JP2008199833A - Rotating electrical machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a high-efficiency rotating electrical machine by suppressing the magnetic flux that flows in the direction of the axis of rotation. <P>SOLUTION: Permanent magnets 18 of a rotor have extended magnet portions 38, which extend outside both end portions of a rotor core 16 with regard to the direction of axis of rotation of the rotor. The magnetic flux 57, generated in the extended magnet portions 38, acts in such a way as to suppress the magnetic flux 56 which tends to enter the rotor core 16 and to leak outside, flowing through proximity portions 16a of the permanent magnets 18. Thus, the magnetic flux which flows through the proximity portions 16a of the permanent magnets 18 in the direction of axis of rotation can be reduced, and effective magnetic flux for the torque of the rotor can be increased. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention includes a stator in which a coil is disposed on a stator core, and a rotor in which a magnet is disposed on a rotor core, and the stator and the rotor are orthogonal to the rotation axis direction of the rotor. The present invention relates to a rotating electrical machine that is disposed so as to face in the radial direction.

  The related art of this type of rotating electrical machine is disclosed in Patent Document 1 below. In Patent Document 1, a permanent magnet rotor portion formed by fixing a plurality of permanent magnets on a core surface is disposed opposite to a position having the same length as the axial length of a stator core around which an armature coil is wound. . Furthermore, the reluctance rotor part which consists of a soft magnetic body and has magnetic saliency is arrange | positioned in the position facing the coil edge part of an armature coil. As the current flowing through the armature coil is increased, the torque ideally increases linearly, whereas the torque falls from the ideal straight line due to magnetic saturation of the core. In Patent Document 1, the torque drop when the coil current increases is compensated by the reluctance torque of the reluctance rotor portion.

  In addition, a rotating electrical machine according to Patent Documents 2 and 3 below is disclosed.

JP 2003-319583 A JP 2002-142422 A JP 2004-336831 A

  When the magnetic flux flowing through the iron core in the in-plane direction perpendicular to the rotation axis direction of the rotor is saturated, the magnetic flux also flows out in the rotation axis direction. And the magnetic flux which flows the edge part of a rotating shaft direction to the outer side of a rotating shaft direction leaks outside from the edge part of a rotating shaft direction. Since most of the magnetic flux that flows in the direction of the rotation axis and leaks to the outside is the magnetic flux that does not contribute to the torque, the torque acting on the rotor is reduced by the amount of the magnetic flux leaking to the outside. Further, when the magnetic flux flowing in the rotation axis direction fluctuates, an eddy current flows in an in-plane direction perpendicular to the rotation axis direction, and loss (iron loss) due to this eddy current occurs. In Patent Document 1, no measures are taken to suppress the magnetic flux flowing in the direction of the rotation axis in the core of the permanent magnet rotor portion, and it is difficult to increase the torque efficiently. Furthermore, the loss that occurs when eddy current flows in the in-plane direction also increases. As a result, the efficiency of the rotating electrical machine decreases.

  An object of this invention is to implement | achieve the high efficiency of a rotary electric machine by suppressing the magnetic flux which flows into a rotating shaft direction.

  The rotating electrical machine according to the present invention employs the following means in order to achieve the above-described object.

  A rotating electrical machine according to the present invention includes a stator in which a coil is disposed on a stator core, and a rotor in which a magnet is disposed on the rotor core, and the stator and the rotor rotate the rotor. The rotating electrical machine is disposed opposite to the radial direction orthogonal to the axial direction, and the rotor magnet has an extended magnet portion that projects outward from at least one end of the rotor core in the rotational axis direction. Is the gist.

  According to the present invention, the magnetic flux flowing in the direction of the rotation axis in the rotor core is suppressed by the magnetic flux generated by the extended magnet portion that projects outward from at least one end of the rotor core in the direction of the rotation axis of the rotor. be able to. As a result, high efficiency of the rotating electrical machine can be realized.

  In one aspect of the present invention, it is preferable that the rotor core has an extended core portion projecting outward from at least one end portion of the stator core in the rotation axis direction. According to this aspect, the magnetic flux flowing in the direction of the rotation axis in the stator core can be suppressed by the magnetic flux from the extended core portion.

  In one aspect of the present invention, it is preferable that the stator core has an extended core portion that projects outward from at least one end portion of the rotor core in the rotation axis direction. According to this aspect, the magnetic flux flowing in the direction of the rotation axis in the rotor core can be suppressed by the magnetic flux from the extended core portion.

  In one aspect of the present invention, it is preferable that a portion of the rotor magnet other than the extended magnet portion is embedded in the rotor core.

  The rotating electrical machine according to the present invention includes a stator in which a coil is disposed on a stator core, and a rotor in which a magnet is disposed on the rotor core, and the stator core and the rotor magnet are provided. Is a rotating electrical machine disposed in a radial direction orthogonal to the rotation axis direction of the rotor, and the magnet of the rotor is an extension projecting outward from at least one end of the stator core with respect to the rotation axis direction. The gist is to have a magnet part.

  According to the present invention, the magnetic flux flowing in the direction of the rotation axis in the stator core is suppressed by the magnetic flux generated by the extended magnet portion that protrudes outward from at least one end of the stator core with respect to the rotation axis direction of the rotor. be able to. As a result, high efficiency of the rotating electrical machine can be realized.

  The rotating electrical machine according to the present invention includes a stator in which a coil is disposed in a stator core, and a rotor in which a first magnet is disposed in the rotor core, the stator and the rotor, Is a rotating electrical machine disposed opposite to the rotor in the radial direction orthogonal to the rotation axis direction of the rotor, and is an end that rotates at the same speed as the rotor outside the at least one end of the rotor in the rotation axis direction. The rotor is arranged close to the rotor, and the end rotor is provided with a second magnet that generates a magnetic flux that repels the magnetic flux flowing in the direction of the rotation axis in the rotor core. The gist.

  According to the present invention, the second magnet disposed in the end rotor generates a magnetic flux that repels the magnetic flux flowing in the direction of the rotational axis of the rotor in the rotor core, so that the rotational axis in the rotor core. Magnetic flux flowing in the direction can be suppressed. As a result, high efficiency of the rotating electrical machine can be realized.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as embodiments) will be described with reference to the drawings.

“Embodiment 1”
1 and 2 are diagrams illustrating a schematic configuration of the rotating electrical machine according to the first embodiment of the present invention. FIG. 1 shows an outline of the internal configuration of the stator 12 and the rotor 14 as seen from a direction orthogonal to the axis 22, and FIG. 2 shows the stator 12 and the rotor 14 as seen from a direction parallel to the axis 22. A part of the internal configuration is shown. The rotating electrical machine according to the present embodiment includes a stator (stator) 12 fixed to a casing (not shown), a rotor (rotor) 14 that is disposed on the radially inner side of the stator 12 and is rotatable with respect to the stator 12, Is provided.

  The rotor 14 includes a rotor core (rotor core) 16 and a plurality of permanent magnets 18 disposed on the outer periphery of the rotor core 16. The plurality of permanent magnets 18 are arranged at intervals along the circumferential direction of the rotor 14. A shaft center 22 is disposed on the rotor 14 along its rotation center axis, and the shaft center 22 is rotatably supported by the casing. The rotor core 16 here is configured, for example, by laminating thin silicon steel plates (electromagnetic steel plates) in the rotation axis direction of the rotor 14 (the longitudinal direction of the axis 22, hereinafter simply referred to as the rotation axis direction). Can do.

  The stator 12 includes a stator core (stator core) 26 and a plurality of stator coils 28 disposed on the stator core 26. A plurality of teeth 30 protruding radially inward (rotor 14 side) are arranged on the stator core 26 at intervals along the circumferential direction of the stator 12. The teeth 30 are disposed. The stator core 26 here can also be configured, for example, by laminating electromagnetic steel sheets in the rotation axis direction.

  The inner peripheral portion (tooth tip portion 30a) of the stator core 26 and the permanent magnet 18 (outer peripheral portion of the rotor core 16) are disposed to face each other in the radial direction orthogonal to the rotational axis direction. The teeth 30 are sequentially magnetized by sequentially passing current through the stator coils 28, and a rotating magnetic field is formed. Then, the magnetic field flux of the permanent magnet 18 of the rotor 14 interacts with this rotating magnetic field, so that attraction and repulsion occurs, the rotor 14 rotates, and magnet torque can be obtained. 1 and 2, the rotor core 16 is also disposed on the surface of the permanent magnet 18 (outside of the permanent magnet 18 in the radial direction of the rotor 14), and most of the permanent magnet 18 is the rotor. The example embedded in the iron core 16 is shown. In this example, reluctance torque can be obtained in addition to magnet torque. FIG. 2 shows an example in which the permanent magnets 18 are arranged in a V shape, but the arrangement of the permanent magnets 18 is not limited to this example.

  In this embodiment, as shown in FIG. 1, each permanent magnet 18 extends from the rotor core 16 in the direction of the rotation axis, so that each permanent magnet 18 has both end portions of the rotor core 16 in the rotation axis direction. It has the extended magnet part 38 projected outward. Here, the magnetic pole surface of the extended magnet portion 38 is exposed to the outside of the rotor 14 without being covered with an iron core (ferromagnetic material). FIG. 1 shows an example in which portions other than the extension magnet portion 38 in each permanent magnet 18 are embedded in the rotor core 16, and the extension magnet portion 38 projects outward from both ends of the stator core 26 in the rotation axis direction. Show.

  As described above, with respect to the rotor core 16, for example, magnetic steel sheets are laminated in the direction of the rotation axis, thereby increasing the magnetic resistance in the direction of the rotation axis and making it difficult for the magnetic flux to flow in the direction of the rotation axis. However, when the magnetic flux flowing in the rotor core 16 in the in-plane direction of the plane perpendicular to the rotation axis direction is saturated, the magnetic flux flows out also in the rotation axis direction. Here, FIG. 3 shows a result obtained by analyzing (numerical calculation) a part where the inventor of the present application generates a large amount of magnetic flux flowing in the rotation axis direction. As shown in the analysis result of FIG. 3, a large amount of magnetic flux flowing in the direction of the rotation axis is generated in the vicinity of the permanent magnet 18 in the rotor core 16. Further, especially in the vicinity of the permanent magnet 18, a large amount of magnetic flux flowing in the direction of the rotation axis is generated at the end of the rotor core 16 in the direction of the rotation axis. In FIG. 3, a portion 52 that is an adjacent portion (V-shaped valley portion) of the N-pole magnet 18 n arranged in a V shape and is an end portion in the rotation axis direction extends from the rotor core 16 to the outside in the rotation axis direction. A part 54 from which a large amount of magnetic flux flows out, and a part 54 that is an adjacent part (V-shaped valley part) of the S-pole magnet 18s arranged in a V-shape and is an end part in the rotation axis direction, is externally provided to the rotor core 16. This is a portion where a large amount of magnetic flux enters in the direction of the rotation axis.

  In the configuration without the extension magnet portion 38, when the magnetic flux flowing through the rotor core 16 is saturated, the magnetic flux rotates at the proximity portion 16a on the radially outer side of the permanent magnet 18, for example, as shown in FIG. Flows out in the axial direction. And the magnetic flux 56 which flows the end part of a rotating shaft direction to the outer side of a rotating shaft among the proximity | contact parts 16a of the permanent magnet 18 leaks outside from the end part of a rotating shaft direction. Since most of the magnetic flux 56 that flows in the direction of the rotation axis and leaks to the outside is a magnetic flux that does not contribute to the torque, the torque acting on the rotor 14 is reduced by the amount of the magnetic flux leaking to the outside. In particular, when the torque of the rotor 14 is large, the magnetic flux flowing in the rotor core 16 is easily saturated, and the magnetic flux easily flows in the direction of the rotation axis. Further, when the magnetic flux flowing in the direction of the rotation axis fluctuates in the rotor core 16 (proximity portion 16a of the permanent magnet 18), for example, as shown in FIG. 5, an eddy current 34 flows in the in-plane direction perpendicular to the direction of the rotation axis. As a result, a loss (iron loss) due to the eddy current 34 occurs. In particular, when the rotor core 16 is configured by laminating electromagnetic steel plates in the rotation axis direction, the magnetic flux flowing in the rotation axis direction is low because the specific resistance (electric resistance) in the in-plane direction perpendicular to the rotation axis direction is low. The in-plane eddy current 34 generated with the fluctuations is also likely to increase.

  On the other hand, in this embodiment, the extension magnet part 38 protrudes outside the both ends of the rotor core 16 (proximity part 16a of the permanent magnet 18) in the rotation axis direction. As a result, as shown in FIG. 6, the magnetic flux 57 generated by the extension magnet portion 38 tends to enter the rotor core 16 (proximity portion 16 a of the permanent magnet 18). The magnetic flux 57 from the extended magnet portion 38 that is going to enter acts to suppress the magnetic flux 56 that flows in the direction of the rotation axis in the proximity portion 16a of the permanent magnet 18 and leaks to the outside. Therefore, the magnetic flux (magnetic flux that does not contribute to the torque) flowing in the rotation axis direction through the proximity portion 16a of the permanent magnet 18 can be reduced, and the effective magnetic flux to the torque of the rotor 14 can be increased. As a result, the torque of the rotor 14 can be increased efficiently. Furthermore, in the present embodiment, since the magnetic flux flowing in the direction of the rotation axis in the rotor core 16 (proximity portion 16a of the permanent magnet 18) can be reduced, the rotor core 16 rotates in accordance with the fluctuation of the magnetic flux. The eddy current 34 that flows in the in-plane direction of a plane perpendicular to the axial direction can be reduced. As a result, the loss due to the in-plane eddy current 34 can be reduced. Therefore, according to the present embodiment, the rotating electrical machine can be reduced in size and efficiency.

  In the above description of the first embodiment, it is assumed that the extended magnet portion 38 projects outward from both end portions of the rotor core 16 in the rotation axis direction. However, in this embodiment, even if the extension magnet portion 38 is configured to protrude outward from one end or the other end of the rotor core 16 with respect to the rotation axis direction, the inside of the rotor core 16 extends in the rotation axis direction. The flowing magnetic flux can be suppressed by the magnetic flux generated by the extension magnet portion 38.

  In the above description of the first embodiment, it is assumed that the rotor core 16 is also disposed on the surface (magnetic pole surface) of each permanent magnet 18. However, in the present embodiment, the surface of each permanent magnet 18 may be exposed on the surface (outer peripheral surface) of the rotor 14. In this case, each permanent magnet 18 has an extended magnet portion 38 that projects outward from both ends of the stator core 26 with respect to the rotation axis direction.

  Also for the stator core 26, for example, by laminating electromagnetic steel plates in the direction of the rotation axis, the magnetic resistance in the direction of the rotation axis is increased to make it difficult for the magnetic flux to flow in the direction of the rotation axis. However, in the configuration without the extension magnet portion 38, when the magnetic flux flowing in the stator core 26 in the in-plane direction perpendicular to the rotation axis direction is saturated, for example, as shown in FIG. The magnetic flux flows out in the direction of the rotation axis. And the magnetic flux 58 which flows the end part of a rotating shaft direction to the outer side of a rotating shaft direction also in the teeth front-end | tip part 30a leaks outside from the end part of a rotating shaft direction. As a result, the torque acting on the rotor 14 is reduced by the magnetic flux leaking to the outside. In particular, when the torque of the rotor 14 is large, the magnetic flux flowing in the stator core 26 is likely to be saturated. Furthermore, in the stator core 26 (tooth tip portion 30a), when the magnetic flux flowing in the rotation axis direction fluctuates, an eddy current flows in an in-plane direction perpendicular to the rotation axis direction, and loss due to this eddy current occurs. In particular, in the case where the stator core 26 is configured by laminating electromagnetic steel plates in the rotation axis direction, in-plane eddy currents generated with fluctuations in magnetic flux flowing in the rotation axis direction are likely to increase.

  On the other hand, in the present embodiment, the extension magnet portion 38 projects outward from both end portions of the stator core 26 (tooth tip portion 30a) in the rotation axis direction. As a result, as shown in FIG. 7, the magnetic flux 57 generated by the extension magnet portion 38 tends to enter the stator core 26 (tooth tip portion 30a). The magnetic flux 57 from the extended magnet portion 38 that is going to enter acts to suppress the magnetic flux 58 that flows through the teeth tip portion 30a in the direction of the rotation axis and leaks to the outside. Therefore, the magnetic flux that does not contribute to the torque flowing through the teeth tip 30a in the direction of the rotation axis can be reduced, and the effective magnetic flux to the torque of the rotor 14 can be increased. Therefore, the torque of the rotor 14 can be increased efficiently. Furthermore, in the present embodiment, since the magnetic flux flowing in the direction of the rotation axis in the stator core 26 (tooth tip 30a) can be reduced, the rotation of the stator core 26 in the direction of the rotation axis along with the fluctuation of the magnetic flux. Eddy currents flowing in the vertical in-plane direction can be reduced. Therefore, loss due to in-plane eddy current can be reduced. Even if the extension magnet portion 38 is configured to protrude outward from one end or the other end of the stator core 26 with respect to the rotation axis direction, the magnetic flux flowing in the stator core 26 in the rotation axis direction is used as the extension magnet. It can be suppressed by the magnetic flux generated by the portion 38. Even when the rotor core 16 is also disposed on the surface of each permanent magnet 18, the distance between the permanent magnet 18 (extension magnet portion 38) and the stator core 26 (tooth tip portion 30 a) is reduced. Thus, the magnetic flux flowing in the direction of the rotation axis in the stator core 26 can be suppressed by the magnetic flux generated by the extension magnet portion 38.

“Embodiment 2”
FIG. 8 is a diagram showing a schematic configuration of the rotating electrical machine according to the second embodiment of the present invention, and shows an outline of the internal configuration of the stator 12 and the rotor 14 as viewed from the direction orthogonal to the axis 22. In the following description of the second embodiment, the same or corresponding components as those in the first embodiment are denoted by the same reference numerals, and redundant descriptions are omitted.

  In the present embodiment, compared to the first embodiment, the rotor core 16 is extended more in the direction of the rotation axis than the stator core 26, so that the rotor core 16 has the stator core 26 with respect to the direction of the rotation axis. It has the extended iron core part 36 which protruded outside rather than both ends. The extended iron core portion 36 here is disposed at least in the proximity portion 16 a of the permanent magnet 18 in the rotor core 16. The extended magnet portion 38 projects outward from the extended iron core portion 36 with respect to the rotation axis direction.

  In the present embodiment, as shown in FIG. 9, the magnetic flux 59 flowing through the extension iron core portion 36 tends to enter the stator iron core 26 (tooth tip portion 30 a). The magnetic flux 59 from the extended iron core portion 36 that is going to enter acts to suppress the magnetic flux 58 that flows through the teeth tip portion 30a in the direction of the rotation axis and leaks to the outside. Therefore, the effective magnetic flux to the torque of the rotor 14 can be further increased, and the torque of the rotor 14 can be increased more efficiently. Further, the magnetic flux flowing in the direction of the rotation axis in the stator core 26 (tooth tip portion 30a) can be further reduced, so that in the plane perpendicular to the direction of the rotation axis in the stator core 26 due to the fluctuation of the magnetic flux. The eddy current flowing in the direction can be further reduced. Therefore, the loss due to the eddy current in the in-plane direction can be further reduced.

  In the above description of the second embodiment, it is assumed that the extended iron core portion 36 projects outward from both end portions of the stator iron core 26 in the rotation axis direction. However, in the present embodiment, even if the extended core portion 36 is configured to protrude outward from one end or the other end of the stator core 26 with respect to the rotation axis direction, the inside of the stator core 26 extends in the rotation axis direction. The flowing magnetic flux can be suppressed by the magnetic flux from the extended iron core portion 36.

“Embodiment 3”
FIG. 10 is a diagram showing a schematic configuration of the rotating electrical machine according to the third embodiment of the present invention, and shows an outline of the internal configuration of the stator 12 and the rotor 14 as seen from the direction orthogonal to the axis 22. In the following description of the third embodiment, the same or corresponding components as those of the first and second embodiments are denoted by the same reference numerals, and redundant description is omitted.

  In the present embodiment, compared with the first embodiment, the stator core 26 is extended in the direction of the rotation axis more than the rotor core 16, so that the stator core 26 has the rotor core 16 in the rotation axis direction. It has the extended iron core part 46 projected outside from both ends. Here, the extended iron core portion 46 is disposed at least at the tooth tip portion 30 a of the stator core 26.

  In the present embodiment, as shown in FIG. 11, the magnetic flux 60 flowing through the extended iron core portion 46 tends to enter the rotor iron core 16 (proximal portion 16 a of the permanent magnet 18). The magnetic flux 60 from the extended core portion 46 about to enter acts to suppress the magnetic flux 56 that flows in the direction of the rotation axis in the proximity portion 16a of the permanent magnet 18 and leaks to the outside. Therefore, the effective magnetic flux to the torque of the rotor 14 can be further increased, and the torque of the rotor 14 can be increased more efficiently. Since the magnetic flux flowing in the direction of the rotation axis in the rotor core 16 (proximity portion 16a of the permanent magnet 18) can be further reduced, the inside of the rotor core 16 is perpendicular to the direction of the rotation axis in accordance with the fluctuation of the magnetic flux. The eddy current flowing in the in-plane direction can be further reduced. Therefore, the loss due to the eddy current in the in-plane direction can be further reduced.

  In the above description of the third embodiment, it is assumed that the extended iron core portion 46 projects outward from both end portions of the rotor iron core 16 in the rotation axis direction. However, in this embodiment, even if it is configured such that the extended iron core portion 46 projects outward from one end or the other end of the rotor core 16 with respect to the rotation axis direction, the inside of the rotor core 16 extends in the rotation axis direction. The flowing magnetic flux can be suppressed by the magnetic flux from the extended iron core portion 46. Further, in the present embodiment, the extension magnet portion 38 may be configured to project outward from the extension iron core portion 46 (at least one end portion of the stator iron core 26) in the rotation axis direction.

“Embodiment 4”
FIG. 12 is a diagram showing a schematic configuration of the rotating electrical machine according to the fourth embodiment of the present invention, and shows an outline of the internal configuration of the stator 12 and the rotor 14 as seen from the direction orthogonal to the axis 22. In the following description of the fourth embodiment, the same or corresponding components as those in the first to third embodiments are denoted by the same reference numerals, and redundant description is omitted.

  In the present embodiment, a substantially disc-shaped end rotor 64 that rotates at the same speed as the rotor 14 is disposed in the vicinity of the rotor 14 outside both ends of the rotor 14 in the rotation axis direction. . A plurality of permanent magnets 68 are arranged at intervals along the circumferential direction of the end rotor 64 on the surface of the end rotor 64 facing the rotor 14. The surface (magnetic pole surface) of each permanent magnet 68 is exposed on the surface of the end rotor 64 (surface facing the rotor 14), and is arranged to face the permanent magnet 18 in the rotation axis direction and the end of the proximity portion 16a. Has been. About the permanent magnet 68 here, the magnetization direction is set so that the magnetic flux which repels the magnetic flux which flows in the inside of the rotor core 16 (adjacent part 16a of the permanent magnet 18) in a rotating shaft direction may be generated. For example, as shown in FIG. 13, when the facing surface (magnetic pole surface) of the permanent magnet 18 to the proximity portion 16a is an N pole, the permanent magnet 68 and the permanent magnet 68 facing the end of the proximity portion 16a. The surface (magnetic pole surface) is set to N pole. As a result, the permanent magnet 68 generates a magnetic flux 61 that repels the magnetic flux 56 that tends to leak from the permanent magnet 18 through the proximity portion 16a in the direction of the rotation axis toward the end rotor 64.

  In the present embodiment, as shown in FIG. 13, the magnetic flux 61 generated by the permanent magnet 68 of the end rotor 64 tends to enter the rotor core 16 (proximal portion 16 a of the permanent magnet 18). The magnetic flux 61 from the permanent magnet 68 to enter enters the proximity portion 16a of the permanent magnet 18 in the direction of the rotation axis and acts to repel and suppress the magnetic flux 56 that is about to leak to the outside (on the end rotor 64 side). To do. Therefore, the effective magnetic flux to the torque of the rotor 14 can be increased, and the torque of the rotor 14 can be increased efficiently. Since the magnetic flux flowing in the direction of the rotation axis in the rotor core 16 (proximity portion 16a of the permanent magnet 18) can be reduced, the rotor core 16 is perpendicular to the direction of the rotation axis as the magnetic flux fluctuates. Eddy currents flowing in the in-plane direction can be reduced. As a result, loss due to in-plane eddy currents can be reduced. Therefore, also in this embodiment, it is possible to achieve downsizing and high efficiency of the rotating electrical machine.

  In the above description of the fourth embodiment, it is assumed that the end rotor 64 is disposed outside the both end portions of the rotor 14 in the rotation axis direction. However, in the present embodiment, even if the end rotor 64 is disposed outside one end or the other end of the rotor 14 in the rotation axis direction, the magnetic flux flowing in the rotor core 16 in the rotation axis direction is transferred to the end rotor. It can be suppressed by the magnetic flux from 64 permanent magnets 68. In the present embodiment, the permanent magnet 68 of the end rotor 64 is further extended outward in the radial direction of the rotor 14, and the surface (magnetic pole surface) of the permanent magnet 68 is fixed to the stator core 26 (tooth tip portion) in the rotational axis direction. It can also be opposed to the end of 30a). As a result, the magnetic flux that flows through the stator core 26 (tooth tip 30a) in the direction of the rotation axis and leaks to the outside can be suppressed by the magnetic flux from the permanent magnet 68 of the end rotor 64.

  In the first to fourth embodiments described above, for the rotor core 16 and the stator core 26, powders that are coated with a film that does not conduct electricity are pressed on the surface of ferromagnetic fine particles such as iron. It can also be formed from a dust core material.

  As mentioned above, although the form for implementing this invention was demonstrated, this invention is not limited to such embodiment at all, and it can implement with a various form in the range which does not deviate from the summary of this invention. Of course.

It is a figure which shows schematic structure of the rotary electric machine which concerns on Embodiment 1 of this invention. It is a figure which shows schematic structure of the rotary electric machine which concerns on Embodiment 1 of this invention. It is a figure explaining the site | part where much magnetic flux which flows into the rotating shaft direction of a rotor generate | occur | produces. It is a figure explaining the magnetic flux which flows in the rotating shaft direction of a rotor, and leaks outside. It is a figure explaining the eddy current which flows into the in-plane direction perpendicular | vertical to the rotating shaft direction of a rotor. It is a figure explaining operation | movement of the rotary electric machine which concerns on Embodiment 1 of this invention. It is a figure explaining operation | movement of the rotary electric machine which concerns on Embodiment 1 of this invention. It is a figure which shows schematic structure of the rotary electric machine which concerns on Embodiment 2 of this invention. It is a figure explaining operation | movement of the rotary electric machine which concerns on Embodiment 2 of this invention. It is a figure which shows schematic structure of the rotary electric machine which concerns on Embodiment 3 of this invention. It is a figure explaining operation | movement of the rotary electric machine which concerns on Embodiment 3 of this invention. It is a figure which shows schematic structure of the rotary electric machine which concerns on Embodiment 4 of this invention. It is a figure explaining operation | movement of the rotary electric machine which concerns on Embodiment 4 of this invention.

Explanation of symbols

  12 Stator, 14 Rotor, 16 Rotor Core, 18, 68 Permanent Magnet, 22 Axis Center, 26 Stator Core, 28 Stator Coil, 30 Teeth, 30a Teeth Tip, 36, 46 Extension Iron Core, 38 Extension Magnet part, 64 end rotor.

Claims (6)

A stator having coils disposed on the stator core, and a rotor having magnets disposed on the rotor core, the stator and the rotor being arranged in a radial direction perpendicular to the rotation axis direction of the rotor. A rotating electric machine arranged oppositely,
The rotor magnet includes an extension magnet portion that projects outward from at least one end portion of the rotor core in the rotation axis direction. The rotating electrical machine according to claim 1,
The rotor core is a rotating electrical machine having an extended core portion projecting outward from at least one end portion of the stator core in the rotation axis direction. The rotating electrical machine according to claim 1,
The stator core has a rotating electrical machine having an extended core portion projecting outward from at least one end portion of the rotor core in the rotation axis direction. The rotating electrical machine according to any one of claims 1 to 3,
A rotating electrical machine in which a portion of the rotor magnet other than the extended magnet portion is embedded in the rotor core. The stator includes a stator having a coil disposed on the stator core and a rotor having a magnet disposed on the rotor core, and the stator core and the magnet of the rotor are orthogonal to the rotation axis direction of the rotor. A rotating electric machine arranged opposite to the radial direction,
The rotor magnet includes an extension magnet portion that projects outward from at least one end portion of the stator core in the rotation axis direction. The stator includes a stator having a coil disposed on the stator core, and a rotor having a first magnet disposed on the rotor core, and the stator and the rotor are orthogonal to the rotation axis direction of the rotor. A rotating electric machine arranged opposite to the radial direction,
An end rotor that rotates at the same speed as the rotor is disposed in the vicinity of the rotor outside the at least one end of the rotor with respect to the rotation axis direction,
The rotating electrical machine, wherein the end rotor is provided with a second magnet that generates a magnetic flux that repels the magnetic flux flowing in the direction of the rotation axis in the rotor core.

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