JP2009201343A - Permanent magnet rotating electrical machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the weight of a rotating electrical machine by thinning it in the axial direction, and to provide a permanent magnet rotating electrical machine capable of obtaining high output. <P>SOLUTION: In the permanent magnet rotating electrical machine comprising a stator 6, having armature winding 4 and a rotor 5 having a permanent magnet rotatably supported to the stator 6 and arranged in a Halbach array, two permanent magnet series 2 and 3 which are arranged in Halbach array are provided from the center of rotation of the rotor 5 to the peripheral direction, and the armature winding 4 of the stator 6 is provided between the permanent magnet series 2 and 3. Relating to the directions of the magnetic poles of the outside and the inside permanent magnets of an array of permanent magnets 2 and 3, for the permanent magnets 2 and 3, the directions of the magnet poles in the radial direction are identical, and the directions of the magnet poles in the peripheral direction are reverse in the directions. <P>COPYRIGHT: (C)2009,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 that is rotatably supported by a stator having an armature winding.

  A permanent magnet rotating electrical machine in which permanent magnets are arranged in a Halbach arrangement is provided with a main magnetic pole magnet in which N poles and S poles are alternately arranged in the radial direction and on both sides of the main magnetic pole magnet in a direction other than the radial direction (for example, in the circumferential direction). It is provided with a magnetized auxiliary magnet (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. 18 is a magnetic flux density distribution diagram showing a magnetic flux density distribution of a rotating electrical machine having a conventional Halbach array of permanent magnet arrays. 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 by reducing the shape of the rotating electrical machine in the axial direction and can 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 rows of permanent magnets arranged in Halbach in the circumferential direction from the center of rotation of the child are provided, and the armature winding of the stator is provided between the permanent magnet rows, and the permanent magnet row is arranged outside the permanent magnet row. The direction of the magnetic poles of the permanent magnets and the direction of the magnetic poles of the inner permanent magnets of the permanent magnet array are the same in the direction of the radial magnetic poles, and are opposite in the direction of the magnetic poles in the circumferential direction. To do.

  The permanent magnet row arranged on the rotor in Halbach is longer in the radial direction than the permanent magnet row arranged on the outer side, or the permanent magnet row arranged on the outer side. It is formed longer in the radial direction.

  The rotor having the permanent magnet array arranged in Halbach is formed of a nonmagnetic metal member or a resin member. The stator is formed of a nonmagnetic metal member or a resin member. Furthermore, the armature windings arranged on the stator are formed by concentrated windings or printed boards. Further, the armature winding disposed on the stator is formed wider than the width of the permanent magnet surface facing the armature winding.

  As the armature winding arranged on the stator, any one of a carbon wire, a superconducting wire, and a high-temperature superconducting wire is used. The permanent magnets of the Halbach array arranged outside and inside the permanent magnet rows of the Halbach array arranged on the outside or inside of the permanent magnet array of the Halbach arrangement arranged on the outside or inside the permanent magnet array of the Halbach arrangement arranged on the outside. Ferromagnetic members are provided on both inside rows.

  The permanent magnet array arranged on the rotor is held by a permanent magnet pressing mechanism made of a nonmagnetic member in the circumferential direction or the axial direction of the rotor, or the permanent magnet is stored in a case formed of a nonmagnetic member. Held. The permanent magnet holding mechanism of the permanent magnet row arranged on the rotor is constituted by a belt-like plate or a wire.

  The armature winding has a structure in which concentrated winding is performed on a winding member formed of a nonmagnetic member, and the concentrated winding member is attached to the stator. In addition, the winding wound around the winding member of the winding has a structure in which the concentrated winding member is impregnated with resin and fixed to the stator.

  The permanent magnets of the permanent magnet array are formed of rare earth magnets (for example, neodymium magnets), or are formed by adding dysprosium to neodymium magnets. The individual permanent magnets of the permanent magnet array are each attached to the rotor with a magnet whose magnetic pole is oriented in the circumferential direction and a magnet whose magnetic pole is oriented in the radial direction separately. When mounting a permanent magnet with the magnetic pole facing in the circumferential direction on the rotor, use a magnet mounting support formed of a non-magnetic member at the position where the permanent magnet with the magnetic pole facing in the radial direction is installed. Attach a permanent magnet to the guide.

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

  FIG. 1 is an axial sectional view of an example of a permanent magnet rotating electrical machine 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 permanent magnet rows 2 and 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 3 formed in a Halbach array 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 rows 2 and 3 attached to the rotor 5.

  FIG. 2 is a radial cross-sectional view of an example of the permanent magnet rotating electric machine according to the embodiment of the present invention. The permanent magnet rows 2 and 3 attached to the rotor 5 have a magnetic pole arrangement as shown in FIG. That is, the magnetic poles magnetized in the radial direction are configured such that the magnetic poles of the outer permanent magnet row 2 and the permanent magnets of the inner permanent magnet row 3 are in the same direction. Regarding the permanent magnets magnetized in the circumferential direction between the magnetic poles magnetized in the radial direction, the magnetic poles of the outer permanent magnet row 2 and the inner permanent magnet row 3 are arranged in opposite directions. To do.

  Next, FIG. 3 is a magnetic flux density distribution diagram showing an example of the magnetic flux density distribution of the permanent magnet rotating electric machine according to the embodiment of the present invention, and FIG. 4 is a diagram of the magnetic force line distribution of the permanent magnet rotating electric machine according to the embodiment of the present invention. It is a magnetic force line distribution map which shows an example.

  As shown in FIG. 3, it can be seen that the magnetic fluxes of the permanent magnet arrays 2 and 3 are linked to the armature winding 4. The rotor 5 is rotated by passing, for example, a three-phase alternating current through the armature winding 4. As can be seen from FIGS. 3 and 4, it can be seen that a large amount of magnetic flux is generated in the permanent magnets magnetized in the radial direction. That is, a large torque can be obtained by interlinking with the armature winding 4. The magnetic fluxes of the permanent magnets magnetized in the circumferential direction are opposite to each other in the outer permanent magnet row 2 and the inner permanent magnet row 3 and function to cancel each other's magnetic flux. Comparing the magnetic flux density distribution in the radial direction with FIG. 18 of the conventional example, it can be seen that the magnetic flux density distribution of FIG. 3 can obtain approximately twice as much magnetic flux as the magnetic flux density distribution of FIG. Further, FIG. 18 shows the result of winding the armature winding 4 around the yoke core 15, which causes an increase in mass.

  In this way, the rotor 5 is provided with two substantially cylindrical permanent magnet rows 2 and 3 arranged in a Halbach array, and the armature winding 4 of the stator 6 is disposed between the substantially cylindrical permanent magnet rows 2 and 3. By providing, the width of the permanent magnet rotating electrical machine 1 in the axial direction can be reduced. Further, by forming two substantially cylindrical permanent magnet rows arranged in Halbach, the magnetic flux density is higher than in the conventional example, so that it is possible to increase the output without increasing the shape of the permanent magnet rotating electric machine.

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

  Since the radial dimension of the outer permanent magnet row 2 is 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) can be increased.

  FIG. 6 is an axial sectional view of another example of the permanent magnet rotating electrical machine according to the embodiment of the present invention. The example shown in FIG. 6 is different from the example shown in FIG. 1 in that the volume of the permanent magnets 16 of the substantially cylindrical permanent magnet arrays 2 and 3 arranged in the Halbach array on the rotor 5 is substantially the same. The dimension in the radial direction of the permanent magnet row 3 is longer than the dimension in the radial direction 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 arrays 2 and 3 arranged in the Halbach array on the rotor 5 substantially the same, the energy densities of the permanent magnet arrays 2 and 3 become substantially the same, and the armature winding The magnetic flux that links the wires 4 is made uniform. Thereby, a large output (torque) can be obtained.

  Next, the rotor 5 in which the permanent magnet arrays 2 and 3 arranged in Halbach 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, but is made of a nonmagnetic metal member or a resin member that can be easily processed to facilitate the attachment of the permanent magnet rows 2 and 3 to the rotor 5. In addition, it will 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. 7 is a partially cutaway radial sectional view of a permanent magnet rotating electrical machine when the armature winding 4 is formed by concentrated winding. As shown in FIG. 7, 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. 8 is an axial cross-sectional view of a permanent magnet rotating electrical machine when the armature winding 4 is formed of a printed board. As shown in FIG. 8, 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. Accordingly, the permanent magnet rotating electrical machine 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. 9 is a cross-sectional view in the axial direction of a permanent magnet rotating electrical machine when the armature winding 4 is formed wider than the width of the permanent magnet surface facing it. As shown in FIG. 9, the length of the armature winding 4 in the axial direction is longer (wider) than the width of the opposing permanent magnet rows 2 and 3. By making the axial length of the armature winding 4 longer (wider) than the width of the opposing permanent magnet rows 2 and 3, the magnetic fields of the permanent magnet rows 2 and 3 are linked to the armature winding 4. The amount to be performed can be increased, and the magnetic flux of the permanent magnet arrays 2 and 3 can be obtained efficiently. Therefore, the output of the permanent magnet rotating electrical machine 1 can be increased.

  Further, the armature winding 4 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 can be reduced in weight. FIG. 10 is a sectional view in the axial direction of a permanent magnet rotating electric machine when a superconducting wire or a high-temperature superconducting wire is used for the armature winding 4. As shown in FIG. 10, 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. High output can be achieved.

  Next, a ferromagnetic member for reducing leakage magnetic flux may be provided in the permanent magnet array in the Halbach array. FIG. 11 is a sectional view in the axial direction of a permanent magnet rotating electrical machine when the ferromagnetic member 12 is provided outside the permanent magnet row 2 arranged in the Halbach array on the outside. As shown in FIG. 11, the ferromagnetic member 12 is provided outside the permanent magnet row 2 in the Halbach array arranged outside.

  FIG. 12 is a sectional view in the axial direction of a permanent magnet rotating electrical machine when the ferromagnetic member 13 is provided inside the permanent magnet row 3 arranged in the Halbach array inside. As shown in FIG. 12, the ferromagnetic member 13 is provided inside the permanent magnet row 3 arranged in the Halbach array inside.

  FIG. 13 shows a permanent magnet rotating electrical 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 outer side and the inner side of the permanent magnet row 3 in the Halbach array on the inner side. FIG. As shown in FIG. 13, 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 and 13 and the permanent magnet arrays 2 and 3 are connected to the rotor 5 by adhesion, for example.

  In the magnetic flux density distribution shown in FIG. 3, it can be seen that a small amount of magnetic flux is generated on the radially outer side of the outer permanent magnet row 2 and on the radially inner side of the inner permanent magnet row 2. That is, a slight leakage magnetic flux is generated. Therefore, by attaching the outer ferromagnetic member 12 and the inner ferromagnetic member 13 to the permanent magnet arrays 2 and 3, since the leakage flux passes through the ferromagnetic members 12 and 13, the leakage of the magnetic flux can be reduced. If the leakage flux decreases, the magnetic flux in the gap between the permanent magnet arrays 2 and 3 and the armature winding 4 can be increased. As a result, the leakage magnetic flux decreases and the magnetic flux in the gap increases, so that the output of the permanent magnet rotating electrical machine can be increased.

  Next, a permanent magnet pressing mechanism 17 formed of a nonmagnetic member may be provided in order to prevent the permanent magnet rows 2 and 3 from being separated from the rotor 5 by centrifugal force due to rotation. FIG. 14 is a sectional view in the axial direction of a permanent magnet rotating electrical machine when a permanent magnet pressing mechanism 17 formed of a nonmagnetic member is provided on the permanent magnets 16 of the Halbach array of permanent magnets 2 and 3. As shown in FIG. 14, the permanent magnets 16 in the Halbach array of permanent magnets 2 and 3 are held by the rotor 5 by a permanent magnet pressing mechanism 17 formed of a nonmagnetic member. The permanent magnet pressing mechanism 17 is configured by, for example, a belt-like plate or wire formed of a nonmagnetic member. Thereby, it is possible to prevent the permanent magnet 16 from being detached from the rotor 5 while the permanent magnet rotating electrical machine 1 is rotating, and a high output can be stably obtained.

  Next, the permanent magnets 16 of the permanent magnet rows 2 and 3 may be housed in a case 18 formed of a nonmagnetic member. FIG. 15 is an axial cross-sectional view of the permanent magnet rotating electrical machine when the permanent magnets 16 of the Halbach array of permanent magnets 2 and 3 are housed in a case 18 formed of a nonmagnetic member. As shown in FIG. 15, permanent magnet arrays 2 and 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 rotor 5, 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. 16 is a radial cross-sectional view of a permanent magnet rotating electrical machine showing an example of the arrangement of the permanent magnets 16 of the permanent magnet rows 2 and 3 and the winding member 19 of the winding. The armature winding 4 is concentratedly wound around a winding member 19 formed of a nonmagnetic member in advance, and then attached to the stator 6 to facilitate manufacture and reduce manufacturing costs.

  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 magnets 16 of the permanent magnet arrays 2 and 3 may be formed of rare earth magnets (for example, neodymium magnets). 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 arrays 2 and 3 can be manufactured by separately attaching a magnet whose magnetic pole is oriented in the circumferential direction and a magnet whose magnetic pole is oriented in the radial direction to the rotor 5 separately. Good. 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. 17 is a radial cross-sectional view of a permanent magnet rotating electrical machine showing an example of magnet mounting supports 20 and 21 for mounting the permanent magnet 16 to the rotor 5. By using the manufacturing method in which the permanent magnets 16 are attached to the magnet mounting supports 20 and 21 as guides, the permanent magnets 16 can be easily mounted on the rotor 5 without being affected by the magnetic force of the adjacent permanent magnets 16. Cost can be reduced.

  According to the embodiment of the present invention, an iron core is not used for the rotor 5 and the stator 6 of the permanent magnet rotating electric machine, so that the weight can be reduced. Since two rows of substantially cylindrical permanent magnets arranged in Halbach are arranged and the armature winding 4 is arranged between the permanent magnets 2 and 3, the width in the axial direction can be reduced. Further, two rows of substantially cylindrical 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.

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 flux density distribution figure which shows an example of the magnetic flux density distribution of the permanent magnet rotary electric machine concerning embodiment of this 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 direction of permanent magnet rotating electrical machine when ferromagnetic member is provided on both outer side of inner side of permanent magnet array of Halbach array arranged outside and inner side of permanent magnet array of inner side of Halbach array arranged in the embodiment of the present invention Sectional drawing. 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 in the embodiment of the present invention. The magnetic flux density distribution figure which showed the magnetic flux density distribution of the rotary electric machine which has the permanent magnet row | line | column with the conventional Halbach array.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Permanent magnet rotary electric machine, 2 ... Permanent magnet (outside), 3 ... Permanent magnet (inside), 4 ... Armature winding, 5 ... Rotor, 6 ... Stator, 7 ... Shaft, 8 ... Cryo, 9 ... Low temperature piping, 10 ... refrigerator, 11 ... printed circuit board, 12 ... ferromagnetic member (outside), 13 ... ferromagnetic member (inside), 14 ... bearing, 15 ... yoke iron core, 16 ... permanent magnet, 17 ... permanent magnet retainer Mechanism, 18 ... Case, 19 ... Winding member of winding, 20 ... Permanent magnet mounting support (outside), 21 ... Permanent magnet mounting support (inside)

Claims (6)

In a permanent magnet rotating electric 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 a Halbach array, the Halbach in the circumferential direction from the rotation center of the rotor Two permanent magnet rows arranged are arranged, and the armature winding of the stator is provided between the permanent magnet rows. The permanent magnet row includes the direction of the magnetic pole of the outer permanent magnet and the permanent magnet. A permanent magnet rotating electrical machine characterized in that the direction of the magnetic poles of the inner permanent magnets in the row is the same as the direction of the magnetic poles in the radial direction and the direction of the magnetic poles in the circumferential direction is opposite. The permanent magnet array arranged in Halbach on the rotor has a permanent magnet array arranged outside is longer in the radial direction than a permanent magnet array arranged inside, or a permanent magnet array arranged inside is permanent. The permanent magnet rotating electric machine according to claim 1, wherein the permanent magnet rotating machine is longer in a radial direction than the magnet array. The permanent magnet rotating electric machine according to claim 1, wherein the armature winding disposed on the stator uses a carbon wire, a superconducting wire, or a high-temperature superconducting wire. The Halbach array disposed outside and inside the permanent magnet array of the Halbach array disposed outside or inside the permanent magnet array of the Halbach array disposed outside or inside the permanent magnet array of the Halbach array disposed outside. 2. The permanent magnet rotating electric machine according to claim 1, wherein a ferromagnetic member is provided on both insides of the array of permanent magnets. The permanent magnet array disposed on the rotor is held by a permanent magnet pressing mechanism configured by a nonmagnetic member in the circumferential direction or the axial direction of the rotor, or the permanent magnet is formed on a case formed of a nonmagnetic member. The permanent magnet rotating electric machine according to claim 1, wherein the permanent magnet rotating electric machine is stored and held. The armature winding is structured such that the winding is concentrated on a winding member of a winding formed of a non-magnetic member, and the concentrated winding member is attached to the stator. The permanent magnet rotating electrical machine according to any one of 5.

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