JP2013042626A - Rotor and compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique of avoiding or suppressing noise or vibration without causing a significant increase in manufacturing cost, in a rotor mounted in an inner rotor type rotary electric machine supported only at one end of a shaft.SOLUTION: Split bodies 40Aa-40Af constituting the core 40 of a rotor 4A mounted in an inner rotor type rotary electric machine exhibits a first circular arc C1 having a rotating shaft Q as a focus in plan view on one side in the axial direction A, and exhibits a second circular arc C2 parallel with the first circular arc C1 on the outside thereof in the radial direction R on the bearing 1 side. Each Split body 40Aa-40Af is formed by laminating a plurality of steel plates 70c, 70d which are punched by means of teeth exhibiting arcs of the same curvature.

Description

  The present invention relates to a rotor and a compressor, and more particularly to a rotor mounted on a radial gap type rotating electrical machine and a compressor equipped with the rotor.

  The radial gap type rotating electric machine includes an armature and a field element, which are substantially concentric with the rotating shaft in a plane having a predetermined rotating shaft as a normal line. An armature is employed as a stator outside the field element as a stator, and the field element is employed as a rotor that rotates by being fixed to a shaft that rotates about the rotation axis. In such a radial gap type rotating electrical machine, a technique for supporting only one end portion of the shaft has been proposed, which is disclosed in Patent Documents 1 to 4 listed below.

Japanese Utility Model Publication No.59-122777 Japanese Utility Model Publication No. 2-022083 Japanese Utility Model Publication No. 2-068645 Japanese Utility Model Publication No. 1-123458

  In an aspect in which only one end portion of the shaft is supported, the other end portion of the shaft is swung around during operation of the rotating electrical machine. In particular, when the center of gravity of the rotor fixed to the shaft is at a position away from the rotation shaft, for example, the rotating electric machine is mounted on the compressor and the shaft end is eccentric to operate the compression mechanism. In addition, when the center of gravity of the rotor is inevitably at a position away from the rotation axis in order to cancel the eccentricity, the rotor swings greatly. Therefore, the air gap between the rotor and the stator is smaller during operation than when the rotor is stationary, and the rotor swings. If the rotor swings during operation of the rotating electrical machine, it may cause noise and vibration. Further, if the amount of swing increases and the rotor and the stator come into contact with each other, the stator may be heated and the insulation may be destroyed. By making the rotor thinner, contact between the rotor and the stator during operation is avoided or suppressed. Moreover, in the said patent document 3, the surface which opposes the rotor of a stator exhibits inclination or a level | step difference, and the rotor and stator of driving | operation are taken by taking the air gap in the edge part of the other side of a shaft. Contact is avoided or suppressed.

  The aspect with these technologies is ideal in terms of avoiding or suppressing noise and vibration, but when actually manufactured, the manufacturing cost is significantly increased compared to the case where the technology is not applied. . For example, when the surfaces of the rotor and the stator facing each other are inclined, the surfaces of the rotor and / or the stator facing each other are extended in the extending direction of the rotation shaft (hereinafter also referred to as “axial direction”). Of these, it is necessary to continuously change the entire region exhibiting the inclined surface, resulting in an increase in manufacturing cost. In particular, when the cross section perpendicular to the axial direction of the rotor is changed concentrically along the axial direction, it is necessary to prepare circular molds having different diameters, and the manufacturing cost is remarkably increased.

  In view of the above problems, the present invention provides a rotor mounted on a radial gap type rotating electrical machine that is supported only at one end of a shaft, without causing a significant increase in manufacturing cost. It aims at providing the technique which avoids or suppresses.

  In order to solve the above problems, a first aspect of a rotor according to the present invention extends along a rotation axis (Q) parallel to the axial direction (A), and the rotation shaft on one side in the axial direction. Is fixed to a shaft (2) having one end rotatably fixed around the shaft and the other end not fixed on the other side in the axial direction, and along a radial direction (R) centered on the rotational axis A rotor (4, 4A-4H) having a first edge (E1) facing the stator through a gap, and a plurality of steel plates (70) punched into a predetermined shape A core (40, 40A-40H) formed by laminating the normal direction of the surface of the steel plate parallel to the axial direction is provided, and the core defines the innermost edge that is the innermost edge in the radial direction. The second edge (E2) and the third edge defining the outermost edge which is the outermost edge in the radial direction. (E3), and the thickness in the radial direction of the core between the second edge and the third edge on the outer side in the radial direction is more on the other side than the one side end. At the end, the first edge is smaller, and the first edge is a rotor that exhibits an arc having the same curvature at the one end and the other end in plan view from the axial direction.

  The 2nd aspect of the rotor which concerns on this invention is the 1st aspect, Comprising: The said core (40,40A-40E) is enclosed by the said stator via the said space | gap, The said core is the said A plurality of holes (52, 52A-52E) which penetrate in the axial direction (A) and are adjacent in the circumferential direction (θ) centering on the rotation axis (Q) are presented.

  A third aspect of the rotor according to the present invention is the second aspect, wherein the core (40, 40A-40E) extends in the circumferential direction (θ) and extends outward in the radial direction (R). The radial thickness with respect to the rotation axis (Q) of the core as a base point is a plurality of the magnetic poles directed to the center of the circumferential direction (54, 54A-54E) is smaller at the circumferential center (56, 56A-56E) between the two magnetic poles adjacent in the circumferential direction at the same axial position as the center.

  The 4th aspect of the rotor which concerns on this invention is the 1st aspect, Comprising: The said core (40,40A-40E) is enclosed by the said stator via the said space | gap, and the said circumferential direction ((theta) ) Extending in the radial direction (R) and presenting a plurality of magnetic poles, and the radial thickness with respect to the rotation axis (Q) of the steel plate is the circumferential thickness of one magnetic pole. It is smaller at the center (56, 56A-56E) in the circumferential direction between two magnetic poles adjacent in the circumferential direction than at the center (54, 54A-54E).

  The 5th aspect of the rotor which concerns on this invention is the 3rd aspect, Comprising: The said core (40A, 40B, 40E) is the division body (40Aa-40Af, 40Ba) adjacent in the said circumferential direction ((theta)). −40Bf, 40Ea-40Ed), and each of the divided bodies has at least one of the magnetic poles at the center in the circumferential direction, and one magnetic pole adjacent to the circumferential direction and the other magnetic pole. Is substantially coincident with the circumferential edge of the divided body.

  A sixth aspect of the rotor according to the present invention is the fifth aspect thereof, wherein the divided bodies (40Aa-40Af, 40Ba-40Bf, 40Ea-40Ed) are in the plan view at the other side end. It exhibits a first arc (C1) with the rotation axis (Q) as a focal point, and is parallel to the first arc outside the first arc at the one end portion in the radial direction (R). Presents a second arc (C2).

  7th aspect of the rotor which concerns on this invention is the 3rd aspect, Comprising: The said core (40C, 40D) is the division body (40Ca-40Cf, 40Da-40Dd) adjacent to the said circumferential direction ((theta)). ), And the two divided bodies adjacent in the circumferential direction cooperate to present one magnetic pole.

  The 8th aspect of the rotor which concerns on this invention is the 7th aspect, Comprising: The said division body (40Ca-40Cf, 40Da-40Dd) is the said rotating shaft (in the said planar view) in the said one side edge part. A fourth arc that exhibits a third arc (C3) with Q) as the focal point and is parallel to the third arc outside the third arc at the other side end of the radial direction (R). Present (C4).

  A ninth aspect of the rotor according to the present invention is the second aspect, further comprising a plurality of field magnets (50), wherein the field magnets have their magnetic pole surfaces arranged in the radial direction (R). Is embedded in the core (40, 40A-40C).

  The 10th aspect of the rotor which concerns on this invention is the 9th aspect, Comprising: The said cores (40, 40A-40C) are said field magnets (50) adjacent in the said circumferential direction ((theta)). And a region between the fourth edge (E4) inside the radial direction (R) of the hole (52, 52A-52C) and the first edge (E1), A fifth edge (E5, E5A-E5C) exhibiting at least one gap along the axial direction (A) in the region is exhibited.

  An eleventh aspect of the rotor according to the present invention is the first aspect, wherein the core (40F-40H) surrounds the stator via the gap, and a plurality of field magnets (50) are provided. The field magnet passes through the axial direction (A) and is adjacent in the circumferential direction (θ) with the rotation axis (Q) as the center, and the magnetic pole surface thereof extends in the radial direction (R). Is embedded in the core.

  A twelfth aspect of the rotor according to the present invention is the eleventh aspect, wherein the core (40G) includes a plurality of adjacent divided bodies (40Ga-40Gf) in the circumferential direction (θ), Each of the divided bodies presents at least one of the magnetic pole surfaces at the center in the circumferential direction, and one boundary between the one magnetic pole surface adjacent to the circumferential direction and the other magnetic pole surface is the divided body. Substantially coincides with the circumferential edge.

  A thirteenth aspect of the rotor according to the present invention is the twelfth aspect thereof, wherein the divided body (40Ga-40Gf) focuses the rotation axis (Q) in the plan view at the other side end. A second arc (C6) parallel to the first arc outside the first arc at the other end is provided outside the radial direction (R). Present.

  A fourteenth aspect of the rotor according to the present invention is the eleventh aspect thereof, wherein the core (40H) has a plurality of adjacent divided bodies (40Ha-40Hf) in the circumferential direction (θ). The two divided bodies adjacent in the circumferential direction cooperate to form one hole (52F) that houses the field magnet (50).

  A fifteenth aspect of the rotor according to the present invention is the fourteenth aspect thereof, wherein the divided body (40Ha-40Hf) focuses the rotation axis (Q) at the one side end portion in the plan view. A fourth arc (C8) parallel to the third arc outside the radial direction (R) from the focal point of the third arc at the other end. ).

  A sixteenth aspect of the rotor according to the present invention is the first to fifteenth aspects, and is a first position separated from the rotation axis (Q) in plan view from the axial direction (A). (Pw1) further includes a weight (20) having a center of gravity, and the core (40, 40A-40H) is provided adjacent to the weight on the one side.

  A first aspect of a compressor according to the present invention is a compressor (100, 100A) equipped with the rotor (4, 4A-4H) of any one of the first to sixteenth aspects of a rotor according to the present invention. ), And the center of gravity when the shaft (2) rotates is a compressor at a second position (Pw2) away from the rotation axis (Q).

  When only one end in the extending direction of the shaft is fixed and the shaft rotates about the extending direction as a rotation axis, the rotor fixed to the shaft swings greatly on the other end side in the extending direction. According to the 1st aspect of the rotor which concerns on this invention, even if a rotor rotates, it can avoid or suppress that a rotor shakes around or a rotor and a stator contact. Therefore, noise, vibration, or breakage can be avoided or suppressed. Moreover, since the 1st edge exhibits the circular arc of the same curvature, the number of the metal mold | die which punches a steel plate can be suppressed.

  Employing the second aspect of the rotor according to the present invention in a rotating electric machine contributes to obtaining a rotating electric machine that is smaller and lighter than a surface magnet type rotating electric machine and that can avoid or suppress noise, vibration, or breakage.

  According to the third aspect of the rotor according to the present invention, in a plan view from the axial direction, the rotor swells in the radial direction as it approaches the center of the magnetic pole. Therefore, if it is adopted in a rotating electrical machine, the air gap between the center of the magnetic pole and the stator can be reduced, which contributes to the reduction of cogging torque.

  The fourth aspect of the rotor according to the present invention contributes to obtaining a rotating electrical machine that is smaller and lighter than the outer rotor type rotating electrical machine and that can avoid or suppress noise, vibration, or breakage. Further, in a plan view from the axial direction, the shape swells in the radial direction as it approaches the center of the magnetic pole. Therefore, if it is adopted in a rotating electrical machine, the air gap between the center of the magnetic pole and the stator can be reduced, which contributes to the reduction of cogging torque.

  According to the 5th aspect of the rotor which concerns on this invention, it contributes to obtaining the effect of a 3rd aspect in an IPM motor or a synchronous reluctance motor.

  According to the sixth aspect of the rotor of the present invention, it contributes to obtaining the effect of the third aspect.

  According to the 7th aspect of the rotor which concerns on this invention, it contributes to obtaining the effect of a 3rd aspect in an IPM motor or a synchronous reluctance motor.

  According to the eighth aspect of the rotor of the present invention, it contributes to obtaining the effect of the third aspect.

  According to the ninth aspect of the rotor of the present invention, an energy saving, high efficiency, and high torque motor can be obtained.

  According to the 10th aspect of the rotor which concerns on this invention, it can avoid or suppress that the magnetic flux by a field magnet short-circuits inside a core.

  If the 11th aspect of the rotor which concerns on this invention is employ | adopted for a rotary electric machine, it will contribute to obtaining the rotary electric machine which can avoid or suppress a noise, a vibration, or a failure | damage higher than an inner rotor type rotary electric machine.

  According to the 12th aspect of the rotor which concerns on this invention, it contributes to obtaining the effect of an 11th aspect in an IPM motor.

  If the thirteenth aspect of the rotor according to the present invention is employed in a rotating electrical machine, the air gap between the center of the magnetic pole and the stator can be reduced, which contributes to the reduction of cogging torque.

  According to the fourteenth aspect of the rotor according to the present invention, it contributes to obtaining the effect of the eleventh aspect in the IPM motor.

  If the 15th aspect of the rotor which concerns on this invention is employ | adopted for a rotary electric machine, the air gap between the center of a magnetic pole and a stator can be made small, and it contributes to the reduction of cogging torque.

  According to the sixteenth aspect of the rotor according to the present invention, the whirling of the rotor can be further reduced.

  According to the first aspect of the compressor of the present invention, a compressor with less noise and vibration can be obtained.

It is a longitudinal section of a compressor carrying an inner rotor type rotary electric machine provided with a rotor concerning a 1st embodiment of the present invention. It is a top view of a rotor. It is a figure which shows the manufacturing process of a rotor. It is a conceptual diagram explaining the movement of a metal mold | die. It is a top view of the rotor which concerns on the 2nd Embodiment of this invention. It is a figure explaining the formation process of a steel plate. It is a top view of a division body. It is a top view of the rotor which concerns on the 3rd Embodiment of this invention. It is a figure explaining the manufacturing process of a division body. It is a top view of a division body. It is a top view of the rotor which concerns on the 4th Embodiment of this invention. It is a top view of the rotor which concerns on the 5th Embodiment of this invention. It is a top view of the rotor which concerns on the 6th Embodiment of this invention. It is a longitudinal cross-sectional view of the compressor carrying the outer rotor type rotary electric machine provided with the rotor which concerns on the 7th Embodiment of this invention. It is a top view of the rotor which concerns on the 7th Embodiment of this invention. It is a top view of the rotor which concerns on the 8th Embodiment of this invention. It is a top view of the rotor which concerns on the 9th Embodiment of this invention.

  Preferred embodiments of the present invention will be described below with reference to the drawings. In the following drawings including FIG. 1, only elements related to the present invention are shown.

<First Embodiment>
<Device configuration>
As shown in FIG. 1, the rotor 4 constitutes an inner rotor type rotating electrical machine 10 together with the shaft 2 and the stator 6. The inner rotor type rotating electrical machine 10 is mounted on the compressor 100. Here, FIG. 1 is a longitudinal sectional view of the compressor 100 and shows a sectional view in a direction parallel to the extending direction of the shaft 2.

  As shown in FIG. 1, the shaft 2 extends along a rotation axis Q parallel to the axial direction A, and has one end fixed to be rotatable about the rotation axis Q on one side of the axial direction A, The other end of the direction A and not fixed. Specifically, the shaft 2 is rotatably fixed to the bearing 1 on one side in the extending direction.

  The rotor 4 is fixed to the shaft 2 and exhibits an edge E <b> 1 that faces the stator 6 through a gap along the radial direction R centered on the rotation axis Q. Specifically, it has a core 40 that exhibits a rotationally symmetric column about the rotation axis Q. The core 40 presents an edge E2 that defines the innermost edge as the innermost edge in the radial direction R, and an edge E3 that defines the outermost edge as the outermost edge in the radial direction R. In the inner rotor type rotating electric machine 10, the edge E3 coincides with the edge E1. More specifically, the core 40 has an annular hole from the approximate center of the bottom surface on the bearing 1 side of the column body exhibited by the core 40 toward the approximate center of the top surface on the side opposite to the bearing 1 side. Present. The hole is defined by the edge E2 and forms a through hole 41 through which the shaft 2 passes. Further, the edge E3 faces the stator 6 via a gap along the radial direction R. In other words, the rotor 4 has a through hole 41 through which the shaft 2 passes and is fixed around the rotation axis Q of the shaft 2. Further, it is desirable that the core 40 has no weight deviation regardless of the portion.

  The stator 6 has an armature winding 61 and surrounds the rotor 4 through a gap along the radial direction R and faces the rotor 4.

  The thickness in the radial direction R of the core 40 between the edge E2 and the edge E3 is more on the other side in the axial direction A (the opposite side than the bearing 1 side) than one side in the axial direction A (bearing 1 side). , Smaller. Specifically, as shown in FIG. 1, the cross section of the core 40 has a substantially isosceles trapezoidal shape with the axial direction A in the height direction about the rotation axis Q, and the length of the side of the isosceles trapezoid is The bearing 1 side is longer than the opposite side to the bearing 1 side.

  The shaft 2 has a columnar shape centered on the rotation axis Q, and the rotor 4 fixed to the shaft 2 also exhibits a rotationally symmetric column with the rotation axis Q as an axis as described above, and has no weight bias. However, the bearing 1 side of the shaft 2 is connected to a piston 91 that bears a part of the compression mechanism of the compressor 100. Accordingly, the rotational center of gravity of the shaft 2 inevitably has a center of gravity at a position Pw0 away from the rotational axis Q in a plan view from the side opposite to the bearing 1 side (hereinafter, also simply referred to as “plan view”).

  A first weight 22 having a center of gravity at a position Pw2 away from the rotation axis Q in plan view is attached to the bearing 1 side of the rotor 4. The height dimension of the first weight 22 in the axial direction A can be reduced as the position Pw0 is further away from the rotation center. Since the first weight 22 stirs the oil in the compressor, the height dimension contributes to the compression efficiency. For this reason, when trying to obtain high compression efficiency, the position Pw0 is far away from the rotation axis Q, which is unbalanced. Therefore, the shaft 2 and the rotor 4 are removed by the first weight 22, and the unbalance between the shaft 2 and the rotor 4 is eliminated by the first weight 22. However, the center of gravity of the shaft 2 and the rotor 4 is slightly separated from the rotation axis Q even when the first weight 22 is attached to the rotor 4.

  The rotor 4 is provided with a second weight 20. Specifically, a second weight 20 having a center of gravity at a position Pw1 opposite to the position Pw2 with respect to the rotation axis Q in a plan view on the side opposite to the bearing 1 side of the core 40 is attached to the rotor 4. It is done. In other words, the core 40 is provided adjacent to the second weight 20 on the bearing 1 side. Together with the first weight 22 and the piston 91, the second weight 20 functions as a balance weight for adjusting the rotational center of gravity of the shaft 2 and the rotor 4 and adjusting the dynamic balance.

  If the center of gravity of the shaft 2 and the rotor 4 is only adjusted, the first weight 22 and the piston 91 may have the same moment at positions different from each other by 180 degrees about the rotation axis Q in plan view. However, in this case, when the rotor 4 is rotated, the shaft 2 is inclined with respect to the axial direction A, and there is a problem that swinging becomes large. In order to solve a part of this problem, the second weight 20 is provided. Thereby, even if the rotor 4 rotates, the whirling of the rotor 4 can be suppressed. In addition, the rotor 4 can be easily controlled. Furthermore, by mounting the inner rotor type rotating electrical machine 10 employing such a rotor 4 on the compressor 100, a compressor with less noise and vibration can be obtained. If the shaft 2 is an ideal rigid body, the swinging of the rotor 4 is substantially zero in the above manner.

  As shown in FIG. 2, the core 40 exhibits a plurality of magnetic poles extending in the circumferential direction θ and going outward in the radial direction R. Specifically, for example, the rotor 4 employs an IPM rotor. More specifically, the core 40 has a plurality of holes 52 penetrating in the axial direction A, and each of the holes 52 includes a plurality of field magnets 50 embedded with the magnetic pole faces in the radial direction R. . More specifically, for example, the rotor 4 exhibits six holes 52 arranged at equal intervals in the circumferential direction θ. Accordingly, the rotor 4 exhibits six-fold rotational symmetry about the rotation axis Q. Then, one field magnet 50 is embedded in one hole 52 so that the magnetic pole surface faces in the radial direction R1 at the center in the circumferential direction θ of the one hole 52. A single field magnet 50 may be formed by combining a plurality of magnets. Thereby, energy saving, high efficiency, and a high torque motor can be obtained. Further, it is possible to obtain a rotating electrical machine that is smaller and lighter than a surface magnet type rotating electrical machine and that can avoid or suppress noise, vibration, or breakage.

  As shown in FIG. 2, the thickness of the core 40 in the radial direction R with respect to the rotation axis Q is the same as the center 54, rather than the center 54 in the circumferential direction θ of one magnetic pole, regardless of the position in the axial direction A. It is smaller at the center 56 in the circumferential direction θ between two magnetic poles adjacent in the circumferential direction θ at the position in the axial direction A. In short, the core 40 has a shape that swells in the radial direction R as it is closer to the center of one magnetic pole in the circumferential direction θ in plan view. Thereby, the air gap between the magnetic pole center 54 and the stator 6 can be reduced, and the cogging torque can be reduced. In FIG. 2, the edge 62 inside the radial direction R of the stator 6 facing the rotor 4 outside the radial direction R of the rotor 4 is indicated by a one-dot chain line.

  Further, the core 40 is between the edges E4 and E1 that extend between the adjacent holes 52 in the circumferential direction θ and extend along the axial direction A inside the radial direction R of the holes 52. In the region, an edge E5 exhibiting at least one gap along the axial direction A in the region is presented. In the present embodiment, the edge E <b> 5 that opens toward the outside in the radial direction R in the region is exhibited over the entire axial direction A of the core 40 between any holes 52 adjacent in the circumferential direction θ. The edge E5 functions as a so-called flux barrier and can avoid or suppress the magnetic flux generated by the field magnet 50 from being short-circuited inside the core 40.

  The core 40 presents a plurality of substantially V-shaped grooves in plan view. Specifically, a V-shaped groove D that opens toward the outside in the radial direction R in a plan view is presented between the adjacent edges E5 in the circumferential direction θ.

  As shown in FIG. 2, the core 40 is formed by laminating a plurality of steel plates 70 punched into a predetermined shape in parallel with the axial direction A in the normal direction of the surface that the steel plates 70 exhibit. Specifically, the core 40 includes a plurality of circular holes H1 corresponding to the through holes 41, a plurality of trapezoidal holes H2 corresponding to a plurality of holes 52, a plurality of edges E10 corresponding to a plurality of edges E5, and grooves D. A plurality of steel plates 70 punched into a shape exhibiting a plurality of edges Da corresponding to a plurality are formed by laminating the normal direction of the surface exhibited by the steel plates 70 in parallel with the axial direction A. More specifically, the core 40 includes a plurality of circular holes H1 and trapezoidal holes H2 provided by one steel plate 70, and a plurality of peripheral edges E10 provided by a plurality of circular holes H1 and trapezoidal holes H2 provided by other steel plates 70 and The plurality of edges E10 are laminated so as to be smoothly continuous in the axial direction A.

  One steel plate 70a located on the bearing 1 side of the core 40 and the other steel plate 70b located on the opposite side to the bearing 1 side are trapezoidal holes H2 from the center (rotary axis Q) of the circular hole H1 of the steel plate 70. On the other hand, the length to the edge E0 opposite to the circular hole H1 is different. Here, the edge E0 of the steel plate 70 forms the edge E1 of the core 40 when a plurality of the steel plates 70 are laminated. One steel plate 70a and the other steel plate 70b have the following differences. That is, the length from the center of the first circular hole H1a exhibited by one steel plate 70a to the edge E0a opposite to the first circular hole H1a with respect to the trapezoidal hole H2a exhibited by the one steel plate 70a. La is longer than the length Lb from the center of the circular hole H1b exhibited by the other steel plate 70b to the edge E0b opposite to the circular hole H1b with respect to the trapezoidal hole H2b exhibited by the other steel plate 70b.

  By changing the length L corresponding to the lengths La and Lb of the steel plate 70 sandwiched between one steel plate 70a and another steel plate 70b in the range of La> L> Lb, the edges E2, E3 The core 40 having a smaller shape in the radial direction R of the core 40 between them can be formed on the side opposite to the bearing 1 side than on the bearing 1 side.

  Here, the edge E1 exhibits an arc having the same curvature on the bearing 1 side and the opposite side to the bearing 1 side in plan view. Specifically, the edges E0a and E0b and the edge E0 of the steel sheet 70 sandwiched between one steel sheet 70a and another steel sheet 70b all exhibit an arc having the same curvature. Thereby, the number of metal mold | die which punches the steel plate 70 can be suppressed, and cost control can be implement | achieved.

  In short, the core 40 is surrounded by the stator 6 through a gap, extends in the circumferential direction θ, presents a plurality of magnetic poles toward the outside in the radial direction R, and the radial direction R starting from the rotation axis Q of the steel plate 70. Is smaller than the center 54 in the circumferential direction θ of one magnetic pole at the center 56 in the circumferential direction θ between two magnetic poles adjacent in the circumferential direction θ.

<Production method>
One steel plate 70 is formed by a process as shown in FIG. 3, for example. Specifically, a long magnetic material 900 is perforated using a mold 84 having a plurality of teeth 84a, a plurality of teeth 85a, and a plurality of teeth 88a. The teeth 84 a have a perfect annular surface, and form a circular hole H <b> 1 in the magnetic material 900. The plurality of teeth 85a, for example, has a trapezoidal shape around the teeth 84a and surrounds the teeth 84a at six equal intervals in the circumferential direction θ around the center of a perfect circle exhibited by the teeth 84a. A plurality of trapezoidal holes H2 are formed. The teeth 88 a have a trapezoidal shape on the side far from the teeth 84 a with respect to the teeth 85 a near the ends in the circumferential direction θ of the respective teeth 85 a, and form a plurality of edges E 10 with respect to the magnetic material 900.

  For the magnetic material 900 in which a plurality of the circular holes H1 and the trapezoidal holes H2 and the plurality of the edge E10 are punched in this way, the magnetic material 900 is formed by using the mold 80 having the teeth 80a having a substantially arcuate surface. Punched to form a plurality of edges E0.

  Specifically, for example, the focal point of the arc presented by the tooth 80a is a part of a circle including all of the circular hole H1 and the trapezoidal hole H2 when it coincides with the center of the circular hole H1. Such a tooth 80a punches the outside in the radial direction R of the one trapezoidal hole H2c, thereby forming the edge E0c outside the radial direction R of the one trapezoidal hole H2c. In a state where the mold 80 is separated from the magnetic material 900, a point F5 on the opposite side of the tooth 80a with respect to the focal point on a line connecting the center of the circular arc θ in the circumferential direction θ and the focal point of the circular arc. And a predetermined angle (60 degrees in this embodiment) in the circumferential direction θ. Here, the point F5 is a position corresponding to the rotation axis Q of the rotor 4. Thereafter, the tooth 80a punches out the radial direction R outside of the other trapezoidal hole H2d adjacent to the one trapezoidal hole H2c in the circumferential direction θ, whereby the edge E0d on the radial direction R outside of the other trapezoidal hole H2d. Form. The steps of rotating and punching the mold 80 are repeated to form the edge E0 on the outer side in the radial direction R of all the trapezoidal holes H2.

  Here, in order to distinguish one trapezoidal hole from another trapezoidal hole, reference numerals H2c and H2d are given for the sake of convenience, but the structure and function are the same. In addition, for the sake of convenience, reference numerals E0c and E0d are assigned to distinguish between the side edge of the one trapezoidal hole H2c that is present outside the radial direction R and the side edge of the other trapezoidal hole H2d that is presented outside the radial direction R. However, the structure and function are equal to the edge E0.

  Thus, a die 81 having teeth 81a having a substantially V-shaped surface is formed on the magnetic material 900 in which a plurality of circular holes H1, trapezoidal holes H2, a plurality of side edges E10, and a plurality of side edges E0 are punched. The magnetic material 900 is punched out and the steel plate 70 is formed.

  Specifically, for example, the V-shape exhibited by the tooth 81a is the two edges E10c and E10d exhibited by the magnetic material 900 between one pair (two) of trapezoidal holes H2c and H2d adjacent in the circumferential direction θ. Open toward the outside in the radial direction R. Such a tooth 81a punches out the magnetic material 900 so that the V shape opens toward the outside in the radial direction R between the pair of trapezoidal holes H2c and H2d, thereby One edge Dac is formed between the pair of trapezoidal holes H2c and H2d. In a state where the mold 81 is separated from the magnetic material 900, the point F6 opposite to the angle (<180 degrees) formed by the bent portion 81b in plan view with respect to the V-shaped bent portion 81b exhibited by the teeth 81. And a predetermined angle (60 degrees in this embodiment) in the circumferential direction θ. Thereafter, the teeth 81a are punched between the other pair of trapezoidal holes H2 adjacent to the one pair of trapezoidal holes H2c, H2d in the circumferential direction θ, so that the gap between the other pair of trapezoidal holes H2 is determined. The other edge Dad is formed. The steps of rotating and punching the mold 81 are repeated to form the edge Da between all the pair of trapezoidal holes H2. Of course, the edge Da may be punched at a time with a mold (not shown) having six teeth 81a at equal intervals in the circumferential direction θ.

  Here, for the sake of convenience, reference numerals Dac and Dad are given to distinguish the edge presented between one pair of trapezoidal holes H2 and the edge presented between the other pair of trapezoidal holes H2. However, the structure and function are equal to the edge Da. The position of the point F6 with respect to the tooth 81a corresponds to the position of the focal point F3 with respect to the tooth 80a. Thereby, the one steel plate 70 and by extension the core 40 have a rotationally symmetric shape in plan view.

  The other steel plate 70 is formed by substantially the same process as described above. Differences between the step of forming one steel plate 70 and the step of forming another steel plate 70 are as follows. That is, in the step of punching the edge E0 of the one steel plate 70 described above, the teeth 80a are rotated 60 degrees in the circumferential direction θ around the point F5, but when forming another steel plate 70, for example, The focal point F3 is rotated at a predetermined angle (60 degrees) in the circumferential direction θ about the focal point F3 as a point corresponding to the rotation axis Q of the rotor 4. In this way, by changing the center when the tooth 80a is rotated on the line connecting the point F5 and the focal point F3, the edge E0a of the steel plate 70a on the bearing 1 side and the steel plate on the opposite side to the bearing 1 side. The edge E0b of 70b exhibits an arc having the same curvature.

<Second Embodiment>
<Device configuration>
Hereinafter, other embodiments of the rotor 4 will be described. In addition, about the element which has the same function as the above-mentioned embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 5, the rotor 4A has a core 40A. The rotor 4A constitutes the inner rotor type rotating electrical machine 10 (see FIG. 1) together with the shaft 2 and the stator 6 in place of the rotor 4 shown in the first embodiment. In FIG. 5, the edge 62 inside the radial direction R of the stator 6 facing the rotor 4A outside the radial direction R of the rotor 4A is indicated by a one-dot chain line.

  The core 40A includes a plurality of divided bodies 40Aa-40Af that are adjacent in the circumferential direction θ. Each of the divided bodies 40Aa to 40Af presents the edge 52 on at least one side of the hole 52 and the circumferential direction θ of the hole 52. In the present embodiment, the edge E5A is presented on both sides of the hole 52 in the circumferential direction θ. Specifically, for example, the core 40A is equally divided in the circumferential direction θ in accordance with the number of field magnets 50 provided in the rotor 4A, and these are defined as divided bodies 40Aa-40Af. At least one of the field magnets 50 is accommodated in the hole 52 in each of the divided bodies 40Aa-40Af. Each of the divided bodies 40Aa-40Af in which the field magnets 50 are housed exhibits at least one of the magnetic poles in the center in the circumferential direction θ. In this embodiment, each of the divided bodies 40Aa-40Af shows a mode in which one magnetic pole is exhibited. One of the boundaries between one magnetic pole and the other magnetic pole that are adjacent in the circumferential direction θ substantially coincides with the peripheral edge of the divided bodies 40Aa-40Af in the circumferential direction θ. Thus, forming the core 40A by combining the divided bodies 40Aa-40Af adjacent in the circumferential direction θ contributes to avoiding or suppressing a short circuit of the magnetic flux between the field magnets 50 adjacent in the circumferential direction θ.

  Further, the divided bodies 40Aa-40Af present a first arc C1 having the rotation axis Q as a focal point in a plan view on the side opposite to the bearing 1 side, and in the radial direction R more than the first arc C1 on the bearing 1 side. A second arc C2 having the same curvature as the first arc C1 is present on the outside.

<Production method>
Each of the divided bodies 40Aa to 40Af forming the core 40A is formed by laminating a plurality of steel plates 70c and 70d punched into a predetermined shape in parallel with the axial direction A in the normal direction of the surface exhibited by the steel plates 70c and 70d. Formed. Specifically, each of the divided bodies 40Aa to 40Af is a surface on which the steel plates 70c and 70d exhibit a plurality of the steel plates 70c and 70d that are punched in a substantially fan shape and exhibit a part of the edge E1 and a part of the edge E2. It is formed by laminating in the normal direction. In addition, since formation of each of the steel plates 70c and 70d is the same up to an intermediate process, in FIG. 6, the same process is shown in a unified manner, and the subsequent different processes are shown by a one-dot chain line branch. .

  As shown in FIG. 6, for example, a gold plate in which trapezoidal teeth 90a and teeth 90b and 90c extending in predetermined directions from both ends in the extending direction of the teeth 90a are arranged in a substantially U shape. Using the mold 90, the magnetic material 900 is perforated to form a side edge E90a corresponding to the hole 52 and two side edges E90b and E90c corresponding to part of the two side edges E5A.

  Thereafter, using a die 92 having a substantially arcuate tooth 92c having a focal point F4 at a predetermined position, the magnetic material 900 is perforated, and an edge E21 corresponding to a part of the edge E1. Form.

  The magnetic material 900 punched by the die 92 moves in the longitudinal direction at least larger than the dimensions of the steel plates 70c and 70d. Then, after the mold 92 is moved in the direction connecting the center A2 of the arc of the teeth 92c and the focal point F4, the mold 92 is used to perforate the magnetic material 900, which corresponds to a part of the edge E3. The edge E22 to be formed is formed.

  And using the metal mold | die 94 which has the tooth | gear 94a which exhibits a pair of surface opened with a substantially sector-shaped center angle, it perforates | pierces with respect to the focus E4 to the opposite side to the edge E21 or the edge E22, and the steel plate 70c, A plurality of 70d are formed. By sequentially performing these steps while moving the die 92 continuously by a minute amount, the plurality of steel plates 70c and 70d to be punched have the same arc curvature and center angle, and the center of the arc. The shape in which the length in the direction connecting the arc and the focal point of the arc changes slightly. A plurality of the steel plates 70c and 70d thus obtained are stacked in the punched order to obtain divided bodies 40Aa-40Af, and a core 40A can be obtained by combining these divided bodies 40Aa-40Af.

<Third Embodiment>
<Device configuration>
As shown in FIGS. 7 and 8, the rotor 4B has a core 40B. The rotor 4B constitutes the inner rotor type rotating electrical machine 10 (see FIG. 1) together with the shaft 2 and the stator 6 instead of the rotor 4 shown in the first embodiment. In FIG. 8, the edge 62 inside the radial direction R of the stator 6 facing the rotor 4B outside the radial direction R of the rotor 4B is indicated by a one-dot chain line.

  The core 40B includes a plurality of divided bodies 40Ba-40Bf that are adjacent in the circumferential direction θ. Each of the divided bodies 40Ba-40Bf has a substantially fan shape in plan view, and its central angle is 60 degrees. In the present embodiment, since the six divided bodies 40Ba-40Bf are provided, the central angle is set to 60 degrees. However, according to the number n of divided bodies, the sector-shaped central angle exhibited by one divided body is 360 degrees / n. Each of the divided bodies 40Ba-40Bf exhibits a hole 52 and a margin E5B on at least one side of the hole 52 in the circumferential direction θ. In the present embodiment, the edge E5B is presented on both sides of the circumferential direction θ of the hole 52. Specifically, for example, the core 40B is equally divided in the circumferential direction θ in accordance with the number of field magnets 50 provided in the rotor 4B, and these are defined as divided bodies 40Ba-40Bf. Thus, if the cores 40B are formed by combining the divided bodies 40Ba-40Bf adjacent in the circumferential direction θ, it contributes to avoiding or suppressing the short circuit of the magnetic flux between the field magnets 50 adjacent in the circumferential direction θ.

<Production method>
The manufacturing method of division body 40Ba-40Bf is demonstrated. Each of the divided bodies 40Ba-40Bf is formed by laminating a plurality of steel plates 70e and 70f that are punched out in a substantially sector shape and exhibit a part of the edge E1 in the normal direction of the surface that the steel plates 70e and 70f exhibit. In addition, since the manufacturing method of each of the steel plates 70e and 70f is the same up to an intermediate process, in FIG. 9, the same process is shown in a unified manner, and the subsequent different processes are shown by a one-dot chain line branch. Yes.

  As shown in FIG. 9, for example, a U-shaped die 91 having a U-shaped tooth 91a having a substantially U-shape is used to perforate the magnetic material 900, which corresponds to part of the hole 52 and the edge E5B. The edge E91 to be formed is formed.

  Then, using a die 92B having long teeth 92a, 92b and teeth 92c having a predetermined shape, the magnetic material 900 is perforated, and sides corresponding to a part of the edges E7a, E7b An edge E11 corresponding to a part of the edge E10a and the edge E1 is formed. That is, the edge E5B is realized by the edges E91 and E10a.

  The magnetic material 900 punched by the die 92B moves in the longitudinal direction at least larger than the dimensions of the steel plates 70e and 70f. Then, after the mold 92B is moved in the direction connecting the center A2 of the arc presented by the teeth 92c and the focal point F4, the magnetic material 900 is punched using the mold 92B, and the edges E10a and E1 are formed. The edge E12 corresponding to a part is formed.

  And using the metal mold | die 94 which has the tooth | gear 94a, it perforate | pierces with respect to the focus E4 on the opposite side to the edge E11 or the edge E12, and forms several steel plate 70e, 70f. By sequentially performing these steps while moving the die 92B by a minute amount continuously, a plurality of the steel plates 70e and 70f to be punched are respectively within the steel plates 70e and 70f in which the edge E10a has a substantially fan shape. It exhibits a shape that moves continuously in small increments. A plurality of steel plates 70e and 70f obtained in this manner are stacked in the punched order to obtain divided bodies 40Ba-40Bf, and a core 40B can be obtained by combining these divided bodies 40Ba-40Bf.

  Thereby, the thickness (so-called bridge width) between the edge E5B and the edge E11 or the edge E12 can be made constant regardless of the position in the axial direction A.

<Fourth Embodiment>
<Device configuration>
As shown in FIGS. 10 and 11, the rotor 4 </ b> C has a core 40 </ b> C. The rotor 4C constitutes the inner rotor type rotating electrical machine 10 (see FIG. 1) together with the shaft 2 and the stator 6 instead of the rotor 4 shown in the first embodiment. In FIG. 11, the edge 62 inside the radial direction R of the stator 6 facing the rotor 4C outside the radial direction R of the rotor 4C is indicated by a one-dot chain line.

  The core 40C includes a plurality of divided bodies 40Ca-40Cf adjacent in the circumferential direction θ, and the two divided bodies 40Ca-40Cf adjacent in the circumferential direction θ cooperate to present one magnetic pole. The core 40C is generally a position where the core 40B shown in the third embodiment is different from the boundary between the divided bodies 40Ba-40Bf, specifically, a position obtained by rotating the boundary 30 degrees around the rotation axis Q. Can be grasped as having a divided body 40Ca-40Cf divided by the boundary. Here, the ends in the circumferential direction θ of the holes 52 adjacent to each other in the circumferential direction θ exhibit parallel edges E5Ca and E5Cb, and these edges E5Ca and E5Cb exhibit the edge E5C in the rotor 4C. The edge E5C functions as a magnetic barrier portion of the rotor 4C. Since the edges E5Ca and E5Cb are parallel to each other, when forming the edges E5Ca and E5Cb by drilling a magnetic material (not shown), one mold having teeth corresponding to the edges E5Ca and E5Cb is used. The edges E5Ca and E5Cb can be formed simultaneously by moving along one direction (for example, the radial direction R1 in the case of one divided body 40Ca shown in FIG. 11).

  However, the divided body 40Ca-40Cf exhibits a third arc C3 with the rotation axis Q as a focal point in a plan view on the bearing 1 side, and is more in the radial direction R than the third arc C3 on the opposite side to the bearing 1 side. A fourth arc C4 having the same curvature as the third arc C3 is present on the outside. As a result, on the side opposite to the bearing 1 side where the gap in the radial direction R between the rotor 4C and the stator 6 becomes larger, the shape swelled in the radial direction R closer to the magnetic pole center 54C in plan view. Present. Therefore, in the inner rotor type rotating electrical machine 10 (see FIG. 1), the air gap between the magnetic pole center 54C and the stator 6 can be reduced, and the cogging torque can be reduced.

<Fifth Embodiment>
<Device configuration>
As shown in FIG. 12, the rotor 4D has a core 40D. The rotor 4D constitutes an inner rotor type rotating electrical machine 10 (see FIG. 1) together with the shaft 2 and the stator 6 instead of the rotor 4 shown in the first embodiment. In FIG. 12, the edge 62 inside the radial direction R of the stator 6 facing the rotor 4D outside the radial direction R of the rotor 4D is indicated by a one-dot chain line.

  The rotor 4D is a rotor of a synchronous reluctance motor, and has a plurality (four in this embodiment) of divided bodies 40Da-40Dd that are adjacent in the circumferential direction θ. Each of the divided bodies 40Da-40Dd has a substantially fan shape in plan view, and its central angle is 90 degrees.

  Each of the divided bodies 40Da-40Dd exhibits a plurality of substantially arc-shaped voids (three in this embodiment) in plan view. Specifically, for example, each of the divided bodies 40Da-40Dd has a plurality of arc-shaped slits 52Da, 52Db, 52Dc that function as flux barriers in a plan view, and the divided bodies 40Da-40Dd are formed on the convex side of the arc. Are formed toward the opposite side (rotation axis Q) from the arc of each of. When the divided bodies 40Da-40Dd form the core 40D, an arc-shaped magnetic path is formed between the slits 52Da, 52Db, 52Dc. As a result, the gap between two slits 52Da adjacent in the circumferential direction θ functions as a magnetic pole center 54D. That is, in the present embodiment, the rotor 4D exhibits four magnetic poles.

  Each of the divided bodies 40Da-40Dd exhibits a third arc C3 in a plan view on the bearing 1 side, like the divided body 40Ca-40Cf shown in the fourth embodiment, and on the opposite side to the bearing 1 side. Presents a fourth arc C4. As a result, on the side opposite to the bearing 1 side where the gap in the radial direction R between the rotor 4D and the stator 6 becomes larger, the shape that swells in the radial direction R as it is closer to the magnetic pole center 54D in plan view. Present. In other words, the thickness of the core 40D in the radial direction R with respect to the rotation axis Q is the center 56D in the circumferential direction θ between the centers 54D of two magnetic poles adjacent in the circumferential direction θ on the side opposite to the bearing 1 side. Is small.

<Sixth Embodiment>
<Device configuration>
As shown in FIG. 13, the rotor 4E has a core 40E. The rotor 4E constitutes the inner rotor type rotating electrical machine 10 (see FIG. 1) together with the shaft 2 and the stator 6 instead of the rotor 4 shown in the first embodiment. In FIG. 13, the edge 62 inside the radial direction R of the stator 6 facing the rotor 4E outside the radial direction R of the rotor 4E is indicated by a one-dot chain line.

  The core 40E includes a plurality of divided bodies 40Ea-40Ed adjacent in the circumferential direction θ, and the two divided bodies 40Ea-40Ed adjacent in the circumferential direction θ cooperate to present one magnetic pole. The core 40E is generally a position where the core 40D shown in the fifth embodiment is different from the boundary between the divided bodies 40Da-40Dd, specifically, the boundary is rotated 45 degrees around the rotation axis Q. Can be grasped as having divided bodies 40Ea-40Ed divided by the boundary.

  However, the divided bodies 40Ea-40Ed exhibit a second arc C2 in a plan view on the bearing 1 side, and a first arc C1 on the side opposite to the bearing 1 side. As a result, on the side opposite to the bearing 1 side where the gap in the radial direction R between the rotor 4E and the stator 6 becomes larger, the shape swelled in the radial direction R closer to the magnetic pole center 54E in plan view. Present. Therefore, in the inner rotor type rotating electrical machine 10 (see FIG. 1), the air gap between the magnetic pole center 54C and the stator 6 can be reduced, and the cogging torque can be reduced.

<Seventh embodiment>
<Device configuration>
As shown in FIG. 14, the rotor 4F constitutes an outer rotor type rotating electrical machine 10F together with the shaft 2F, the bridging member 3F, and the stator 6F. The outer rotor type rotating electrical machine 10F is mounted on the compressor 100A. Here, FIG. 14 is a longitudinal sectional view of the compressor 100A, and shows a sectional view in a direction parallel to the extending direction of the shaft 2F.

  As shown in FIG. 14, the shaft 2 </ b> F has one end fixed on the bearing 1 side and the other end not fixed on the opposite side to the bearing 1 side. The shaft 2F has, for example, a concentric and rotatable double structure with the axial direction A as the center, a cylindrical portion 2Fa that is fixed to the bearing 1 with a substantially cylindrical body outside the radial direction R, and a radial direction R. And a cylindrical portion 2Fb fixed to the piston 91 in a substantially cylindrical shape.

  The stator 6F has an armature winding 61 and is fixed around the cylindrical portion 2Fa.

  The rotor 4F presents an edge E1 that surrounds the stator 6F via a gap along the radial direction R and faces the stator 6F. Specifically, it has a core 40F that exhibits a rotationally symmetric cylindrical body about the rotation axis Q. The core 40F has an edge E2F that defines an innermost edge that is the innermost edge in the radial direction R around the rotation axis Q (in the outer rotor type rotating electrical machine 10F, the edge E2F coincides with the edge E1). And the edge E3F that defines the outermost edge which is the outermost edge in the radial direction R.

  The core 40F is thicker in the radial direction R on the bearing 1 side than on the side opposite to the bearing 1 side.

  The core 40F and the shaft 2F are connected by a bridging member 3F. Specifically, the end portion of the core 40F opposite to the bearing 1 side and the end portion of the columnar portion 2Fb opposite to the bearing 1 side are connected by the bridging member 3F. Thereby, the rotation of the rotor 4F and the movement of the piston 91 are linked.

  In the rotor 4F of the outer rotor type rotating electrical machine 10F having such a shape, the end of the rotor 4F on the side to which the bridging member 3F is connected swings greatly during the operation of the compressor 100A. Therefore, by providing the first and second weights 22 and 20 on the core 40F, the unbalance of the rotational center of gravity of the rotor 4F is eliminated.

  As shown in FIG. 15, the core 40 </ b> F exhibits a plurality of magnetic poles extending in the circumferential direction θ and going inward in the radial direction R. Specifically, for example, an IPM rotor is employed for the rotor 4F. More specifically, the core 40F has a plurality of holes 52F penetrating in the axial direction A, and each of the holes 52F has a plurality of field magnets 50 embedded with the magnetic pole faces in the radial direction R. . More specifically, for example, the rotor 4F exhibits six holes 52F arranged at equal intervals in the circumferential direction θ. Accordingly, the rotor 4F exhibits six-fold rotational symmetry about the rotation axis Q.

  In the present embodiment, the edge E3 of the core 40F is a combination of arcs having the same curvature as the edge E2 on the rotation axis Q side of each hole 52F (in a shape similar to a so-called outer cycloid curve, The entire edge E3 shows the shape of a petal of a camellia in plan view. This is because, when the core 40F is formed by laminating a plurality of steel plates as in the first to sixth embodiments, the edges E2 and E3 are the same as in the manufacturing method shown in the first embodiment. There is an advantage that a steel plate can be formed by punching a magnetic material with arc-shaped teeth (not requiring a new die for punching the outermost edge of the steel plate).

  Then, one field magnet 50 is embedded in one hole 52F with the magnetic pole surface facing in the radial direction R1 at the center in the circumferential direction θ of the one hole 52F. A single field magnet 50 may be formed by combining a plurality of magnets. Thereby, energy saving, high efficiency, and a high torque motor can be obtained. FIG. 15 shows a plan view of the rotor 4F, and shows an edge 63 on the outer side in the radial direction R of the stator 6F facing the rotor 4F on the inner side in the radial direction R of the rotor 4F.

<Eighth Embodiment>
<Device configuration>
As shown in FIG. 16, the rotor 4G has a core 40G. The rotor 4G constitutes an outer rotor type rotating electrical machine 10F (see FIG. 14) together with the shaft 2F and the stator 6F instead of the rotor 4F shown in the seventh embodiment. In FIG. 16, the edge 63 on the outer side in the radial direction R of the stator 6F facing the rotor 4G on the inner side in the radial direction R of the rotor 4G is indicated by a one-dot chain line.

  The core 40G has a plurality of divided bodies 40Ga-40Gf adjacent in the circumferential direction θ. Each of the divided bodies 40Ga-40Gf exhibits the edge E5 on the hole 52F and at least one side in the circumferential direction θ of the hole 52F. In the present embodiment, the edge E5 is presented in both the circumferential directions θ of the holes 52F. Specifically, for example, the core 40G is equally divided in the circumferential direction θ in accordance with the number of field magnets 50 provided in the rotor 4G, and each is defined as a divided body 40Ga-40Gf. Each of the divided bodies 40Ga-40Gf exhibits at least one of the magnetic poles in the center in the circumferential direction θ. In the present embodiment, an aspect in which each of the divided bodies 40Ga-40Gf exhibits one magnetic pole is shown. One of the boundaries between one magnetic pole and the other magnetic pole adjacent in the circumferential direction θ substantially coincides with the edge in the circumferential direction θ of the divided body 40Ga-40Gf. Thus, if the core 40G is formed by combining the divided bodies 40Ga-40Gf adjacent in the circumferential direction θ, it contributes to avoiding or suppressing the short circuit of the magnetic flux between the field magnets 50 adjacent in the circumferential direction θ.

  Further, the divided body 40Ga-40Gf presents a first arc C5 having the rotation axis Q as a focal point in a plan view, and is parallel to the first arc C5 on the bearing 1 side outside the first arc C5 in the radial direction R. Presenting a second arc C6. Thereby, the air gap between the center of the magnetic pole and the stator 6F (see FIG. 14) can be reduced, and the cogging torque can be reduced.

<Ninth embodiment>
<Device configuration>
As shown in FIG. 17, the rotor 4H has a core 40H. The rotor 4H constitutes an outer rotor type rotating electrical machine 10F (see FIG. 14) together with the shaft 2F and the stator 6F instead of the rotor 4F shown in the seventh embodiment. In FIG. 17, the edge 63 on the outer side in the radial direction R of the stator 6F facing the rotor 4H on the inner side in the radial direction R of the rotor 4H is indicated by a one-dot chain line.

  The core 40H has a plurality of divided bodies 40Ha-40Hf adjacent in the circumferential direction θ, and the two divided bodies 40Ha-40Hf adjacent in the circumferential direction θ cooperate to form one magnetic pole (one field magnet 50). One hole 52H) to be accommodated is presented. The core 40H is generally a position obtained by rotating the core 40G shown in the eighth embodiment from the boundary between the divided bodies 40Ga-40Gf, specifically, by rotating the boundary by 30 degrees around the rotation axis Q. Can be grasped as having divided bodies 40Ha-40Hf divided by the boundary. Here, between the ends in the circumferential direction θ of the holes 52H adjacent to each other in the circumferential direction θ, the one divided body 40Ha exhibits parallel edges E5Ha and E5Hb, and the edges E5Ha and E5Hb are the rotor. The edge E5H is exhibited at 4H. The edge E5H functions as a magnetic barrier portion of the rotor 4H. Since the edges E5Ha and E5Hb are parallel to each other, when the edges E5Ha and E5Hb are formed by drilling in a magnetic material (not shown), one mold having teeth corresponding to the edges E5Ha and E5Hb is used. The edges E5Ha and E5Hb can be formed simultaneously by moving along one direction (for example, the radial direction R1 in the case of one divided body 40Ha shown in FIG. 17).

  However, the divided bodies 40Ha-40Hf exhibit a third arc C7 having the rotation axis Q as a focal point in a plan view, and on the bearing 1 side, the third arc C7 is formed outside the third arc C7 in the radial direction R. A parallel fourth arc C8 is presented. Thereby, the air gap between the rotor 4H and the stator 6F (see FIG. 14) can be reduced, and the cogging torque can be reduced.

<Modification>
As mentioned above, although the suitable aspect of this invention was demonstrated, this invention is not limited to this. For example, in the above first to ninth embodiments, the rotor mounted on the synchronous reluctance motor has four magnetic poles (fifth and sixth embodiments) and the IPM motor. Although the embodiment has been described in which the number of magnetic poles is six (the first to fourth embodiments and the seventh to ninth embodiments) as the rotor, other numbers may be used. Moreover, in the said 7th Embodiment, the edge E3 of the core 40F on the opposite side to the rotating shaft Q of each hole 52F exhibits the shape (petal shape of a camellia) resembling what is called an outer cycloid curve in planar view. However, the present invention may be in the form of a perfect circle centered on the rotation axis Q. Moreover, you may combine the above-mentioned embodiment suitably.

A axial direction C1, C5 first arc C2, C6 second arc C3, C7 third arc C4, C8 fourth arc E1 (first) edge E2 (second) edge E3 (first 3) edge E4 (fourth) edge E5, E5A-E5C (fifth) edge Pw1 first position Pw2 second position Q rotation axis R radial direction θ circumferential direction 2 shaft 4, 4A- 4H rotor 20 weight 40, 40A-40H core 40Aa-40Af, 40Ba-40Bf, 40Ca-40Cf, 40Da-40Dd, 40Ea-40Ed, 40Ga-40Gf, 40Ha-40Hf divided body 50 field magnets 52, 52A-52E, 52H hole 54, 54A-54E circumferential center of magnetic pole 56, 56A-56E circumferential center of magnetic pole 70 steel plate 100, 100A compressor

Claims (17)

Extending along a rotation axis (Q) parallel to the axial direction (A), one end of the axial direction is rotatably fixed around the rotational axis, and the other end of the axial direction is The first edge (E1) is fixed to the shaft (2) having the other end not fixed and is opposed to the stator through a gap along the radial direction (R) with the rotation axis as the center. A rotor (4, 4A-4H),
A core (40, 40A-40H) formed by laminating a plurality of steel plates (70) punched into a predetermined shape in parallel with the normal direction of the surface exhibited by the steel plates in parallel to the axial direction;
The core includes a second edge (E2) that defines an innermost edge that is the innermost edge in the radial direction, and a third edge that defines an outermost edge that is the outermost edge in the radial direction ( E3)
The thickness in the radial direction of the core between the second edge and the third edge on the radially outer side is smaller at the other end than at the one end.
The first edge exhibits an arc having the same curvature at the one end and the other end in plan view from the axial direction.
Rotor. The core (40, 40A-40E) is surrounded by the stator via the gap,
The core exhibits a plurality of holes (52, 52A-52E) that penetrate in the axial direction (A) and are adjacent in the circumferential direction (θ) around the rotation axis (Q).
The rotor (4, 4A-4E) according to claim 1. The core (40, 40A-40E) exhibits a plurality of magnetic poles extending in the circumferential direction (θ) and going outward in the radial direction (R),
The radial thickness of the core from the rotation axis (Q) is as follows:
Regardless of the position in the axial direction, the two magnetic poles adjacent to each other in the circumferential direction at the same axial position as the center rather than the center in the circumferential direction (54, 54A-54E) of the one magnetic pole. Smaller in the circumferential center (56, 56A-56E) of
The rotor (4, 4A-4E) according to claim 2. The core (40, 40A-40E) is surrounded by the stator via the gap, and exhibits a plurality of magnetic poles extending in the circumferential direction (θ) and going outward in the radial direction (R),
The thickness of the steel sheet in the radial direction with respect to the rotation axis (Q) is more than two of the magnetic poles adjacent in the circumferential direction than the circumferential center (54, 54A-54E) of the one magnetic pole. Smaller at the circumferential center of each other (56, 56A-56E),
The rotor (4, 4A-4E) according to claim 1. The core (40A, 40B, 40E) includes a plurality of adjacent divided bodies (40Aa-40Af, 40Ba-40Bf, 40Ea-40Ed) in the circumferential direction (θ),
Each of the divided bodies presents at least one of the magnetic poles in the center in the circumferential direction,
One of the boundaries between the one magnetic pole adjacent to the circumferential direction and the other magnetic pole substantially coincides with the circumferential edge of the divided body.
The rotor (4A, 4B, 4E) according to claim 3. The divided bodies (40Aa-40Af, 40Ba-40Bf, 40Ea-40Ed) exhibit a first arc (C1) having the rotation axis (Q) as a focal point in the plan view at the other end, and Presenting a second arc (C2) parallel to the first arc outside the radial direction (R) at the side end portion than the first arc;
The rotor (4A, 4B, 4E) according to claim 5. The core (40C, 40D) includes a plurality of adjacent divided bodies (40Ca-40Cf, 40Da-40Dd) in the circumferential direction (θ),
The two division bodies adjacent in the circumferential direction cooperate to present one magnetic pole.
The rotor (4C, 4D) according to claim 3. The divided body (40Ca-40Cf, 40Da-40Dd) exhibits a third arc (C3) having the rotation axis (Q) as a focal point in the plan view at the one side end, and at the other side end. Presenting a fourth arc (C4) parallel to the third arc outside the radial direction (R) than the third arc;
The rotor (4C, 4D) according to claim 7. A plurality of field magnets (50);
The field magnet is embedded in the core (40, 40A-40C) with its magnetic pole surface facing the radial direction (R).
The rotor (4, 4A-4C) according to claim 2. The core (40, 40A-40C) is between the field magnets (50) adjacent in the circumferential direction (θ) and the radial direction (R) of the hole (52, 52A-52C). A fifth side presenting at least one gap along the axial direction (A) in the region between the fourth side edge (E4) inside the first side edge (E1) and the first side edge (E1) Presents edges (E5, E5A-E5C),
The rotor (4, 4A-4C) according to claim 9. The core (40F-40H) surrounds the stator via the gap,
A plurality of field magnets (50);
The field magnet penetrates in the axial direction (A) and is adjacent in the circumferential direction (θ) with the rotation axis (Q) as the center, and the magnetic pole surface faces the radial direction (R) and the core Embedded in the
The rotor (4F-4H) according to claim 1. The core (40G) has a plurality of adjacent divided bodies (40Ga-40Gf) in the circumferential direction (θ),
Each of the divided bodies presents at least one of the magnetic pole faces at the center in the circumferential direction,
One of the boundaries between the one magnetic pole surface adjacent in the circumferential direction and the other magnetic pole surface substantially coincides with the circumferential edge of the divided body.
The rotor (4G) according to claim 11. The divided body (40Ga-40Gf) exhibits a first arc (C5) having the rotation axis (Q) as a focal point in the plan view at the other side end, and the first end at the other side end. Presenting a second arc (C6) parallel to the first arc outside the arc in the radial direction (R);
The rotor (4G) according to claim 12. The core (40H) includes a plurality of adjacent divided bodies (40Ha-40Hf) in the circumferential direction (θ),
The two divided bodies adjacent in the circumferential direction cooperate to form one hole (52F) that houses the field magnet (50).
The rotor (4H) according to claim 11. The divided body (40Ha-40Hf) exhibits a third arc (C7) having the rotation axis (Q) as a focal point in the plan view at the one side end, and the third end at the other side end. Presenting a fourth arc (C8) parallel to the third arc outside the radial direction (R) from the focal point of the arc;
The rotor (4H) according to claim 14. A weight (20) having a center of gravity at a first position (Pw1) separated from the rotation axis (Q) in plan view from the axial direction (A);
The core (40, 40A-40H) is provided adjacent to the weight on the one side,
The rotor (4, 4A-4H) according to any one of claims 1 to 15. A compressor (100, 100A) equipped with the rotor (4, 4A-4H) according to any one of claims 1 to 16,
The center of gravity when the shaft (2) rotates is at a second position (Pw2) away from the rotation axis (Q).

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