CN110971037B - Rotor structure of permanent magnet auxiliary type bearingless synchronous reluctance motor - Google Patents
Rotor structure of permanent magnet auxiliary type bearingless synchronous reluctance motor Download PDFInfo
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- CN110971037B CN110971037B CN201911242920.3A CN201911242920A CN110971037B CN 110971037 B CN110971037 B CN 110971037B CN 201911242920 A CN201911242920 A CN 201911242920A CN 110971037 B CN110971037 B CN 110971037B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
- H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/02—Details
- H02K21/021—Means for mechanical adjustment of the excitation flux
- H02K21/028—Means for mechanical adjustment of the excitation flux by modifying the magnetic circuit within the field or the armature, e.g. by using shunts, by adjusting the magnets position, by vectorial combination of field or armature sections
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
- H02K29/03—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
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Abstract
The invention discloses a rotor structure of a permanent magnet auxiliary type bearingless synchronous reluctance motor, wherein four groups of magnetic barriers are uniformly and symmetrically arranged on the rotor structure along the circumferential direction, each magnetic barrier is divided into an inner layer, a middle layer and an outer layer from inside to outside, each magnetic barrier comprises a rectangular permanent magnet installation groove, two magnetic isolation bridges and two rib parts, the two magnetic isolation bridges are symmetrically distributed on the central line of the diameter direction of the permanent magnet installation groove, the two rib parts are arranged between the permanent magnet installation groove and the magnetic isolation bridges, a permanent magnet is fixedly embedded in the permanent magnet installation groove in each magnetic barrier, the radial contour line of each magnetic isolation bridge comprises an outer boundary line of the magnetic isolation bridge, an inner boundary line of the magnetic isolation bridge and an end part of the magnetic isolation bridge, the two ends of the end part of the magnetic isolation bridge are respectively connected with the outer boundary line of the magnetic isolation bridge and the inner boundary line of the magnetic isolation bridge, the outer boundary line of the magnetic isolation bridge, the inner boundary line of the magnetic isolation bridge and the central line of the magnetic isolation bridge are respectively quadratic function curve sections, and the end part of the magnetic isolation bridge is composed of two Bezier cubic curves, effectively reducing the torque and the suspension force pulsation.
Description
Technical Field
The invention belongs to the field of motor manufacturing and control, and relates to a permanent magnet auxiliary type bearingless synchronous reluctance motor, in particular to a rotor structure of the permanent magnet auxiliary type bearingless synchronous reluctance motor, which can reduce torque and suspension force pulsation.
Background
The bearingless motor is an AC motor with novel and unique structure and principle, its stator torque winding is overlapped with a suspension force winding whose pole pair number difference is 1, and the electromagnetic torque and radial suspension force can be simultaneously produced by controlling the current passed through these two windings. The synchronous reluctance motor has the advantages of fast dynamic response, simple structure, low cost and the like, and is more and more widely concerned in industrial application. The bearingless synchronous reluctance motor has the advantages of both a magnetic bearing and the synchronous reluctance motor, and can utilize reluctance torque to the maximum extent. The salient pole type rotor bearingless synchronous reluctance motor designed by A.Chiba et al in Japan has the advantages of simple structure, low manufacturing cost, easy realization of high-speed or ultrahigh-speed operation and the like, but the salient pole ratio (the ratio of quadrature axis inductance to direct axis inductance) of the salient pole type rotor bearingless synchronous reluctance motor is lower, so that the power factor, the torque density and the efficiency of the motor are lower, and the application range of the motor is limited. The bearingless synchronous reluctance motor designed by m.takemoto et al in japan adopts a multilayer magnetic barrier type rotor, and the salient pole ratio of the bearingless synchronous reluctance motor is improved, but the defect of low torque density is not improved. The novel permanent magnet auxiliary type bearingless synchronous reluctance motor formed by injecting the permanent magnet into the magnetic barrier rotor of the bearingless synchronous reluctance motor has the advantages of high power factor, high torque density and high efficiency, has wide weak magnetic speed regulation capacity and further widens the application range of the bearingless synchronous reluctance motor.
The document with the Chinese patent application number of CN201621414659.2 discloses a permanent magnet auxiliary type bearingless synchronous reluctance motor, wherein magnetic barriers are arc-shaped and symmetrically distributed along a d axis, a permanent magnet mounting groove is formed in the middle of each magnetic barrier, and permanent magnets are embedded in the permanent magnet mounting grooves. The problem of the motor power factor that the salient pole ratio of traditional bearingless synchronous reluctance motor is low to lead to is solved to and the problem that the torque density that does not contain the permanent magnet in traditional bearingless synchronous reluctance motor rotor and lead to is low is solved. However, due to the addition of the permanent magnet in the rotor magnetic barrier, the problems of torque ripple and levitation force ripple generated by the harmonic interaction of the stator magnetomotive force and the rotor magnetomotive force are more serious, and the stable operation of the motor is adversely affected. Victor et al analyzed the torque and suspension pulsation suppression effect of rotor skewed poles, stator winding short-distance and rotor asymmetric magnetic barriers on bearingless synchronous reluctance motors by using a finite element method. However, this method increases the workload of the designer and has a certain influence on the rotor suspension performance.
Therefore, when a proper permanent magnet material is selected, how to design a rotor structure of the motor to obtain a permanent magnet auxiliary type bearingless synchronous reluctance motor with high torque density and high power density becomes a key problem for further development of the current bearingless synchronous reluctance motor.
Disclosure of Invention
The invention aims to provide a rotor structure of a permanent magnet auxiliary type bearingless synchronous reluctance motor, which is used for solving the problem that the existing permanent magnet auxiliary type bearingless synchronous reluctance motor has larger torque and suspension force pulsation in the operation process and improving the control precision of the motor, thereby realizing the stable suspension and high-efficiency operation of a motor rotor and being better applied to an electric transmission system.
The invention relates to a technical scheme adopted by a rotor structure of a permanent magnet auxiliary type bearingless synchronous reluctance motor, which comprises the following steps: the center of the magnetic barrier is coaxially sleeved with a rotating shaft, four groups of magnetic barriers are uniformly and symmetrically arranged on the rotating shaft along the circumferential direction, each group of magnetic barriers is divided into an inner layer, a middle layer and an outer layer of magnetic barriers from inside to outside, each layer of magnetic barriers comprises a rectangular permanent magnet mounting groove, two magnetic isolation bridges symmetrically distributed about the center line of the diameter direction of the permanent magnet mounting groove and two rib parts between the permanent magnet mounting groove and the magnetic isolation bridges, a permanent magnet is fixedly embedded in the permanent magnet mounting groove in each layer of magnetic barriers, the permanent magnets are magnetized in parallel along the radial center line direction of the permanent magnets, and the magnetizing directions of two adjacent groups of permanent magnets are opposite; the radial contour lines of each magnetic isolation bridge comprise an outer boundary line of the magnetic isolation bridge, an inner boundary line of the magnetic isolation bridge and an end part of the magnetic isolation bridge, the two ends of the end part of the magnetic isolation bridge are respectively connected with the outer boundary line of the magnetic isolation bridge and the inner boundary line of the magnetic isolation bridge, the radial contour lines of the magnetic isolation bridge are uniformly divided into inner and outer half contour lines by the center line of the magnetic isolation bridge, the outer boundary line of the magnetic isolation bridge, the inner boundary line of the magnetic isolation bridge and the center line of the magnetic isolation bridge are quadratic function curve segments, and the end part of the magnetic isolation bridge is composed of two Bezier cubic curves.
The center line direction of the permanent magnet along the diameter direction is the y-axis direction, the x-axis direction is the center line direction of the permanent magnet in the adjacent group of magnetic barriers, two magnetic isolation bridges in each layer of magnetic barriers are symmetrically distributed about the x-axis or the y-axis, and the distance between the two layers of permanent magnets in each group of magnetic barriers along the diameter direction is the same; the middle line of the magnetic isolation bridge is a quadratic function curve PFT1Upper curve segment, quadratic function curve PFT1Vertex P of2At a vertical distance d from the y-axis1/2+rib，d1Is the tangential length of the permanent magnets in the layer of the magnetic barrier, rib is the tangential width of the rib in the layer of the magnetic barrier, and the apex P2At a vertical distance w from the x-axis1S is the radial distance of the center of the inner surface of the layer of permanent magnet from the center O of the rotating shaft, w1Is the radial thickness of the layer of permanent magnets 3, passing through the apex P2And the axis parallel to the y-axis is the curve of the quadratic function PFT1Axis of symmetry YL1Axis of symmetry YL1Perpendicular to the x-axis; curve P of quadratic functionFT1End point P of1At an angle alpha to the x-axis1In the radial direction, end point P1The distance from the center O of the rotating shaft is a radius RFX，RFXR-1, R being the radius of the rotor, end point P1Curve P about a quadratic functionFT1Axis of symmetry YL1Is point P1s(ii) a The included angle between the end point of the middle line (21) of the magnetic isolation bridge of the inner layer magnetic barrier and the x axis is alpha1The included angle between the end point of the middle line of the magnetic isolation bridge of the middle layer magnetic barrier and the x axis is alpha2The included angle between the end point of the middle line of the magnetic isolation bridge of the outer layer magnetic barrier and the x axis is alpha3And satisfy α3>α2>α1。
Starting point P of outer boundary line of magnetic isolation bridge2HStarting point P of boundary line in magnetic isolation bridge2LPerpendicular distance between the magnetic shielding layer and the y axis and the starting point P of the middle line of the magnetic shielding bridge2The vertical distances to the y-axis are the same and are all d1/2+rib2All are located on the symmetry axis Y of the quadratic function curveL1Upper, starting point P2HAt a vertical distance w from the x-axis1+ s, starting point P2LPerpendicular to the x-axis at a distance s, and an end point P of the outer boundary line of the magnetic shield bridge1HDistance from x axis and end point P of magnetic isolation bridge midline1The distance between the magnetic shielding layer and the x axis is the same, and the end point P of the boundary line in the magnetic shielding bridge1LDistance between the magnetic shielding bridge and the y axis and the middle line terminal point P of the magnetic shielding bridge1The same vertical distance from the y-axis.
The extension line of the outer boundary of the direct magnetic isolation bridge is a straight line BTLStraight line BTLPassing through the end point P1HThe extension line of the inner boundary of the magnetic isolation bridge is a straight line BLLStraight line BTLSelecting an end point P away from the outer boundary of the magnetic isolation bridge1HA distance S1PPoint S ofH1(ii) a On a straight line BLLUpper selection of an end point P from the inner boundary of the magnetic separation bridge1LA distance S1PPoint S ofL1(ii) a Straight line BTLThe included angle between the positive direction of the x axis and the x axis is 0-45 degrees, and a straight line BELAnd a straight line BTLStraight line BLLEnd point P intersecting and passing through the centerline of the magnetic isolation bridge1And the included angle between the X-axis and the X-axis in the negative direction is 0-30 degrees and is on a straight line BELEnd point P of1On both sides of (A), each selecting a distance end point P1Is S2PThe outer half contour line of the end part of the magnetic isolation bridge passes through four points P1H、SH1、SH2、P1The Bezier cubic curve of (1) is that the inner half contour line of the end part of the magnetic isolation bridge passes through four points P1L、SL1、SL2、P1Bezier cubic curve of (1).
The invention has the advantages that:
1. the invention improves the traditional linear and arc magnetic barrier structures on the rotor, and the shape of the magnetic isolation bridge is determined by a mathematical expression, so that the magnetic isolation bridge is more accurate, and the workload of a designer is reduced.
2. The boundary line of the magnetic isolation bridge consists of a quadratic function curve and a Bezier curve, and does not consist of a single curve any more, so that the freedom degree of the shape change of the magnetic isolation bridge is higher, and the torque and the suspension force pulsation are effectively reduced.
3. The boundary line of the magnetic isolation bridge is determined by a mathematical expression, so that the relationship between the shape of the magnetic isolation bridge and the magnetomotive force of the rotor and the magnetomotive force of the stator can be analyzed from the angle of numerical analysis, and the relationship between the shape of the magnetic isolation bridge and the torque pulsation and the suspension force pulsation can be deduced. The magnetic field distribution of the motor is optimized by improving or changing the structure of the motor, so that the main harmonic waves causing torque pulsation and levitation force pulsation are reduced, and the motor can stably run at high speed.
4. The permanent magnet consumption in the rotor is gradually reduced from inside to outside layer by layer, so that higher torque density can be obtained under the condition of less permanent magnet consumption, weak magnetism can be easily realized during high-speed operation, and the constant-power speed regulation range is wide.
Drawings
FIG. 1 is a schematic radial cross-sectional view of a permanent magnet assisted bearingless synchronous reluctance machine;
FIG. 2 is an axial cross-sectional schematic view of the motor shown in FIG. 1;
FIG. 3 is an enlarged schematic view of one of the pole structures of the rotor shown in FIG. 2;
FIG. 4 is an enlarged view of the inner magnetic barrier of FIG. 3;
FIG. 5 is an enlarged schematic view of the boundary line design structure of the magnetic bridge in FIG. 4;
fig. 6 is an enlarged schematic view of the design structure of the end part of the magnetic isolation bridge in fig. 4.
In the figure: 1. a stator; 2. a rotor; 3. a permanent magnet; 4. a permanent magnet mounting groove; 5. a magnetic isolation bridge; 6. a rotating shaft; 7. stator teeth; 8. a stator slot; 9. a stator yoke; 10. a stator torque winding; 11. a levitation force winding; 12. a rib portion; 13. a photoelectric encoder; 14. an eddy current sensor; 15. a housing; 16. a self-aligning ball bearing; 17. an auxiliary bearing; 18. an internal thread cooling tube; 19. a left end cap; 20. a right end cap; 21. the middle line of the right magnetic isolation bridge; 22. the outer boundary line of the right magnetic isolation bridge; 23. the inner boundary line of the right magnetic isolation bridge; 24. the right magnetic isolation bridge end part;
Detailed Description
Referring to fig. 1, the permanent magnet auxiliary type bearingless synchronous reluctance motor comprises a stator 1, a rotor 2 and a rotating shaft 6, wherein the rotor 2 is coaxially positioned inside the stator 1, the rotating shaft 6 is coaxially sleeved at the center of the rotor 2, and a groove is formed in the center of the rotor 2 and used for placing the rotating shaft 6. The stator 1 is provided with double-layer windings, the outer-layer winding is a torque winding 10, and the inner-layer winding is a suspension winding 11. An air gap is arranged between the inner wall of the stator 1 and the outer wall of the rotor 2, and the thickness of the air gap is related to the power grade of the motor, the selected permanent magnet material and the processing and assembling processes of the stator 1 and the rotor 2. The casing 15 is used for fixing the stator 1, the left end cover 19 and the right end cover 20, the left end cover 19 is used for fixing the self-aligning ball bearing 14, and the right end cover 20 is used for fixing the auxiliary bearing 17. The self-aligning ball bearing 16 enables one end of a motor rotating shaft to be fixed in the axial direction and flexibly move in two radial degrees of freedom, and the auxiliary bearing 17 is used for avoiding collision caused in the suspension or static process of the motor. The photoelectric encoder 13 and the eddy current sensor 14 are respectively installed at the left and right ends of the rotating shaft 6 for detecting the rotating speed and radial displacement of the motor.
Referring to fig. 2, the stator 1 and the rotor 2 are both formed by laminating silicon steel sheets with the thickness of 0.35mm, the laminating coefficient is 0.95, and the rotating shaft 6 is made of a non-magnetic material. Four groups of magnetic barriers are uniformly and symmetrically arranged on the rotor 2 along the circumferential direction of the rotor, and each group of magnetic barriers is divided into three layers from inside to outside, namely an inner layer magnetic barrier, a middle layer magnetic barrier and an outer layer magnetic barrier. Each layer of magnetic barrier comprises a rectangular permanent magnet installation groove 4, two magnetic isolation bridges 5 which are symmetrically distributed about the center line of the diameter direction of the permanent magnet installation groove 4, and two rib parts 12 which are arranged between the permanent magnet installation groove 4 and the magnetic isolation bridges 5. A permanent magnet 3 is fixedly embedded in a permanent magnet mounting groove 4 in each layer of magnetic barrier, and the size of the permanent magnet 3 is the same as that of the permanent magnet mounting groove 4. The permanent magnets 3 are ferrite permanent magnets, the permanent magnets 3 are four groups, the permanent magnets 3 are magnetized in parallel along the radial central line direction of the permanent magnets, and the magnetizing directions of the two adjacent groups of permanent magnets 3 are opposite. An epoxy resin-based composite material is filled at each of the magnetic bridges 5 to reinforce the strength of the rotor 2. Between the permanent magnet installation groove 4 and the magnetic isolation bridge 5 in each layer of magnetic barrier is a rib 12.
Referring to fig. 3, the tangential width rib of the rib 12 is the distance between the permanent magnet mounting slot 4 and the magnetic isolation bridge 5, and the tangential width rib of the rib 12 is an important design parameter. The larger the tangential width rib is, the smaller the magnetic resistance is, the larger the quadrature axis inductance is, the smaller the difference between the quadrature axis inductance and the direct axis inductance and the salient pole ratio are, and the smaller the magnetic resistance torque and the power factor are; on the contrary, if the width rib is smaller, the mechanical strength of the rotor 2 is reduced, the rotor cannot be suitable for operation in high-speed occasions, and the processing technology requirement and the cost are correspondingly increased. Therefore, the width rib is selected to be 1mm in consideration of the mechanical strength required for the rotor 2 in a high-speed operation state and the ease of the processing of the rotor 2.
Taking the structure of one group of magnetic barriers in fig. 3 as an example, the center line direction of the permanent magnet 3 along the diameter direction is the y-axis direction, and the x-axis direction is the center line direction of the permanent magnet 3 in the adjacent group of magnetic barriers. And the distance h between the two layers of permanent magnets 3 in each group of magnetic barriers is the same along the diameter direction.
The radial thickness of the permanent magnet 3 in the inner layer magnetic barrier is w1Tangential length of d1The radial thickness of the permanent magnet 3 in the intermediate layer barrier is w2Tangential length of d2The radial thickness of the permanent magnet 3 in the outer layer magnetic barrier is w3Tangential length of d3The radial distance from the center of the inner side surface of the permanent magnet 3 in the inner layer magnetic barrier to the center O of the rotating shaft 6 is s, and the radius of the rotor 2 is R. The permanent magnets 3 embedded in the rotor 2 are very beneficial to the improvement of the performance of a motor and a system, but the main problems are that the consumption of the permanent magnets 3 is proper, the consumption of the permanent magnets 3 is too small, the auxiliary significance and the contribution to the performance are limited, the consumption of the permanent magnets 3 is too large, the low-speed torque capacity is beneficial, and the high-speed operation are realizedThe constant power operation capability is disadvantageous, and therefore, the permanent magnet flux linkage design is very important for fully exerting the comprehensive performance advantages of the permanent magnet auxiliary type bearingless synchronous reluctance motor. In order to ensure the stability of the bearingless motor during high-speed operation and reduce the manufacturing cost of the motor, the amount of the permanent magnet is reduced under the condition of ensuring the torque capacity when the size of the permanent magnet 3 is designed. Therefore, the radial thickness and the tangential length of the permanent magnets 3 in the three layers of magnetic barriers decrease from inside to outside along the radial direction of the rotor 2, that is: d3<d2<0.75d1、w3<w2<w1。
Two magnetic isolation bridges 5 in each layer of magnetic barrier are symmetrically distributed about the x axis or the y axis, namely about the center line of the permanent magnet 3 in the diameter direction, and one of the magnetic isolation bridges 5 is taken as an example: referring to the inner-layer magnetic barrier shown in fig. 4, the radial contour line of each magnetic isolation bridge 5 includes a magnetic isolation bridge outer boundary line 22, a magnetic isolation bridge inner boundary line 23 and a magnetic isolation bridge end portion 24, two ends of the magnetic isolation bridge end portion 24 are respectively connected with the magnetic isolation bridge outer boundary line 22 and the magnetic isolation bridge inner boundary line 23, and the radial contour line of the magnetic isolation bridge 5 is equally divided into inner and outer half contour lines by the magnetic isolation bridge center line 21.
Referring to FIG. 5, the centerline 21 of the magnetic isolation bridge is a quadratic function curve PFT1Upper curve segment, quadratic function curve PFT1Vertex P of2At a vertical distance d from the y-axis1And/2 + rib, rib is the tangential width of the layer of ribs 12. Vertex P2At a vertical distance w from the x-axis1S is the radial distance of the center of the inner surface of the layer of permanent magnets 3 from the center O of the rotating shaft 6, w1Is the radial thickness of the layer of permanent magnets 3. Through the vertex P2And the axis parallel to the y-axis is the curve of the quadratic function PFT1Axis of symmetry YL1Axis of symmetry YL1Perpendicular to the x-axis.
At an angle alpha to the x-axis1Determine the end point P of the magnetic-isolating bridge central line 21 in the radial direction1End point P1A preset radius R with a constant distance from the center O of the rotating shaft 6FX，RFXR-1, R is the radius of the rotor 2. End point P1Curve P about a quadratic functionFT1Axis of symmetry YL1Is point P1sThus, point P1Point P1sPerpendicular to the x-axis at a distance RFX*sinα1Point P1At a vertical distance R from the y-axisFX*cosα1Point P1sAt a distance R from the y-axisFX*cosα1-(d 12+ rib). From point P1、P2、P1sDetermining a quadratic function curve PFT1Curve of quadratic function PFT1The functional expression of (a), (b), (c) is:
y(x)＝c0+c1·x+c2·x2，
in the above formula, x is the vertical distance between each point on the curve and the y-axis, y (x) is the vertical distance between each point on the curve and the x-axis, and x and y (x) represent variables. Point P1、P1s、P2The distances from the x-axis and the y-axis are substituted into the above formula to obtain c0、c1、c2Are all constants. c. C0As constant terms in the expression of a quadratic function, c1Coefficient of first order of variable x in a quadratic function expression, c2Is the coefficient of the quadratic term of variable x in the quadratic function expression.
Thus, the middle line 21 of the magnetic isolation bridge is a quadratic function curve PFT1Upper starting at point P2Ends at the end point P1Thereby obtaining a quadratic function curve expression y of the outer boundary line 22 of the magnetic shield bridge1(x) Quadratic function curve expression y of boundary line 23 in magnetic separation bridge2(x) Respectively as follows:
in the above formula, x is the vertical distance between each point on the curve and the y-axis, y1(x) Is the perpendicularity between each point on the outer boundary line of the magnetic isolation bridge and the x axisDistance, y2(x) Is the vertical distance between each point on the inner boundary line of the magnetic isolation bridge and the x axis, x and y1(x)、y2(x) Represents a variable. c. C0、c1、c2Homodyne constant, and quadratic function curve PFT1The meanings and values in the functional expression y (x) are consistent.
Starting point P of outer boundary line 22 of magnetic isolation bridge2HAnd a starting point P of the inner boundary line 23 of the magnetic isolation bridge2LPerpendicular distance from y axis and starting point P of magnetic isolation bridge middle line 212The vertical distances to the y-axis are the same and are all d1/2+rib2. Are all located on the symmetry axis Y of the quadratic function curveL1Upper, starting point P2HAt a vertical distance w from the x-axis1+ s, starting point P2LThe perpendicular distance from the x-axis is s. End point P of outer boundary line 22 of magnetic isolation bridge1HDistance from x-axis and end point P of magnetic isolation bridge middle line 211The same distance from the x-axis is obtained by the above formula
The end point P can be calculated1HPerpendicular to the y-axis, formula c0、c1、c2、w1Is constant, knowing the end point P1HThe vertical distance between the X axis and the X axis is substituted into a formula to obtain the end point P1HDistance from the y-axis. End point P of boundary line 23 in magnetic isolation bridge1LDistance from y axis and end point P of magnetic isolation bridge midline 211The same vertical distance from the y-axis, as given by the above formula
Calculating the end point P1LPerpendicular to the x-axis, in the formula c0、c1、c2、w1Is constant, knowing the end point P1LThe vertical distance between the Y axis and the Y axis is substituted into a formula to obtain the end point P1LDistance from the x-axis. Therefore, the outer boundary 22 of the magnetic shield bridge is of the formula
Is confirmed byStarting from point P on the curve of the determined quadratic function2HTerminating at a point P1HThe curve segment of the quadratic function of the magnetic separation bridge, the inner boundary line 23 of the magnetic separation bridge is of the formula
Starting from point P on the determined quadratic function curve2LTerminating at a point P1LThereby obtaining the structure of the magnetic isolation bridge 5. And the other magnetic isolation bridge 5 in the same layer of magnetic barrier and the magnetic isolation bridge 5 are symmetrically distributed about the y axis. The structure of the magnetic isolation bridge 5 in the magnetic barriers of the other layers is obtained by the same method as the structure shown in FIG. 5.
The included angle between the end point of the middle line of the magnetic isolation bridge of the middle layer magnetic barrier and the x axis is alpha2The included angle between the end point of the middle line of the magnetic isolation bridge of the outer layer magnetic barrier and the x axis is alpha3And satisfy α3>α2>α1。
Referring to fig. 6, the magnetic shield bridge end 24 is composed of two Bezier (Bezier) cubic curves. Straight line BTL、BLLAnd a straight line BELAre auxiliary lines required in the design process. The extension line of the outer boundary 22 of the magnetic isolation bridge is a straight line BTLStraight line BTLPassing through the end point P1HThe extension line of the inner boundary 23 of the magnetic isolation bridge is a straight line BLL. On a straight line BTLAbove, an end point P is selected which is spaced from the outer boundary 22 of the magnetic shield bridge1HA distance S1PPoint S ofH1. In the same way, on line BLLAlso, an end point P is selected which is spaced from the inner boundary 23 of the magnetic bridge1LA distance S1PPoint S ofL1。
Straight line BTLThe included angle between the positive direction of the x axis and the positive direction of the x axis is delta, the value range of the angle delta is 0-45 degrees, and the specific value can be reasonably selected and designed according to the actual situation. Straight line BELEnd point P passing through the center line 21 of the magnetic isolation bridge1And is aligned with the straight line BTLAnd a straight line BLLIntersecting, wherein the included angle between the X-axis and the X-axis in the negative direction is beta, the value range of the angle beta is 0-30 degrees, and the specific value can be reasonably selected and designed according to the actual situation. On a straight line BELAt end point P1On both sides of (A), each selecting a distance end point P1Is S2PRespectively, is a point S close to one side of the outer boundary 22 of the magnetic isolation bridgeH2And a point S near the inner boundary 23 of the magnetic shield bridgeL2。
The outer half contour line of the magnetic bridge end 24 passes through the above-mentioned four points P in the plane1H、SH1、SH2、P1From four points P in a plane1H、SH1、SH2、P1The method is characterized in that a Bezier cubic curve is obtained, the Bezier cubic curve can be determined by four points in a plane, is a parameter curve commonly used in engineering application, can be drawn by drawing software and is an intelligent vector line. The Bezier cubic curve starts at the end point P1HTrend point SH1Then passes through point SH2Later to point P1. Point SH1Point SH2And angle beta provides directional information for the curve, end point P1HAnd point SH1A distance S between1PDetermining that the curve is advancing to SH2Front, run towards SH1How long the length of the direction is, the final curve ending at point end P1. The inner half contour of the magnetic-isolating bridge end 24 is similar in structure to the outer half contour, and the Bezier cubic curve of the inner half contour passes through four points P in the plane1L、SL1、SL2、P1And (6) obtaining. This results in the entire magnetic shield end 24. Similarly, the structures of the magnetic isolation bridge end parts 24 in the magnetic barriers of the other layers are similar.
During manufacturing, the design parameters of the motor are determined firstly, and the value range of each design parameter is selected through a finite element method. Then, sensitivity analysis is carried out on each parameter, weight distribution needs to be carried out on each target during sensitivity analysis, the weight of torque pulsation and suspension force pulsation is 0.4, the power factor is 0.2, after the sensitivity analysis is carried out on each parameter, the parameter with lower sensitivity is directly obtained by a finite element method, the parameter with medium sensitivity is optimized by adopting a response surface, and the parameter with higher sensitivity is optimized by adopting a genetic algorithm. After the optimization is completed, a comprehensive optimal solution is selected, electromagnetic performance and suspension performance before and after the optimization are compared, final parameters are determined, and the motor is manufactured, so that torque pulsation and suspension force pulsation can be reduced.
Claims (6)
1. The utility model provides a permanent magnetism auxiliary type does not have bearing synchronous reluctance motor's rotor structure, the coaxial cover in rotor center has pivot (6), characterized by: four groups of magnetic barriers are uniformly and symmetrically arranged on the rotor along the circumferential direction, each magnetic barrier is divided into an inner layer, an intermediate layer and an outer layer from inside to outside, each magnetic barrier comprises a rectangular permanent magnet mounting groove (4), two magnetic isolation bridges (5) which are symmetrically distributed about the central line of the diameter direction of the permanent magnet mounting groove (4) and two rib parts (12) between the permanent magnet mounting groove (4) and the magnetic isolation bridges (5), a permanent magnet (3) is fixedly embedded in the permanent magnet mounting groove (4) in each magnetic barrier, the permanent magnets (3) are magnetized in parallel along the radial central line direction of the permanent magnets, and the magnetizing directions of two adjacent groups of permanent magnets (3) are opposite; the radial contour line of each magnetic isolation bridge (5) comprises a magnetic isolation bridge outer boundary line (22), a magnetic isolation bridge inner boundary line (23) and a magnetic isolation bridge end portion (24), the two ends of the magnetic isolation bridge end portion (24) are respectively connected with the magnetic isolation bridge outer boundary line (22) and the magnetic isolation bridge inner boundary line (23), the radial contour line of the magnetic isolation bridge (5) is divided into inner and outer half contour lines by a magnetic isolation bridge center line (21), the magnetic isolation bridge outer boundary line (22), the magnetic isolation bridge inner boundary line (23) and the magnetic isolation bridge center line (21) are quadratic function curve segments, and the magnetic isolation bridge end portion (24) is composed of two Bezier cubic curves.
2. The rotor structure of a permanent magnet assisted bearingless synchronous reluctance machine as claimed in claim 1, wherein: the center line direction of the permanent magnet (3) along the diameter direction is the y-axis direction, the x-axis direction is the center line direction of the permanent magnet (3) in the adjacent group of magnetic barriers, two magnetic isolation bridges (5) in each layer of magnetic barriers are symmetrically distributed about the x-axis or the y-axis, and the distance between the two layers of permanent magnets (3) in each group of magnetic barriers along the diameter direction is the same; the middle line (21) of the magnetic isolation bridge is a quadratic function curve PFT1Upper curve segment, quadratic function curve PFT1Vertex P of2At a vertical distance d from the y-axis1/2+rib，d1Is the tangential length of the permanent magnet (3) in the layer of the barrier, rib is the tangential width of the rib (12) in the layer of the barrier, and the apex P2And the x axisHas a vertical distance w between1S is the radial distance of the center of the inner side surface of the layer of permanent magnet (3) from the center O of the rotating shaft (6), w1Is the radial thickness of the layer of permanent magnets (3) passing through the apex P2And the axis parallel to the y-axis is the curve of the quadratic function PFT1Axis of symmetry YL1Axis of symmetry YL1Perpendicular to the x-axis; curve P of quadratic functionFT1End point P of1The distance from the center O of the rotating shaft (6) is a radius RFX，RFXR-1, R being the radius of the rotor, end point P1Curve P about a quadratic functionFT1Axis of symmetry YL1Is point P1s(ii) a The included angle between the end point of the middle line (21) of the magnetic isolation bridge of the inner layer magnetic barrier and the x axis is alpha1The included angle between the end point of the middle line (21) of the magnetic isolation bridge of the middle layer magnetic barrier and the x axis is alpha2The included angle between the end point of the middle line (21) of the magnetic isolation bridge of the outer layer magnetic barrier and the x axis is alpha3And satisfy α3>α2>α1。
3. The rotor structure of a permanent magnet assisted bearingless synchronous reluctance machine as claimed in claim 2, wherein: the starting point P of the outer boundary line (22) of the magnetic isolation bridge2HAnd a starting point P of the inner boundary line (23) of the magnetic isolation bridge2LPerpendicular distance between the magnetic shield and the y axis and the starting point P of the middle line (21) of the magnetic shield bridge2The vertical distances to the y-axis are the same and are all d1/2+rib2All are located on the symmetry axis Y of the quadratic function curveL1Upper, starting point P2HAt a vertical distance w from the x-axis1+ s, starting point P2LA perpendicular distance s from the x-axis, and an end point P of the outer boundary line (22) of the magnetic shield bridge1HThe distance between the magnetic shield and the x axis and the end point P of the middle line (21) of the magnetic isolation bridge1The distance between the magnetic isolation bridge and the x axis is the same, and the end point P of the boundary line (23) in the magnetic isolation bridge1LThe distance between the magnetic shield and the y axis and the end point P of the middle line (21) of the magnetic isolation bridge1The same vertical distance from the y-axis.
4. The rotor structure of a permanent magnet assisted bearingless synchronous reluctance machine as claimed in claim 3, wherein: extension of the outer boundary line (22) of the magnetic shield bridgeThe line is a straight line BTLStraight line BTLPassing through the end point P1HThe extension line of the inner boundary line (23) of the magnetic isolation bridge is a straight line BLLStraight line BTLSelecting an end point P of the magnetic bridge from the outer boundary line (22)1HA distance S1PPoint S ofH1(ii) a On a straight line BLLSelecting an end point P of the magnetic bridge from the inner boundary line (23)1LA distance S1PPoint S ofL1(ii) a Straight line BTLThe included angle between the positive direction of the x axis and the x axis is 0-45 degrees, and a straight line BELAnd a straight line BTLStraight line BLLAn end point P intersecting and passing through the middle line (21) of the magnetic isolation bridge1And the included angle between the X-axis and the X-axis in the negative direction is 0-30 degrees and is on a straight line BELEnd point P of1On both sides of (A), each selecting a distance end point P1Is S2PThe outer half contour line of the magnetic-isolating bridge end part (24) passes through four points P1H、SH1、SH2、P1The Bezier cubic curve of (1) is that the inner half contour line of the magnetic isolation bridge end part (24) passes through four points P1L、SL1、SL2、P1Bezier cubic curve of (1).
5. The rotor structure of a permanent magnet assisted bearingless synchronous reluctance machine as claimed in claim 1, wherein: the radial thickness of the permanent magnet (3) in the inner layer magnetic barrier is w1Tangential length of d1The radial thickness of the permanent magnet (3) in the middle layer magnetic barrier is w2Tangential length of d2The radial thickness of the permanent magnet (3) in the outer layer magnetic barrier is w3Tangential length of d3，d3<d2<0.75d1、w3<w2<w1。
6. The rotor structure of a permanent magnet assisted bearingless synchronous reluctance machine as claimed in claim 1, wherein: the tangential width of the rib (12) is 1 mm.
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| CN112152356B (en) * | 2020-08-28 | 2022-07-08 | 浙江零跑科技股份有限公司 | Permanent magnet auxiliary synchronous reluctance motor for electric automobile |
| CN112615515A (en) * | 2020-12-04 | 2021-04-06 | 南京航空航天大学 | Bilateral dislocation magnetic barrier permanent magnet auxiliary reluctance synchronous linear motor |
| CN113626985B (en) * | 2021-07-13 | 2023-10-24 | 的卢技术有限公司 | Method and device for generating motor rotor structure, computer equipment and storage medium |
| CN114091330B (en) * | 2021-11-16 | 2024-05-14 | 韩建国 | Medium-high speed magnetic gear optimization design method of high-power wind electromagnetic gear box |
| CN114448122B (en) * | 2022-04-07 | 2022-06-14 | 江苏慧马科技有限公司 | Reluctance motor rotor structure, reluctance motor and rotor machining method |
| WO2024116846A1 (en) * | 2022-11-28 | 2024-06-06 | パナソニックＩｐマネジメント株式会社 | Bearingless motor |
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