JP6275338B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine in which a magnet is provided on a rotor core of a rotor.

  In a rotating electrical machine for a vehicle, a claw pole type rotor in which two field cores each having a plurality of claw-shaped magnetic pole portions are combined may be used. In the claw pole type rotor, the claw-shaped magnetic pole portions of one field iron core and the claw-shaped magnetic pole portions of the other field iron core are alternately arranged in the circumferential direction, and the diameter of each claw-shaped magnetic pole portion is A field coil is arranged on the inner side in the direction. Further, in the claw pole type rotor, a permanent magnet is disposed between two claw-shaped magnetic pole portions adjacent to each other in order to suppress magnetic flux leakage between the claw-shaped magnetic pole portions. In the claw pole type rotor, the claw-shaped magnetic pole part may open radially outward due to the centrifugal force during rotation, and the permanent magnet may be scattered radially outward.

  Conventionally, in order to prevent deformation of the claw-shaped magnetic pole part and scattering of the permanent magnet, the protective cover is claw-shaped with the cylindrical protective cover surrounding the field core being in contact with the tip of the claw-shaped magnetic pole part. There has been proposed a vehicular generator rotor fixed to the tip of a magnetic pole by welding or the like (see, for example, Patent Document 1).

  Further, conventionally, in order to prevent deformation of the claw-shaped magnetic pole part and scattering of the permanent magnet, an automotive alternator in which the protective cover is fixed to the claw-shaped magnetic pole part by welding in a state where the protective cover is overlapped on the outer peripheral surface of the permanent magnet. A rotor has also been proposed (see, for example, Patent Document 2).

  Furthermore, conventionally, in order to prevent the movement of the permanent magnet relative to the field core, a rotating electric machine having a rotor provided with a magnet support ring that engages with the permanent magnet on the inner peripheral side of the permanent magnet has been proposed ( For example, see Patent Document 3).

JP-A-9-98556 JP 7-31854 A Japanese Patent No. 4697292

  In the conventional rotating electric machine shown in Patent Document 1, since the protective cover is in contact with both the N-pole claw-shaped magnetic pole and the S-pole claw-shaped magnetic pole, rotation is performed by energizing the field coil of the rotating electric machine. When the electric machine generates torque, a magnetic path that short-circuits from the tip of the S-pole claw-shaped magnetic pole to the protective cover and a magnetic path that short-circuits from the tip of the N-pole claw-shaped magnetic pole to the protective cover are generated. For this reason, the magnetic flux for generating torque by the rotating electrical machine is reduced, and there is a problem that the torque and output of the rotating electrical machine cannot be increased.

  In the conventional rotating electrical machine shown in Patent Document 2, a substantially cubic permanent magnet is arranged so as to contact the tip of the claw portion of the claw-shaped magnetic pole and have the same polarity as this claw portion, and also to the protective cover. When the protective cover is made of a magnetic material, the short-circuit magnetic path that connects the claw-shaped magnetic poles that are in contact with each other in the circumferential direction and the substantially cubic permanent magnet when the protective cover is made of a magnetic material. Occurs. This short-circuit magnetic path is a magnetic path perpendicular to the outer peripheral surface of the claw-shaped magnetic pole and the outer peripheral surface of the substantially cubic permanent magnet. The magnetic flux of this short-circuit magnetic path is a place where the side surface of the claw-shaped magnetic pole and the side surface of the substantially cubic permanent magnet are in contact with each other and the length of the short-circuit magnetic path is shortened, that is, the circumferential direction of the claw-shaped magnetic pole and the substantially permanent magnet It is easy to concentrate near the boundary. For this reason, the entire circumference of the protective cover cannot be magnetically saturated, and when the rotating electrical machine generates torque by energizing the field coil, the magnetic flux for generating the torque by the rotating electrical machine decreases, and There was a problem that the torque and output of the electric machine could not be increased.

  In the conventional rotating electric machine shown in Patent Document 3, when the rotor rotates in a no-load non-excited state in which the field coil is not energized, the magnetic flux from the permanent magnet is applied to the stator coil of the stator. By interlinking, an induced voltage is generated in the stator coil. Therefore, when the amount of the permanent magnet of the rotor is increased, the induced voltage generated in the stator coil also increases, and the stator coil voltage exceeds the bus voltage when the rotor rotates at high speed, and the state of the rotating electrical machine is intended. Otherwise, there is a risk of power generation. Thereby, there existed a problem that the battery etc. which were connected to the rotary electric machine will be in an overcharge state, for example.

  The present invention has been made to solve the above-described problems, and improves the torque when the field coil is energized and suppresses the induced voltage generated in the stator coil in a no-load non-excited state. It aims at obtaining the rotary electric machine which can do.

  A rotating electrical machine according to the present invention includes a stator and a rotor that is rotatably disposed inside the stator, and the stator includes a stator iron core and a stator coil provided in the stator iron core. And the rotor includes a rotor core having a first field core and a second field core, a field coil provided in the rotor core, and a circumferential direction of the rotor core. A plurality of magnets that are spaced apart from each other, a first outer peripheral member provided in the first field core portion, and a second outer peripheral member provided in the second field core portion The first field core portion has a plurality of first claw portions that are spaced apart from each other in the circumferential direction, and the second field core portion is mutually in the circumferential direction. It has a plurality of second claw parts arranged at intervals, and the first field core part and the second field core part are The first claw portion and the second claw portion are combined with each other in a state of being alternately arranged in the circumferential direction, and each magnet exists between the first claw portion and the second claw portion. Disposed in the magnet housing space and magnetized in a direction from the second claw portion toward the first claw portion, and the first outer peripheral member has a first annular body made of a magnetic material. In addition, the radially inner surface of the first annular body is in contact with at least one of the first claw portion and the magnet, and the second outer peripheral member has a second annular body made of a magnetic material. The surface on the radially inner side of the second annular body is in contact with at least one of the second claw portion and the magnet, and there is a gap in the axial direction between the first outer peripheral member and the second claw portion. And there is a gap in the axial direction between the second outer peripheral member and the first claw portion.

  According to the rotor of the rotating electrical machine according to the present invention, it is possible to improve the torque when the field coil is energized. Further, in the state where the field coil is not energized, that is, in the no-load no-excitation state, the amount of magnetic flux from the magnets linked to the stator side from the first and second claws is reduced. be able to. Thereby, the induced voltage which generate | occur | produces in a stator coil in a no-load no-excitation state can be suppressed.

It is a disassembled perspective view which shows the rotary electric machine by Embodiment 1 of this invention. It is a disassembled perspective view which shows the rotary electric machine by Embodiment 1 of this invention. It is a perspective view which shows the rotor of FIG. FIG. 4 is an exploded perspective view showing the rotor of FIG. 3. It is an expansion perspective view which shows the principal part of the rotor iron core containing the 1st nail | claw part and 2nd claw part of FIG. It is a side view which shows the rotor by which the magnetic pole is formed in each 1st nail | claw part and each 2nd claw part by supplying with electricity to the field coil of FIG. It is an expansion perspective view which shows the state by which the magnet is arrange | positioned in the magnet accommodation space of FIG. It is a principal part expansion perspective view which shows the state by which the 1st outer peripheral member and the 2nd outer peripheral member are provided in the rotor iron core of FIG. It is a principal part side view which shows the state by which the 1st outer peripheral member and the 2nd outer peripheral member are provided in the rotor iron core of FIG. It is a principal part expansion perspective view which shows the space area | region where the projection part of the 1st outer periphery member of FIG. 8 is arrange | positioned. It is a principal part side view which shows the other example of the rotor of the rotary electric machine by Embodiment 1 of this invention. It is a perspective view which shows the other example of the 1st outer peripheral member in the rotor of the rotary electric machine by Embodiment 1 of this invention. It is a perspective view which shows the other example of the 1st outer peripheral member in the rotor of the rotary electric machine by Embodiment 1 of this invention. It is a perspective view which shows the principal part of the rotor of the rotary electric machine by Embodiment 2 of this invention. It is a perspective view which shows the 1st outer peripheral member of FIG. It is a perspective view which shows the other example of the 1st outer peripheral member in the rotor of the rotary electric machine by Embodiment 2 of this invention. It is a perspective view which shows the principal part of the rotor of the rotary electric machine by Embodiment 3 of this invention. It is a perspective view which shows the 1st outer peripheral member of FIG. It is a perspective view which shows the other example of the 1st outer peripheral member in the rotor of the rotary electric machine by Embodiment 3 of this invention. It is a perspective view which shows the other example of the 1st outer peripheral member in the rotor of the rotary electric machine by Embodiment 3 of this invention.

Preferred embodiments of the present invention will be described below with reference to the drawings.
Embodiment 1 FIG.
1 and 2 are exploded perspective views showing a rotary electric machine according to Embodiment 1 of the present invention. In FIG. 1, illustration of the stator coil is omitted. In the figure, the rotating electrical machine includes a rotating shaft 100, a rotor 200 fixed to the rotating shaft 100, a cylindrical stator 300 that surrounds the rotor 200 via a gap in the radial direction, a rotating shaft 100, and a rotating shaft. And a frame 400 that supports the child 200 and the stator 300. The rotating shaft 100, the rotor 200, and the stator 300 are disposed coaxially with the axis of the rotating electrical machine.

  The frame 400 includes a front frame 401 and a rear frame 402 that are disposed to face each other in the axial direction of the rotation shaft 100. The front frame 401 and the rear frame 402 are fastened to each other by a plurality of bolts 403. In this example, the front frame 401 and the rear frame 402 are fastened to each other by four bolts 403. Further, the frame 400 covers the rotor 200 and the stator 300 by the front frame 401 and the rear frame 402.

  One end of the rotating shaft 100 passes through the front frame 401, and the other end of the rotating shaft 100 passes through the rear frame 402. The rotating shaft 100 is rotatably supported by two bearings (not shown) provided on the front frame 401 and the rear frame 402, respectively.

  The stator 300 includes a cylindrical stator core 301 and a stator coil 302 provided on the stator core 301. The stator 300 is held by the frame 400 in a state where the stator core 301 is fitted to the front frame 401 and the rear frame 402. Thereby, the stator 300 is fixed to the frame 400.

  The rotor 200 is disposed on the inner side of the stator 300 with a gap from the inner peripheral surface of the stator 300. Further, the rotor 200 can rotate integrally with the rotating shaft 100 about the axis of the rotating shaft 100 with respect to the stator 300.

  FIG. 3 is a perspective view showing the rotor 200 of FIG. FIG. 4 is an exploded perspective view showing the rotor 200 of FIG. As shown in FIG. 4, the rotor 200 includes a rotor core 3 including a first field core portion 1 and a second field core portion 2, and a field coil 4 provided in the rotor core 3. A plurality of magnets 5 arranged at intervals in the circumferential direction of the rotor core 3, a first outer peripheral member 6 provided in the first field core portion 1, and a second field And a second outer peripheral member 7 provided in the magnetic core 2. Although not shown, a fan made of sheet metal is fixed to both ends in the axial direction of the rotor core 3.

  The first field core portion 1 includes a first boss portion 11, a first yoke portion 12 provided on the outer periphery of the first boss portion 11, and an outer periphery of the first yoke portion 12. And a plurality of first claw portions 13 provided in the portion.

  The shape of the 1st boss | hub part 11 is a cylindrical shape centering on the axis line of the 1st field core part 1. As shown in FIG. In the center of the first boss portion 11, a through hole is provided along the axis of the first field core portion 1. The first field core portion 1 is fixed to the rotating shaft 100 in a state where the rotating shaft 100 is passed through the through hole of the first boss portion 11. In addition, a part of the first boss portion 11 protrudes from the first yoke portion 12 in the axial direction.

  The first claw portions 13 are arranged at intervals from each other in the circumferential direction of the first field core portion 1. In this example, each 1st nail | claw part 13 is arrange | positioned at equal intervals about the circumferential direction. In addition, a part of each first claw portion 13 protrudes from the first yoke portion 12 in the same direction as the first boss portion 11.

  A plurality of grooves 14 are provided on the outer peripheral portion of the first yoke portion 12 along the axial direction of the first field core portion 1. The grooves 14 are respectively provided at positions between the first claw portions 13 in the circumferential direction of the first field core portion 1.

  The second field core portion 2 includes a second boss portion 21, a second yoke portion 22 provided on the outer periphery of the second boss portion 21, and an outer periphery of the second yoke portion 22. And a plurality of second claw portions 23 provided in the portion.

  The shape of the 2nd boss | hub part 21 is a cylindrical shape centering on the axis line of the 2nd field iron core part 2. As shown in FIG. At the center of the second boss portion 21, a through hole is provided along the axis of the second field core portion 2. The second field core portion 2 is fixed to the rotating shaft 100 in a state where the rotating shaft 100 is passed through the through hole of the second boss portion 21. Further, a part of the second boss portion 21 protrudes from the second yoke portion 22 in the axial direction.

  The second claw portions 23 are arranged at intervals from each other in the circumferential direction of the second field core portion 2. In this example, each 2nd nail | claw part 23 is arrange | positioned at equal intervals about the circumferential direction. A part of each second claw portion 23 protrudes from the second yoke portion 22 in the same direction as the second boss portion 21.

  A plurality of grooves 24 are provided in the outer peripheral portion of the second yoke portion 22 along the axial direction of the second field core portion 2. The grooves 24 are respectively provided at positions between the second claw portions 23 in the circumferential direction of the second field core portion 2.

  The first field core portion 1 and the second field core portion 2 include a protruding portion of the first boss portion 11 from the first yoke portion 12 and a second portion from the second yoke portion 22. The protruding portion of the boss portion 21 is disposed in a state of abutting with each other in the axial direction of the rotating shaft 100. The first field core portion 1 and the second field core portion 2 are combined with each other in a state where the first claw portions 13 and the second claw portions 23 are alternately arranged in the circumferential direction. Yes. The first claw portion 13 and the second claw portion 23 are arranged at an interval from each other in the circumferential direction of the rotor core 3. In this example, the 1st nail | claw part 13 and the 2nd nail | claw part 23 are arrange | positioned alternately at equal intervals about the circumferential direction.

  Here, FIG. 5 is an enlarged perspective view showing a main part of the rotor core 3 including the first claw portion 13 and the second claw portion 23 of FIG. The first claw portion 13 and the second claw portion 23 are arranged in a state where the side surface of the first claw portion 13 and the side surface of the second claw portion 23 face each other in the circumferential direction of the rotor core 3. ing. The circumferential width and radial thickness of the first claw portion 13 are continuously reduced from the first yoke portion 12 toward the second yoke portion 22. The circumferential width and radial thickness of the second claw portion 23 are continuously reduced from the second yoke portion 22 toward the first yoke portion 12. Accordingly, the side surfaces of the first claw portion 13 and the second claw portion 23 are inclined in the circumferential direction of the rotor core 3 with respect to the axis of the rotor core 3.

  Between the first claw portion 13 and the second claw portion 23 that are adjacent to each other in the circumferential direction, a magnet accommodation space 31 exists. The magnet housing space 31 is a space sandwiched between the side surface of the first claw portion 13 and the side surface of the second claw portion 23. Two side surfaces sandwiching the magnet housing space 31 are parallel to each other. The magnet housing space 31 is formed along two side surfaces sandwiching the magnet housing space 31. Thereby, the longitudinal direction of the magnet housing space 31 is inclined in the circumferential direction of the rotor core 3 with respect to the axis of the rotor core 3.

  The end portion of the first claw portion 13 on the first yoke portion 12 side is used as the root portion of the first claw portion 13, and the end portion of the first claw portion 13 on the second yoke portion 22 side is the first portion. Assuming that the front end portion of one claw portion 13 is provided, a first outer peripheral groove 131 along the circumferential direction of the rotor core 3 is provided in the radially outer peripheral portion of the root portion of the first claw portion 13. In addition, a pair of first anti-locking portions 132 projecting from the first claw portion 13 to both sides in the circumferential direction of the rotor core 3 are provided on the radially outer peripheral portion other than the root portion of the first claw portion 13. It has been. The thickness in the radial direction of the pair of first detachment preventing portions 132 is thinner than the depth of the first outer peripheral groove 131. Therefore, the position of the inner surface in the radial direction of each first locking part 132 is present on the outer side in the radial direction than the position of the bottom surface in the depth direction of the first outer peripheral groove 131.

  The end portion of the second claw portion 23 on the second yoke portion 22 side is the root portion of the second claw portion 23, and the end portion of the second claw portion 23 on the first yoke portion 12 side is the second end portion. Assuming that the front end of the second claw portion 23 is provided, a second outer peripheral groove 231 along the circumferential direction of the rotor core 3 is provided in the radially outer peripheral portion of the root portion of the second claw portion 23. In addition, a pair of second detachment preventing portions 232 projecting from the second claw portion 23 to both sides in the circumferential direction of the rotor core 3 is provided on the radially outer peripheral portion other than the root portion of the second claw portion 23. It has been. The radial thickness of the pair of second locking portions 232 is thinner than the depth of the second outer circumferential groove 231. Therefore, the position of the inner surface in the radial direction of each second anti-locking portion 232 exists on the outer side in the radial direction than the position of the bottom surface in the depth direction of the second outer peripheral groove 231.

  As shown in FIG. 4, the field coil 4 includes first and second boss portions 11 and 21, first and second yoke portions 12 and 22, and first and second claw portions 13 and 23. It is arranged in the space surrounded by. The field coil 4 is provided on the rotor core 3 so as to surround the first and second boss portions 11 and 21 that are abutted with each other. A magnetic pole is formed in each first claw portion 13 and each second claw portion 23 by energizing the field coil 4.

  Each magnet 5 is accommodated in each magnet accommodation space 31. The magnet 5 is a rod-like plate-like permanent magnet disposed along the longitudinal direction of the magnet housing space 31. The magnet 5 is arranged such that the thickness direction of the magnet 5 coincides with the radial direction of the rotor core 3. At both ends in the longitudinal direction of each magnet housing space 31, end opening portions are formed through which the magnet 5 can be inserted into the magnet housing space 31. The magnet 5 is inserted into the magnet accommodation space 31 along the longitudinal direction of the magnet accommodation space 31 from any one end opening portion of the magnet accommodation space 31.

  FIG. 6 is a side view showing a rotor 200 in which magnetic poles are formed on the first claw portions 13 and the second claw portions 23 by energizing the field coil 4 of FIG. 4. In FIG. 6, the first outer peripheral member 6 and the second outer peripheral member 7 are omitted. In the rotor 200, when the field coil 4 is energized, the magnetic poles of the first claw portions 13 become S poles and the magnetic poles of the second claw portions 23 become N poles.

  The magnet 5 housed in each magnet housing space 31 is magnetized in a direction that suppresses leakage of magnetic flux from each of the magnetic poles of the first claw portion 13 and the magnetic poles of the second claw portion 23. Therefore, the magnet 5 is magnetized in the direction from the S pole of the first claw 13 to the N pole of the second claw 23. In this example, as indicated by an arrow in FIG. 6, the magnetizing direction of the magnet 5 is parallel to the radially outer surface of the magnet 5 and orthogonal to the longitudinal side of the magnet 5. .

  FIG. 7 is an enlarged perspective view showing a state in which the magnet 5 is arranged in the magnet housing space 31 of FIG. The length of the magnet 5 in the longitudinal direction is longer than the length of each of the first claw portion 13 and the second claw portion 23. On the side surfaces of both ends in the longitudinal direction of the magnet 5, inclined surfaces 51 that are flat surfaces are respectively provided. The inclined surface 51 is inclined with respect to the longitudinal direction of the magnet 5. Therefore, the inclined surface 51 is inclined with respect to the longitudinal direction of the magnet accommodating space 31 in a state where the magnet 5 is disposed in the magnet accommodating space 31. The two magnets 5 arranged on both sides of the common first claw portion 13 are in the space outside in the axial direction from the tip portion of the first claw portion 13 (that is, on the second yoke portion 22 side). The rotor core 3 is provided with the inclined surfaces 51 facing each other. Further, the two magnets 5 arranged on both sides of the common second claw portion 23 are on the outer side in the axial direction than the tip end portion of the second claw portion 23 (that is, on the first yoke portion 12 side). The rotor core 3 is provided with the inclined surfaces 51 facing each other in the space.

  The cross-sectional shape of the magnet 5 in a plane orthogonal to the longitudinal direction of the magnet 5 is a rectangle. Further, the shape of the magnet 5 when viewed along the thickness direction of the magnet 5 is a shape obtained by cutting off the acute corners at both ends of the parallelogram in the longitudinal direction with the inclined surfaces 51. Each inclined surface 51 is orthogonal to the short side of the parallelogram of the magnet 5 when the magnet 5 is viewed along the thickness direction. The inclination angle of the long side of the parallelogram of the magnet 5 with respect to each inclined surface 51 when the magnet 5 is viewed along the thickness direction is the inclination angle in the longitudinal direction of the magnet housing space 31 with respect to the axis of the rotor core 3. Are equal.

  The dimension in the width direction of the magnet 5, which is a direction orthogonal to both the longitudinal direction and the thickness direction of the magnet 5, is slightly smaller than the distance between the two side surfaces sandwiching the magnet housing space 31, and the magnet housing space. The distance is larger than the distance between the first locking part 132 and the second locking part 232 facing each other on the radially outer side of 31. In a state where the magnet 5 is housed in the magnet housing space 31, the magnet 5 is engaged with the first retaining portion 132 and the second retaining portion 232 so that the magnet 5 has a diameter from the inside of the magnet housing space 31. It is prevented from coming off to the outside in the direction.

  FIG. 8 is an essential part enlarged perspective view showing a state in which the first outer peripheral member 6 and the second outer peripheral member 7 are provided on the rotor core 3 of FIG. 7. Moreover, FIG. 9 is a principal part side view which shows the state in which the 1st outer peripheral member 6 and the 2nd outer peripheral member 7 are provided in the rotor core 3 of FIG. In FIG. 9, the display of the magnet 5 is omitted. The first outer peripheral member 6 includes an annular body 61 that is a first annular body, and a plurality of protrusions 62 that protrude radially inward from the annular body 61. The first outer peripheral member 6 is made of a magnetic material. As the magnetic material constituting the first outer peripheral member 6, for example, iron or the like is used.

  The annular body 61 collectively surrounds the first field core portion 1 and one end of each magnet 5 at the position of the root portion of each first claw portion 13. In this example, the shape of the annular body 61 is an annular shape. The annular body 61 has the width direction of the annular body 61 matched with the axial direction of the first field core portion 1, and the thickness direction of the annular body 61 matches the radial direction of the first field core portion 1. Has been placed. The annular body 61 is inserted into the first outer peripheral groove 131. The width of the annular body 61 is smaller than the width of the first outer peripheral groove 131. Thereby, the annular body 61 is disposed in the first outer circumferential groove 131 with a gap between the annular body 61 and the side surface of the first outer circumferential groove 131. Further, the annular body 61 is fitted into the outer peripheral portion of the first field core 1 by press fitting. Thereby, a tensile stress is generated in the annular body 61 in the circumferential direction of the annular body 61. Further, a gap L exists between the end face of the tip of the second claw 23 and the annular body 61 as shown in FIG. Further, the radially inner surface of the annular body 61 is in contact with the first field core 1 and the magnet 5.

  Each protrusion 62 protrudes radially inward from a portion of the annular body 61 in the width direction that is far from the tip of the second claw 23. Thereby, each protrusion 62 is positioned on the outer side in the axial direction than the magnet 5. In addition, each protrusion 62 is disposed in a space between each root portion of each first claw portion 13. Furthermore, a common protrusion 62 faces the one end of each of the two magnets 5 sandwiching the common second claw 23 in the axial direction of the rotor core 3.

  FIG. 10 is an enlarged perspective view of a main part showing a space region in which the protrusions 62 of the first outer peripheral member 6 of FIG. 8 are arranged. A virtual plane that includes one end surface in the width direction of the annular body 61 and is orthogonal to the axis of the rotor core 3 is defined as a first virtual plane 201, and a virtual plane that includes the other end surface in the width direction of the annular body 61 and is orthogonal to the axis of the rotor core 3. When the plane is the second virtual plane 202 and the virtual space obtained by extending the cross section of the magnet 5 along the longitudinal direction of the magnet housing space 31 is the magnet insertion virtual space 203, at least a part of the protrusion 62 is a magnet insertion virtual. Of the space 203, the space 203 is disposed between the first virtual plane 201 and the second virtual plane 202. Thereby, at least a part of the protrusion 62 overlaps the region of the magnet 5 when the rotor core 3 is viewed along the longitudinal direction of the magnet housing space 31. In this example, the protrusion 62 is disposed away from the magnet 5 in the axial direction, and when the magnet 5 is displaced toward the protrusion 62 in the longitudinal direction of the magnet housing space 31, the magnet 5 interferes with the protrusion 62. It is like that.

  As shown in FIG. 8, the second outer peripheral member 7 includes an annular body 71 that is a second annular body, and a plurality of protrusions 72 that protrude radially inward from the annular body 71. The second outer peripheral member 7 is made of a magnetic material. As a magnetic material constituting the second outer peripheral member 7, for example, iron or the like is used.

  The annular body 71 collectively surrounds the second field core portion 2 and the other end portions of the magnets 5 at the position of the root portion of each second claw portion 23. In this example, the shape of the annular body 71 is an annular shape. The annular body 71 has the width direction of the annular body 71 matched with the axial direction of the second field core part 2 and the thickness direction of the annular body 71 matched with the radial direction of the second field core part 2. Has been placed. The annular body 71 is inserted into the second outer peripheral groove 231. The width of the annular body 71 is smaller than the width of the second outer peripheral groove 231. Thereby, the annular body 71 is disposed in the second outer circumferential groove 231 with a gap between the annular body 71 and the side surface of the second outer circumferential groove 231. Further, the annular body 71 is fitted into the outer peripheral portion of the second field core portion 2 by press fitting. Thereby, a tensile stress is generated in the annular body 71 in the circumferential direction of the annular body 71. Furthermore, a gap L exists between the end face of the tip of the first claw 13 and the annular body 71, as shown in FIG. Further, the radially inner surface of the annular body 71 is in contact with the second field core 2 and the magnet 5.

  Each protrusion 72 protrudes radially inward from a portion of the annular body 71 at both ends in the width direction farther from the tip of the first claw portion 13. Thereby, each protrusion 72 is positioned on the outer side in the axial direction than the magnet 5. In addition, each protrusion 72 is disposed in a space between each root portion of each second claw portion 23. Furthermore, a common protrusion 72 faces the other end of each of the two magnets 5 sandwiching the common first claw 13 in the direction along the axis of the rotor core 3.

  A virtual plane that includes one end surface in the width direction of the annular body 71 and is orthogonal to the axis of the rotor core 3 is defined as a third virtual plane, and includes the other end surface in the width direction of the annular body 71 and is orthogonal to the axis of the rotor core 3. When the virtual plane is the fourth virtual plane and the virtual space obtained by extending the cross section of the magnet 5 along the longitudinal direction of the magnet housing space 31 is the magnet insertion virtual space, at least a part of the protrusion 72 is a magnet insertion virtual space. Among these, it arrange | positions in the space area | region restrict | limited between the 3rd virtual plane and the 4th virtual plane. Thereby, at least a part of the protrusion 72 overlaps the region of the magnet 5 when the rotor core 3 is viewed along the longitudinal direction of the magnet housing space 31. In this example, the protrusion 72 is disposed away from the magnet 5 in the axial direction, and when the magnet 5 is displaced toward the protrusion 72 in the longitudinal direction of the magnet housing space 31, the magnet 5 interferes with the protrusion 72. It is like that. In a state where the magnet 5 is housed in the magnet housing space 31, the magnet 5 interferes with the protrusions 62 and 72, thereby preventing the magnet 5 from coming out of the magnet housing space 31 outward in the axial direction.

  Next, a method for manufacturing the rotor 200 will be described. First, the first claw portions 13 and the second claw portions 23 are alternately arranged in the circumferential direction while the field coil 4 is fitted to the outer peripheral portions of the first boss portion 11 and the second boss portion 21. As described above, the rotor core 3 is configured by combining the first field core 1 and the second field core 2. At this time, the first shaft core portion 1 and the second field core portion 2 are fixed to the rotation shaft 100 by passing the rotation shaft 100 through the first boss portion 11 and the second boss portion 21. Thereby, the magnet accommodation space 31 is formed between each 1st nail | claw part 13 and each 2nd nail | claw part 23, respectively.

  Thereafter, the magnet 5 is inserted into each magnet housing space 31. At this time, the longitudinal direction of the magnet 5 is made to coincide with the longitudinal direction of the magnet housing space 31, and the magnet 5 is placed on two side surfaces sandwiching the magnet housing space 31 from the end opening portion located at the longitudinal end of the magnet housing space 31. The magnet 5 is inserted into the magnet housing space 31 along the longitudinal direction of the magnet housing space 31. Since the inclined surfaces 51 that are inclined with respect to the longitudinal direction of the magnets 5 are provided at both longitudinal ends of the respective magnets 5, also when the magnets 5 are inserted into the two magnet housing spaces 31 adjacent to each other. Interference between the magnets 5 is avoided.

  Thereafter, the annular body 61 of the first outer peripheral member 6 is pressed into the first field core portion 1 from the outside in the axial direction of the rotor core 3, and the second field magnet from the outside in the axial direction of the rotor core 3. The annular body 71 of the second outer peripheral member 7 is press-fitted into the iron core portion 2.

  When the first outer peripheral member 6 is attached to the first field core 1, the annular body 61 is placed in the first while disposing the protrusions 62 in the spaces between the respective roots of the first claws 13. The outer peripheral groove 131 is fitted. Thereby, the projection part 62 common to the two magnets 5 located on both sides of the common second claw part 23 opposes in the axial direction. Further, when attaching the second outer peripheral member 7 to the second field core 2, the annular body 71 is placed while arranging the protrusions 72 in the spaces between the respective base portions of the respective second claw portions 23. It fits in the second outer peripheral groove 231. Thereby, the protrusion part 72 common to the two magnets 5 located on both sides of the common first claw part 13 opposes in the axial direction.

  Then, the rotor 200 is completed by fixing a fan to the both ends of the rotor core 3 in the axial direction.

  Next, the operation of the rotating electrical machine will be described. When the field coil 4 is energized, different magnetic poles are generated in the first claw portion 13 and the second claw portion 23. In this state, when an alternating current is supplied to the stator coil 302 of the stator 300, a rotating magnetic field is generated in the stator 300, and the rotor 200 rotates integrally with the rotating shaft 100.

  When the rotor 200 rotates at a high speed, the first claw portion 13 and the second claw portion 23 receive a centrifugal force outward in the radial direction, so that each first claw portion 13 and each second claw portion 23. Becomes easier to open radially outward. When the first claw portions 13 and the second claw portions 23 are deformed in the direction of opening radially outward, the magnets 5 are also displaced radially outward. However, in the rotor 200 in the present embodiment, the annular body 61 of the first outer circumferential member 6 surrounds the first field core 1 and each magnet 5, and the annular body 71 of the second outer circumferential member 7 is Since the second field core 2 and the magnets 5 are surrounded, the first claw portions 13 and the second claw portions 23 are deformed radially outward and the magnets 5 radially outward. Can be suppressed by the annular bodies 61 and 71.

  Further, when the rotor 200 rotates at a high speed, for example, when each first claw portion 13 and each second claw portion 23 are deformed by centrifugal force, the first claw portion 13 and the second claw portion. The force for holding the magnet 5 with respect to the magnet 23 is weakened, and the magnet 5 is likely to move in the longitudinal direction of the magnet housing space 31. However, in the present embodiment, the magnet 5 is disposed in the magnet housing space 31 existing between the first claw portion 13 and the second claw portion 23, and the rotor is disposed along the longitudinal direction of the magnet housing space 31. When the iron core 3 is viewed, at least a part of the protrusions 62 of the first outer peripheral member 6 and at least a part of the protrusions 72 of the second outer peripheral member 7 overlap the region of the magnet 5. Can move the protrusion 62 or the protrusion 72 to interfere with the magnet 5 even if it moves in the longitudinal direction of the magnet housing space 31. Thereby, the magnet 5 can be made difficult to come off from the rotor core 3.

  In addition, when the field coil 4 is energized, the electromagnetic excitation force generated by the linkage of the magnetic flux between the rotor 200 and the stator 300 fluctuates, and the first claw portions 13 and the first claw portions 13 are changed. The two claw portions 23 are likely to vibrate. Further, when the first claw portions 13 and the second claw portions 23 vibrate, noise is generated from the rotor 200. However, in the present embodiment, the protrusion 62 protrudes radially inward from the annular body 61 in the first outer peripheral member 6, and the protrusion 72 protrudes radially inward from the annular body 71 in the second outer peripheral member 7. Therefore, the second moment of section of each of the first outer peripheral member 6 and the second outer peripheral member 7 can be increased, and each of the first outer peripheral member 6 and the second outer peripheral member 7 in the radial direction can be increased. Deformation can be suppressed. Thereby, each vibration of each 1st nail | claw part 13 and each 2nd nail | claw part 23 can be suppressed, and the noise of the rotor 200 can be suppressed.

  Further, since the protrusion 62 and the protrusion 72 are positioned on the outer side in the axial direction than the magnet 5, the protrusion 62 and the protrusion 72 can be easily opposed to the magnet 5 in the axial direction. It is possible to more reliably and easily suppress the 5 from coming out of the magnet housing space 31 in the longitudinal direction of the magnet housing space 31.

  Further, when the first claw portion 13 and the second claw portion 23 are deformed radially outward by the centrifugal force generated by the rotation of the rotor 200, the respective front end portions of the first claw portion 13 and the second claw portion 23 are used. May interfere with the first outer peripheral member 6 and the second outer peripheral member 7, and the first outer peripheral member 6 and the second outer peripheral member 7 may be damaged. However, in the present embodiment, a gap L exists in the axial direction between the first outer peripheral member 6 and the second claw portion 23, and the gap between the second outer peripheral member 7 and the first claw portion 13 is present. Since there is a gap L in the axial direction, the front end portions of the first claw portion 13 and the second claw portion 23 do not interfere with the first outer peripheral member 6 and the second outer peripheral member 7. Each of the first claw portion 13 and the second claw portion 23 can be deformed radially outward. Thereby, damage to the first outer peripheral member 6 and the second outer peripheral member 7 can be prevented.

  In a state where the first outer peripheral member 6 is in contact with the end surface of the tip portion of the second claw portion 23 and the second outer peripheral member 7 is in contact with the end surface of the tip portion of the first claw portion 13, When the outer peripheral member 6 is fixed to the second claw portion 23 by welding or the like and the second outer peripheral member 7 is fixed to the first claw portion 13 by welding or the like, there is no gap L, so the first The deformation of the second claw portions 13 and 23 is suppressed by the first and second outer circumferential members 6 and 7, and the first and second outer circumferential members 6 and 7 are the first and second claw portions 13. , 23 is deformed along with the deformation. At this time, while the magnet 5 is supported by the first and second outer peripheral members 6 and 7, the contact area between the magnet 5 and any one of the first and second outer peripheral members 6 and 7 decreases, and the magnet There is a problem that the cracks or chips of the magnet 5 occur due to an increase in the stress generated in the magnet 5. On the other hand, in the present embodiment, since the gap L exists, the first and second outer peripheral members 6 and 7 do not generate reaction force due to the centrifugal force caused by the rotation of the rotor 200. The first and second claw portions 13 and 23 are deformed radially outward. At this time, centrifugal force similarly acts on the magnet 5, but the magnet 5 is supported by the first and second outer peripheral members 6 and 7 so as not to move radially outward. Therefore, in this Embodiment, the increase in the stress which generate | occur | produces in the magnet 5 can be suppressed, and generation | occurrence | production of the crack of the magnet 5 and a chip | tip can be prevented.

  In addition, since tensile stress is generated in the circumferential direction in each of the annular bodies 61 and 71 of the first outer peripheral member 6 and the second outer peripheral member 7, the first outer peripheral member 6 and the second outer peripheral member 7. Can be made difficult to be displaced in the axial direction with respect to the rotor core 3. Thereby, the suppression effect of each deformation | transformation of the 1st nail | claw part 13 and the 2nd nail | claw part 23 can be maintained for a long period of time.

  Further, when the field coil 4 is not energized, that is, when the rotor 200 is unloaded and unexcited, the magnetic flux from the magnet 5 is linked to the stator core 301 and the stator coil 302. When the rotor 200 is rotated, an induced voltage is generated in the stator coil 302. When the rotor 200 rotates at high speed, the induced voltage generated in the stator coil 302 may increase. However, in the present embodiment, the first outer peripheral member 6 is arranged so as to connect the first claw portions 13 adjacent to each other, and the second claw portions 23 adjacent to each other are connected to each other. Since the first outer peripheral member 6 and the second outer peripheral member 7 are made of a magnetic material, the magnetic path of the magnetic flux from the magnet 5 is changed to each first claw portion. 13 and a closed magnetic path that connects the inclined surface 51 that is the circumferential side surface of the magnet 5 with the first outer peripheral member 6, and the inclined surface 51 that is the circumferential side surface of each second claw portion 23 and the magnet 5. The magnetic flux from the magnet 5 interlinked from the first claw part 13 and the second claw part 23 to the stator 300 side can be formed as a closed magnetic path that connects between the first claw part 13 and the second claw part 23. Can be reduced. Thereby, the induced voltage generated in the stator coil 302 can be suppressed, and the induced voltage in the stator coil 302 should not exceed the bus voltage when the rotor 200 is rotating at high speed. Can do.

  On the other hand, when the rotating electrical machine functions as a motor and generates torque, the rotor core 3 is excited by energizing the field coil 4 in addition to generating magnetic flux from the magnet 5. Thereby, the magnetic flux from the magnet 5 and the magnetic flux generated by energizing the field coil 4 are linked to the first outer peripheral member 6 and the second outer peripheral member 7, and the first outer peripheral member 6 and the first outer peripheral member 6 are connected. 2 outer peripheral member 7 will be in a magnetic saturation state. When the first outer peripheral member 6 and the second outer peripheral member 7 are in a magnetic saturation state, the magnetic flux is linked from the first outer peripheral member 6 and the second outer peripheral member 7 to the stator 300 side.

  For this reason, the magnetic flux from the rotor 200 is linked to the stator 300 side when the torque of the rotating electrical machine is generated, while suppressing the induced voltage in the stator coil 302 when the rotor 200 is unloaded and unexcited. The output of the rotating electrical machine can be increased. Moreover, the closed magnetic path which connects between each 1st nail | claw part 13 and the inclined surface 51 which is the circumferential direction side surface of the magnet 5 with the 1st outer peripheral member 6, and each 2nd nail | claw part 23 and the magnet 5 of FIG. The closed magnetic path that connects the inclined surface 51 that is the circumferential side surface with the second outer peripheral member 7 occupies substantially the entire circumference of the first outer peripheral member 6 and the second outer peripheral member 7. For this reason, almost the entire circumference of the first outer peripheral member 6 and the second outer peripheral member 7 can be magnetically saturated, and the output of the rotating electrical machine can be increased.

  In addition, as described above, there is a gap L between the end surface of the distal end portion of the second claw portion 23 and the annular body 61 and between the end surface of the distal end portion of the first claw portion 13 and the annular body 71. Each exists. When the rotating electrical machine generates torque, a magnetic path that is short-circuited from the distal end portion of the second claw portion 23 to the annular body 61 and a magnetic path that is short-circuited from the distal end portion of the first claw portion 13 to the annular body 71 are generated. To do. At this time, since the gap L exists and the relative permeability of the gap L can be regarded as 1, the magnetic resistance in the short-circuit magnetic path can be increased compared to the case where the gap L does not exist. Therefore, when the rotating electrical machine generates torque, the output of the rotating electrical machine can be further increased.

  In the above example, the annular first outer peripheral member 6 is attached to the first field core 1 by press fitting, and the annular second outer peripheral member 7 is pressed into the second field core 2. Although attached, it is not limited to this. For example, the annular first outer peripheral member 6 may be formed by connecting both end portions of a strip wound around the first field core portion 1 by welding, or the second field core portion 2 may be formed. Alternatively, the annular second outer peripheral member 7 may be formed by connecting both end portions of the belt-shaped plate wound around to each other by welding. The annular first outer peripheral member 6 fitted to the first field core 1 may be fixed to the first field core 1 with, for example, a screw or an adhesive, or the second field You may fix the cyclic | annular 2nd outer peripheral member 7 fitted to the iron core part 2 to the 2nd field iron core part 2 with a screw or an adhesive agent etc., for example.

  When the strip-shaped plate is wound around the first field core portion 1 to form the annular first outer peripheral member 6, the strip-shaped plate is wound around the first field core portion 1 while being pulled. If both ends of the belt-like plate are connected by welding in a state where tensile stress is generated, tensile stress can be generated in the first outer peripheral member 6 in the circumferential direction. Further, in the case of forming the annular second outer peripheral member 7 by winding the belt-like plate around the second field core portion 2, the belt-like plate is wound around the second field core portion 2 while pulling the belt-like plate. When both ends of the belt-like plate are connected by welding in a state where tensile stress is generated on the plate, tensile stress can be generated in the second outer peripheral member 7 in the circumferential direction. Accordingly, the first outer peripheral member 6 and the second outer peripheral member 7 can be made difficult to shift in the axial direction with respect to the first field core portion 1 and the second field core portion 2, and the first The holding effect of the first claw portion 13 and the magnet 5 by the outer peripheral member 6 and the holding effect of the second claw portion 23 and the magnet 5 by the second outer peripheral member 7 can be enhanced.

  Further, the first outer peripheral member 6 and the second outer peripheral member 7 are connected to the first field core 1 and the second outer peripheral member 7 in a state where tensile stress is generated in the first outer peripheral member 6 and the second outer peripheral member 7. You may fix to the field iron core part 2 with a screw or an adhesive agent. In this way, the first outer peripheral member 6 and the second outer peripheral member 7 can be made more difficult to displace with respect to the rotor core 3.

  Further, the shape of each of the protrusions 62 of the first outer peripheral member 6 and the protrusions 72 of the second outer peripheral member 7 need not be one type, and the protrusions 62 and 72 having different shapes may be combined. Good. Further, the shape, quantity, and position of the protrusions 62 and 72 are not limited to the above example.

  In the above example, a gap L exists in the axial direction between the annular body 61 of the first outer peripheral member 6 and the second claw portion 23, and the annular body 71 of the second outer peripheral member 7 and the first A gap L exists in the axial direction between the claw portion 13 and the annular body 61 of the first outer peripheral member 6 on the end surface of the tip portion of the second claw portion 23 as shown in FIG. The annular body 71 of the second outer peripheral member 7 may be in contact with the end face of the tip portion of the first claw portion 13. Even if it does in this way, while being able to make it difficult to remove the magnet 5 from the rotor core 3, the vibration and noise of the rotor 200 can be suppressed.

  In the above example, the protrusions 62 common to the two magnets 5 arranged on both sides of the second claw portion 23 face each other in the axial direction and are arranged on both sides of the first claw portion 13. Although the protrusions 72 common to the two magnets 5 face each other in the axial direction, when the rotor core 3 is viewed along the longitudinal direction of the magnet housing space 31, at least a part of the protrusions 62 and the protrusions As long as at least a part of 72 overlaps with the area of the magnet 5, the number and positions of the protrusions 62 and the protrusions 72 are not limited thereto. For example, as shown in FIG. 12, the number of protrusions 62 of the first outer peripheral member 6 may be the same as the number of each magnet 5, and the protrusions 62 may be individually opposed to each magnet 5 in the axial direction. For example, as shown in FIG. 13, the protrusion 62 of the first outer peripheral member 6 may be provided at the center in the width direction of the annular body 61. Although not shown, the protrusion 72 of the second outer peripheral member 7 may be configured in the same manner as the protrusion 62 of the first outer peripheral member 6.

Embodiment 2. FIG.
FIG. 14 is a perspective view showing a main part of a rotor in a rotary electric machine according to Embodiment 2 of the present invention. FIG. 15 is a perspective view showing the first outer peripheral member 6 of FIG. The first outer peripheral member 6 includes an annular body 61 and a plurality of protrusions 63 that protrude radially inward from the annular body 61. The second outer peripheral member 7 has an annular body 71 and a plurality of protrusions 73 that protrude radially inward from the annular body 71.

  The annular body 61 of the first outer peripheral member 6 is attached to the first outer peripheral groove 131 provided in the first field core part 1 by press fitting. The annular body 71 of the second outer peripheral member 7 is attached to the second outer peripheral groove 231 provided in the second field core part 2 by press fitting. Thereby, tensile stress is generated in the annular bodies 61 and 71 in the circumferential direction.

  The protrusions 63 are arranged at intervals from each other in accordance with the positions of the second claw portions 23 in the circumferential direction. In addition, each protrusion 63 is disposed on the outer side in the axial direction than the tip of the second claw 23. In this example, a gap exists in the axial direction between the protrusion 63 and the second claw 23. Furthermore, at least a part of the protrusion 63 is disposed in the space region 204 shown in FIG. Thereby, at least a part of the protrusion 63 overlaps the region of the magnet 5 when the rotor core 3 is viewed along the longitudinal direction of the magnet housing space 31.

  The protrusion 63 is disposed between the inclined surfaces 51 of the two magnets 5 disposed on both sides of the common second claw 23. Further, the protrusion 63 is disposed in a state where it receives the inclined surfaces 51 of the two magnets 5. That is, the first outer peripheral member 6 receives the inclined surfaces 51 of the two magnets 5 disposed on both sides of the common second claw portion 23 with the common protrusion 63.

  The circumferential width of the projection 63 (that is, the dimension of the projection 63 in the circumferential direction of the first outer circumferential member 6) continuously decreases from the annular body 61 toward the radial thickness. Further, the axial dimension of the protrusion 63 (that is, the dimension of the protrusion 63 in the axial direction of the first outer peripheral member 6) is constant at any radial position. Thereby, the cross-sectional area of the protrusion 63 in a plane orthogonal to the protruding direction of the protrusion 63 decreases from the annular body 61 toward the radially inner side.

  The protrusions 73 are arranged at intervals from each other in accordance with the positions of the first claw portions 13 in the circumferential direction. In addition, each projection 73 is disposed on the outer side in the axial direction than the tip of the first claw portion 13. In this example, a gap exists in the axial direction between the protrusion 73 and the first claw portion 13. Furthermore, at least a part of the protrusion 73 includes a third virtual plane defined in the first embodiment in the magnet insertion virtual space obtained by extending the cross section of the magnet 5 along the longitudinal direction of the magnet housing space 31. It arrange | positions in the space area restrict | limited between the 4th virtual planes. Thereby, at least a part of the protrusion 73 overlaps the region of the magnet 5 when the rotor core 32 is viewed along the longitudinal direction of the magnet housing space 31.

  The protrusion 73 is disposed between the inclined surfaces 51 of the two magnets 5 disposed on both sides of the common first claw portion 13. Further, the protrusion 73 is disposed in a state where the inclined surfaces 51 of the two magnets 5 are received. That is, the second outer peripheral member 7 receives the inclined surfaces 51 of the two magnets 5 disposed on both sides of the common first claw portion 13 with the common protrusion 73.

  The shape of each protrusion 73 is the same as the shape of the protrusion 63 of the first outer peripheral member 6. That is, in the second outer peripheral member 7, the circumferential width of the protrusion 73 (that is, the dimension of the protrusion in the circumferential direction of the second outer peripheral member 7) is continuous from the annular body 71 toward the radially inner side. It is getting smaller. In the second outer peripheral member 7, the axial dimension of the protrusion 73 (that is, the dimension of the protrusion in the axial direction of the second outer peripheral member 7) is constant at any radial position. As a result, in the second outer peripheral member 7, the cross-sectional area of the protrusion in a plane orthogonal to the protruding direction of the protrusion 73 decreases from the annular body 71 toward the radially inner side.

  The inclined surfaces 51 of the two magnets 5 located on both sides of the common protrusion 63 are in contact with the protrusion 63 without a gap. Therefore, the distance between the inclined surfaces 51 of the two magnets 5 positioned on both sides of the common protrusion 63 is continuously reduced toward the radially inner side in accordance with the circumferential width of the protrusion 63. .

  The inclined surfaces 51 of the two magnets 5 located on both sides of the common protrusion 73 are in contact with the protrusion 73 without a gap. Therefore, the distance between the inclined surfaces 51 of the two magnets 5 positioned on both sides of the common protrusion 73 is continuously decreased toward the radially inner side in accordance with the circumferential width of the protrusion 73. . Other configurations and manufacturing methods are the same as those in the first embodiment.

  Even in such a rotor 200, when the rotor core 3 is viewed along the longitudinal direction of the magnet housing space 31, at least a part of the protrusion 63 of the first outer peripheral member 6 and the second outer peripheral member 7. Since at least a part of the protrusion 73 overlaps the region of the magnet 5, the same effect as in the first embodiment can be obtained.

  Further, the magnet 5 has a function of suppressing magnetic flux leakage from the rotor core 3 and interlinking the magnetic flux from the rotor 200 to the stator 300 side when the rotor 200 is rotated. Therefore, if the position of the magnet 5 with respect to the rotor core 3 moves from the original position, the amount of magnetic flux leakage from the rotor core 3 increases, and the output of the rotating electrical machine may be reduced. In the present embodiment, an inclined surface 51 that is inclined with respect to the longitudinal direction of the magnet housing space 31 is provided at the end of the magnet 5, and the projection 63 of the first outer peripheral member 6 and the second outer peripheral member 7. Since the projection 73 of the first outer peripheral member 6 is disposed in a state of receiving the inclined surface 51, the longitudinal direction of the magnet housing space 31 is determined by the projection 63 of the first outer peripheral member 6 and the projection 73 of the second outer peripheral member 7. The movement of the magnet 5 can be more reliably suppressed, and a decrease in the output of the rotating electrical machine can be suppressed. Further, since the inclined surface 51 of the magnet 5 is inclined with respect to the longitudinal direction of the magnet housing space 31, the projections 63 and 73 of the first outer peripheral member 6 and the second outer peripheral member 7 respectively Limiting the length in the longitudinal direction can be avoided, and the length in the longitudinal direction of the magnet 5 can be freely adjusted. Thereby, the magnetic flux amount of the magnet 5 can be adjusted, and the length in the longitudinal direction of the magnet 5 according to the required output of the rotating electrical machine can be selected.

  In the present embodiment, the inclined surface 51 of the magnet 5 is in contact with the protruding portion 63 of the first outer peripheral member 6 and the protruding portion 73 of the second outer peripheral member 7 without a gap, so that the inclined surface of the magnet 5 The contact area between the protrusion 51 and each protrusion can be increased, and a frictional force that prevents the inclined surface 51 of the magnet 5 from sliding relative to the protrusions 63 and 73 can be ensured. Thereby, the movement of the magnet 5 to the longitudinal direction of the magnet accommodation space 31 can be suppressed further reliably.

  In the present embodiment, the circumferential width of the protrusion 63 of the first outer peripheral member 6 and the circumferential width of the protrusion 73 of the second outer peripheral member 7 are continuously reduced toward the radially inner side. Therefore, the contact area between the inclined surface 51 of the magnet 5 and each protrusion can be further increased. Thereby, the frictional force between the inclined surface 51 of the magnet 5 and the protrusions 63 and 73 can be further increased, and the movement of the magnet 5 in the longitudinal direction of the magnet housing space 31 can be further reliably suppressed. it can.

  In the above example, the circumferential widths of the protrusions 63 and 73 of the first outer circumferential member 6 and the second outer circumferential member 7 are continuously reduced toward the radially inner side. The circumferential widths of the protrusions 63 and 73 of the outer circumferential member 6 and the second outer circumferential member 7 may be constant at any radial position.

  Further, a bead formed by welding on the inner peripheral surface of the annular body 61 of the first outer peripheral member 6 may be used as the protrusion 63, or formed by welding on the inner peripheral surface of the annular body 71 of the second outer peripheral member 7. The bead may be the protrusion 73.

  Further, in the first outer peripheral member 6, as shown in FIG. 16, each protrusion 62 according to the first embodiment is combined with each protrusion 63 according to this embodiment that receives the inclined surface 51 of the magnet 5. The body 61 may be provided. In this case, each protrusion 62 according to the first embodiment is arranged in accordance with the position of each protrusion 63 according to the present embodiment in the circumferential direction. In addition, each protrusion 62 according to the first embodiment is disposed on the outer side in the axial direction than each protrusion 63 according to the present embodiment. In this way, the magnet 5 can be more reliably prevented from coming off the rotor core 3.

  Also in the second outer peripheral member 7, each protrusion 72 according to the first embodiment and each protrusion 73 according to the present embodiment that receives the inclined surface 51 of the magnet 5 may be provided on the annular body 71 in combination. Good. In this case, each protrusion 72 according to the first embodiment is arranged in accordance with the position of each protrusion 73 according to the present embodiment in the circumferential direction. In addition, each protrusion 72 according to the first embodiment is arranged on the outer side in the axial direction than each protrusion 73 according to the present embodiment. In this way, the magnet 5 can be more reliably prevented from coming off the rotor core 3.

Embodiment 3 FIG.
FIG. 17 is a perspective view showing a main part of the rotor of the rotating electrical machine according to the third embodiment of the present invention. FIG. 18 is a perspective view showing the first outer peripheral member 6 of FIG. Each protrusion 63 of the first outer peripheral member 6 is provided with a pair of flanges 64 that protrude radially inward from the protrusion 63 toward both sides in the radial direction from the magnet 5. Thereby, the whole shape which put together the projection part 63 and a pair of collar part 64 is T shape. The pair of flange portions 64 are in contact with the radially inner surfaces of the ends of the two magnets 5 adjacent to each other via the common protrusion 63 without any gap.

  Although not shown in the drawings, each protrusion 73 of the second outer peripheral member 7 has a pair of protrusions protruding from the protrusion 73 to both sides in the circumferential direction on the radially inner side of the magnet 5, similarly to the first outer peripheral member 6. A buttocks is provided. Thereby, also in the 2nd outer peripheral member 7, the whole shape which put together the projection part 73 and a pair of collar parts is a T-shape. The pair of flange portions of the second outer peripheral member 7 are in contact with the radially inner surfaces of the ends of the two magnets 5 adjacent to each other via the common protrusion 73 without any gap. Other configurations and the manufacturing method of the rotor 200 are the same as those in the second embodiment.

  Even in such a rotor 200, when the rotor core 3 is viewed along the longitudinal direction of the magnet housing space 31, at least a part of the protrusion 63 of the first outer peripheral member 6 and the second outer peripheral member 7. Since at least a part of the protrusion 73 overlaps the region of the magnet 5, the same effect as in the first embodiment can be obtained.

  In the present embodiment, since the first outer peripheral member 6 and the second outer peripheral member 7 have the projections 63 and 73 similar to those in the second embodiment, the same effects as those in the second embodiment can be obtained. Can be obtained.

  Further, when the rotor 200 rotates, the magnet 5 may receive a radially inward force, but in the present embodiment, from the protrusion 63 of the first outer peripheral member 6 on the radially inner side of the magnet 5. The pair of flanges 64 protrudes on both sides in the circumferential direction, and the pair of flanges protrudes on both sides in the circumferential direction from the protrusions 73 of the second outer periphery member 7 on the radially inner side of the magnet 5. And the movement of the magnet 5 to the inside in the radial direction can be restricted by the respective flange portions of the second outer peripheral member 7. Thereby, breakage of the magnet 5 can be prevented.

  In the above example, the circumferential widths of the protrusions 63 and 73 of the first outer peripheral member 6 and the second outer peripheral member 7 are continuously reduced radially inward. As shown, the circumferential widths of the protrusions 63 and 73 of the first outer peripheral member 6 and the second outer peripheral member 7 may be constant at any radial position.

  Further, in the first outer peripheral member 6, as shown in FIG. 20, each projection 62 according to the first embodiment is combined with each projection 63 according to this embodiment in which a pair of flanges 64 are provided. You may provide in the annular body 61. FIG. In this case, each protrusion 62 according to the first embodiment is arranged in accordance with the position of each protrusion 63 according to the present embodiment in the circumferential direction. In addition, each protrusion 62 according to the first embodiment is disposed on the outer side in the axial direction than each protrusion 63 according to the present embodiment. In this way, the magnet 5 can be more reliably prevented from coming off the rotor core 3.

  Also in the second outer peripheral member 7, the projections 72 according to the first embodiment and the projections 73 according to the present embodiment in which a pair of flanges are provided may be provided on the annular body 71. Good. In this case, each protrusion 72 according to the first embodiment is arranged in accordance with the position of each protrusion 73 according to the present embodiment in the circumferential direction. In addition, each protrusion 72 according to the first embodiment is arranged on the outer side in the axial direction than each protrusion 73 according to the present embodiment. In this way, the magnet 5 can be more reliably prevented from coming off the rotor core 3.

  Further, in the above example, the flange portions of the first outer peripheral member 6 and the second outer peripheral member 7 are in contact with the radially inner surface of the end portion of the magnet 5 without any gap. A gap may be formed between the flange portion and the magnet 5 in a state where the portion is in contact with the radially inner surface of the magnet 5. Further, a buffer material may be interposed between the radially inner surface of the magnet 5 and the flange portion. In this case, the elastic modulus of the cushioning material is set lower than the elastic modulus of each of the flange portion and the magnet 5. In this case, a part of the collar part may be in contact with the radially inner surface of the magnet 5, or the entire collar part may be separated from the magnet 5 by the cushioning material. Examples of the material constituting the buffer material include a resin.

  In the above example, the annular body 61 is in contact with the first field core 1 and the magnet 5, but the annular body 61 does not have to be in contact with both the first field core 1 and the magnet 5. The annular body 61 only needs to be in contact with either the first field core 1 or the magnet 5. Similarly, although the annular body 71 is in contact with the second field core portion 2 and the magnet 5, the annular body 71 does not have to be in contact with both the second field core portion 2 and the magnet 5, and the annular body 71. May be in contact with either the second field core 2 or the magnet 5.

  In the second and third embodiments, the inclined surface 51 of the magnet 5 is in contact with the protrusions 63 and 73 of the first outer peripheral member 6 and the second outer peripheral member 7 without any gap. A gap may be formed between the inclined surface 51 and the protrusions 63 and 73 in a state where the inclined surface 51 is in contact with a part of the protrusions 63 and 73. Further, a cushioning material may be interposed between the projections 63 and 73 of the first outer peripheral member 6 and the second outer peripheral member 7 and the inclined surface 51 of the magnet 5. In this case, the elastic modulus of the buffer material is made lower than the elastic modulus of each of the protrusions 63 and 73 and the magnet 5. In this case, the inclined surface 51 of the magnet 5 may be in contact with a part of the protruding portions 63 and 73, or the protruding portion 63 and the inclined surface 51 of the magnet 5 are separated from the protruding portions 63 and 73. 73 may receive the inclined surface 51 of the magnet 5 via a cushioning material. Examples of the material constituting the buffer material include a resin. In this way, it is possible to prevent the magnet 5 and the protrusions 63 and 73 from being damaged due to collision with each other due to, for example, vibration when the rotor 200 rotates.

  Moreover, in the said Embodiment 2 and 3, although the axial direction dimension of each projection part 63 and 73 of the 1st outer peripheral member 6 and the 2nd outer peripheral member 7 is constant in any position of radial direction, You may make it the axial direction dimension of each projection part 63 and 73 of the 1st outer peripheral member 6 and the 2nd outer peripheral member 7 become small continuously toward radial inner side.

  In the second and third embodiments, the shape of the protrusion 63 of the first outer peripheral member 6 and the shape of the protrusion 73 of the second outer peripheral member 7 do not have to be one type, and are different from each other. You may combine a projection part. Further, the shape, quantity, and position of the protrusions 63 and 73 are not limited to the above example.

  In the second and third embodiments, a gap L exists in the axial direction between the annular body 61 of the first outer circumferential member 6 and the second claw portion 23, and the annular body of the second outer circumferential member 7. There is a gap L in the axial direction between 71 and the first claw portion 13, but the annular body 61 of the first outer peripheral member 6 contacts the end surface of the tip portion of the second claw portion 23, The annular body 71 of the second outer peripheral member 7 may be in contact with the end surface of the distal end portion of the first claw portion 13. Even if it does in this way, while being able to make it difficult to remove the magnet 5 from the rotor core 3, the vibration and noise of the rotor 200 can be suppressed.

  Moreover, in each said embodiment, although the 1st outer peripheral member 6 and the 2nd outer peripheral member 7 are comprised with the magnetic material, it is not limited to this, For example, glass fiber or carbon fiber is used as a reinforcing agent, and a fiber At least one of the first outer peripheral member 6 and the second outer peripheral member 7 may be seamlessly formed in an annular shape by an FRP (Fiber Reinforced Plastics) material whose direction is the circumferential direction.

  In each of the above embodiments, the radially outer surface of the magnet 5 is a flat surface. However, the radially outer surface of the magnet 5 may be a curved surface that swells radially outward. For example, the radially outer surface of the magnet 5 may be a cylindrical surface having the same diameter as the inner diameters of the first outer peripheral member 6 and the second outer peripheral member 7.

  In each of the above embodiments, the magnetizing direction of the magnet 5 is perpendicular to the longitudinal side of the magnet 5, but from the S pole of the first claw portion 13 to the second claw portion 23. As long as the magnet 5 is magnetized in the direction toward the north pole, the magnetizing direction of the magnet 5 may not be orthogonal to the longitudinal side of the magnet 5.

  Moreover, in each said embodiment, although each shape of the annular body 61 of the 1st outer peripheral member 6 and the annular body 71 of the 2nd outer peripheral member 7 is a cyclic | annular form, it is not limited to this, For example, An annular shape along the polygon may be used, or an annular shape along the outer peripheral surface of the rotor core 3 may be used.

  DESCRIPTION OF SYMBOLS 1 1st field iron core part, 2nd 2nd field iron core part, 3 rotor iron core, 4 field coil, 5 magnets, 6 1st outer periphery member, 7 2nd outer periphery member, 13 1st nail | claw Part, 23 2nd nail | claw part, 31 magnet accommodation space, 51 inclined surface, 61,71 annular body, 62,63,72,73 protrusion part, 64 collar part, 200 rotor, 300 stator, 301 stator core 302 Stator coil.

Claims (3)

A stator,
A rotor disposed rotatably inside the stator, and
The stator is
A stator core,
A stator coil provided on the stator iron core,
The rotor is
A rotor core having a first field core and a second field core;
A field coil provided in the rotor core;
A plurality of magnets spaced from each other in the circumferential direction of the rotor core;
A first outer peripheral member provided in the first field core;
A second outer peripheral member provided in the second field core portion,
The first field core portion has a plurality of first claw portions arranged at intervals from each other in the circumferential direction,
The second field core portion has a plurality of second claw portions arranged at intervals from each other in the circumferential direction,
The first field core portion and the second field core portion are combined with each other in a state where the first claw portions and the second claw portions are alternately arranged in the circumferential direction,
Each of the magnets is disposed in a magnet accommodating space existing between the first claw portion and the second claw portion, and is directed from the second claw portion toward the first claw portion. Magnetized to
The first outer peripheral member has a first annular body made of a magnetic material,
The radially inner surface of the first annular body is in contact with at least one of the first claw portion and the magnet,
The second outer peripheral member has a second annular body made of a magnetic material,
The radially inner surface of the second annular body is in contact with at least one of the second claw portion and the magnet,
A gap exists in the axial direction between the first outer peripheral member and the second claw portion,
A gap exists in the axial direction between the second outer peripheral member and the first claw portion,
The first outer peripheral member and the second outer peripheral member each have a protruding portion protruding radially inward,
When at least a part of the protrusion of the first outer peripheral member and at least a part of the protrusion of the second outer peripheral member look at the rotor core along the longitudinal direction of the magnet housing space. , Overlapping the magnet area,
An inclined surface that is inclined with respect to the longitudinal direction of the magnet housing space is provided at the end of the magnet,
The inclined surface is opposed to the inclined surface of the magnet adjacent in the circumferential direction,
The protrusion is arranged in a state of receiving the inclined surface,
The circumferential width of the protrusion is continuously reduced radially inward,
The distance between the inclined surfaces facing each other is a rotating electrical machine that continuously decreases inward in the radial direction in accordance with the circumferential width of the protrusion . A stator,
A rotor disposed rotatably inside the stator, and
The stator is
A stator core,
A stator coil provided on the stator iron core,
The rotor is
A rotor core having a first field core and a second field core;
A field coil provided in the rotor core;
A plurality of magnets spaced from each other in the circumferential direction of the rotor core;
A first outer peripheral member provided in the first field core;
A second outer peripheral member provided in the second field core portion,
The first field core portion has a plurality of first claw portions arranged at intervals from each other in the circumferential direction,
The second field core portion has a plurality of second claw portions arranged at intervals from each other in the circumferential direction,
The first field core portion and the second field core portion are combined with each other in a state where the first claw portions and the second claw portions are alternately arranged in the circumferential direction,
Each of the magnets is disposed in a magnet accommodating space existing between the first claw portion and the second claw portion, and is directed from the second claw portion toward the first claw portion. Magnetized to
The first outer peripheral member has a first annular body made of a magnetic material,
The radially inner surface of the first annular body is in contact with at least one of the first claw portion and the magnet,
The second outer peripheral member has a second annular body made of a magnetic material,
The radially inner surface of the second annular body is in contact with at least one of the second claw portion and the magnet,
A gap exists in the axial direction between the first outer peripheral member and the second claw portion,
A gap exists in the axial direction between the second outer peripheral member and the first claw portion,
The first outer peripheral member and the second outer peripheral member each have a protruding portion protruding radially inward,
When at least a part of the protrusion of the first outer peripheral member and at least a part of the protrusion of the second outer peripheral member look at the rotor core along the longitudinal direction of the magnet housing space. , Overlapping the magnet area,
An inclined surface that is inclined with respect to the longitudinal direction of the magnet housing space is provided at the end of the magnet,
The protrusion is arranged in a state of receiving the inclined surface,
A rotating electrical machine in which the protrusion is provided with a pair of flanges that protrude radially inward from the protrusion on both sides in the radial direction of the magnet. Wherein the first peripheral member and said second outer circumferential member, the rotary electric machine according to claim 1 or claim 2 tensile stress is generated in the circumferential direction.

Images