JP2009077458A - Rotor laminated core for reluctance motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotor laminated core for a reluctance motor which has a plurality of arc-shaped slits, in a concentric shape with a rotating shaft-hole side protruded, has laminated core pieces which are formed by arranging the plurality of arc-shaped slits at the circumference of a rotating shaft hole at intervals, is rotated by reluctance torque which is generated on the basis of a difference between a salient pole direction, where magnetic flux easily flows along the extension direction of the arc-shaped slits, and a non-salient pole direction where the magnetic flux is difficult to flow along the parallel arrangement direction of the arc-shaped slits, and can suppress to a minimum level the torque variations of rotor at the operation of the motor, without employing a multi-layer slit structure which is narrow in slit width and slit interval. <P>SOLUTION: This rotor laminated core for the reluctance motor is such that ends of the plurality of arc-shaped slits are formed at equal intervals along the entire periphery of the core pieces. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

    The present invention relates to a rotor laminated iron core for a reluctance motor, and more specifically, a plurality of arc-shaped slits convex on the rotation shaft hole side are formed concentrically, and a plurality of arc-shaped slits are formed around the rotation shaft hole. The present invention relates to a detailed structure of a rotor laminated iron core for a reluctance motor, which is formed by laminating iron core pieces formed at intervals.

    For example, as drive motors installed in various machine tools, automobiles, etc., replacement of conventional brushed motors with brushless motors is progressing due to demands for improved durability and higher output. As an aspect, in a stator laminated iron core that generates a traveling wave magnetic field by multiphase AC, a rotor laminated iron core having a salient pole type magnetic path rotates in synchronization with the traveling wave magnetic field, that is, a reluctance motor (particularly, Synchronous reluctance motors) have been provided (see, for example, Patent Document 1).

  As shown in FIG. 7, a rotor laminated core (rotor laminated core for a reluctance motor) A in a reluctance motor is formed by laminating a predetermined number of core pieces P, P... And integrating these core pieces P, P. A rotation shaft hole O is opened at the center, and arc-shaped slits S, S... As flux barriers (magnetic flux barriers) are formed around the rotation shaft hole O.

  Here, in the rotor laminated iron core A, a magnetic path in the magnetic salient pole direction and a magnetic path in the non-salient pole direction are formed, so that each iron core piece P, P. A plurality of arc-shaped slits S, S... That are convex are formed concentrically, and the group of arc-shaped slits S, S... Formed concentrically is spaced around the rotation shaft hole O. A plurality of sets are formed.

Thereby, along the extending direction of the arc-shaped slits S, S..., A magnetic path in the salient pole direction (dd axis) where the magnetic flux easily flows is formed, and the arc-shaped slits S, S. A magnetic path in the non-salient pole direction (qq axis) in which magnetic flux hardly flows is formed along the direction, and the rotor laminated core A is based on the difference in inductance between the salient pole direction and the non-salient pole direction. It will rotate by the reluctance torque which arises.
JP 2001-258222 A

    By the way, in order to suppress the torque fluctuation of the rotor when the motor is operating, as the number of rotary slits in the rotor increases, the magnetic attraction / repulsive force changes greatly even if the relative position between the rotor and the stator changes. In view of the fact that it is effective, it is effective to employ a multilayer slit provided with a large number of arc-shaped slits having a narrow slit width and slit interval.

  However, the multi-layer slit rotor described above not only has low centrifugal force resistance due to its low rigidity, but when manufacturing the rotor, a large number of arc-shaped slits having a narrow slit width and slit interval are used. , High permeability materials (non-oriented electrical steel sheets and cold-rolled steel sheets) are punched with a mold to form iron core pieces, resulting in severe wear of mold knives such as punches and dies, and reduced dimensional accuracy. There was an inconvenience.

  Furthermore, in the manufacture of the rotor, by forming a large number of arc-shaped slits, processing distortion at the time of punching formation occurs in various places, and in order to suppress the deterioration of the characteristics of the electrical steel sheet accompanying this increase in processing distortion. In addition, since heat treatment such as annealing is required after punching, there is a disadvantage in that the manufacturing process becomes complicated and the cost is inadvertently increased.

  On the other hand, when the number of arc-shaped slits is reduced in order to reduce the inconvenience, as shown in FIG. 8, in the rotor laminated core A forming the arc-shaped slits S, S. The central angle between the adjacent end portions Se differs for each portion Se, and the pitches (intervals) pa, pb, pc, pd, pe and the pitches (intervals) pf, pg, ph at the end portions Se, Se. , Pi, pj are not equal pitches (intervals).

  As described above, the end portions Se, Se,... In the arc-shaped slits S, S,... Are not arranged at equal intervals, so that the rotor laminated core A causes torque fluctuation during motor operation, and It is difficult to estimate the degree of torque fluctuation, and it is difficult to take an effective countermeasure.

  In view of the above-described situation, the present invention provides a rotor stack for a reluctance motor that can suppress a torque fluctuation of the rotor when the motor is operating without adopting a multilayer slit structure having a narrow slit width and slit interval. The purpose is to provide an iron core.

    In order to achieve the above object, a rotor laminated iron core for a reluctance motor according to the invention of claim 1 is formed concentrically with a plurality of arc-shaped slits convex on the rotating shaft hole side, and a plurality of arc-shaped slits are formed. Stacked iron core pieces formed at intervals around the rotation shaft hole, and a magnetic flux along the salient pole direction in which the magnetic flux easily flows along the extending direction of the arc-shaped slit and the parallel direction of the arc-shaped slit. In a rotor laminated core for a reluctance motor that rotates due to a reluctance torque generated based on the difference in inductance from the non-salient direction in which the flow is difficult to flow, the ends of a plurality of arc-shaped slits are equally spaced over the entire circumference of the core piece It is characterized by the formation.

    In the rotor laminated core for a reluctance motor according to the first aspect of the present invention, a plurality of arc-shaped slits are formed at equal intervals over the entire circumference of the core piece, so that a multilayer slit with a narrow slit width and slit interval is formed. Without adopting the structure, in other words, reducing the centrifugal force resistance, wear of the tool blade during punching and dimensional accuracy, and deterioration of the properties of the electrical steel sheet due to the adoption of the multilayer slit structure Therefore, it is possible to suppress the torque fluctuation of the rotor when the motor is operating without causing inconveniences such as complicated manufacturing process and cost increase due to the annealing.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments.
1 to 4 show a first embodiment of a rotor laminated core for a reluctance motor according to the present invention, and this rotor laminated core (rotor laminated core for a reluctance motor) 10 has a predetermined number of core pieces. Are formed by laminating 11, 11... And integrating these iron core pieces 11, 11...

  Further, in the rotor laminated core 10, the rotating shaft hole 11 o side is projected on each of the core pieces 11, 11... In order to form a magnetic path in the magnetic salient pole direction and a magnetic path in the non-salient pole direction. Are formed concentrically, and the concentric arc slits 11S, 11S,... Are formed in a manner that does not change the distance in the radial direction of the iron core piece 11. Further, a plurality of groups of arc-shaped slits 11S, 11S... Are formed around the rotation shaft hole 11o at intervals, and four groups are formed in the embodiment.

  With the above configuration, a magnetic path in the salient pole direction (dd axis) in which the magnetic flux easily flows is formed along the extending direction of the arc-shaped slits 11S, 11S, and the arc-shaped slits 11S, 11S,. A magnetic path in the non-salient pole direction (qq axis) in which the magnetic flux hardly flows is formed along the direction, and thus the rotor laminated core 10 is based on the difference in inductance between the salient pole direction and the non-salient pole direction. Rotation occurs due to reluctance torque generated.

  In addition, the rotor laminated core 10 of the embodiment shown in FIGS. 1 to 4 is limited to forming the five arc-shaped slits 11S, 11S... This does not correspond to a rotor laminated iron core that employs a so-called multilayer slit provided with a large number of arc-shaped slits having a narrow interval.

  Here, in the rotor laminated core 10 described above, as shown in FIG. 2, in the end portions 11Se, 11Se... Of each arc-shaped slit 11S, 11S. The end portions 11Se, 11Se,... Are arranged and formed in such a manner that the center angle is set to 9 ° (deg) based on the reason described later.

  Thus, as shown in FIG. 3, the end portions 11Se, 11Se,... Of the arc-shaped slits 11S, 11S,... Have the same pitches p, p ... over the entire circumference of the rotor laminated core 10 (iron core piece 11). They are arranged at regular intervals.

  Incidentally, end portions 11Se, 11Se... Of each arc-shaped slit 11S, 11S... In the rotor laminated core 10 are equivalent to rotary slots RS, RS... Of the induction motor as shown by imaginary lines (two-dot chain lines) in FIG. Can think about it.

  Therefore, in the rotor laminated core A of the reluctance motor according to the present invention, in order to suppress the torque fluctuation of the rotor when the motor is operating, the following formulas 1 to 5 used when designing the induction motor, and The number of formed end portions 11Se, 11Se,... Is determined so as to satisfy the rotor / stator slot number combination formula according to the following formula 6 used when designing the reluctance motor. At the same time, each end portion 11Se, 11Se is determined. Are arranged at equal intervals.

Here, an inappropriate combination formula of the number of slots is as follows.
The formula of 1 is Zr ≠ Zs
The formula of 2 is Zr ≠ Zs ± the number of poles The formula of 3 is Zr ≠ Zs ± 1
The equation of 4 is Zr ≠ Zs + the number of poles ± 1
The formula of 5 is Zr ≠ Zs−number of poles ± 1
Equation 6 is Zr / number of poles = natural number (1, 2, 3,...)
(Zr: number of slit end portions of rotor, Zs: number of slots of stator).

Taking the case of 4 poles and 48 slots in the embodiment as an example, when determining the number Zr of the end portions 11Se in the arc-shaped slit 11S, “the number Zr of the end portions 11Se of the rotor” and “the number of slots Zs of the stator”. Since the values due to an inappropriate combination with “” are as follows, the possible values of Zr among 40 to 50 are “40”, “41”, “46”, and “50”.
Zr ≠ Zs = 48
Zr ≠ Zs ± number of poles = 48 ± 4 = 44,52
Zr ≠ Zs ± 1 = 48 ± 1 = 47,49
Zr ≠ Zs + number of poles ± 1 = 48 + 4 ± 1 = 51,53
Zr ≠ Zs−number of poles ± 1 = 48−4 ± 1 = 43,45
Here, since Zr needs to be divisible by the number of poles 4, the value that can be adopted among them is “40”. As a result, the interval between the adjacent end portions 11Se and 11Se is 360 ° / 40 = 9 °. (deg).

  According to the rotor laminated core 10 having the above-described configuration, the end portions 11Se, 11Se,... Of the plurality of arc-shaped slits 11S, 11S,. It is possible to reduce the torque fluctuation of the rotor at the time, and it is possible to obtain an effect that it is possible to estimate the degree of torque fluctuation in advance at the motor design stage.

  Further, in the rotor laminated core 10 having the above-described configuration, the multi-layer slit structure having a narrow slit width and slit interval is not adopted, in other words, the resistance due to low rigidity due to the adoption of the multi-layer slit structure. It is possible to prevent a decrease in centrifugal force, wear of the die cutter during punching, and a decrease in dimensional accuracy.

  Furthermore, according to the rotor laminated core 10 having the above-described configuration, when the multilayer slit structure is adopted, the manufacturing process is complicated and the cost is reduced due to the annealing for suppressing the deterioration of the properties of the electrical steel sheet due to the increase in processing strain. It is possible to prevent inconveniences such as up.

  FIG. 5 shows a second embodiment of a rotor laminated core for a reluctance motor according to the present invention, and this rotor laminated core (rotor laminated core for a reluctance motor) 20 has a predetermined number of core pieces 21, 21. Are laminated and these iron core pieces 21, 21 ... are integrated, and a rotation shaft hole 20O is opened at the center.

  Further, in the rotor laminated core 20, a plurality of arc-shaped slits 21S, 21S... Having convex on the rotating shaft hole 21o side are formed in each of the core pieces 21, 21. 21S... Are formed in such a manner that the curvatures thereof are individually different and the interval in the radial direction of the iron core piece 21 is changed.

  Further, the end portions 21Se, 21Se,... Of the arcuate slits 21S, 21S,... Are set so that the center angles of the adjacent end portions 21Se are set to be equal over the entire circumference, so that the end portions 21Se, 21Se,. Are arranged at equal intervals with the same pitch p, p... Over the entire circumference of the rotor laminated core 20 (iron core piece 21).

  The configuration of the rotor laminated core 20 described above is the same as the rotor laminated core 10 shown in the first embodiment (FIGS. 1 to 4) except for the planar shape and layout of the arc-shaped slits 21S, 21S. .

  Therefore, according to the rotor laminated core 20 having the above-described configuration, the end portions 21Se, 21Se,... By adopting a multilayer slit structure with a narrow slit width and slit interval, in other words, due to the adoption of the multilayer slit structure, the centrifugal force resistance is reduced and the punching is formed. Torque fluctuations of the rotor during motor operation without incurring inconveniences such as complication of the manufacturing process and cost increase due to annealing to suppress the deterioration of the characteristics of the magnetic steel sheet and deterioration of the dimensional accuracy of the die cutter Can be kept small.

  FIG. 6 shows a third embodiment of a rotor laminated core for a reluctance motor according to the present invention. This rotor laminated core (rotor laminated core for a reluctance motor) 30 has a predetermined number of core pieces 31, 31. Are laminated and these iron core pieces 31, 31 are integrated, and a rotation shaft hole 30O is opened at the center.

  Further, in the rotor laminated core 30, a plurality of arc-shaped slits 31S, 31S... Having convex on the rotating shaft hole 31o side are formed in each of the core pieces 31, 31. , 31S... Are formed in such a manner that they have a substantially crescent-shaped planar shape with both end portions 31Se and 31Se sharpened.

  Further, the end portions 31Se, 31Se,... Of the arc-shaped slits 31S, 31S,... Are set so that the center angles of the adjacent end portions 31Se are the same over the entire circumference, so that the end portions 31Se, 31Se,. Are arranged at equal intervals at the same pitch p, p... Over the entire circumference of the rotor laminated core 30 (iron core piece 31).

  In other words, the rotor laminated core 30 is not different from the rotor laminated core 10 of the first embodiment (FIGS. 1 to 4) except for the planar shape of each arc-shaped slit 31S, 31S.

  Therefore, according to the rotor laminated core 20 having the above-described configuration, the end portions 31Se, 31Se,... Of the plurality of arc-shaped slits 31S are arranged around the entire circumference of the core piece 31 in the same manner as the rotor laminated core 10 of the first embodiment. By adopting a multilayer slit structure with a narrow slit width and slit interval, in other words, due to the adoption of the multilayer slit structure, the centrifugal force resistance is reduced and the punching is formed. Torque fluctuations of the rotor during motor operation without incurring inconveniences such as complication of the manufacturing process and cost increase due to annealing to suppress the deterioration of the characteristics of the magnetic steel sheet and deterioration of the dimensional accuracy of the die cutter Can be kept small.

(a) And (b) is the external appearance top view and external appearance side view which show 1st Example of the rotor laminated iron core for reluctance motors concerning this invention. The whole top view which shows the rotor lamination | stacking iron core for reluctance motors of FIG. The principal part top view which shows the rotor lamination | stacking iron core for reluctance motors of FIG. The principal part top view which shows the rotor lamination | stacking iron core for reluctance motors of FIG. (a) And (b) is a principal part top view which shows 2nd Example of the rotor lamination | stacking iron core for reluctance motors concerning this invention. (a) And (b) is a principal part top view which shows 3rd Example of the rotor lamination | stacking iron core for reluctance motors concerning this invention. (a) And (b) is an external appearance top view and external appearance side view of the conventional rotor lamination | stacking iron core for reluctance motors. The principal part top view of the conventional rotor lamination | stacking iron core for reluctance motors.

Explanation of symbols

10 ... Rotor laminated core for reluctance motor,
11 ... Iron core piece,
11S: Arc-shaped slit,
11Se ... end,
20 ... Rotor laminated core for reluctance motor,
21 ... Iron core piece,
21S ... arc-shaped slit,
21Se ... end,
30 ... Rotor laminated core for reluctance motor,
31 ... Iron core piece,
31S: Arc-shaped slit,
31Se ... end.

Claims (1)

A plurality of arc-shaped slits convex on the rotating shaft hole side are formed concentrically, and the plurality of arc-shaped slits are formed by laminating iron core pieces formed at intervals around the rotating shaft hole, Due to the reluctance torque generated based on the difference in inductance between the salient pole direction in which the magnetic flux easily flows along the extending direction of the arc-shaped slit and the non-salient pole direction in which the magnetic flux does not easily flow along the parallel direction of the arc-shaped slit. In the rotor laminated core for rotating reluctance motor,
A rotor laminated core for a reluctance motor, wherein ends of the plurality of arc-shaped slits are formed at equal intervals over the entire circumference of the core piece.

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