CN214756133U - Irregular magnetic flux barrier synchronous reluctance motor - Google Patents
Irregular magnetic flux barrier synchronous reluctance motor Download PDFInfo
- Publication number
- CN214756133U CN214756133U CN202121296562.7U CN202121296562U CN214756133U CN 214756133 U CN214756133 U CN 214756133U CN 202121296562 U CN202121296562 U CN 202121296562U CN 214756133 U CN214756133 U CN 214756133U
- Authority
- CN
- China
- Prior art keywords
- magnetic flux
- flux barrier
- boundary
- rotor
- irregular
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Synchronous Machinery (AREA)
Abstract
The utility model relates to an irregular magnetic flux barrier synchronous reluctance motor, which comprises a rotor core, a magnetic flux barrier, a stator core and an armature winding; a plurality of layers of magnetic flux barriers are distributed under each rotor pole of the rotor core along the radial direction of the motor, a magnetic conduction bridge is formed between two adjacent layers of magnetic flux barriers under the same rotor pole, the magnetic flux barriers and the magnetic conduction bridge under the same rotor pole are alternately combined, the shape of each layer of magnetic flux barriers is symmetrical left and right, and the upper boundary and the lower boundary of each layer of magnetic flux barriers are not parallel; each boundary is in an irregular shape and is formed by sequentially connecting a plurality of line segments with different lengths and irregular positions, and each boundary is converged from an end point to the middle part in sequence towards the direction of the intersection point of the q axis and the boundary. In the process of running of the motor, the quadrature axis inductance is reduced and the direct axis inductance is increased under the action of the irregular magnetic barrier shape and the irregular magnetic conduction bridge shape, so that the difference value between the quadrature axis inductance is increased, and the electromagnetic torque of the motor is increased.
Description
Technical Field
The utility model belongs to the technical field of synchronous reluctance motor, concretely relates to synchronous reluctance motor of irregular magnetic flux barrier.
Background
The synchronous reluctance motor is essentially a synchronous motor with reluctance torque characteristics, and can be widely applied to the aspects of compressors, rail transit, electric automobiles, textile equipment and the like as a substitute motor of the permanent magnet synchronous motor due to the excellent performances of simple structure, wide speed regulation range and the like and no permanent magnet on a rotor. However, in the working process of the synchronous reluctance motor, the magnetic flux is closed along the minimum path of the magnetic resistance, a d-axis inductance difference value and a q-axis inductance difference value are formed by alternately combining a plurality of layers of magnetic flux barriers and magnetic conduction bridges in the rotor, the d-axis and q-axis inductance difference values are utilized to generate reluctance torque, and the reluctance change of the salient pole rotor can cause torque pulsation, so that the synchronous reluctance motor has large torque pulsation and can influence the running performance of the motor.
The upper and lower boundaries of each layer of magnetic flux barrier of the traditional synchronous reluctance motor rotor are parallel straight lines or are in an arc structure with uniform equal width, and the magnetic flux barriers and the magnetic conduction bridges in regular shapes are formed.
In the existing research, torque pulsation is mainly suppressed by designing rotor structures with gradually changed insulation magnetic flux barriers or asymmetric magnetic flux barriers, but the rotor structures reduce the torque pulsation and the average output torque, so that the running performance of the motor is reduced.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is to provide an irregular magnetic flux barrier synchronous reluctance motor.
The utility model provides a technical scheme that technical problem adopted is:
an irregular magnetic flux barrier synchronous reluctance motor is characterized by comprising a rotor core, a magnetic flux barrier, a stator core and an armature winding; j layers of magnetic flux barriers are distributed below each rotor pole of the rotor core along the radial direction of the motor, a magnetic conduction bridge is formed between two adjacent layers of magnetic flux barriers below the same rotor pole, the magnetic flux barriers and the magnetic conduction bridge below the same rotor pole are alternately combined, the shape of each layer of magnetic flux barriers is symmetrical left and right, and the upper boundary and the lower boundary of each layer of magnetic flux barriers are not parallel; each boundary is in an irregular shape and is formed by sequentially connecting a plurality of line segments with different lengths and irregular positions, and each boundary is converged from an end point to the middle part in sequence towards the direction of the intersection point of the q axis and the boundary.
The coordinates of each point on the lower boundary of the right half part of the jth layer of magnetic flux barrier are as follows:
wherein the content of the first and second substances,
the distance from the nth point on the lower boundary of the right half part of the jth layer of magnetic flux barrier to the pole center of the rotor and the included angle between the nth point and the y axis are respectively;
the coordinates of each point on the upper boundary of the right half of the jth layer of flux barrier are:
wherein the content of the first and second substances,
the distance from the nth point on the upper boundary of the right half part of the jth layer of magnetic flux barrier to the pole center of the rotor and the included angle between the nth point and the y axis are respectively;
compared with the prior art, the beneficial effects of the utility model reside in that:
what is different with traditional synchronous reluctance motor rotor structure, the utility model discloses an upper and lower two border nonparallels of every layer of magnetic flux protective screen of synchronous reluctance motor, every border is irregularly shaped to connect by many line segments and constitute, the length and the position of line segment are irregular. The length and the position of the line segment do not have any structural parameter meaning, and are determined according to the position of an interpolation point determined by optimizing parameter set parameters, the shape of the irregular magnetic barrier enables the shape of the magnetic barrier and the shape of the magnetic conduction bridge to be irregular at the same time, during the operation process of the motor, the quadrature axis inductance is reduced, the direct axis inductance is increased, the difference value between the quadrature axis inductance is increased, and the electromagnetic torque of the motor is increased under the action of the irregular magnetic barrier shape and the irregular magnetic conduction bridge shape. Meanwhile, reluctance torque fluctuation generated by using the difference value of the d-axis inductance and the q-axis inductance becomes small, so that the torque ripple of the motor is reduced, and the torque performance of the motor is improved under the rotor shape.
Drawings
Fig. 1 is a radial sectional view of a synchronous reluctance motor of the present invention;
fig. 2 is a schematic perspective view of a synchronous reluctance motor according to the present invention;
FIG. 3 is a schematic diagram of an interpolation point on the lower boundary of the right half of the first layer of flux barrier according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an interpolation point on the upper boundary of the right half of the first magnetic flux barrier according to an embodiment of the present invention;
fig. 5 is a radial cross-sectional view of the synchronous reluctance motor to be optimized according to the present invention;
fig. 6 is a radial cross-sectional view of the optimized synchronous reluctance motor of the present invention;
fig. 7 is a graph of output torque of a conventional synchronous reluctance motor and an optimized synchronous reluctance motor.
Reference numbers in the figures: 1-a rotor core; 2-a magnetic flux barrier; 3-a stator core; 4-armature winding.
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.
As shown in fig. 1, the present invention relates to an irregular magnetic flux barrier synchronous reluctance machine (referred to as a motor, see fig. 1-7 for short), which comprises a rotor core 1, a magnetic flux barrier 2, a stator core 3 and an armature winding 4; j layers of magnetic flux barriers 2 (two layers in the embodiment) are distributed below each rotor pole of the rotor core 1 along the radial direction of the motor, a magnetic conduction bridge is formed between two adjacent layers of magnetic flux barriers 2 under the same rotor pole, the magnetic flux barriers 2 and the magnetic conduction bridge under the same rotor pole are combined alternately, the shape of each layer of magnetic flux barrier 2 is symmetrical left and right, and the upper boundary and the lower boundary of each layer of magnetic flux barrier are not parallel; each boundary is in an irregular shape and is formed by sequentially connecting a plurality of line segments with different lengths and irregular positions, each boundary is converged from an end point to the middle part in the direction of the intersection point of the q axis and the boundary, the purpose is to enable an inductance difference value to appear between the d axis and the q axis, and the synchronous reluctance motor runs by utilizing reluctance torque generated by the inductance difference value between orthogonal axes under the excitation of three-phase sine alternating current.
The stator core 3 is of an annular structure, is provided with a plurality of teeth, and is provided with a plurality of slit grooves formed by the teeth and a yoke part for winding the armature winding 4; the armature winding is wound around the tooth part along the axial direction of the motor, and closed axial ends are formed on the front surface, the rear surface, the left surface and the right surface of the tooth part. The rotor core 1 and the stator core 3 are both made of silicon steel sheets through laminating.
The coordinates of each point on the lower boundary of the right half part of the jth layer of magnetic flux barrier are as follows:
wherein the content of the first and second substances,
the lower edges of the right half parts of the j-th magnetic flux barriers respectivelyThe distance from the nth point to the pole center of the rotor and the included angle between the nth point and the y axis are defined;
the coordinates of each point on the upper boundary of the right half of the jth layer of flux barrier are:
wherein the content of the first and second substances,
the distance from the nth point on the upper boundary of the right half part of the jth layer of magnetic flux barrier to the pole center of the rotor and the included angle between the nth point and the y axis are respectively;
the synchronous reluctance motor of the irregular flux barrier of the present embodiment is obtained by:
step one, establishing a finite element model of the motor according to the structural parameters of the motor in table 1, wherein each rotor pole comprises j layers of magnetic flux barriers, and each layer of magnetic flux barrier comprises an upper boundary and a lower boundary; each magnetic flux barrier is symmetrically divided into a left part and a right part, one end point of two boundaries of the right half part of each layer of magnetic flux barrier is positioned on the y axis, and the distance between one end point of the lower boundary and the pole center of the rotor is respectively equal to
At an angle to the y-axis of
One end point of the upper boundary is respectively distant from the pole center of the rotor
At an angle to the y-axis of
The distance from the other end point of the lower boundary of the right half part of each layer of the magnetic flux barrier to the pole center of the rotor is respectively
Respectively form included angles with the y-axis
The other end point of the upper boundary is respectively at a distance from the pole center of the rotor
Respectively form included angles with the y-axis
k is the total number of points on each boundary of the right half part of each layer of the magnetic flux barrier, and k is a positive integer;
TABLE 1 structural parameters of the electric machine
Inserting k-1 interpolation points between two end points of the lower boundary of the right half part of the jth layer of magnetic flux barrier by using an interpolation method, wherein the distance from each interpolation point to the pole center of the rotor satisfies the formula (1), and the included angle between each interpolation point and the y axis satisfies the formula (2);
in the formulas (1) and (2),
the distances from 1 st, 2 nd, 3 rd, k-2 th, k-1 st interpolation points on the lower boundary of the right half part of the jth magnetic flux barrier to the pole center of the rotor are respectively;
respectively are included angles between interpolation points of 1 st, 2 nd, 3 rd, k-2 th, k-1 th on the lower boundary of the right half part of the jth layer of magnetic flux barrier and the y axis,
are all the coefficients of the light-emitting diode,
the coordinates of each point on the lower boundary of the right half part of the jth layer of magnetic flux barrier are as follows:
similarly, k-1 interpolation points are inserted between two end points of the upper boundary of the right half part of the jth layer of magnetic flux barrier, the distance from each interpolation point to the pole center of the rotor satisfies the formula (4), and the included angle between each interpolation point and the y axis satisfies the formula (5);
formula (4), (b), (c)5) In (1),
the distances from 1 st, 2 nd, 3 rd, k-2 th, k-1 th interpolation points on the upper boundary of the right half part of the jth magnetic flux barrier to the pole center of the rotor are respectively;
respectively are included angles between interpolation points of 1 st, 2 nd, 3 rd, k-2 th, k-1 th and y-axis on the upper boundary of the right half part of the jth magnetic flux barrier,
are all the coefficients of the light-emitting diode,
and the coordinates of each point on the upper boundary of the right half part of the jth magnetic flux barrier layer are as follows:
the boundary of the left half part of the jth layer of magnetic flux barrier is symmetrical to the boundary of the right half part of the jth layer of magnetic flux barrier, so that the modeling of the jth layer of magnetic flux barrier is completed; modeling each layer of flux barriers of the same rotor pole according to the step until the modeling of all flux barriers under the same rotor pole is completed; then, rotating the rotor pole subjected to the magnetic flux barrier modeling by a certain angle to obtain a motor finite element model shown in the figure 5;
second, the coefficients are calculated
As a parameter set to be optimized; defining an objective function of an equation (7) by taking the minimum average output torque increase of the torque ripple as an optimization objective;
wherein, Taverage_Torque、TRippleRespectively representing the average output torque and the torque ripple, T, of the synchronous reluctance machine to be optimizedtrad._ave_Torque、Ttrad._RippleRespectively representing the average output torque and the torque ripple of the traditional synchronous reluctance motor;
and thirdly, setting the maximum step length and the minimum step length of the parameter group to be optimized, and optimizing the shape of the rotor of the synchronous reluctance motor to obtain the optimized synchronous reluctance motor shown in fig. 6.
Fig. 7 is a comparison graph of output torque of the optimized synchronous reluctance motor and that of the conventional synchronous reluctance motor, the average output torque of the optimized synchronous reluctance motor is 22.1Nm, and the torque ripple is 0.91%, and compared with the conventional synchronous reluctance motor, the torque ripple is reduced by 50.3%, and the average output torque is improved by 2.8%, because the ratio of the magnetic flux barriers in the rotor is reasonably selected in the parameter group optimizing process, the d-axis magnetic flux is effectively reduced by the irregular width of the magnetic flux barriers, and the q-axis magnetic flux is increased, so that the average output torque of the motor is improved.
The above-mentioned embodiments only express the embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. The utility model discloses the nothing is mentioned the part and is applicable to prior art.
Claims (4)
1. An irregular magnetic flux barrier synchronous reluctance motor comprises a rotor core, a magnetic flux barrier, a stator core and an armature winding; the magnetic flux shield structure is characterized in that j layers of magnetic flux barriers are distributed below each rotor pole of a rotor core along the radial direction of a motor, a magnetic conduction bridge is formed between two adjacent layers of magnetic flux barriers below the same rotor pole, the magnetic flux barriers and the magnetic conduction bridge below the same rotor pole are combined alternately, the shape of each layer of magnetic flux barrier is symmetrical left and right, and the upper boundary and the lower boundary of each layer of magnetic flux barrier are not parallel; each boundary is in an irregular shape and is formed by sequentially connecting a plurality of line segments with different lengths and irregular positions, and each boundary is converged from an end point to the middle part in sequence towards the direction of the intersection point of the q axis and the boundary.
2. The anomalous flux barrier synchronous reluctance machine of claim 1, wherein said stator core is of an annular configuration having a plurality of teeth; an armature winding is wound on each tooth.
3. The anomalous magnetic flux barrier synchronous reluctance motor of claim 1, wherein the rotor core and the stator core are made of silicon steel sheets by lamination.
4. The anomalous magnetic flux barrier synchronous reluctance motor according to any one of claims 1 to 3, wherein the coordinates of each point on the lower boundary of the right half of the j-th layer of the magnetic flux barrier are as follows:
wherein the content of the first and second substances,
the distance from the nth point on the lower boundary of the right half part of the jth layer of magnetic flux barrier to the pole center of the rotor and the included angle between the nth point and the y axis are respectively;
the coordinates of each point on the upper boundary of the right half of the jth layer of flux barrier are:
wherein the content of the first and second substances,
the distance from the nth point on the upper boundary of the right half part of the jth layer of magnetic flux barrier to the pole center of the rotor and the included angle between the nth point and the y axis are respectively;
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121296562.7U CN214756133U (en) | 2021-06-09 | 2021-06-09 | Irregular magnetic flux barrier synchronous reluctance motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121296562.7U CN214756133U (en) | 2021-06-09 | 2021-06-09 | Irregular magnetic flux barrier synchronous reluctance motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214756133U true CN214756133U (en) | 2021-11-16 |
Family
ID=78629329
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121296562.7U Active CN214756133U (en) | 2021-06-09 | 2021-06-09 | Irregular magnetic flux barrier synchronous reluctance motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214756133U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113315437A (en) * | 2021-06-09 | 2021-08-27 | 河北工业大学 | Synchronous reluctance motor rotor shape optimization method and synchronous reluctance motor |
-
2021
- 2021-06-09 CN CN202121296562.7U patent/CN214756133U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113315437A (en) * | 2021-06-09 | 2021-08-27 | 河北工业大学 | Synchronous reluctance motor rotor shape optimization method and synchronous reluctance motor |
| CN113315437B (en) * | 2021-06-09 | 2024-03-15 | 河北工业大学 | Synchronous reluctance motor rotor shape optimization method and synchronous reluctance motor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10770960B2 (en) | Permanent magnet assisted synchronous reluctance motor for increasing minimum electromagnetic torque | |
| Widmer et al. | Optimized segmental rotor switched reluctance machines with a greater number of rotor segments than stator slots | |
| WO2020092647A1 (en) | Torque ripple reduction in ac machines | |
| JP2017514453A (en) | Permanent magnet synchronous motor and its rotor | |
| CN107979196B (en) | Asymmetric permanent magnet auxiliary synchronous reluctance motor and design method for improving torque performance | |
| Li et al. | Sinusoidal back-EMF of vernier permanent magnet machines | |
| Wang et al. | Electromagnetic performance of an 18-slot/10-pole fractional-slot surface-mounted permanent-magnet machine | |
| Qi et al. | Effect of pole shaping on torque characteristics of consequent pole PM machines | |
| CN110022013A (en) | A kind of poles oblique and the asymmetric rotor of salient pole and high-performance permanent magnet motor | |
| CN103560634B (en) | Internal permanent magnet synchronous motor used for electric vehicle | |
| CN214756133U (en) | Irregular magnetic flux barrier synchronous reluctance motor | |
| CN104993629A (en) | Winding-type linear brushless doubly-fed generator | |
| JP4588255B2 (en) | Self-starting reluctance motor rotor | |
| Bi et al. | A novel axial flux interior permanent magnet motor with high torque density | |
| CN113315437B (en) | Synchronous reluctance motor rotor shape optimization method and synchronous reluctance motor | |
| CN109728658B (en) | Five-phase salient pole synchronous reluctance motor and torque ripple suppression method thereof | |
| Zhang et al. | Pole number selection strategy of low-speed multiple-pole permanent magnet synchronous machines | |
| Inte et al. | Design and analysis of outer rotor permanent magnet assisted synchronous reluctance machine with concentrated winding for small electric propulsion | |
| Tahi et al. | Performance optimization of synchronous reluctance machines with two rotor structures | |
| CN209593122U (en) | A kind of poles oblique and the asymmetric rotor of salient pole and high-performance permanent magnet motor | |
| CN111030403A (en) | Dual-rotor flux switching motor and optimization method thereof | |
| CN217282772U (en) | Synchronous reluctance motor | |
| CN108206595B (en) | Permanent magnet motor | |
| Baka et al. | Effect of flux barrier shape on the performance of a two-pole line-start synchronous reluctance motor | |
| TWI395390B (en) | Electrical machinery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |