JP2013183510A - Permanent magnet type dynamoelectric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a permanent magnet type dynamoelectric machine having a rotor of I-shaped magnet arrangement, in which the permanent magnet end on the inner peripheral side of the rotor is less likely to be demagnetized.SOLUTION: The permanent magnet type dynamoelectric machine includes a magnetic body 31 having magnet insertion holes 4 arranged radially from the rotating shaft side, and a rotor 10 consisting of permanent magnets 5, 6 placed in the magnet insertion holes 4 and magnetized in the circumferential direction. The width direction dimension of the permanent magnet on the inner peripheral side of the rotor is set smaller than that on the outer peripheral side of the rotor, and the area between the magnetic poles of the permanent magnet 6 held on the inner peripheral side of the rotor is widened, thus reducing magnetic flux density of the magnetic poles and enhancing demagnetization resistance of the permanent magnet 6 on the inner peripheral side of the rotor.

Description

  The present invention relates to a permanent magnet type rotating electrical machine, and more particularly to a permanent magnet type rotating electrical machine having an I-shaped magnet arrangement having magnet insertion holes radially arranged on a rotor from a shaft side.

  In recent years, awareness of global environmental conservation and energy conservation has increased, and electric motors (permanent magnet synchronous machines) mounted on electric vehicles (EV), hybrid electric vehicles (HEV), and fuel cell vehicles, including compressors used in air conditioners and refrigerators. ) Is also required to be small and highly efficient.

  As a means for improving the output density of the permanent magnet synchronous machine, increasing the magnet surface area and increasing the amount of magnetic flux of the magnet can be mentioned. In order to increase the amount of magnetic flux of the magnet in a limited rotor cross section, it is necessary to devise a magnet arrangement, and typical arrangement methods include flat plate, V-shaped, and I-shaped magnet arrangement. Above all, the I-shaped magnet arrangement is a configuration in which the magnet is arranged from the rotor outer diameter toward the inner diameter, and the magnet length can be obtained according to the length in the radial direction, so that the magnet surface area is secured compared to other magnet arrangements. Is easy.

  The magnetic flux generated from the permanent magnet has several paths. One is a magnetic flux that passes through a magnetic pole portion made of a magnetic material, passes through a gap, passes through a stator, and then returns to the rotor. This magnetic flux is an effective magnetic flux that contributes to rotation. Magnetic flux having other paths becomes leakage magnetic flux that does not contribute to rotation. For example, the path | route which passes along the magnetic body part arrange | positioned at the permanent magnet edge part of a rotor inner diameter side and an outer diameter side is mention | raise | lifted. If these leakage magnetic fluxes can be reduced, the effective magnetic flux can be increased with the same magnet amount.

  In a permanent magnet type rotating electrical machine having an I-shaped magnet arrangement, for example, there is one described in Patent Document 1 as a structure for reducing leakage magnetic flux. Patent Document 1 includes a laminated iron core in which an annular connecting portion surrounding a rotating shaft and a fan-shaped magnetic pole portion are integrally formed, and a permanent magnet disposed between the magnetic pole portions, and the permanent magnet of the connecting portion is provided. A hollow part is formed in the inner part, an inner collar is formed by a laminated iron core between the permanent magnet and the hollow part, and a connecting part between adjacent hollow parts extends in the radial direction and is connected to the fan-shaped magnetic pole part. There has been proposed a rotor that connects the parts.

  According to this structure, the effective magnetic flux passes through a circulation path formed by a fan-shaped magnetic pole portion-rotor / stator air gap-stator. On the other hand, the leakage flux is a circulation path formed by a fan-shaped magnetic pole part-connecting part-connecting part, a circulation path formed by a fan-shaped magnetic pole part-inner collar-hollow part, and a fan-shaped magnetic pole part-outer collar-permanent magnet. It passes through the circulation path formed by the void outside. Since the latter two circulation paths have a large magnetic resistance due to the air gap, the leakage magnetic flux is small. There is no gap in the circulation path formed by the fan-shaped magnetic pole part-connecting part-connecting part, but the magnetic resistance can be increased by reducing the width of the connecting part, and the leakage flux of this circulating path is reduced. As a result, the effective magnetic flux increases.

Japanese Unexamined Patent Publication No. 2000-156946 JP 2010-11640 JP 2011-91911 A

  In a rotor with an I-shaped magnet arrangement, the distance between adjacent permanent magnets becomes shorter toward the inner diameter side of the rotor, so that the magnetic flux density tends to increase. For this reason, there exists a subject that it is easy to demagnetize, when a demagnetizing field is added in the circumferential direction both ends of the rotor inner diameter side of a permanent magnet. Further, when a hollow portion is provided on the inner diameter side of the rotor as in Patent Document 1, the amount of magnetic material on the inner peripheral side of the rotor is further reduced, so that it is easier to demagnetize. In Patent Document 1, demagnetization at the end portion of the permanent magnet on the inner peripheral side of the rotor is not considered.

  An object of the present invention is to provide a permanent magnet type rotating electrical machine in which a permanent magnet end portion on the inner peripheral side of the rotor is hard to demagnetize in a permanent magnet type rotating electrical machine having a rotor with an I-shaped magnet arrangement.

  Another object of the present invention is to reduce leakage magnetic flux generated at the magnet end portion on the rotor inner peripheral side and to make permanent on the rotor inner peripheral side in a permanent magnet type rotating electric machine having a rotor with an I-shaped magnet arrangement. An object of the present invention is to provide a permanent magnet type rotating electrical machine in which a magnet end portion is not easily demagnetized.

  The present invention relates to a permanent magnet type rotating electrical machine having a rotor composed of a magnetic body having magnet insertion holes arranged radially from the rotating shaft side and a permanent magnet arranged in the magnet insertion hole and magnetized in the circumferential direction. The width direction dimension on the rotor inner periphery side is made smaller than the width direction dimension on the rotor outer periphery side of the permanent magnet.

  Further, the present invention provides a permanent magnet type rotation having a rotor composed of a magnetic body having magnet insertion holes arranged radially from the rotating shaft side and a permanent magnet arranged in the magnet insertion holes and magnetized in the circumferential direction. In an electric machine, a hole or a non-magnetic material is provided between the rotating shaft and the permanent magnet, and the width direction dimension on the rotor inner periphery side is made smaller than the width direction dimension on the rotor outer periphery side of the permanent magnet. It is characterized by.

  According to the present invention, since the width of the inner periphery of the rotor of the permanent magnet is smaller than the width of the outer periphery of the rotor, the area between the magnetic poles sandwiched between the inner periphery of the rotor of the permanent magnet is increased. As a result, the magnetic flux density between the magnetic poles is reduced, the demagnetization resistance of the permanent magnet on the inner peripheral side of the rotor is improved, and a permanent magnet type rotating electrical machine that is difficult to demagnetize can be obtained.

  In addition, according to the present invention, since a hole or a non-magnetic material is provided between the rotating shaft and the permanent magnet, leakage magnetic flux generated at the end of the permanent magnet on the inner peripheral side of the rotor can be reduced. Since the width on the rotor inner peripheral side is smaller than the width on the rotor outer peripheral side, the area of the magnetic pole part sandwiched between the rotor inner peripheral side of the permanent magnet on the rotor inner peripheral side is increased, thereby The magnetic flux density between the magnetic poles is reduced, the demagnetization resistance of the permanent magnet on the inner peripheral side of the rotor is improved, and a permanent magnet type rotating electrical machine that is difficult to demagnetize can be obtained.

1 is an axial sectional view of a rotor of a permanent magnet type rotating electric machine according to a first embodiment of the present invention. Axial sectional view of a rotor of a permanent magnet type rotating electrical machine according to a second embodiment of the present invention. The figure which shows the relationship between the magnetic flux density and magnetic permeability in a magnetic body. The radial direction sectional view of the rotor of the permanent magnet type rotating electrical machine by the 3rd example of the present invention. The perspective view of the shaft fixing jig in the 3rd Example of this invention. The axial direction sectional view of the rotor of the permanent magnet type rotating electrical machine by the 4th example of the present invention. The figure which applied the permanent-magnet-type rotary electric machine of this invention to the compressor.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows a part of a sectional view perpendicular to the rotor axial direction of a permanent magnet type rotating electrical machine (permanent magnet synchronous machine) according to a first embodiment of the present invention. The permanent magnet synchronous machine includes a rotor 10 in which a permanent magnet is attached to a rotor core in the axial direction, and a stator (not shown) that is disposed opposite to the outer periphery of the rotor 10 with a predetermined gap and armature windings. And a shaft (rotating shaft) 13 mounted in the shaft insertion hole of the rotor 10.

  In the magnetic body 31, a plurality of magnet insertion holes 4 that are convex from the rotor outer diameter side toward the rotor inner diameter side are formed radially from the shaft side. The rotor 10 is composed of a rotor core made of a magnetic material 31 and permanent magnets 5 and 6 that are mounted in the magnet insertion hole 4 and are magnetized in the circumferential direction. A structure in which permanent magnets magnetized in the circumferential direction are arranged radially from the shaft side is called I-shaped magnet arrangement. In this embodiment, one permanent magnet is divided into two magnets (ferrite magnets): a first permanent magnet 5 disposed on the rotor outer diameter side and a second permanent magnet 6 disposed on the rotor inner diameter side. It consists of. The first permanent magnet 5 and the second permanent magnet 6 are magnetized in the circumferential direction, and the circumferential permanent magnet surface 5a has the same pole as the circumferential permanent magnet surface 5b of the opposing permanent magnet. The sandwiched magnetic body becomes the magnetic pole portion 30 having the same polarity as the permanent magnet surfaces 5a and 5b.

  A claw-shaped outer collar 36 is formed on the magnetic body 31, and the outer peripheral side of the rotor is held on the permanent magnet by the claw-shaped outer collar 36. A gap 29 serving as a magnetic resistance in the circumferential direction is formed between the opposing outer collars 36 at the outer circumferential end of the rotor of the first permanent magnet 5. In addition, the magnetic body 31 is formed with a rectangular hole 3 that is rounded inside the second permanent magnet 6 in the radial direction (between the second permanent magnet 6 and the shaft 13). The central portion of the second permanent magnet 6 is exposed in the hole 3. Inner collars 37 are formed at both ends of the air holes 3, and the inner peripheral side of the rotor of the permanent magnet 6 is held by the inner collars 37.

  In a conventional rotor including an I-shaped magnet arrangement including Patent Document 1, the distance between adjacent magnets decreases as the rotor inner diameter side is approached. In other words, since the area between the magnetic poles on the inner diameter side of the rotor is reduced, the magnetic flux density of the portion is increased. .

  On the other hand, in this embodiment, the permanent magnet 6 is sandwiched between the permanent magnets 6 by making the thickness in the width direction (magnetization direction thickness) smaller than the thickness in the width direction (magnetization direction thickness) of the permanent magnet 5. The area between the magnetic poles is increased. As a result, the magnetic flux density of the part decreases, and the demagnetization resistance of the permanent magnet 6 can be improved. In addition, in the V-shaped magnet arrangement, as described in Patent Documents 2 and 3, conventionally, the rotation of the magnet end portion that is the inner diameter side of the V-shaped central rotor core becomes the V-shaped left and right end portions. There has been proposed a magnet whose thickness increases toward the outer diameter side of the core. However, in the V-shaped magnet arrangement, since the demagnetization factor is only on the outer diameter side, the thickness of the outer diameter side magnet is increased to make it difficult for the outer diameter side permanent magnet to be demagnetized. On the other hand, in the I-shaped magnet arrangement, the distance between adjacent permanent magnets on the outer periphery side of the rotor is long and the area between the magnetic poles on the outer periphery side of the rotor is large, so there is almost no problem of demagnetization on the outer periphery side of the rotor. That is, the technical idea disclosed in Patent Documents 2 and 3 of the V-shaped magnet arrangement is not helpful in the I-shaped magnet arrangement targeted by the present invention. In the V-shaped magnet arrangement, the amount of magnetic material in the vicinity of the shaft increases due to the structure, and almost no demagnetization occurs on the inner diameter side of the permanent magnet, which is a problem in the I-shaped magnet arrangement. That is, the present invention finds and solves a specific problem of demagnetization on the rotor inner circumference side of a permanent magnet that occurs in an I-shaped magnet arrangement, and is a technique different from Patent Documents 2 and 3 of a V-shaped magnet arrangement. Is an ideal thought.

  Further, according to the present embodiment, it is possible to eliminate the difficulty of magnetizing the permanent magnet in the I-shaped magnet arrangement. That is, the magnetic field strength is inversely proportional to the distance according to Ampere's law. In the I-shaped magnet arrangement, when the magnet is magnetized with the permanent magnet incorporated in the rotor, the magnetic field strength decreases and the magnetism deteriorates toward the inner diameter of the rotor. When a magnetizing yoke or the like is disposed on the outer peripheral side of the rotor and the permanent magnets 5 and 6 are magnetized, the magnetization of the permanent magnet 6 is lower than that of the permanent magnet 5. The magnetizing characteristics of the permanent magnet are affected by the magnet thickness, that is, the permeance of the magnet. Magnetization becomes easier as the magnet becomes thinner with respect to the magnetization direction and permeance increases, that is, the easier the magnetic flux is passed. Therefore, in the case of the I-shaped magnet arrangement, the magnetism is reduced as the magnet is arranged on the inner diameter side, but the magnetization direction thickness of the permanent magnet 6 is made smaller than the magnetization direction thickness of the permanent magnet 5 as in this embodiment. Thus, the magnetization can be improved as compared with the conventional structure.

  In this embodiment, ferrite magnets are used as the first permanent magnet 5 and the second permanent magnet 6, but sintered magnets containing rare earth as a main component may be used. Moreover, you may form with an Alnico magnet, a bond magnet, etc. Moreover, in the present Example, although the 1st permanent magnet 5 and the 2nd permanent magnet 6 are made into the separate body structure, it is good also as a permanent magnet of the same kind of integral structure. In the case of forming with a ferrite magnet, it is easier to manufacture if it is configured separately. When the second permanent magnet 6 is made of a material having a higher residual magnetic flux density than the first permanent magnet 5 (for example, the first permanent magnet 5 is made of a ferrite magnet, and the second permanent magnet 6 is made of neodymium. In the case of a magnet, the connecting portion 35 is likely to be magnetically saturated with the same magnet size, so that the output is improved. Further, the first permanent magnet 5 or the second permanent magnet 6 may be configured by arranging the permanent magnets divided into a plurality of sheets in the axial direction or the circumferential direction. Further, the first permanent magnet 5 and the second permanent magnet 6 may be formed of one magnet of the same type, or may be formed of different types of magnets.

  In this embodiment, the magnet insertion hole is formed so as to have a convex shape from the rotor outer diameter side toward the rotor inner diameter side, but the width is gradually reduced toward the inner diameter side. Alternatively, it may be formed in a trapezoidal shape (or fan shape). Moreover, although it is set as the magnetic body as a constituent material of a rotor, you may comprise with a laminated steel plate and may comprise with a dust core.

  In the present embodiment, the outer collar 36 is formed on the magnetic body 31 and the outer peripheral side of the rotor of the permanent magnet is held by the outer collar. Therefore, the air gap 29 is formed at the outer peripheral end of the permanent magnet. As a result, the magnetic resistance of the air gap portion between the stator and the rotor becomes relatively smaller than the magnetic resistance of the air gap 29. Thereby, the magnetic flux generated at the end of the permanent magnet on the outer periphery side of the rotor becomes an effective magnetic flux passing through the stator through the air gap between the stator and the rotor. Further, a nonmagnetic material may be provided in the space 29 (groove). Note that, from the viewpoint of obtaining the effect of suppressing demagnetization, the effect of reducing leakage magnetic flux cannot be obtained, but the air gap 29 may be eliminated and the permanent magnet may be held by a magnetic material.

  Further, in this embodiment, since the air holes 3 are provided adjacent to the magnet insertion holes on the rotor inner diameter side, the leakage magnetic flux generated at the end portion of the permanent magnet 6 on the rotor inner peripheral side can be reduced. Moreover, since the leakage magnetic flux which passes through the connection part 32 and the connection part 35 is restrict | limited by the connection part 35, an effective magnetic flux increases by magnetically saturating the connection part 35 and reducing a magnetic permeability. In other words, reducing the width of the connecting portion 35 leads to an increase in effective magnetic flux. Further, increasing the hole 3 reduces the width of the connecting portion 35 and leads to an increase in effective magnetic flux, and reducing the hole 3 increases the width of the connecting portion 35 and improves the mechanical strength of the rotor. (The connecting portion 35 receives the centrifugal force of the permanent magnet received by the outer collar 36 together with the centrifugal force of the magnetic pole portion 30 via the magnetic pole portion 30, so that the mechanical strength is improved by increasing the width of the connecting portion 35. ). Therefore, the size of the hole 3 is determined from the viewpoint of both the reduction of the leakage magnetic flux and the improvement of the mechanical strength. Note that, from the viewpoint of obtaining the effect of suppressing demagnetization, the effect of reducing leakage magnetic flux cannot be obtained, but the holes 3 may be eliminated.

  FIG. 2 is a cross-sectional view perpendicular to the rotor axial direction of a permanent magnet type rotating electrical machine (permanent magnet synchronous machine) according to a second embodiment of the present invention. In FIG. 2, the stator and the shaft are not shown. In addition, the basic configuration of the rotor and the shapes and arrangements of the first and second permanent magnets 5 and 6 in the present embodiment are the same as those in the first embodiment described above, and thus the description thereof is omitted.

  In the first embodiment, to reduce the leakage magnetic flux on the inner diameter side of the stator, it is effective to reduce the width of the connecting portion 35 as described above. However, as described above, the joint portion 35 receives a centrifugal force in the radial direction, and stress concentrates on the inner corner of the second permanent magnet 6 and the corner of the hole 3. And the width of the connecting portion 35 is required to be wide. That is, it is difficult to achieve both reduction of leakage magnetic flux and improvement of strength. In this embodiment, in addition to improving the demagnetization resistance on the inner peripheral side of the permanent magnet, the mechanical strength is improved and the leakage magnetic flux is reduced.

  In this embodiment, the end of the permanent magnet on the inner diameter side of the rotor is held by the rib 39 extending in the circumferential direction. The rib 39 is connected to the yoke 11 extending in the radial direction from the annular connecting portion 32. The end of the yoke 11 opposite to the rib (inner side of the rotor) is connected to an annular connecting part 32, and the yoke 11 is arranged radially from the rotor center side. Holes 3 are formed on both sides of the yoke 11, and the yokes 11 are arranged radially through the holes 3 in the circumferential direction. A shaft insertion hole 12 into which the shaft 13 is inserted is provided inside the annular coupling portion 32.

  The path of the magnetic flux is determined so that the magnetic path length is short and the magnetic permeability is high, that is, the magnetic resistance is low. In order to increase the effective magnetic flux, it is necessary to reduce the path of the leakage magnetic flux. In this embodiment, there are a path (1) passing through the magnetic pole portion 30 and the rib 39 and a path (2) passing through the outer collar 36 and the air gap 29 as main leakage flux paths. As described above, the leakage magnetic flux passing through the path (2) has a large magnetic resistance due to the air gap 29, so that the leakage magnetic flux is reduced.

  In order to reduce the leakage magnetic flux passing through the path (1), it is effective to lower the magnetic permeability of the rib 39 by magnetic saturation. FIG. 3 shows the magnetic properties of a general-purpose electromagnetic steel sheet. Magnetic saturation is determined by the characteristics of the magnetic material. In FIG. 3, when the magnetic flux density exceeds 1.6T, the magnetic permeability is almost the same as that of air. Therefore, as a measure for reducing the magnetic permeability of the rib, it is possible to increase the magnetic flux density and reduce the magnetic saturation by reducing the rib width (the thickness in the radial direction).

  Although the mechanical strength of the rotor is reduced by making the ribs thinner, in this embodiment, the yoke 11 is provided as shown in FIG. 2, and the thickness of the permanent magnet 6 disposed on the inner diameter side is reduced. By doing so, the stress concentration portions 38 are dispersed as shown in FIG. 2 to improve the mechanical strength.

  According to this embodiment, in addition to the effects of the first embodiment, it is possible to improve the mechanical strength of the rotor and reduce the leakage magnetic flux.

  The configuration of the first and second permanent magnets 5 and 6, the configuration of the magnet insertion hole, the configuration of the rotor, and their modifications are the same as those in the first embodiment.

  In this embodiment, the holes 3 are pentagonal, but other shapes may be used. For example, a triangular shape, a circular shape, an arc shape, or a kamaboko shape may be used. An arc may be provided at each apex of the hole 3. Further, a material having a lower magnetic permeability than the nonmagnetic material or the magnetic pole portion may be provided in the hole 3. In this embodiment, the rotor is composed of 6 poles, but any number of poles may be used as long as it is 2 poles or more.

  FIG. 4 shows a rotor radial direction cross-sectional view (cross-sectional view cut along the rotor axial direction) of a permanent magnet type rotating electrical machine (permanent magnet synchronous machine) according to a third embodiment of the present invention, and FIG. The perspective view of the shaft fixing jig used in the 3rd Example is shown. In FIG. 4, illustration of the stator is omitted. In addition, the basic configuration of the rotor and the shapes and arrangements of the first and second permanent magnets 5 and 6 in the present embodiment are the same as those in the first and second embodiments described above, and thus the description thereof is omitted.

  As shown in FIG. 5, the shaft fixing jig 7 used in this embodiment includes a cylindrical portion 9 and a hollow shaft 8 that is integrally provided at the center of the cylindrical portion 9. As shown in FIG. 4, a through hole is formed in the center of the cylindrical portion 9, and a shaft insertion hole is formed by the inner side of the rotor connecting portion 32 located inside the hollow shaft 8 and the through hole of the cylindrical portion 9. 12 is formed. As shown in FIG. 5, the hollow shaft 8 is formed of a plurality of arc pieces having a size that can enter the air holes 3 formed in the magnetic body 31 of the rotor 10. A plurality of screw insertion holes 20 are formed in the cylindrical portion 9. The shaft fixing jig 7 is made of a non-magnetic material (aluminum). As shown in FIG. 4, the shaft fixing jig 7 is disposed so as to sandwich the rotor from both axial sides of the rotor 10, and is fastened to the rotor by bolts 21 and nuts 22. The cylindrical portion 9 and the shaft 13 of the shaft fixing jig 7 are fastened by shrink fitting or the like, and the torque generated by the rotor is loaded via the shaft fixing jig 7 and the shaft 13 (the rotating member of the compressor or the power of the automobile). To the transmission mechanism).

  According to this embodiment, the rotor 10 and the shaft 13 can be easily integrated. That is, when the shaft 13 and the rotor core are fastened by shrink fitting, in the first and second embodiments, the air holes 3 are provided to form inside the rotor connecting portion 32 due to stress during shrink fitting. There is a problem that the shaft insertion hole 12 to be deformed is not able to be secured, and a margin required for fastening cannot be secured. On the other hand, in this embodiment, since the rotor (iron core) and the shaft are connected via the shaft fixing jig 7, the shaft insertion hole 12 formed inside the rotor connecting portion 32 is used. The inner diameter of the shaft 13 can be made larger than the outer diameter of the shaft 13, and the stress generated at the time of shaft shrink fitting is not applied to the rotor (iron core), and further, the interference of the rotor is not required. Moreover, the shaft fixing jig 7 can also serve as a balance weight.

  In this embodiment, the shaft fixing jig is provided on both sides of the rotor in the axial direction and is held on both sides of the rotor. However, the shaft fixing jig is provided only on one side of the rotor and is held on one side of the rotor. You may do it. In this embodiment, when the shaft fixing jig and the rotor are fastened, the screw insertion hole 20 is also provided in the rotor. However, a part of the hole 3 may be used as the screw insertion hole. In addition, the shaft fixing jig and the rotor may be fastened together with a resin, or may be fixed via a hollow shaft 8 provided in the shaft fixing jig. Note that the hollow shaft 8 is not essential when the shaft fixing jig is screwed with the bolt 21 and the nut 22.

  In this embodiment, aluminum is used as the material of the shaft fixing jig 7, but a metal such as stainless steel, copper, brass or the like may be used as long as it is a non-magnetic material.

  FIG. 6 is a cross-sectional view perpendicular to the rotor axial direction of a permanent magnet type rotating electrical machine (permanent magnet synchronous machine) according to a fourth embodiment of the present invention. In FIG. 6, the stator and the shaft are not shown. In addition, the basic configuration of the rotor and the shapes and arrangements of the first and second permanent magnets 5 and 6 in this embodiment are the same as those in the first to third embodiments described above, and thus the description thereof is omitted.

  In this embodiment, a third permanent magnet 40 is provided in place of the hole 3 in the second embodiment. In this embodiment, the rotor outer peripheral side of the permanent magnet is held without forming a gap at the outer peripheral end of the permanent magnet. However, as in the first and second embodiments, the outer periphery of the magnetic body 31 is not attached. You may make it form a collar and hold | maintain the rotor outer peripheral side of a permanent magnet with an outer collar.

  In the present embodiment, the yokes 11 are arranged radially through the third permanent magnet 40 in the circumferential direction. The third permanent magnet 40 is divided into the same number as the magnetic pole portions 31 of the rotor, and the radial surface 41 of the third permanent magnet is radially magnetized to the same pole as the opposing magnetic pole portion. The rib 39 is magnetically saturated by the magnetic flux of the third permanent magnet 40 and the magnetic flux of the first and second permanent magnets 5 and 6 so as to reduce the leakage magnetic flux passing through the magnetic pole portion 30 and the path (1) passing through the rib 39. I have to. Moreover, the structure which arrange | positions the 3rd permanent magnet 40 provides the output improvement effect accompanying the magnet amount increase.

  The third permanent magnet 40 may be a sintered magnet whose main component is a rare earth, may be formed of a bonded magnet, or may be formed of a ferrite magnet or an anilco magnet. The third permanent magnet 40 may be composed of a single permanent magnet, or a plurality of permanent magnets may be arranged in the axial direction or the circumferential direction. The third permanent magnet 40 may be the same type of integrated permanent magnet, or may be a different type of permanent magnet. The rotor is composed of 6 poles, but any number of poles may be used as long as it is 2 poles or more. The third permanent magnet 30 is a circular arc. However, if the magnetization direction is the same as that of the magnetic pole portion, it may be a triangle, a circle, a polygon, or a kamaboko shape. The same effect can be obtained by combining the third embodiment and attaching a ring magnet to the shaft. That is, in Example 3, since it is not necessary to shrink fit the shaft and the rotor core, the configuration in which the permanent magnet magnetized in the radial direction is attached to the outer periphery of the shaft 13 in the same manner as the third permanent magnet is similarly applied. The effect of reducing leakage magnetic flux and improving output can be obtained.

  The above-described permanent magnet type rotating electrical machine of each embodiment of the present invention can be applied to electric motors mounted on EVs, HEVs, and fuel cell vehicles, including compressors used in air conditioners and refrigerators. Among these products, FIG. 7 shows an example in which the permanent magnet type rotating electrical machine of the present invention is applied to a compressor.

  The compressor 100 includes a cylindrical sealed compression container 200, a permanent magnet type rotating electrical machine 300 that is installed in the sealed compression container 200 and serves as a drive motor, and is driven by the permanent magnet type rotating electrical machine 300 and is contained in the sealed compression container 200. And a compressing unit 400 installed in the apparatus. As the permanent magnet type rotating electrical machine 300, the permanent magnet type rotating electrical machine of the first to fourth embodiments described above is used.

  The permanent magnet type rotating electrical machine 300 includes a rotor 700 fixed to a rotary shaft 600 rotatably supported in a sealed compression container 200 via bearings 500A and 500B, and a circumferential gap in the rotor 700. And a stator 800 facing each other.

  The compression unit 400 of the compressor 100 includes a turning scroll member 240 that turns by a crankshaft 230 formed at the upper end of the rotating shaft 600 and a fixed scroll member 250 that meshes with the turning scroll member 240, and the turning scroll member 240. Has a movable spiral wrap 270 standing upright on the end plate 260, and the fixed scroll member 250 includes a fixed spiral wrap 280 that meshes with the movable spiral wrap 270, and an end plate that supports the fixed spiral wrap 280 upright. 290.

  When the movable spiral wrap 270 of the compression unit 400 configured as described above is swung by the crankshaft 230, the compression chamber 300 formed by the movable spiral wrap 270 and the fixed spiral wrap 280 is centered from the outer diameter side. In the process of moving toward, the volume is gradually reduced and the compression operation is performed.

  The gas supplied from the gas supply port 310 to the compression chamber 300 located on the outer diameter side reaches the compression chamber 300 on the center side while being compressed, and is discharged into the sealed compression container 200 from the discharge port 320 provided here, The discharged compressed gas is discharged out of the compressor 100 through a discharge pipe 330 provided on the side wall of the sealed compression container 200.

  The present invention provides a permanent magnet rotating electric machine having an I-shaped magnet arrangement that is relatively easy to increase the magnet surface area and increase the amount of magnetic flux of the magnet in a limited rotor cross section as means for improving the output density of the rotating electric machine. Since the demagnetization resistance of the permanent magnet can be improved, the performance of the small and highly efficient permanent magnet type rotating electrical machine can be maintained for a long time. This is suitable for compressors used in air conditioners and refrigerators, and products used for a long time such as EVs, HEVs, and fuel cell vehicles. In other words, the rotating electrical machine of the present invention is applied to these products. By applying, the performance of these products can be maintained for a long time.

3: hole, 4: magnet insertion hole, 5: first permanent magnet, 5a, 5b: permanent magnet surface, 6: second permanent magnet, 7: shaft fixing jig, 8: hollow shaft, 9: cylindrical part , 10: rotor, 11: yoke, 12: shaft insertion hole, 13: shaft, 20: screw insertion hole, 21: bolt, 22: nut, 29: air gap, 30: magnetic pole part, 31: magnetic body, 32: Connecting part, 35: bridging part, 36: outer brim, 37: inner brim, 38: stress concentration part, 39: rib, 40: third permanent magnet, 41: radial surface of the third permanent magnet

Claims (13)

A permanent magnet type rotating electrical machine composed of a stator provided with armature windings, and a stator provided with a permanent magnet and a rotor arranged via a predetermined gap,
The rotor is composed of a magnetic body having magnet insertion holes arranged radially from the rotating shaft side, and a permanent magnet which is arranged in the magnet insertion hole and is magnetized in the circumferential direction of the rotor,
The permanent magnet type rotating electrical machine, wherein the permanent magnet has a smaller size in the width direction on the inner peripheral side of the rotor than the width direction size on the outer peripheral side of the rotor.   2. The permanent magnet type rotating electrical machine according to claim 1, wherein a hole or a nonmagnetic material is provided between a rotor inner peripheral side of the permanent magnet and the rotating shaft.   2. The magnetic body according to claim 1, wherein the magnetic body includes an annular coupling portion in which the rotation shaft is disposed on an inner circumference, and an outer circumference of the annular coupling portion and a rotor inner circumference side of the permanent magnet. A plurality of formed holes, a rib formed between the magnet insertion hole and the hole and extending in a circumferential direction on the inner peripheral side of the rotor of the permanent magnet, the rib and the annular connecting portion, A permanent magnet type rotating electrical machine, characterized in that it is provided with yokes that are connected to each other and radially arranged through the air holes in the circumferential direction.   4. The permanent magnet type rotating electrical machine according to claim 3, wherein a nonmagnetic material is disposed in the hole.   The permanent magnet type rotating electrical machine according to any one of claims 1 to 4, wherein the magnet insertion hole is formed in a convex shape toward an inner peripheral side of the rotor.   6. The permanent magnet type rotating electric machine according to claim 5, wherein the permanent magnet is divided into a plurality of parts and arranged in the magnet insertion hole.   7. The permanent magnet type rotating electric machine according to claim 6, wherein the permanent magnet is composed of a ferrite magnet.   5. The permanent magnet according to claim 1, wherein the permanent magnet comprises two or more permanent magnets, and remains on the rotor inner peripheral side of the magnet insertion hole from the rotor outer peripheral side of the magnet insertion hole. A permanent magnet type rotating electrical machine comprising a permanent magnet having a high magnetic flux density.   4. The permanent magnet according to claim 3, wherein a permanent magnet different from the permanent magnet is disposed in the hole, and the another permanent magnet is a magnetic pole formed between circumferential directions of the radially disposed permanent magnets. The poles of the other permanent magnet at the position facing the magnetic pole part are magnetized in the radial direction so as to be the same as the poles of the magnetic pole part. Permanent magnet type rotating electric machine.   The permanent magnet type rotating electrical machine according to any one of claims 1 to 8, wherein a permanent magnet is attached to an outer periphery of the rotating shaft facing a rotating shaft insertion hole of the rotor.   The rotary shaft fixing jig according to any one of claims 1 to 10, comprising a rotary shaft fixing jig made of a non-magnetic material and having an insertion hole for the rotary shaft, wherein the rotary shaft fixing jig and the rotary shaft are fixed, A permanent magnet type rotating electrical machine, wherein the rotor is fixed.   The permanent magnet type rotating electric machine according to claim 11, wherein the rotary shaft fixing jig also serves as a balance weight.   A compressor using the permanent magnet type rotating electrical machine according to any one of claims 1 to 12 as a drive motor.

Images