding, when the motor operates synchronously, transient impact current of the rotor in various abnormal states can be guided to the end part of the rotor to be mutually offset and zeroed, and the effects of avoiding heating of a rotor structure and demagnetization of magnetic steel are achieved. By adopting the rotor structure with the structure, the efficiency and the practicability of the motor are effectively improved. Meanwhile, aiming at the characteristics of multiple varieties and multiple working conditions of the existing permanent magnet synchronous motor, under the condition of keeping the structure of the rotor punching sheet unchanged, the magnetic barrier grooves can be filled in different combination modes between the permanent magnet and the non-magnetic conductor, so that the requirements of different working conditions are met, the new product development efficiency is greatly improved, and the new product development cost (the number of times of opening the die of the rotor punching sheet) is reduced. The step-out here refers to a situation where the rotor speed is lower than the stator rotating magnetic field speed (synchronous speed) when the permanent magnet synchronous motor is overloaded to a certain extent.
As shown in fig. 5 to 8, each of the barrier groove groups includes a first layer barrier groove 11 and a second layer barrier groove 12. The first layer of magnetic barrier grooves 11 are arranged close to one side of a shaft hole 13 of the rotor core 10, the second layer of magnetic barrier grooves 12 are arranged on the outer side of the first layer of magnetic barrier grooves 11, at least one nonmagnetic conductor unit 30 is arranged in the first layer of magnetic barrier grooves 11, and at least one permanent magnet unit 20 is arranged in the second layer of magnetic barrier grooves 12. The motor with the rotor structure can play a role in avoiding the heating of the rotor structure and the demagnetization of the magnetic steel. By adopting the rotor structure with the structure, the efficiency and the practicability of the motor are effectively improved.
Specifically, the second layer of magnetic barrier slots 12 includes a first constituent segment 121 and a second constituent segment 122, a first end of the first constituent segment 121 is disposed toward the shaft hole 13 side, a second end of the first constituent segment 121 is disposed to extend outward in the radial direction of the rotor core 10, a first end of the second constituent segment 122 is disposed toward the shaft hole 13 side, and the first end of the second constituent segment 122 is disposed with a distance from the first constituent segment 121, the first constituent segment 121 and the second constituent segment 122 are disposed symmetrically with respect to the intersecting axis or polar center line of the rotor core 10, the second end of the second constituent segment 122 is disposed to extend outward in the radial direction of the rotor core 10, one permanent magnet unit 20 is disposed in each of the first constituent segment 121 and the second constituent segment 122, alternatively, one of the first and second constituent segments 121 and 122 is provided with one permanent magnet unit 20, and the other of the first and second constituent segments 121 and 122 is provided with one nonmagnetic conductor unit 30. The magnetic circuit of the rotor core can be optimized by the arrangement, and the performance of the motor is effectively improved.
According to another embodiment of the present application, each of the barrier groove groups includes a first layer of barrier grooves 11 and a second layer of barrier grooves 12, the first layer of barrier grooves 11 is disposed near one side of the shaft hole 13 of the rotor core 10, the second layer of barrier grooves 12 is disposed outside the first layer of barrier grooves 11, at least one permanent magnet unit 20 is disposed in the first layer of barrier grooves 11, and at least one non-magnetic conductor unit 30 is disposed in the second layer of barrier grooves 12. This arrangement can also serve to provide the motor with an asynchronous starting function. When the motor is out of step due to overload, the motor can also asynchronously operate for a period of time in the mode of an induction motor, and the permanent magnet auxiliary reluctance motor with the structure has the function of out-of-step protection.
In this embodiment, the second layer of magnetic barrier slots 12 includes a first component 121 and a second component 122, a first end of the first component 121 is disposed toward the shaft hole 13, a second end of the first component 121 extends outward along the radial direction of the rotor core 10, a first end of the second component 122 is disposed toward the shaft hole 13, and a distance is provided between the first end of the second component 122 and the first component 121, the first component 121 and the second component 122 are symmetrically disposed about the intersecting axis of the rotor core 10, a second end of the second component 122 extends outward along the radial direction of the rotor core 10, and one non-magnetic conductor unit 30 is disposed in each of the first component 121 and the second component 122. By arranging the non-magnetic conductor units 30 in each component section, the motor has an asynchronous starting function, the efficiency of the motor can be effectively improved, the motor is protected, and the reliability of the motor is further improved.
Further, the first-layer barrier groove 11 includes a third constituent segment 111, a fourth constituent segment 112, and a fifth constituent segment 113 in this order. A first end of the third group segment 111 is disposed toward the shaft hole 13 side of the rotor core 10, a second end of the third group segment 111 extends along the radial direction of the rotor core 10, a first end of the fourth group segment 112 is disposed at a distance from the first end of the third group segment 111, a second end of the fourth group segment 112 is disposed away from the third group segment 111, a first end of the fifth group segment 113 is disposed at a distance from the second end of the fourth group segment 112, a second end of the fifth group segment 113 extends along the radial direction of the rotor core 10, the fifth group segment 113 is disposed opposite to the third group segment 111, and the third group segment 111, the fourth group segment 112, and the fifth group segment 113 are symmetrically disposed with respect to the intersecting axis of the rotor core 10. Wherein at least one of the third, fourth and fifth constituent segments 111, 112 and 113 is provided with one nonmagnetic conductor unit 30. The first layer of magnetic barrier grooves 11 are divided into three component sections, so that the processing difficulty of the rotor structure can be reduced, and meanwhile, the non-magnetic conductor units 30 or the permanent magnet units 20 can be conveniently arranged in each magnetic barrier groove component section of the first layer of magnetic barrier grooves.
Further, the distance between the first constituent segment 121 and the second constituent segment 122 is disposed to gradually increase outward in the radial direction of the rotor core 10. That is, a V-shaped structure is formed between the first constituent segment 121 and the second constituent segment 122, so that the arrangement can play a role of optimizing the magnetic path of the rotor core.
As shown in fig. 8 and 9, the rotor core 10 is further provided with a first through hole 14, the first through hole 14 is used for arranging a permanent magnet or a non-magnetic conductor, the first through hole 14 is located between the first layer of magnetic barrier grooves 11 and the second layer of magnetic barrier grooves 12, and the first through hole 14 is arranged near the first end of the first component section 121 and the first end of the second component section 122. Alternatively, as shown in fig. 11 and 12, the first through hole 14 is located outside the second layer barrier groove 12, and the first through hole 14 is provided near the first ends of the first and second constituent segments 121 and 122. The magnetic circuit of the rotor core can be optimized by the arrangement, so that the effect of reducing pulsation of the rotor core and improving the performance of the motor can be achieved. Compared with the existing punching sheet structure, the rotor punching sheet is structurally improved, the first through hole 14 is not used for rivet locking, plays a role of a magnetic isolation bridge, does not influence the electromagnetic performance, can improve the manufacturing process of the rotor punching sheet, and improves the precision of a rotor magnetic pole.
In order to further improve the performance of the motor, the rotor core 10 is further provided with a plurality of second through holes 15, the second through holes 15 are used for arranging permanent magnets or non-magnetic conductors, the plurality of second through holes 15 are arranged along the outer edge of the rotor core 10 at intervals, the plurality of second through holes 15 and the plurality of magnetic barrier slot groups are arranged in a one-to-one correspondence manner, the shapes of the cross sections of the first through holes 14 and the second through holes 15 are the same or different, and at least one of polygons, circles and ellipses is arranged on the cross sections of the first through holes 14 and the second through holes 15. The arrangement can also play a role in optimizing the magnetic circuit of the rotor core, thereby playing a role in reducing the pulsation of the rotor core and improving the performance of the motor.
Preferably, in each of the barrier groove groups, the quadrature axis of the rotor core 10 is disposed through the first through hole 14 and the second through hole 15.
In a particular embodiment of the present application, the set of barrier grooves includes at least two layers of barrier grooves. The nonmagnetic conductor unit 30 is made of copper or aluminum. When the motor operates synchronously, transient impact current of the rotor in various abnormal states can be guided and counteracted by the end baffle to return to zero, so that the risk of rotor heating and magnet steel demagnetization is reduced.
As shown in fig. 15 to 17, the rotor structure further includes two end baffles 40, the two end baffles 40 are respectively disposed at two ends of the rotor core 10 and connected to the nonmagnetic conductor unit 30, wherein the rotor core 10 includes a plurality of iron core laminations, and the plurality of iron core laminations are compressed by the end baffles 40 to form the rotor core 10. Through using end baffle 40 to compress tightly fixedly with the rotor core towards the piece, avoid adopting the mode of fixing rotor core towards the piece through the rivet among the prior art for the fold of rotor presses the coefficient height, and rotor length size uniformity is good, can reduce the rotor vortex, reduces the rotor and generates heat, improves motor efficiency, removes the rivet simultaneously, can reduce the additional loss of rotor, can reduce the effect that the rotor generated heat equally. The end stop 40 is made of the same material as or similar to the nonmagnetic conductor unit 30.
In the rotor structure, the number of poles of the rotor structure is P, where P is 2N and N is a positive integer greater than or equal to 1.
The rotor structure in the above-mentioned embodiment can also be used for electrical equipment technical field, promptly according to the utility model discloses a another aspect provides a permanent magnetism auxiliary reluctance motor of self-starting hybrid excitation, including rotor structure, rotor structure is the rotor structure in the above-mentioned embodiment. The reluctance motor with the rotor structure is analyzed according to the electromechanical principle and belongs to a semi-auxiliary magnetic mixed excitation reluctance motor; the permanent magnet and the nonmagnetic conductor can be freely combined to fill the magnetic barrier groove by analyzing from the engineering technology, so that the motor has different output characteristics to adapt to different motor working conditions. Due to the fact that different filling modes of the magnetic barrier grooves are adopted, a new rotor punching sheet does not need to be manufactured, the time for developing a new product can be greatly shortened, and the developing efficiency of the new product is improved.
Specifically, in the present application, the magnetic barrier slots of the existing reluctance motor rotor are partially filled with permanent magnets according to a certain rule, partially filled with metal nonmagnetic materials with good electrical conductivity, i.e., nonmagnetic conductor units, such as aluminum, copper, etc., and two ends of the rotor core are connected with short-circuit rings, i.e., end baffles (the short-circuit rings also serve as rotor baffles), so that a semi-auxiliary reluctance motor rotor with mixed excitation performance is formed.
As shown in fig. 10, the connecting portion of the bottom of the original V-shaped magnetic barrier groove is widened, and 1 trapezoidal hole, that is, the first through hole 14, is added, so that the magnetic barrier grooves of each layer have similar structures, and the punching manufacturability of the rotor sheet is better. Adopt the rotor structure in this application promptly, optimized rotor punching structure, improved the manufacturability of rotor punching for the manufacturability of rotor is better.
By adopting the rotor structure, the characteristics of large torque and low cost of the permanent magnet auxiliary reluctance motor (fully auxiliary magnet) are kept, and the self-starting performance and the out-of-step protection performance of the permanent magnet synchronous motor are improved. Meanwhile, the situation that the rotor is seriously heated, the permanent magnet is demagnetized and even the rotor is burnt down due to transient axial current of the rotor of the motor under the conditions that three-phase asymmetric operation of the motor occurs or the load is unbalanced can be avoided.
The design of compressing the rotor core punching sheet through the end baffle plate ensures that the laminating coefficient of the rotor is high, the axial size consistency is good, the rotor eddy current can be reduced, the heating of the rotor is reduced, and the motor efficiency is improved. And a rotor core fixing hole is eliminated, so that the additional loss of the rotor is reduced, and the heat generation of the rotor can be reduced.
In the application, a magnetic barrier groove of a reluctance motor is divided into two parts, one part is filled with a permanent magnet, the other part is filled with a metal nonmagnetic material, the metal nonmagnetic material with good conductivity forms an axial conductor in the magnetic barrier groove and is connected with an end baffle into a whole to form an end short-circuit ring, and transient current formed by a rotor in an abnormal operation state of the motor is guided to the short-circuit ring in a centralized manner (the rotor short-circuit ring is a three-phase star point, I is 0, and U is 0).
By adopting the technical means of the motor rotor structure, the self-starting (asynchronous starting) function and the step-out protection function are added by changing the rotor structure on the premise of not changing the original punching structure, and various rotor design schemes can be expanded under the condition of unchanging the punching structure, so that different output characteristics are provided, and different working condition requirements of the motor are matched. In the application, various punching sheet design schemes can be expanded, and more semi-auxiliary magnetic rotor schemes can be expanded through different filling modes.
By adopting the motor structure, the permanent magnet synchronous motor with the self-starting performance can be suitable for all reluctance motors, and the motor is more suitable for a permanent magnet auxiliary reluctance motor with a larger rotor diameter. Because the diameter of the rotor is large, the open reluctance slots are changed more, and the electromagnetic design scheme is more. Theoretically, the larger the number of reluctance slots in the radial direction, the larger the reluctance torque of the motor, and the more permanent magnets and nonmagnetic conductors are combined.
In the present application, there may be a plurality of arrangement modes of the magnetic barrier slots, for example, the magnetic barrier slots may be 2 slots, 3 slots per pole, or other numbers of multi-slot structures, and a combination of the permanent magnet and the metal nonmagnetic conductor may be selected according to actual needs (the permanent magnet synchronous motor is a non-standard design, and therefore the motor structure and the electromagnetic scheme need to be determined according to the motor working conditions). But the arrangement mode needs to satisfy the symmetrical distribution of the intersecting axes of the rotors. The motor can also be in a multi-pole arrangement structure of 2 poles, 4 poles, 6 poles, 8 poles … and the like.
In terms of technology, the metal non-magnetic conductor filling the magnetic barrier groove can be cast and molded (needs to be magnetized later) by adopting materials such as copper, aluminum and the like; or the formed copper bar can be inserted into the magnetic steel and then welded (or riveted) with the end baffle made of copper, and the magnetic steel can be magnetized firstly by the process. The process is similar to the manufacturing process of the squirrel-cage rotor of the asynchronous motor.
Because rotor core assembly body just constitutes a whole before the motor shaft is packed into, consequently, rotor core's overall structure nature is good, and structural strength is big. In addition, the inner hole of the rotor core assembly body can be ground firstly, and then the motor shaft is installed. Therefore, compared with the existing method, the method is simpler and more reasonable in the assembly process of the rotor assembly, better in effect and better in dynamic balance of the rotor. In practical application, different magnetic barrier groove filling modes and different rotor design schemes can be selected according to different working conditions of the motor.
The self-starting reluctance motor with the semi-auxiliary magnetic mixed excitation structure has the greatest characteristic in the motor principle, and compared with the existing non-auxiliary reluctance motor and the existing fully-auxiliary reluctance motor, the self-starting reluctance motor with the semi-auxiliary magnetic mixed excitation structure has completely different excitation modes. Structurally, under the condition that the structure of the rotor punching sheet is not changed, the excitation mode can be easily adjusted and changed through different combination modes of the permanent magnet and the non-magnetic conductor, so that the output characteristic of the motor is changed, and different motor working condition requirements are met. According to the existing rotor structure, the working condition of a common motor is changed, the rotor sheet needs to be redesigned, and a new stamping die needs to be manufactured again for the new rotor sheet, so that the development period can be prolonged, and the development cost can be increased.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
In addition to the foregoing, it should be noted that reference throughout this specification to "one embodiment," "another embodiment," "an embodiment," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment described generally throughout this application. The appearances of the same phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the scope of the invention to effect such feature, structure, or characteristic in connection with other embodiments.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (16)
1. A rotor structure of a self-starting hybrid excitation permanent magnet auxiliary reluctance motor is characterized by comprising:
the rotor comprises a rotor core (10), wherein a plurality of magnetic barrier groove groups are formed in the rotor core (10), the magnetic barrier groove groups are arranged at intervals along the circumferential direction of the rotor core (10), each magnetic barrier groove group comprises a plurality of layers of magnetic barrier grooves, at least one permanent magnet unit (20) is arranged in at least one layer of magnetic barrier groove in each magnetic barrier groove, and at least one nonmagnetic conductor unit (30) is arranged in the other layer of magnetic barrier groove in each magnetic barrier groove.
2. The rotor structure according to claim 1, wherein each of the barrier groove groups comprises a first layer of barrier grooves (11) and a second layer of barrier grooves (12), the first layer of barrier grooves (11) is disposed near one side of the shaft hole (13) of the rotor core (10), the second layer of barrier grooves (12) is disposed outside the first layer of barrier grooves (11), at least one of the non-magnetic conductor units (30) is disposed in the first layer of barrier grooves (11), and at least one of the permanent magnet units (20) is disposed in the second layer of barrier grooves (12).
3. The rotor structure according to claim 2, wherein the second layer of the magnetic barrier slots (12) includes a first constituent segment (121) and a second constituent segment (122), a first end of the first constituent segment (121) is disposed toward the side of the shaft hole (13), a second end of the first constituent segment (121) is disposed to extend outward in a radial direction of the rotor core (10), a first end of the second constituent segment (122) is disposed toward the side of the shaft hole (13), and a first end of the second constituent segment (122) is disposed with a distance from the first constituent segment (121), the first constituent segment (121) and the second constituent segment (122) are disposed symmetrically with respect to an intersecting axis of the rotor core (10), a second end of the second constituent segment (122) is disposed to extend outward in the radial direction of the rotor core (10), one permanent magnet unit (20) is arranged in each of the first constituent segment (121) and the second constituent segment (122), or one permanent magnet unit (20) is arranged in one of the first constituent segment (121) and the second constituent segment (122), and one nonmagnetic conductor unit (30) is arranged in the other one of the first constituent segment (121) and the second constituent segment (122).
4. The rotor structure according to claim 1, wherein each of the barrier groove groups comprises a first layer of barrier grooves (11) and a second layer of barrier grooves (12), the first layer of barrier grooves (11) is disposed near one side of the shaft hole (13) of the rotor core (10), the second layer of barrier grooves (12) is disposed outside the first layer of barrier grooves (11), at least one of the permanent magnet units (20) is disposed in the first layer of barrier grooves (11), and at least one of the non-magnetic conductor units (30) is disposed in the second layer of barrier grooves (12).
5. The rotor structure according to claim 4, wherein the second layer of the magnetic barrier slots (12) includes a first constituent segment (121) and a second constituent segment (122), a first end of the first constituent segment (121) is disposed toward the side of the shaft hole (13), a second end of the first constituent segment (121) is disposed to extend outward in a radial direction of the rotor core (10), a first end of the second constituent segment (122) is disposed toward the side of the shaft hole (13), and a first end of the second constituent segment (122) is disposed with a distance from the first constituent segment (121), the first constituent segment (121) and the second constituent segment (122) are disposed symmetrically with respect to an intersecting axis of the rotor core (10), a second end of the second constituent segment (122) is disposed to extend outward in the radial direction of the rotor core (10), one nonmagnetic conductor unit (30) is provided in each of the first constituent segment (121) and the second constituent segment (122).
6. The rotor structure according to claim 2 or 3, wherein the first layer of magnetic barrier slots (11) includes a third group of segments (111), a fourth group of segments (112), and a fifth group of segments (113) in this order, a first end of the third group of segments (111) is disposed toward the shaft hole (13) side of the rotor core (10), a second end of the third group of segments (111) is disposed to extend in a radial direction of the rotor core (10), a first end of the fourth group of segments (112) is disposed to have a distance from a first end of the third group of segments (111), a second end of the fourth group of segments (112) is disposed to have a distance from the third group of segments (111), a first end of the fifth group of segments (113) is disposed to have a distance from a second end of the fourth group of segments (112), a second end of the fifth group of segments (113) is disposed to extend in a radial direction of the rotor core (10), the fifth component section (113) is arranged opposite to the third component section (111), and the third component section (111), the fourth component section (112) and the fifth component section (113) are arranged symmetrically with respect to a quadrature axis of the rotor core (10);
wherein at least one of the third, fourth and fifth constituent segments (111, 112, 113) is provided with one of the nonmagnetic conductor units (30).
7. The rotor structure according to claim 3 or 5, characterized in that the distance between the first constituent segment (121) and the second constituent segment (122) is gradually increased outwardly in a radial direction of the rotor core (10).
8. The rotor structure according to claim 3 or 5, wherein the rotor core (10) further defines a first through hole (14), the first through hole (14) is used for disposing a permanent magnet or a non-magnetic conductor, the first through hole (14) is located between the first layer of magnetic barrier grooves (11) and the second layer of magnetic barrier grooves (12), and the first through hole (14) is disposed near the first end of the first component section (121) and the first end of the second component section (122), or the first through hole (14) is located outside the second layer of magnetic barrier grooves (12), and the first through hole (14) is disposed near the first end of the first component section (121) and the first end of the second component section (122).
9. The rotor structure according to claim 8, wherein the rotor core (10) further defines a plurality of second through holes (15), the second through holes (15) are used for disposing permanent magnets or non-magnetic conductors, the plurality of second through holes (15) are disposed along the outer edge of the rotor core (10) at intervals, the plurality of second through holes (15) are disposed in one-to-one correspondence with the plurality of magnetic barrier slot groups, the cross sections of the first through holes (14) and the second through holes (15) have the same or different shapes, and the cross sections of the first through holes (14) and the second through holes (15) have at least one of polygonal shapes, circular shapes and elliptical shapes.
10. A rotor structure according to claim 9, characterized in that in each of the groups of barrier slots, the cross-axis of the rotor core (10) is arranged through the first through-hole (14) and the second through-hole (15).
11. The rotor structure of claim 1, wherein the set of barrier slots comprises at least two layers of barrier slots.
12. The rotor structure according to claim 1, characterized in that the non-magnetic conductor unit (30) is made of copper or aluminum.
13. The rotor structure of claim 1, further comprising:
the rotor core structure comprises end baffles (40), the number of the end baffles (40) is two, the two end baffles (40) are respectively arranged at two ends of the rotor core (10) and connected with the non-magnetic conductor units (30), the rotor core (10) comprises a plurality of iron core stamped sheets, and the iron core stamped sheets are pressed by the end baffles (40) to form the rotor core (10).
14. The rotor structure according to claim 1, wherein the number of poles of the rotor structure is P, where P ═ 2N, and N is a positive integer greater than or equal to 1.
15. The rotor structure according to claim 13, characterized in that the end shield (40) is made of the same material as the non-magnetic conductor unit (30).
16. A self-starting hybrid-excited permanent magnet-assisted reluctance machine comprising a rotor structure, characterized in that the rotor structure is as claimed in any one of claims 1 to 15.
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| CN202021196988.0U CN212850014U (en) | 2020-06-24 | 2020-06-24 | Rotor structure of self-starting hybrid excitation permanent magnet auxiliary reluctance motor and motor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114094737A (en) * | 2021-11-16 | 2022-02-25 | 珠海格力电器股份有限公司 | Self-starting permanent magnet auxiliary synchronous reluctance motor rotor and motor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114094737A (en) * | 2021-11-16 | 2022-02-25 | 珠海格力电器股份有限公司 | Self-starting permanent magnet auxiliary synchronous reluctance motor rotor and motor |
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