CN109768645B - Permanent magnet auxiliary type synchronous reluctance motor rotor structure and design method thereof - Google Patents
Permanent magnet auxiliary type synchronous reluctance motor rotor structure and design method thereof Download PDFInfo
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Abstract
The invention relates to a permanent magnet auxiliary type synchronous reluctance motor rotor structure and a design method thereof, nlMiddle part of the layer insulation magnetic barrier is provided withThe permanent magnet structure is of an inverted triangle shape, namely the length of the permanent magnet is gradually reduced from the outermost layer to the innermost layer, the inverted triangle is an isosceles triangle, the included angle of the vertex of the isosceles triangle is theta, and the distance from the vertex of the inverted triangle to the axis is l; each permanent magnet is rectangular, the lower vertexes of the permanent magnets positioned on the same side are all positioned on the same straight line, the length of the inner side of the insulating magnetic barrier is the length of the rectangle, the width of the rectangle is the width of one end, close to the q axis, of the corresponding insulating magnetic barrier layer, and half of the length of each layer of permanent magnet of the rotor is defined as Xi，i＝1～nlThe number of the permanent magnets on the outermost layer is 1, the number of the permanent magnets on the other layers is 2, and the two permanent magnets on the other layers are symmetrically arranged by taking the q axis as a symmetry axis. Compared with a synchronous reluctance motor, the synchronous reluctance motor has the advantages that torque pulsation is reduced, and the efficiency and the power density of the motor are improved.
Description
Technical Field
The invention relates to a permanent magnet auxiliary type synchronous reluctance motor rotor structure and a design method thereof.
Background
In recent years, new energy automobiles are rapidly developed, and have many requirements on the efficiency, cost performance, safety and the like of motors, and the driving motors at the present stage are mainly asynchronous motors and permanent magnet synchronous motors. Although the asynchronous motor has a simple structure and mature technology, the efficiency and the power density are low, and the requirement of the motor on high performance cannot be met; the permanent magnet synchronous motor is efficient and reliable, and has a wide speed regulation range, but the production cost is higher and higher along with the rising of the price of permanent magnet materials. Therefore, a Permanent Magnet assisted Synchronous Reluctance Machine (PMaSynRM) has been proposed, which uses a relatively small amount of Permanent magnets and is a low-cost ferrite material. The PMaYnRM motor has the advantages of low cost, better overload capacity and wide constant-power operation range, and improves the power factor and efficiency compared with a synchronous reluctance motor. Therefore, how to design the ferrite structure to reduce the PMaSynRM torque ripple and improve the efficiency and the power factor becomes a hot issue of research in recent years.
PMaSynRM is very similar to synchronous reluctance machines, only permanent magnet material is inserted in some of the flux barriers of the rotor. The literature [ Yanwei Wang, Giacomo Bacco, Nicola Bianchi. geometry Analysis and optimization of PM-Assisted recovery Motors [ J ]. IEEE Transactions on Industry Applications,2017,53(5): 4338-. However, this method increases the amount of work and production costs of the designer, and also increases the torque ripple of the motor.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a novel rotor structure which can enable PMaSynRM to reduce torque ripple and improve power factor. On the basis of a designed rotor magnetic barrier structure of the synchronous reluctance motor, a permanent magnet material is inserted in an inverted triangle form, and the size of the permanent magnet is optimized by utilizing a Taguchi algorithm. Compared with a finite element method, the method is simple and easy to implement, and the calculation time is shortened; compared with a synchronous reluctance motor, the synchronous reluctance motor has the advantages that torque pulsation is reduced, and the efficiency and the power density of the motor are improved.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a permanent magnet auxiliary type synchronous reluctance motor rotor structure comprises nlLayer insulation barrier and nl+1 layers of magnetic silicon steel sheets, insulating barrier and magnetic silicon steel sheets arranged at intervals, nlThe area of each layer of insulating magnetic barrier is gradually reduced from the middle to the two sides, and the magnetic field-limiting device is characterized in that nlAn inverted triangle permanent magnet structure is arranged in the middle of the layer insulation magnetic barrier, namely the length of the permanent magnet is gradually reduced from the outermost layer to the innermost layer, the inverted triangle is an isosceles triangle, the included angle of the vertex of the isosceles triangle is theta, and the distance from the vertex of the inverted triangle to the axis is l; each permanent magnet is rectangular, the lower vertexes of the permanent magnets positioned on the same side are all positioned on the same straight line, and the inner side of the insulating magnetic barrier is longThe length of the rectangle is the width of one end of the corresponding insulating magnetic barrier layer close to the q axis, and the half of the length of each layer of permanent magnet of the rotor is defined as Xi，i＝1～nlThe number of the permanent magnets on the outermost layer is 1, the number of the permanent magnets on the other layers is 2, and the two permanent magnets on the other layers are symmetrically arranged by taking the q axis as a symmetry axis.
A design method of a permanent magnet auxiliary type synchronous reluctance motor rotor structure comprises the following steps:
the first step is as follows: determining the structural parameters of a permanent magnet assisted synchronous reluctance motor (PMaYnRM):
the PMaSynRM structure parameters are measured and obtained, and the PMaSynRM structure parameters comprise a stator and a rotor, wherein the stator structure comprises the number of stator slots and a stator tooth slot structure, and the rotor structure comprises the number of pole pairs, the number of magnetic barrier layers, the length of an iron core, and the length of an air gap between the inner diameter of the stator and the outer diameter of the rotor;
the second step is that: determining the insertion position of the inverted triangular permanent magnet structure:
the permanent magnet structure of the permanent magnet auxiliary type synchronous reluctance motor is designed to be an inverted triangle and is an isosceles triangle, namely the length of the permanent magnet is gradually reduced from the outermost layer to the innermost layer; the distance from the vertex of the inverted triangle to the axis is l, the included angle of the vertex of the isosceles triangle is theta, the overlapped part of the triangle and the insulating magnetic barrier is the position of the inserted permanent magnet, and the permanent magnet obtained on each layer is of a trapezoid-like structure; defining half of the length of each layer of permanent magnet of the rotor as Xi，i＝1,2,···,nlThe number of the permanent magnets on the outermost layer is 1, the number of the permanent magnets on the other layers is 2, and the two permanent magnets on the other layers are symmetrically arranged by taking the q axis as a symmetry axis; the length of the permanent magnet at the outermost layer cannot exceed the length of the corresponding insulating magnetic barrier, and the length of a single permanent magnet at the innermost layer is more than 1 mm; maximum value theta of distance l from vertex of inverted triangle to axis and included angle theta between vertex of corresponding isosceles trianglemaxThe range is limited, and the length value of each layer of insulating magnetic barrier of the rotor inserted into the permanent magnet is preliminarily obtained through simulation experiments;
the third step: taguchi optimizes pmasyrm rotor permanent magnet dimensions:
and respectively carrying out local optimization and adjustment on each layer of permanent magnet structure: firstly, giving an optimized range of a distance l from a vertex of an inverted triangle to an axis and an included angle theta between the vertex of an isosceles triangle, and changing the distance l from the vertex of the inverted triangle to the axis and the included angle theta between the vertex of the isosceles triangle to compare the magnitude of torque pulsation and a power factor in the optimized range;
secondly, changing the structure of the trapezoid-like permanent magnet obtained in the second step into a rectangle according to simulation analysis, wherein the two permanent magnets on each layer are equal in length, the length of the inner side of the insulating magnetic barrier is the length of the rectangle, and the width of one end, close to the q axis, of the insulating magnetic barrier is the width of the rectangle;
the local optimization process is carried out again: half X of the length of each layer of permanent magnet on the rotoriWithin the range of the level of (A), Taguchi optimization design is carried out to find different XiLower torque ripple value and power factor; and finally, selecting the length of the permanent magnet with the best motor performance through a simulation optimization result.
Compared with the existing permanent magnet auxiliary type synchronous reluctance motor, the permanent magnet auxiliary type synchronous reluctance motor has the following beneficial effects:
1. the length of the permanent magnet of the existing permanent magnet auxiliary type synchronous reluctance motor is basically increased from outside to inside in sequence or is the same, but the invention designs an inverted triangle permanent magnet structure, the outermost permanent magnet is the longest, and further the air gap flux density tends to be more sinusoidal, so that the cogging torque is reduced. And the torque ripple is reduced to some extent, the power factor is improved, the permanent magnet material is saved, and the cost is reduced. Experiments show that the novel permanent magnet auxiliary type synchronous reluctance motor rotor structure can effectively reduce 50% of torque pulsation, improves 23% of power factor, reduces the volume ratio of the permanent magnet by 26% originally, and saves production cost.
2. According to the method, firstly, the optimization ranges of the distance l from the vertex of the inverted triangle to the axis and the included angle theta between the vertex of the isosceles triangle are analyzed through simulation, then based on a Taguchi optimization method, the PMaSynRM structure with higher motor performance can be obtained only by knowing certain structural parameter sizes of the original motor body structure, the optimal combination of all parameters is obtained through the least experiments, the occupation of computer memory resources is reduced compared with a finite element method, and the time for optimization design is shortened.
The method and the device can be applied to the optimization design of the rotor structure of various permanent magnet auxiliary type synchronous reluctance motors used at present.
Drawings
FIG. 1 is a schematic diagram of the placement position of an inverted triangular permanent magnet of a permanent magnet assisted synchronous reluctance motor according to the present invention.
FIG. 2 is a schematic diagram of the mounting position of a rectangular permanent magnet of the permanent magnet assisted synchronous reluctance motor according to the present invention.
Fig. 3 is a graph showing a relationship between a distance l from a vertex to an axis of an inverted triangle, a torque ripple and a power factor according to an embodiment of the novel permanent magnet-assisted synchronous reluctance motor.
Fig. 4 is a graph showing a relationship between an included angle θ of a vertex of an inverted triangle and torque ripple and power factor of the inverted triangle according to the embodiment of the novel permanent magnet-assisted synchronous reluctance motor.
FIG. 5 shows a half X of the length of each layer of permanent magnet of the rotor of the novel permanent magnet assisted synchronous reluctance machine of the present inventioniPlotted against torque ripple.
FIG. 6 shows a half X of the length of each layer of permanent magnet of the rotor of the novel permanent magnet assisted synchronous reluctance machine of the present inventioniGraph against power factor.
Detailed Description
The present invention is described in detail below with reference to the drawings and examples, and it should be understood that the examples described herein are only for illustrating and explaining the present invention and do not limit the scope of protection of the present application.
The invention relates to a permanent magnet auxiliary type synchronous reluctance motor rotor structure, which comprises nlLayer insulation barrier and nl+1 layers of magnetic silicon steel sheets, insulating barrier and magnetic silicon steel sheets arranged at intervals, nlThe area of each layer of insulating magnetic barrier is gradually reduced from the middle to the two sides, and n islThe middle part of the layer insulation magnetic barrier is provided with an inverted triangle permanent magnet structure, namely the length of the permanent magnet is the longestThe outer layer gradually decreases to the innermost layer, the inverted triangle is an isosceles triangle, the included angle of the vertex of the isosceles triangle is theta, and the distance from the vertex of the inverted triangle to the axis is l; each permanent magnet is rectangular, the lower vertexes of the permanent magnets positioned on the same side are all positioned on the same straight line, the length of the inner side of the insulating magnetic barrier is the length of the rectangle, the width of the rectangle is the width of one end, close to the q axis, of the corresponding insulating magnetic barrier layer, and half of the length of each layer of permanent magnet of the rotor is defined as Xi，i＝1～nlThe number of the permanent magnets on the outermost layer is 1, the number of the permanent magnets on the other layers is 2, and the two permanent magnets on the other layers are symmetrically arranged by taking the q axis as a symmetry axis.
The invention also discloses a design method of the permanent magnet auxiliary type synchronous reluctance motor rotor structure, which comprises the following steps:
the first step is as follows: determining the structural parameters of a permanent magnet assisted synchronous reluctance motor (PMaYnRM):
the PMaSynRM structure parameters are measured and obtained, and the PMaSynRM structure parameters comprise a stator and a rotor, wherein the stator structure comprises the number of stator slots and a stator tooth slot structure, and the rotor structure comprises the number of pole pairs, the number of magnetic barrier layers, the length of an iron core, and the length of an air gap between the inner diameter of the stator and the outer diameter of the rotor;
the second step is that: determining the insertion position of the inverted triangular permanent magnet structure:
the permanent magnet structure of the permanent magnet auxiliary type synchronous reluctance motor is designed to be an inverted triangle and is an isosceles triangle, namely the length of the permanent magnet is gradually reduced from the outermost layer to the innermost layer; the distance from the vertex of the inverted triangle to the axis is l (unit mm), the included angle of the vertex of the isosceles triangle is theta (unit degree), the overlapped part of the triangle and the insulating magnetic barrier is the position of the inserted permanent magnet, and the permanent magnet obtained on each layer is of a trapezoid-like structure; because the number limit value of the rotor magnetic barrier layers is that the length of the first layer of permanent magnet cannot exceed the length limit of the insulation magnetic barrier, and the length of the fourth layer of permanent magnet material is greater than the limit value of 1mm, the distance l from the vertex of the inverted triangle to the axis and the included angle theta of the vertex of the isosceles triangle are both in a value range, and through a simulation experiment, the permanent magnet material is inserted into each layer of insulation magnetic barrier of the original rotor;
the third step: taguchi optimizes pmasyrm rotor permanent magnet dimensions:
the trapezoid-like permanent magnet structure obtained in the second step (the permanent magnet obtained in the second step is similar to a trapezoid, because the insulating magnetic barrier is arc-shaped, and the length of the outer side is longer than that of the inner side) is changed into a rectangle, so that the production and processing difficulty is reduced, and local optimization is facilitated; and respectively carrying out local optimization and adjustment on each layer of permanent magnet structure: firstly, giving an optimized range of a vertex-to-axis distance l of the inverted triangle and an included angle theta of the vertex of the isosceles triangle, and changing the vertex-to-axis distance l of the inverted triangle and the included angle theta of the vertex of the isosceles triangle in the optimized range to compare the magnitude of torque pulsation and power factor; secondly, the permanent magnets of each layer are changed into rectangular structures with the same length, according to simulation analysis, when the length of the inner side of the insulated magnetic barrier is the length of a rectangle, and the width of one end, close to the q axis, of the insulated magnetic barrier is the width of the rectangle, the torque pulsation of the motor is small, the cost is lower, and half of the length of each layer of the permanent magnets of the rotor is defined as Xi(i＝1,2,···,nl) (unit mm), the width of each layer of permanent magnet is consistent with that of the insulating tail end; again for the local optimization process, X is half the length of the permanent magnets in each layer of the rotoriWithin the range of the level of (A), a Taguchi method is carried out to find different XiLower torque ripple value and power factor; and finally, through a simulation optimization result, the length of the permanent magnet with the best motor performance (the length is based on the standard of small torque ripple and large power factor) is properly selected.
The PMaSynRM in the following embodiments is exemplified by a transverse laminated rotor motor.
Fig. 1 is a schematic diagram showing the placement position of an inverted triangle permanent magnet of a permanent magnet auxiliary type synchronous reluctance motor rotor structure of the present invention, wherein l represents the distance (in mm) from the vertex of the inverted triangle to the axis, and θ represents the included angle (in °) of the vertex of the isosceles triangle.
FIG. 2 is a schematic diagram of the placement positions of rectangular permanent magnets of the rotor structure of the permanent magnet assisted synchronous reluctance motor according to the present invention, wherein X isiRepresenting half the length (in mm) of the permanent magnets per layer of the rotor.
Fig. 3 is a graph of a relationship between a distance l from a vertex of an inverted triangle to an axis, a torque ripple and a power factor, and a result graph obtained by using a Taguchi optimization algorithm, wherein an abscissa represents the distance l (unit mm) from the vertex of the inverted triangle to the axis, a left ordinate represents the torque ripple, and a right ordinate represents the power factor.
Fig. 4 is a graph of a relationship between an isosceles triangle vertex angle θ and torque ripple and a power factor, and a result graph obtained by using a Taguchi optimization algorithm, in which an abscissa represents the isosceles triangle vertex angle θ (unit °), a left ordinate represents the torque ripple, and a right ordinate represents the power factor, according to an embodiment of the novel permanent magnet-assisted synchronous reluctance motor rotor structure of the present invention.
FIG. 5 shows a half X of the length of each layer of permanent magnet of the rotor of the novel permanent magnet assisted synchronous reluctance motor rotor structure according to an embodiment of the present inventioniA torque ripple relation curve graph and a result graph obtained by using a Taguchi optimization algorithm, wherein the abscissa is half X of the length of each layer of permanent magnet of the rotori(in mm) and the ordinate is the torque ripple of PMaSynRM.
FIG. 6 shows an embodiment of a rotor structure of a permanent magnet assisted synchronous reluctance machine according to the present invention, in which the length of each layer of permanent magnets of the rotor is half XiA graph related to the power factor, a result graph obtained by using a Taguchi optimization algorithm, and the abscissa is half X of the length of each layer of permanent magnet of the rotori(in mm) and the ordinate is the power factor of PMaSynRM.
Examples
In the embodiment, PMaSynRM is taken as an implementation object, a rotor structure of the rotor structure is formed by alternately laminating silicon steel sheets and insulating plastics (or electrical paper and other insulating materials), particularly, a certain amount of permanent magnet material is put into the insulating material of PMaSynRM, the silicon steel sheets are magnetic conductive materials, and physical characteristics are shown as anisotropy, namely, along different directions of crystal lattices, periodicity and density degree of atomic arrangement are different, so that physicochemical characteristics of crystals in different directions are different.
The specific steps of the rotor structure optimization design for improving the torque ripple and the power factor of the rotor structure of the permanent magnet auxiliary type synchronous reluctance motor in the embodiment are as follows:
the first step is as follows: determining the structural parameters of a permanent magnet assisted synchronous reluctance motor (PMaYnRM):
the PMaSynRM structure parameters are measured and obtained, the PMaSynRM structure parameters comprise a stator and a rotor, the stator structure comprises the number of stator slots and a stator tooth slot structure, and the rotor structure comprises the number of pole pairs, the number of magnetic barrier layers, the length of an iron core, and the length of an air gap between the inner diameter of the stator and the outer diameter of the rotor; the PMaSynRM stator structure adopts a Y160-4M type three-phase asynchronous motor stator, and the main parameters of the PMaSynRM stator structure are as follows: the outer diameter of the stator is 260mm, the inner diameter of the stator is 170mm, the number of parallel branches is 1, the number of turns of a coil is 28, and the effective length l of an iron core is 155 mm; specific other dimensional parameters can be detailed in the book of application of Ansoft 12 in engineering electromagnetic fields, which is written by Zhao Bo and Zhang hong volume and published by Chinese water conservancy and hydropower Press in 2010;
the second step is that: determining the structural parameters of the inverted triangular permanent magnet:
the permanent magnet structure of the permanent magnet auxiliary type synchronous reluctance motor rotor structure is designed into an inverted triangle shape, namely the length of the permanent magnet is gradually reduced from a first layer to a last layer; the distance from the vertex of the given inverted triangle to the axis is l (unit mm), the included angle of the vertex of the given inverted triangle is theta (unit DEG), and the interior of the included angle is made of permanent magnet material. Due to the limitation of the number and length of the layers of the rotor magnetic barriers, the maximum value theta of the included angle theta between the vertex of the inverted triangle and the axis and the vertex of the corresponding isosceles trianglemaxBoth have a limited range; through simulation experiments, the length value of each layer of insulating magnetic barrier of the rotor inserted into the permanent magnet is preliminarily obtained, so that torque pulsation is reduced, and the power factor is improved;
table 1 shows the initial simulation results of the distance l from the vertex of the inverted triangle to the axis, the included angle θ between the vertex of the isosceles triangle, and the torque ripple (%);
table 2 shows the initial simulation results of the distance l from the vertex of the inverted triangle to the axis, the included angle θ between the vertex of the isosceles triangle and the power factor;
the third step: taguchi optimizes pmasyrm rotor permanent magnet dimensions:
the permanent magnet structure obtained in the second step is changed into a rectangle, so as to reduce the production and processing difficulty,local optimization is facilitated; and respectively carrying out local optimization adjustment on the length of each layer of permanent magnet: firstly, giving an optimized range of a vertex-to-axis distance l of the inverted triangle and an included angle theta of the vertex of the isosceles triangle, and changing the vertex-to-axis distance l of the inverted triangle and the included angle theta of the vertex of the isosceles triangle in the optimized range to compare the magnitude of torque pulsation and power factor; secondly, on the basis, the permanent magnets of each layer are changed into rectangular structures with the same length, the fact that when the length of the inner side of the insulated magnetic barrier is a rectangular side length, the torque ripple of the motor is small and the cost is low is obtained according to simulation analysis, and half of the length of each layer of permanent magnets of the rotor is defined as Xi(i is 1,2,3,4) (unit mm), and the width of each layer of the permanent magnet is consistent with that of one end of the insulating magnetic barrier close to the q axis; again for the local optimization process, X is half the length of the permanent magnets in each layer of the rotoriWithin the range of the level of (A), Taguchi optimization design is carried out to find different XiLower torque ripple and power factor; finally, the length of the permanent magnet with the best motor performance is properly selected through a simulation optimization result;
TABLE 3 half the length of each layer of permanent magnets of the rotor XiTaking values for the levels of the parameters to be optimized;
TABLE 4 half the length of each layer of permanent magnets of the rotor XiOrthogonal experimental design scheme table (2).
The embodiment adopts the inverted-triangular inserted permanent magnet material, the air gap flux density is more uniform by properly adding the first layer of permanent magnet, the cogging torque and the air gap flux density harmonic wave are reduced, and the cost can be reduced as far as possible by reducing the permanent magnet material layer by layer on the premise of not influencing the performance of the motor. The distance from the vertex of the given inverted triangle to the axis is l (unit mm), the included angle of the vertex of the given inverted triangle is theta (unit DEG), and the interior of the included angle is made of permanent magnet material. Because the number of the rotor magnetic barriers is four, the length of the first layer of permanent magnet cannot exceed the length limit of the insulation magnetic barrier, the material of the fourth layer of permanent magnet is larger than 1mm, the maximum value of the distance l from the vertex of the inverted triangle to the axis and the included angle theta of the corresponding vertex of the isosceles triangle is limited, namely l is more than or equal to 10 and less than or equal to 30, and theta is more than or equal to 36 and less than or equal to 48. The effects of two parameters on torque ripple and power factor can be seen in the experimental simulations of tables 1 and 2The true result value can be obtained preliminarily, the length value of each layer of insulating magnetic barrier of the rotor inserted into the permanent magnet can be obtained preliminarily, the torque ripple can be reduced as much as possible, and the power factor can be improved. The permanent magnet structure is further changed into a rectangle, so that the production and processing difficulty is reduced, local optimization is facilitated, the optimization range of the distance l from the vertex of the inverted triangle to the axis and the included angle theta of the vertex of the isosceles triangle is given, and the distance l from the vertex of the inverted triangle to the axis and the included angle theta of the vertex of the isosceles triangle are changed in the optimization range to compare the torque ripple and the power factor; secondly, the permanent magnets of each layer are changed into rectangular structures with the same length, the length of the inner side of the insulated magnetic barrier is a rectangular side length, the torque pulsation of the motor is smaller, the cost is lower, and half of the length of each layer of permanent magnets of the rotor is defined as Xi(i＝1,2,···,nl) (unit mm), the width of each layer of permanent magnet is consistent with that of the insulating tail end; again for the local optimization process, X is shown in Table 3iWithin the range of levels of (a) and using a Taguchi optimization method for XiDesign, find different XiThe specific data of the torque ripple value and the power factor are shown in Table 4, and can be obtained by calculating the specific weight of the mean value and the variance, and if the torque ripple is to be minimized, X isi31mm, 11mm, 9mm and 4mm in this order, a torque ripple of 5.75%, a power factor of 0.713, and X is X if the power factor is to be maximizediSequentially taking 32mm, 13mm, 9mm and 4mm, wherein the torque ripple is 6.47 percent, and the power factor is 0.742; and finally, the influence of torque ripple and power factor is considered in a compromise mode through a simulation optimization result, and the length of the permanent magnet with the best motor performance is selected properly.
The invention relates to a novel permanent magnet auxiliary type synchronous reluctance motor rotor structure, namely an inverted-triangular permanent magnet auxiliary type synchronous reluctance motor PMaYnRM. And carrying out simulation experiments on the distance l from the vertex of the inverted triangle to the axis and the corresponding included angle theta between the vertex of the isosceles triangle to obtain the initial permanent magnet structure. On the basis, the fine-tuning permanent magnet structure is rectangular, half of the length of each layer of permanent magnet is optimized by a Taguchi method, power factors are gradually improved, torque pulsation is reduced, permanent magnet materials are saved as far as possible, the size of the permanent magnet is selected according to performance requirements, and then a final motor model is obtained.
The exemplary embodiments of the present invention should be understood as an example within the scope of the claims of the present invention, and the technical solutions can be implemented by those skilled in the art without limitation.
TABLE 1 initial simulation results of l (mm) and θ (°) with torque ripple (%)
TABLE 2 initial simulation results of l (mm) and θ (°) with power factor
TABLE 3 parameter X to be optimizedi(mm) level value
TABLE 4Xi(mm) orthogonal test design scheme
Nothing disclosed in this application is applicable to the prior art.
Claims (2)
1. A permanent magnet auxiliary type synchronous reluctance motor rotor structure comprises nlLayer insulation barrier and nl+1 layers of magnetic silicon steel sheets, insulating barrier and magnetic silicon steel sheets arranged at intervals, nlThe insulating magnetic barriers of each layer are gradually reduced from the middle to the two sides,characterized in that n islAn inverted triangle permanent magnet structure is arranged in the middle of the layer insulation magnetic barrier, namely the length of the permanent magnet is gradually reduced from the outermost layer to the innermost layer, the inverted triangle is an isosceles triangle, the included angle of the vertex of the isosceles triangle is theta, and the distance from the vertex of the isosceles triangle to the axis is l; each permanent magnet is rectangular, the lower vertexes of the permanent magnets positioned on the same side are all positioned on the same straight line, the length of the inner side of the insulating magnetic barrier is the length of the rectangle, the width of the rectangle is the width of one end, close to the q axis, of the corresponding insulating magnetic barrier layer, and half of the total length of each layer of permanent magnet of the rotor is defined as Xi，i＝1～nlThe number of the permanent magnets on the outermost layer is 1, the number of the permanent magnets on the other layers is 2, and the two permanent magnets on the other layers are symmetrically arranged by taking the q axis as a symmetry axis.
2. A design method of a permanent magnet auxiliary type synchronous reluctance motor rotor structure comprises the following steps:
the first step is as follows: determining the structural parameters of the permanent magnet auxiliary type synchronous reluctance motor:
the method comprises the steps of measuring to obtain structural parameters of the permanent magnet auxiliary type synchronous reluctance motor, wherein the structural parameters comprise a stator and a rotor, the stator structure comprises a stator slot number and a stator slot structure, and the rotor structure comprises a pole pair number, a magnetic barrier layer number, an iron core length and an air gap length between the inner diameter of the stator and the outer diameter of the rotor;
the second step is that: determining the insertion position of the inverted triangular permanent magnet structure:
the permanent magnet structure of the permanent magnet auxiliary type synchronous reluctance motor is designed to be an inverted triangle and is an isosceles triangle, namely the length of the permanent magnet is gradually reduced from the outermost layer to the innermost layer; the distance from the vertex of the isosceles triangle to the axis is l, the included angle of the vertex of the isosceles triangle is theta, the overlapped part of the triangle and the insulating magnetic barrier is the position of the inserted permanent magnet, and the permanent magnet obtained on each layer is of a trapezoid-like structure; defining half of the total length of each layer of permanent magnet of the rotor as Xi，i＝1,2,···,nlThe number of the permanent magnets on the outermost layer is 1, the number of the permanent magnets on the other layers is 2, and the two permanent magnets on the other layers are symmetrically arranged by taking the q axis as a symmetry axis; the length of the outermost permanent magnet cannot exceedThe length of the single permanent magnet at the innermost layer is larger than 1mm corresponding to the length of the insulating magnetic barrier; the maximum value theta of the distance l from the vertex of the isosceles triangle to the axis and the included angle theta between the vertex of the corresponding isosceles trianglemaxThe range is limited, and the length value of each layer of insulating magnetic barrier of the rotor inserted into the permanent magnet is preliminarily obtained through simulation experiments;
the third step: taguchi optimizes the size of the permanent magnet auxiliary type synchronous reluctance motor rotor:
and respectively carrying out local optimization and adjustment on each layer of permanent magnet structure: firstly, giving an optimized range of a distance l from a vertex of an isosceles triangle to an axis and an included angle theta between the vertex of the isosceles triangle, and changing the distance l from the vertex of the isosceles triangle to the axis and the included angle theta between the vertex of the isosceles triangle to compare the magnitude of torque pulsation and a power factor in the optimized range;
secondly, changing the structure of the trapezoid-like permanent magnet obtained in the second step into a rectangle according to simulation analysis, wherein the two permanent magnets on each layer are equal in length, the length of the inner side of the insulating magnetic barrier is the length of the rectangle, and the width of one end, close to the q axis, of the insulating magnetic barrier is the width of the rectangle;
the local optimization process is carried out again: half X of the length of each layer of permanent magnet on the rotoriWithin the range of the level of (A), Taguchi optimization design is carried out to find different XiLower torque ripple value and power factor; and finally, selecting the length of the permanent magnet with the best motor performance through a simulation optimization result.
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| CN114142688B (en) * | 2021-12-02 | 2023-02-03 | 常州工学院 | Reluctance motor magnetic barrier end deflection method for inhibiting torque pulsation |
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| CN204906031U (en) * | 2015-05-12 | 2015-12-23 | 上海吉亿电机有限公司 | Supplementary synchronous reluctance machine rotor of permanent magnetism that can be used to high -speed occasion |
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| CN105846579A (en) * | 2016-05-17 | 2016-08-10 | 华中科技大学 | Permanent magnet reluctance motor |
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