JP2010110128A - Permanent magnet rotating electrical machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a permanent magnet rotating electrical machine which is reduced in weight by being thinned in the axial direction and provides high output. <P>SOLUTION: In a permanent magnet rotating electrical machine comprising: a stator having an armature winding; and a rotor having permanent magnets rotatably supported to the stator and arranged in a Halbach array, two arrays of permanent magnets arranged in a Halbach array are provided in the peripheral direction from the center of rotation of the rotor, and the armature winding of the stator is provided between the arrays of permanent magnets. Each array of permanent magnets is composed of a combination of nearly triangular magnets. The directions of magnetic poles of individual permanent magnets in the outside array of permanent magnets and in the inside array of permanent magnets are the same in the radial direction, and reverse in the peripheral direction. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a permanent magnet rotating electric machine having permanent magnets arranged in a Halbach array on a rotor rotatably supported by a stator having an electronic winding.

  A permanent magnet rotating electrical machine in which permanent magnets are arranged in Halbach is a main magnetic pole magnet in which N poles and S poles are alternately arranged in the radial direction, and magnetized in a direction other than the radial direction (for example, in the circumferential direction) The auxiliary magnet is provided (see, for example, Patent Documents 1 and 2). The main magnetic pole magnet and the auxiliary magnet of the permanent magnet rotating electrical machine in which the permanent magnets are arranged in the Halbach array are substantially cylindrical as a whole. When the permanent magnets are arranged in the Halbach array, the magnetic force in a specific direction can be increased. The rotating electrical machine having the permanent magnets arranged in the Halbach arrangement can achieve high output without increasing the size.

FIG. 14 is a magnetic flux density distribution diagram showing a magnetic flux density distribution of a rotating electrical machine having permanent magnet arrays arranged in a conventional Halbach array. The armature winding 4 is wound around the yoke core 15, and a magnetic flux is formed between the permanent magnet 16, the armature winding 4, and the yoke core 15.
JP 2006-320109 A (FIG. 1) JP 2004-350427 A (FIGS. 1 and 2)

  However, in the thing of patent document 1, since the iron core is used for a stator or a rotor, the mass of a rotary electric machine becomes heavy, and in order to aim at high output, it is necessary to lengthen in the axial direction or radial direction of a rotary electric machine. . Also, in Patent Document 2, since the iron core is used for the stator, the mass of the rotating electrical machine becomes heavy, and in order to achieve high output, it is necessary to lengthen it in the axial direction or the radial direction of the rotating electrical machine.

  An object of the present invention is to provide a permanent magnet rotating electrical machine that can reduce the weight of the rotating electrical machine in the axial direction, reduce the weight, and obtain a high output.

  The permanent magnet rotating electrical machine of the present invention is a permanent magnet rotating electrical machine comprising a stator having armature windings and a rotor having permanent magnets supported rotatably with respect to the stator and arranged in a Halbach array. Two permanent magnet rows in which the child is arranged in the Halbach direction from the center of rotation are provided, and the armature winding of the stator is provided between the permanent magnet rows, each of the permanent magnet rows being a substantially triangular magnet. The direction of the magnetic pole of the outer permanent magnet of the permanent magnet array and the direction of the magnetic pole of the inner permanent magnet of the permanent magnet array are the same in the radial magnetic pole direction, and the circumferential magnetic pole direction. Is directed in the opposite direction.

  According to the present invention, it is possible to provide a permanent magnet rotating electric machine that can reduce the weight by reducing the shape of the rotating electric machine in the axial direction and can achieve high output.

  FIG. 1 is an axial sectional view of an example of a permanent magnet rotating electrical machine 1 according to an embodiment of the present invention. The permanent magnet rotating electrical machine 1 is configured by forming an armature winding 4 and a shaft 7 on a stator 6 and forming a permanent magnet row 2, a permanent magnet row 3, and a bearing 14 on a rotor 5.

  The stator 6 is formed with a shaft 7 and a projection for attaching the armature winding 4 at the center. For example, when three-phase alternating current is used, the armature winding 4 is wound in the order of U phase-V phase-W phase. A bearing 14 is configured between the stator 6 and the rotor 5, and the rotor 5 is configured to rotate on the stator 6. The rotor 5 is provided with two substantially cylindrical permanent magnet rows 2 and permanent magnet rows 3 formed in a Halbach arrangement in the circumferential direction. The rotor 5 has two rows of convex portions on the side facing the stator 6, the permanent magnet 16 of the permanent magnet row (outside) 2 is provided on the outer convex portion of the rotor 5, and the inner convex portion is provided on the inner convex portion. The permanent magnets 16 of the permanent magnet row (inner side) 3 are attached by, for example, adhesion. The armature winding 4 is arranged between the permanent magnet row 2 and the permanent magnet row 3 attached to the rotor 5.

FIG. 2 is a radial cross-sectional view of an example of the permanent magnet rotating electrical machine 1 according to the embodiment of the present invention. The permanent magnet row 2 and the permanent magnet row 3 attached to the rotor 5 have a magnetic pole arrangement as shown in FIG. The permanent magnet row 2 and the permanent magnet row 3 arranged in Halbach form a substantially cylindrical shape by a combination of permanent magnets 16 having a substantially triangular cross section. The permanent magnet row 2 and the permanent magnet row 3 are alternately arranged in the radial direction and the circumferential direction in the magnetic pole direction. The permanent magnet row 2 and the permanent magnet row 3 are substantially triangular of the permanent magnet 16 whose magnetic pole direction is in the radial direction. It is comprised by arrange | positioning so that the bottom side may face the armature winding 4 side. Moreover, the permanent magnet row 2 and the permanent magnet row 3 are configured by arranging the magnetic poles in the radial direction of the permanent magnets 16 whose radial directions are adjacent to each other in the circumferential direction. And the permanent magnets 16 in which the directions of the magnetic poles of the permanent magnet row 2 and the permanent magnet row 3 face each other in the radial direction are arranged so as to face in the same direction.

  The permanent magnet 16 whose magnetic pole direction is disposed between the permanent magnets 16 whose radial direction is the radial direction has a substantially triangular cross section. The permanent magnet row 2 and the permanent magnet row 3 are configured by arranging so that the base of the substantially triangular shape of the permanent magnet 16 whose magnetic pole direction is in the circumferential direction faces the outside of the permanent magnet rotating electrical machine 1. In addition, the permanent magnet row 2 and the permanent magnet row 3 are configured by arranging the magnetic poles adjacent to each other in the circumferential direction so that the circumferential magnetic poles of the permanent magnet 16 in the circumferential direction are alternately arranged. The permanent magnets 16 having the circumferential direction of the magnetic poles of the permanent magnet row 2 and the permanent magnet row 3 are arranged so as to face in opposite directions.

  FIG. 3 is a distribution diagram of magnetic flux lines in the axial section of the permanent magnet rotating electric machine 1 when the permanent magnet row 2 and the permanent magnet row 3 in the Halbach array are constituted by the substantially triangular permanent magnets 16. Thereby, the change of the magnetic flux density in the space sandwiched between the permanent magnet row 2 and the permanent magnet row 3 becomes smooth, and a sinusoidal magnetic flux density distribution can be obtained. Further, the vibration during rotation of the permanent magnet rotating electrical machine 1 can be reduced by the sinusoidal magnetic flux density distribution.

  Here, FIG. 17 shows the magnetic flux density distribution in the radial direction in the conventional permanent magnet rotating electrical machine 1. Compared with FIG. 17 of the conventional example, it can be seen that the magnetic flux density distribution of FIG. Further, in the conventional permanent magnet rotating electric machine 1, the armature winding is wound around the yoke core 15, which causes an increase in mass. In this manner, the rotor 5 is provided with two substantially cylindrical permanent magnet rows 2 and 3 arranged in a Halbach array, and the stator 6 is disposed between the substantially cylindrical permanent magnet row 2 and the permanent magnet row 3. The armature winding 4 can be provided to reduce the axial width of the permanent magnet rotating electrical machine 1.

  By constructing two substantially cylindrical permanent magnet rows 2 and permanent magnet rows 2 arranged in a Halbach array, the magnetic flux density is higher than that of the conventional example, so that the output of the permanent magnet rotating electrical machine 1 can be increased without increasing the shape. Can be realized.

  Moreover, the permanent magnet row | line | column 2 and the permanent magnet row | line | column 3 can comprise a substantially cylindrical shape, without the adjacent permanent magnets 16 repelling by the combination of the substantially triangular shaped permanent magnet 16, respectively. Therefore, it becomes possible to manufacture the permanent magnet row 2 and the permanent magnet row 3 without using the mounting support, and the manufacturing cost can be reduced.

  Next, the relationship between the cross-sectional areas of the permanent magnet 16 having a radial magnetic pole direction and the permanent magnet 16 having a circumferential magnetic pole direction constituting the permanent magnet row 2 will be described. The same applies to the permanent magnet row 3.

The cross-sectional area of the permanent magnet 16 whose magnetic pole direction is radial and the permanent magnet 16 whose magnetic pole direction is circumferential are the same, or the permanent magnet 16 whose magnetic pole direction is radial direction is the permanent magnet 16 whose magnetic pole direction is circumferential direction. 3, the magnetic flux in the radial direction outside the permanent magnet row 2 and inside the permanent magnet row 3 is reduced as shown in FIG. 3, and the leakage magnetic flux can be reduced. When the direction of the radial permanent magnet 16 is larger than the cross-sectional area of the permanent magnet 16 in the circumferential direction, an arbitrary magnetic path can be formed. Therefore, as will be described later, the permanent magnet rotating electrical machine 1 can obtain high output even when the ferromagnetic member 12 is disposed outside the permanent magnet row 2 and the ferromagnetic member 13 is disposed inside the permanent magnet row 3. .

  FIG. 4 is an axial cross-sectional view of another example of the permanent magnet rotating electrical machine 1 according to the embodiment of the present invention. The example shown in FIG. 4 differs from the example shown in FIG. 1 in the radial direction of the outer permanent magnet row 2 in the substantially cylindrical permanent magnet row 2 and the permanent magnet row 3 arranged in the Halbach array on the rotor 5. The dimension is longer than the radial dimension of the inner permanent magnet row 3. The same elements as those in FIG. 1 are denoted by the same reference numerals, and redundant description is omitted.

  By making the radial dimension of the outer permanent magnet row 2 longer than the radial dimension of the inner permanent magnet row 3, the magnetic flux density of the permanent magnets 16 of the outer permanent magnet row 2 can be increased. The output (torque) of the electric machine 1 can be increased.

  FIG. 5 is an axial sectional view of another example of the permanent magnet rotating electrical machine 1 according to the embodiment of the present invention. In the example shown in FIG. 5, the volume of the substantially cylindrical permanent magnet row 2 and the permanent magnet row 16 of the permanent magnet row 3 arranged in the Halbach array on the rotor 5 is substantially the same as the example shown in FIG. Further, the radial dimension of the inner permanent magnet row 3 is longer than the radial dimension of the outer permanent magnet row 2. The same elements as those in FIG. 1 are denoted by the same reference numerals, and redundant description is omitted.

  By making the volumes of the substantially cylindrical permanent magnet row 2 and the permanent magnet row 3 arranged in the Halbach array on the rotor 5 substantially the same, the energy densities of the permanent magnet row 2 and the permanent magnet row 3 are almost the same. Thus, the magnetic flux interlinking the armature winding 4 is made uniform. Thereby, a large output (torque) can be obtained.

  Next, the rotor 5 in which the permanent magnet row 2 and the permanent magnet row 3 arranged in the Halbach array are arranged is formed of a nonmagnetic metal member or a resin member. In general, the rotor 5 is configured by laminating thin electromagnetic steel plates. However, the rotor 5 is a nonmagnetic metal member or resin member that can be easily processed, and the permanent magnet row 2 and the permanent magnet row 3 are attached to the rotor 5. To make it easier, further reduce weight and reduce manufacturing costs.

  The stator 6 on which the armature winding 4 is disposed is also formed of a nonmagnetic metal member or a resin member. In general, the stator 6 is configured by laminating thin electromagnetic steel plates in the same manner as the rotor 5. However, the stator 6 is a nonmagnetic metal member or a resin member that can be easily processed to reduce the weight and reduce the manufacturing cost.

  Next, the armature winding 4 disposed on the stator 6 is formed by concentrated winding or a printed circuit board. FIG. 6 is a partially cutaway radial sectional view of the permanent magnet rotating electric machine 1 when the armature winding 4 is formed by concentrated winding. As shown in FIG. 6, by making the armature winding 4 into a concentrated winding, the winding can be accommodated between the permanent magnet row 2 and the permanent magnet row 3. Thereby, in the permanent magnet rotating electric machine 1, the armature winding 4 does not spread in the axial direction. Further, the axial length of the permanent magnet rotating electrical machine 1 can be reduced. Furthermore, since the armature winding 4 can be wound around a bobbin (not shown) and mounted on the stator 6, the manufacturing cost can be reduced.

  FIG. 7 is a sectional view in the axial direction of the permanent magnet rotating electrical machine 1 when the armature winding 4 is formed of a printed board. As shown in FIG. 7, since the armature winding 4 is formed of the printed circuit board 11, the weight can be reduced as compared with the copper wire used in the conventional example. Therefore, the permanent magnet rotating electrical machine 1 can be reduced in size and weight.

  Further, the armature winding 4 disposed on the stator 6 may be formed wider than the width of the permanent magnet surface facing the armature winding. FIG. 8 is an axial cross-sectional view of the permanent magnet rotating electrical machine 1 when the armature winding 4 is formed wider than the width of the permanent magnet surface facing the armature winding 4. As shown in FIG. 8, the axial length of the armature winding 4 is longer (wider) than the width of the opposing permanent magnet row 2 and permanent magnet row 3 surfaces. The length of the armature winding 4 in the axial direction is longer (wider) than the width of the opposing permanent magnet row 2 and permanent magnet row 3 surface, so that the permanent magnet row 2 and permanent magnet row are arranged with respect to the armature winding 4. Thus, the amount of magnetic fields of the three magnetic fields can be increased, and the magnetic fluxes of the permanent magnet row 2 and the permanent magnet row 3 can be obtained efficiently. Therefore, the output of the permanent magnet rotating electrical machine 1 can be increased.

  Further, the armature winding 6 disposed on the stator 6 is formed using any one of a carbon wire, a superconducting wire, and a high temperature superconducting wire. When a carbon wire is used as the winding material of the armature winding 4, the weight can be reduced compared to the copper wire used in the conventional example, so that the permanent magnet rotating electrical machine 1 can be reduced in weight. FIG. 9 is a sectional view in the axial direction of the permanent magnet rotating electrical machine 1 when a superconducting wire or a high-temperature superconducting wire is used for the armature winding 4. As shown in FIG. 9, the armature winding of the superconducting wire or the high temperature superconducting wire is disposed in the cryo 8, and the cryo tube 8 is connected to the cryo 8. The end of the low-temperature pipe 9 is connected to the refrigerator 10, and the refrigerator 8 is driven so that the inside of the cryo 8 can maintain the superconducting state. By using a superconducting wire or a high-temperature superconducting wire as the winding material of the armature winding 4, the electric resistance of the armature winding 4 can be reduced to zero, and the loss of current can be eliminated. Output can be increased.

  Next, a ferromagnetic member for reducing leakage magnetic flux may be provided in the permanent magnet array in the Halbach array. FIG. 10 is a cross-sectional view in the axial direction of the permanent magnet rotating electrical machine 1 when the ferromagnetic member 12 is provided outside the permanent magnet array 2 arranged in the Halbach array on the outside. As shown in FIG. 10, the ferromagnetic member 12 is provided outside the permanent magnet row 2 arranged in the Halbach array on the outside.

  FIG. 11 is a sectional view in the axial direction of the permanent magnet rotating electrical machine 1 when the ferromagnetic member 13 is provided inside the permanent magnet row 3 arranged in the Halbach array inside. As shown in FIG. 11, the ferromagnetic member 13 is provided inside the permanent magnet row 3 arranged in the Halbach array inside.

  FIG. 12 shows a permanent magnet rotating electric machine in which ferromagnetic members 12 and 13 are provided on both the outer side of the permanent magnet row 2 in the Halbach array arranged on the outside and the inner side of the permanent magnet row 3 in the Halbach array on the inner side. FIG. As shown in FIG. 12, ferromagnetic members 12 and 13 are provided on both the outside of the permanent magnet row 2 arranged in the Halbach array on the outside and the inside of the permanent magnet row 3 arranged in the Halbach array on the inside. The ferromagnetic members 12, 13 and the permanent magnet row 2 and the permanent magnet row 3 are connected to the rotor 5 by adhesion, for example.

  When leakage magnetic flux is generated on the radially outer side of the permanent magnet row 2 and on the radially inner side of the permanent magnet row 2, the outer ferromagnetic member 12 and the inner ferromagnetic member 13 are attached to the permanent magnet row 2 and the permanent magnet row 3. Thus, since the leakage magnetic flux passes through the ferromagnetic members 12 and 13, the leakage of the magnetic flux can be reduced. If the leakage magnetic flux decreases, the magnetic flux in the gap between the permanent magnet row 2 and the permanent magnet row 3 and the armature winding 4 can be increased. Thereby, the leakage magnetic flux decreases and the magnetic flux in the gap increases, so that the output of the permanent magnet rotating electrical machine 1 can be increased.

  Next, in order to prevent the permanent magnet row 2 and the permanent magnet row 3 from being separated from the rotor 5 by centrifugal force due to rotation, a permanent magnet pressing mechanism 17 formed of a nonmagnetic member may be provided. FIG. 13 is a cross-sectional view in the axial direction of the permanent magnet rotating electrical machine 1 when a permanent magnet pressing mechanism 17 formed of a nonmagnetic member is provided on the permanent magnet row 2 of the Halbach array and the permanent magnet 16 of the permanent magnet row 3. As shown in FIG. 13, a permanent magnet pressing mechanism 17 formed of a nonmagnetic member is provided in the permanent magnet row 2 and the permanent magnet row 3 in the Halbach array.

  Moreover, the permanent magnet pressing mechanism 17 is comprised with the strip | belt-shaped board or wire formed with the nonmagnetic member. Thereby, it can prevent that the permanent magnet 16 peels from the stator 6 while the permanent magnet rotary electric machine 1 rotates, and a high output can be obtained stably.

  Next, the permanent magnet 16 of the permanent magnet row 2 and the permanent magnet row 3 may be housed in a case 18 formed of a nonmagnetic member. FIG. 14 is an axial cross-sectional view of the permanent magnet rotating electrical machine 1 when the permanent magnet row 2 in the Halbach array and the permanent magnet 16 in the permanent magnet row 3 are housed in a case 18 formed of a nonmagnetic member. As shown in FIG. 14, the permanent magnet row 2 and the permanent magnet row 3 in a Halbach array are housed in a case 18 formed of a nonmagnetic member. The case is attached to the rotor 5. In this case, since the permanent magnet 16 is inserted into the case 18 and manufactured, the manufacturing cost can be reduced. Furthermore, since the case 18 can be easily attached to the stator 6, the manufacturing cost can be reduced.

  Next, the armature winding 4 may be concentratedly wound around a winding member 19 formed of a nonmagnetic member, and the concentrated winding member 19 may be attached to the stator 6 together. FIG. 15 is a radial cross-sectional view of the permanent magnet rotating electrical machine 1 showing an example of the arrangement of the permanent magnet 16 and the winding member 19 of the winding. When the armature winding 4 is concentratedly wound around the winding member 19 formed of a nonmagnetic member in advance and then attached to the stator 6, the manufacturing becomes easy and the manufacturing cost can be reduced.

  The plurality of armature windings 4 that are concentrated may be integrated by impregnating with resin. By being integrated, the handling can be facilitated and the fixing to the stator 6 can be facilitated.

  Next, the permanent magnet 16 of the permanent magnet row 2 and the permanent magnet row 3 may be formed of a rare earth magnet (for example, a neodymium magnet). Or you may form with what added dysprosium in the neodymium magnet. By using a rare earth magnet as the permanent magnet, the magnetic force is increased and a high output can be obtained. Furthermore, dysprosium has a function of increasing the magnetic force of the neodymium magnet, and high output can be achieved by using the permanent magnet 16 in which dysprosium is added to the neodymium magnet.

  Next, the individual permanent magnets 16 of the permanent magnet row 2 and the permanent magnet row 3 are manufactured by separately attaching a magnet whose magnetic pole direction is in the circumferential direction and a magnet whose magnetic pole direction is in the radial direction to the rotor 5 separately. It is good also as a method. As an example, the permanent magnet 16 having the circumferential direction of the magnetic pole of the permanent magnet 16 is attached to the rotor 5 by adhesion or the like. Then, after the circumferential permanent magnet 16 is attached to the rotor 5, the radial permanent magnet 16 is attached by bonding or the like. According to this manufacturing method, the permanent magnet 16 can be attached to the rotor 5 without being affected by the magnetic force of the adjacent permanent magnet 16, and the manufacturing cost can be reduced.

  Further, as an example, when the permanent magnet 16 whose magnetic pole direction is oriented in the circumferential direction is attached to the rotor 5, a magnet attachment formed of a nonmagnetic member at a position where the permanent magnet 16 whose magnetic pole direction is oriented in the radial direction is attached. It is good also as a manufacturing method provided with the support 20 and 21 and attaching the permanent magnet 16 to the magnet attachment support 20 and 21 to a guide. FIG. 16 is a radial cross-sectional view of the permanent magnet rotating electrical machine 1 showing an example of the magnet attachment supports 20 and 21 for attaching the permanent magnet 16 to the rotor 5 as the permanent magnet row 2 in the circumferential direction. As described above, in this embodiment, a combination of substantially triangular magnets can form a substantially cylindrical shape without repulsion between adjacent magnets, but the magnet mounting supports 20 and 21 are surrounded by guides. The permanent magnet 16 can be attached to the rotor 5 more easily by using the manufacturing method of attaching the permanent magnet 16 as the permanent magnet row 2 in the direction.

  According to the embodiment of the present invention, since no iron core is used for the rotor 5 and the stator 6 of the permanent magnet rotating electrical machine 1, the weight can be reduced. Since substantially triangular permanent magnets arranged in Halbach are arranged and the armature winding 4 is arranged between the permanent magnet row 2 and the permanent magnet row 3, the width in the axial direction can be reduced. Further, two rows of substantially triangular permanent magnets arranged in a Halbach array are arranged to achieve an efficient magnetic flux density distribution, so that high output can be achieved. Since an iron core is not used for the rotor 5 and the stator 6, manufacturing is facilitated and manufacturing cost can be reduced.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

An axial direction sectional view of an example of a permanent magnet rotary electric machine concerning an embodiment of the invention. The radial direction sectional view of an example of the permanent magnet rotary electric machine of an embodiment of the invention. The magnetic force line distribution map which shows an example of the magnetic force line distribution of the permanent magnet rotary electric machine concerning embodiment of this invention. The axial direction sectional view of other examples of the permanent magnet rotary electric machine concerning an embodiment of the invention. The axial direction sectional drawing of another example of the permanent magnet rotary electric machine concerning embodiment of this invention. FIG. 3 is a partially cutaway radial direction cross-sectional view of a permanent magnet rotating electric machine when armature windings in the embodiment of the present invention are formed by concentrated winding. The axial direction sectional view of the permanent magnet rotating electrical machine at the time of forming the armature winding in the embodiment of the present invention with the printed circuit board. The axial direction sectional view of the permanent magnet rotary electric machine at the time of forming the armature winding in embodiment of this invention wider than the width | variety of the permanent magnet surface which opposes it. The axial direction sectional view of the permanent magnet rotary electric machine at the time of using a superconducting wire or a high temperature superconducting wire for the armature winding in an embodiment of the invention. The axial direction sectional view of a permanent magnet rotating electrical machine at the time of providing a ferromagnetic member outside the permanent magnet row of the Halbach arrangement arranged on the outside in an embodiment of the invention. The axial direction sectional view of the permanent magnet rotating electrical machine at the time of providing a ferromagnetic member inside the permanent magnet row | line | column of the Halbach arrangement | positioning arrange | positioned inside in embodiment of this invention. Axial section of a permanent magnet rotating electrical machine when a ferromagnetic member is provided on both the outside of a permanent magnet array of Halbach array arranged on the outside and the inside of a permanent magnet of Halbach array arranged on the inside in an embodiment of the present invention Figure. The axial direction sectional view of the permanent magnet rotating electrical machine which has the permanent magnet press mechanism in an embodiment of the invention. The axial sectional view of the permanent magnet rotary electric machine which has the case which stores the permanent magnet in the embodiment of the present invention. The radial direction sectional view of the permanent magnet rotating electrical machine which has the winding member of the permanent magnet and winding in the embodiment of the present invention. The radial direction sectional view of the permanent magnet rotating electrical machine of an example of the manufacturing method of the permanent magnet row in the embodiment of the present invention. The magnetic flux density distribution figure which showed the magnetic flux density distribution of the permanent magnet rotary electric machine which has the permanent magnet row | line | column which carried out the conventional Halbach arrangement | sequence.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Permanent magnet rotary electric machine, 2 ... Permanent magnet row (outside), 3 ... Permanent magnet row (inner side), 4 ... Armature winding, 5 ... Rotor, 6 ... Stator, 7 ... Shaft, 8 ... Cryo, DESCRIPTION OF SYMBOLS 9 ... Low temperature piping, 10 ... Refrigerator, 11 ... Printed circuit board, 12 ... Outer ferromagnetic member, 13 ... Inner ferromagnetic member, 14 ... Bearing, 15 ... Yoke iron core, 16 ... Permanent magnet, 17 ... Permanent magnet pressing mechanism, DESCRIPTION OF SYMBOLS 18 ... Case, 19 ... Winding member of winding, 20 ... Permanent magnet attachment support (outside), 21 ... Permanent magnet attachment support (inside)

Claims (5)

In a rotating electrical machine comprising a stator having armature windings and a rotor having permanent magnets that are rotatably supported with respect to the stator and arranged in Halbach,
The rotor is provided with two rows of permanent magnet arrays in which Halbach is arranged in the circumferential direction from the center of rotation, the armature winding of the stator is provided between the permanent magnet rows, and the permanent magnet rows are substantially triangular. The direction of the magnetic poles of the outer permanent magnets in the permanent magnet row and the direction of the magnetic poles of the inner permanent magnets in the permanent magnet row are the same in the radial direction, and the magnetic poles in the circumferential direction. A permanent magnet rotating electrical machine characterized by being directed in the opposite direction.   The individual permanent magnets of the permanent magnet row are arranged so that the base of the substantially triangular shape of the permanent magnet with the radial direction of the magnetic pole faces the armature winding side. The permanent magnet rotating electric machine described.   The individual permanent magnets of the permanent magnet row have the same volume as that of the magnetic poles having the radial direction and the direction of the magnetic poles having the circumferential direction. The permanent magnet rotating electric machine according to 1.   The individual permanent magnets of the permanent magnet row have a volume with a magnetic pole direction in the radial direction smaller than a volume with a magnetic pole direction in the circumferential direction. The permanent magnet rotating electric machine according to 1.   The individual permanent magnets of the permanent magnet row have a volume of magnetic poles whose radial direction is larger than a volume of magnetic poles whose circumferential direction is circumferential. The permanent magnet rotating electric machine according to 1.

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