JP2010093910A - Permanent magnet type rotating electric machine and compressor using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low-vibration and low-noise permanent magnet type rotating electric machine, and a compressor using the same. <P>SOLUTION: The permanent magnet type rotating electric machine includes a stator in which an armature winding is concentrically wound to teeth of a stator core, and a rotor in which a permanent magnet is arranged at a rotor core. The rotor core formed by laminating rotor core plates has a d-axis and a q-axis which are axes of the magnetic flux of the permanent magnet. A plurality of gap faces are formed at an outer peripheral face of the rotor core which faces the inner periphery of the stator. The gap faces have gap spacings on the q-axis side larger than gap spacings on the d-axis side. The rotor core is constituted by overlapping a laminate group (1) of the rotor core plates in which an equivalent gap spacing obtained by averaging the plurality of gap faces is made larger on the clockwise direction side around the d-axis, and a laminate group (2) in which the equivalent gap on the counterclockwise direction side is larger, in the direction of an axial line of a rotating shaft of the rotor. When the rotor rotates in counterclockwise rotation, the lamination thickness rate of the laminate group (1) is larger than the laminate group (2). <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a permanent magnet type rotating electrical machine having a permanent magnet for a field in a rotor, and more particularly to a permanent magnet type rotating electrical machine used in a compressor such as an air conditioner, a refrigerator, a freezer, or a showcase.

  Conventionally, in this type of permanent magnet type rotating electric machine, concentrated winding is used for the stator winding and rare earth neodymium permanent magnet is used for the field magnet, thereby achieving high efficiency. In addition, along with the increase in magnetic flux density of magnet materials, vibration and noise components have become apparent, and various countermeasures have been taken.

  For example, in the permanent magnet type rotating electrical machine described in Japanese Patent Application Laid-Open No. 2008-29095 (Patent Document 1), a plurality of slits extending from the outer peripheral side of the permanent magnet embedded in the rotor to the outer peripheral side of the rotor are provided. A method has been proposed in which a plurality of gap surfaces are provided on the outer periphery of the rotor, and the gap surfaces are shifted in stages in the axial direction.

JP 2008-29095 A

  The use of concentrated winding stators and high residual flux density magnets have dramatically improved the efficiency of permanent magnet synchronous motors. On the other hand, in the concentrated winding stator, in contrast to the distributed winding stator, the harmonic magnetic flux increases in principle, and the harmonic magnetic flux is promoted by a permanent magnet having a high magnetic flux density. In other words, the vibration and noise of the motor itself are increasing, and there is a problem that the middle frequency band that is most disturbing when incorporated in a compressor becomes apparent.

  On the other hand, in Patent Document 1, a plurality of slits extending from the outer peripheral side of the permanent magnet embedded in the rotor to the rotor outer peripheral side are provided, and a plurality of gap surfaces are provided on the outer periphery of the rotor. The so-called skew structure in which is shifted in a stepwise manner in the axial direction reduces the harmonic magnetic flux on the gap surface. As a result, the induced electromotive force waveform can be converted into a sine wave to make the armature current into a sine wave, pulsation torque caused by the interaction between the induced electromotive force and the armature current can be reduced, and the magnetic flux can be changed in the axial direction Thus, the harmonic magnetic flux in the gap portion is reduced, and the components due to vibration and noise are reduced.

However, in the above-described prior art, for example, in the method of Patent Document 1, although noise generated in a relatively low frequency band and a relatively high frequency band can be reduced, noise in a middle frequency band in question can be reduced. On the other hand, it could not be said that it was sufficiently reduced.
In the case of Patent Document 1, although the harmonic component is reduced as the magnetic flux generated by the rotor, the harmonic component of the in-machine magnetic flux combined with the magnetic flux generated by the stator is actually sufficiently reduced. It was because there was not.

  Therefore, in order to sufficiently reduce the harmonic components in the in-machine magnetic flux, it is important to consider the armature reaction, and there is an optimum value for the thickness ratio of each cross section of the rotor core. It was.

  An object of the present invention is to provide a low-vibration and low-noise permanent magnet type rotating electric machine and a compressor using the same without reducing performance such as motor efficiency.

  In order to achieve the above object, according to the present invention, a stator in which concentrated armature windings are provided so as to surround teeth in a plurality of slots formed in the stator core, and a plurality of rotor cores. In the permanent magnet type rotating electrical machine, the permanent magnet is disposed in the permanent magnet insertion hole, and has a rotor that faces the inner periphery of the stator via a gap and is rotatably supported by a rotating shaft. The iron core includes stacked rotor core plates, a d-axis that is a magnetic flux axis of the permanent magnet, and a q-axis that is 90 degrees apart from the d-axis by an electrical angle, and the permanent magnet insertion hole is the rotor An interval length between the stator core and the outer circumferential surface of the rotor core that faces the inner circumference of the stator so as to gather the magnetic flux of the permanent magnets straight through the rotor core plate in the stacking direction of the iron core plates. A plurality of different gap surfaces are provided, The gap surface is larger in gap length on the q-axis side than the gap interval length on the d-axis side, and the equivalent gap interval length obtained by leveling the plurality of gap surfaces is in the clockwise direction with the d-axis as the center line. Laminating group (1) of large rotor core plates and laminating group (2) of rotor core having a large counterclockwise direction are stacked in the axial direction of the rotating shaft to constitute the rotor core, Provided is a permanent magnet type rotating electrical machine characterized in that the lamination ratio of the laminated group (1) and the laminated group (2) is different.

  Further, in the present invention, a stator in which concentrated armature windings are provided so as to surround teeth in a plurality of slots formed in the stator core, and a plurality of permanent magnet insertion holes in the rotor core. In a permanent magnet type rotating electrical machine having a permanent magnet disposed and facing the inner periphery of the stator through a gap and rotatably supported by a rotating shaft, the rotor core plate is formed by stacking The rotor core has a d-axis that is a magnetic flux axis of the permanent magnet and a q-axis that is separated from the d-axis by an electrical angle of 90 degrees, and the permanent magnet insertion hole is in the stacking direction of the rotor core plate A plurality of different lengths between the stator core and the outer peripheral surface of the rotor core facing the inner periphery of the stator so as to pass through the rotor core plate straight and collect the magnetic flux of the permanent magnet. Gap surfaces are provided, and the plurality of gap surfaces are d Lamination of rotor core plates in which the gap interval length on the q-axis side is larger than the gap interval length on the side, and the equivalent gap interval length obtained by leveling the plurality of gap surfaces is larger in the clockwise direction with the d axis as the center line The rotor core is configured by superimposing a group (1) and a laminated group (2) of rotor cores having a larger counterclockwise direction in the axial direction of the rotation shaft, and the rotation direction of the rotor is reversed. Provided is a permanent magnet type rotating electrical machine characterized in that, when clockwise, the stacking ratio of the laminated group (1) is larger than that of the laminated group (2).

  As described above, according to the present invention, there is provided a permanent magnet type rotating electrical machine that can further reduce the harmonic component of the in-machine magnetic flux, reduce the harmonic component in the middle frequency band, and further improve the audibility. Can be provided.

  Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS.

  In each figure, the common code | symbol shows the same thing. Also, here, a 4-pole permanent magnet type rotating electric machine is shown, and the ratio of the number of poles of the rotor to the number of slots of the stator is set to 2: 3, but the ratios of other poles and slots are almost the same. The effect of can be obtained.

  FIG. 1 is a cross-sectional view of a first embodiment of a permanent magnet type rotating electrical machine according to the present invention, and FIGS. 2 and 3 are cross-sectional views showing the rotor core shape of the first embodiment of the permanent magnet type rotating electrical machine according to the present invention. . FIG. 4 shows a rotor core shape of the first embodiment of the permanent magnet type rotating electrical machine according to the present invention. FIG. 5 shows the radial electromagnetic excitation force of the first embodiment of the permanent magnet type rotating electric machine according to the present invention, FIG. 8 shows the sectional structure of the compressor according to the present invention, and Table 1 shows various rotor structures. The results of the audibility test of the compressor are shown.

図１において、永久磁石式回転電機１は固定子２と回転子３から構成される。固定子２はティース４とコアバック５からなる固定子鉄心６と、ティース４間のスロット７内にはティース４を取り囲むように巻装された集中巻の電機子巻線８（三相巻線のＵ相巻線８ａ、Ｖ相巻線８ｂ、Ｗ相巻線８ｃからなる）から構成される。ここで、永久磁石式回転電機１は４極６スロットであるから、スロットピッチは電気角で１２０度である。

In FIG. 1, a permanent magnet type rotating electrical machine 1 includes a stator 2 and a rotor 3. The stator 2 includes a stator core 6 including a tooth 4 and a core back 5, and concentrated armature windings 8 (three-phase windings) wound around the teeth 4 in slots 7 between the teeth 4. Of U-phase winding 8a, V-phase winding 8b, and W-phase winding 8c). Here, since the permanent magnet type rotating electrical machine 1 has 4 poles and 6 slots, the slot pitch is 120 degrees in electrical angle.

  In FIG. 2, the rotor 3 has a single-letter shape (linear shape) permanent magnet insertion hole 13 in the vicinity of the outer peripheral surface of the rotor core 12 in which the shaft hole 15 is formed, and a rare earth neodymium permanent in the permanent magnet insertion hole 13. The magnet 14 is fixed. The magnetic flux axis of the permanent magnet 14 is the d axis, and the axis located between the magnetic poles separated from the d axis by an electrical angle of 90 ° is the q axis. Here, the recess 11 is provided on the q-axis between the magnetic poles of the adjacent permanent magnets 14. Further, the outer peripheral shape of the rotor core 12 has a plurality of gap surfaces such as g1 and g2.

  As shown in FIG. 2, the permanent magnet 14 formed in a single character shape (linear shape) is disposed in a direction perpendicular to a radial line passing through the axis of the rotor 3. In this case, the radial line and the d-axis, which is the magnetic flux axis of the permanent magnet 14, overlap each other.

  The g1 of the gap surface refers to the gap interval length between the inner peripheral surface of the stator core 6 and the outer peripheral surface of the rotor 3 facing each other. The gap surface g2 refers to the gap interval length between the outer peripheral surface of the gap g1 and the outer peripheral surface smaller in diameter than the outer peripheral surface of the gap g1.

The outer peripheral surface of the gap g <b> 1 is a large outer peripheral surface of the rotor 3. The outer peripheral surface of the gap g2 is an outer peripheral surface having a small diameter of the rotor 3. The gap interval length between the large outer peripheral surface and the stator core 6 is
Small g1. The gap gap length between the small-diameter outer peripheral surface and the stator core 6 is large (g1 + g2).

  The outer peripheral shape of the rotor 3 has a large outer peripheral surface, a small outer peripheral surface, and a step (step) formed between both outer peripheral surfaces.

  When the gap interval length is described in relation to the d-axis and the q-axis, the gap interval length is smaller on the d-axis side, and the gap interval length is larger on the q-axis side. Here, two gap interval lengths are mentioned, but they can be further increased. A plurality of gap interval lengths are averaged and referred to as an equivalent gap interval length.

2 (a), 2 (b), and 4, the rotor core 12 has a cross section A shown in FIG. 2 (a) and a cross section B shown in FIG. 2 (b) in the circumferential direction as shown in FIG. They are stacked so as to form a V-shape in a staircase pattern. As shown in FIG. 4, when the rotation direction of the rotor is counterclockwise, the cross section A is provided with the gap surface g2 on the right side (clockwise direction) about the d axis, while the cross section B has the gap surface g2 the provided on the left side (counterclockwise direction) about the d-axis, when the lamination thickness of the cross section a and L _a, the laminated thickness of the cross section B and L _B, are arranged such that the relation of L B _{<L a} ing.

  Further description will be made with reference to FIGS.

  The rotor core 12 shown in FIGS. 2 (a), 2 (b), and 4 is formed by laminating two rotor core plates (two stacked groups) having different circumferential lengths of the gap surface g2.

  In the stator core plate shown in FIG. 2A, the circumferential length of the gap face g2 (gap gap length is large) existing on the right side (clockwise direction side) around the d axis is long. The circumferential length of the gap surface g2 (large gap interval length) existing on the left side (counterclockwise direction side) from the center is short. The rotor core plate shown in FIG. 2A is defined as a laminated group (1).

  The rotor core plate shown in FIG. 2 (b) is the opposite, and the circumferential length of the gap surface g2 (gap gap length is large) existing on the left side (counterclockwise direction side) around the d axis. And the circumferential length of the gap surface g2 (large gap interval length) existing on the right side (clockwise direction side) around the d-axis is short. The rotor core plate shown in FIG. 2B is a laminated group (2).

  Here, the rotor core plates of the two laminated groups (1) and (2) will be described from the viewpoint of the equivalent gap interval length.

  In the stacked group (1), the equivalent gap interval length is larger on the right side (clockwise direction side) than the left side (counterclockwise direction side) with respect to the d axis. On the contrary, in the laminated group (2), the equivalent gap interval length is smaller on the right side (clockwise direction side) around the d axis than on the left side (counterclockwise direction side). That is, in the stacked groups (1) and (2), the relationship between the left and right equivalent gap interval lengths about the d axis is reversed.

  The difference in the equivalent gap interval length on the left / right side with respect to the d-axis is related to the difference in the circumferential length of the gap surface g2 on the left / right side.

  FIG. 4 shows the divided block (A) of the laminated group (1) in which the rotor core plates of the laminated group (1) are laminated and the divided block of the laminated group (2) in which the rotor core plates of the laminated group (2) are laminated. The rotor core 12 formed by overlapping (B) in the axial direction of the rotor is shown.

  The divided blocks (A) of one stacked group (1) and the divided blocks (B) of two stacked groups (2) are alternately overlapped, but the number and combination of the divided blocks can be appropriately selected. is there.

  Here, in the cross section A shown in FIG. 2A, θ1 and θ2 satisfy θ1> θ2 around the d-axis at the portion where the gap surface g1 is formed, and the sum of θ1 and θ2 is an electrical angle of 90 °. It is comprised so that it may become -120 degrees. Also, in the cross section B shown in FIG. 2B, the relationship between θ1 and θ2 is θ1 <θ2 with the d axis as the center.

  The range of the sum of θ1 and θ2 shown in FIGS. 2 (a) and 2 (b) is a range of arcs in the rotation direction where the gap gap length is small (opening angle with the rotation axis as the center). It is. The opening angle that is the sum of θ1 and θ2 is stopped within the range of about 90 degrees to about 120 degrees in electrical angle, and the outside beyond the opening angle is where the gap interval length is small.

  2A, 2B, and 3, magnetic pole slits 10a to 10d are provided on the outer peripheral side of the permanent magnet 14 so as to sandwich the d axis. As shown in FIG. The inclinations are arranged so as to intersect at one point P on the d-axis.

  This will be further described with reference to FIGS.

  The magnetic pole slits 10a to 10d are provided between the outer periphery of the rotor core 12 and the permanent magnet insertion hole 13, are provided so as to penetrate the rotor core plate in the stacking direction, and extend in the outer peripheral direction of the rotor core 12. It is formed into an elongated shape.

  Further, as shown in FIG. 3, the plurality of magnetic pole slits 10a to 10d pass through the side surface or the inside of the magnetic pole slit along the longitudinal direction of the magnetic pole slit, and the extension line extending to the outer periphery of the rotor core 12 has the d. It is arranged to intersect in the vicinity including on the axis. These magnetic pole slits 10a to 10d are arranged so as to be symmetric with respect to the d axis as a center line.

  It has been found that the magnetic pole slits 10a to 10d can sine-wave the induced electromotive force waveform to make the armature current sine wave, and reduce the harmonic magnetic flux generated by the interaction between the induced electromotive force and the armature current. Therefore, also in this structure, the magnetic pole slits 10a to 10d are provided to suppress the armature reaction and reduce the harmonic component of the in-machine magnetic flux.

  The configuration ratio of the radial electromagnetic excitation force and the cross section A will be described with reference to FIG.

The rotor core 12 is laminated so that a cross section A shown in FIG. 2A and a cross section B shown in FIG. 2B form a V shape in a stepped manner in the circumferential direction as shown in FIG. When the rotation direction is counterclockwise, the thickness ratio of the cross section A in which the gap surface g2 is provided on the right side about the d-axis is 50% <L _A <85% (L relative to the total thickness of the rotor core 12). ₍ The thickness ratio of _A ), the radial electromagnetic excitation force of the first embodiment of the permanent magnet type rotating electrical machine according to the present invention is the thickness ratio of each cross section of the rotor core. The result is much smaller than the rotor structure with the same. Therefore, it can be said that there is an optimum value for the thickness ratio of each cross section of the rotor core.

  As shown in FIG. 8, in the cylindrical compression container 69, a spiral wrap 62 standing upright on the end plate 61 of the fixed scroll member 60, and a spiral wrap 65 standing upright on the end plate 64 of the orbiting scroll member 63, , And the orbiting scroll member 63 is rotated by the permanent magnet type rotating electrical machine 1 via the crankshaft 72 so that the compression operation is performed.

  Of the compression chambers 66 (66a, 66b,...) Formed by the fixed scroll member 60 and the orbiting scroll member 63, the compression chamber located on the outermost side is the scroll members 63 and 60 accompanying the orbiting motion. The volume gradually decreases. When the compression chambers 66 a and 66 b reach the vicinity of the centers of the scroll members 60 and 63, the compressed gas in both the compression chambers 66 is discharged from a discharge port 67 communicating with the compression chamber 66.

  The discharged compressed gas passes through a gas passage (not shown) provided in the fixed scroll member 60 and the frame 68 and reaches the compression container 69 below the frame 68, and a discharge pipe 70 provided on the side wall of the compression container 69. To the outside of the electric compressor.

  The permanent magnet type rotating electrical machine 1 that drives the electric compressor is controlled by a separate inverter (not shown) and rotates at a rotation speed suitable for the compression operation. Here, the permanent magnet type rotating electrical machine 1 includes a stator 2 and a rotor 3, and a crankshaft 72 provided on the rotor 3 has a crankshaft on the upper side. An oil hole 74 is formed in the crankshaft 72, and the lubricating oil in the oil reservoir 73 at the lower portion of the compression container 69 is supplied to the slide bearing 75 through the oil hole 74 by the rotation of the crankshaft 72.

  A permanent magnet type rotating electrical machine having various rotor shapes was incorporated into the compressor having such a configuration, and a noise audibility test was conducted. The actual measurement results are shown in Table 1.

  In Table 1, it was found that the frequency band of annoying noise is roughly divided into three regions, a low region, a mid region, and a high region, and particularly, the mid region component appears more prominently. Analyzing the relationship between the frequency band of these noises and various rotor structures, a rotor structure similar to Patent Document 1 (stacked section A shown in FIG. 2A and stacked section B shown in FIG. 2B). The structure with the same stacking thickness ratio) has a reduction effect on the low and high frequency noise components, but it has not been sufficiently reduced in the middle range, although there is some change in audibility.

  On the other hand, in the case of the structure of the present invention (the stacking ratio of the cross-section A and the cross-section B is different), the noise components in the low and high ranges have the same effect as that similar to that of Patent Document 1. In addition to the above, it was confirmed that the noise components in the middle range were greatly reduced.

  As a result, the cause of noise was analyzed, and it was found that the noise was generated by so-called electromagnetic excitation force generated by multiplication of the fundamental magnetic flux and the harmonic magnetic flux.

  Here, in the rotor structure similar to Patent Document 1, low-order harmonic fluxes such as the fifth and seventh orders and higher-order harmonic fluxes such as the 25th and 27th orders are large as the harmonic flux components. A reduction was observed. Further, in the case of the structure of the present invention, as in the rotor structure similar to Patent Document 1, the low and high order harmonic magnetic flux is reduced, and the 11th order component and the 13th, 15th, and 17th order components are relatively medium. It was found that the harmonic magnetic flux considered to constitute the electromagnetic excitation force in the region was greatly reduced.

  Therefore, as shown in FIG. 5, if the electromagnetic excitation force in the mid-range is relatively reduced, the harmonic component of the in-machine magnetic flux is further reduced, the harmonic component in the mid-frequency band is reduced, and the audibility is further improved. It was possible to confirm that this was possible by actual measurement.

  As mentioned above, if the above-mentioned permanent magnet type rotating electrical machine is applied to various compressors for air conditioning, a compressor with low vibration and low noise can be provided.

FIG. 6 is a diagram showing the rotor core shape of the second embodiment of the permanent magnet type rotating electric machine according to the present invention, and the same components as those in FIG. 4 are denoted by the same reference numerals. In the figure, the portions different from FIG. 4 are arranged so that the thickness ratio of the cross section A is 50% <L _A <85%, and the number of components laminated in the axial direction of the cross section A and the cross section B is as follows. Instead, it is configured in a W shape. Even if comprised in this way, the axial thrust force can be suppressed. Further, since the magnetic coupling in the axial direction between the cross sections A and B increases, the skew pitch can be arbitrarily adjusted while using the same cross sectional shape, for example, the apparent skew pitch can be reduced.

  7 (a) and 7 (b) are sectional views showing the rotor core shape of the third embodiment of the permanent magnet type rotating electric machine according to the present invention, and the same components as those in FIG. is there. In the figure, the part different from FIG. 2 is a V-shaped arrangement in which two permanent magnets 14 are provided per pole and the apex is directed to the axis of the rotating shaft fitted in the rotating shaft hole 15. Even if it arrange | positions in this way, the effect similar to FIG. 2 can be acquired.

  This will be further described with reference to FIGS. 7 (a) and 7 (b).

  As shown in FIGS. 7A and 7B, the rotor core 12 includes two permanent magnet insertion holes 13 and two permanent magnets 14 per pole. The two permanent magnets 14 and the permanent magnet insertion hole 13 are symmetrically arranged in a V shape with the d axis as the center line, and this V is placed so that the bottom at the apex is covered with blood on the d axis and the axis of the rotation axis. The mouth that opens toward the center and opens toward the center is directed toward the outer peripheral side of the rotor core 12.

  Moreover, the rotor core 12 has the recessed part 11 provided in an outer peripheral circular arc surface with a small diameter. The concave portion 11 is provided on the q axis, and the bottom that becomes the apex of the triangle is placed on the q axis and is directed to the axis of the rotation axis. The opening angle of the triangle has a size well over 90 degrees.

  Further, the magnetic pole slits 10 e to 10 h are provided between the outer periphery of the rotor core 12 and the permanent magnet insertion hole 13. The magnetic pole slits 10e to 10h provided in FIGS. 7 (a) and 7 (b) are provided in FIGS. 2 (a) and 2 (b) because the permanent magnet insertion holes 13 are arranged in a V shape. It is longer than the magnetic pole slits 10a to 10d.

  The recess 11 provided in FIGS. 2A and 2B is a triangle similar to the recess 11 provided in FIGS. 7A and 7B, but is a right triangle. The concave portion 11 is arranged with the apex of the right triangle facing the axis of the rotation axis. The permanent magnet 14 is placed so that the end portion faces one side of a right triangle. The permanent magnets 14 shown in FIGS. 7A and 7B are also placed in the same manner with respect to the triangular recess 11.

  2A, FIG. 2B, FIG. 7A, and FIG. 7B, the triangular concave portion 11 provided in the rotor core 12 has a q-axis of a small-diameter outer peripheral circular arc surface. It extends along the axis of the rotor. These triangular recesses 11 are different in shape as a triangle, but are common in a V-shaped cut shape in which the apex is directed to the axis of the rotor.

  Further, on the outer peripheral surface of the rotor core 12, the V-shaped recess 11 extends straight along the rotor axial direction. On the other hand, as shown in FIGS. 4 and 6, the step portion existing between the large outer circumferential arc surface and the large outer circumferential arc surface is divided into blocks (cross section B1, cross section A1, cross section B2, In the unit of the cross section A2, the cross section B3, etc., they are aligned linearly, but are shifted in the rotational direction between the respective divided blocks. This shift in the rotational direction is formed by alternately stacking the divided blocks (cross section A) of the laminated group (1) and the divided blocks (cross section B) of the laminated group (2).

Sectional drawing of the permanent-magnet-type rotary electric machine concerning embodiment of this invention. Sectional drawing which shows the rotor core shape of the permanent magnet type rotary electric machine concerning embodiment of this invention. The fragmentary sectional view which shows the rotor core shape of the permanent magnet type rotary electric machine concerning embodiment of this invention. The figure which shows the rotor core shape of the permanent-magnet-type rotary electric machine concerning embodiment of this invention. The figure which shows the radial direction electromagnetic excitation force of the permanent-magnet-type rotary electric machine concerning embodiment of this invention. The figure which shows the rotor core shape of the permanent magnet type rotary electric machine concerning other embodiment of this invention. Sectional drawing which shows the rotor core shape of the permanent magnet type rotary electric machine concerning other embodiment of this invention. The figure which shows the cross-section of the compressor carrying the permanent magnet type rotary electric machine concerning embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Permanent magnet type rotary electric machine (drive motor), 2 ... Stator, 3 ... Rotor, 4 ... Teeth, 5 ... Core back, 6 ... Stator core, 7 ... Slot, 8 ... Armature winding, 10a DESCRIPTION OF SYMBOLS 10d ... Magnetic pole slit, 10e-10h ... Magnetic pole slit, 11 ... Recessed part, 12 ... Rotor core, 13 ... Permanent magnet insertion hole, 14 ... Permanent magnet, 15 ... Shaft hole, 60 ... Fixed scroll member, 61 ... End plate , 62 ... spiral wrap, 63 ... orbiting scroll member, 64 ... end plate, 65 ... spiral wrap, 66 ... compression chamber, 67 ... discharge port, 68 ... frame, 69 ... compression container, 70 ... protruding pipe, 72 ... Crankshaft, 73 ... oil retaining part, 74 ... oil hole, 75 ... slide bearing.

Claims (18)

A permanent magnet is disposed in a plurality of permanent magnet insertion holes in the stator core, and a stator in which concentrated winding armature windings are provided so as to surround the teeth in a plurality of slots formed in the stator core, In the permanent magnet type rotating electrical machine having a rotor facing the inner circumference of the stator via a gap and rotatably supported by a rotating shaft,
The rotor core has stacked rotor core plates that are stacked, a d-axis that is a magnetic flux axis of the permanent magnet, and a q-axis that is separated from the d-axis by an electrical angle of 90 degrees,
The permanent magnet insertion hole passes straight through the rotor core plate in the stacking direction of the rotor core plate,
In order to collect the magnetic fluxes of the permanent magnets, a plurality of gap surfaces having different distances from the stator are provided on the outer peripheral surface of the rotor core facing the inner periphery of the stator, and the plurality of gap surfaces Is larger than the gap interval length on the d-axis side than the gap interval length on the q-axis side,
A laminated group (1) of rotor core plates having an equivalent gap interval length obtained by leveling the plurality of gap surfaces and having a large clockwise direction centered on the d-axis, and a laminated group of rotor cores having a large counterclockwise direction side (2) is superposed in the axial direction of the rotary shaft to constitute the rotor core;
A permanent magnet type rotating electrical machine, wherein the lamination group (1) and the lamination group (2) have different thickness ratios. A permanent magnet is disposed in a plurality of permanent magnet insertion holes in the stator core, and a stator in which concentrated winding armature windings are provided so as to surround the teeth in a plurality of slots formed in the stator core, In the permanent magnet type rotating electrical machine having a rotor facing the inner circumference of the stator via a gap and rotatably supported by a rotating shaft,
The rotor core formed by laminating a rotor core plate has a d-axis that is a magnetic flux axis of the permanent magnet, and a q-axis that is 90 degrees apart from the d-axis by an electrical angle.
The permanent magnet insertion hole passes straight through the rotor core plate in the stacking direction of the rotor core plate,
In order to collect the magnetic fluxes of the permanent magnets, a plurality of gap surfaces having different distances from the stator are provided on the outer peripheral surface of the rotor core facing the inner periphery of the stator, and the plurality of gap surfaces Is larger than the gap interval length on the d-axis side than the gap interval length on the q-axis side,
A laminated group (1) of rotor core plates having an equivalent gap interval length obtained by leveling the plurality of gap surfaces and having a large clockwise direction centered on the d-axis, and a laminated group of rotor cores having a large counterclockwise direction side (2) is superposed in the axial direction of the rotary shaft to constitute the rotor core;
A permanent magnet type rotating electrical machine characterized in that when the rotating direction of the rotor is counterclockwise, the stacking ratio of the stacked group (1) is larger than that of the stacked group (2). A permanent magnet is disposed in a plurality of permanent magnet insertion holes in the stator core, and a stator in which concentrated winding armature windings are provided so as to surround the teeth in a plurality of slots formed in the stator core, In the permanent magnet type rotating electrical machine having a rotor facing the inner circumference of the stator via a gap and rotatably supported by a rotating shaft,
The rotor core obtained by stacking the rotor core plates has a d-axis that is a magnetic flux axis of the permanent magnet, and a q-axis that is 90 degrees apart from the d-axis by an electrical angle;
The permanent magnet insertion hole passes straight through the rotor core plate in the stacking direction of the rotor core plate,
A plurality of magnetic pole slits provided between the outer periphery of the rotor and the permanent magnet insertion hole and penetrating the rotor core plate in the stacking direction are formed in an elongated shape extending in the outer peripheral direction of the rotor,
In order to collect the magnetic flux of the permanent magnet, a plurality of gap surfaces having different distances from the stator core are provided on the outer peripheral surface of the rotor core facing the inner periphery of the stator core, and the plurality of gap surfaces are provided. The gap surface has a gap interval length on the q-axis side larger than a gap interval length on the d-axis side,
On the contrary, the laminated group (1) of the rotor core plates in which the equivalent gap interval length obtained by leveling the plurality of gap surfaces is larger in the rear region in the rotational direction than the front region with the d-axis as a boundary, The rotor core is configured by superimposing a laminated group (2) of rotor cores in the direction of the rotational axis of the rotor core in which the front region in the rotational direction is larger than the direction in the rear region;
A permanent magnet type rotating electrical machine characterized in that the stacked group (1) has a larger thickness ratio of the stacked group (1) and the stacked group (2). In the permanent magnet type rotating electrical machine according to claim 1 or 2,
In the rotor core, one of the stacked group (1) and the stacked group (2) is N blocks in the axial direction, and the other is (N-1) blocks in the axial direction. A permanent magnet type rotating electrical machine characterized in that it is divided and the divided blocks of the laminated group (1) and the divided blocks of the laminated group (2) are alternately arranged in the axial direction. In the permanent magnet type rotating electrical machine according to claim 4,
Either one of the stacked group (1) or the stacked group (2) divided into N is divided into N = 2 in the axial direction, and the stacked group divided into (N-1) in the axial direction is an axis. A permanent magnet type rotating electrical machine characterized in that (N-1) = 1 division in the direction. In the permanent magnet type rotating electrical machine according to claim 4,
The N is N = 3, and is a permanent magnet type rotating electric machine. In the permanent magnet type rotating electrical machine according to any one of claims 1 to 5,
When the lamination thickness ratio in the axial direction of the lamination group (1) is L1, the lamination thickness ratio in the axial direction of the lamination group (2) is L2, and the rotation direction of the rotor is counterclockwise,
L2 <L1, 50% <L1 <85%
A permanent magnet type rotating electrical machine characterized in that it is configured as follows. In the permanent magnet type rotating electrical machine according to any one of claims 1 to 7,
The permanent magnet type rotating electrical machine, wherein the permanent magnet insertion holes are arranged in a V shape with the d axis as a center line. In the permanent magnet type rotating electrical machine according to claim 3,
The permanent magnet type rotating electrical machine, wherein the magnetic pole slit is inclined so as to approach the d-axis as it comes to the outer peripheral side of the rotor. In the permanent magnet type rotating electrical machine according to claim 3 or 9,
The plurality of magnetic pole slits are arranged such that an extension line that passes through the side surface or the inside of the magnetic pole slit along the longitudinal direction of the magnetic pole slit and extends to the outer periphery of the rotor intersects in the vicinity including on the d-axis. A permanent magnet type rotating electrical machine. In the permanent magnet type rotating electrical machine according to claim 3 or 10,
The permanent magnet type rotating electrical machine, wherein the plurality of magnetic pole slits are provided symmetrically about the d-axis as a center line. In the permanent magnet type rotating electrical machine according to any one of claims 1 to 11,
The small gap interval length is characterized in that the range of the arc in the rotation direction of the rotor core (opening angle around the rotation axis) is in the range of about 90 degrees to about 120 degrees in electrical angle. Permanent magnet type rotating electrical machine. In the permanent magnet type rotating electrical machine according to any one of claims 1 to 12,
A permanent magnet rotating electrical machine characterized in that the ratio of the number of poles of the rotor to the number of slots of the stator is 2: 3. In the permanent magnet type rotating electrical machine according to any one of claims 1 to 7,
The permanent magnet has a single-character shape (linear shape) extending in a direction intersecting with a radial line passing through the axis of the rotor or a V-shape having a vertex directed to the axis of the rotor. Magnet rotating electric machine. In the permanent magnet type rotating electrical machine according to any one of claims 1 to 14,
The rotor core includes a step portion formed between a large-diameter outer circumferential arc surface having a small gap interval length and a small-diameter outer arc surface having a large gap interval length, and the small outer circumferential arc. A permanent magnet type rotating electrical machine having a recess extending along the rotation axis direction on the q axis of the surface. The permanent magnet type rotating electrical machine according to claim 15,
The permanent magnet type rotating electrical machine, wherein the concave portion has a V-shaped cut shape with its apex directed to the axis of the rotor. In the permanent magnet type rotating electrical machine according to any one of claims 1 to 7,
The permanent magnet is formed in a single-letter shape (linear shape), and is arranged in a direction intersecting with a radial line passing through the axis of the rotor,
Between the adjacent permanent magnets, a concave portion extending along the rotation axis direction on the q axis is provided on the outer peripheral surface of the rotor core,
The permanent magnet rotating electrical machine according to claim 1, wherein the concave portion has a triangular shape in which an apex angle of the apex facing the axial center of the rotor is substantially a right angle.   A compressor equipped with the permanent magnet type rotating electrical machine according to any one of claims 1 to 17.

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