JP2010187476A - Rotary electric machine - Google Patents

Abstract

The present invention provides a rotating electrical machine that can increase the reliability of magnet holding, simplify the magnet holding structure, improve the assembly of the magnet, reduce the production cost, and increase the mass productivity.
First and second permanent magnet holding portions (30, 40) are opposed to inner peripheral surfaces on the front end side of first and second claw-shaped magnetic pole portions (20, 24), and second and first yoke portions (23, 19). The first and second magnet folder holding holes 31, 41 are projected from one end in the axial direction so that the center of the hole coincides with the first and second permanent magnet holding portions 30, 40 in the axial direction. It is opened in a C-shaped arc-shaped cross section that penetrates the end and opens radially outward over the entire region from one end to the other end in the axial direction. The first and second magnet folders 33 and 43 fitted with the first and second permanent magnets 37 and 47 having a columnar body having a quadrangular section are connected to the fitting portion 34 by the first and second magnet folder holding holes 31 and 41 is inserted and held.
[Selection] Figure 2

Description

  The present invention relates to a rotating electrical machine such as a vehicular AC generator, and more particularly to a permanent magnet holding structure in a Landel rotor.

  Vehicle alternators using Landel rotors have been used in automobiles for decades. Due to environmental problems in recent years, the load of electrical components mounted on the vehicle has increased rapidly, and a further increase in the power generation amount of the Landel rotor has been demanded.

  Conventionally, in order to solve such a problem, a means for arranging a permanent magnet between claw-shaped magnetic poles facing the circumferential direction of a Landel-type rotor has been taken (for example, see Patent Documents 1 and 2). .

  Further, the permanent magnet is held in a pocket formed integrally with the fan, and the pocket is press-fitted between the upper surface of the body of the first pole piece and the lower surface of the pole finger of the second pole piece, and the fan is inserted into the first pole. The fan is attached to the second pole piece by attaching the pocket to the piece and press-fitting the pocket between the upper surface of the body of the second pole piece and the lower surface of the pole finger of the first pole piece. 3).

JP-A-61-85045 US Pat. No. 4,895,577 JP-T-2002-517015

  In Patent Documents 1 and 2, in order to hold the permanent magnet between the claw-shaped magnetic pole portions, it is necessary to position the permanent magnet with high accuracy with respect to the opposing claw-shaped magnetic pole portion, and a magnet holding member is added, or It was necessary to form a magnet holding groove in the claw-shaped magnetic pole portion by machining, resulting in an increase in production cost and a decrease in mass productivity. Further, since relative displacement occurs between adjacent claw-shaped magnetic pole portions during high-speed rotation, a structure in which the centrifugal force applied to the permanent magnet is held between the claw-shaped magnetic pole portions cannot stably hold the permanent magnet. .

  In the device described in Patent Document 3, the pocket for holding the permanent magnet is formed in a substantially rectangular cross-sectional shape that fits into the fitting space between the body of one pole piece and the pole finger of the other pole piece. In order to strengthen the holding of the pocket holding the permanent magnet, it is necessary to process the fitting surface of the pole piece with high accuracy. However, the mating surface with the pocket of the pole piece is a flat surface or a gently curved surface, and post-processing of the pole piece with a high-performance machine tool is required, which requires enormous processing costs and processing time. Further, since the tip of the claw-shaped magnetic pole portion is displaced radially outward during high-speed rotation, the structure in which the centrifugal force applied to the permanent magnet is held by the claw-shaped magnetic pole portion cannot stably hold the permanent magnet.

  The present invention has been made to solve such a problem, and the displacement of the tip of the claw-shaped magnetic pole part due to centrifugal force and the relative displacement between adjacent claw-shaped magnetic pole parts are held by the magnet. It is possible to obtain a rotating electrical machine that can improve the magnet holding reliability, simplify the magnet holding structure, improve the assembly of the magnet, reduce the production cost and increase the mass productivity. Objective.

  The rotating electrical machine according to the present invention includes a boss portion, a pair of yoke portions extending radially outward from both axial end edges of the boss portion, and an axial direction alternately from each of the pair of yoke portions. A pole core that has a plurality of claw-shaped magnetic pole portions that are extended and meshed with each other and arranged in the circumferential direction, fixed to a shaft that is inserted through the axial center of the boss portion, the boss portion, and the pair of yokes And a field coil housed in a space surrounded by the plurality of claw-shaped magnetic pole portions, and an outer periphery of the rotor is disposed so as to surround a predetermined air gap. And a stator. Further, a permanent magnet holding portion integrally projecting from the yoke portion at the portion of the pair of yoke portions facing the inner peripheral surface on the front end side of the plurality of claw-shaped magnetic pole portions, and the permanent magnet holding portion The center of each hole is aligned with the axial direction, penetrates from one end of the axial direction to the other end, and opens radially outward across the entire area from one end to the other end in the axial direction. A magnet folder holding hole formed in a C-shaped arc-shaped hole shape, and a fitting inserted and held in the magnet folder holding hole in a C-shaped arc-shaped outer shape. A magnet folder made of a magnetic material having a projection part projecting radially outward from the fitting part and projecting radially outward from the magnet folder holding hole, and a columnar shape having a square section The field coil is fabricated on the body and attached to the protrusion of the magnet folder. Is provided with a permanent magnet that is magnetically oriented in the direction of the magnetic field in the opposite direction to make, the.

  According to this invention, the magnet folder holding the permanent magnet is held on the yoke part side. Therefore, since the displacement of the claw-shaped magnetic pole portion due to the centrifugal force does not affect the permanent magnet, the permanent magnet can be easily held and the reliability of the magnet holding is increased. Further, since the permanent magnet is located on the inner diameter side of the claw-shaped magnetic pole portion, the centrifugal force acting on the permanent magnet is reduced, the permanent magnet can be easily held, and the magnet holding reliability is increased.

  In addition, the magnet folder holding the permanent magnet includes a fitting portion formed in an arcuate outer shape with a C-shaped cross section and a magnet folder holding hole with an arc-shaped hole shape with a C-shaped cross section. Since it is hold | maintained at the permanent magnet holding | maintenance part by fitting, the holding structure of a magnet folder is simplified and the assembly | attachment property of a magnet folder becomes easy. Moreover, the magnet folder holding hole can be easily and accurately manufactured using a rotary cutting tool such as a drill or reamer, and the rattling of the fitting portion between the magnet folder fitting portion and the magnet folder holding hole is suppressed. Can do. Furthermore, since the hole center of the magnet folder holding hole is made to coincide with the axial direction, the fitting portion of the magnet folder can be inserted into the magnet folder holding hole from the axial direction, and the magnet folder can be easily assembled. For these reasons, the production cost can be reduced and the mass productivity can be improved.

1 is a cross-sectional view schematically showing an automotive alternator according to Embodiment 1 of the present invention. It is a disassembled perspective view which shows the rotor applied to the vehicle alternator which concerns on Embodiment 1 of this invention. It is a perspective view which shows the magnetic thin plate which comprises the magnet folder in the alternating current generator for vehicles which concerns on Embodiment 1 of this invention. It is a perspective view explaining the mounting method to the magnet folder of the permanent magnet in the alternating current generator for vehicles concerning Embodiment 1 of this invention. It is a schematic diagram for demonstrating the flow of the magnetic flux in the alternating current generator for vehicles which concerns on Embodiment 1 of this invention. It is a schematic diagram for demonstrating the flow of the magnetic flux in the alternating current generator for vehicles which concerns on Embodiment 1 of this invention. It is a perspective view which shows the mounting state to the magnet folder of the permanent magnet in the vehicle alternator which concerns on Embodiment 2 of this invention. It is a perspective view explaining the assembly method of the magnet assembly in the alternating current generator for vehicles concerning Embodiment 3 of this invention. It is sectional drawing which shows the state before the magnet assembly mounting of the alternating current generator for vehicles concerning Embodiment 3 of this invention. It is sectional drawing which shows the state after the magnet assembly mounting of the alternating current generator for vehicles concerning Embodiment 3 of this invention. It is a perspective view explaining the assembly method of the magnet assembly in the alternating current generator for vehicles concerning Embodiment 4 of this invention. It is a perspective view explaining the mounting method to the pole core body of the magnet assembly in the alternating current generator for vehicles concerning Embodiment 4 of this invention. It is sectional drawing which shows the magnet assembly mounting state of the alternating current generator for vehicles which concerns on Embodiment 4 of this invention.

Embodiment 1 FIG.
FIG. 1 is a sectional view schematically showing an automotive alternator according to Embodiment 1 of the present invention, and FIG. 2 shows a rotor applied to the automotive alternator according to Embodiment 1 of the present invention. FIG. 3 is an exploded perspective view, FIG. 3 is a perspective view showing a magnetic thin plate constituting a magnet folder in the automotive alternator according to Embodiment 1 of the present invention, and FIG. 4 is an automotive alternating current generator according to Embodiment 1 of the present invention. FIG. 5 and FIG. 6 are schematic diagrams for explaining the flow of magnetic flux in the vehicle alternator according to Embodiment 1 of the present invention. is there.

  1 to 4, a vehicular AC generator 1 as a rotating electrical machine includes a case 4 formed of a substantially bowl-shaped aluminum front bracket 2 and a rear bracket 3, and a shaft 16 with a case 4 and a bearing 5. The rotor 13 rotatably supported in the case 4, the pulley 6 fixed to the end of the shaft 16 extending to the front side of the case 4, and the axial direction of the rotor 13 The fan 7 fixed to both end faces of the rotor, the stator 10 having a constant air gap 29 with respect to the rotor 13, surrounding the outer periphery of the rotor 13 and fixed to the case 4, and the shaft 16 A pair of slip rings 8 fixed to the rear side and supplying current to the rotor 13 and a pair of brushes 9 disposed in the case 4 so as to slide on the slip rings 8 are provided. Although not shown, a rectifier that rectifies alternating current generated in the stator 10 into direct current, a voltage regulator that adjusts the magnitude of the alternating voltage generated in the stator 10, and the like are disposed in the case 4. .

  The stator 10 is wound around a cylindrical stator core 11 and the stator core 11, and an alternating current is generated by a change in magnetic flux from a field coil 14 (to be described later) as the rotor 13 rotates. And.

The rotor 13 includes a field coil 14 that generates a magnetic flux when an excitation current is passed, a pole core 15 that is provided so as to cover the field coil 14, and a magnetic pole is formed by the magnetic flux, and an axial center position of the pole core 15. And a shaft 16 penetrating into the shaft.
The pole core 15 is divided into first and second pole core bodies 17 and 21 made of a low carbon steel such as S10C by a cold forging method.

  The first pole core body 17 has a cylindrical outer peripheral surface, a first boss portion 18 formed with a shaft insertion hole 18a penetrating the axial center position, and radially outward from one end edge of the first boss portion 18. A thick ring-shaped first yoke portion 19 that is extended, and a first claw-shaped magnetic pole portion 20 that extends from the outer peripheral portion of the first yoke portion 19 to the other end side in the axial direction are provided. . The first claw-shaped magnetic pole portion 20 has a substantially trapezoidal outermost surface shape, the circumferential width gradually decreases toward the distal end side, and the radial thickness gradually decreases toward the distal end side. It is formed in a tapered shape, and eight, for example, are arranged on the outer peripheral portion of the first yoke portion 19 at an equiangular pitch in the circumferential direction.

  The second pole core body 21 has a cylindrical outer peripheral surface, a second boss portion 22 formed with a shaft insertion hole 22a passing through the axial center position, and a radially outer side from the other end edge of the second boss portion 22. A thick ring-shaped second yoke portion 23 extending from the outer periphery of the second yoke portion 23 and a second claw-shaped magnetic pole portion 24 extending to one end in the axial direction. . The second claw-shaped magnetic pole portion 24 has a substantially trapezoidal outermost surface shape, its circumferential width gradually decreases toward the distal end side, and its radial thickness gradually decreases toward the distal end side. For example, eight taper shapes are arranged on the outer peripheral portion of the second yoke portion 23 at an equiangular pitch in the circumferential direction.

  The first and second pole core bodies 17 and 21 configured as described above mesh with the first and second claw-shaped magnetic pole portions 20 and 24 alternately, and the other end surface of the first boss portion 18 is connected to the second boss. It abuts on one end surface of the portion 22 and is fixed to the shaft 16 penetrating the shaft insertion holes 18a, 22a. A field coil 14 wound around a bobbin (not shown) includes first and second boss portions 18 and 22, first and second yoke portions 19 and 23, and first and second claw-shaped magnetic poles. It is mounted in a space surrounded by the parts 20 and 24. Here, the first and second boss portions 18 and 22 and the first and second yoke portions 19 and 23 correspond to the boss portion of the pole core 15 and the pair of yoke portions, respectively.

  A first magnet holding pedestal 30 as a permanent magnet holding part is integrally formed with the first pole core body 17. The first magnet holding pedestal 30 is integrally projected on the outer peripheral surface of the first yoke portion 19 that faces the inner peripheral surface of the tip end side of each second claw-shaped magnetic pole portion 24. The first magnet folder holding hole 31 extends through the first magnet holding pedestal 30 from the one end to the other end in the axial direction with the hole center aligned in the axial direction and from one end to the other end in the axial direction. A cross section that opens outward in the radial direction and is perpendicular to the center of the hole is formed into a C-shaped arc-shaped hole shape. The first axial opening 32 that opens the first magnet folder holding hole 31 radially outward across the entire region from one end to the other end in the axial direction is formed on the tip side inner peripheral surface of the second claw-shaped magnetic pole portion 24. Opposite.

  The first magnet folder 33 includes a fitting portion 34 having an arcuate outer shape with a C-shaped cross section that matches the inner shape of the first magnet folder holding hole 31, and a cross-sectional circle of the fitting portion 34. A columnar body having a predetermined thickness having a protrusion 35 having a trapezoidal cross section integrally projecting radially outward from an arcuate chord. The projecting portion 35 having a trapezoidal cross section has an outer shape whose circumferential width gradually increases outward from the arcuate chord portion having a C-shaped cross section of the fitting portion 34. Further, the magnet fitting groove 36 is recessed in a groove shape in which the groove direction is a thickness direction and the groove width is gradually narrowed toward the tip surface in the protrusion direction of the protrusion 35 on the tip surface in the protrusion direction of the protrusion 35. It is installed.

  As shown in FIG. 3, the magnetic thin plate 48 is integrated with a trapezoid in which a trapezoidal groove 48a is formed at the bottom and a C-shaped arc, and the upper side of the trapezoid is an arc-shaped chord. It is made by press molding a carbon steel plate or an electromagnetic steel plate. The first magnet folder 33 is manufactured by laminating and integrating a predetermined number of magnetic thin plates 48 press-molded in such an outer shape. And the groove part 48a is continued in the lamination direction, and the magnet fitting groove | channel 36 is comprised.

  The first permanent magnet 37 is formed into a columnar body having an outer shape that matches the inner shape of the magnet fitting groove 36, that is, a trapezoidal cross section. And the 1st permanent magnet 37 is engage | inserted by the magnet fitting groove | channel 36 from the thickness direction outer side of the 1st magnet folder 33, as FIG. 4 shows. As a result, the first permanent magnet 37 has its bottom surface in contact with the bottom surface of the magnet fitting groove 36 or opposed with a minute gap, and the bottom surface side is fitted into the magnet fitting groove 36 so that the first magnet folder 33 is attached. In addition, although the 1st permanent magnet 37 is hold | maintained at the 1st magnet folder 33 with the fitting force between the magnet fitting grooves 36, you may apply | coat an adhesive agent as needed.

  In the first magnet folder 33 to which the first permanent magnet 37 is attached, the fitting portion 34 is inserted and held in the first magnet folder holding hole 31 from the axial direction. At this time, the protruding portion 35 protrudes radially outward from the first axial opening 32 and faces the inner peripheral surface of the distal end side of the second claw-shaped magnetic pole portion 24. The first permanent magnet 37 is disposed with the upper side of the trapezoidal cross section close to the inner peripheral surface of the tip end side of the second claw-shaped magnetic pole portion 24. Note that the thickness direction of the first magnet folder 33 and the groove direction of the magnet fitting groove 36 coincide with the axial direction of the rotor 13. Moreover, although the 1st magnet folder 33 is hold | maintained at the 1st magnet holding base 30 by the fitting force between the 1st magnet folder holding holes 31, you may apply | coat an adhesive agent as needed.

  A second magnet holding base 40 as a permanent magnet holding part is integrally formed with the second pole core body 21. The second magnet holding pedestal 40 is integrally projected on the outer peripheral surface of the second yoke portion 23 that faces the inner peripheral surface of the tip end side of each first claw-shaped magnetic pole portion 20. The second magnet folder holding hole 41 extends through the second magnet holding base 40 from the one end to the other end in the axial direction with the hole center aligned in the axial direction and from the one end to the other end in the axial direction. A cross section that opens outward in the radial direction and is perpendicular to the center of the hole is formed into a C-shaped arc-shaped hole shape. The second axial opening 42 that opens the second magnet folder holding hole 41 radially outward across the entire region from one end to the other end in the axial direction is formed on the tip side inner peripheral surface of the first claw-shaped magnetic pole part 20. Opposite.

  The second magnet folder 43 includes a fitting part 44 having a C-shaped arcuate outer shape that matches the inner shape of the second magnet folder holding hole 41, and a cross-sectional circle of the fitting part 44. A columnar body having a predetermined thickness having a protrusion 45 having a trapezoidal cross section integrally projecting radially outward from an arcuate chord. The protrusion 45 having a trapezoidal cross section has an outer shape in which the circumferential width gradually increases from the arcuate chord part having a C-shaped cross section of the fitting part 44 toward the outer side in the radial direction. Further, the magnet fitting groove 46 is recessed in a groove shape in which the groove direction is a thickness direction and the groove width is gradually narrowed toward the tip surface in the protrusion direction of the protrusion 45 on the tip surface in the protrusion direction of the protrusion 45. It is installed.

  As shown in FIG. 3, the magnetic thin plate 49 is integrated with a trapezoid in which a trapezoidal groove 49a is formed at the bottom and a C-shaped arc, and the upper side of the trapezoid is an arc-shaped chord. It is made by press molding a carbon steel plate or an electromagnetic steel plate. The second magnet folder 43 is manufactured by laminating and integrating a predetermined number of magnetic thin plates 49 press-molded in such an outer shape. And the groove part 49a is continued in the lamination direction, and the magnet fitting groove | channel 46 is comprised.

  The second permanent magnet 47 is formed into a columnar body having an outer shape that matches the inner shape of the magnet fitting groove 46, that is, a trapezoidal cross section. And the 2nd permanent magnet 47 is engage | inserted by the magnet fitting groove | channel 46 from the thickness direction outer side of the 2nd magnet folder 43, as FIG. 4 shows. As a result, the second permanent magnet 47 has its bottom surface in contact with the bottom surface of the magnet fitting groove 46 or opposed with a minute gap, and the bottom surface side is fitted into the magnet fitting groove 46 so that the second magnet folder is provided. 43 is attached. In addition, although the 2nd permanent magnet 47 is hold | maintained at the 2nd magnet folder 43 by the fitting force between the magnet fitting grooves 46, you may apply | coat an adhesive agent as needed.

  In the second magnet folder 43 to which the second permanent magnet 47 is attached, the fitting portion 44 is inserted and held in the second magnet folder holding hole 41 from the axial direction. At this time, the protruding portion 45 protrudes radially outward from the first axial opening 42 and faces the inner peripheral surface on the front end side of the first claw-shaped magnetic pole portion 20. The second permanent magnet 47 is arranged with the upper side of the trapezoidal cross section close to the inner peripheral surface of the first claw-shaped magnetic pole part 20. The thickness direction of the second magnet folder 43 and the groove direction of the magnet fitting groove 46 coincide with the axial direction of the rotor 13. Moreover, although the 2nd magnet folder 43 is hold | maintained at the 2nd magnet holding base 40 by the fitting force between the 2nd magnet folder holding holes 41, you may apply | coat an adhesive agent as needed.

  Further, in the first and second permanent magnets 37 and 47, the magnetization direction 50 is opposite to the direction of the magnetic field 51 formed in the plane in which the field current flowing through the field coil 14 is orthogonal to the axis of the rotor 13. It is so magnetized. That is, as shown in FIG. 1, when the field coil 14 is energized and the magnetic field 51 is generated in the direction of the arrow, the first and second permanent magnets 37 and 47 are magnetized in the opposite direction to the magnetic field 51. Is done. Here, the magnetization directions 50 of the first and second permanent magnets 37 and 47 coincide with the radial direction, and the first and second claw-shaped magnetic pole portions 20, which are opposed to the extension lines of the magnetization direction 50, 24 toward the inner peripheral surface on the tip side. In the case of a design in which the direction of the magnetic field 51 generated by the field current flowing through the field coil 14 is reversed, the first and second permanent magnets 37 and 47 are also magnetized and oriented in opposite directions.

Next, the operation of the vehicular AC generator 1 configured as described above will be described.
First, a current is supplied from a battery (not shown) to the field coil 14 of the rotor 13 via the brush 9 and the slip ring 8, and a magnetic flux is generated. By this magnetic flux, the first claw-shaped magnetic pole part 20 of the first pole core body 17 is magnetized to the N pole, and the second claw-shaped magnetic pole part 24 of the second pole core body 21 is magnetized to the S pole.
On the other hand, the rotational torque of the engine is transmitted to the shaft 16 via a belt (not shown) and the pulley 6, and the rotor 13 is rotated. Therefore, a rotating magnetic field is applied to the stator coil 12 of the stator 10, and an electromotive force is generated in the stator coil 12. This AC electromotive force is rectified into a DC current by a rectifier, and the battery is charged or supplied to an electric load.

Next, the operation of the magnetic flux will be described with reference to FIGS.
First, when the field coil 14 is energized, a magnetic flux 51a is generated. The magnetic flux 51 a enters the teeth portion of the stator core 11 from the first claw-shaped magnetic pole portion 20 through the air gap 29. Then, the magnetic flux 50a moves in the circumferential direction from the tooth portion of the stator core 11 through the core back portion, and passes through the air gap 29 from the tooth portion facing the adjacent second claw-shaped magnetic pole portion 24. The claw-shaped magnetic pole part 24 is entered. Next, the magnetic flux 50 a that has entered the second claw-shaped magnetic pole portion 24 passes through the second yoke portion 23, the second boss portion 22, the first boss portion 18, and the first yoke portion 19, and thus the first claw-shaped magnetic pole portion. 20 is reached. Here, in the conventional Landell type rotor, the first and second pole core bodies are designed to be limited, so that magnetic saturation occurs due to the magnetic field generated by the field coil, and the magnetic flux generated in the rotor decreases.

  In the first embodiment, the first and second permanent magnets 37 and 47 are magnetized and oriented so as to be opposite to the direction of the magnetic field 51 generated by the field coil 14. Therefore, the direction of the magnetic field generated by the first and second permanent magnets 37 and 47 is opposite to that of the magnetic field 51 generated by the field coil 14. In order for the magnetic flux 52 generated from the first and second permanent magnets 37 and 47 to interlink with the stator core 11, it is necessary to reciprocate through the air gap 29 having a large magnetic resistance. The first and second permanent magnets 37 and 47 are disposed on the inner diameter side of the second and first claw-shaped magnetic pole portions 24 and 20, and the first and second claw-shaped magnetic pole portions 20 and 24 It arrange | positions so that it may circulate with a shorter magnetic path length with respect to the surrounding surface side. Therefore, most of the magnetic flux 52 forms a closed magnetic circuit inside the rotor 13 without detouring to the stator core 11.

That is, the magnetic flux 52 generated from the first permanent magnet 37 is transmitted from the first magnet holding base 30 to the first yoke part 19, the first boss part 18, the second boss part 22, the second yoke part 23, and the second claw. Return to the first permanent magnet 37 through the magnetic pole portion 24. The magnetic flux 51 generated from the second permanent magnet 47 enters the first claw-shaped magnetic pole part 20 through the gap, and the first yoke part 19, the first boss part 18, the second boss part 22, and the second joint. It passes through the iron part 23 and the second magnet holding base 40 and returns to the second permanent magnet 47.
Therefore, the magnetic flux 51 generated by the first and second permanent magnets 37 and 47 is opposite to the magnetic flux 51a generated by the field coil 14, and the magnetic flux constituting the first and second pole core bodies 17 and 21 is reversed. The density can be greatly reduced and magnetic saturation can be eliminated.

According to the first embodiment, since the first and second permanent magnets 37 and 47 are disposed, magnetic saturation is eliminated, the magnetic flux linked to the stator 10 is increased, and the amount of power generation is increased. be able to. In particular, the amount of power generation in the low-speed idling region where magnetic saturation is remarkable can be greatly increased.
In addition, the first and second permanent magnets 37 and 47 are disposed so as to face the inner peripheral surfaces of the front end side of the first and second claw-shaped magnetic pole portions 20 and 24, so that the first and second permanent magnets are disposed. The magnets 37 and 47 are located radially inward with respect to the outermost peripheral surface of the rotor 13. Therefore, the stator slot harmonics remain on the outermost peripheral surface portions of the first and second claw-shaped magnetic pole portions 20 and 24, and do not act to directly heat the first and second permanent magnets 37 and 47. As a result, the first and second permanent magnets 37 and 47 are prevented from being heated and demagnetized.

  In addition, since the first and second permanent magnets 37 and 47 are disposed so as to face the inner peripheral surfaces of the first and second claw-shaped magnetic pole portions 20 and 24, the first and second permanent magnets are disposed. The magnetic circuit of the magnets 37 and 47 becomes a magnetic circuit closed inside the rotor, and the magnetic flux component linked to the stator 10 is eliminated. Therefore, the generation of the induced voltage of the first and second permanent magnets 37 and 47 during no load and no excitation is suppressed. As a result, the magnet amount of the first and second permanent magnets 37 and 47 can be increased.

  Further, the first and second permanent magnets 37 and 47 are attached to the first and second yoke portions 19 and 23. Therefore, since the first and second permanent magnets 37, 37 are located on the inner diameter side of the first and second claw-shaped magnetic pole portions 20, 24, the centrifugal force applied to the first and second permanent magnets 37, 47 is reduced. It becomes small and the holding structure of the 1st and 2nd permanent magnets 37 and 47 can be simplified. Further, since the first and second permanent magnets 37 and 47 are not affected by the first and second claw-shaped magnetic pole portions 20 and 24 that are largely displaced with respect to the centrifugal force, the first and second permanent magnets 37 and 47 are not affected. Is easy to hold. From these things, the reliability of holding | maintenance of the 1st and 2nd permanent magnets 37 and 47 is improved.

Here, since the 1st and 2nd pole core bodies 17 and 21 are produced by the cold forging manufacturing method, it is difficult to obtain a highly accurate magnet holding shape. Therefore, in order to obtain a highly accurate magnet holding shape, the first and second pole core bodies 17 and 21 manufactured by the cold forging method have to be cut using an NC processing machine or the like.
In the first embodiment, the first and second magnet folder holding holes 31 and 41 for holding the magnet are formed in an arcuate cylindrical shape with a C-shaped cross section, and thus are produced by a cold forging method. The first and second pole core bodies 17 and 21 are simply subjected to additional machining with a rotary cutting tool such as a drill or a reamer, so that the first and second magnet folder holding holes 31 and 41 with high-precision hole dimensions are formed. Can be formed. As a result, the fitting surfaces of the first and second magnet folder holding holes 31 and 41 can be produced by cutting with a rotary cutting tool, and three-dimensional cutting using an NC processing machine is not necessary, and the manufacturing time is reduced. The manufacturing cost can be reduced while being shortened.

  In addition, since the processing accuracy of the fitting surfaces of the first and second magnet folder holding holes 31 and 41 can be increased, the first and second magnet folders in which the first and second permanent magnets 37 and 47 are held. The fitting portions 34 and 44 of 33 and 43 can be firmly held in the first and second magnet folder holding holes 31 and 41 in a stable state without rattling. Therefore, even if the rotor 13 rotates at a high speed, the first and second magnet folders 33 and 43 come out of the first and second magnetic folder stone holding holes 31 and 41 and are scattered, and the first and second permanent magnets 37 are scattered. , 47 is avoided.

  In addition, the first and second magnet folder holding holes 31 and 41 are formed in an arcuate cylindrical shape having a C-shaped cross section with the hole centers aligned in the axial direction, and the first and second magnet folders 33, 43 fitting portions 34 and 44 are inserted and held in the first and second magnet folder holding holes 31 and 41 from the axial direction. Therefore, the holding structure of the magnet folders 33 and 43 is simplified, the assembling property is improved, the production cost is reduced, and the mass productivity is improved.

Further, since the contact surfaces of the first and second magnet folder holding holes 31 and 41 and the fitting portions 34 and 44 of the first and second magnet folders 33 and 43 are cylindrical surfaces, there is no local stress concentration. The occurrence of damage to the first and second magnet holding bases 30 and 40 is suppressed.
In addition, since the first and second permanent magnets 37 and 47 are formed in a columnar body having a trapezoidal cross section, the first and second permanent magnets 37 and 47 can be efficiently cut out from the magnet base material using a grindstone. , Material yield is increased.

  In addition, since the first and second magnet folders 33 and 43 are formed by laminating the magnetic thin plates 48 and 49 punched by press working, the first and second magnet folder holding holes 31 and 41 have the hole shapes. The first and second magnet folders 33 and 43 having complicated outer shapes including the fitting portions 34 and 44 and the projecting portions 35 and 45 extending from the first and second axial openings 32 and 42 are highly accurate. In addition, it can be easily produced. Therefore, the fitting portions 34 and 44 of the first and second magnet folders 33 and 43 can be held in the first and second magnet folder holding holes 31 and 41 without rattling. Further, the magnet fitting grooves 36 and 46 can be easily manufactured with high accuracy. Therefore, the first and second permanent magnets 37 and 47 can be held on the first and second magnet folders 33 and 43 without rattling. Furthermore, since the magnet folders 33 and 43 made of a magnetic material are interposed between the first and second permanent magnets 37 and 47 and the first and second magnet holding bases 30 and 40, the magnetic resistance between them is reduced. The Therefore, the magnetic resistance of the magnet magnetic path is reduced, the amount of magnet magnetic flux is increased, the effect of relaxing the magnetic saturation of the rotor is increased, and the power generation output can be increased.

  The first and second magnet folders 33 and 43 are mounted in the first and second magnet folder holding holes 31 and 41 with the protruding portions 35 and 45 protruding from the first and second axial openings 32 and 42, respectively. ing. Therefore, by increasing the radial height of the projecting portions 35 and 45, the tips of the opposing second and first claw-shaped magnetic pole portions 24 and 20 can be obtained without increasing the first and second permanent magnets 37 and 47. The gap between the side inner peripheral surface can be reduced.

  Here, in a Landell-type rotor that increases the magnetomotive force of the field coil 14 by increasing the winding height of the field coil 14 and increasing the number of turns, and obtaining a large power generation output, the winding of the field coil 14 is increased. As the height increases, the radial positions of the first and second claw-shaped magnetic pole portions 20 and 24 increase. If this magnet holding structure is adopted for such a Landel type rotor, the first and second permanent magnets 37 and 47 can be made large by increasing the radial height of the projecting portions 35 and 45. A predetermined gap can be secured between the opposing second and first claw-shaped magnetic pole portions 24 and 20 and the inner peripheral surfaces on the front end side.

  The first and second magnet holders 33 and 43 are held by the first and second magnet holding bases 30 and 40 by fitting the fitting portions 34 and 44 into the first and second magnet holding holes 31 and 41. Therefore, the arcs in the cross sections of the fitting portions 34 and 44 and the first and second magnet holding holes 31 and 41 are superior arcs. That is, the length of the chord portion having a circular arc shape in the fitting portions 34 and 44 is shortened. However, since the protrusions 35 and 45 are formed in an outer shape whose circumferential width gradually increases outward in the radial direction, the circumferential width of the tip surface of the protrusions 35 and 45 is set to the fitting part 34, 45. It can be made longer than the length of the chord portion of the arcuate section of 44. Thereby, since the groove width of the first and second magnet fitting grooves 36 and 46 can be increased, the angle formed between the inner surface of the groove and the bottom surface of the groove can be reduced, and the first and second permanent due to the application of centrifugal force. It is possible to reliably prevent the magnets 37 and 47 from jumping out.

  Here, it is necessary to magnetize the permanent magnet in any step of manufacturing the rotor 13, and when handling the magnetized permanent magnet, it is necessary to demagnetize the entire apparatus.

  Therefore, the non-magnetized permanent magnet cut out from the magnet base material is inserted and held in the magnet fitting grooves 36 and 46 of the first and second magnet folders 33 and 43, and then the non-magnetized permanent magnet is held. A magnetic field is applied to the first and second magnet folders 33 and 43 to magnetize an unmagnetized permanent magnet. Next, the first and second magnet cores 33 and 43 holding the magnetized permanent magnets (first and second permanent magnets 37 and 47) are connected to the first and second pole core bodies 17 and 21, respectively. It is preferable to insert and hold in the two-magnet folder holding holes 31, 41. That is, since the first and second magnet folders 33 and 43 holding the first and second permanent magnets 37 and 47 have the fitting portions 34 and 44 that can be gripped, handling by a robot or an automatic machine is easy. Therefore, it is not necessary to make all the devices non-magnetic.

Further, the first and second magnet folders 33 and 43 holding the non-magnetized permanent magnets are inserted and held in the first and second magnet folder holding holes 31 and 41 of the first and second pole core bodies 17 and 21, respectively. Then, an unmagnetized permanent magnet may be magnetized.
Further, prior to being held in the first and second magnet folders 33 and 43, an unmagnetized permanent magnet may be oriented by applying an orientation process to the unmagnetized permanent magnet. In this case, even when the first and second magnet folders 33 and 43 are held in the first and second magnet folder holding holes 31 and 41 of the first and second pole core bodies 17 and 21, the permanent magnet magnetization process is performed. Becomes simple.

  In the first embodiment, the hole centers of the first and second magnet folder holding holes coincide with the axial direction, but the hole centers of the first and second magnet folder holding holes are not necessarily axial. Does not need to match exactly. For example, the hole centers of the first and second magnet folder holding holes may be inclined with respect to the axial direction so as to be parallel to the tip side inner peripheral surfaces of the second and first claw-shaped magnetic pole portions. In this case, even if the first and second permanent magnets are columnar bodies having a trapezoidal cross section, there is a gap between the upper surfaces of the first and second permanent magnets and the inner peripheral surfaces of the distal ends of the second and first claw-shaped magnetic pole portions. , Uniform in the axial direction. Thus, the fact that the hole centers of the first and second magnet folder holding holes coincide with the axial direction includes the case where the hole centers are slightly inclined with respect to the axial direction.

Embodiment 2. FIG.
FIG. 7 is a perspective view showing a state in which a permanent magnet is mounted in a magnet folder in an automotive alternator according to Embodiment 2 of the present invention.

  In FIG. 7, the permanent magnet 61 is produced in a columnar body having a square cross section. The wedge member 62 is made of a non-magnetic metal such as stainless steel or a non-magnetic material such as polyphenylene sulfide (PPS) resin into a columnar body having a right triangle. And the wedge member 62 is arrange | positioned at the both sides of the permanent magnet 61, and comprises the columnar body of a cross-sectional trapezoid. The magnet cover 63 is a flat plate made of a nonmagnetic material such as stainless steel, and is bent at the corners of a columnar body having a trapezoidal cross section composed of a permanent magnet 61 and a wedge member 62 so that the top surface, bottom surface, and both side surfaces of the columnar body are formed. The permanent magnet 61 and the wedge member 62 are integrated so as to be covered. The magnet module 60 configured in this manner is fitted into the magnet fitting groove 36 from the outside in the thickness direction of the first magnet folder 33 and is attached to the first magnet folder 33.

  Although not shown, the magnet module 60 is fitted into the second magnet folder 43 by being fitted into the magnet fitting groove 46 from the outside in the thickness direction of the second magnet folder 43. The magnetization orientation direction of the permanent magnet 61 incorporated in the magnet module 60 attached to the second magnet folder 43 is opposite to the permanent magnet 61 incorporated in the magnet module 60 attached to the first magnet folder 33. It has become.

In the second embodiment, since the permanent magnet 61 is formed into a columnar body having a square cross section, the shape processing of the magnet can be further simplified, and the mass productivity and yield of the magnet can be improved.
Further, the magnet module 60 is configured by arranging wedge members 62 formed in a columnar body having a right-angled triangle cross section on both sides of the permanent magnet 61 and winding a magnet cover 63, so that the first and second magnet folders 33 and 43 The magnets are fitted in the magnet fitting grooves 36 and 46. Therefore, the movement of the permanent magnet 61 and the wedge member 62 is restrained by the magnet cover 63. Further, when the centrifugal force acts, the wedge member 62 sandwiches the permanent magnet 61 by the wedge effect, and the movement of the permanent magnet 61 is restrained. Thus, the permanent magnet 61 is prevented from popping out due to the centrifugal force.

Further, since the permanent magnet 61 is covered with the magnet cover 63, the permanent magnet 61 will be cracked or chipped even if vibrations from the automobile engine are applied to the vehicle alternator or even foreign objects come in. Is suppressed.
Further, since the non-magnetic wedge members 62 are arranged on both sides of the permanent magnet 61, the wedge members 62 become magnetic gaps, the leakage magnetic flux 64 can be suppressed, and the amount of interlinkage magnetic flux of the stator coil 4 is increased. The Thus, the magnetomotive force of the permanent magnet 61 can be used effectively, and the power generation output can be increased.

  In the second embodiment, the magnet cover is mounted so as to cover the upper surface, the bottom surface, and both side surfaces of the columnar body having a trapezoidal cross section composed of a permanent magnet and a wedge member. It is only necessary to obtain a fitting force capable of preventing the permanent magnet from popping out due to centrifugal force when it is mounted on a columnar body having a trapezoidal cross section composed of a magnet and a wedge member and fitted in the magnet fitting groove. You may mount so that the upper surface of a trapezoidal columnar body which consists of a permanent magnet and a wedge member, and both sides may be covered.

Embodiment 3 FIG.
8 is a perspective view for explaining a method of assembling a magnet assembly in an automotive alternator according to Embodiment 3 of the present invention, and FIG. 9 is a view showing mounting of the magnet assembly of an automotive alternator according to Embodiment 3 of the present invention. FIG. 10 is a cross-sectional view showing a previous state, and FIG. 10 is a cross-sectional view showing a state after mounting a magnet assembly of a vehicle AC generator according to Embodiment 3 of the present invention.

  In FIG. 8, the permanent magnet 71 is formed in a columnar body having a trapezoidal cross section. The magnet folder 72 is formed by laminating magnetic thin plates punched into a predetermined shape and integrated by caulking or the like. The magnet folder 72 is fitted into the first and second magnet folder holding holes 31, 41. A projecting portion 74 extending from the joint portion 73, a magnet fitting groove 75 recessed in the distal end surface of the projecting portion 74, and a through hole 76 penetrating the fitting portion 73 in the stacking direction are provided. The magnet cover 77 is made by press-molding a nonmagnetic metal plate such as stainless steel, and covers the permanent magnet 71 fitted in the magnet fitting groove 75 in the stacking direction of the magnet folder 72 from the crown 78. A flange portion 79 extending so as to cover both end faces and a through hole 80 formed in the flange portion 79 are provided.

8A, the permanent magnet 71 is fitted into the magnet fitting groove 75 from the stacking direction, and the magnet cover 77 is attached to the magnet folder 72 so as to wrap the permanent magnet 71 at the crown portion 78. As shown in FIG. Is done.
Next, as shown in FIG. 8B, the fixing pin 81 is inserted into the through holes 80 and 76 of the magnet cover 77 and the magnet folder 72 from the stacking direction. And the front-end | tip of the fixing pin 81 extended from the through holes 80 and 76 is crimped. Thereby, as shown in FIG. 8C, the collar portion 79 and the magnet folder 72 of the magnet cover 77 are pressed and clamped between the head portion 81a of the fixing pin 81 and the caulking portion 81b (not shown). As a result, the magnet assembly 70 is assembled.

  In FIG. 9, the first and second pole core bodies 17A, 21A have a larger distance between the first and second yoke portions 19, 23 than the first and second pole core bodies 17, 21 in the first embodiment. Thus, the first and second yoke portions 19 and 23 are displaced outward in the axial direction. The first and second magnet holding bases 30 and 40 are positioned axially outward with respect to the tip surfaces of the second and first claw-shaped magnetic pole portions 24 and 20. In the rotor 13A configured in this way, the winding width of the field coil 14 is widened, and the number of turns of the field coil 14 is increased. Thereby, the magnetomotive force of the field coil 14 increases, and the power generation output can be increased.

  In FIG. 10, the magnet assembly 70 is inserted into the second magnet folder holding hole 41 from the fitting portion 73 of the magnet folder 72 in the axial direction, and is extended and held from the second magnet holding base 40 to the field coil 14 side. The And the permanent magnet 71 is arrange | positioned adjacent to the front end side inner peripheral surface of the 1st nail | claw-shaped magnetic pole part 20. As shown in FIG. Similarly, the magnet assembly 70 is inserted and held in the first magnet folder holding hole 31. At this time, the permanent magnet 71 whose magnetization orientation direction is reverse is incorporated in the magnet assembly 70 held in the first magnet folder holding hole 31.

  In the third embodiment, the magnet folder 72 extends from the second magnet folder holding hole 41 to the field coil 14 side, and the magnet folder 72 is moved to the first position by the fitting force between the fitting portion 73 and the second magnet folder holding hole 41. Two magnets are held on a pedestal 40. Therefore, in the region fitted in the second magnet folder holding hole 41 of the magnet folder 72, there is a magnetic path from the permanent magnet 71 to the second yoke portion 23 via the magnet folder 72 and the second magnet holding base 40. It is formed. Further, in the region extending from the second magnet folder holding hole 41 of the magnet folder 72, a magnetic path from the permanent magnet 71 to the second yoke portion 23 via the magnet folder 72 is formed. At this time, if the fixing pin 81 is made of a magnetic material, the magnet extending from the permanent magnet 71 to the second yoke portion 23 via the magnet folder 72, the fixing pin 81, the magnet folder 72, and the second magnet holding base 40. A path is formed.

  Therefore, it is preferable that the fixing pin 81 is made of a magnetic material from the viewpoint of securing a magnetic path. If the fixing pin 81 is made of a magnetic material, the region extending from the second magnet folder holding hole 41 of the magnet folder 72 is not necessarily magnetically connected to the outer peripheral surface of the second yoke portion. There is no need to be. The same applies to the first pole core body 17.

According to the third embodiment, in addition to the fitting force between the fixing pin 81 and the through hole 76, the pressure clamping force by the head 81 a and the crimping portion of the fixing pin 81 acts on the magnet folder 72. Therefore, a large number of laminated magnetic thin plates are firmly integrated.
Further, since the permanent magnet 71 is included in the crown portion 78 of the magnet cover 77, the occurrence of damage to the permanent magnet 71 due to vibrations from the engine and the arrival of foreign matter can be suppressed, and the permanent magnet 71 due to centrifugal force can be suppressed. Can be reliably prevented from popping out.

  A magnet folder 72 extends from the first and second magnet folder holding holes 31 and 41 to the field coil 14 side and is held by the first and second magnet holding bases 30 and 40. Therefore, even when the first and second magnet folder holding holes 31 and 41 are displaced outward in the axial direction, the extension length of the magnet folder 72 from the first and second magnet folder holding holes 31 and 41 is increased. By doing so, a predetermined clearance can be secured between the opposing second and first claw-shaped magnetic pole portions 24, 20 and the inner peripheral surfaces on the front end side.

Embodiment 4 FIG.
FIG. 11 is a perspective view for explaining a method for assembling a magnet assembly in an automotive alternator according to Embodiment 4 of the present invention, and FIG. 12 is a perspective view of the magnet assembly in the automotive alternator according to Embodiment 4 of the present invention. FIG. 13 is a cross-sectional view illustrating a mounting state of a magnet assembly of an automotive alternator according to Embodiment 4 of the present invention.

  In FIG. 11, the permanent magnet 71 is formed into a columnar body having a trapezoidal cross section. The magnet folder 91 is formed by laminating a plurality of magnetic thin plates punched into an outer shape conforming to the concave shape of the claw crotch portion between the first claw-shaped magnetic pole portions 24 (first claw-shaped magnetic pole portions 20) adjacent in the circumferential direction. In addition, a base 92 that is integrally formed by caulking or the like, a magnet fitting groove 93 that is recessed in the upper surface of the base 92, and a through hole 94 that penetrates the base 92 in the stacking direction are provided. The magnet cover 95 is manufactured by press-molding a nonmagnetic metal plate such as stainless steel, and covers the permanent magnet 71 fitted in the magnet fitting groove 93, and the direction from the crown portion 96 to the magnet folder 91 in the stacking direction. A flange 97 extending so as to cover both end faces, and a through hole 98 formed in the flange 97 are provided.

  11A, the permanent magnet 71 is fitted in the magnet fitting groove 93 from the stacking direction, and the magnet cover 95 is attached to the magnet folder 91 so as to wrap the permanent magnet 71 with the crown portion 96. As shown in FIG. Is done. Thereby, as shown in FIG. 11B, the magnet assembly 90 is assembled.

A mounting method of the magnet assembly 90 configured as described above to the pole core body will be described with reference to FIGS.
First, the support pin 100 is coaxially connected to one end of the first shaft portion 101 and the first shaft portion 101 having an outer diameter to be fitted into the second magnet folder holding hole 41, and is fitted into the through hole 94. A second shaft portion 102 as a first extending portion and a head portion 103 as a flange portion formed at the other end of the first shaft portion 101. Here, the outer diameter of the first shaft portion 101 is larger than the outer diameter of the second shaft portion 102.

  Then, the first shaft portion 101 of the support pin 100 is inserted into the second magnet folder holding hole 41 from the outside in the axial direction until the head portion 103 comes into contact with the end face of the second pole core body 21A. As a result, the support pin 100 is held by the second magnet holding base 40 by the fitting force between the first shaft portion 101 and the second magnet folder holding hole 41, and the second shaft portion 102 extends from the second magnet folder holding hole 41. Put out. Next, the second shaft portion 102 is pushed into the through holes 98 and 94 of the magnet assembly 90 from the axially inner side (the field coil 14 side). And the edge part of the 2nd axial part 102 extended from the through holes 98 and 94 is crimped. As a result, as shown in FIG. 13, the flange portion 97 and the magnet folder 91 of the magnet cover 95 are press-clamped and integrated between the end surface of the first shaft portion 101 of the support pin 100 and the caulking portion 104. The magnet assembly 90 is mounted on the second pole core body 21A.

  Similarly, the magnet assembly 90 is mounted on the first pole core body 17A. At this time, the permanent magnet 71 whose magnetizing orientation direction is reverse is incorporated in the magnet assembly 90 mounted on the first pole core body 17A.

  In the fourth embodiment, the support pin 100 is fitted into the second magnet folder holding hole 41 and held by the second magnet holding base 40, and the magnet assembly 90 is moved from the second magnet folder holding hole 41 to the field coil 14 side. The support pin 100 extended to the second shaft portion 102 is fitted and supported. Therefore, a magnetic path from the permanent magnet 71 to the second yoke portion 23 via the magnet folder 91 is formed. At this time, if the support pin 100 is made of a magnetic material, a magnetic path is formed from the permanent magnet 71 to the second yoke portion 23 via the magnet folder 91, the support pin 100, and the second magnet holding base 40. The

  Therefore, it is preferable that the support pin 100 is made of a magnetic material from the viewpoint of securing a magnetic path. If the support pin 100 is made of a magnetic material, the magnet folder 91 does not necessarily have to be magnetically connected to the outer peripheral surface of the second yoke portion 23. The same applies to the first pole core body 17A.

According to the fourth embodiment, in addition to the fitting force between the second shaft portion 102 of the support pin 100 and the through hole 94, the applied force by the end surface of the first shaft portion 101 of the support pin 100 and the caulking portion 103 is added. Since the pressing force acts on the magnet folder 91, a large number of laminated magnetic thin plates are firmly integrated.
In addition, since the permanent magnet 71 is included in the crown portion 96 of the magnet cover 95, the occurrence of damage to the permanent magnet 71 due to engine vibration or foreign object flying can be suppressed, and the permanent magnet 71 due to centrifugal force can be suppressed. Can be reliably prevented from popping out.

  A magnet folder 91 is disposed on the field coil 14 side of the first and second magnet holding bases 30 and 40. Therefore, even when the first and second magnet folder holding holes 31 and 41 are displaced outward in the axial direction, the opposing second and first claw-shaped magnetic pole portions can be obtained by increasing the lamination thickness of the magnet folder 91. A predetermined gap can be ensured between the distal end side inner peripheral surfaces of 24 and 20.

  Further, the first shaft portion 101 of the support pin 100 is fitted into the second magnet folder holding hole 41, and the head portion 103 of the support pin 100 is in contact with the end face of the second pole core body 21A. Therefore, the radially outward moving force acting on the magnet folder 91 due to the centrifugal force is a fitting portion between the first shaft portion 101 and the second magnet folder holding hole 41, and the head portion 103 and the second pole core body 21A. And the displacement of the magnet folder 91 outward in the radial direction is suppressed.

In the third and fourth embodiments, the permanent magnet produced in the trapezoidal columnar section is fitted into the magnet holding groove. However, the non-magnetic wedge member having a right-angled triangular section is formed in a columnar columnar section. A columnar body having a trapezoidal cross section arranged on both sides of a permanent magnet produced on the body may be fitted into the magnet holding groove. In this case, since the magnet cover is attached so as to cover the columnar body having a trapezoidal cross section fitted in the magnet holding groove, the permanent magnet is prevented from popping out.
In the fourth embodiment, the first and second magnet folder holding holes are formed in a circular arc shape with a C-shaped cross section. However, the first and second magnet folder holding holes are used. The hole may be formed in a hole shape having a circular cross section.

  In each of the above embodiments, the first magnet folder with the first permanent magnet is disposed between each of the first claw-shaped magnetic pole portions adjacent in the circumferential direction, and the second permanent magnet is attached. It is assumed that the magnet folders are respectively disposed between the second claw-shaped magnetic pole portions adjacent in the circumferential direction. However, it is not necessary to arrange the first and second permanent magnets between the adjacent first and second claw-shaped magnetic pole portions, and the number of the first and second permanent magnets to be provided is required performance and cost. It may be selected as appropriate in consideration. In this case, the number of the first and second permanent magnets arranged is a divisor excluding one of the number of the first and second claw-shaped magnetic pole portions so as not to cause a heavy imbalance with respect to the centrifugal force. And it is preferable to arrange | position by the equiangular pitch in the circumferential direction. At this time, the first and second magnet folders to which the first and second permanent magnets are attached may be disposed only between the selected adjacent claw-shaped magnetic pole portions, or the first and second magnet folders may be disposed. The first and second permanent magnets may be mounted only on the selected first and second magnet folders, provided between all the adjacent claw-shaped magnetic pole portions.

  In each of the above embodiments, since the number of first and second claw-shaped magnetic pole portions is eight, the number of first and second permanent magnets to be arranged is 2, 4, or 8 from the required performance. The cost will be selected as appropriate. When the number of the first and second permanent magnets is four, each of the first and second permanent magnets has an equiangular pitch of 90 degrees and each of the second and first claw-shaped magnetic pole portions. It arrange | positions so as to oppose the front end side inner peripheral surface.

  In the above embodiments, the materials of the first and second permanent magnets are not described, but a large space for disposing the permanent magnets cannot be secured from the Landel rotor structure. Therefore, in order to obtain a sufficient magnetic saturation relaxation effect with a small-volume magnet, it is preferable to use an anisotropic sintered rare earth magnet having an energy product BHMAX of 30 MGOe or more.

  In each of the above embodiments, the vehicle alternator has been described. However, the present invention is not limited to the vehicle alternator, and is applied to rotating electric machines such as a vehicle motor and a vehicle generator motor. Produces the same effect.

  Moreover, in each said embodiment, although the protrusion part of the 1st and 2nd magnet folder shall be formed in the cross-sectional trapezoid, the cross section of a protrusion part is not limited to a trapezoid, A cross section is square or It may be a rectangular quadrilateral. Needless to say, chamfering or rounding may be applied to the corners of the rectangular cross section.

  In each of the above embodiments, the first and second magnet folders are formed by laminating a predetermined number of magnetic thin plates, but the first and second magnet folders are integrally formed of a lump of magnetic material. You may produce as a thing.

  DESCRIPTION OF SYMBOLS 10 Stator, 13 Rotor, 14 Field coil, 15 Pole core, 16 Shaft, 17 1st pole core body, 18 1st boss | hub part, 19 1st yoke part, 20 1st claw-shaped magnetic pole part, 21 2nd pole core Body, 22 second boss part, 23 second yoke part, 24 second claw-shaped magnetic pole part, 29 air gap, 30 first magnet holding base (permanent magnet holding part), 31 first magnet folder holding hole, 32 first 1 axial opening, 33 1st magnet folder, 34 fitting part, 35 protrusion part, 36 magnet fitting groove, 37 1st permanent magnet, 40 2nd magnet holding base (permanent magnet holding part), 41 2nd magnet folder Holding hole, 42 Second axial opening, 43 Second magnet folder, 44 Fitting part, 45 Protruding part, 46 Magnet fitting groove, 47 Second permanent magnet, 48, 49 Magnetic thin plate, 60 Magnet module, 61 Permanent magnet 62 Wedge member, 63 Magnet cover, 71 Permanent magnet, 72 Magnet folder, 73 Fitting portion, 74 Protruding portion, 75 Magnet fitting groove, 81 Support pin, 91 Magnet folder, 100 Support pin, 101 First shaft portion, 102 2nd axis | shaft part (1st extension part), 103 head (saddle part).

Claims (10)

A boss portion, a pair of yoke portions extending radially outward from both end edges in the axial direction of the boss portion, and a pair of yoke portions alternately extending in the axial direction from each of the yoke portions, meshing with each other. A pole core that has a plurality of claw-shaped magnetic pole portions arranged in a direction and is fixed to a shaft that is inserted through an axial center of the boss portion; the boss portion; the pair of yoke portions; and the plurality of claws A rotor having a field coil housed in a space surrounded by a magnetic pole portion,
In a rotating electrical machine comprising: a stator disposed so as to surround an outer periphery of the rotor via a predetermined air gap;
A permanent magnet holding portion integrally projecting from the yoke portion at a portion of the pair of yoke portions facing the inner peripheral surface on the tip side of the plurality of claw-shaped magnetic pole portions;
Each of the permanent magnet holders has a hole center that coincides with the axial direction, penetrates from one end in the axial direction to the other end, and opens radially outward across the entire region from one end to the other end in the axial direction. A magnet folder holding hole formed in a circular arc shape with a C-shaped cross section perpendicular to the hole center;
A fitting portion that is inserted and held in the magnet folder holding hole and has a C-shaped arcuate outer shape, and a magnet projecting radially outward from the fitting portion. A magnet folder made of a magnetic material having a protrusion protruding radially outward from the folder holding hole;
A permanent magnet having a cross-section formed into a quadrangular columnar body and attached to the protruding portion of the magnet folder and magnetized and oriented in a direction opposite to the direction of the magnetic field formed by the field coil. Rotating electric machine. The projecting portion is formed in an outer shape whose circumferential width gradually increases from the arcuate chord portion having a C-shaped cross section of the fitting portion toward the outside in the radial direction,
A magnet fitting groove is provided in a groove shape in which the groove direction coincides with the axial direction on the radially outer peripheral surface of the protruding portion, and the groove width gradually narrows radially outward.
The rotating electric machine according to claim 1, wherein the permanent magnet is a columnar body having a trapezoidal cross section, and is fitted into the magnet fitting groove and attached to the protruding portion. The projecting portion is formed in an outer shape whose circumferential width gradually increases from the arcuate chord portion having a C-shaped cross section of the fitting portion toward the outside in the radial direction,
A magnet fitting groove is provided in a groove shape in which the groove direction coincides with the axial direction on the radially outer peripheral surface of the protruding portion, and the groove width gradually narrows radially outward.
The permanent magnet is made of a columnar body having a square cross section, and is covered with a magnet cover together with a nonmagnetic wedge member made of a columnar body having a right-angled triangular section disposed on both sides of the permanent magnet. Composed of magnet modules,
The rotating electrical machine according to claim 1, wherein the magnet module is fitted into the magnet fitting groove and attached to the protruding portion.   The rotating electric machine according to any one of claims 1 to 3, wherein the magnet folder is manufactured by laminating a plurality of magnetic thin plates.   5. The rotating electrical machine according to claim 4, wherein the plurality of magnetic thin plates are integrated by a fixing pin inserted in the laminating direction of the magnetic thin plates.   6. The rotating electrical machine according to claim 5, wherein the fixing pin is made of a magnetic material. A boss portion, a pair of yoke portions extending radially outward from both end edges in the axial direction of the boss portion, and a pair of yoke portions alternately extending in the axial direction from each of the yoke portions, meshing with each other. A pole core that has a plurality of claw-shaped magnetic pole portions arranged in a direction and is fixed to a shaft that is inserted through an axial center of the boss portion; the boss portion; the pair of yoke portions; and the plurality of claws A rotor having a field coil housed in a space surrounded by a magnetic pole portion,
In a rotating electrical machine comprising: a stator disposed so as to surround an outer periphery of the rotor via a predetermined air gap;
A permanent magnet holding portion integrally projecting from the yoke portion at a portion of the pair of yoke portions facing the inner peripheral surface on the tip side of the plurality of claw-shaped magnetic pole portions;
Each of the permanent magnet holders has a hole center that coincides with the axial direction, penetrates from one end in the axial direction to the other end, and opens radially outward across the entire region from one end to the other end in the axial direction. A magnet folder holding hole in which a cross section perpendicular to the hole center is formed in a C-shaped arc shape or a circular hole shape;
A support pin that is fitted and held in the magnet folder holding hole and extends to the field coil side;
A first extension portion of the support pin extending from the magnet folder holding hole to the field coil side is mounted in an externally fitted state, and is disposed relative to the inner peripheral surface on the tip side of the claw-shaped magnetic pole portion. Magnet folder made of magnetic material,
The cross-section is made into a quadrangular columnar body, attached to the magnet folder so as to face the inner peripheral surface on the tip side of the claw-shaped magnetic pole part, and magnetized and oriented in the direction opposite to the direction of the magnetic field formed by the field coil. And a permanent magnet.   8. The rotating electrical machine according to claim 7, wherein the magnet folder is formed by integrating a plurality of magnetic thin plates with the support pins.   The support pin further includes a second extension portion extending from the magnet folder holding hole to the opposite side of the field coil, and a flange portion provided at an extension end of the second extension portion, The rotating electrical machine according to claim 7 or 8, wherein the flange portion is in contact with an end face in the axial direction of the pole core.   The rotating electrical machine according to any one of claims 7 to 9, wherein the support pin is made of a magnetic material.

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