WO2021192223A1 - Rotor solide, machine électrique tournante à induction à cage d'écureuil et procédé de conception de machine électrique tournante à induction à cage d'écureuil - Google Patents

Rotor solide, machine électrique tournante à induction à cage d'écureuil et procédé de conception de machine électrique tournante à induction à cage d'écureuil Download PDF

Info

Publication number
WO2021192223A1
WO2021192223A1 PCT/JP2020/014028 JP2020014028W WO2021192223A1 WO 2021192223 A1 WO2021192223 A1 WO 2021192223A1 JP 2020014028 W JP2020014028 W JP 2020014028W WO 2021192223 A1 WO2021192223 A1 WO 2021192223A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotor
slot
slots
electric machine
stator
Prior art date
Application number
PCT/JP2020/014028
Other languages
English (en)
Japanese (ja)
Inventor
雄一 坪井
米谷　晴之
Original Assignee
東芝三菱電機産業システム株式会社
三菱電機株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 東芝三菱電機産業システム株式会社, 三菱電機株式会社 filed Critical 東芝三菱電機産業システム株式会社
Priority to PCT/JP2020/014028 priority Critical patent/WO2021192223A1/fr
Priority to JP2020555249A priority patent/JP7168680B2/ja
Publication of WO2021192223A1 publication Critical patent/WO2021192223A1/fr

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K17/00—Asynchronous induction motors; Asynchronous induction generators
    • H02K17/02—Asynchronous induction motors
    • H02K17/16—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors

Definitions

  • the present invention relates to a massive rotor, a squirrel-cage induction rotary electric machine having the lump rotor, and a method for designing a squirrel-cage induction rotary electric machine.
  • the induction rotary electric machine has restrictions such as not being able to adjust the power factor like the synchronous rotary electric machine, but has the advantage of having a simpler structure than the synchronous rotary electric machine.
  • the induction rotary electric machine generally includes a winding type induction rotary electric machine and a cage type induction rotary electric machine.
  • the cage-type induction rotary electric machine does not require an electrical connection with the outside like the winding-type induction rotary electric machine, and has a simpler structure than the winding-type induction rotary electric machine.
  • control on the power supply side has become easier due to the development of semiconductors for electric power, so a method combined with this has come to be widely used.
  • a plurality of rotor slots are formed in the vicinity of the radial surface of the rotor core, which are arranged at intervals in the circumferential direction and penetrate in the axial direction.
  • a conductor bar penetrates each rotor slot, and the conductor bars are electrically connected to each other by a short-circuit ring on the axially outer side of the rotor core.
  • the rotor slot is formed in the direction from the surface side of the rotor core toward the rotation axis of rotation, and its cross-sectional shape is, for example, a shape close to a rectangle (see Patent Document 1) or a shape close to an oval shape. (See Patent Document 2).
  • the rotor is generally configured by attaching a rotor shaft and a rotor core composed of laminated plates to the outside in the radial direction of the rotor shaft.
  • the laminated plates are electrically insulated from each other, no eddy current is generated in the axial direction.
  • a cage-type induction rotary electric machine having a rotor core made of a laminated plate as described above, a technique for reducing heat generation in the rotor by suppressing heat generation in the conductor bar of the rotor is known (patented). Reference 4).
  • the massive rotor has a simpler structure than the laminated rotor and has excellent mechanical strength, but it also generates an eddy current in the axial direction, so the loss is larger than that of the laminated rotor. Become. As a result, there is a problem that the temperature of the surface of the rotor core rises.
  • an object of the present invention is to suppress an increase in the surface temperature of the rotor core portion of the massive rotor while reducing the cost increase in the cage-shaped induction rotary electric machine having the massive rotor.
  • the massive rotor according to the present invention is a massive rotor used in a cage-shaped induction rotary electric machine, and includes a shaft portion extending in the axial direction and rotatably supported, and the shaft portion.
  • a columnar rotor core portion formed coaxially integrally, having a diameter larger than that of the shaft portion, arranged at intervals in the circumferential direction, and extending in the axial direction, and the rotation. It has a plurality of conductor bars penetrating the inside of the child slot and connecting to each other on both outer sides of the rotor core portion in the axial direction, and the two walls of the rotor slot facing each other are the shaft portion. It is tilted by a predetermined angle or more in the circumferential direction with respect to the plane including the rotation axis of And non-existent regions are arranged alternately in the circumferential direction.
  • the cage-shaped induction rotary electric machine includes the above-mentioned massive rotor, a cylindrical stator core provided on the radial outer side of the rotor core portion, and a radial inner side of the stator core.
  • a stator having a stator winding formed on the surface at intervals in the circumferential direction and penetrating the inside of a plurality of stator slots extending in the axial direction, and a stator in the axial direction with the rotor core portion interposed therebetween. It is characterized by including two bearings that support the massive rotor on both sides of the shaft portion.
  • the method for designing a cage-shaped induction rotary electric machine is a method of designing a massive rotor having a shaft portion and a rotor core portion, and fixing provided outside the rotor core portion in the radial direction.
  • a method of designing a cage-type induction rotary electric machine including a child which is a method of designing a plurality of stator slots formed on the radial inner surface of the stator, arranged at intervals in the circumferential direction, and penetrating in the axial direction.
  • stator condition setting step for setting the dimensions and the pitch in the circumferential direction and the stator condition setting step are formed on the radial outer surface of the rotor core portion and arranged at intervals in the circumferential direction.
  • the thinning step of forming the rotor slots which does not form the rotor slots at the same rank from each of the k sets having more than three adjacent to each other, and the rotation when viewed from the rotation axis.
  • a rotor slot position readjustment step that adjusts the position of the rotor slot so that the overlap angle of each of the plurality of conductor bars adjacent to each other that remains as a result of the thinning step of forming the child slot is reduced. It is characterized by.
  • FIG. 3 is a cross-sectional view of a third conceptual part for explaining the relationship between the stator slot and the rotor slot of the squirrel-cage induction rotary electric machine according to the embodiment. It is a partial cross-sectional view explaining the rotor slot inclination angle of the dense type rotor which concerns on embodiment.
  • FIG. 5 is a conceptual partial cross-sectional view illustrating the effect of the dense rotor according to the embodiment. It is a conceptual graph for demonstrating the relationship between the rotor slot inclination angle of the dense rotor which concerns on embodiment, and the evaluation function value. It is a flow chart which shows the procedure of the design stage of a massive rotor in the design method of the squirrel-cage induction rotary electric machine which concerns on embodiment. It is a partial cross-sectional view explaining the thinning-out step of rotor slot formation in the design stage of a massive rotor in the design method of the squirrel-cage induction rotary electric machine which concerns on embodiment. FIG.
  • FIG. 5 is a partial cross-sectional view illustrating a step of readjusting the rotor slot position after thinning out the rotor slot formation in the design stage of the massive rotor in the design method of the squirrel-cage induction rotary electric machine according to the embodiment. It is a graph which conceptually explains the effect of the design method of a massive rotor in the design method of the squirrel-cage induction rotary electric machine which concerns on embodiment.
  • FIG. 1 is a vertical cross-sectional view showing the configuration of a squirrel-cage induction rotary electric machine according to an embodiment.
  • the cage-shaped induction rotary electric machine 100 has a massive rotor 10, a stator 20, a bearing 30, a frame 40, and a cooler 51.
  • the massive rotor 10 is a massive magnetic pole type rotor in which a rotor core is integrated with a rotor shaft for the purpose of further improving mechanical strength, and is an integrated rotor 11, a plurality of conductor bars 16, and two. It has a short-circuit ring 17.
  • the integrated rotor 11 has a shaft portion 12 which corresponds to a rotor shaft and a rotor core portion 13 which corresponds to a rotor core, and these are coaxially integrated. That is, the integrated rotor 11 has a shape that is a combination of cylindrical shapes having different diameters in the rotation axis direction (hereinafter, axial direction). Around the center of the integrated rotor 11 in the axial direction, a columnar shape having a large diameter forms a rotor core portion 13. Shaft portions 12 having a diameter smaller than that of the rotor core portion 13 are formed on both sides in the axial direction with the rotor core portion 13 interposed therebetween.
  • the shaft portions 12 on both sides of the integrated rotor 11 in the axial direction are rotatably supported by bearings 30, respectively.
  • An inner fan 18 is provided in a portion between the rotor core portion 13 and the bearing 30 of each shaft portion 12.
  • the plurality of conductor bars 16 penetrate the vicinity of the radial surface of the rotor core portion 13 at intervals in the circumferential direction and extend in the axial direction. Each conductor bar 16 projects to both outer sides of the rotor core portion 13 in the axial direction. On the outer side of each of the rotor core portions 13 in the axial direction, the plurality of conductor bars 16 on the same side protrude from each other by the same length. Further, the plurality of conductor bars 16 are electrically and mechanically coupled to each other by electrically and mechanically coupling the ends of the plurality of conductor bars 16 to the annular short-circuit ring 17. While the material of the rotor core portion 13 is steel or low alloy steel, the conductor bar 16 and the short-circuit ring 17 are made of a material having a higher conductivity than the rotor core portion 13 such as copper or aluminum. It is used.
  • the stator 20 has a stator core 21 and a plurality of stator windings 24.
  • the stator core 21 is provided on the radial outer side of the rotor core portion 13 of the massive rotor 10 via an annular gap 25.
  • the stator core 21 has a cylindrical shape, and the stator winding 24 penetrates the vicinity of the inner surface of the stator core 21.
  • the frame 40 houses the stator 20 and the rotor core portion 13.
  • Bearing brackets 35 are provided at both ends of the frame 40 in the axial direction. Each of the bearing brackets 35 statically supports the bearing 30.
  • a cooler 51 is provided above the frame 40 and is housed in the cooler cover 52.
  • the cooler cover 52 forms a closed space 61 together with the frame 40 and the two bearing brackets 35.
  • the inside of the closed space 61 is filled with a cooling gas such as air, and the cooling gas circulates in the closed space 61 by the inner fan 18.
  • the space inside the cooler cover 52 and the space inside the frame 40 constituting the closed space 61 are the cooler inlet opening 62 formed above the stator 20 and the cooling formed above the respective inner fans 18. It communicates with the vessel outlet opening 63.
  • FIG. 2 is a cross-sectional view showing the massive rotor 10 and the stator slot of the squirrel-cage induction rotary electric machine according to the embodiment.
  • a plurality of groove-shaped rotor slots 14 having a width d extending in the axial direction are formed on the radial surface of the rotor core portion 13 so as to be spaced apart from each other in the circumferential direction.
  • a conductor bar 16 penetrates through each rotor slot 14.
  • Each rotor slot 14 has an outer wall 14a, an inner wall 14b, and a radial innermost wall 14c that extend axially and face each other and are parallel to each other.
  • the innermost wall 14c is formed in a curved shape in the cross section of the rotor slot 14. In the radial direction, each rotor slot 14 is formed to a depth of up to the inscribed circle 14d.
  • the shapes and dimensions of the cross sections of the conductor bar 16 and the rotor slot 14 are almost the same as each other.
  • the conductor bar 16 has a flat plate shape that is long in the axial direction.
  • the conductor bar 16 can be fitted into the rotor slot 14 from the outside in the radial direction of the rotor slot 14.
  • the portions of the conductor bar 16 facing the outer wall 14a, the inner side wall 14b, and the innermost wall 14c are wrapped with silver wax foil, and then the rotor slot 14 is used. It can be inserted and melted.
  • a method may be adopted in which the conductor bar 16 is inserted into the rotor slot 14 and then TIG welding is performed from the outside, or the conductor bar 16 and the rotor slot 14 are pressed against each other.
  • each of the plurality of conductor bars 16 has a shape that becomes a part of a cylindrical shape that wraps the radial outer surface of the rotor core portion 13, that is, the radial outer side of the rotor core portion 13. It is formed in a shape that is continuous with the surface. It should be noted that the present invention is not limited to this, and for example, the radial outer side is partially retracted radially inward from the above cylindrical shape by making the radial outer end of the conductor bar perpendicular to both sides of the conductor bar. It may be the case.
  • the conductor bar 16 has been described as an example in which the conductor bar 16 can be fitted into the rotor slot 14 from the outside in the radial direction of the rotor slot 14, but it can also be inserted from the axial end of the rotor core portion 13. good.
  • the conductor bar 16 is not flat, but has a maximum thickness or a minimum thickness in the middle of the width direction, and the cross-sectional shape of the rotor slot 14 is also formed so as to fit with the conductor bar 16. It may be made to resist centrifugal force.
  • the rotor slot 14 is not formed along the direction outward from the rotation axis in the radial direction, but is inclined in the circumferential direction.
  • the angle of each conductor bar 16 housed in the rotor slot 14 in the circumferential direction when viewed from the rotation axis Z of the massive rotor 10 is defined as the inscribed angle ⁇ 1. Further, the angle in the circumferential direction when the region in the circumferential direction in which the conductor bar 16 does not exist is viewed from the rotation axis Z of the massive rotor 10 is defined as the inscribed angle ⁇ 2.
  • the existing regions and the non-existing regions of the conductor bars 16 are alternately arranged in the circumferential direction when viewed from the rotation axis Z, and the arrangement is as follows. There are various characteristics.
  • the first feature is that a plurality of conductor bars 16 are adjacent to each other in the circumferential direction in the circumferential region where the conductor bars 16 exist.
  • the regions of the inscribed angle ⁇ 1 of each conductor bar 16 are adjacent to each other so as not to be separated from each other and to overlap each other. That is, when viewed from the rotation axis Z, the conductor bars 16 adjacent to each other are sequentially arranged for each inscribed angle ⁇ 1.
  • the same number of rotor teeth 15 as the rotor slots 14 are formed so as to be arranged at intervals in the circumferential direction.
  • stator winding conductor 24a penetrates each stator slot 22, and the stator winding conductor 24a forms the stator winding 24.
  • FIG. 3 is a flow chart showing the procedure of the design method of the squirrel-cage induction rotary electric machine according to the embodiment.
  • the design method of the cage-type induction rotary electric machine includes a design stage S100 of the dense rotor 90 and a design stage S200 of the massive rotor 10.
  • the dense rotor 90 refers to an intermediate stage in the process of deriving the massive rotor 10 according to the present embodiment.
  • FIG. 4 is a flow chart showing the procedure at the design stage of the dense rotor 90 (FIG. 9). That is, the procedure of the design method for evaluating the optimum range of the circumferential pitch and the tilt angle ⁇ (hereinafter, the rotor slot tilt angle ⁇ ) of the rotor slot 14 and obtaining the dense rotor 90 is shown. ..
  • the conditions of the stator slot 22 such as the dimensions of the stator slot 22 and the pitch in the circumferential direction are set (step S101).
  • the dimensions of the stator winding conductor 24a penetrating the stator slot 22 are also set according to the setting of the conditions.
  • step S102 the conditions of the rotor slot 14 such as the dimensions of the rotor slot 14 and the pitch in the circumferential direction are set.
  • the rotor slot tilt angle ⁇ is set (step S103).
  • the dimensions and shape of the conductor bar 16 penetrating the rotor slot 14 are also set according to the setting of the conditions.
  • step S104 the loss in the rotor core portion 13 of the dense rotor 90 is calculated.
  • step S105 the temperature distribution of the rotor core portion 13 is calculated based on the calculated loss.
  • step S106 the stress distribution of the rotor core portion 13 is calculated.
  • step S107 it is determined whether or not the procedure up to step S106 has been completed over the range to be examined for the rotor slot inclination angle ⁇ (step S107).
  • the range to be examined for the rotor slot inclination angle ⁇ is the range from ⁇ smin to ⁇ smax
  • ⁇ smin is an angle larger than 0 degrees
  • ⁇ smax is an angle smaller than 90 degrees.
  • ⁇ smin may be 10 degrees
  • ⁇ smax may be 80 degrees
  • the like may be a wide range to some extent, or the range may be further narrowed.
  • step S107 NO If it is determined that the procedure up to step S106 has not been completed over the range to be examined for the rotor slot tilt angle ⁇ (step S107 NO), the process returns to step S103 and the rotor slot tilt angle ⁇ is changed. The steps up to step S106 are carried out.
  • step S106 If it is determined that the procedure up to step S106 has been completed over the range to be examined for the rotor slot tilt angle ⁇ (YES in step S107), then the step is performed over the range to be examined for the pitch of the rotor slot 14. It is determined whether or not the procedure up to S106 is completed (step S108). If it is determined that the procedure up to step S106 has not been completed over the range to be examined regarding the pitch of the rotor slot 14 (step S108 NO), the process returns to step S102 and the pitch of the rotor slot 14 is changed. Step S106 is carried out.
  • step S108 When it is determined that the procedure up to step S106 has been completed over the range to be examined for the pitch of the rotor slot 14 (step S108 YES), the process proceeds to the next step S110.
  • the evaluation function is determined by the stage of step S110 (step S109).
  • the evaluation function is, for example, the evaluation function PI (n) as shown in the following equation (3) or equation (4) for minimizing the total generated stress and loss with respect to the number of rotor slots n, or the evaluation function. It is an evaluation function PI ( ⁇ , n 0 ) as shown by the equation (5) described later for minimizing the total generated stress and loss.
  • step S110 the number of rotor slots n and the rotor slot tilt angle ⁇ of the rotor slot 14 are determined based on the evaluation function set in step S109 (step S110).
  • the procedure of the design method of the dense rotor 90 shown in FIG. 4 has been described above, but the procedure of steps S102 to S108 includes the examination range of the predetermined rotor slot inclination angle ⁇ and the rotor slot 14. This is a survey within the examination range of the pitch or the number of rotor slots n corresponding thereto. Actually, the number of rotor slots n and the rotor slot inclination angle ⁇ of the rotor slot 14 are determined in steps S109 and S110 based on the survey results. The contents at this stage will be described below.
  • FIG. 5 is a graph showing a trial calculation example of the relationship between the number of rotor slots and the generated stress and loss in the dense rotor 90.
  • the horizontal axis represents the ratio of the number of rotor slots n to the reference number of rotor slots n 0.
  • the vertical axis is the ratio of generated stress based on the generated stress at the reference number of rotor slots n 0 (relative value) and the ratio of loss based on the loss at the reference number of rotor slots n 0 (relative value). ).
  • the curve shown by the dotted line shows the case where the slot width d of the rotor slot 14 is changed in inverse proportion to the number of slots of the rotor slot 14.
  • the curve shown by the alternate long and short dash line shows the case where the slot width d of the rotor slot 14 is fixed.
  • the generated stress indicates the stress at the base of the rotor teeth 15, which is the maximum in the stress distribution.
  • the curve shown by the solid line represents the ratio (relative value) of the loss based on the loss at the reference rotor slot number n 0. As shown in FIG. 5, the loss decreases as the number of rotor slots 14 increases. This point will be supplemented below with reference to FIGS. 6 to 8.
  • FIG. 6 is a cross-sectional view of the first conceptual part for explaining the relationship between the stator slot and the rotor slot of the cage-shaped induction rotary electric machine
  • FIG. 7 is a cross-sectional view of the second conceptual part
  • 8 is a cross-sectional view of the third conceptual part.
  • the display of the stator winding conductor 24a (FIG. 2) is omitted.
  • n be the number of rotor slots 14 and N be the number of stator slots 22.
  • FIG. 6 shows a case where the number of rotor slots n is equal to the number of stator slots N.
  • the circumferential intensity distribution (circumferential magnetic flux intensity distribution) of the magnetic flux formed by the current flowing through the stator winding 24 is a phase pitch corresponding to the distribution of the positions of the stator slots 22, in other words, a period. Therefore, for example, when the circumferential magnetic flux intensity distribution shown by the broken line in FIG. 6 occurs, it is the rotor of the conductor bar 16 that corresponds to the magnetic flux formed by the current flowing through the stator winding 24 (FIG. 1). It is a portion far from the surface of the iron core portion 13.
  • the second conceptual diagram of FIG. 7 shows a case where the number of rotor slots n is larger than the number of stator slots N.
  • the pitch of the arrangement of the rotor slots 14 is different from the period of the intensity distribution of the circumferential magnetic flux generated by the current flowing through the stator winding 24, that is, the pitch of the phase. Therefore, the time in which the magnetic flux permeates the conductor bar 16 in the portion close to the surface of the rotor core portion 13, that is, the time in which the interaction between the magnetic flux and the conductor bar 16 is strong always increases.
  • the third conceptual diagram of FIG. 8 shows a case where the number of rotor slots n is further increased and becomes twice the number of stator slots N.
  • the magnetic flux always permeates the portion of the conductor bar 16 close to the surface of the rotor core portion 13 in any phase, and the interaction between the magnetic flux and the conductor bar 16 continues to be strong.
  • stator winding 24 (FIG. 1) It is considered that the coupling between the magnetic flux generated by the above and the conductor bar 16 of the dense rotor 90 becomes stronger. This is a factor in reducing the loss.
  • the number of rotor slots n is larger than the number of stator slots N, and the condition of the following equation (2) is set to be satisfied.
  • the generated stress tends to increase as the number of rotor slots n of the rotor slots 14 increases, while the loss tends to decrease. That is, the generated stress and the loss tend to be opposite to each other as the number of slots of the rotor slot 14 increases.
  • S 0 be the stress generated when the number of rotor slots is n 0
  • L 0 be the loss.
  • n 0 is arbitrary.
  • S (n) the stress generated when the number of rotor slots is n
  • L (n) the loss
  • PIN (n) [S (n) / S 0 ] + p ⁇ [L (n) / L 0 ] ... (3)
  • the first evaluation function PIN (n) shown in the following equation (4) may be used.
  • PIN (n) [S (n) / S 0 ] ⁇ [L (n) / L 0 ] p ... (4)
  • S 0 and L 0 in the formulas (3) and (4) are arbitrary reference values.
  • the constant p is a constant for considering the mutual weight of the disadvantage due to the generated stress S (n) and the disadvantage due to the loss L (n), and is the purpose of the target rotating electric machine, the design margin, etc. Set in consideration of.
  • FIG. 9 is a partial cross-sectional view illustrating the rotor slot inclination angle ⁇ of the dense rotor 90 according to the embodiment.
  • a virtual surface 14s located in the same rotor slot 14 between the outer wall 14a and the inner wall 14b facing each other and parallel to each other.
  • the surface of the rotor core portion 13 in the radial direction is defined as a curved surface Sf.
  • the line of intersection between the curved surface Sf and the virtual surface 14s is defined as the line of intersection L0.
  • a plane passing through the rotor rotation shaft 11a and the line of intersection L0 is defined as a plane P.
  • the rotor slot 14 formed on the surface of the rotor core portion 13 of the dense rotor 90 is located in the circumferential direction. It is tilted. Further, the ratio of the number of rotor slots 14 to the number of stator slots 22 is larger than 1.1.
  • FIG. 10 is a conceptual partial cross-sectional view illustrating the effect of the dense rotor.
  • the two on the left side of the figure are the rotor slot 14 and the conductor bar 16 of the rotor core portion 13 according to the present embodiment. Further, on the right side, for comparison, a conventional rotor slot and a conductor bar having the same cross-sectional area as the conductor bar of the present embodiment are shown by broken lines.
  • the radius of the inscribed circle 14d of the rotor slot 14 in the present embodiment is larger than the radius of the inscribed circle Si0 of the conventional rotor slot. That is, the radial width ⁇ R1 of the rotor slot 14 according to the present embodiment is smaller than the radial width ⁇ R0 of the conventional rotor slot. Therefore, for example, the center position of each conductor bar 16 is close to the surface of the rotor core portion 13 as a whole, and the distance between the overall position (center position, etc.) in each conductor bar 16 and the stator winding 24. Is relatively short. ⁇ R1 is approximately ⁇ R0 ⁇ cos ⁇ .
  • iron loss occurs in the rotor core portion 13 having a relatively low conductivity as compared with the conductor bar 16, and the induced current flows particularly to the surface of the rotor core portion 13, so that the rotor core portion 13 has an iron loss.
  • the temperature of the surface of the portion 13 tends to rise.
  • the relatively short distance between the overall position of the conductor bar 16 and the stator winding 24 increases the coupling force due to the magnetic flux passing through the stator core 21 side and the conductor bar 16 and improves efficiency. Bring. As a result, the loss is reduced. Therefore, the increase in the surface temperature Ts of the rotor core portion 13 in the present embodiment can be suppressed to be lower than in the conventional case.
  • the ratio of the radial widths of the rotor slots 14 is, for example, at least about 5% to 10%. It seems that it needs to be reduced.
  • the value of cos ⁇ is 0.9 to 0.95, that is, ⁇ is 18 degrees to 26 degrees. Therefore, it is considered that at least the rotor slot inclination angle ⁇ needs to be at least about 20 degrees.
  • the centrifugal force F acting on the center of gravity M in the cross section of the conductor bar 16 is a component force Fh in the direction of pulling out the conductor bar 16 along the rotor slot 14, and the outer wall of the rotor slot 14 perpendicular to the component force Fh. It is decomposed into a component force Fw in the direction of acting on 14a.
  • the value of the component force Fh is Fcos ⁇ , which is smaller than the value of the centrifugal force F. Therefore, when the same level of pop-out prevention measures as before is taken, the amount of (F-Fcos ⁇ ) is a margin for pop-out prevention. Furthermore, what used to require large-scale equipment such as pressure welding does not require such large-scale equipment. For example, there may be cases where the same level of margin for pop-out prevention as before can be secured by measures to prevent pop-out such as brazing.
  • the value of the component force Fw in the direction acting on the outer wall 14a is Fsin ⁇ , and acts so as to bend the rotor teeth 15 in the circumferential direction and the rotor teeth 15 in the radial direction.
  • the stress distribution for the rotor teeth 15 produces a maximum value Smax at the base 15c of the rotor teeth 15. Therefore, the maximum value Smax is set to the rotor slot tilt angle within a range sufficiently smaller than the allowable stress.
  • the rotor is relaxed while relaxing the conditions for preventing the conductor bar 16 from coming off from the rotor slot 14.
  • the loss L which causes an increase in the surface temperature of the iron core portion 13, can be suppressed.
  • the efficiency is further improved by setting the number of the rotor slots 14 to be larger than 1.1 times the number of the stator slots 22. Therefore, it is possible to further suppress an increase in the surface temperature Ts of the rotor core portion 13.
  • FIG. 11 is a conceptual graph for explaining the relationship between the rotor slot tilt angle of the dense rotor 90 and the evaluation function value according to the embodiment.
  • the horizontal axis is the rotor slot tilt angle ⁇ .
  • the vertical axis shows the evaluation value of the loss L ( ⁇ , n 0 ) shown by the curve A0, the generated stress S ( ⁇ , n 0 ) shown by the curve B0, and the disadvantage evaluation function PI ⁇ ( ⁇ ) shown by the combined curve C0. , N 0 ) function value.
  • the generated stress S ( ⁇ , n 0 ) and the loss L ( ⁇ , n 0 ) are values with respect to the rotor slot inclination angle ⁇ when the number of rotor slots is n 0.
  • the disadvantage evaluation function PI ⁇ ( ⁇ , n 0 ) is expressed by the following equation (5).
  • n 0 is a value within the range of the number of rotor slots n obtained in the first step, that is, the minimization step of the equation (3) or the equation (4) with respect to the number of rotor slots n.
  • Treated as a parameter That is, in the second step, that is, in the step of minimizing the disadvantage evaluation function with respect to the rotor slot inclination angle ⁇ , each is treated as a constant value.
  • PI ⁇ ( ⁇ , n 0 ) [S ( ⁇ , n 0 ) / S 0 ] + q ⁇ [L ( ⁇ , n 0 ) / L 0 ] ... (6)
  • the evaluation function PI (n) the one shown in the following equation (7) may be used.
  • S 0 and L 0 are arbitrary reference values.
  • the constant q is a constant for considering the mutual weight of the disadvantage due to the generated stress S (n) and the disadvantage due to the loss L (n), as in the case of p in the first step, and is a target. Set in consideration of the purpose of the rotating electric machine or the design margin.
  • equations (3) and (4) in the first step and the equations (6) and (7) in the second step are examples and are not limited thereto. That is, if there is another index affected by the rotor slot 14 tilt angle ⁇ , it may be added to the variables of these equations. If the effect is negligible, it may be excluded from the variable in equation (2). Further, a function shape other than the above-mentioned form may be used.
  • the limit value HL for example, a loss L that gives the maximum temperature obtained by subtracting a predetermined margin from the upper limit of the temperature range in which the operation of the rotor core portion 13 can be continued is used.
  • the generated stress S ( ⁇ , n 0 ) is subject to the condition of the limit value HS or less and the rotor slot tilt angle ⁇ at this time is ⁇ 0max, the range of ⁇ ⁇ 0max and the rotor slot tilt angle ⁇ .
  • the limit value HS for example, a value obtained by subtracting a predetermined margin from the allowable stress of the material of the rotor core portion 13 is used.
  • the rotor slot tilt angle ⁇ satisfying the condition of ⁇ 0min ⁇ ⁇ 0max has the minimum value as shown by the solid line C0 in the example of FIG. 11, the rotor slot tilt angle ⁇ 0 that gives it is obtained.
  • the angle width ⁇ may be set to a value of, for example, about 5 degrees to 10 degrees, which is sufficiently larger than the manufacturing accuracy of the squirrel-cage induction rotary electric machine 100 including the formation of the rotor slot 14.
  • the rotor is relaxed while relaxing the conditions for preventing the conductor bar 16 from coming off from the rotor slot 14.
  • the increase in the surface temperature Ts of the iron core portion 13 can be suppressed, and further, the efficiency is further improved by setting the number of rotor slots 14 to be larger than 1.1 times the number of stator slots 22. .. Therefore, it is possible to further suppress an increase in the surface temperature Ts of the rotor core portion 13.
  • the number n of the rotor slots 14 and the inclination angle ⁇ of the rotor slots 14 are set to the optimum values based on indexes such as the generated stress S ( ⁇ , n 0 ) and the loss L ( ⁇ , n 0). be able to.
  • FIG. 12 is a flow chart showing the procedure of the design stage S200 of the massive rotor 10 in the design stage of the squirrel-cage induction rotary electric machine according to the embodiment.
  • the procedure for obtaining the massive rotor 10 according to the present embodiment is carried out based on the dense rotor 90 obtained in the design step S100 of the dense rotor 90.
  • the design stage S200 of the massive rotor 10 includes a thinning step S201 for forming the rotor slot and a readjustment step S202 for the rotor slot position after the thinning.
  • FIG. 13 is a partial cross-sectional view illustrating the thinning step S201 of rotor slot formation at the design stage of the massive rotor 10 in the design method of the squirrel-cage induction rotary electric machine according to the embodiment.
  • (A) shows the state before thinning, that is, the dense rotor 90.
  • (B) shows the state after thinning out.
  • rotor slot forming thinning step S201 a part of the rotor slot 14 formed in the dense rotor 90 obtained in the design step S100 of the dense rotor 90 is removed, that is, the rotor slot 14 is removed. Stop forming. This operation is referred to as thinning out of rotor slot formation.
  • the thinning of the rotor slot formation shall be performed regularly, and among the k rotor slots 14 that are continuously arranged in the 90-circumferential direction of the dense rotor, the rotor slots 14 at the same rank positions are thinned out. It shall be.
  • the first rotor slot 14 is thinned out counterclockwise.
  • k is assumed to be 3 or more. That is, in FIG. 13, k is 3, and when the pairs composed of C1, C2, and C3 are arranged in the circumferential direction, C1 is thinned out for each pair.
  • the same operation is sequentially performed for the set composed of the k rotor slots 14. Since the last set may not be k, if the number of rotor slots 14 in the last set is one, it is not thinned out, and if there are two or more, the rotor slots 14 of C1 are similarly used. It shall be thinned out. As a result, the rotor slots 14 to be thinned out exist at the same intervals in the circumferential direction except for the last set.
  • the conductor bars 16 remaining as a result of the thinning step S201 of rotor slot formation have an inscribed angle of ⁇ 1 as seen from the rotation axis Z (FIG. 2) and are adjacent to each other as seen from the rotation axis Z. Let the overlapping angle of the conductor bars 16 be ⁇ 1. At this time, with respect to the portion where the rotor slot 14 is thinned out, the inscribed angle ⁇ d of the portion where the conductor bar 16 does not exist when viewed from the rotation axis Z is ( ⁇ 1-2 ⁇ 1).
  • the number of rotor slots 14 is reduced to about (k-1) / k, and the cost required for forming the rotor slots 14 is reduced.
  • FIG. 14 is a partial cross-sectional view illustrating the readjustment step S202 of the rotor slot position after thinning in the design stage S200 of the massive rotor in the design method of the squirrel-cage induction rotary electric machine according to the embodiment.
  • (A) shows the state after thinning out, which is the same state as (b) in FIG.
  • FIG. 14B shows a state after the rotor slot position has been readjusted.
  • the position of the rotor slot 14 is further readjusted from the result obtained in the thinning step S201 of the rotor slot formation.
  • the readjustment method is performed by reducing the overlapping angle of the circumferential angles ⁇ 1 of the conductor bars 16 adjacent to each other as seen from the rotation axis Z from the overlapping angle ⁇ 1. In this case, the overlap angle is reduced to zero, but it may be reduced to an intermediate angle that is not reduced to zero.
  • the inscribed angles ⁇ 1 of the conductor bar 16 as seen from the axis of rotation Z (Fig. 2) are adjacent to each other.
  • FIG. 15 is a graph conceptually explaining the effect of the method of designing the massive rotor in the method of designing the squirrel-cage induction rotary electric machine according to the embodiment.
  • the horizontal axis is the number of rotor slots (n / n 0 ), and the vertical axis is the cost C and the loss L.
  • the loss L and the cost C have the property of changing in opposite directions with respect to a change in the number of rotor slots (n / n 0).
  • the characteristics of the loss L and the cost C are shown by the solid line L and the solid line C, respectively.
  • the total index of the weighting of the loss L and the cost C which comprehensively evaluates the loss L and the cost C, is shown by a broken line (C + L).
  • step S201 Thinning out of rotor slot formation
  • the number of rotor slots (n / n 0 ) is reduced, so that the cost C is lowered to C1.
  • the loss increases to L1 due to the occurrence of a region in which the conductor bars 16 adjacent to each other as seen from the rotation axis Z cannot be seen.
  • the position on (C + L) becomes A1, and there is a possibility that a negative effect may occur as a whole.
  • the loss L is reduced to L2 by readjusting the position of the rotor slot 14 in the readjustment step S202 of the rotor slot position.
  • the total index of the weighting of the loss L and the cost C which comprehensively evaluates the loss L and the cost C, also decreases.
  • the design method of the squirrel-cage induction rotary electric machine according to the present embodiment it is possible to obtain a massive rotor having a cost merit while maintaining the performance. That is, in a cage-shaped induction rotary electric machine having a massive rotor, it is possible to suppress an increase in the surface temperature of the rotor core portion of the massive rotor while reducing the cost increase.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Induction Machinery (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

La présente invention concerne un rotor solide (10) utilisé dans une machine électrique tournante à induction à cage d'écureuil comprenant : une partie arbre qui s'étend dans la direction axiale et est supportée en rotation ; une partie noyau de rotor en colonne (13) qui est formée d'un seul tenant avec la partie arbre et a un diamètre supérieur à celui de la partie arbre, et dans laquelle sont formées des fentes de rotor (14) qui sont disposées avec des espaces entre elles dans la direction circonférentielle et s'étendent dans la direction axiale ; et une pluralité de barres conductrices (16) qui pénètrent à travers l'intérieur des fentes de rotor (14) et sont accouplées l'une à l'autre sur les deux côtés extérieurs dans la direction axiale de la partie de noyau de rotor (13). Les deux parois mutuellement opposées de chacune des fentes de rotor (14) s'inclinent d'au moins un angle prédéterminé dans la direction circonférentielle par rapport à un plan qui comprend l'axe de rotation de la partie arbre. Lorsqu'elles sont vues vers l'extérieur dans la direction radiale à partir de l'axe de rotation de la partie arbre, des régions où une partie d'une pluralité de barres conductrices (16) parmi la pluralité de barres conductrices (16) sont présentes et des régions où celles-ci ne sont pas présentes sont disposées en alternance dans la direction circonférentielle.
PCT/JP2020/014028 2020-03-27 2020-03-27 Rotor solide, machine électrique tournante à induction à cage d'écureuil et procédé de conception de machine électrique tournante à induction à cage d'écureuil WO2021192223A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/JP2020/014028 WO2021192223A1 (fr) 2020-03-27 2020-03-27 Rotor solide, machine électrique tournante à induction à cage d'écureuil et procédé de conception de machine électrique tournante à induction à cage d'écureuil
JP2020555249A JP7168680B2 (ja) 2020-03-27 2020-03-27 塊状回転子、かご形誘導回転電機、およびかご形誘導回転電機の設計方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2020/014028 WO2021192223A1 (fr) 2020-03-27 2020-03-27 Rotor solide, machine électrique tournante à induction à cage d'écureuil et procédé de conception de machine électrique tournante à induction à cage d'écureuil

Publications (1)

Publication Number Publication Date
WO2021192223A1 true WO2021192223A1 (fr) 2021-09-30

Family

ID=77891044

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2020/014028 WO2021192223A1 (fr) 2020-03-27 2020-03-27 Rotor solide, machine électrique tournante à induction à cage d'écureuil et procédé de conception de machine électrique tournante à induction à cage d'écureuil

Country Status (2)

Country Link
JP (1) JP7168680B2 (fr)
WO (1) WO2021192223A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0767303A (ja) * 1993-08-27 1995-03-10 Nissan Motor Co Ltd 誘導電動機
JP2012085477A (ja) * 2010-10-14 2012-04-26 Hitachi Ltd 回転電機
WO2019116438A1 (fr) * 2017-12-12 2019-06-20 東芝三菱電機産業システム株式会社 Machine électrique tournante à induction à cage d'écureuil, rotor plein et procédé de conception de machine électrique tournante à induction à cage d'écureuil

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0767303A (ja) * 1993-08-27 1995-03-10 Nissan Motor Co Ltd 誘導電動機
JP2012085477A (ja) * 2010-10-14 2012-04-26 Hitachi Ltd 回転電機
WO2019116438A1 (fr) * 2017-12-12 2019-06-20 東芝三菱電機産業システム株式会社 Machine électrique tournante à induction à cage d'écureuil, rotor plein et procédé de conception de machine électrique tournante à induction à cage d'écureuil

Also Published As

Publication number Publication date
JPWO2021192223A1 (fr) 2021-09-30
JP7168680B2 (ja) 2022-11-09

Similar Documents

Publication Publication Date Title
US7893575B2 (en) Rotor with field coils in optimized flux space slots
CA2316708C (fr) Moteur a induction a cage pour vitesses de rotation elevees
JP4542864B2 (ja) 回転電機及び回転電機の電機子巻線
US2944171A (en) Intermediate ring squirrel cage rotor
US11489424B2 (en) Squirrel-cage induction rotating electrical machine, solid rotor, and design method for squirrel-cage induction rotating electrical machine
JP2006109616A5 (fr)
WO2018066654A1 (fr) Machine électrique rotative à réluctance synchrone
WO2019163021A1 (fr) Stator, moteur électrique, compresseur et dispositif de climatisation
US7812499B2 (en) Armature winding of electric rotating machine, stator of electric rotating machine and electric rotating machine
JP5066820B2 (ja) 磁石構造
JP2016201902A (ja) 誘導機、並びにそれを用いる誘導機駆動システムおよび鉄道車両
WO2021192223A1 (fr) Rotor solide, machine électrique tournante à induction à cage d'écureuil et procédé de conception de machine électrique tournante à induction à cage d'écureuil
JPWO2019123977A1 (ja) 固定子の製造方法
JP2003199267A (ja) 回転電機の固定子
JP5602968B1 (ja) かご形回転子及びかご形回転子を備える電動機
JP2695952B2 (ja) かご形回転子
JP2016036193A (ja) 誘導電動機
JPH07163107A (ja) かご形誘導電動機及びこれに駆動される二乗トルク特性を有する流体機械並びにかご形誘導電動機の製造方法
JP5947703B2 (ja) かご形誘導電動機
JP2006340488A (ja) 回転電機
JP6609482B2 (ja) 回転電機
TW202011672A (zh) 籠形轉子及旋轉電機
CN111564915A (zh) 定子
JP2854703B2 (ja) かご形回転子
US20230396113A1 (en) Stator for a rotating electrical machine

Legal Events

Date Code Title Description
ENP Entry into the national phase

Ref document number: 2020555249

Country of ref document: JP

Kind code of ref document: A

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20927231

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 20927231

Country of ref document: EP

Kind code of ref document: A1