JP5312061B2 - Rotating electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a rotary electric machine in which effects of displacement of claw-like magnetic poles due to a centrifugal force are eliminated, the centrifugal force acting on permanent magnets is received by magnet protecting covers welded to yokes or magnet pedestal members and which stably holds the permanent magnets for a long period of time with a simple magnet holding structure without excessively enhancing the accuracy of machining the permanent magnets and the yokes. <P>SOLUTION: First/second permanent magnets 30, 35 are respectively covered with each cap-like fitting part of first/second magnet protecting covers 31, 36 and arranged while their lower surfaces are brought close to first/second claw fork parts between first/second claw-like magnetic poles of first/second yokes 19, 23. Each mounting arm extending from each cap-like fitting part of the first/second magnet protecting covers 31, 36 is fixed to axial both end faces of the first/second yokes 19, 23 by welding. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a rotating electrical machine such as a vehicular AC generator, and more particularly to a Landell type rotor structure equipped with a permanent magnet.

  Due to environmental problems in recent years, the load of electrical components mounted on the vehicle has increased rapidly, and further increase in the power generation amount of the Landel rotor has been demanded. If it is going to respond to this request in the conventional design range, the alternator becomes large, which increases the weight and arrangement space of the alternator, which is not preferable. In addition, an increase in the size of the alternator leads to an increase in rotor inertia, which causes a new problem in which fluctuations in the speed of the engine interact with the inertia torque of the alternator, causing belt vibration and slippage. It has been known. For these reasons, it is required to increase the capacity of the alternator without increasing the size of the alternator body, that is, to reduce the size of the alternator and to increase the output.

In view of such a situation, a first conventional AC generator in which a permanent magnet is disposed between claw-shaped magnetic pole portions adjacent to each other in the circumferential direction of a Landel rotor has been proposed (see, for example, Patent Document 1). ).
In addition, the permanent magnet is disposed on the peripheral mounting surface located between the magnetic pole fingers (claw-shaped magnetic pole portions) of the magnetic pole piece (the yoke portion), and the strap is disposed so as to cover the permanent magnet and is attached to the yoke portion by the nail. A fixed second conventional AC generator has been proposed (for example, see Patent Document 2).

US Pat. No. 4,959,577 JP 2004-153994 A

The vehicular AC generator is driven by the rotational force of the engine transmitted through a belt and a pulley, and rotates at a maximum speed of about 18,000 to 20,000 rpm. Therefore, even if a small magnet of about several grams per pole is disposed, an extremely large centrifugal force exceeding several tens Kgf is applied to the magnet.
Further, a large centrifugal force acts on the claw-shaped magnetic pole portion even when the permanent magnet is not held, and the tip portion swells to the outer peripheral side by about 50 to 100 μm. As the engine speed increases or decreases, the claw-shaped magnetic pole portion is displaced to flutter. Since the claw-shaped magnetic pole part has a cantilever structure, the displacement increases on the tip side and decreases on the root side, and the relative distance between the claw-shaped magnetic pole parts adjacent in the circumferential direction also changes.

Therefore, in the first conventional AC generator in which the permanent magnet is disposed between the claw-shaped magnetic pole parts adjacent in the circumferential direction, the displacement of the claw-shaped magnetic pole part due to the centrifugal force is added to the magnet holding structure in addition to the centrifugal force. There exists a subject that it acts and cannot hold a permanent magnet stably for a long term.
In the second conventional AC generator, since the permanent magnet is disposed between the claw-shaped magnetic pole portions of the yoke portion, the displacement of the claw-shaped magnetic pole portion due to centrifugal force does not act on the magnet holding structure. In addition, because the permanent magnet is fixed to the yoke part using a strap, initially, the permanent magnet is difficult to machine the outer shape with high accuracy, and the yoke part is difficult to machine the magnet holding part with high accuracy. Can be held firmly. However, since the strap that holds the permanent magnet is fixed to the yoke part by the nail, the stress due to the centrifugal force acting on the magnet holding structure is concentrated on the fixing point between the strap and the yoke part by the nail, and There is a problem that damage is likely to occur and the permanent magnet cannot be stably held for a long time.

  The present invention has been made in order to solve such problems, and a magnet provided with a mounting arm of a magnet protective cover over a permanent magnet disposed on a claw crotch portion or a claw crotch portion of a yoke portion The permanent magnet is welded to the yoke part or magnet pedestal member by welding to the pedestal member, the influence of the displacement of the claw-shaped magnetic pole part due to centrifugal force is eliminated, and the centrifugal force acting on the permanent magnet is subjected to the yoke part or magnet pedestal. A rotating electrical machine that can be held by a magnet protective cover welded to a member and can stably hold a permanent magnet for a long period of time with a simple magnet holding structure without excessively increasing the processing accuracy of the permanent magnet and the yoke part. The purpose is to obtain.

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, the rotating electrical machine has at least one of the claw claw portions of the yoke portion facing the inner peripheral surface of the tip of the claw-shaped magnetic pole portion, opposed to the inner peripheral surface of the tip of the claw-shaped magnetic pole portion, and has a lower surface. A permanent magnet disposed in intimate contact with the claw crotch portion of the yoke portion, and a box-shaped crown portion that is placed on the permanent magnet so as to cover at least the upper surface side of the upper surface and all side surfaces of the permanent magnet; And a metallic magnet protective cover having attachment arms extending downward from both sides in the axial direction of the crown portion and welded to both end surfaces in the axial direction of the yoke portion. And the fitting groove is recessedly provided in the inner shape that matches the outer shape of the mounting arm on both axial end surfaces of the yoke part, and the mounting arm is fitted in the fitting groove. The permanent magnet is welded to the yoke portion and the permanent magnet is positioned with respect to the claw crotch portion of the yoke portion.

  According to the present invention, the permanent magnet is held on the claw crotch portion of the yoke portion by welding the mounting arm of the magnet protection cover that is put on the permanent magnet to both end surfaces in the axial direction of the yoke portion. Therefore, the displacement of the claw-shaped magnetic pole portion due to the centrifugal force does not act on the magnet protective cover and the permanent magnet, and the permanent magnet can be stably held for a long time. Moreover, the attachment strength of the magnet protective cover is increased, and the permanent magnet can be stably held for a long time. Furthermore, it is not necessary to excessively increase the processing accuracy of the permanent magnet and the magnet holding portion of the yoke portion, and the manufacturing cost can be reduced.

Moreover, since the magnet protective cover is welded to the yoke part, it is possible to prevent the centrifugal force from concentrating on the welded part between the magnet protective cover and the yoke part and damaging the yoke part. It can be held stably for a long time.
Further, since the upper surface of the permanent magnet and at least the upper surface side of all the side surfaces are covered with the crowning portion of the magnet protective cover, the occurrence of damage to the permanent magnet due to the flying of foreign matter can be suppressed.
In addition, since the mounting arms extending from the crown of the magnet protective cover are welded to both end faces in the axial direction of the yoke part, the welding position between the mounting arm and the yoke part can be separated from the permanent magnet. The thermal demagnetization of the permanent magnet due to welding can be suppressed.

It is a longitudinal cross-sectional view which shows typically the alternating current generator for vehicles which concerns on Embodiment 1 of this invention. It is an end view which shows the pole core body of the rotor applied to 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 permanent magnet of the magnet protection cover in the alternating current generator for vehicles concerning Embodiment 1 of this invention. It is an end elevation which shows the state which mounted the permanent magnet in the pole core body in the alternating current generator for vehicles which concerns on Embodiment 1 of this invention. It is an end elevation which shows the pole core body of the rotor applied to the alternating current generator for vehicles concerning Embodiment 2 of this invention. It is an end elevation which shows the pole core body of the rotor applied to the alternating current generator for vehicles concerning Embodiment 3 of this invention. It is a perspective view explaining the mounting method to the permanent magnet of the magnet protection cover in the alternating current generator for vehicles concerning Embodiment 3 of this invention. It is an end elevation which shows the state which mounted the permanent magnet in the pole core body in the alternating current generator for vehicles concerning Embodiment 3 of this invention. It is an end elevation which shows the pole core body of the rotor applied to the alternating current generator for vehicles concerning Embodiment 4 of this invention. It is a perspective view explaining the mounting method to the permanent magnet of the magnet protection cover in the alternating current generator for vehicles concerning Embodiment 4 of this invention. It is an end elevation which shows the state which mounted the permanent magnet in the pole core body in the alternating current generator for vehicles concerning Embodiment 4 of this invention. It is a perspective view which shows the pole core body of the rotor applied to the alternating current generator for vehicles concerning Embodiment 5 of this invention. It is a perspective view explaining the mounting method to the magnet base member of the permanent magnet in the alternating current generator for vehicles concerning Embodiment 5 of this invention. It is a perspective view which shows the state which mounted the permanent magnet with which the magnet protection cover was mounted in the alternating current generator for vehicles concerning Embodiment 5 of this invention in the magnet base member. It is an end elevation which shows the state which mounted the permanent magnet in the pole core body in the alternating current generator for vehicles concerning Embodiment 5 of this invention. It is a perspective view which shows the pole core body of the rotor applied to the alternating current generator for vehicles concerning Embodiment 6 of this invention. It is a perspective view explaining the mounting method to the magnet base member of the permanent magnet in the alternating current generator for vehicles concerning Embodiment 7 of this invention. It is a perspective view which shows the state which mounted the permanent magnet with which the magnet protection cover was mounted | worn in the alternating current generator for vehicles concerning Embodiment 7 of this invention to the magnet base member. It is a perspective view explaining the mounting method to the magnet base member of the permanent magnet in the alternating current generator for vehicles concerning Embodiment 8 of this invention. It is a perspective view which shows the state which mounted the permanent magnet with which the magnet protection cover was mounted in the alternating current generator for vehicles concerning Embodiment 8 of this invention to the magnet base member.

Embodiment 1 FIG.
1 is a longitudinal sectional view schematically showing an automotive alternator according to Embodiment 1 of the present invention, and FIG. 2 is a view of a rotor applied to the automotive alternator according to Embodiment 1 of the present invention. 3 is an end view showing the pole core body, FIG. 3 is a perspective view for explaining a method of mounting the magnet protective cover on the permanent magnet in the automotive alternator according to Embodiment 1 of the present invention, and FIG. 4 is an embodiment of the present invention. 1 is an end view showing a state in which a permanent magnet is mounted on a pole core body in an automotive alternator according to FIG.

  1 to 4, an AC generator 1 for a vehicle is supported by a case 4 including a substantially bracket-shaped aluminum front bracket 2 and a rear bracket 3 and a shaft 16 on the case 4 via a bearing 5. The rotor 13 rotatably disposed 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 end surfaces of the rotor 13 A fixed fan 7 and a fixed air gap 29 with respect to the rotor 13, a stator 10 that surrounds the outer periphery of the rotor 13 and is fixed to the case 4, and is fixed to the rear side of the shaft 16. A pair of slip rings 8 for 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. A portion between the first claw-shaped magnetic pole portions 20 adjacent to each other in the circumferential direction of the first yoke portion 19 is a first claw crotch portion 25.

  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. A portion between the second claw-shaped magnetic pole portions 24 adjacent to each other in the circumferential direction of the second yoke portion 23 is a second claw crotch portion 26.

  Thus, the 1st and 2nd pole core bodies 17 and 21 are produced by the same shape, mesh | engage the 1st and 2nd claw-shaped magnetic pole parts 20 and 24 alternately, and the other end surface of the 1st boss | hub part 18 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. Further, in the axial direction, the distal end sides of the first and second claw-shaped magnetic pole portions 20 and 24 overlap the second and first yoke portions 23 and 19, respectively. The first and second claw crotch portions 25 and 26 are opposed to the inner peripheral surfaces of the tips of the second and first claw-shaped magnetic pole portions 24 and 20, respectively.

The first permanent magnet 30 is formed in a rectangular parallelepiped.
The first magnet protective cover 31 is manufactured, for example, by deep-drawing stainless steel having magnetism, and has an inner shape substantially the same as the outer shape of the first permanent magnet 30, and is manufactured in a box shape with one side opened. And a mounting arm 33 extending from two opposite sides of the crown 32 with the same arm width as the width of the side.

  The first permanent magnet 30 is placed on the upper surface of the first claw crotch portion 25 of the first yoke portion 19 with the crown portion 32 covered from above. At this time, the attachment arm 33 extends from the upper surface of the first claw crotch portion 25 of the first yoke portion 19 toward the inner diameter side. And the front-end edge part of the attachment arm 33 is welded to the both end surfaces of the 1st yoke part 19 in the axial direction, pressing the 1st magnet protection cover 31 to an internal diameter side. Thereby, the 1st permanent magnet 30 is attached to the 1st yoke part 19 in the fixed state in the state which closely contacted the lower surface with the upper surface of the 1st claw crotch part 25 of the 1st yoke part 19. As shown in FIG. The upper surface and four side surfaces of the first permanent magnet 30 are completely covered with the crown portion 32. Further, in the assembled state as the rotor 13, the upper surface of the first permanent magnet 30 faces the inner peripheral surface of the distal end side of the second claw-shaped magnetic pole portion 24 with a predetermined gap through the crown portion 32. ing.

The 2nd permanent magnet 35 is produced in the rectangular parallelepiped.
The second magnet protective cover 36 is manufactured, for example, by deep-drawing stainless steel having magnetism, and has an inner shape substantially the same as the outer shape of the second permanent magnet 35, and is manufactured in a box shape with one side opened. And a mounting arm 38 extending from two opposite sides of the crown 37 with the same arm width as the width of the side. The second permanent magnet 35 and the second magnet protective cover 36 are made in the same shape as the first permanent magnet 30 and the first magnet protective cover 31.

  Then, the second permanent magnet 35 is placed on the upper surface of the second claw crotch portion 26 of the second yoke portion 23 with the crown portion 37 covered from above. At this time, the attachment arm 38 extends from the upper surface of the second claw crotch portion 26 of the second yoke portion 23 toward the inner diameter side. Then, the front edge portion of the mounting arm 38 is welded to both end surfaces of the second yoke portion 23 in the axial direction while pressing the second magnet protective cover 36 toward the inner diameter side. Thereby, the 2nd permanent magnet 35 is attached to the 2nd yoke part 23 in the fixed state in the state which contacted the lower surface to the upper surface of the 2nd claw crotch part 26 of the 2nd yoke part 23. FIG. The upper surface and the four side surfaces of the second permanent magnet 35 are completely covered with the crown portion 37. Further, in the assembled state as the rotor 13, the upper surface of the second permanent magnet 35 faces the inner peripheral surface of the front end side of the first claw-shaped magnetic pole part 20 with a predetermined gap through the crown part 37. ing.

Here, in order to obtain a sufficient magnetic saturation relaxation effect with a small-capacity magnet, an anisotropic sintered rare earth magnet having an energy product BHmax of 30 MGOe or more should be used for the first and second permanent magnets 30 and 35. Is preferred.
Further, in the first and second permanent magnets 30 and 35, the magnetization direction 27 is opposite to the direction of the magnetic field 28 generated 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 28 is generated in the direction of the arrow, the first and second permanent magnets 30 and 35 are magnetized in the opposite direction to the magnetic field 28. Is done. Here, the magnetization direction 27 of the first and second permanent magnets 30, 35 coincides with the radial direction, and the first and second claw-shaped magnetic pole parts 20, which are opposed to the extension lines of the magnetization direction 27, 24 toward the inner peripheral surface on the tip side. In the case of a design in which the direction of the magnetic field 28 generated by the field current flowing through the field coil 14 is reversed, the first and second permanent magnets 30 and 35 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 effect of mounting the first and second permanent magnets 30 and 35 will be described.
First, the magnetic flux generated by energizing the field coil 14 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 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 to the second claw. The magnetic pole portion 24 enters. Next, the magnetic flux 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 the first claw-shaped magnetic pole portion 20. To. 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.

  On the other hand, in order for the magnetic flux generated from the first and second permanent magnets 30 and 35 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 30 and 35 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 are within 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 generated from the first and second permanent magnets 30 and 35 forms a magnetic circuit closed inside the rotor 13 without detouring to the stator core 11.

  Here, the first and second permanent magnets 30 and 35 are magnetized and oriented so as to be opposite to the direction of the magnetic field 28 generated by the field coil 14. Therefore, the magnetic flux generated by the first and second permanent magnets 30 and 35 is in the opposite direction to the magnetic flux generated by the field coil 14, and the magnetic flux density of the magnetic body constituting the first and second pole core bodies 17 and 21 is set. It can be greatly reduced and magnetic saturation can be eliminated. Thereby, the amount of magnetic flux linked to the stator 10 can be increased, and a large amount of power generation can be obtained. In particular, the amount of power generation in the low-speed idling region where magnetic saturation is remarkable can be greatly increased.

  According to the first embodiment, the first and second magnet protective covers 31 and 36 cover the first and second permanent magnets 30 and 35 with the first and second permanent magnets 30 and 35 from the first and second permanent magnets 30 and 35. The extending attachment arms 33 and 38 are attached by welding to both end surfaces in the axial direction of the yoke portions 19 and 23. Therefore, the displacement of the first and second claw-shaped magnetic pole portions 20 and 24 due to the centrifugal force does not act on the first and second magnet protective covers 31 and 36 and the first and second permanent magnets 30 and 35. Further, the mounting strength of the first and second magnet protective covers 31 and 36 is increased. Therefore, the first and second permanent magnets 30 and 35 can be stably held for a long time with a simple magnet holding structure. Furthermore, it is not necessary to excessively increase the processing accuracy of the first and second permanent magnets 30 and 35 and the magnet holding portions of the first and second yoke portions 19 and 23, and the manufacturing cost can be reduced.

In addition, since the first and second magnet protective covers 31 and 36 are made of a magnetic material, the first and second permanent magnets 30 and 35 are magnetically attracted to the crown portions 32 and 37, and handling becomes easy. .
Further, the upper surfaces and all side surfaces of the first and second permanent magnets 30 and 35 are completely covered with the crown portions 32 and 37 of the first and second magnet protective covers 31 and 36. Therefore, the foreign matter does not fly and directly hit the first and second permanent magnets 30 and 35, and the occurrence of damage to the permanent magnet due to the foreign matter flying is suppressed. Moreover, even if the first and second permanent magnets 30 and 35 are damaged, scattering of the magnet pieces caused by the damage is prevented.

  Further, the mounting arms 33 and 38 extending from the crown portions 32 and 37 of the first and second magnet protective covers 31 and 36 are welded to both end surfaces of the first and second yoke portions 19 and 23 in the axial direction. ing. Therefore, the welding positions of the mounting arms 33, 38 and the first and second yoke portions 19, 23 can be separated from the first and second permanent magnets 30, 35, and the first and second permanent magnets 30 by welding are separated. , 35 can be suppressed. Moreover, it is suppressed that centrifugal force concentrates on the welding part of the attachment arms 33 and 38 and the 1st and 2nd yoke parts 19 and 23, and damages the 1st and 2nd yoke parts 19 and 23. The first and second permanent magnets 30 and 35 can be stably held for a long time.

Embodiment 2. FIG.
FIG. 5 is an end view showing a pole core body of a rotor applied to an automotive alternator according to Embodiment 2 of the present invention.

In FIG. 5, in the first pole core body 17 </ b> A, the fitting groove 40 is recessed on the inner diameter side of the first claw crotch portion 25 on both axial end surfaces of the first yoke portion 19. The fitting groove 40 has an inner shape equivalent to the outer shape of the mounting arm of the first magnet protective cover, and is formed to have a groove depth equivalent to the thickness of the mounting arm. In the second pole core body 21 </ b> A, the fitting groove 41 is recessed on the inner diameter side of the second claw crotch portion 26 on both axial end surfaces of the second yoke portion 23. The fitting groove 41 has an inner shape equivalent to the outer shape of the mounting arm of the second magnet protective cover, and has a groove depth equivalent to the thickness of the mounting arm.
Other configurations of the second embodiment are configured in the same manner as in the first embodiment.

  In the second embodiment, the top surfaces of the first and second claw crotch portions 25 and 26 of the first and second yoke portions 19 and 23 are covered with the first and second permanent magnets from above. Fitting grooves 40, which are mounted on the inner diameter side of the first and second claw crotch portions 25, 26 on both axial end surfaces of the first and second yoke portions 19, 23, respectively. 41 are respectively fitted. Then, the first and second permanent magnets are welded to the both axial end surfaces of the first and second yoke portions 19 and 23 while pressing the first and second magnet protective covers toward the inner diameter side. Are attached to the first and second yoke portions 19, 23.

Therefore, the second embodiment also has the same effect as the first embodiment.
Further, according to the second embodiment, the mounting arms are fitted into the fitting grooves 40 and 41 that are recessed in the axial end surfaces of the first and second yoke portions 19 and 23. And positioning of the 2nd magnet protection cover and the 1st and 2nd permanent magnet becomes simple.
Further, since the fitting grooves 40 and 41 are formed to have a groove depth equivalent to the thickness of the mounting arm, the first and second yoke portions 19 of the mounting arm fitted in the fitting grooves 40 and 41, Protrusion from both axial end faces of 23 is suppressed. Therefore, it becomes easy to attach the cooling fan and the field coil.

Embodiment 3 FIG.
6 is an end view showing a pole core body of a rotor applied to an automotive alternator according to Embodiment 3 of the present invention, and FIG. 7 is a magnet in the automotive alternator according to Embodiment 3 of the present invention. FIG. 8 is a perspective view for explaining a method of mounting the protective cover on the permanent magnet, and FIG. 8 is an end view showing a state where the permanent magnet is mounted on the pole core body in the automotive alternator according to Embodiment 3 of the present invention.

  6 and 7, the first magnet protective cover 31A is manufactured by deep drawing, for example, stainless steel having magnetism, and has an inner shape substantially equivalent to the outer shape of the first permanent magnet 30, and has one surface. A crowning part 32 made in a box shape as an opening and an attachment arm 33 </ b> A extending from two opposite sides of the crowning part 32 are provided. The second magnet protective cover 36A is manufactured by deep drawing, for example, stainless steel having magnetism, and has an inner shape that is substantially the same as the outer shape of the second permanent magnet 35, and is manufactured in a box shape with one side opened. And a mounting arm 38 </ b> A extending from two opposite sides of the crowning portion 37. These mounting arms 33A and 38A are formed in a so-called tab tail shape in which the arm width gradually increases toward the extending end.

In the first pole core body 17 </ b> B, the fitting groove 40 </ b> A is recessed on the inner diameter side of the first claw crotch portion 25 on both axial end surfaces of the first yoke portion 19. The fitting groove 40A has an inner shape equivalent to the outer shape of the mounting arm 33A of the first magnet protective cover 31A, and is formed with a groove depth equivalent to the thickness of the mounting arm 33A. In the second pole core body 21 </ b> B, the fitting groove 41 </ b> A is recessed on the inner diameter side of the second claw crotch portion 26 on both axial end surfaces of the second yoke portion 23. The fitting groove 41A has an inner shape equivalent to the outer shape of the mounting arm 38A of the second magnet protective cover 36A, and has a groove depth equivalent to the thickness of the mounting arm 38A.
In addition, the other structure of Embodiment 3 is comprised similarly to the said Embodiment 1. FIG.

  In the third embodiment, the first and second permanent magnets 30 and 35 are covered with the crown portions 32 and 37 from above, and the first and second claw crotch portions of the first and second yoke portions 19 and 23 are covered. The mounting arms 33A and 38A are respectively mounted on the upper surfaces of the first and second yoke portions 19 and 23 on the inner diameter side of the first and second claw crotch portions 25 and 26. They are fitted into the recessed fitting grooves 40A and 41A, respectively. Then, as shown in FIG. 8, the mounting arms 33A and 38A are welded to both axial end surfaces of the first and second yoke portions 19 and 23, respectively, so that the first and second permanent magnets 30 and 35 are the first ones. The first and second yoke portions 19 and 23 are attached.

Therefore, the third embodiment has the same effect as the first embodiment.
Further, according to the third embodiment, the mounting arms 33A, 38A are formed in a tab tail shape, and the fitting grooves 40A, 41A are formed in a shape suitable for the mounting arms 33A, 38A. The movement of the first and second yoke portions 19 and 23 along the axial end surfaces of the first and second yoke portions 19 and 23 is restricted, and 38A is fitted in the fitting grooves 40A and 41A. Therefore, the positioning of the first and second magnet protective covers 31A, 36A and the first and second permanent magnets 30, 35 is simplified, and the mounting arms 33A, 38A and the first and second yoke portions 19, 23 are arranged. It becomes easy to weld. Furthermore, since the attachment arms 33A and 38A are prevented from coming off from the fitting grooves 40A and 41A in the radial direction, the first and second permanent magnets 30 and 35 are more firmly held.

  In addition, since the fitting grooves 40A and 41A are formed to have a groove depth equivalent to the thickness of the mounting arms 33A and 38A, the first and first mounting arms 33A and 38A fitted in the fitting grooves 40A and 41A. Protrusion from the both end surfaces of the two yoke portions 19 and 23 in the axial direction is suppressed. Therefore, it becomes easy to attach the cooling fan and the field coil.

Embodiment 4 FIG.
9 is an end view showing a pole core body of a rotor applied to an automotive alternator according to Embodiment 4 of the present invention, and FIG. 10 shows a magnet in the automotive alternator according to Embodiment 4 of the present invention. FIG. 11 is an end view showing a state in which a permanent magnet is mounted on a pole core body in an automotive alternator according to Embodiment 4 of the present invention.

  9 and 10, the first magnet protective cover 31B is manufactured by deep drawing, for example, stainless steel having magnetism, and has an inner shape substantially equivalent to the outer shape of the first permanent magnet 30, and has one surface. A crowning part 32 made in a box shape as an opening and a mounting arm 33B extending from two opposite sides of the crowning part 32 are provided. The second magnet protective cover 36B is manufactured by deep drawing, for example, stainless steel having magnetism, and has an inner shape substantially the same as the outer shape of the second permanent magnet 35, and is manufactured in a box shape with one side opened. And a mounting arm 38 </ b> B extending from two opposite sides of the crowning portion 37. These mounting arms 33B and 38B are formed to have an arm width equivalent to the side width of the crowned portions 32 and 37, base portions 33a and 38a constituting the base portions of the mounting arms 33B and 38B, and formed into a circular flat plate shape. The arm portions 33B and 38B are formed to have arm widths narrower than the diameters of the engaging portions 33b and 38b as the wide portions and the engaging portions 33b and 38b constituting the tip portions of the mounting arms 33B and 38B, and the base portions 33a and 38a and the engaging portions 33b and 38b. And connecting portions 33c and 38c as narrow portions that connect the two.

In the first pole core body 17 </ b> C, the fitting groove 40 </ b> B is recessed on the inner diameter side of the first claw crotch portion 25 on both axial end surfaces of the first yoke portion 19. The fitting groove 40B has an inner shape equivalent to the outer shape of the mounting arm 33B of the first magnet protective cover 31B, and has a groove depth equivalent to the thickness of the mounting arm 33B. In the second pole core body 21 </ b> C, the fitting groove 41 </ b> B is recessed on the inner diameter side of the second claw crotch portion 26 on both axial end surfaces of the second yoke portion 23. The fitting groove 41B has an inner shape equivalent to the outer shape of the mounting arm 38B of the second magnet protective cover 36B, and is formed with a groove depth equivalent to the thickness of the mounting arm 38B.
The other configuration of the fourth embodiment is the same as that of the first embodiment.

  In the fourth embodiment, the first and second permanent magnets 30 and 35 are covered with the crown portions 32 and 37 from above, and the first and second claw crotches of the first and second yoke portions 19 and 23 are applied. The mounting arms 33B and 38B are respectively mounted on the upper surfaces of the first and second claw crotch portions 25 and 26 on both axial ends of the first and second yoke portions 19 and 23. The fitting grooves 40B and 41B are respectively fitted into the recessed fitting grooves 40B and 41B. Then, as shown in FIG. 11, the attachment arms 33B and 38B are welded to the axial end surfaces of the first and second yoke portions 19 and 23, respectively, so that the first and second permanent magnets 30 and 35 The first and second yoke portions 19 and 23 are attached.

Therefore, the fourth embodiment also has the same effect as the first embodiment.
Further, according to the fourth embodiment, the mounting arms 33B and 38B are connected to the connecting portions 33c and 38c having a narrow arm width, and the engaging portions 33b and 38b having a circular plate shape having a diameter wider than that of the connecting portions 33c and 38c. Since the fitting grooves 40B and 41B are formed in a shape that fits to the mounting arms 33B and 38B, the mounting arms 33B and 38B have both ends in the axial direction of the first and second yoke portions 19 and 23. The movement along the surface is restricted and the fitting grooves 40B and 41B are fitted. Therefore, the positioning of the first and second magnet protective covers 31B, 36B and the first and second permanent magnets 30, 35 is simplified, and the mounting arms 33B, 38B and the first and second yoke portions 19, 23 are arranged. It becomes easy to weld. Furthermore, since the mounting arms 33B and 38B are prevented from coming off in the radial direction from the fitting grooves 40B and 41B, the first and second permanent magnets 30 and 35 are more firmly held.

  In addition, since the fitting grooves 40B and 41B are formed to have a groove depth equivalent to the thickness of the mounting arms 33B and 38B, the first and first mounting arms 33B and 38B fitted in the fitting grooves 40B and 41B. Protrusion from the both end surfaces of the two yoke portions 19 and 23 in the axial direction is suppressed. Therefore, it becomes easy to attach the cooling fan and the field coil.

  In the fourth embodiment, the engaging portion is formed in a circular flat plate shape. However, the shape of the engaging portion is not limited to a circular shape and is wider than the arm width of the connecting portion. For example, a rectangular flat plate shape may be used.

Embodiment 5 FIG.
12 is a perspective view showing a pole core body of a rotor applied to an automotive alternator according to Embodiment 5 of the present invention, and FIG. 13 is a permanent view in the automotive alternator according to Embodiment 5 of the present invention. FIG. 14 is a perspective view for explaining a method of mounting a magnet on a magnet pedestal member, and FIG. 14 shows a state in which a permanent magnet mounted with a magnet protective cover is mounted on a magnet pedestal member in an automotive alternator according to Embodiment 5 of the present invention. FIG. 15 is an end view showing a state where a permanent magnet is mounted on a pole core body in an automotive alternator according to Embodiment 5 of the present invention.

  In FIG. 12, the first pole core body 17 </ b> D has a first trough portion 45 recessed in a first U-shape projecting toward the inner diameter side at the first claw crotch portion of the first yoke portion 19, and holding the first pedestal. A groove 46 is recessed in each of the opposing portions of the inner wall surface of the first valley 45 with the groove direction as the axial direction so as to penetrate from one end to the other end in the axial direction with the groove direction as the axial direction. In the second pole core body 21D, the second trough portion 47 is recessed in the second claw crotch portion of the second yoke portion 23 in a convex U shape toward the inner diameter side, and the second pedestal holding groove 48 is a groove. Recesses are formed so as to penetrate from one end to the other end in the axial direction with the groove direction as the axial direction in each of the opposing portions of the inner wall surface of the second valley portion 47 with the direction as the axial direction.

  In FIG. 13, the first magnet base member 50 is manufactured by a cold forging method using, for example, low carbon steel such as S10C, and is formed integrally with the first magnet holding part 51 and the lower part of the first magnet holding part 51. First bridging portion 52. A first magnet holding groove 53 for holding the first permanent magnet 30 is recessed on the upper surface of the first magnet holding portion 51 so as to penetrate in the thickness direction. Further, both side portions of the first bridging portion 52 are formed in an outer shape that matches the groove shape of the first pedestal holding groove 46.

  The first permanent magnet 30 is placed in the first magnet holding groove 53 by covering the crown portion 32 of the first magnet protective cover 31 from above. Further, the attachment arm 33 extending from the crown portion 32 is welded to both end surfaces in the thickness direction of the first magnet base member 50 while pressing the first magnet protection cover 31 against the first magnet base member 50. Thereby, as shown in FIG. 14, the first permanent magnet 30 is attached to the first magnet base member 50 in a fixed state with the lower surface in close contact with the bottom surface of the first magnet holding groove 53. The upper surface and four side surfaces of the first permanent magnet 30 are completely covered with the crown portion 32. As shown in FIG. 15, the first magnet pedestal member 50 to which the first permanent magnet 30 is attached has the thickness direction as the axial direction, and both side portions of the first bridging portion 52 from the axial direction to the first pedestal holding groove 46. And is fixed to the first valley 45 by being attached with an adhesive as necessary.

  The second magnet pedestal member 55 is manufactured by a cold forging method using, for example, low carbon steel such as S10C, and is formed integrally with the second magnet holding part 56 and the lower part of the second magnet holding part 56. And a bridging portion 57. A second magnet holding groove 58 for holding the second permanent magnet 35 is recessed on the upper surface of the second magnet holding portion 56 so as to penetrate in the thickness direction. Further, both side portions of the second bridging portion 57 are formed in an outer shape that matches the groove shape of the second pedestal holding groove 48.

  Then, the second permanent magnet 35 is placed in the second magnet holding groove 58 by covering the crown portion 37 of the second magnet protective cover 36 from above. Further, the attachment arm 38 extending from the crown portion 37 is welded to both end surfaces in the thickness direction of the second magnet base member 55 while pressing the second magnet protection cover 36 against the second magnet base member 55. Thereby, as shown in FIG. 14, the second permanent magnet 35 is attached to the second magnet pedestal member 55 in a fixed state with the lower surface in close contact with the bottom surface of the second magnet holding groove 58. The upper surface and the four side surfaces of the second permanent magnet 35 are completely covered with the crown portion 37. As shown in FIG. 15, the second magnet pedestal member 55 to which the second permanent magnet 35 is attached has the thickness direction as the axial direction, and both side portions of the second bridging portion 57 from the axial direction to the second pedestal holding groove 48. And is fixed to the second trough 47 by being fixed with an adhesive if necessary.

In the state where the first and second pole core bodies 17D and 21D are assembled as a rotor, the upper surface of the first permanent magnet 30 is the inner circumference on the front end side of the second claw-shaped magnetic pole portion 24 via the crown portion 32. It faces the surface with a predetermined gap. Similarly, the upper surface of the second permanent magnet 35 is opposed to the inner peripheral surface of the front end side of the first claw-shaped magnetic pole part 20 with a predetermined interval through the crown part 37.
The other configuration of the fifth embodiment is the same as that of the first embodiment.

Therefore, the fifth embodiment also has the same effect as the first embodiment.
Further, according to the fifth embodiment, the first and second pedestal holding grooves 46 and 48 are formed in the first and second valley portions 45 and 47 with the groove direction as the axial direction. The two magnet pedestal members 50 and 55 can be held by the first and second pole core bodies 17D and 21D simply by inserting them into the first and second pedestal holding grooves 46 and 48 from the axial direction. Thereby, the assembly property of a rotor is improved.

  Moreover, since the 1st and 2nd permanent magnets 30 and 35 are hold | maintained at the 1st and 2nd magnet base members 50 and 55 currently constructed by the upper part of the 1st and 2nd trough parts 45 and 47, they are 1st. And the 2nd permanent magnets 30 and 35 can be made into a required minimum magnitude | size. Therefore, the centrifugal force acting on the first and second magnet pedestal members 50 and 55 and the first and second permanent magnets 30 and 35 is reduced during high-speed rotation. Accordingly, the first and second permanent magnets 30 and 35 can be stably held on the first and second pole cores 17D and 21D with a simple holding structure.

Embodiment 6 FIG.
FIG. 16 is a perspective view showing a pole core body of a rotor applied to an automotive alternator according to Embodiment 6 of the present invention.
In FIG. 16, the first and second pedestal holding grooves 46A and 48A are axially inward of the first and second valley portions 45 and 47 of the first and second pole core bodies 17E and 21E, with the groove direction being the axial direction. It is recessed so as to open only at the top.
The other configuration of the sixth embodiment is the same as that of the fifth embodiment.

  According to the sixth embodiment, since the axially outer sides of the first and second pedestal holding grooves 46A and 48A are closed, the first and second magnet pedestal members 50 and 55 are moved from the axially inner side. When the first and second pedestal holding grooves 46 and 48 are inserted into the first and second pedestal holding grooves 46 and 48, the axially outer wall surfaces of the first and second pedestal holding grooves 46 and 48 serve as stoppers. Function. Therefore, the first and second magnet pedestal members 50 and 55 can be easily positioned in the axial direction, and the first and second magnet pedestal members 50 and 55 are connected to the first and second magnet pedestal members 50 and 55. The second pole cores 17E and 21E can be stably held.

Embodiment 7 FIG.
FIG. 17 is a perspective view for explaining a method of mounting a permanent magnet on a magnet base member in an automotive alternator according to Embodiment 7 of the present invention, and FIG. 18 is an automotive alternator according to Embodiment 7 of the present invention. It is a perspective view which shows the state which mounted the permanent magnet with which the magnet protection cover in a machine was mounted on the magnet base member.

In FIG. 17, the fitting grooves 60 are recessed below the first magnet holding grooves 53 on both end surfaces in the thickness direction of the first magnet base member 50A. The fitting groove 60 has an inner shape equivalent to the outer shape of the mounting arm 33A of the first magnet protective cover 31A, and has a groove depth equivalent to the thickness of the mounting arm 33A. The fitting groove 61 is recessed below the second magnet holding groove 58 on both end faces in the thickness direction of the second magnet base member 55A. The fitting groove 61 has an inner shape equivalent to the outer shape of the mounting arm 38A of the second magnet protective cover 36A and a groove depth equivalent to the thickness of the mounting arm 38A.
The other configuration of the seventh embodiment is the same as that of the fifth embodiment.

  In the seventh embodiment, the first and second permanent magnets 30 and 35 are covered with the crown portions 32 and 37 of the first and second magnet protective covers 31A and 36A from above, respectively. It is stored in the two magnet holding grooves 53 and 58. Further, the first and second magnet protective covers 31A and 36A are pressed against the first and second magnet pedestal members 50A and 55A, and the attachment arms 33A and 38A extending from the crown portions 32 and 37 are first and second. The magnet pedestal members 50A and 55A are fitted into fitting grooves 60 and 61 that are recessed in both end faces in the thickness direction. Thereby, as shown in FIG. 18, the first and second permanent magnets 30 and 35 are fixed in a fixed state with their lower surfaces in close contact with the bottom surfaces of the first and second magnet holding grooves 53 and 58, respectively. Two magnet base members 50A and 55A are attached.

Therefore, the seventh embodiment has the same effect as the fifth embodiment.
Further, according to the seventh embodiment, the mounting arms 33A, 38A are formed in a tab tail shape, and the fitting grooves 60, 61 are formed in a shape suitable for the mounting arms 33A, 38A. The movement of the first and second magnet base members 50A and 55A along the thickness direction end faces is restricted, and 38A is fitted in the fitting grooves 60 and 61. Therefore, positioning of the first and second magnet protective covers 31A, 36A and the first and second permanent magnets 30, 35 is simplified, and the mounting arms 33A, 38A and the first and second magnet base members 50, 55 are arranged. It becomes easy to weld. Further, since the mounting arms 33A and 38A are prevented from coming off upward from the fitting grooves 60 and 61, the first and second permanent magnets 30 and 35 are more firmly held.

Embodiment 8 FIG.
FIG. 19 is a perspective view for explaining a method of mounting a permanent magnet on a magnet base member in an automotive alternator according to Embodiment 8 of the present invention, and FIG. 20 is an automotive alternator according to Embodiment 8 of the present invention. It is a perspective view which shows the state which mounted the permanent magnet with which the magnet protection cover in a machine was mounted on the magnet base member.

  In FIG. 19, the first and second magnet protective covers 31 </ b> C and 36 </ b> C are respectively produced by deep drawing, for example, stainless steel having magnetism, and are substantially equivalent to the outer shapes of the first and second permanent magnets 30 and 35. Crowned portions 32, 37 that have an inner shape and are formed in a box shape with one side open, and mounting arms 33C, 38C that extend from two opposite sides of the crowned portions 32, 37; It has. These mounting arms 33C, 38C are formed in a circular flat plate shape, and are formed to have an arm width narrower than the diameter of the engaging portions 33b, 38b and the engaging portions 33b, 38b constituting the distal ends of the mounting arms 33C, 38C. The connecting portions 33c and 38c for connecting the crown portions 32 and 37 and the engaging portions 33b and 38b are provided.

Further, the fitting groove 60A is recessed below the first magnet holding grooves 53 on both end surfaces in the thickness direction of the first magnet base member 50B. The fitting groove 60A has an inner shape equivalent to the outer shape of the mounting arm 33C of the first magnet protective cover 31C and a groove depth equivalent to the thickness of the mounting arm 33C. The fitting groove 61A is recessed below the second magnet holding groove 58 on both end faces in the thickness direction of the second magnet base member 55B. The fitting groove 61A has an inner shape equivalent to the outer shape of the mounting arm 38C of the second magnet protective cover 36C and a groove depth equivalent to the thickness of the mounting arm 38C.
The other configuration of the eighth embodiment is the same as that of the fifth embodiment.

  In the eighth embodiment, the first and second permanent magnets 30 and 35 are covered with the crown portions 32 and 37 of the first and second magnet protective covers 31C and 36C from above, respectively. It is stored in the two magnet holding grooves 53 and 58. Furthermore, while pressing the first and second magnet protective covers 31C, 36C against the first and second magnet pedestal members 50B, 55B, the mounting arms 33C, 38C extending from the crown portions 32, 37 are first and second. The magnet base members 50B and 55B are fitted into fitting grooves 60A and 61A that are recessed in both end faces in the thickness direction. Thereby, as shown in FIG. 20, the first and second permanent magnets 30 and 35 are fixed in a fixed state with their lower surfaces in close contact with the bottom surfaces of the first and second magnet holding grooves 53 and 58. Two magnet base members 50B and 55B are attached.

Therefore, the eighth embodiment has the same effect as the fifth embodiment.
Further, according to the eighth embodiment, the mounting arms 33C, 38C are connected to the connecting portions 33c, 38c having a narrow arm width. The engaging portions 33b, 38b having a circular plate shape having a diameter wider than that of the connecting portions 33c, 38c. Since the fitting grooves 60A and 61A are formed in a shape that fits the mounting arms 33C and 38C, the mounting arms 33C and 38C have both axial ends of the first and second magnet base members 50B and 55B. The movement along the surface is restricted and the fitting grooves 60A and 61A are fitted. Therefore, the positioning of the first and second magnet protective covers 31C, 36C and the first and second permanent magnets 30, 35 is simplified, and the mounting arms 33C, 38C and the first and second magnet base members 50B, 55B It becomes easy to weld. Further, since the mounting arms 33C and 38C are prevented from coming off upward from the fitting grooves 60A and 61A, the holding of the first and second permanent magnets 30 and 35 becomes stronger.

In the fifth to eighth embodiments, the first and second magnet pedestal members are manufactured by cold forging using low carbon steel, but the first and second magnet pedestal members are made of a low material. The material is not limited to carbon steel, and any magnetic material may be used. Further, the manufacturing method of the first and second magnet base members is not limited to the cold forging method, and may be machining such as cutting.
In the fifth to eighth embodiments, the first and second magnet pedestal members are slidably fitted into the first and second pedestal holding grooves of the first and second troughs. The second magnet base member may be fixed to the inner wall surfaces of the first and second troughs by welding or the like.

In the fifth to eighth embodiments, the first and second permanent magnets are fitted in the first and second magnet holding grooves and are held by the first and second magnet base members. The first and second magnet holding grooves may be omitted, and the first and second permanent magnets may be held directly on the upper surfaces of the first and second magnet base members.
In the fifth to eighth embodiments, the first and second magnet pedestal members holding the first and second permanent magnets are constructed on the first and second troughs. The first and second magnet base members holding the two permanent magnets may be fitted to the claw crotch portions of the first and second pole core bodies according to the first embodiment or fixed by welding or the like.

In each of the above embodiments, the first and second magnet protective covers are made of a magnetic material. However, the first and second magnet protective covers may be made of a nonmagnetic material. In this case, the leakage magnetic flux through the first and second magnet protective covers is eliminated, and the magnetic fluxes of the first and second permanent magnets can be effectively utilized.
In each of the above embodiments, the first and second permanent magnets are completely covered by the crown portions of the first and second magnet protective covers. However, the first and second permanent magnets are not necessarily provided. It is not necessary to be completely covered by the crowning portion, and it is sufficient that at least the upper surface side of the upper surfaces and all the side surfaces of the first and second permanent magnets are covered by the crowning portion.

In each of the above embodiments, the first and second permanent magnets are formed in a rectangular parallelepiped, but the shapes of the first and second permanent magnets are not limited to a rectangular parallelepiped.
Further, in each of the above embodiments, the permanent magnets are disposed on all the claw crotch portions of the yoke portion. However, the permanent magnets are not necessarily disposed on all the claw crotch portions. May be arranged in every other claw crotch part in the circumferential direction.
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.

  10 Stator, 13 Rotor, 14 Field coil, 15 Pole core, 16 Shaft, 17, 17A, 17B, 17C, 17D, 17E First pole core body, 18 First boss portion, 19 First yoke portion, 20 First 1 claw-shaped magnetic pole part, 21, 21A, 21B, 21C, 21D, 21E second pole core body, 22 second boss part, 23 second yoke part, 24 second claw-shaped magnetic pole part, 25 first claw crotch part, 26 2nd claw crotch part, 29 Air gap, 30 1st permanent magnet, 31, 31A, 31B, 31C 1st magnet protective cover, 32 Crowning part, 33, 33A, 33B, 33C Mounting arm, 33b Engaging part ( Wide part), 33c Connection part (narrow part), 35 Second permanent magnet, 36, 36A, 36B, 36C Second magnet protective cover, 37 Crowned part, 38, 38A, 38B, 38C Mounting arm, 38b Joint part (wide part), 38c connecting part (narrow part), 40, 40A, 40B fitting groove, 41, 41A, 41B fitting groove, 45 first valley part (claw crotch part), 46 pedestal holding groove, 47 Second trough (claw crotch), 48 Pedestal holding groove, 50, 50A, 50B First magnet pedestal member, 53 First magnet holding groove, 55, 55A, 55B Second magnet pedestal member, 58 Second magnet holding Groove, 60, 60A fitting groove, 61, 61A fitting groove.

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 fixed to a shaft having a plurality of claw-shaped magnetic pole portions arranged in a direction and inserted through an axial center position 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;
At least one of the claw claw portions of the yoke portion facing the inner circumferential surface of the tip of the claw-shaped magnetic pole portion is opposed to the inner circumferential surface of the tip of the claw-shaped magnetic pole portion, and the lower surface is claw crotch of the yoke portion. A permanent magnet disposed in close contact with the part;
A box-shaped crown portion covering the permanent magnet so as to cover at least the upper surface side of the upper surface and all side surfaces of the permanent magnet, and the yoke portion extending downward from both axial sides of the crown portion Bei example and a magnet protection cover of metallic having a mounting arm which is welded to both end surfaces in the axial direction of,
A fitting groove is recessed in the axial shape of the yoke portion in an inner shape that matches the outer shape of the mounting arm, and the yoke is fitted in the fitting groove. A rotating electrical machine wherein the permanent magnet is positioned with respect to the claw crotch portion of the yoke portion . The rotating electrical machine according to claim 1, wherein the mounting arm is formed in a tab tail shape. The mounting arm, the rotary electric machine according to claim 1, wherein a width wide portion is formed to continuously provided by the end shape through a narrow portion. 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 fixed to a shaft having a plurality of claw-shaped magnetic pole portions arranged in a direction and inserted through an axial center position 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 magnet base member made of a magnetic material disposed on at least one of the claw crotch portions of the yoke portion opposed to the inner peripheral surface of the tip of the claw-shaped magnetic pole portion;
A permanent magnet disposed on the magnet pedestal member relative to the inner peripheral surface of the tip of the claw-shaped magnetic pole part and having a lower surface in close contact with the magnet pedestal member;
A box-shaped crown portion covering the permanent magnet so as to cover at least the upper surface side of the upper surface and all side surfaces of the permanent magnet, and the magnet base member extending downward from both axial sides of the crown portion Bei example and a magnet protection cover of metallic having a mounting arm which is welded to both end surfaces in the axial direction of,
The magnet pedestal with the fitting groove recessed in the inner shape conforming to the outer shape of the mounting arm on both axial end surfaces of the magnet pedestal member, and the mounting arm being fitted into the fitting groove. A rotating electrical machine, wherein the rotating magnet is welded to a member and the permanent magnet is positioned with respect to the magnet base member . 5. The rotating electrical machine according to claim 4, wherein the magnet base member to which the permanent magnet and the magnet protective cover are attached is slidably disposed on the claw crotch portion of the yoke portion. Claw crotch portion of the yoke portion is recessed in a convex shape toward the inner diameter side, it spanned claw crotch portion of the magnet base member the yoke portions, characterized in that it is held claim 4 or The rotating electrical machine according to claim 5 .   A pedestal holding groove is recessed in each of the opposing portions of the inner wall surface of the claw crotch portion of the yoke portion so as to open at least one side in the groove direction with the groove direction as an axial direction. The rotating electric machine according to claim 6, wherein both side portions in the circumferential direction are fitted into the pedestal holding grooves and are held by the claw crotch portions of the yoke portion. A magnet holding groove is recessed on the upper surface of the magnet pedestal member with the groove direction as an axial direction, the permanent magnet is fitted into the magnet holding groove, and the lower surface is brought into close contact with the bottom surface of the magnet holding groove. The rotating electrical machine according to claim 4 , wherein the rotating electrical machine is held by the rotating electrical machine. The rotating electrical machine according to claim 4, wherein the mounting arm is formed in a tab tail shape. The mounting arm, the rotary electric machine according to claim 4, wherein a width wide portion is formed to continuously provided by the end shape through a narrow portion.

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