CN217445098U - Oriented silicon steel sheet rotor core and synchronous reluctance motor - Google Patents
Oriented silicon steel sheet rotor core and synchronous reluctance motor Download PDFInfo
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- CN217445098U CN217445098U CN202221467572.7U CN202221467572U CN217445098U CN 217445098 U CN217445098 U CN 217445098U CN 202221467572 U CN202221467572 U CN 202221467572U CN 217445098 U CN217445098 U CN 217445098U
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Abstract
The utility model discloses an orientation silicon steel sheet rotor core and synchronous reluctance motor, this rotor core are assembled by the orientation silicon steel sheet subassembly that a plurality of structures are the same and are formed, and the rolling direction of the inside orientation silicon steel sheet of every subassembly all is on a parallel with rotor core d axle, and full play orientation silicon steel sheet is at the strong advantage of rolling direction magnetic conductivity for d axle magnetic resistance reduces, and the inductance increases, has further improved synchronous reluctance motor's salient pole difference and salient pole rate, makes the torque density and the power factor of motor have obtained the promotion, provide useful exploration for synchronous reluctance motor's research. Furthermore, the utility model discloses synchronous reluctance machine production and processing is convenient, to having complicated magnetic barrier shape and the more rotor core of magnetic barrier layer number, only needs to press the oriented silicon steel sheet into the same oriented silicon steel sheet subassembly of a plurality of structures, accomplish after the suppression the combination assemble can, avoided the difficult problem of preparation of integration rotor core.
Description
Technical Field
The utility model belongs to the technical field of synchronous reluctance motor, concretely relates to orientation silicon steel sheet rotor core and synchronous reluctance motor.
Background
In recent years, as the reserves of high-performance rare earth permanent magnet materials are gradually reduced and the price is continuously increased, the demand for motors with higher performance and lower cost is rapidly increasing, and the research on electromagnetic devices with less rare earth permanent magnet materials, such as reluctance motors, is becoming more and more important. The synchronous reluctance motor can operate without the aid of permanent magnet excitation, and can generate reluctance torque by using the inductance difference between the d axis and the q axis according to the principle of minimum reluctance. The speed-regulating device has the advantages of low price, simple processing, reliable structure, wide speed-regulating range and the like, and is widely applied to the fields of compressors, household appliances, electric automobiles, agricultural production and the like.
The synchronous reluctance motor generates reluctance torque proportional to a difference in inductance between d and q axes (hereinafter referred to as saliency difference) by using a reluctance minimum principle, the d axis being a low reluctance direction and the q axis being a high reluctance direction, which are different by 90 degrees in electrical angle. The traditional rotor core of the synchronous reluctance motor is prepared from non-oriented silicon steel sheets, a plurality of layers of magnetic barriers are punched on the rotor core, and the difference of salient poles has a certain limit, so that the reluctance torque is difficult to increase after reaching a certain value, the problem that the output torque is difficult to further improve under the condition of load increase can occur, and the problem that how to improve the torque performance of the synchronous reluctance motor becomes a hotspot of research is solved. In the existing research, some design methods are provided for improving the reluctance torque of a synchronous reluctance motor, and for a transverse laminated rotor, the occupancy rate of a magnetic barrier, the number of layers of the magnetic barrier and the shape of the magnetic barrier are optimized and analyzed, so that the structure of the motor rotor is changed, and the number of layers of an axial magnetic barrier is increased for the axial laminated rotor. The methods mainly improve salient pole difference of the motor from the aspects of magnetic barrier occupancy rate, magnetic barrier structure, topology optimization and the like, and when saturation occurs in the motor, reluctance torque is difficult to further increase. The permanent magnet magnetic assisting type synchronous reluctance motor is characterized in that a permanent magnet structure is added into a magnetic barrier of a rotor of the synchronous reluctance motor, permanent magnet torque is generated, so that the output torque of the motor is increased, a salient pole difference is not obviously increased, the cost of the motor is high, the permanent magnet has a demagnetization risk, and the running stability of the motor is reduced. In the design of modern synchronous reluctance machines, higher efficiency, torque density and compactness are achieved by using high quality anisotropic magnetic materials. For example, a Rotor Core of a Motor is made of a cold-rolled Grain-Oriented silicon steel sheet material (Taghavi, S.and P.Pillay, A Novel gain-Oriented excitation Rotor Core Assembly for a Synchronous emission conduction Motor With a Reduced Torque Ripple Algorithm. IEEE Transactions on Industry Applications,2016.52(0): p.3729-3738.), the salient pole difference can be increased, the Torque density of the Motor can be improved, but the rolling direction of the Oriented silicon steel sheet of the structure is strictly vertical to the q axis of the Rotor Core, and the structure cannot fully exert the advantage of high magnetic permeability of the Oriented silicon steel sheet in the rolling direction through analysis of the magnetic flux path of the Motor.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an orientation silicon steel sheet rotor core and synchronous reluctance machine to solve the technical problems existing in the background technology, and the orientation silicon steel sheet material is applied to improve the magnetic conductivity of the d-axis magnetic field of the synchronous reluctance machine and improve the output torque; in order to solve the problem that the traditional integrated rotor core is difficult to produce and manufacture when the shape of the magnetic barrier is complex and the number of the magnetic barrier layers is large, the motor rotor core is formed by assembling a plurality of oriented silicon steel sheet assemblies with the same structure, large-scale processing and manufacturing are facilitated, the rolling direction of each oriented silicon steel sheet assembly is parallel to the d axis of the rotor core, and the salient pole difference of the synchronous reluctance motor is effectively increased by utilizing the characteristics of good magnetic conductivity and high magnetic conductivity of the oriented silicon steel sheets in the rolling direction, so that the output torque of the synchronous reluctance motor is improved.
In order to achieve the purpose, the utility model adopts the following technical scheme: the rotor core is characterized in that the rotor core is a hollow cylinder structure formed by splicing and bonding even number of oriented silicon steel sheet assemblies with the same structure and the same rolling direction, wherein the number of the oriented silicon steel sheet assemblies is not less than 2, and a through hole in the center of the cylinder structure is a motor rotating shaft mounting hole; each oriented silicon steel sheet assembly is formed by aligning, laminating and fastening a plurality of same oriented silicon steel sheets along the axial direction of a motor rotating shaft, two adjacent oriented silicon steel sheets are fixed together in a bonding mode, and the rolling direction of each oriented silicon steel sheet is the same;
the rolling direction of the oriented silicon steel sheet is consistent with the d-axis direction of the rotor core, namely the low magnetic resistance direction at the setting position; two groups of magnetic barrier structures are symmetrically arranged on two sides of the oriented silicon steel sheet; the size of the magnetic barriers in each group of magnetic barrier structures is sequentially reduced from inside to outside, and the periphery of each magnetic barrier is sealed by the periphery of the oriented silicon steel sheet; each magnetic barrier comprises an outer groove parallel to the d-axis direction and an inner groove vertical to the q-axis direction, the top of the outer groove is an arc line segment, two side edges of the outer groove are parallel to the d-axis direction, and the bottom of the outer groove is connected with the top of the inner groove; two side edges of the internal groove are vertical to the direction of the q axis, and the bottom of the internal groove is parallel to the direction of the q axis; the tops of the external grooves of all the magnetic barriers on the plurality of oriented silicon steel sheets of the rotor core, which are positioned on the same radial plane, are positioned on the same circumference, and the central axis of the circumference is superposed with the central axis of the rotor core; the edge lines, which are closest to two adjacent oriented silicon steel sheets of the plurality of oriented silicon steel sheets on the same radial plane, are parallel to the q-axis direction, and the bottom of the inner groove on the oriented silicon steel sheet has a certain distance with the edge line closest to the bottom of the inner groove, so that the mechanical strength of the motor is improved; the magnetic barrier is empty or filled with non-magnetic conductive materials.
Further, the utility model provides an orientation silicon steel sheet rotor core synchronous reluctance motor, its characterized in that, this synchronous reluctance motor includes rotor core as above, still includes stator core, armature winding, motor shaft, stator core adopts non-orientation silicon steel sheet material, and it is laminated and fastened along the axial by the same state by a plurality of the same annular non-orientation silicon steel sheets that inside evenly was provided with tooth portion; the armature winding is a three-phase symmetrical distributed winding and is arranged in a slit groove formed by a tooth part and a yoke part inside the stator core; the axial lengths of the stator core and the rotor core are the same, a circle of air gap is reserved between the stator core and the rotor core, and the width of the air gap is between 0.2mm and 1 mm; during assembly, the axis of the rotor core and the axis of the stator core coincide with the axis of the motor rotating shaft.
Compared with the prior art, the beneficial effects of the utility model reside in that:
1. the utility model discloses rotor core is assembled by the orientation silicon steel sheet subassembly that a plurality of structures are the same and is formed, and the rolling direction of the inside orientation silicon steel sheet of every subassembly all is on a parallel with rotor core d axle, and full play orientation silicon steel sheet is at the strong advantage of rolling direction magnetic conductivity for d axle magnetic resistance reduces, and the inductance increases, has further improved synchronous reluctance machine's salient pole difference and salient pole rate, makes the torque density and the power factor of motor have obtained the promotion, provide useful exploration for synchronous reluctance machine's research.
2. The production and processing are convenient, for the rotor core with a complex magnetic barrier shape and a large number of magnetic barrier layers, only the oriented silicon steel sheets are required to be pressed into a plurality of oriented silicon steel sheet assemblies with the same structure, and the assembly can be carried out after the pressing is finished, so that the problem that the integrated rotor core is difficult to manufacture is avoided.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of an oriented silicon steel sheet rotor core according to the present invention;
fig. 2 is a schematic structural view of an oriented silicon steel sheet assembly according to an embodiment of the present invention (arrows in the figure indicate rolling directions);
fig. 3 is a schematic structural view of an embodiment of the synchronous reluctance motor with the rotor core made of oriented silicon steel sheets according to the present invention;
fig. 4 is a schematic structural diagram of a conventional U-shaped synchronous reluctance motor (a rotor core 7 is prepared from non-oriented silicon steel sheets);
FIG. 5 shows d-axis inductance (L) of the synchronous reluctance motor in embodiment 1 d of SynRMa), q-axis inductance (L) q of SynRMa) and d-axis inductance (L) of conventional U-shaped synchronous reluctance motor d of SynRMb), q-axis powerFeeling (L) q of SynRMb) comparative plot with increasing current density;
FIG. 6 is a graph showing a comparison between the salience ratio of SynRMa and the Power factor of a synchronous reluctance motor in example 1 and the salience ratio of SynRMb and the Power factor of a conventional U-type synchronous reluctance motor with increasing current density;
FIG. 7 is a schematic diagram showing a torque comparison between a synchronous reluctance machine (SynRMa) of example 1 and a conventional U-type synchronous reluctance machine (SynRMb) under the same applied conditions;
fig. 8 is a magnetic flux distribution diagram of the synchronous reluctance motor in embodiment 1 in actual operation;
description of the drawings: 1. a stator core; 2. an armature winding; 3. an air gap; 4. an oriented silicon steel sheet; 5. a magnetic barrier; 6. a motor shaft; 7. rotor core (of a conventional U-shaped synchronous reluctance machine).
Detailed Description
The technical solution of the present invention is described clearly and completely with reference to the accompanying drawings and the detailed description, and the protection scope of the present invention is not limited thereby.
The utility model provides an oriented silicon steel sheet rotor core, which is characterized in that the rotor core is a hollow cylinder structure formed by splicing and bonding an even number of oriented silicon steel sheet assemblies with the same structure and the same rolling direction, wherein the number of the oriented silicon steel sheet assemblies is not less than 2, and a through hole at the center of the cylinder structure is a motor rotating shaft mounting hole; each oriented silicon steel sheet assembly is formed by aligning, laminating and fastening a plurality of same oriented silicon steel sheets along the axial direction of the motor rotating shaft, two adjacent oriented silicon steel sheets are fixed together in a bonding mode, and the rolling direction of each oriented silicon steel sheet is the same.
The rolling direction of the oriented silicon steel sheet is consistent with the d-axis direction of the rotor core, namely the direction of low magnetic resistance at the setting position. Two groups of magnetic barrier structures are symmetrically arranged on two sides of the oriented silicon steel sheet; the size of the magnetic barriers in each group of magnetic barrier structures is sequentially reduced from inside to outside (one side close to the symmetrical axis of the oriented silicon steel sheet is taken as the inside), and the periphery of each magnetic barrier is sealed by the periphery of the oriented silicon steel sheet; each magnetic barrier comprises an outer groove parallel to the d-axis direction and an inner groove vertical to the q-axis direction, the top of the outer groove is an arc line segment, two side edges of the outer groove are parallel to the d-axis direction, and the bottom of the outer groove is connected with the top of the inner groove; two side edges of the internal groove are vertical to the direction of the q axis, and the bottom of the internal groove is parallel to the direction of the q axis; the tops of the external grooves of all the magnetic barriers on the plurality of oriented silicon steel sheets of the rotor core, which are positioned on the same radial plane, are positioned on the same circumference, and the central axis of the circumference is superposed with the central axis of the rotor core; the edge lines, which are closest to two adjacent oriented silicon steel sheets of the plurality of oriented silicon steel sheets on the same radial plane, are parallel to the q-axis direction, and the bottom of the inner groove on the oriented silicon steel sheet has a certain distance with the edge line closest to the bottom of the inner groove, so that the mechanical strength of the motor is improved; the magnetic barrier is empty or filled with non-magnetic conductive materials.
On the premise that the mechanical strength of the rotor core allows, the number of poles (namely the number of the oriented silicon steel sheet assembly structures) in the rotor, the number of layers, the shape and the size of the magnetic barriers in the oriented silicon steel sheets can be adjusted as required.
Further, the utility model provides an orientation silicon steel sheet rotor core synchronous reluctance motor, its characterized in that, this synchronous reluctance motor includes rotor core as above, still includes stator core, armature winding, motor shaft, stator core adopts non-orientation silicon steel sheet material, and it is laminated and fastened along the axial by the same state by a plurality of the same annular non-orientation silicon steel sheets that inside evenly was provided with tooth portion; the armature winding is a three-phase symmetrical distributed winding and is arranged in a slit groove formed by a tooth part and a yoke part inside the stator core; the axial length of the stator core is the same as that of the rotor core, a circle of air gap is reserved between the stator core and the rotor core, and the width of the air gap is 0.2mm to 1 mm. During assembly, the axis of the rotor core and the axis of the stator core coincide with the axis of the motor rotating shaft.
The synchronous reluctance motor is obtained by replacing the traditional rotor core of the U-shaped synchronous reluctance motor with the oriented silicon steel sheet rotor core of the utility model.
The utility model discloses synchronous reluctance motor's innovation point lies in rotor core structure, and traditional synchronous reluctance motor rotor core is laminated by non-oriented silicon steel sheet and is pressed and form, and the motor anti saturation capacity is poor, therefore its torque density has obtained the restriction. And the utility model discloses synchronous reluctance motor's rotor core is assembled by rolling direction and the same oriented silicon steel sheet subassembly of a plurality of structures of rotor core's d axle direction looks unanimity and forms, is convenient for large-scale manufacturing and can the one-way magnetic conduction advantage of full play oriented silicon steel sheet, can reduce d axle magnetic resistance in the at utmost, increases the salient pole difference of motor, and then can effectual promotion motor's output torque to motor size and weight have been reduced under the same work load.
Example 1
The embodiment provides an oriented silicon steel sheet rotor core (see fig. 1-2), which is characterized in that the rotor core is a hollow cylinder structure formed by splicing and bonding four oriented silicon steel sheet assemblies with the same structure and the same rolling direction, and a through hole in the center of the cylinder structure is a motor rotating shaft mounting hole; each oriented silicon steel sheet assembly is formed by aligning, laminating and fastening a plurality of same oriented silicon steel sheets 4 along the axial direction of the motor rotating shaft, two adjacent oriented silicon steel sheets 4 are fixed together in a bonding mode, and the rolling direction of each oriented silicon steel sheet 4 is the same.
The rolling direction of the oriented silicon steel sheet 4 is consistent with the d-axis direction of the rotor core, namely the low reluctance direction at the setting position. Two groups of magnetic barrier structures 5 are symmetrically arranged on two sides of the oriented silicon steel sheet; the sizes of the three magnetic barriers in each group of magnetic barrier structures are sequentially reduced from inside to outside (one side close to the symmetrical axis of the oriented silicon steel sheet is taken as the inside), and the periphery of each magnetic barrier is sealed by the periphery of the oriented silicon steel sheet; each magnetic barrier comprises an outer groove parallel to the d-axis direction and an inner groove vertical to the q-axis direction, the top of the outer groove is an arc line segment, two side edges of the outer groove are parallel to the d-axis direction, and the bottom of the outer groove is connected with the top of the inner groove; two side edges of the internal groove are vertical to the q-axis direction, and the bottom of the internal groove is parallel to the q-axis direction; the tops of the external grooves of all the magnetic barriers on the plurality of oriented silicon steel sheets of the rotor core, which are positioned on the same radial plane, are positioned on the same circumference, and the central axis of the circumference is superposed with the central axis of the rotor core; the edge lines, which are closest to two adjacent oriented silicon steel sheets, of the oriented silicon steel sheets on the same radial plane are parallel to the q-axis direction, and the distance between the bottom of the inner groove on each oriented silicon steel sheet and the edge line closest to the bottom of the inner groove is 0.3mm, so that the mechanical strength of the motor is improved; the magnetic barrier is empty or filled with non-magnetic conductive materials.
Further, the utility model provides an orientation silicon steel sheet rotor core synchronous reluctance machine (refer to fig. 3), its characterized in that, this synchronous reluctance machine includes as above rotor core, still includes stator core 1, armature winding 2, motor shaft 6, stator core 1 adopts non-orientation silicon steel sheet material, and it is laminated and fastened along the axial by the same state by a plurality of the same annular non-orientation silicon steel sheets that inside evenly is provided with tooth portion; the armature winding 2 is a three-phase symmetrical distributed winding and is arranged in a slit groove formed by a tooth part and a yoke part inside the stator core 1; the axial length of the stator core 1 is the same as that of the rotor core, a circle of air gap 3 is reserved between the stator core and the rotor core, and the width of the air gap 3 is 0.5 mm. During the assembly, the axle center of rotor core, the axle center of stator core 1 and the axle center coincidence of motor shaft 6, rotor core suit and fixed mounting are on motor shaft 6, and stator core 1 is fixed on the motor base through the installation accessory.
The parameters of the synchronous reluctance machine of the present embodiment are shown in table 1.
TABLE 1 synchronous reluctance machine construction parameters
The synchronous reluctance motor in the embodiment is subjected to simulation modeling, and an electromagnetic field finite element module Maxwell 2D is used for performing transient field modeling and simulation analysis on the synchronous reluctance motor with the oriented silicon steel sheet assembly, wherein a motor model is shown as fig. 3 (SynRMa).
As shown in fig. 1, the rotor core of the motor in this embodiment is a cylinder structure formed by assembling four oriented silicon steel sheet assemblies with the same structure, and the arrow direction in the figure represents the rolling direction of the oriented silicon steel sheet assemblies, and the direction of the arrow is consistent with the d-axis direction of the rotor core, that is, the low reluctance direction. As shown in fig. 2, each of the oriented silicon steel sheet assemblies is formed by laminating and fastening a plurality of same oriented silicon steel sheets in the same state along the axial direction, two sets of magnetic barrier structures are symmetrically arranged on two sides of each layer of oriented silicon steel sheet, magnetic barriers are vacant or filled with non-magnetic-conductive materials, and arrows in the figure point to the rolling direction of the oriented silicon steel sheets, so that d-axis inductance can be effectively increased, q-axis inductance is reduced, salient pole difference of the motor is obviously improved, and output torque of the motor is improved.
Fig. 4 shows a conventional U-shaped synchronous reluctance machine (SynRMb), in which the stator core structure and the armature winding are the same as those of the synchronous reluctance machine of this embodiment, the rotor structure includes a rotor core 7, a magnetic barrier structure 5 is disposed on the rotor core 7, the rotor core 7 is formed by laminating non-oriented silicon steel sheets, each magnetic barrier structure 5 of the non-oriented silicon steel sheets contains three layers of magnetic barriers, and the magnetic barriers are approximately U-shaped.
FIG. 5 shows d-axis inductance (L) of the synchronous reluctance motor in this embodiment d of SynRMa), q-axis inductance (L) q of SynRMa) and d-axis inductance (L) of conventional U-type synchronous reluctance machines d of SynRMb), q-axis inductance (L) q of SynRMb) comparison of the current density variations, it can be seen that the d-axis inductance (L) of the two machines d ) Decreases sharply with increasing current density and the decrease is first rapid and then slow, since at a current density of 4A/mm 2 When the silicon steel sheet in the motor is just positioned near the knee point of the B-H curve, the rotor magnetic conduction bridge is saturated along with the increase of the current density, so that the magnetic resistance is greatly increased, and L is L d Rapidly decreases, the silicon steel sheet in the motor reaches serious saturation when the current density continues to increase, the magnetic resistance increase amplitude is smaller, and therefore L is obtained at the moment d The slow rate is reduced; q-axis inductance (L) q ) The reduction amplitude is smaller as the current density is increased, because the quadrature axis magnetic resistance is the magnetic resistance of the non-magnetic conductive material, and the value is greatly insensitive to the current change. It is evident from the comparison in the figure that the motor of the present example exhibits a higher d-axis inductance and a lower q-axis inductance at the same operating point. This is because when the current is flowingWhen the density is larger, the saturation resistance of the oriented silicon steel sheet is strong, and the magnetic force lines can still smoothly circulate through the oriented silicon steel sheet, so that the d-axis magnetic resistance is smaller, namely the d-axis inductance is higher. Therefore, the use of oriented silicon steel sheets in the rotor core increases the salient pole difference of the motor, increases the output torque, and reduces the size of the motor under the same working load.
FIG. 6 is a schematic diagram showing the comparison between the salience ratio of SynRMa and the Power factor of the synchronous reluctance motor in this embodiment and the salience ratio of SynRMb and the Power factor of the conventional U-type synchronous reluctance motor, which are defined as L, and the Saliency is changed with the current density d And L q Is measured in the measurement. It can be seen from the figure that the salient pole ratio of the motor of the example is higher, because the motor of the example adopts the oriented silicon steel sheet material, so that the L is higher d Greater tendency of change of saliency and L with increasing current density d Are substantially the same. Since the power factor is positively correlated with the saliency, the motor of the present embodiment has a higher power factor.
Fig. 7 is a schematic diagram showing the comparison of the output torque of the synchronous reluctance motor (SynRMa) of the present embodiment with the output torque of the conventional U-shaped synchronous reluctance motor (SynRMb) under the same applied conditions, and it is apparent from the diagram that the synchronous reluctance motor of the present embodiment has a higher output torque than the conventional U-shaped synchronous reluctance motor. This is because the adoption oriented silicon steel material has effectively increased d axle inductance, has improved the salient pole difference of motor to increase motor output torque, proved the utility model discloses technical scheme's feasibility.
Fig. 8 shows a magnetic flux distribution pattern of the synchronous reluctance motor of the present embodiment when actually operated. It can be seen from the figure that the motor has more magnetic lines of force in the d-axis direction of the rotor core, because the rolling direction of the oriented silicon steel sheet is parallel to the d-axis of the rotor core, the magnetic resistance in the d-axis direction is very small, and more magnetic lines of force can easily pass through according to the principle of minimum magnetic resistance.
The utility model discloses rotor core is assembled by rolling direction and the same oriented silicon steel sheet subassembly of a plurality of structures that rotor core d axle is unanimous and is formed, utilizes the characteristics that oriented silicon steel sheet rolling direction magnetic conductivity is high, magnetic conductivity is strong, has effectively improved the salient pole difference and the salient pole rate of motor, and then has promoted the torque density and the power factor of motor, has improved the electromagnetic properties of motor.
Although the invention has been described in connection with specific embodiments thereof, it will be understood that the invention is capable of further modifications. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains and as may be applied to the essential features hereinbefore set forth.
As the present invention may be embodied in several forms without departing from the spirit of the essential characteristics of the invention, it should also be understood that the above-described embodiments are not intended to limit the present invention unless otherwise specified, but rather should be construed broadly within its spirit and scope as defined in the appended claims. The described embodiments are to be considered in all respects only as illustrative and not restrictive.
The utility model discloses the nothing is mentioned the part and is applicable to prior art.
Claims (6)
1. The rotor core is characterized in that the rotor core is a hollow cylinder structure formed by splicing and bonding even number of oriented silicon steel sheet assemblies with the same structure and the same rolling direction, wherein the number of the oriented silicon steel sheet assemblies is not less than 2, and a through hole in the center of the cylinder structure is a motor rotating shaft mounting hole; each oriented silicon steel sheet assembly is formed by aligning, laminating and fastening a plurality of same oriented silicon steel sheets along the axial direction of the motor rotating shaft, two adjacent oriented silicon steel sheets are fixed together in a bonding mode, and the rolling directions of the oriented silicon steel sheets are the same;
the rolling direction of the oriented silicon steel sheet is consistent with the d-axis direction of the rotor core, namely the low magnetic resistance direction at the setting position; two groups of magnetic barrier structures are symmetrically arranged on two sides of the oriented silicon steel sheet; the size of the magnetic barriers in each group of magnetic barrier structures is sequentially reduced from inside to outside, and the periphery of each magnetic barrier is sealed by the periphery of the oriented silicon steel sheet; each magnetic barrier comprises an outer groove parallel to the d-axis direction and an inner groove vertical to the q-axis direction, the top of the outer groove is an arc line segment, two side edges of the outer groove are parallel to the d-axis direction, and the bottom of the outer groove is connected with the top of the inner groove; two side edges of the internal groove are vertical to the direction of the q axis, and the bottom of the internal groove is parallel to the direction of the q axis; the tops of the external grooves of all the magnetic barriers on the plurality of oriented silicon steel sheets of the rotor core, which are positioned on the same radial plane, are positioned on the same circumference, and the central axis of the circumference is superposed with the central axis of the rotor core; edge lines, closest to the two adjacent oriented silicon steel sheets, of the oriented silicon steel sheets on the same radial plane are parallel to the q-axis direction, and the bottoms of the inner grooves in the oriented silicon steel sheets are away from the edge lines closest to the bottom of the inner grooves in a certain distance, so that the mechanical strength of the motor is improved; the magnetic barrier is empty or filled with non-magnetic conductive materials.
2. The rotor core of claim 1, wherein the rotor core is formed by assembling and bonding four pieces of oriented silicon steel having the same structure and the same rolling direction.
3. The rotor core of oriented silicon steel sheet according to claim 1, wherein each set of magnetic barrier structures on the oriented silicon steel sheet comprises three magnetic barriers.
4. The rotor core of grain-oriented silicon steel sheet according to claim 1, wherein the distance from the bottom of the inner slot of the grain-oriented silicon steel sheet to the nearest edge line is 0.3 mm.
5. The synchronous reluctance motor is characterized by comprising the rotor core as claimed in any one of claims 1 to 4, a stator core, an armature winding and a motor rotating shaft, wherein the stator core is made of non-oriented silicon steel sheet materials and is formed by axially laminating and fastening a plurality of same annular non-oriented silicon steel sheets with teeth uniformly arranged inside in the same state; the armature winding is a three-phase symmetrical distributed winding and is arranged in a slit groove formed by a tooth part and a yoke part inside the stator core; the axial lengths of the stator core and the rotor core are the same, a circle of air gap is reserved between the stator core and the rotor core, and the width of the air gap is between 0.2mm and 1 mm; during assembly, the axis of the rotor core and the axis of the stator core are superposed with the axis of the motor rotating shaft; the synchronous reluctance motor is obtained by replacing a rotor core of a conventional U-shaped synchronous reluctance motor with an oriented silicon steel sheet rotor core according to any one of claims 1 to 4.
6. The synchronous reluctance motor with the oriented silicon steel sheet rotor core according to claim 5, wherein the width of the air gap is 0.5 mm.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CZ309876B6 (en) * | 2022-11-17 | 2024-01-03 | Vysoké Učení Technické V Brně | A method of production of a rotor of a synchronous reluctance motor and a rotor of a synchronous reluctance motor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CZ309876B6 (en) * | 2022-11-17 | 2024-01-03 | Vysoké Učení Technické V Brně | A method of production of a rotor of a synchronous reluctance motor and a rotor of a synchronous reluctance motor |
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