CN112671133A - Rotor structure and motor - Google Patents
Rotor structure and motor Download PDFInfo
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- CN112671133A CN112671133A CN202011497428.3A CN202011497428A CN112671133A CN 112671133 A CN112671133 A CN 112671133A CN 202011497428 A CN202011497428 A CN 202011497428A CN 112671133 A CN112671133 A CN 112671133A
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- 238000004080 punching Methods 0.000 claims abstract description 41
- 230000004888 barrier function Effects 0.000 claims description 37
- 239000000463 material Substances 0.000 claims description 7
- 230000005415 magnetization Effects 0.000 claims description 6
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 claims description 4
- 229910001172 neodymium magnet Inorganic materials 0.000 claims description 4
- 230000004907 flux Effects 0.000 description 13
- 230000001360 synchronised effect Effects 0.000 description 10
- 230000000149 penetrating effect Effects 0.000 description 5
- 241000555745 Sciuridae Species 0.000 description 2
- 230000005347 demagnetization Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000012811 non-conductive material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
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- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Synchronous Machinery (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The invention provides a rotor structure and a motor, wherein the rotor structure comprises a plurality of rotor punching sheets which are sequentially overlapped, each rotor punching sheet is provided with a shaft hole for a rotating shaft to pass through, the rotor punching sheets are provided with a plurality of slit grooves and a plurality of filling grooves, and the rotor structure further comprises: and the permanent magnets penetrate through the rotor punching sheets and are parallel to the intersecting axes of the rotor punching sheets. The rotor structure of the invention solves the problem of low efficiency of the motor in the prior art.
Description
Technical Field
The invention relates to the field of motors, in particular to a rotor structure and a motor.
Background
The self-starting synchronous reluctance motor combines the advantages of an asynchronous motor on the basis of the synchronous reluctance motor, realizes self-starting through asynchronous torque generated by a rotor conducting bar, does not need to be driven by a frequency converter, reduces the loss of a motor system, and improves the motor efficiency. Compared with an asynchronous motor, the motor has low rotor loss and high motor efficiency under the constant-speed operation; compared with an asynchronous starting permanent magnet synchronous motor, the permanent magnet synchronous motor does not use permanent magnet materials, is low in cost and does not have the problem of demagnetization of permanent magnets.
In the conventional synchronous induction motor capable of self-starting, at least a pair of slit portions and a plurality of slit portions arranged on the outer peripheral side of the slit portions are provided in a rotor. However, the slit part is in a linear shape, the center of the rotor is provided with the shaft hole, and the inner space of the rotor is large, so that the utilization rate of the space of the rotor is low, the inner space of the rotor is not well utilized to increase the salient pole ratio of the motor, the torque output capacity of the motor is low, and the efficiency of the motor is low.
Disclosure of Invention
The invention mainly aims to provide a rotor structure and a motor, and aims to solve the problem that the motor in the prior art is low in efficiency.
In order to achieve the above object, according to an aspect of the present invention, there is provided a rotor structure, the rotor structure includes a plurality of rotor sheets stacked in sequence, each of the rotor sheets is provided with a shaft hole for a rotating shaft to pass through, the rotor sheet is provided with a plurality of slit grooves and a plurality of filling grooves, and the rotor structure further includes: and the permanent magnets penetrate through the rotor punching sheets and are parallel to the intersecting axes of the rotor punching sheets.
Further, the permanent magnet is a plurality of, and a plurality of permanent magnets are arranged along the direction of the straight axis of the rotor structure.
Furthermore, at least one permanent magnet is arranged on two opposite sides of the shaft hole; and/or the permanent magnet is arranged on one side of the shaft hole.
Furthermore, the rotor structure is a two-pole structure consisting of two rotor poles; and/or the direction of magnetization of the permanent magnets is the same as the direction of the straight axis of the rotor structure.
Further, the rotor structure still includes the pivot of wearing to establish in the shaft hole, and the pivot is the magnetic conduction axle.
Further, the radial depth L1 of the permanent magnet has a value range of:
wherein, the radial depth L1 of the permanent magnet is from the permanent magnet to the rotor punching sheet along the radial direction of the rotor punching sheetR is the radius of the rotor sheet.
Further, the minimum distance L2 between the permanent magnet and the shaft hole has a value range of: l2 is more than or equal to sigma and less than or equal to 5 sigma; wherein σ is the width of the air gap between the inner diameter of the stator and the outer diameter of the rotor of the motor formed by the rotor structure.
Further, the value range of the length L of the permanent magnet on the rotor sheet is as follows: l is more than or equal to 0.6D and less than or equal to D; wherein D is the diameter of the shaft hole.
Further, the value range of the thickness h of the permanent magnet in the magnetization direction is as follows: h is more than or equal to 4 sigma and less than or equal to 8.5 sigma; wherein σ is the width of the air gap between the inner diameter of the stator and the outer diameter of the rotor of the motor formed by the rotor structure.
Furthermore, the permanent magnet is made of neodymium iron boron.
Furthermore, the plurality of slit grooves and the plurality of filling grooves jointly form a multilayer magnetic barrier structure, the filling grooves and the slit grooves in each magnetic barrier structure are arranged at intervals, and the value range of the interval width L3 is more than or equal to 0.8 sigma and less than or equal to L3 and less than or equal to 2 sigma; wherein σ is the width of the air gap between the inner diameter of the stator and the outer diameter of the rotor of the motor formed by the rotor structure.
Further, the plurality of slit grooves and the plurality of filling grooves jointly constitute a multilayer magnetic barrier structure, and in the same magnetic barrier structure, the difference between the maximum width of the filling groove and the maximum width of the slit groove is within 10% of the width of the slit groove.
Further, the plurality of slit grooves and the plurality of filling grooves jointly form a multilayer magnetic barrier structure, and the distance L5 between two adjacent magnetic barrier structures is larger than 1.8h 1; wherein h1 is the minimum width of the slit groove of the magnetic barrier structure with the smaller dimension in the direction of the intersecting axis in two adjacent magnetic barrier structures.
Further, the filling groove is positioned on the inner side of the outer periphery of the rotor sheet, or the notch of the filling groove extends to the outer periphery of the rotor sheet; and/or the distance L4 between each filling groove and the outer periphery of the rotor punching sheet is larger than sigma; wherein σ is the width of the air gap between the inner diameter of the stator and the outer diameter of the rotor of the motor formed by the rotor structure.
Further, the plurality of filling grooves comprise first independent filling grooves which are arranged in pairs along the direct axis direction of the rotor structure and second independent filling grooves which are arranged in pairs along the quadrature axis direction of the rotor punching; the shape of the first independent filling groove is different from that of the second independent filling groove, and/or the area of the first independent filling groove on the rotor sheet is different from that of the second independent filling groove on the rotor sheet.
Furthermore, the first independent filling grooves and the second independent filling grooves are both in multiple groups, the multiple groups of first independent filling grooves are distributed along the quadrature axis direction of the rotor punching sheet, and the multiple groups of second independent filling grooves are distributed along the direct axis direction of the rotor structure.
Furthermore, the filling groove is filled with a filling part, and the material of the filling part is the same as that of the end rings at the two ends of the rotor structure.
According to another aspect of the present invention, there is provided an electric machine comprising a stator and a rotor, the rotor being of the above-described rotor structure.
By applying the technical scheme, the rotor structure is a rotor structure of a self-starting synchronous reluctance motor, the rotor structure is formed by overlapping rotor punching sheets with a specific structure, a plurality of slit grooves, a plurality of filling grooves and shaft holes are formed in the rotor punching sheets, permanent magnets are further arranged on the rotor structure in a penetrating mode, and particularly, the extending direction of the permanent magnets on the rotor punching sheets is parallel to the intersecting axis of the rotor structure. According to the invention, the permanent magnet is placed at the special position on the rotor structure, the direct-axis flux linkage of the motor with the rotor structure is increased, the salient pole difference of the motor is increased, the torque output capability of the motor is improved, the power factor of the motor is increased, and the problem of lower efficiency of the motor in the prior art is solved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, 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 a schematic structural view of a first embodiment of a rotor structure according to the invention;
fig. 2 shows a schematic structural view of a first embodiment of a rotor sheet in a rotor structure according to the invention;
fig. 3 shows a schematic structural view of a second embodiment of a rotor sheet in a rotor structure according to the invention; and
fig. 4 shows a graph of output torque versus time for a motor having a rotor structure of the present invention and a motor having a rotor structure of the prior art.
Wherein the figures include the following reference numerals:
100. rotor punching sheets; 11. a slit groove; 12. filling the groove; 121. a first independent fill slot; 122. a second independent fill slot; 20. a shaft hole; 3. a straight shaft; 4. intersecting axes; 200. an end ring; 300. and a permanent magnet.
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 embodiments with reference to the attached drawings.
As shown in fig. 1 to 3, the present invention provides a rotor structure, the rotor structure includes a plurality of rotor sheets 100 stacked in sequence, each rotor sheet 100 is provided with a shaft hole 20 for a rotating shaft to pass through, the rotor sheet 100 is provided with a plurality of slot grooves 11 and a plurality of filling grooves 12, and the rotor structure further includes: the permanent magnets 300 are arranged on the plurality of rotor punching sheets 100 in a penetrating mode, and the permanent magnets 300 are parallel to the intersecting axis 4 of the rotor punching sheets 100.
The rotor structure of the invention is a rotor structure of a self-starting synchronous reluctance motor, the rotor structure is formed by overlapping rotor punching sheets 100 with a specific structure, a plurality of slit grooves 11, a plurality of filling grooves 12 and a shaft hole 20 are formed on the rotor punching sheets 100, permanent magnets 300 are also arranged on the rotor structure in a penetrating way, and particularly, the extending direction of the permanent magnets 300 on the rotor punching sheets 100 is parallel to a crossing shaft 4 of the rotor structure. According to the invention, the permanent magnet 300 is placed at a special position on the rotor structure, so that the direct-axis flux linkage of the motor with the rotor structure is increased, the salient pole difference of the motor is increased, the torque output capability of the motor is improved, the power factor of the motor is increased, and the problem of low efficiency of the motor in the prior art is solved.
In the self-starting synchronous reluctance motor, the magnetic field direction of a rotor is a straight shaft 3, also called a d shaft, and an orthogonal shaft 4 and the straight shaft 3 have a 90-degree electrical angle difference, also called a q shaft.
Preferably, the permanent magnet 300 is plural, and the plural permanent magnets 300 are arranged in the direction of the straight shaft 3 of the rotor structure.
Optionally, at least one permanent magnet 300 is disposed on each of two opposite sides of the shaft hole 20; and/or the permanent magnet 300 is disposed at one side of the shaft hole 20.
Specifically, the plurality of permanent magnets 300 are sequentially arranged at intervals in the direction of the straight axis 3 of the rotor structure, and each of the plurality of permanent magnets 300 extends in the direction of the quadrature axis 4. When the number of the permanent magnets 300 is multiple, the multiple permanent magnets 300 are respectively positioned at two opposite sides of the shaft hole 20 along the direction of the straight shaft 3 of the rotor structure; alternatively, when there are one or more permanent magnets 300, each permanent magnet 300 is located on one side of the shaft hole 20 in the direction of the straight shaft 3 of the rotor structure.
Thus, flux linkage generated by the permanent magnet 300 on the straight shaft 3 flows into the air gap through the magnetic channel between the rotor punching sheet 100, the magnetic motor rotating shaft and the filling groove 12, and the straight shaft flux linkage of the motor is increased. In addition, the provision of the permanent magnet 300 may also increase the power factor of the motor.
In the embodiment shown in fig. 2, the rotor structure is a two-pole structure consisting of two rotor poles; and/or the direction of magnetization of the permanent magnets 300 is the same as the direction of the straight axis 3 of the rotor structure.
The rotor structure of the invention has two rotor poles, in each rotor pole, the narrow slot 11 and the filling slot 12 are smoothly connected to form a magnetic barrier structure of the rotor pole, wherein a gap is reserved between the filling slot 12 and the narrow slot 11 in each layer of magnetic barrier structure.
The magnetic barriers are magnetic flux barriers and are structures for blocking magnetic lines of force from passing through, a magnetic channel is formed between two adjacent magnetic flux barriers in the same rotor pole, and each magnetic flux barrier is formed by filling hollow air grooves or other non-magnetic materials in the grooves.
The magnetizing direction is the magnetizing direction of the magnet, and the magnetic material can be magnetized to be saturated along the magnetizing direction.
The magnetizing direction of the permanent magnet 300 is the same as the direction of the straight shaft 3, and the permanent magnets 300 located at opposite sides of the rotating shaft have the same magnetizing direction. Thus, the flux linkage generated by the permanent magnet 300 can increase the direct-axis flux linkage of the motor and increase the salient pole difference of the motor, and the salient pole difference is the d-axis inductance L of the motor as shown in the following formuladAnd q-axis inductance LqThe difference, the larger salient pole difference can improve the torque output capability of the motor. In addition, the provision of the permanent magnet 300 may also increase the power factor of the motor.
In the formula, TemIs electromagnetic torque, p is the number of pole pairs of the motor, LdD-axis inductance and L of motorqFor q-axis inductance of the machine, isIs stator current, idFor d-axis current, i, of the motorqIs the motor q-axis current and beta is the current angle.
Specifically, the rotor structure further includes a rotating shaft penetrating through the shaft hole 20, and the rotating shaft is a magnetic conduction shaft.
The rotating shaft matched with the shaft hole 20 in the rotor structure is a magnetic conduction shaft, the magnetic conduction rotating shaft is used as a part of a straight shaft magnetic circuit and provides a path for the circulation of straight shaft magnetic chains, the rotating shaft is a magnetic conduction shaft, and the magnetic chains generated by the permanent magnets 300 circulate through the magnetic channels among the rotor punching sheets 100, the rotating shaft and the filling grooves 12 and enter air gaps.
Specifically, the radial depth L1 of the permanent magnet 300 has a value range of:
the radial depth L1 of the permanent magnet 300 is a distance from the permanent magnet 300 to the outer periphery of the rotor sheet 100 along the radial direction of the rotor sheet 100, and R is a radius of the rotor sheet 100.
The radial depth of the permanent magnet 300 is L1, which is the distance between the outer circumferential surface of the rotor sheet 100 close to the permanent magnet 300 and the end surface of the permanent magnet 300 far from the shaft hole 20 along the direction of the straight shaft 3, and L1 is satisfied
R is the radius of the rotor plate 100, also called the rotor depth. If the radial depth of the permanent magnet 300 is too large, the strength of the connecting rib at the joint of the permanent magnet 300 and the rotating shaft cannot be ensured, and if the radial depth of the permanent magnet 300 is too small, the utilization rate of the flux linkage of the permanent magnet 300 is too low, and the area of the first independent filling groove 121 in the direction of the straight shaft 3 is too small, which reduces the starting capability of the motor.
Specifically, the minimum distance L2 between the permanent magnet 300 and the shaft hole 20 has a value range of: l2 is more than or equal to sigma and less than or equal to 5 sigma; wherein σ is the width of the air gap between the inner diameter of the stator and the outer diameter of the rotor of the motor formed by the rotor structure.
The minimum distance L2 between the permanent magnet 300 and the rotating shaft is the minimum distance between the shaft hole 20 and the end surface of the permanent magnet 300 close to the shaft hole 20, and L2 satisfies the condition that σ is not less than L2 not more than 5 σ, and σ is the width of the air gap between the inner diameter of the stator and the outer diameter of the rotor of the motor with the rotor structure of the invention. The purpose of this is to maximize the use of the flux linkage generated by the permanent magnets 300 while preserving sufficient space to arrange a certain area of the first independent filling slot 121 to enhance the on-load starting capability of the motor, while ensuring the mechanical strength of the rotor structure.
As shown in fig. 2, the length L of the permanent magnet 300 on the rotor sheet 100 has the following range: l is more than or equal to 0.6D and less than or equal to D; where D is the diameter of the axial bore 20.
The permanent magnet 300 is in a strip shape, the permanent magnet 300 extends along the direction of the intersecting axis 4, the length of the permanent magnet 300 is L, L is more than or equal to 0.6D and less than or equal to L and less than or equal to D, preferably, L is more than or equal to 0.7D and less than or equal to L and less than or equal to 0.9D, and D is the diameter of the shaft hole 20. Therefore, under the condition of ensuring the salient pole difference of the motor to be increased, the direct-axis magnetic circuit formed by the permanent magnet 300, the rotor core, the magnetic conduction shaft and the like is fully utilized, the direct-axis flux linkage of the motor is increased, the uniform magnetic density saturation of the rotor core part can be ensured, the magnetic resistance of the magnetic circuit is reduced, and the motor efficiency is improved.
Specifically, the thickness h of the permanent magnet 300 in the magnetization direction has a value range of: h is more than or equal to 4 sigma and less than or equal to 8.5 sigma; wherein σ is the width of the air gap between the inner diameter of the stator and the outer diameter of the rotor of the motor formed by the rotor structure.
The thickness h of the magnetization direction of the permanent magnet 300, which means the dimension of the permanent magnet 300 in the direction of the straight axis, should satisfy 4 σ ≦ h ≦ 8.5 σ, preferably, h should satisfy 5 σ ≦ h ≦ 7 σ, further preferably, h should satisfy 5.2 σ ≦ h ≦ 5.4 σ, σ being the width of the air gap between the inner diameter of the stator and the outer diameter of the rotor of the motor having the rotor structure. In this way, the permanent magnet 300 can be ensured to have a sufficient margin of demagnetization resistance.
Optionally, the permanent magnet 300 is made of neodymium iron boron. The permanent magnet 300 is made of neodymium iron boron or other rare earth materials.
Specifically, a plurality of slit grooves 11 and a plurality of filling grooves 12 jointly form a multilayer magnetic barrier structure, the filling grooves 12 and the slit grooves 11 in each magnetic barrier structure are arranged at intervals, and the value range of the interval width L3 is 0.8 sigma or more and L3 or more and 2 sigma or less; wherein σ is the width of the air gap between the inner diameter of the stator and the outer diameter of the rotor of the motor formed by the rotor structure.
Preferably, the plurality of slit grooves 11 and the plurality of filling grooves 12 together constitute a multilayer magnetic barrier structure, and in the same magnetic barrier structure, the difference between the maximum width of the filling groove 12 and the maximum width of the slit groove 11 is within 10% of the width of the slit groove 11.
The slit grooves 11 and the filling grooves 12 jointly form a multilayer magnetic barrier structure of a rotor structure, wherein a certain interval is reserved between the filling grooves 12 and the slit grooves 11 in each magnetic barrier structure, the interval width L3 refers to the minimum distance between the adjacent filling grooves 12 and the slit grooves 11 in the same magnetic barrier structure, L3 meets the condition that 0.8 sigma is more than or equal to L3 is more than or equal to 2 sigma, and sigma is the width of an air gap between the inner diameter of a stator and the outer diameter of the rotor of a motor with the rotor structure; meanwhile, the filling groove 12 and the slit groove 11 in each layer of magnetic barrier structure are smoothly connected, and the difference value between the width of the filling groove 12 and the width of the slit groove 11 is within 10% of the width of the slit groove 11. Set up like this and can guarantee rotor structure's mechanical strength on the one hand, reduce the magnetic leakage between filling groove 12 and the slit groove 11, on the other hand can control the width between filling groove 12 and the slit groove 11 to it is smooth and easy to make rotor structure's magnetic circuit passageway, reduces rotor structure's magnetic resistance of magnetic circuit.
Preferably, the plurality of slit grooves 11 and the plurality of filling grooves 12 jointly form a multilayer magnetic barrier structure, and the distance L5 between two adjacent magnetic barrier structures is greater than 1.8h 1; where h1 is the minimum width of the slit groove 11 of the smaller size of the two adjacent magnetic barrier structures in the direction of the intersecting axis 4.
The distance L5 between two adjacent layers of magnetic barrier structures refers to the minimum interval between the slit grooves 11 of the two adjacent layers of magnetic barrier structures, L5 is greater than 1.8h1, wherein h1 is the minimum dimension of the magnetic barrier structure with the smaller dimension in the direction of the intersecting axis 4 in the two adjacent layers of magnetic barrier structures. Therefore, on one hand, the processing difficulty of the rotor structure can be reduced, on the other hand, the uniformity of the magnetic density distribution of the rotor structure can be ensured, and the saturation of the magnetic density of the rotor structure is reduced.
Optionally, the filling groove 12 is located inside the outer periphery of the rotor sheet 100, or a notch of the filling groove 12 extends to the outer periphery of the rotor sheet 100; and/or the distance L4 between each filling groove 12 and the outer periphery of the rotor sheet 100 is greater than σ; wherein σ is the width of the air gap between the inner diameter of the stator and the outer diameter of the rotor of the motor formed by the rotor structure.
The filling slots 12 are open slots or closed slots filled with an electrically conductive but magnetically non-conductive material, and the distance L4 between the filling slots 12 and the outer periphery of the rotor should be larger than σ, which is the width of the air gap between the inner diameter of the stator and the outer diameter of the rotor of an electrical machine having a rotor structure of the present invention, in view of the strength of the rotor structure and the influence of magnetic leakage.
Specifically, the plurality of filling grooves 12 include first independent filling grooves 121 arranged in pairs along a direction of a straight axis 3 of the rotor structure and second independent filling grooves 122 arranged in pairs along a direction of a quadrature axis 4 of the rotor sheet 100; the shape of the first independent filling groove 121 is different from that of the second independent filling groove 122, and/or the area of the first independent filling groove 121 on the rotor sheet 100 is different from that of the second independent filling groove 122 on the rotor sheet 100.
Preferably, the first independent filling grooves 121 and the second independent filling grooves 122 are both provided in multiple groups, the multiple groups of first independent filling grooves 121 are distributed along the quadrature axis 4 direction of the rotor sheet 100, and the multiple groups of second independent filling grooves 122 are distributed along the direct axis 3 direction of the rotor structure.
In the embodiment shown in fig. 2, two groups of first independent filling grooves 121 are disposed on the rotor sheet 100, the two groups of first independent filling grooves 121 are symmetrical with respect to the quadrature axis 4 of the rotor structure, each group of first independent filling grooves 121 includes two first independent filling grooves 121, and the two first independent filling grooves 121 are symmetrical with respect to the direct axis 3 of the rotor structure; two groups of second independent filling grooves 122 are arranged on the rotor punching sheet 100, the two groups of second independent filling grooves 122 are symmetrically arranged about a straight shaft 3 of the rotor structure, each group of second independent filling grooves 122 comprises four second independent filling grooves 122, and the four second independent filling grooves 122 are symmetrically arranged about a quadrature axis 4 of the rotor structure in pairs.
In the embodiment shown in fig. 3, two groups of first independent filling grooves 121 are provided on the rotor sheet 100, the two groups of first independent filling grooves 121 are symmetrically arranged about the quadrature axis 4 of the rotor structure, each group of first independent filling grooves 121 includes one first independent filling groove 121, and the first independent filling groove 121 extends along the direction of the direct axis 3 of the rotor structure; two groups of second independent filling grooves 122 are arranged on the rotor punching sheet 100, the two groups of second independent filling grooves 122 are symmetrically arranged about a straight shaft 3 of the rotor structure, each group of second independent filling grooves 122 comprises four second independent filling grooves 122, and the four second independent filling grooves 122 are symmetrically arranged about a quadrature axis 4 of the rotor structure in pairs.
In this way, by providing the first independent filling groove 121 and the second independent filling groove 122, the starting torque of the motor can be increased, which helps to enhance the self-starting capability of the motor.
Specifically, the filling groove 12 is filled with a filling portion of the same material as that of the end rings 200 at both ends of the rotor structure.
As shown in fig. 1, the rotor structure of the present invention includes a rotor sheet 100 having a specific structure, an end ring 200, and a permanent magnet 300, and the rotor sheet 100 is provided with a slit groove 11, a filling groove 12, and a shaft hole 20 engaged with a rotating shaft of a motor.
The filling grooves 12 and the filling materials therein are self-short-circuited through end rings 200 at both ends of the rotor structure to form a squirrel cage structure, the material of the end rings 200 is the same as that of the filling grooves 12, and the self-short-circuited squirrel cage structure can provide asynchronous torque in the starting stage of the motor so as to realize self-starting of the self-starting synchronous reluctance motor.
The invention also provides a motor which comprises a stator and a rotor, wherein the rotor is of the rotor structure.
As shown in fig. 4, in the comparison graph of the output torque of the motor having the rotor structure of the present invention and the output torque of the motor having the rotor structure of the related art with time, it can be seen that the output torque of the motor having the rotor structure of the present invention is greatly improved compared to the motor having the rotor structure of the related art.
In both embodiments of the rotor structure provided by the present invention, the permanent magnet 300 may be located at one side or opposite sides of the rotating shaft of the motor; the slit groove 11 may have an extended shape like a straight line or a curved line; the shape of the filling groove 12 may be trapezoidal or other shapes, which do not affect the technical effect of the technical solution of the present invention.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:
the rotor structure of the invention is a rotor structure of a self-starting synchronous reluctance motor, the rotor structure is formed by overlapping rotor punching sheets 100 with a specific structure, a plurality of slit grooves 11, a plurality of filling grooves 12 and a shaft hole 20 are formed on the rotor punching sheets 100, permanent magnets 300 are also arranged on the rotor structure in a penetrating way, and particularly, the extending direction of the permanent magnets 300 on the rotor punching sheets 100 is parallel to a crossing shaft 4 of the rotor structure. According to the invention, the permanent magnet 300 is placed at a special position on the rotor structure, so that the direct-axis flux linkage of the motor with the rotor structure is increased, the salient pole difference of the motor is increased, the torque output capability of the motor is improved, the power factor of the motor is increased, and the problem of low efficiency of the motor in the prior art is solved.
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 (18)
1. The utility model provides a rotor structure, rotor structure includes a plurality of rotor punching (100) of superpose in proper order, each be provided with shaft hole (20) that are used for supplying the pivot to pass on the rotor punching (100), a plurality of slot grooves (11) and a plurality of filling groove (12) have been seted up on rotor punching (100), its characterized in that, rotor structure still includes:
the permanent magnet (300) penetrates through the rotor punching sheets (100), and the permanent magnet (300) is parallel to a cross shaft (4) of the rotor punching sheets (100).
2. The rotor structure according to claim 1, characterized in that the permanent magnet (300) is in plurality, the plurality of permanent magnets (300) being arranged in the direction of the straight axis (3) of the rotor structure.
3. The rotor structure of claim 1,
at least one permanent magnet (300) is arranged on each of two opposite sides of the shaft hole (20); and/or
The permanent magnet (300) is arranged on one side of the shaft hole (20).
4. The rotor structure of claim 1,
the rotor structure is a two-pole structure consisting of two rotor poles; and/or
The magnetizing direction of the permanent magnet (300) is the same as the direction of the straight shaft (3) of the rotor structure.
5. The rotor structure according to claim 1, further comprising a rotating shaft inserted into the shaft hole (20), wherein the rotating shaft is a magnetic shaft.
6. The rotor structure of claim 1,
the radial depth L1 of the permanent magnet (300) has the following value range:
the radial depth L1 of the permanent magnet (300) is the distance from the permanent magnet (300) to the outer periphery of the rotor punching sheet (100) along the radial direction of the rotor punching sheet (100), and R is the radius of the rotor punching sheet (100).
7. The rotor structure of claim 1,
the minimum distance L2 between the permanent magnet (300) and the shaft hole (20) has the value range as follows: l2 is more than or equal to sigma and less than or equal to 5 sigma;
wherein σ is the width of the air gap between the inner diameter of the stator and the outer diameter of the rotor of the motor formed by the rotor structure.
8. The rotor structure of claim 1,
the length L of the permanent magnet (300) on the rotor punching sheet (100) is in the range as follows: l is more than or equal to 0.6D and less than or equal to D;
wherein D is the diameter of the shaft hole (20).
9. The rotor structure of claim 1,
the thickness h of the permanent magnet (300) in the magnetization direction has the value range: h is more than or equal to 4 sigma and less than or equal to 8.5 sigma;
wherein σ is the width of the air gap between the inner diameter of the stator and the outer diameter of the rotor of the motor formed by the rotor structure.
10. The rotor structure according to claim 1, characterized in that the permanent magnet (300) is made of neodymium iron boron.
11. The rotor structure according to claim 1, characterized in that a plurality of the slit grooves (11) and a plurality of the filling grooves (12) jointly constitute a multilayer magnetic barrier structure, the filling grooves (12) and the slit grooves (11) in each magnetic barrier structure are arranged at intervals, and the interval width L3 is in a value range of 0.8 sigma to L3 to 2 sigma; wherein σ is the width of the air gap between the inner diameter of the stator and the outer diameter of the rotor of the motor formed by the rotor structure.
12. A rotor structure according to claim 1, characterized in that a plurality of said slit grooves (11) and a plurality of said filling grooves (12) together constitute a multilayer magnetic barrier structure, and in the same magnetic barrier structure, the difference between the maximum width of said filling groove (12) and the maximum width of said slit groove (11) is within 10% of the width of the slit groove (11).
13. The rotor structure according to claim 1, characterized in that a plurality of the slit grooves (11) and a plurality of the filling grooves (12) together constitute a multilayer magnetic barrier structure, and a distance L5 between two adjacent magnetic barrier structures is larger than 1.8h 1; h1 is the minimum width of the slit groove (11) of the magnetic barrier structure with the smaller size in the direction of the quadrature axis (4) in two adjacent magnetic barrier structures.
14. The rotor structure of claim 1,
the filling groove (12) is positioned on the inner side of the outer periphery of the rotor punching sheet (100), or the notch of the filling groove (12) extends to the outer periphery of the rotor punching sheet (100); and/or
The distance L4 between each filling groove (12) and the outer periphery of the rotor punching sheet (100) is larger than sigma; wherein σ is the width of the air gap between the inner diameter of the stator and the outer diameter of the rotor of the motor formed by the rotor structure.
15. The rotor structure of claim 1,
the filling grooves (12) comprise first independent filling grooves (121) which are arranged in pairs along the direction of a straight shaft (3) of the rotor structure and second independent filling grooves (122) which are arranged in pairs along the direction of a quadrature shaft (4) of the rotor punching sheet (100);
the shape of the first independent filling groove (121) is different from that of the second independent filling groove (122), and/or the area occupied by the first independent filling groove (121) on the rotor sheet (100) is different from that occupied by the second independent filling groove (122) on the rotor sheet (100).
16. The rotor structure according to claim 15, wherein the first and second independent filling grooves (121, 122) are each a plurality of groups, the first groups of independent filling grooves (121) are distributed along a direction of a quadrature axis (4) of the rotor sheet (100), and the second groups of independent filling grooves (122) are distributed along a direction of a direct axis (3) of the rotor structure.
17. A rotor structure according to claim 1, characterized in that the filling groove (12) is filled with a filling portion of the same material as the end rings (200) at both ends of the rotor structure.
18. An electrical machine comprising a stator and a rotor, wherein the rotor is a rotor structure as claimed in any one of claims 1 to 17.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114123581A (en) * | 2021-11-16 | 2022-03-01 | 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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