JP2016077032A - Multilayer core, synchronous motor and motor compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a flow of a magnetic flux from being blocked by a caulking part 84 and a support rod member 63.SOLUTION: In a multilayer core 60 of a rotor 40 of a synchronous motor 1, the caulking part 84 and the support rod member 63 for connecting a plurality of annular core plates 61 in a direction of an axial line S1 are provided as connection parts. The caulking part 84 and the support rod member 63 are disposed for each of permanent magnets 70 in portions where a magnetic flux density becomes coarse, in the multilayer core 60 in the state where a magnetic flux generated by an armature 50 for generating a rotary magnetic field in the armature 50 is superposed with a magnetic flux generated by the permanent magnet 70.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a laminated core, a synchronous motor, and an electric compressor.

  Conventionally, in a laminated core of a synchronous motor rotor in which a plurality of annular core plates are laminated in the axial direction, a permanent magnet insertion hole into which a permanent magnet is inserted and a plurality of annular core plates are connected by caulking coupling. A thing provided with a plurality of caulking parts is proposed (for example, patent documents 1).

  In order to prevent the plurality of caulking portions from adversely affecting the flow of the magnetic flux of the rotor, the plurality of caulking portions are arranged in a wavy pattern. Specifically, among the plurality of caulking portions, the caulking portions arranged in the radial direction from the center of the rotor and on the inner peripheral side of the permanent magnet insertion hole center are located on the inner peripheral sides of both ends of the permanent magnet insertion hole. Compared to the caulking portion that is disposed, it is provided in a portion closer to the permanent magnet insertion hole.

Japanese Patent No. 5293933

  In the laminated core 60 </ b> A of the rotor of Patent Document 1 described above, of the plurality of caulking portions 1, the caulking portion 1 a disposed radially from the center of the rotor and on the inner peripheral side of the center of the permanent magnet insertion hole 2. Is provided in a portion closer to the permanent magnet insertion hole 2 than the caulking portion 1b disposed on the inner peripheral side of the both end positions of the permanent magnet insertion hole 2 (see FIG. 12).

  However, according to studies by the inventors, the magnetic flux generated by the armature is superimposed on the magnetic flux generated by the permanent magnet at the actual load in which the armature of the synchronous motor is energized. For this reason, the part where the magnetic flux density is sparse in the laminated core 60 </ b> A moves in the rotational direction from “a part on the radial direction from the center o of the rotor and on the inner peripheral side of the center of the permanent magnet insertion hole 2”. Therefore, the caulking portion 1a is detached from the sparse part of the laminated core. For this reason, the caulking part 1a obstructs the flow of magnetic flux and reduces the output torque of the synchronous motor. In FIG. 12, S <b> 2 is a center line extending radially from the center o of the rotor and extending to the center of the permanent magnet insertion hole 2.

  Such a problem is not limited to the case of the synchronous motor including the caulking portion 1a. For example, an inner rotor as a compressor is disposed radially inward with respect to the laminated core of the synchronous motor, and the laminated core has a connection plate. This also occurs in the electric compressor that rotatably supports the inner rotor.

  That is, if the hinge portion supported by the laminated core of the connecting plate is out of the portion of the laminated core where the magnetic flux density is sparse, the hinge portion inhibits the flow of magnetic flux and reduces the output torque of the synchronous motor. Reduce.

  In view of the above-described points, an object of the present invention is to provide a laminated core, a synchronous motor, and an electric compressor that suppress the inhibition of the flow of magnetic flux and improve output torque.

In order to achieve the above object, according to the first aspect of the present invention, the laminated core (60) and the axial line are formed by laminating a plurality of annular core plates (61) formed in an annular shape around the axial line in the axial direction. A rotor (40) having a plurality of magnets (81) that are arranged in a circumferential direction centered on each other and each form a magnetic pole in a radial direction centered on the axis,
A laminated core applied to a synchronous motor including an armature (50) disposed in a radial direction about an axis with respect to a rotor and generating a rotating magnetic field toward the rotor;
A connecting portion (63, 84) for connecting a plurality of annular core plates across the stacking direction of the annular core plates,
In a state where the magnetic flux generated by the armature and the magnetic flux generated by the plurality of magnets are overlapped in order for the armature to generate the rotating magnetic field, the connecting portion is disposed in a portion of the laminated core where the magnetic flux density is sparse. It is characterized by that.

  According to the first aspect of the present invention, since the connecting portion is arranged in the portion of the laminated core where the magnetic flux density is sparse, it is possible to suppress the magnetic flux from being hindered by the connecting portion. For this reason, the output torque of a synchronous motor can be improved.

  Specifically, in the invention according to claim 2, the imaginary line connecting the circumferential central portion and the center of the annular core plate among any one of the plurality of magnets is the center line of any one magnet. (S2) When θ is the electrical angle of the synchronous motor satisfying 0 deg <θ <90 deg, the connecting portion is arranged at a position shifted by θ in the rotation direction of the rotor from the center line of any one of the magnets. It is characterized by being.

  The intermediate position between the second magnet (70B) and the first magnet (70A) arranged in the rotation direction with respect to the first magnet (70A) is connected to the center point (o) of the annular core plate. When the virtual line (S3) is drawn, 90 deg (= electrical angle θ) is calculated from the center line (S2) to the virtual line (S3) between the center line (S2) and the virtual line (S3) of the first magnet. Is an angle formed in the rotational direction (see FIG. 2).

In the invention according to claim 10, the rotor core (60) formed in a cylindrical shape and the rotor core (60) are arranged in a circumferential direction centered on the axis of the rotor core, respectively, and are respectively in a radial direction centered on the axis. A rotor (40) having a plurality of magnets (81) that form magnetic poles toward the rotor, and an armature that generates a rotating magnetic field toward the rotor that is arranged in a radial direction about the axis with respect to the rotor. 50), and a synchronous motor in which a rotor rotates in synchronization with a rotating magnetic field,
A structure (20) disposed radially inward with respect to the rotor core as a center,
The rotor core includes a fitting portion (91) for connecting to the structure by fitting,
A fitting part is arrange | positioned in the site | part where magnetic flux density is sparse among laminated cores, It is characterized by the above-mentioned.

  According to the tenth aspect of the present invention, since the fitting portion is arranged in a portion of the rotor core where the magnetic flux density is sparse, the magnetic flux flow is prevented from being obstructed by the fitting portion. Can do. For this reason, the output torque of a synchronous motor can be improved.

In the invention of claim 13, the rotor core (60) formed in a cylindrical shape and the circumferential direction centered on the axis of the rotor core are arranged in a radial direction centered on the axis, respectively. A rotor (40) having a plurality of magnets (81) that form magnetic poles toward the rotor, and an armature that generates a rotating magnetic field toward the rotor that is arranged in a radial direction about the axis with respect to the rotor. 50), and a synchronous motor (1A) in which a rotor rotates in synchronization with a rotating magnetic field,
Between the rotor core and the inner peripheral surface of the rotor core, the rotor core is rotated by a rotational force transmitted from the rotor core through the connecting member (160). An electric compressor comprising a compressor (150) for compressing a refrigerant,
In a state where the magnetic flux generated by the armature and the magnetic flux generated by the plurality of magnets are superimposed so that the armature generates a rotating magnetic field, the supported portion (161) supported by the rotor core among the connecting members is laminated. It arrange | positions in the site | part where magnetic flux density is sparse among cores, It is characterized by the above-mentioned.

  According to the thirteenth aspect of the present invention, since the support portion is disposed at a portion of the laminated core where the magnetic flux density is sparse, it is possible to suppress the magnetic flux flow from being inhibited by the support portion. For this reason, the output torque of a synchronous motor can be improved.

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

It is sectional drawing which shows the cross-sectional structure of the synchronous motor in 1st Embodiment of this invention. It is the figure which looked at the lamination core of Drawing 1 from the direction of an axis. It is sectional drawing which shows the structure of the crimping part of FIG. It is a figure which shows the magnetic flux density of the lamination | stacking core of FIG. 1 at the time of no load. It is a figure which shows the magnetic flux density of the lamination | stacking core of FIG. 1 at the time of an actual load. It is a figure which shows the relationship between the position of the connection part of FIG. 1, and a torque. It is sectional drawing in the lamination | stacking core and shaft of the synchronous motor of 2nd Embodiment of this invention. It is sectional drawing in the lamination | stacking core of the synchronous motor of 3rd Embodiment of this invention. It is sectional drawing which shows the cross-sectional structure of the electric compressor in 4th Embodiment of this invention. It is XX sectional drawing in FIG. It is sectional drawing which shows the compression operation | movement of the electric compressor of FIG. It is a figure which shows a permanent magnet insertion hole and a caulking part in a comparative example.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, parts that are the same or equivalent to each other are given the same reference numerals in the drawings in order to simplify the description.

(First embodiment)
1 and 2 show a first embodiment of a synchronous motor 1 according to the present invention.

  The synchronous motor 1 of this embodiment is a three-phase AC motor including a housing 10, a shaft 20, bearings 30 a and 30 b, a rotor 40, and an armature 50. The housing 10 is formed in a cylindrical shape.

  One side in the axial direction of the housing 10 is closed by the bottom 11. The bottom portion 11 is provided with a through hole 11a penetrating in the axial direction. The other side in the axial direction of the housing 10 is closed by the lid portion 12. The lid portion 12 is provided with a through hole 12a penetrating in the axial direction.

  The shaft 20 passes through the through hole 11a in the bottom portion 11 and the through hole 12a in the lid portion 12, respectively. The bearing 30a is supported by the bottom part 11, and supports the shaft 20 rotatably. The bearing 30b is supported by the cover part 12, and supports the shaft 20 rotatably.

  The rotor 40 is accommodated in the housing 10. The rotor 40 is formed in a cylindrical shape whose axis S1 coincides with the axis of the shaft 20. The rotor 40 is disposed on the outer side in the radial direction with the axis o as the center o with respect to the shaft 20. The rotor 40 is supported by the shaft 20. Details of the structure of the rotor 40 will be described later.

  The armature 50 is disposed on the radially outer side with the axis S1 as the center o with respect to the rotor 40. The armature 50 is composed of a plurality of armature coils 52 that are wound around a stator core 51. The plurality of coils 52 are arranged at the same interval in the circumferential direction with the axis S1 of the shaft 20 as the center o. The armature 50 is supported by the inner peripheral surface 13 of the housing 10. In the present embodiment, an armature having a distributed winding structure is used as the armature 50.

  Next, details of the structure of the rotor 40 of the present embodiment will be described with reference to FIGS.

  The rotor 40 includes a laminated core 60 and a plurality of permanent magnets 70. The laminated core 60 is a rotor core including a plurality of annular core plates 61, end plates 62a and 62b, and a plurality of support bars 63. The plurality of annular core plates 61 are stacked in the direction of the axis S1. As shown in FIG. 2, each of the plurality of annular core plates 61 is formed in an annular shape having an axis S1 as a center o. As each of the plurality of annular core plates 61, a plate-like and annular magnetic body formed so as to be covered with an electrical insulating layer is used.

  Each of the plurality of annular core plates 61 is provided with a plurality of through holes 80 penetrating in the axial direction. In the present embodiment, the annular core plate 61 is provided with eight through holes 80 for each annular core plate 61.

  Here, the number of each of the permanent magnets 70 and the support bar 63 is the same as the number of the through holes 80, and the number of the armature coils 52 per phase is the same as the number of the through holes 80. ing. Therefore, hereinafter, for convenience of explanation, an example in which eight through holes 80, eight permanent magnets 70, eight support rods 63, and 24 armature coils 52 are provided will be described. The 24 armature coils 52 represent the armature coils 52 for three phases of the U phase, the V phase, and the W phase.

  The eight through holes 80 are each formed in the same shape. The eight through holes 80 are arranged at equal intervals in the circumferential direction with the axis S1 as the center o. Each of the eight through holes 80 is formed symmetrically about a center line S2 extending in the radial direction with the axis line S1 as the center o. Specifically, the through-hole 80 is formed in a rectangular shape extending in a direction orthogonal to the center line S2 when viewed from the axial direction.

  Here, for every two adjacent annular core plates 61 among the plurality of annular core plates 61, the through holes 80 of the two adjacent annular core plates 61 communicate with each other. As a result, eight through holes 80 communicate with each other for each annular core plate 61, and eight permanent magnet insertion holes 81 are formed in the laminated core 60. The eight permanent magnet insertion holes 81 are arranged at equal intervals in the circumferential direction with the axis S1 as the center o.

  In the eight permanent magnet insertion holes 81 configured as described above, a permanent magnet 70 is disposed for each permanent magnet insertion hole 81. That is, the eight permanent magnets 70 are each embedded in the laminated core 60. The eight permanent magnets 70 are formed along the axial direction of the laminated core 60 for each permanent magnet insertion hole 81. The eight permanent magnets 70 are formed in the same shape for each permanent magnet insertion hole 81. The eight permanent magnets 70 are formed symmetrically about each permanent magnet 70 with the axis line S1 as the center o and the center line S2 extending in the radial direction as the center line.

  The eight permanent magnets 70 each form eight magnetic poles in the radial direction centered on the axis S1. The eight magnetic poles are formed so that the S poles and the N poles are alternately positioned in the circumferential direction centered on the axis S1.

  Each of the plurality of annular core plates 61 is provided with eight through holes 82 penetrating in the direction of the axis S1. The eight through holes 82 are arranged at the same interval in the circumferential direction with the axis S1 as the center o. The eight through holes 82 are each formed in the same shape. The eight through holes 82 are arranged on the inner side in the radial direction with the axis S1 as the center o with respect to the through hole 80 for each through hole 80.

  Here, the through holes 82 of the two adjacent annular core plates 61 communicate with each other between the two adjacent annular core plates 61 among the plurality of annular core plates 61. Thus, eight through holes 82 communicate with each other for each annular core plate 61, and eight communication holes 83 are formed in the laminated core 60. The eight communication holes 83 are arranged at the same interval in the circumferential direction with the axis S1 as the center o.

  The eight communication holes 83 configured as described above are penetrated by the support bar 63 for each communication hole 83. The eight support rods 63 are supported by end plates 62a on one side in the axial direction. The other axial side of each of the eight support rods 63 is supported by the end plate 62b. The end plate 62 a is disposed on one side in the axial direction with respect to the plurality of annular core plates 61. The end plate 62 b is disposed on the other side in the axial direction with respect to the plurality of annular core plates 61.

  As a result, the plurality of annular core plates 61 are held between the end plates 62a and 62b. That is, the plurality of annular core plates 61 are connected by the eight support rods 63 and the end plates 62a and 62b. The positions of the eight communication holes 83 will be described later.

Each of the plurality of annular core plates 61 has eight caulking portions 84 formed therein.
The eight caulking portions 84 are obtained by caulking the annular core plate 61 in a state where the plurality of annular core plates 61 are stacked when the rotor 40 is manufactured. The eight caulking portions 84 are arranged on the inner side in the radial direction with the axis S1 as the center o with respect to the through hole 80 for each through hole 80. The eight caulking portions 84 are portions that connect the two annular core plates 61 by caulking connection for every two adjacent annular core plates 61 among the plurality of annular core plates 61.

  FIG. 3 shows a schematic diagram of the caulking portion 84 formed on the two annular core plates 61. For each annular core plate 61, the caulking portion 84 protrudes on the one axial side 61 a side of the annular core plate 61 on the one axial side, and on the other axial side 61 b of the annular core plate 61 on the one axial side. It is formed to be recessed. For this reason, the caulking portion 84 of one annular core plate 61 out of the two annular core plates 61 is fitted into the caulking portion 84 of the other annular core plate 61 for every two annular core plates 61. For this reason, the plurality of annular core plates 61 are connected by the eight caulking portions 84 for each annular core plate 61.

  Here, the caulking portion 84 and the through hole 82 are disposed on the radially inner side with respect to the permanent magnet 70. The caulking portion 84 is offset in the rotational direction with respect to the through hole 82. The area of the cross section orthogonal to the axis of the through hole 82 is larger than the area of the cross section orthogonal to the axis of the caulking portion 84.

  In the present embodiment, the caulking portion 84 and the through-hole 82 are, as will be described later, the annular core plate 61 during an actual load in which the magnetic flux generated by the armature coil 52 and the magnetic flux generated by the permanent magnet 70 are superimposed. Of these, the magnetic flux density is arranged at a sparse part. In particular, the through hole 82 is disposed in a portion of the annular core plate 61 where the magnetic flux density is the least sparse during an actual load.

  Next, the operation of the synchronous motor 1 of the present embodiment will be described with reference to FIGS. 4 and 5.

  The synchronous motor 1 of the present embodiment operates based on a three-phase alternating current that flows from the inverter circuit to the plurality of armature coils 52.

  First, when no current is output from the inverter circuit (not shown) to the 24 armature coils 52, magnetic flux generated by the eight permanent magnets 70 flows through the laminated core 60. Specifically, among the eight permanent magnets 70, magnetic flux flows between the magnetic poles of two permanent magnets 70 adjacent to each other in the circumferential direction centered on the axis S1. For this reason, the density of the magnetic flux density of the laminated core 60 is formed as the contour lines in FIG. 4 and 5, reference numeral M <b> 1 indicates a portion of the laminated core 60 where the magnetic flux density is the least sparse. In FIG. 4, M <b> 1 is the position of two adjacent permanent magnets 70 on the radially inner side of the permanent magnet 70 and on the circumferential center of the permanent magnet 70 and on the radially outer side of the laminated core 60. It is set to the part between.

  Next, in an actual load in which a three-phase alternating current is output from the inverter circuit to the 24 armature coils 52, the 24 armature coils 52 rotate toward the rotor 40 based on the three-phase alternating current. Magnetic flux is generated to generate a magnetic field. The magnetic flux generated by the 24 armature coils 52 flows on the corresponding permanent magnet 70 side among the eight permanent magnets 70. For this reason, in the laminated core 60, the magnetic flux generated by the armature coil 52 and the magnetic flux generated by the permanent magnet 70 are superimposed for each permanent magnet 70. For this reason, the density of the magnetic flux density changes for each permanent magnet 70 in the laminated core 60, as shown in FIG. In particular, a portion M1 where the magnetic flux density is sparser in the radial direction with respect to the permanent magnet 70 in the laminated core 60 moves in the rotational direction. With the magnetic flux density changed in this way, the rotor 40 rotates together with the shaft 20 in synchronization with the rotating magnetic field generated from the 24 armature coils 52.

  In the present embodiment described above, the caulking portion 84 and the support bar 63 constitute a connecting portion that connects the plurality of annular core plates 61 in the stacking direction (that is, the axial direction). When the caulking portion 84 and the support bar 63 are arranged in a portion of the laminated core 60 where the magnetic flux density is dense, the caulking portion 84 and the support bar 63 obstruct the flow of magnetic flux flowing through the laminated core 60.

  Here, in the laminated core 60, a center line shifted from the center line S2 of one permanent magnet 70A (see FIG. 2) by an electrical angle 90 (deg) in the rotation direction is defined as a center line S3. If the permanent magnet located in the rotational direction with respect to the permanent magnet 70 </ b> A among the eight permanent magnets is the permanent magnet 70 </ b> B, the center line S <b> 3 is a virtual line connecting the intermediate position of the permanent magnets 70 </ b> A and 70 </ b> B and the center o of the laminated core 60. Become a line. Between the center line S2 and the center line S3, a magnetic flux density is sparse in a region formed radially inward with respect to the permanent magnet 70A and in the rotational direction from the center line S2 to the center line S3.

  Therefore, in the present embodiment, the caulking portion 84 and the support bar 63 are disposed in a portion of the laminated core 60 where the magnetic flux density is sparse.

  In other words, in the present embodiment, the caulking portion 84 and the support bar 63 are disposed at a portion shifted from the center line S2 by the electrical angle θ in the rotation direction.

  θ is an electrical angle of the synchronous motor 1 and satisfies “zero (deg) <θ <90 (deg)” and satisfies the following formula 1.

Electrical angle θ = rotation angle of rotor 40 (mechanical angle)
÷ Number of pole pairs of rotor 40 (Equation 1)
In the present embodiment using eight permanent magnets 70, the number of pole pairs is four.

  In the present embodiment, the area of the cross section orthogonal to the axial direction of the through hole 82 (support bar 63) is larger than the area of the cross section orthogonal to the axial direction of the caulking portion 84. As a result, the support bar 63 may greatly inhibit the flow of magnetic flux as compared with the caulking portion 84. Therefore, the support bar 63 is disposed in a portion of the laminated core 60 where the magnetic flux density is sparse for each permanent magnet 70.

  Next, the effect of this embodiment will be described with reference to FIG.

  FIG. 6 shows the result of examining the change in the output torque of the synchronous motor 1 by simulation when the electrical angle θ indicating the position of the caulking portion 84 and the support bar 63 is changed from zero (deg) to 180 (deg). .

  According to FIG. 6, when 0 (deg) <θ <90 (deg) is satisfied, the output torque of the synchronous motor 1 is larger than when 90 (deg) <θ <180 (deg) is satisfied. I understand that.

  According to the present embodiment described above, the synchronous motor 1 includes the rotor 40 and the armature 50. The rotor 40 includes a laminated core 60 in which eight annular core plates 61 formed in an annular shape with the axis S1 as the center o are laminated in the direction of the axis S1, and a circumferential direction with the axis S1 as the center o. The eight permanent magnets 70 are arranged at the same interval and each form a magnetic pole in the radial direction centered on the axis S1. The armature 50 is disposed on the radially outer side with the axis S1 as the center o with respect to the rotor 40 and generates a rotating magnetic field toward the rotor 40. The laminated core 60 is provided with a caulking portion 84 and a support bar 63 for connecting a plurality of annular core plates 61 in the direction of the axis S1 as connecting portions. The caulking portion 84 and the support bar 63 are magnetic flux densities of the laminated core 60 in a state where the magnetic flux generated by the armature 50 and the magnetic flux generated by the permanent magnet 70 are superimposed in order for the armature 50 to generate a rotating magnetic field. It is characterized by being arranged for each of the permanent magnets 70 in a portion where the sparseness is sparse.

  Therefore, it can suppress that the flow of magnetic flux is inhibited by the caulking portion 84 and the support bar 63. For this reason, the output torque of the synchronous motor 1 can be improved.

  In the present embodiment, the area of the cross section perpendicular to the axial direction of the support bar 63 is larger than the area of the cross section perpendicular to the axial direction of the caulking portion 84. Therefore, the support bar 63 is disposed in a portion of the laminated core 60 where the magnetic flux density is sparse for each permanent magnet 70. Therefore, it is possible to reliably suppress the inhibition of the flow of magnetic flux by the support bar 63.

(Second Embodiment)
In the second embodiment, an example in which a fitting structure for fitting the shaft 20 to the laminated core 60 in the synchronous motor 1 of the first embodiment will be described.

  FIG. 7 is a view showing a cross section in a direction perpendicular to the axial direction in the laminated core 60 and the shaft 20 of the synchronous motor 1 of the present embodiment.

  In the laminated core 60 of the present embodiment, a concave portion 91 that is recessed radially outward is provided as a fitting portion on a radially inner side (inner peripheral surface) 90 centered on the axis S1. The recess 91 is formed across the direction of the axis S <b> 1 of the laminated core 60.

  A convex portion 101 that protrudes radially outward is provided on the radially outer side (outer peripheral surface) 100 centering on the direction of the axis S1 in the shaft 20. The convex portion 101 is formed across the direction of the axis S <b> 1 of the laminated core 60. Since the convex portion 101 of the shaft 20 is fitted into the concave portion 91 of the laminated core 60, the laminated core 60 and the shaft 20 are connected. Accordingly, it is possible to fulfill the function of preventing rotation of the laminated core 60 with respect to the shaft 20.

  The concave portion 91 and the convex portion 101 are disposed radially inward with respect to one permanent magnet 70 </ b> A among the eight permanent magnets 70. Similar to the caulking portion 84 and the support bar 63 of the first embodiment, the concave portion 91 and the convex portion 101 are arranged at a position shifted from the center line S2 by the electrical angle θ in the rotation direction. As described above, the electrical angle θ satisfies (zero (deg) <θ <90 (deg)). Thereby, the recessed part 91 and the convex part 101 are arrange | positioned in the site | part from which the magnetic flux density is sparse among the lamination | stacking cores 60. FIG.

  In particular, the area of the cross section orthogonal to the axial direction of the convex portion 101 is larger than the area of the cross section orthogonal to the axial direction of the caulking portion 84. Therefore, the concave portion 91 and the convex portion 101 are disposed in a portion of the laminated core 60 where the magnetic flux density is the least sparse.

  The eight permanent magnets 70 are all the same, but for convenience of explanation, the permanent magnet 70 disposed radially outward with respect to the concave portion 91 and the convex portion 101 is referred to as a permanent magnet 70A.

  In the present embodiment, the caulking portion 84 is provided on the radially inner side of the laminated core 60 with respect to the permanent magnet 70A, but the support bar 63 is not provided. The caulking portion 84 and the support bar 63 are provided corresponding to the seven permanent magnets 70 other than the permanent magnet 70 </ b> A among the eight permanent magnets 70.

  According to the present embodiment described above, the concave portion 91 and the convex portion 101 are arranged in a portion of the laminated core 60 where the magnetic flux density is sparsest, on the radially inner side with respect to the permanent magnet 70A. For this reason, it can suppress that the flow of magnetic flux is inhibited by the recessed part 91 and the convex part 101. FIG. Therefore, the output torque of the synchronous motor 1 can be improved.

(Third embodiment)
In the first and second embodiments, the example in which one magnetic pole facing the radially outer side (or radially inner side) is formed by one permanent magnet 70 is described. Instead, the third embodiment is described. In the embodiment, an example in which one magnetic pole is formed by a pair of permanent magnets will be described.

  FIG. 8 is a view showing a cross section in a direction orthogonal to the axial direction in the laminated core 60 of the synchronous motor 1 of the present embodiment.

  In the rotor 40 of the synchronous motor 1 of the present embodiment, eight pairs of permanent magnets 70a and 70b are arranged instead of the eight permanent magnets 70 in FIG. Therefore, one of the S pole and the N pole is formed on the radially outer side of each of the permanent magnets 70a and 70b forming a pair, and the S pole is placed on the radially inner side of each of the permanent magnets 70a and 70b. And the other of the N poles other than the one is formed.

  The pair of permanent magnets 70a and 70b are formed in line symmetry with a center line S2 extending in the radial direction centered on the axis S1 as a center line. The pair of permanent magnets 70a and 70b are arranged in a square shape. Specifically, the pair of permanent magnets 70a and 70b are arranged so that the dimension between the pair of permanent magnets 70a and 70b increases toward the outside in the radial direction.

  In the present embodiment described above, the caulking portion 84 and the support bar 63 are provided for each pair of permanent magnets 70a and 70b. The caulking portion 84 and the support bar 63 are arranged in a portion of the laminated core 60 where the magnetic flux density is sparse. In particular, the support bar 63 is disposed in a portion of the laminated core 60 where the magnetic flux density is sparse for each permanent magnet 70. For this reason, it can suppress that the flow of magnetic flux is inhibited by the caulking part 84 and the support bar 63 similarly to the said 1st Embodiment. Thereby, the output torque of the synchronous motor 1 can be improved.

(Fourth embodiment)
In the fourth embodiment, an electric compressor 110 to which the rotor 40 and the armature 50 of the above embodiment are applied will be described.

  9 and 10 show the configuration of the electric compressor 110 of the present embodiment.

  The electric compressor 110 of the present embodiment constitutes a well-known refrigeration cycle apparatus that circulates refrigerant together with a cooler, a decompressor, and an evaporator. The electric compressor 110 includes a compressor unit 120 and an inverter device 130.

  As shown in FIGS. 9 and 10, the compressor unit 120 includes a housing 140, an inner rotor 150, a connection plate 160, a side plate 170, and a shaft 180 together with the rotor 40 and the armature 50.

  The housing 140 is formed in a cylindrical shape. One side in the axial direction of the housing 140 is closed by the bottom 141. An opening 142 is formed on the other side of the housing 140 in the axial direction. One side of the housing 140 in the axial direction is provided with a refrigerant discharge hole 143 for discharging the refrigerant. The housing 140 accommodates the rotor 40, the armature 50, the inner rotor 150, the connecting plate 160, the side plate 170, and the shaft 180.

  The rotor 40 of this embodiment is configured in the same manner as the rotor 40 of the first embodiment. For this reason, the caulking portion 84 and the support bar 63 are provided for each permanent magnet 70 in the rotor 40. The axis of the rotor 40 coincides with the axis S <b> 1 of the housing 140. 9 and 10, the caulking portion 84 and the support bar 63 are not shown.

  The armature 50 is configured in the same manner as the armature 50 of the first embodiment, and is arranged on the outer side in the radial direction with the axis S1 as the center with respect to the rotor 40. The armature 50 is supported on the inner peripheral surface of the housing 140.

  The inner rotor 150 is disposed radially inward with respect to the rotor 40 with the axis S1 as the center o, and together with the inner peripheral surface 41 of the rotor 40 and the connecting plate 160, constitutes a compression mechanism that compresses the refrigerant. Machine. The inner rotor 150 is formed in a cylindrical shape, and is arranged such that its axis S4 is parallel to the axis S1 of the housing 10. The axis S4 of the inner rotor 150 is offset with respect to the axis S1 of the housing 10 (or the shaft 180). The inner rotor 150 forms a compression chamber V that sucks, compresses, and discharges the refrigerant with the inner peripheral surface 41 of the rotor 40.

  The connection plate 160 is a plate that connects the inner rotor 150 and the rotor 40. The dimension of the connecting plate 160 in the direction of the axis S1 is the same as the dimension of the inner rotor 150 in the direction of the axis S1. An end portion on the outer side in the radial direction of the coupling plate 160 constitutes a hinge portion 161 that is swingably supported with respect to the inner peripheral surface of the rotor 40.

  The hinge portion 161 is disposed radially inward with respect to one permanent magnet 70 </ b> A among the eight permanent magnets 70. The hinge portion 161 is disposed in a portion of the laminated core 60 where the magnetic flux density is sparse. That is, the hinge part 161, the caulking part 84, and the support bar 63 are arranged at a position shifted from the center line S2 of the permanent magnet 70B by an electrical angle θ (zero (deg) <θ <90 (deg)) in the rotational direction. ing.

  For convenience of explanation, among the eight permanent magnets 70, the permanent magnets 70 arranged radially outward with respect to the hinge portion 161 are the permanent magnets 70A, but the eight permanent magnets 70 are the same. .

  The inner rotor 150 is provided with a recess 152 that is recessed radially inward from the outer peripheral surface 151 about the axis S4. The recess 152 is formed so that the connecting plate 160 can move in the radial direction. The inner rotor 150 is formed with a suction hole 153 penetrating in a radial direction centered on the axis S4. The inner rotor 150 is rotatably supported with respect to the housing 140 via the shaft 180.

  The shaft 180 is fixed to the housing 140. The shaft 180 is disposed such that its axis is offset with respect to the axis of the rotor 40 (or the housing 140). The shaft 180 is disposed on the inner side in the radial direction centering on the axis of the inner rotor 150. The shaft 180 supports the inner rotor 150 rotatably. Thereby, the axis S4 of the inner rotor 150 is offset with respect to the axis of the rotor 40 (or the housing 140).

  The shaft 180 is provided with a coolant channel 181 (see FIG. 9). The coolant channel 181 is formed so as to extend in the axial direction of the shaft 180. The refrigerant flow path 181 is formed so as to communicate with the suction hole 153 of the inner rotor 150. The side plate 170 is formed so as to close the compression chamber V from one side and the other side of the axis S1.

  The side plate 170 is supported by the inner rotor 150. As a result, the side plate 170 is rotatably supported with respect to the housing 140 via the inner rotor 150. The side plate 170 is provided with refrigerant discharge holes 171a and 171b through which the refrigerant discharged from the compression chamber V flows out. Discharge valves 172a and 172b are provided in the refrigerant discharge holes 171a and 171b.

  The inverter device 130 controls the rotation of the rotor 40 by outputting a three-phase alternating current to the armature coil 52 of the armature 50.

  The inverter device 130 includes an inverter case 200, a lid portion 201, a circuit board 202, a semiconductor element 203, a cooling fin 204, a capacitor 205, and an airtight terminal 206.

  The inverter case 200 constitutes a housing together with the lid portion 201, and is formed in a short cylindrical shape having an opening on the other side of the axis S1. The inverter case 200 is provided with a refrigerant inlet 144. The refrigerant inlet 144 is formed on the outer side in the radial direction with the axis S <b> 1 as the center with respect to the cooling fin 204. The lid 201 is disposed so as to close the opening of the inverter case 200. The circuit board 202 is supported by the inverter case 200 in the housing. The semiconductor element 203, together with the capacitor 205, constitutes an inverter circuit that outputs a three-phase alternating current to the armature coil 52 of the armature 50. The semiconductor element 203 is disposed on one side of the circuit board 202 in the direction of the axis S1.

  The cooling fin 204 is disposed on one side of the semiconductor element 203 in the direction of the axis S1. The cooling fins 204 are disposed in the recesses 210 of the inverter case 200. The cooling fins 204 promote heat dissipation from the semiconductor element 203 to the refrigerant. A refrigerant passage 210b that penetrates in the direction of the axis S1 is formed at the bottom 210a of the recess 210 of the inverter case 200. The refrigerant channel 210b communicates with the refrigerant channel 181 of the shaft 180.

  The capacitor 205 is accommodated in the recess 211 of the inverter case 200. The terminal of the capacitor 205 is electrically connected to the circuit board 202. The airtight terminal 206 is disposed in the through hole 212 of the inverter case 200 and connects between the armature coil 52 of the armature 50 and the inverter circuit.

  Next, the operation of the electric compressor 110 of this embodiment will be described.

  First, when the inverter circuit outputs a three-phase alternating current to the 24 armature coils 52, the 24 armature coils 52 generate a rotating magnetic field toward the rotor 40 based on the three-phase alternating current. Then, the rotor 40 rotates in synchronization with the rotating magnetic field generated from the 24 armature coils 52.

  At this time, the rotational force of the rotor 40 is transmitted to the inner rotor 150 through the connection plate 160. For this reason, the inner rotor 150 rotates with respect to the shaft 180. At this time, the connecting plate 160 swings with respect to the inner peripheral surface of the rotor 40 while moving in the recess 152 of the inner rotor 150. Accordingly, the inner rotor 150 and the connecting plate 160 perform a compression operation for compressing the refrigerant in the compression chamber V.

  Details of the compression operation will be described below with reference to FIG. FIG. 11 shows the change of the compression chamber V accompanying the rotation of the rotor 40. The compression chamber V shown in FIG. 11 schematically shows the compression chamber V in the same cross section as FIG. is there.

  In FIG. 11, in order to clarify the operation mode of the compressor 1, the compression chamber V is rotated while the rotor 40 rotates twice, that is, while the rotation angle θ of the rotor 40 changes from 0 ° to 720 °. Shows changes. Furthermore, in FIG. 11, the rotation directions of the rotor 40 and the inner rotor 150 are indicated by thick solid arrows.

  First, when the rotation angle θ is 0 °, the contact point C3 and the hinge portion 161 side of the connecting plate 160 coincide with each other, and almost the entire area of the connecting plate 160 is accommodated in the recess 152 of the inner rotor 150. It becomes a state. Further, at the rotation angle θ = 0 °, the state immediately before the communication between the suction hole 153 and the compression chamber V is cut off, and the volume of the compression chamber V indicated by point hatching is the maximum volume.

  When the rotation angle θ increases, the hinge portion 161 of the connection plate 160 moves away from the contact point C3, and the inner rotor 150 rotates together with the connection plate 160. As a result, communication between the suction hole 153 and the compression chamber V indicated by point hatching is blocked.

  Furthermore, as shown in FIG. 11, as the rotation angle θ increases from 90 ° → 180 ° → 270 °, the volume of the compression chamber V indicated by the point hatching is reduced. As a result, the refrigerant pressure in the compression chamber V rises, and when the refrigerant pressure in the compression chamber V exceeds the valve opening pressure of the discharge valves 172a and 172b determined according to the refrigerant pressure in the internal space of the housing 140, the discharge is performed. The valves 172 a and 172 b are opened, and the refrigerant in the compression chamber V flows out to the internal space of the housing 140. The high-pressure refrigerant that has flowed into the internal space of the housing 140 is discharged from the refrigerant discharge hole 143 of the housing 140.

  When the rotation angle θ reaches 360 °, the volume of the compression chamber V that has been in the compression process becomes 0, and the state is the same as when the rotation angle θ is 0 °. Subsequently, as the rotation angle θ increases from 360 °, the volume of the compression chamber V indicated by point hatching communicating with the suction hole 153 increases. Further, as the rotation angle θ increases in the order of 450 ° → 540 ° → 630 °, the volume of the compression chamber V indicated by point hatching gradually increases. As a result, the low-pressure refrigerant from the evaporator side is point-hatched through the refrigerant suction port 144 of the housing 140 → the vicinity of the cooling fin 204 → the refrigerant flow path 210b of the inverter case 200 → the suction hole 153 of the inner rotor 150 → the refrigerant flow path 181 of the shaft 180. When the rotation angle θ reaches 720 °, the compression chamber V that has been in the suction process has a maximum volume.

  Here, the cooling fins 204 are cooled by the low-pressure refrigerant flowing from the refrigerant inlet 144 of the housing 140. For this reason, the semiconductor element 203 is cooled by the low-pressure refrigerant through the cooling fins 204.

  In FIG. 11, the change in the compression chamber V while the rotation angle θ changes from 0 ° to 720 ° has been described in order to clearly explain the operation mode of the compressor 1 of the present embodiment. Is the refrigerant compression process explained when the rotation angle θ changes from 0 ° to 360 ° and the refrigerant suction process explained when the rotation angle θ changes from 360 ° to 720 °. At the same time. As described above, in the electric compressor 110 of the present embodiment, the refrigerant can be sucked, compressed, and discharged in the refrigeration cycle.

  In the present embodiment described above, the hinge portion 161 is arranged at a position shifted from the center line S2 of the permanent magnet 70B by the electrical angle θ in the rotational direction. For this reason, the hinge part 161 is arrange | positioned in the site | part from which the magnetic flux density becomes sparse among the laminated cores 60. For this reason, it can suppress that the flow of magnetic flux is inhibited by the hinge part 161. FIG. Thereby, the output torque of a synchronous motor can be improved.

  In the present embodiment, the hinge portion 161 is disposed in a portion of the laminated core 60 where the magnetic flux density is the least sparse. Therefore, the obstruction of the flow of magnetic flux by the hinge part 161 can be reliably suppressed.

  In the present embodiment, one connection plate 160 is provided. For this reason, the number of connection plates 160 is a divisor of the number of magnetic poles (that is, permanent magnets 70). However, the number of connection plates 160 is not limited to one, and it is also conceivable that a compression mechanism is configured by the plurality of connection plates 160, the inner rotor 150, and the rotor 40.

  Here, the portion of the laminated core 60 where the magnetic flux density is the least sparse is formed on the inner side in the radial direction with respect to the permanent magnet 70 for each permanent magnet 70. For this reason, in order to suppress the inhibition of the flow of magnetic flux by the hinge portion 161, it is necessary to dispose the hinge portion 161 radially inward with respect to the permanent magnet 70 as shown in FIG. For this reason, the number of connecting plates 160 needs to be a divisor of the number of magnetic poles (that is, permanent magnets 70).

(Other embodiments)
In the first to third embodiments, the example in which the armature 50 is arranged on the outer side in the radial direction with the axis S1 as the center o with respect to the rotor 40 has been described. Thus, the armature 50 may be disposed radially inward with the axis S1 as the center o.

  In the first to third embodiments, the example in which the armature 50 having the distributed winding structure is used as the armature 50 has been described. However, instead of this, the armature 50 has an armature having the concentrated winding structure. It may be used. In this case, there are several combinations of the number of poles and the number of armature coils 52. For example, when the number of poles is eight, the number of armature coils 52 per phase may be four. It is common.

  In the first to third embodiments, the example in which the three-phase AC motor is used as the synchronous motor 1 has been described. However, an N (≠ 3) phase AC motor may be used as the synchronous motor 1.

  In the first to third embodiments, the example in which the number of the permanent magnets 70 and the support bar 63 is eight and the number of the armature coils 52 per phase is eight has been described. However, the number of permanent magnets 70 and the support bar 63 may be set to a number other than eight, and the number of armature coils 52 per phase may be set to a number other than eight.

  In the first to third embodiments, the example in which the rotor core composed of the plurality of annular core plates 61, the end plates 62a and 62b, and the plurality of support rods 63 is the laminated core 60 has been described. Not limited to this, a member integrally formed in a cylindrical shape may be used as the rotor core without using the plurality of annular core plates 61.

  In the first to fourth embodiments described above, the rotor 40 has been described as an example in which a plurality of permanent magnets 70 are embedded in the laminated core 60. Instead, the rotor 40 is replaced with a laminated core. A structure may be adopted in which a plurality of permanent magnets 70 are arranged in the circumferential direction on the outer peripheral side of 60.

  In the second embodiment, in order to connect the laminated core 60 and the shaft 20, the example in which the concave portion 91 is provided as the fitting portion in the laminated core 60 and the convex portion 101 is provided in the shaft 20 has been described. Thus, the laminated core 60 may be provided with a convex portion as a fitting portion, and the shaft 20 may be provided with a concave portion to connect the laminated core 60 and the shaft 20.

  In the third embodiment, the example in which the pair of permanent magnets 70a and 70b are arranged in a square shape has been described. However, the present invention is not limited thereto, and the pair of permanent magnets 70a and 70b has the axis S1 as the center o. Any arrangement may be used as long as it is arranged symmetrically about the center line S2 extending in the radial direction.

  In the fourth embodiment, an example in which the hinge portion 161, the caulking portion 84, and the support bar 63 of the connecting plate 160 are disposed radially inward of one permanent magnet 70B among the eight permanent magnets 70 will be described. However, instead of this, the following may be used.

  That is, the hinge part 161 and the caulking part 84 among the hinge part 161, the caulking part 84, and the support bar 63 of the connecting plate 160 are disposed on the radially inner side with respect to the permanent magnet 70 </ b> B, and the support bar 63 is excluded. May be.

  Although the said 4th Embodiment demonstrated the example which provided one connection plate 160, it may replace with this and may provide two or more connection plates 160. FIG. In this case, the number of connecting plates 160 is a divisor of the number of magnetic poles.

  In the first to fourth embodiments described above, the example in which the support bar 63 is disposed in the portion of the laminated core 60 where the magnetic flux density is the least sparse is described, but instead of this, the magnetic flux density of the laminated core 60. The caulking portion 84 may be arranged at a site where is most sparse.

  In addition, this invention is not limited to above-described embodiment, In the range described in the claim, it can change suitably. Further, the above embodiments are not irrelevant to each other, and can be combined as appropriate unless the combination is clearly impossible. In each of the above-described embodiments, it is needless to say that elements constituting the embodiment are not necessarily essential unless explicitly stated as essential and clearly considered essential in principle. Yes.

DESCRIPTION OF SYMBOLS 1 Synchronous motor 10 Housing 20 Shaft 40 Rotor 50 Armature 60 Laminated core (rotor core)
61 Annular core plate 63 Support bar 70 Permanent magnet 84 Caulking section 110 Electric compressor

Claims (15)

A plurality of annular core plates (61) formed in an annular shape centering on the axis line and a laminated core (60) formed by laminating them in the axial direction and arranged in a circumferential direction centering on the axis line, A rotor (40) having a plurality of magnets (81) forming magnetic poles in a radial direction about the axis;
And an armature (50) that is arranged in a radial direction about the axis with respect to the rotor and generates a rotating magnetic field, and is applied to a synchronous motor in which the rotor rotates in synchronization with the rotating magnetic field. A laminated core,
A connecting portion (63, 84) for connecting the plurality of annular core plates;
In the state where the magnetic flux generated by the armature and the magnetic flux generated by the plurality of magnets are overlapped with each other so that the armature generates the rotating magnetic field, the coupling core is connected to a portion where the magnetic flux density is sparse. A laminated core characterized in that the portion is arranged.   The imaginary line connecting the circumferential central portion of any one of the plurality of magnets and the center of the annular core plate is the center line (S2) of any one of the magnets, and θ is 0 deg <θ. When the electrical angle of the synchronous motor satisfying <90 deg is used, the connecting portion is disposed at a position shifted by the θ in the rotation direction of the rotor from the center line of any one of the magnets. The laminated core according to claim 1, which is characterized by: A plurality of the connecting portions for connecting the plurality of annular core plates are provided;
Of the plurality of connecting portions, the connecting portion having the largest cross-sectional area orthogonal to the direction of the axis is located at a position shifted by θ in the rotational direction from the center line of any one of the plurality of magnets. The laminated core according to claim 2, wherein the laminated core is arranged.   4. The laminated core according to claim 2, wherein the connecting portion is disposed for each of the magnets at a position shifted by θ in the rotation direction of the rotor from the center line. 5. Each of the plurality of annular core plates is formed with a plurality of first through holes (80) penetrating in the stacking direction,
The plurality of first through holes are arranged at equal intervals in the circumferential direction for each of the annular core plates,
The plurality of first through holes for each annular core plate communicate with each other to form a plurality of first communication holes (81) arranged at the same interval in the circumferential direction,
5. The laminated core according to claim 1, wherein the plurality of magnets are respectively disposed in the plurality of first communication holes. 6. Each of the plurality of annular core plates is formed with a second through hole (82) penetrating in the stacking direction,
The second through holes for each annular core plate communicate with each other to form a second communication hole (83);
6. The second communication hole, wherein a member (63) formed so as to extend in the stacking direction and supporting the plurality of annular core plates is disposed as the connection portion. A laminated core according to any one of the above.   The laminated core according to any one of claims 1 to 5, wherein a caulking portion (84) for connecting the plurality of annular core plates by caulking is arranged as the connecting portion. A synchronous motor comprising the laminated core according to any one of claims 1 to 7,
A structure (20) disposed radially inward with the axis as the center with respect to the laminated core,
The laminated core includes a fitting portion (91) for connecting to the structure by fitting,
The synchronous motor according to claim 1, wherein the fitting portion is disposed in a portion of the laminated core where the magnetic flux density is sparse. On the radially inner side of the laminated core, a concave portion (91) that is recessed radially outward with the axis as the center is provided as the fitting portion,
The structure is provided with a convex portion (101) protruding outward in the radial direction with respect to the laminated core side,
The synchronous motor according to claim 8, wherein the laminated core is connected to the structural body by fitting the convex portion into the concave portion. A rotor core (60) formed in a cylindrical shape and a plurality of magnetic poles arranged in a circumferential direction centered on the axis of the rotor core and each forming a magnetic pole in a radial direction centered on the axis A rotor (40) having a magnet (81), and an armature (50) disposed in a radial direction about the axis with respect to the rotor and generating a rotating magnetic field toward the rotor. A synchronous motor in which the rotor rotates in synchronization with the rotating magnetic field,
A structure (20) disposed radially inward with respect to the rotor core with respect to the rotor core;
The rotor core includes a fitting portion (91) for connecting to the structure by fitting.
The synchronous motor according to claim 1, wherein the fitting portion is disposed in a portion of the laminated core where the magnetic flux density is sparse. On the radially inner side of the rotor core, a concave portion (91) that is recessed radially outward with the axis as a center is provided as the fitting portion,
The structure is provided with a convex portion (101) protruding outward in the radial direction with respect to the laminated core side,
The synchronous motor according to claim 10, wherein the laminated core is connected to the structural body by fitting the convex portion into the concave portion. An electric compressor comprising the laminated core according to any one of claims 1 to 7,
A compressor (150) that is disposed radially inward with respect to the laminated core and compresses the refrigerant;
The compressor is connected to the laminated core by a support member (161),
The rotational force of the laminated core is transmitted to the compressor through the support member, and the compressor compresses the refrigerant,
The supported portion (161) supported by the laminated core of the supporting member is a portion of the laminated core where the magnetic flux density is sparse. A rotor core (60) formed in a cylindrical shape and a plurality of magnetic poles arranged in a circumferential direction centered on the axis of the rotor core and each forming a magnetic pole in a radial direction centered on the axis A rotor (40) having a magnet (81), and an armature (50) disposed in a radial direction about the axis with respect to the rotor and generating a rotating magnetic field toward the rotor. A synchronous motor (1A) in which the rotor rotates in synchronization with the rotating magnetic field;
An inner peripheral surface of the rotor core, which is disposed on the inner side in the radial direction with the axis as a center with respect to the rotor core and is rotated by a rotational force transmitted from the rotor core through a connecting member (160). An electric compressor comprising a compressor (150) for compressing refrigerant between
The supported member is supported by the rotor core among the connecting members in a state in which the magnetic flux generated by the armature and the magnetic flux generated by the plurality of magnets are overlapped in order for the armature to generate the rotating magnetic field. An electric compressor characterized in that the portion (161) is disposed in a portion of the laminated core where the magnetic flux density is sparse.   The imaginary line connecting the circumferential central portion of any one of the plurality of magnets and the center of the annular core plate is the center line (S2) of any one of the magnets, and θ is 0 deg <θ. When the electrical angle of the synchronous motor satisfying <90 deg is used, the connecting portion is disposed at a position shifted by the θ in the rotation direction of the rotor from the center line of any one of the magnets. The electric compressor according to claim 13.   The electric compressor according to claim 13 or 14, wherein the number of the support members is a divisor of the number of the magnetic poles.

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