JP2012175755A - Permanent magnet rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a permanent magnet rotary electric machine which efficiently cool heat generated by an armature winding provided to a rotary electric machine.SOLUTION: The permanent magnet rotary electric machine is provided with two permanent magnet arrays 2 and 3 where a rotor 5 of the rotary electric machine comprising a stator having a coil winding 4 and the rotor 5 supported rotatably on the stator and having permanent magnets 16 arranged in a Halbach array is arranged peripherally from the center of an axis of rotation in an iron-core-less state, and also provided with the coil winding 4 of the stator between the permanent magnet arrays 2 and 3. In the permanent magnet arrays 2 and 3, in the stator such that the outside permanent magnets 16 of the permanent magnet array 2 have magnetic poles in the same radial direction with magnetic poles of the inside permanent magnets 16 of the permanent magnet array 3, but have the opposite peripheral direction, the coil winding 4 is molded out of a nonmagnetic mold member.

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) on both circumferential sides of the main magnetic pole magnet. 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.

  Moreover, the conventional permanent magnet rotating electric machine is provided with an iron core. Therefore, the magnetic flux concentrates on the iron core, and the magnetic flux in the gap between the rotor and the stator does not change smoothly. For this reason, harmonic torque irregularities (torque ripples) are generated, causing vibration and noise. On the other hand, the magnetic flux is concentrated between the gaps by applying the Halbach array to the magnet array, and the permanent magnet rotating electrical machine without iron core has a large torque ripple even if the magnetic flux changes smoothly and generates a large torque. Don't be.

  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. Further, in the rotating electric machine having such a permanent magnet array arranged in Halbach, it is necessary to cool the armature winding.

  Specifically, Joule heat generated from the coil is conducted to the mounting base mainly by heat conduction, and is radiated from the surface of the stator frame to the atmosphere by natural convection. Therefore, it is important to reduce the thermal resistance from the coil to the mounting base and the stator frame. Although the coil and the stator frame seem to be in contact at first glance, there is actually an air layer. The air layer has a high thermal resistance, and it is difficult to transfer the heat of the coil to the stator frame.

  Moreover, the permanent magnet rotating electric machine without an iron core has a small ripple because it does not have an iron core. However, since the permanent magnet rotating electrical machine without an iron core uses a non-magnetic material for the stator frame, vibration attenuation is small with respect to the transmitted vibration. For this reason, the vibration may expand at the stator frame.

  Furthermore, the stator frame takes a long processing time because the nonmagnetic material is cut from the metal. For this reason, cost reduction is an issue for permanent magnet rotating electrical machines that do not require iron cores.

  An object of the present invention is to provide a permanent magnet rotating electrical machine capable of efficiently cooling the heat generated by coil windings provided in the rotating electrical machine.

  A permanent magnet rotating electrical machine according to an embodiment of the present invention is a rotating electrical machine including a stator having coil windings and a rotor having permanent magnets that are rotatably supported by the stator and arranged in a Halbach array. The rotor is provided with two rows of permanent magnets arranged in a Halbach array without a core in the circumferential direction from the center of the rotating shaft, and the stator coil winding is provided between the permanent magnet rows. The direction of the magnetic pole of the outer permanent magnet of the permanent magnet row and the direction of the magnetic pole of the inner permanent magnet of the permanent magnet row are the same for the direction of the magnetic pole in the radial direction, and the opposite direction for the direction of the magnetic pole in the circumferential direction, The coil winding is molded with a non-magnetic mold member.

  ADVANTAGE OF THE INVENTION According to this invention, the permanent magnet rotary electric machine which can cool efficiently the heat_generation | fever of the coil winding provided in the rotary electric machine, gives a vibration attenuation | damping to a stator flame | frame, and can raise the productivity effect at the time of mass production can be provided.

The axial direction sectional view of the permanent magnet rotary electric machine concerning a 1st embodiment. FIG. 3 is a perspective view of a stator frame according to the first embodiment. FIG. 3 is a perspective view of a stator frame according to the first embodiment. The radial direction sectional view of the permanent magnet rotating electrical machine concerning a 1st embodiment. The magnetic flux density distribution figure which shows an example of the magnetic flux density distribution of the permanent magnet rotary electric machine which concerns on 1st Embodiment. The magnetic force line distribution map which shows an example of the magnetic force line distribution of the permanent magnet rotary electric machine which concerns on 1st Embodiment. The axial direction sectional view of the permanent magnet rotary electric machine concerning a 1st embodiment. The axial direction sectional view of the permanent magnet rotary electric machine concerning a 2nd embodiment. The axial direction sectional view of the permanent magnet rotary electric machine concerning a 3rd embodiment. The axial direction sectional view of the permanent magnet rotary electric machine concerning a 4th embodiment. The axial direction sectional view of the permanent magnet rotary electric machine concerning a 5th embodiment. The axial direction sectional view of the permanent magnet rotary electric machine concerning a 6th embodiment. The perspective view of the stator frame which concerns on 6th Embodiment. The axial direction sectional view of the permanent magnet rotary electric machine concerning a 7th embodiment. The perspective view of the stator frame which concerns on 7th Embodiment. The axial direction sectional view of the permanent magnet rotary electric machine concerning an 8th embodiment. The perspective view of the stator frame which concerns on 7th Embodiment. 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.

  Embodiments will be described with reference to the drawings. FIG. 1 is an axial cross-sectional view of a permanent magnet rotating electrical machine 1 according to the first embodiment. The permanent magnet rotating electrical machine 1 is an iron core-less rotating electrical machine. The permanent magnet rotating electrical machine 1 is configured by forming an armature winding 4 and a shaft 7 on a stator frame 6 and forming permanent magnet rows 2 and 3 and a bearing 14 on a rotor 5. In the first embodiment, the stator frame 6 and the armature winding 4 are molded by the resin mold member 8.

  Here, FIG. 2 is a perspective view of the stator frame 6 provided with the armature winding 4 and the shaft 7 molded by the resin mold member 8. FIG. 3 is a perspective view of the stator frame 6 provided with the armature winding 4 and the shaft 7 in a state in which the resin mold member 8 in the radial direction of the armature winding 4 is removed from the state shown in FIG. .

  A shaft 7 is formed at the center of the stator frame 6. 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. The armature winding 4 is formed of concentrated winding. The armature winding 4 is formed by a coil 42 in which a winding is wound around a bobbin 41. The armature winding 4 is composed of a plurality of bobbins 41 in the circumferential direction around a shaft 7 that is a rotating shaft.

  A bearing 14 is formed between the stator frame 6 and the rotor 5, and the rotor 5 is configured to rotate on the stator frame 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 frame 6, and the permanent magnets 16 of the permanent magnet row (outer side) 2 are formed on the outer convex portions of the rotor 5, and the inner convex portions are provided on the inner convex portions. The permanent magnet 16 of the permanent magnet row (inner side) 3 is 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. 4 is a radial sectional view of the permanent magnet rotating electric machine according to the first 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. 5 is a magnetic flux density distribution diagram showing an example of the magnetic flux density distribution of the permanent magnet rotating electrical machine 1 according to the first embodiment of the present invention, and FIG. 6 is a permanent magnet rotation according to the first embodiment of the present invention. 4 is a magnetic force line distribution diagram showing an example of a magnetic force line distribution of the electric machine 1;

  As shown in FIG. 5, 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. 5 and 6, 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. When 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. 5 can obtain approximately twice as much magnetic flux as that 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 frame 6 between the substantially cylindrical permanent magnet rows 2 and 3. By providing this, the axial width of the permanent magnet rotating electrical machine 1 can be reduced. Further, by forming two substantially cylindrical permanent magnet rows arranged in a Halbach array, 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 electrical machine 1. .

  Next, the coil winding 4 and the stator frame 6 molded by the resin mold member 8 according to the first embodiment will be described. In the first embodiment, the coil winding 4 and the stator frame 6 are integrally molded by a resin mold member 8. The coil winding 4 is molded so as to cover the bottom surface in contact with the stator frame 6 and the radially inner and outer peripheral surfaces with a resin mold member 8. The coil winding 4 may be molded such that the surface facing the rotor 5 also covers the outer peripheral surface with the resin mold member 8.

  Next, the material of the resin mold member 8 will be described. The resin mold member 8 is an epoxy resin, a phenol resin, or a plastic resin. The resin mold member 8 may be a non-magnetic material having a high thermal conductivity. Therefore, the coil winding 4 and the stator frame 6 may be molded using an aluminum material instead of resin. As shown in FIG. 7 which is a radial sectional view of the permanent magnet rotating electrical machine 1, the resin mold member 8 is a non-magnetic material which is a composite material of the above-described resin and non-magnetic material powder which is a metal powder such as aluminum nitride. You may be comprised with the body material.

  Next, the operation of the permanent magnet rotating electrical machine 1 according to the first embodiment will be described. The first point is that the heat generated in the coil winding 4 can be efficiently cooled. Heat generated in the coil winding 4 during the operation of the permanent magnet rotating electrical machine 1 is conducted to the stator frame 6 through the resin mold member 8. In order to improve heat conduction, it is important to reduce the thermal resistance from the coil winding 4 to the mounting base and the stator frame 6.

  Here, as a comparative example, when the coil winding 4 and the stator frame 6 are bonded with an adhesive, an air layer is actually present even though they seem to be in contact with each other. Therefore, the air layer has a large thermal resistance, and it is difficult to transfer the heat of the coil winding 4 to the stator frame 6. The thermal conductivity of the air layer is 0.024, whereas the thermal conductivity of the epoxy resin that is an example of the resin mold member 8 according to the first embodiment is 0.21. Therefore, the thermal conductivity of the resin mold member 8 is as large as 10 times that of the air layer.

  Therefore, the heat of the coil winding 4 is efficiently conducted to the stator frame 6. The heat conducted to the stator frame 6 is radiated from the surface of the stator frame 6 to the atmosphere by natural convection. In addition to this, heat is also radiated from a member in contact with air by convection. Therefore, the heat generated in the coil winding 4 is efficiently cooled.

  The second point is to provide vibration damping of the stator frame 6. Since the permanent magnet rotating electrical machine 1 is not provided with an iron core, the ripple is small. Here, as a comparative example, when the stator frame 6 is formed of, for example, an aluminum material that is a non-magnetic material, the vibration attenuation rate of the stator frame 6 with respect to vibration that is transmitted as the permanent magnet rotating electrical machine 1 operates. Is 0.01%. On the other hand, the vibration attenuation factor of the stator frame 6 molded with the resin mold material 8 according to the first embodiment is 0.5%. Therefore, the vibration attenuation of the stator frame 6 molded with the resin mold material 8 is as large as about 50 times that of the stator frame 6 molded with a non-magnetic material. Accordingly, the stator frame 6 according to the first embodiment can be given vibration damping. The permanent magnet rotating electrical machine 1 has low vibration even during operation.

  The third point is to improve the productivity of the stator frame 6. Here, as a comparative example, when the stator frame 6 is molded from a non-magnetic material, the stator frame 6 is molded from a non-magnetic metal. In the productivity at the time of mass production of the permanent magnet rotating electrical machine 1, processing time is required and cost reduction is an issue. On the other hand, according to the resin mold member 8 according to the first embodiment, since there is no shaving, productivity in mass production is improved.

  Next, effects of the permanent magnet rotating electrical machine 1 according to the first embodiment will be described. According to the first embodiment, first, the heat generated by the coil winding 4 can be efficiently cooled, secondly, the stator frame 6 can be given vibration damping, and thirdly, the permanent magnet rotating electrical machine 1 Productivity during mass production can be improved. When the coil winding 4 is efficiently cooled, the current flowing through the coil winding 4 can be increased. Therefore, the output of the permanent magnet rotating electrical machine 1 can be further increased.

  In the first embodiment, the coil winding 4 and the stator frame 6 are molded by the resin molded member 8, but the frame of the rotor 5 may be molded by the resin molded member 8. In this case, first, the rotor 5 can be given vibration damping. Secondly, the productivity of the rotor 5 can be improved.

  Next, a second embodiment will be described. FIG. 8 is a cross-sectional view in the axial direction of the permanent magnet rotating electrical machine 1 according to the second embodiment. The rotor 5 is in a state removed for convenience of explanation. The same components as those described in the first embodiment shown in FIG.

  The coil winding 4 is molded so as to cover the bottom surface in contact with the stator frame 6 and the radially inner and outer peripheral surfaces with a resin mold member 8. The coil winding 4 may be molded such that the surface facing the rotor 5 also covers the outer peripheral surface with the resin mold member 8.

  The stator frame 6 is molded by a resin mold member 8 as a separate body from the coil winding 4. The stator frame 6 is used as a mold for the coil winding 4. By fitting the coil winding 4 into the stator frame 6, the coil winding 4 and the stator frame 6 are combined and integrated. In the coil winding 4, the shape of the coupling portion with the stator frame 6 is a rectangular convex shape in the axial cross section of the permanent magnet rotating electrical machine 1. The stator frame 6 has a rectangular concave shape in the axial cross section of the permanent magnet rotating electrical machine 1 in the shape of the coupling portion with the coil winding 4.

  The operations and effects in the second embodiment are the same as the operations and effects described in the first embodiment. In the second embodiment, the coil winding 4 and the stator frame 6 are both molded separately from the resin mold member 8. There are effects and effects. In the second embodiment, the coil winding 4 and the stator frame 6 are molded separately. Therefore, when the size of the permanent magnet rotating electrical machine 1 is large, the permanent magnet rotating electrical machine 1 is easier to create than molding the coil winding 4 and the stator frame 6 integrally with the resin mold member 8.

  Next, a third embodiment will be described. FIG. 9 is an axial sectional view of the permanent magnet rotating electrical machine 1 according to the third embodiment. The rotor 5 is in a state removed for convenience of explanation. The same components as those described in the first embodiment shown in FIG.

  In the third embodiment, the coil winding 4 is molded by the resin mold member 8 as in the second embodiment. The stator frame 6 is molded by a resin mold member 8 as a separate body from the coil winding 4. The stator frame 6 is used as a mold for the coil winding 4.

  In the coil winding 4, the shape of the coupling portion with the stator frame 6 is a substantially U-shaped convex shape having a round shape in the axial section of the permanent magnet rotating electrical machine 1. In the stator frame 6, the shape of the coupling portion with the coil winding 4 is a substantially U-shaped concave shape having a round shape in the axial section of the permanent magnet rotating electrical machine 1. The convex part of the coil winding 4 is just fitted into the concave part of the stator frame 6.

  The operations and effects in the third embodiment are the same as the operations and effects described in the first embodiment. Furthermore, according to the third embodiment, the resin mold member 8 is likely to permeate in productivity at the time of mass production of the permanent magnet rotating electrical machine 1, and the resin mold member 8 enters the joint portion of the stator frame 6. The conduction and the fixing strength of the coil winding 4 are improved. Therefore, according to the third embodiment, the strength can be increased even when the permanent magnet rotating electrical machine 1 is in operation.

  Next, a fourth embodiment will be described. FIG. 10 is an axial sectional view of the permanent magnet rotating electrical machine 1 according to the fourth embodiment. The rotor 5 is in a state removed for convenience of explanation. The same components as those described in the first embodiment shown in FIG.

  In the fourth embodiment, similarly to the second embodiment, the coil winding 4 is molded by the resin mold member 8. The stator frame 6 is molded by a resin mold member 8 as a separate body from the coil winding 4. The stator frame 6 is used as a mold for the coil winding 4.

  The coil winding 4 has a substantially trapezoidal convex shape with rounded corners in the axial cross section of the permanent magnet rotating electrical machine 1 in the shape of the coupling portion with the stator frame 6. The stator frame 6 has a substantially trapezoidal concave shape with rounded corners in the axial cross section of the permanent magnet rotating electrical machine 1 in the shape of the coupling portion with the coil winding 4. The convex part of the coil winding 4 is just fitted into the concave part of the stator frame 6.

  The operations and effects in the fourth embodiment are the same as the operations and effects described in the first embodiment. Furthermore, according to the third embodiment, the resin mold member 8 is likely to permeate in productivity at the time of mass production of the permanent magnet rotating electrical machine 1, and the resin mold member 8 enters the joint portion of the stator frame 6. The conduction and the fixing strength of the coil winding 4 are improved. Therefore, according to the fourth embodiment, the strength can be increased even when the permanent magnet rotating electrical machine 1 is in operation.

  Next, a fifth embodiment will be described. FIG. 11 is an axial sectional view of the permanent magnet rotating electrical machine 1 according to the fifth embodiment. The same components as those described in the first embodiment shown in FIG. Even if the coil winding 4 and the stator frame 6 are integrally molded by the resin mold member 8 as in the first embodiment, they are molded separately by the resin mold member 8 as in the second embodiment. It may be.

  A convex portion 61 having a rectangular cross section is provided on the outer edge of the stator frame 6. The convex portion 61 has a height that is, for example, the same position as the tip of the armature winding 4 in the axial direction. The convex portion 61 is provided on the stator frame 6 so that the cross section provided on the rotor 5 is positioned on the outer side in the radial direction with respect to the rectangular convex portion 51.

  The convex portion 61 provided on the stator frame 6 and the convex portion 51 provided on the rotor 5 are provided at a predetermined interval in the radial direction. The rotor 5 has a flat portion 53 extending outward in the radial direction from the convex portion 61 to which the permanent magnets 16 of the permanent magnet row (outside) 2 are attached. Therefore, the rotor 5 faces the convex portion 61 provided on the stator frame 6 in the axial direction. A convex portion 51 provided on the rotor 5 facing the stator frame 6 in the axial direction and a convex portion 61 provided on the stator 6 facing the rotor 5 in the axial direction are respectively spaced apart by a predetermined distance in the axial direction. They are spaced apart.

  In addition, fins 62 are provided on the convex portions 61 provided on the stator 6 so as to extend in the radial direction. Since the fins 62 are configured by a plurality of concave and convex shapes, the outer surface area of the stator frame 6 can be increased. The number and size of the unevenness of the fins 62 are variable depending on the size and application of the permanent magnet rotating electrical machine 1. The stator frame 6 is molded by a resin mold including the fins 62.

  The operations and effects in the fifth embodiment are the same as the operations and effects described in the first embodiment. Furthermore, according to the third embodiment, by providing the stator 6 with the fins 62 that are in direct contact with the outside air, the stator frame 6 can obtain a large heat radiation area for the heat generated in the armature winding 4. Therefore, the fins 62 molded by the resin mold 8 can enhance the heat dissipation action. According to the fifth embodiment, it is possible to provide the permanent magnet rotating electrical machine 1 that can cool the heat generation of the coil winding 4 more efficiently.

  Next, a sixth embodiment will be described. FIG. 12 is an axial sectional view of the permanent magnet rotating electrical machine 1 according to the sixth embodiment. The rotor 5 is in a state removed for convenience of explanation. FIG. 13 is a perspective view of the stator frame 6 provided with the armature winding 4 and the shaft 7 molded by the resin mold member 8 according to the sixth embodiment. The same components as those described in the first embodiment shown in FIG. Even if the coil winding 4 and the stator frame 6 are integrally molded by the resin mold member 8 as in the first embodiment, they are molded separately by the resin mold member 8 as in the second embodiment. It may be.

  The stator frame 6 is composed of a composite member of a resin mold member 8 and a nonmagnetic material member 81. For example, a plurality of non-magnetic material members 81 are provided inside the stator frame 6, radially about the position of the rotation axis of the shaft 7 and at equal intervals in the circumferential direction. The non-magnetic material member 81 has a plate shape or a rod shape.

  The operations and effects in the sixth embodiment are the same as the operations and effects described in the first embodiment. In the sixth embodiment, the strength of the stator frame 6 can be improved by the nonmagnetic material member 81. Therefore, since the non-magnetic material member 81 conducts heat throughout the stator frame 6, the stator frame 6 has improved cooling characteristics. The shape and number of the nonmagnetic material members 81 and the arrangement of the nonmagnetic material members 81 in the stator frame 6 can be arbitrarily changed.

  Next, a seventh embodiment will be described. FIG. 14 is an axial sectional view of the permanent magnet rotating electrical machine 1 according to the seventh embodiment. The rotor 5 is in a state removed for convenience of explanation. FIG. 15 is a perspective view of the stator frame 6 provided with the armature winding 4 and the shaft 7 molded with the resin mold member 8. The same components as those described in the first embodiment shown in FIG. Even if the coil winding 4 and the stator frame 6 are integrally molded by the resin mold member 8 as in the first embodiment, they are molded separately by the resin mold member 8 as in the second embodiment. It may be.

  The stator frame 6 is composed of a composite member of a resin mold member 8 and a nonmagnetic material member 81. For example, a plurality of nonmagnetic material members 81 are provided in the stator frame 6 at an arbitrary position around the rotation axis of the shaft 7 and at equal intervals in the circumferential direction. The nonmagnetic material member 81 is a plate material or a net material.

  The shape of the nonmagnetic material member 81 and the arrangement of the nonmagnetic material member 81 in the stator frame 6 can be arbitrarily changed. The operations and effects in the seventh embodiment are the same as the operations and effects described in the sixth embodiment.

  Next, an eighth embodiment will be described. FIG. 16 is an axial sectional view of the permanent magnet rotating electrical machine 1 according to the eighth embodiment. The rotor 5 is in a state removed for convenience of explanation. FIG. 17 is a perspective view of the stator frame 6 provided with the armature winding 4 and the shaft 7 molded by the resin mold member 8 according to the eighth embodiment. The same components as those described in the first embodiment shown in FIG. Even if the coil winding 4 and the stator frame 6 are integrally molded by the resin mold member 8 as in the first embodiment, they are molded separately by the resin mold member 8 as in the second embodiment. It may be.

  The stator frame 6 includes a resin mold member 8 and a non-magnetic heat pipe 9. The heat pipe 9 is provided in, for example, a concentric circle inside the stator frame 6 and centering on the position of the rotation axis of the shaft 7. The shape and number of the heat pipes 9 and the arrangement of the heat pipes 9 in the stator frame 6 can be arbitrarily changed.

  The operations and effects in the eighth embodiment are the same as the operations and effects described in the first embodiment. In the eighth embodiment, the strength of the stator frame 6 can be improved by the heat pipe 9. Further, the heat pipe 9 improves the cooling characteristics over the entire stator frame 6.

  The first to eighth embodiments described above can be appropriately combined. The present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Moreover, 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.

  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 frame, 7 ... Shaft, 8 ... Resin Mold member, 9 ... heat pipe, 16 ... permanent magnet, 62 ... fin, 81 ... non-magnetic material member.

Claims (12)

The rotor of a rotating electrical machine comprising a stator having a coil winding and a rotor having a permanent magnet arranged in a Halbach arrangement and supported rotatably with respect to the stator is ironless in the circumferential direction from the center of the rotating shaft. Two permanent magnet arrays arranged in Halbach array are provided, and the coil winding of the stator is provided between the permanent magnet arrays. In the stator, the direction of the magnetic poles of the inner permanent magnets in the row is the same direction for the direction of the magnetic pole in the radial direction, and the opposite direction for the direction of the magnetic pole in the circumferential direction.
A permanent magnet rotating electric machine, wherein the coil winding is molded with a non-magnetic molding member.   The permanent magnet rotating electric machine according to claim 1, wherein the stator frame is formed by the mold member.   2. The permanent magnet rotating electric machine according to claim 1, wherein the coil winding and the stator are integrated using the stator frame as a mold.   3. The permanent magnet rotating electric machine according to claim 2, wherein the outer peripheral surface of the stator frame is formed in an uneven shape.   The permanent magnet rotating electric machine according to claim 4, wherein the mold member is one of an epoxy resin, a phenol resin, a plastic resin, and an aluminum material.   The permanent magnet rotating electric machine according to any one of claims 1 to 5, wherein the frame of the stator is formed of a composite member of the mold member and a non-magnetic material member.   The permanent magnet rotating electric machine according to claim 6, wherein the non-magnetic material member is one of a plate material, a net material, and powder.   8. The permanent magnet rotating electrical machine according to claim 7, wherein the non-magnetic material member is disposed radially and circumferentially around the rotation axis.   The permanent magnet rotating electric machine according to claim 2, wherein the stator frame includes a heat pipe.   4. The permanent magnet rotating electric machine according to claim 3, wherein the stator frame and the coil winding have a substantially U-shaped coupling portion with a rounded concave portion.   The permanent magnet rotating electric machine according to claim 3, wherein the stator frame and the coil winding have a substantially trapezoidal shape with rounded corners.   The permanent magnet rotating electric machine according to any one of claims 1 to 11, wherein the frame of the rotor is molded with a mold member.

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