JP2010110169A - Rotor for electric rotary machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotor for an electric rotary machine, which prevent damage to permanent magnets 7 in a low cost constitution without an excess force applied thereto when the permanent magnet 7 is assembled or in use or the like. <P>SOLUTION: The permanent magnets 7 are not fixed to the magnetic supporting segment 8a of a magnet support ring in advance and each permanent magnet is assembled separately of the magnet support ring. Prior to assembling the permanent magnets 7, the magnet support ring is preliminarily located on inner peripheral sides of a claw-shaped magnetic pole 3c while being combined with a pair of field iron cores 3A, 3B, and then the permanent magnets 7 are inserted into magnet insertion spaces in longitudinal directions. This method allows the individual magnets 7 to be easily inserted into magnet insertion spaces for assembly in spite of the variation in working accuracy and assembling accuracy of the claw-shaped magnetic pole 3c, so that an excess force is not applied to the magnets 7 during assembling, thereby preventing the magnets 7 from being damaged. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rotor of a rotating electrical machine in which a permanent magnet is disposed between claw-shaped magnetic poles provided on a pair of field iron cores.

Conventionally, for example, a technique disclosed in Patent Document 1 is known as an AC generator for automobiles or the like. In Patent Document 1, permanent magnets are inserted between the claw-shaped magnetic poles provided in the pair of Landel-type pole cores, and the effective magnetic flux contributing to power generation is reduced by reducing the leakage magnetic flux between the claw-shaped magnetic poles adjacent in the circumferential direction. A technique for improving the output by increasing the amount has been proposed.
Further, in the above-described conventional technology, a locking portion that protrudes in a circumferential manner from the outer peripheral portion of the side surface of the claw-shaped magnetic pole is provided, and the outer peripheral surface shoulder of the permanent magnet abuts on the inner periphery of the locking portion. This restricts the permanent magnet from jumping out in the centrifugal direction (radially outward) when the rotor rotates.
Further, the plurality of permanent magnets are each fixed to the outer peripheral surface of the support ring made of a non-magnetic material with an adhesive or the like to constitute a magnet assembly, and this magnet assembly is assembled to the pole core.
JP-A-8-223882

However, in the prior art disclosed in Patent Document 1, since a plurality of permanent magnets are fixed to the outer peripheral surface of the support ring with an adhesive or the like, extremely high component accuracy and assembly accuracy are required. That is, in the state of the magnet assembly, the positions of the plurality of permanent magnets are fixed in advance with respect to the support ring. When the permanent magnet is inserted or during use, excessive stress is applied to the permanent magnet, causing the permanent magnet to break.
Even if the accuracy of the magnet assembly (positional accuracy of the permanent magnet with respect to the support ring) is good, if there are variations in the processing accuracy of the claw-shaped magnetic poles, the claw-shaped magnetic poles adjacent in the circumferential direction with a pair of pole cores combined Even if a space enough to insert a permanent magnet between them (called a magnet insertion space) can be secured, the magnet insertion space and the permanent magnet fixed to the support ring are misaligned. There is also a risk that permanent magnets cannot be inserted into the space.

As described above, in the invention according to Patent Document 1, in order to easily insert a plurality of permanent magnets fixed to a support ring into a plurality of magnet insertion spaces, the component accuracy on the pole core side (especially a claw-like shape) The accuracy of the magnet assembly is required in addition to the magnetic pole machining accuracy) and the assembly accuracy, which is a cause of cost increase.
The present invention has been made based on the above circumstances, and its purpose is to prevent damage to the permanent magnet with a low-cost configuration without applying excessive force during assembly of the permanent magnet or during use. It is in providing the rotor of a rotary electric machine.

(Invention of Claim 1)
The present invention has a pair of field magnets that have a plurality of claw-shaped magnetic poles and are combined with each other so that the claw-shaped magnetic poles are alternately meshed with each other at a predetermined interval in the circumferential direction. It is disposed between the side surfaces of the iron core, the field winding wound around the pair of field iron cores, and the claw-shaped magnetic poles adjacent in the circumferential direction, and reduces the leakage magnetic flux between the adjacent claw-shaped magnetic poles. A plurality of permanent magnets magnetized in the direction and a non-magnetic support ring disposed on the inner peripheral side of the plurality of permanent magnets. A rotor of a rotating electrical machine provided with a locking portion protruding like a hook, with a support ring arranged in advance on the inner peripheral side of each claw-shaped magnetic pole provided in a pair of field iron cores, A permanent magnet is disposed between the side surfaces of the claw-shaped magnetic poles adjacent in the circumferential direction, and the inner peripheral side of the permanent magnet is supported. It is supported by the ring, and characterized in that the radially outward movement of the permanent magnet is restricted by the locking portion provided in the claw-shaped magnetic poles.

  According to said structure, a some permanent magnet is not necessarily fixed to the support ring, respectively, but a some permanent magnet and a support ring can be separately assembled | attached with respect to a pair of field iron core. That is, a support ring is arranged in advance on the inner peripheral side of each claw-shaped magnetic pole provided in the pair of field iron cores, and then a permanent magnet is inserted and assembled between the side surfaces of the claw-shaped magnetic poles adjacent in the circumferential direction. be able to. Thereby, even if there are variations in the processing accuracy and assembly accuracy of the claw-shaped magnetic poles, an excessive force is not applied to the permanent magnet, and the magnet can be prevented from being damaged during assembly or during use. As a result, when compared with the prior art (Patent Document 1) in which a plurality of permanent magnets are fixed to a support ring in advance, according to the present invention, it is not necessary to form a magnet assembly. Since it is not necessary to position the positional relationship with the support ring with high accuracy and there is no need to increase the component accuracy and assembly accuracy on the field iron core side, the cost can be reduced accordingly.

(Invention of Claim 2)
It is a rotor of the rotary electric machine according to claim 1, Comprising: Between the size of a diameter direction between a locking part provided in a claw-like magnetic pole, and a support ring, and the side of claw-like magnetic poles adjacent in the peripheral direction The magnet insertion space is defined by the circumferential dimension, and after placing the support ring on the inner peripheral side of each claw-shaped magnetic pole provided in the pair of field iron cores, the permanent magnet is inserted into the magnet insertion space from its longitudinal direction And assembled.
According to the present invention, a magnet insertion space is formed by disposing a support ring on the inner peripheral side of each claw-shaped magnetic pole provided in a pair of field iron cores, and a permanent magnet is inserted into the magnet insertion space alone. That is, it is not a state in which the permanent magnet is fixed to the support ring, but only the permanent magnet can be inserted into the magnet insertion space and assembled.

(Invention of Claim 3)
The present invention has a pair of field magnets that have a plurality of claw-shaped magnetic poles and are combined with each other so that the claw-shaped magnetic poles are alternately meshed with each other at a predetermined interval in the circumferential direction. It is disposed between the side surfaces of the iron core, the field winding wound around the pair of field iron cores, and the claw-shaped magnetic poles adjacent in the circumferential direction, and reduces the leakage magnetic flux between the adjacent claw-shaped magnetic poles. A plurality of permanent magnets magnetized in the direction and a non-magnetic support ring disposed on the inner peripheral side of the plurality of permanent magnets. A rotor of a rotating electrical machine provided with a locking portion protruding like a flange, and is previously supported on the inner peripheral side of a claw-shaped magnetic pole provided on one of the pair of field cores Specified by the radial dimension between the locking part provided on the claw-shaped magnetic pole and the support ring after the ring is placed The permanent magnet is inserted into the radial space to be supported, the inner peripheral side of the permanent magnet is supported by the support ring, and the movement of the permanent magnet to the radially outer side is maintained by the locking portion, and then The other field iron core is combined.

  According to said structure, a some permanent magnet is not necessarily fixed to a support ring, respectively, but a some permanent magnet and a support ring can be separately assembled | attached with respect to a field iron core. In other words, a support ring is arranged in advance on the inner peripheral side of the claw-shaped magnetic pole provided in one of the field cores, and then is defined by the radial dimension between the locking portion of the claw-shaped magnetic pole and the support ring. A permanent magnet can be inserted and assembled in the radial space. Thereby, even if there are variations in the processing accuracy and assembly accuracy of the claw-shaped magnetic poles, an excessive force is not applied to the permanent magnet, and the magnet can be prevented from being damaged during assembly or during use. As a result, when compared with the prior art (Patent Document 1) in which a plurality of permanent magnets are fixed to a support ring in advance, according to the present invention, it is not necessary to form a magnet assembly. Since it is not necessary to position the positional relationship with the support ring with high accuracy and there is no need to increase the component accuracy and assembly accuracy on the field iron core side, the cost can be reduced accordingly.

(Invention of Claim 4)
4. The rotor according to claim 1, wherein the support ring includes a plurality of magnet support portions that individually support the plurality of permanent magnets, and a connection that connects the plurality of magnet support portions in an annular shape. The magnet support part is characterized in that the length in the direction corresponding to the longitudinal direction of the permanent magnet is longer than the width of the connecting part.
In this case, by making the length of the magnet support portion longer than the width of the connecting portion, the permanent magnet can be stably pressed against the locking portion of the claw-shaped magnetic pole, and the reliability against centrifugal force stress is improved.

(Invention of Claim 5)
The rotor of the rotating electrical machine according to claim 4 is characterized in that the magnet support portion has a flat surface for supporting the permanent magnet.
For example, if the magnet support portion is formed in an arc shape having the same curvature as that of the connecting portion, the contact area with the permanent magnet is reduced because the permanent magnet cannot be contacted in a plane. On the other hand, in this invention, the contact area of a magnet support part and a permanent magnet can be taken large by making a magnet support part into a flat surface. As a result, the fixation of the permanent magnet is stabilized and the surface pressure of the contact surface between the permanent magnet and the magnet support portion is reduced, so that the reliability of the support ring and the permanent magnet is improved.

(Invention of Claim 6)
6. The rotor of the rotating electrical machine according to claim 4, wherein the magnet support portion has a shape and an area substantially equal to a shape and an area of an inner peripheral surface of the permanent magnet supported by the magnet support portion. It is characterized by.
In this case, since the permanent magnet can be more stably fixed without increasing the area of the magnet support portion more than necessary, the fixing reliability of the permanent magnet is further improved.

(Invention of Claim 7)
7. The rotor of any one of the rotating electric machines according to claim 4, wherein the magnet support portion is radially inward at at least one end portion of both ends in a direction corresponding to a longitudinal direction of the permanent magnet. A guide part that bends is provided.
By providing the guide portion at the end portion of the magnet support portion, the corner portion of the permanent magnet does not hit the end portion of the magnet support portion when the permanent magnet is assembled, and the assembly can be facilitated.
In addition, a guide part may be provided in the both ends of a magnet support part, and if the assembly direction of a permanent magnet is specified only to one direction, you may provide in only one end part of a magnet support part.

(Invention of Claim 8)
The rotor of any of the rotating electrical machines according to any one of claims 4 to 7, wherein the permanent magnet is supported by the inner peripheral surface being in contact with the magnet support portion, and both shoulder portions of the outer peripheral surface are claw-shaped magnetic poles. The movement toward the outside in the radial direction is restricted by abutting against the inner surface of the locking portion provided on the inner surface.
In this case, the permanent magnet is inserted with a slight allowance relative to the radial dimension between the locking portion of the claw-shaped magnetic pole and the magnet support portion of the support ring. That is, since the permanent magnet is in contact with both the locking portion of the claw-shaped magnetic pole and the magnet support portion of the support ring, the magnet is more reliably fixed against centrifugal force stress.

(Invention of Claim 9)
The rotor of the rotating electrical machine according to claim 8 is characterized in that an impregnation material is filled between a circumferential side surface of the permanent magnet and a side surface of the claw-shaped magnetic poles.
For example, by making the circumferential width dimension of the permanent magnet slightly smaller than the circumferential dimension between the side faces of the claw-shaped magnetic poles adjacent to each other in the circumferential direction, the permanent magnet is made permanent between the side faces of the claw-shaped magnetic poles adjacent in the circumferential direction. When the magnet is inserted, an excessive force is not applied to the permanent magnet, so that the permanent magnet can be prevented from being broken or damaged. However, in this case, since a gap is formed between the side surface of the permanent magnet and the side surface of the claw-shaped magnetic pole, the permanent magnet can be prevented from moving in the circumferential direction by filling the gap with an impregnating material (for example, epoxy resin). Since the permanent magnet can be held in a more stable state, the fixing reliability of the permanent magnet is improved.

(Invention of Claim 10)
The rotor of any one of the rotating electrical machines according to any one of claims 4 to 7, wherein an impregnation material is filled between the permanent magnet, the magnet support portion, and the claw-shaped magnetic pole.
In this case, since the permanent magnet can be held in a more stable state by the impregnating material (for example, epoxy resin), the fixing reliability of the permanent magnet is improved.

(Invention of Claim 11)
The rotor of any one of the rotating electrical machines according to any one of claims 1 to 10, wherein at least a radially outer peripheral surface of the permanent magnet is surrounded by a nonmagnetic member.
In this case, since the magnet strength against the centrifugal force stress is increased, the reliability is improved.

(Invention of Claim 12)
The rotor of the rotating electrical machine described in claim 11 is characterized in that the permanent magnet is housed in a holder formed in a box shape by a non-magnetic member.
In this case, since the entire surface of the permanent magnet can be surrounded by the holder, the permanent magnet does not directly hit the claw-shaped magnetic pole or the support ring when the permanent magnet is assembled, and the permanent magnet can be prevented from being damaged. In addition, the magnet strength against the centrifugal force stress is increased, and even if the permanent magnet is broken, it is possible to prevent the fragments of the permanent magnet from scattering.

  The best mode for carrying out the present invention will be described in detail with reference to Examples 1 to 3 below.

In Example 1, an example of the rotating electrical machine of the present invention will be described by applying it to a vehicle AC generator.
FIG. 1 is a cross-sectional view of a rotor 1 that functions as a field of a vehicle AC generator.
The rotor 1 includes a rotary shaft 2 that is rotatably supported by a housing (not shown) via a bearing (not shown), a pair of field iron cores 3 (3A, 3B) fixed to the rotary shaft 2, The field winding 4 wound around the pair of field cores 3, cooling fans 5 and 6 fixed to both end surfaces in the axial direction of the pair of field cores 3, and the pair of field cores 3. It is composed of a plurality (16 in this embodiment) of permanent magnets (hereinafter abbreviated as magnets 7), a support ring 8 that supports the magnets 7 from the radially inner peripheral side, and the like.

The rotary shaft 2 has a pulley (not shown) attached to one end (left side in the figure) in the axial direction, and rotates by receiving the rotational power of the engine by belt transmission.
The pair of field cores 3 is configured by combining one field core 3A having the same shape and the other field core 3B in the axial direction.
As shown in FIG. 2, one field iron core 3A and the other field iron core 3B are composed of a core hub 3b having a through hole 3a (see FIG. 2) in the radial center portion, and a radially outer peripheral portion of the core hub 3b. A plurality of (eight in this embodiment) claw-shaped magnetic poles 3c protruding in the axial direction are provided.
The core hub 3b is integrally provided with a boss portion 3b1 (see FIG. 1) protruding to one side in the axial direction, and a field winding 4 is wound between the boss portion 3b1 and a plurality of claw-shaped magnetic poles 3c. Winding space is ensured.

The plurality of claw-shaped magnetic poles 3c are provided at substantially equal intervals in the circumferential direction with respect to the core hub 3b, and are provided in a substantially V shape in which the width in the circumferential direction gradually decreases from the base end portion connected to the core hub 3b toward the distal end portion. Yes. Further, as shown in FIGS. 2 and 5, each claw-shaped magnetic pole 3c is provided with a pair of engaging portions 3c1 that project from the outer peripheral portions of both side surfaces in the circumferential direction in a hook shape in the circumferential direction.
As shown in FIG. 1, the above-described field core 3A and field core 3B have the end faces of both boss portions 3b1 butted in the axial direction, and the claw-shaped magnetic poles 3c are spaced apart from each other by a predetermined distance in the circumferential direction. The rotating shaft 2 is inserted into the through hole 3a of the core hub 3b and fixed to the rotating shaft 2.

  As shown in FIG. 1, the field winding 4 is wound around the outer periphery of both boss portions 3b1 of the field cores 3A and 3B via an insulating spool 9. Both ends of the winding start and end of the field winding 4 are connected to lead wires 10 and 11, respectively, and the other end portion of the rotating shaft 2 (the end on the non-pulley side) is connected to the lead wires 10 and 11, respectively. Are electrically connected to a set of slip rings 12. A field current is supplied to the field winding 4 from a battery (not shown) via a brush (not shown) arranged on the outer periphery of the slip ring 12. When a field current flows through the field winding 4, all the claw-shaped magnetic poles 3c provided on one field iron core 3A are magnetized to the S pole (or N pole) and provided to the other field iron core 3B. The plurality of claw-shaped magnetic poles 3c thus formed are all magnetized to the N pole (or S pole).

The cooling fans 5 and 6 include a front-side cooling fan 5 fixed to the end surface of the core hub 3b of one field iron core 3A by resistance welding or the like, and a resistance welding or the like to the end surface of the core hub 3b of the other field core 3B. The rear cooling fan 6 is fixed.
As shown in FIG. 5, the magnet 7 has a radial dimension between a locking portion 3c1 provided on the claw-shaped magnetic pole 3c and a support ring 8 arranged on the inner peripheral side of the claw-shaped magnetic pole 3c, The claw-shaped magnetic pole 3c is inserted in a magnet insertion space defined by the circumferential dimension between the side surfaces of the claw-shaped magnetic poles 3c adjacent to each other, and the surface facing the side surface of the claw-shaped magnetic pole 3c has the same polarity as the claw-shaped magnetic pole 3c. It is magnetized in the same way. That is, the magnet 7 is magnetized in such a direction as to reduce the leakage magnetic flux between the claw-shaped magnetic poles 3c adjacent to each other. As this magnet 7, for example, a rare earth magnet, a ferrite sintered magnet, or the like can be used, and the entire shape thereof is formed in a substantially rectangular parallelepiped.

The support ring 8 is made of a non-magnetic material such as stainless steel or resin, and as shown in FIG. 4, a plurality of magnet support portions 8a for individually supporting the plurality of magnets 7 and the plurality of magnet support portions 8a. And a connecting portion 8b for connecting the two in a ring shape.
The magnet support portion 8a has a flat surface that supports the magnet 7, that is, a contact surface with the magnet 7, and the length in the direction corresponding to the longitudinal direction of the magnet 7 is the width of the connecting portion 8b ( Longer than the circumferential direction of the support ring 8). The length of the magnet support portion 8a may be longer than the length of the magnet 7. However, even if the length is unnecessarily long, only the material is wasted. Therefore, the length is necessarily longer than the length of the magnet 7. There is no. That is, as long as the magnet 7 can be stably supported, it may be shorter than the length of the magnet 7. As an example of the magnet support portion 8a, the magnet support portion 8a may have a shape and an area substantially equal to the shape and area of the inner peripheral surface of the magnet 7 supported by the magnet support portion 8a.

The magnet support portion 8a is disposed with a predetermined inclination in the circumferential direction with respect to the connecting portion 8b, and adjacent magnet support portions 8a are inclined in directions opposite to each other. That is, the plurality of magnet support portions 8a are inclined in the same direction every other direction corresponding to the assembly direction of the magnets 7.
Further, the magnet support portion 8 a is provided with guide portions 8 c at both ends in a direction corresponding to the longitudinal direction of the magnet 7. The guide portion 8c is arranged in the radial direction of the support ring 8 so that the corner portions of the magnet 7 do not hit the end portions of the claw-shaped magnetic pole 3c and the magnet support portion 8a when the magnet 7 is inserted into the magnet insertion space. It is bent inward. That is, the guide portion 8c is provided to facilitate insertion of the magnet 7 into the magnet insertion space. In addition, the guide part 8c does not necessarily need to be provided in the both ends of the magnet support part 8a, and if the insertion direction of the magnet 7 is specified in one direction, only one end part is matched to that direction. It can also be provided.

  As shown in FIG. 5, the connecting portion 8b is arranged in an arc shape along the inner peripheral surface of the claw-shaped magnetic pole 3c, and is formed on the inner peripheral surface of one claw-shaped magnetic pole 3c as shown in FIG. The step is arranged between the step and the step formed on the inner peripheral surface of the other claw-shaped magnetic pole 3c, and movement in the axial direction (left-right direction in the drawing) is restricted by both steps. However, when the field iron core 3A and the field iron core 3B are combined, the connecting portion 8b is axially positioned between the two steps so that no gap (air gap) is generated between the boss portions 3b1 of the two. It is configured to be able to move slightly.

  That is, as shown in FIG. 4, in the connecting portion 8b, the portion where the recess 8b1 is formed on one side in the width direction (the upper side in the drawing) and the portion where the recess 8b1 is not provided are alternately sandwiched between the magnet support portions 8a. The width of the portion having the recess 8b1 is slightly smaller than that of the portion without the recess 8b1. Accordingly, when the other side in the width direction of the connecting portion 8b is brought into contact with one step of the claw-shaped magnetic pole 3c, a slight gap is formed between the one side having the recess 8b1 and the other step of the claw-shaped magnetic pole 3c. Secured. As a result, the axial position of the pair of field cores 3 is not affected by the width of the connecting portion 8b, and the boss 3b1 of the field core 3A and the boss 3b1 of the field core 3B are reliably secured in the axial direction. To form a magnetic circuit without an air gap between the boss portions 3b1.

Next, a method for assembling the magnet 7 will be described.
The magnet 7 is not fixed to the support ring 8 in advance, and is assembled separately from the support ring 8. That is, the support ring 8 is arranged in advance on the inner peripheral side of the claw-shaped magnetic pole 3c in a state where the pair of field cores 3 are combined before the magnet 7 is assembled. Then, as shown in FIG.2 and FIG.3, the magnet 7 is inserted and assembled in a magnet insertion space from its longitudinal direction. At this time, the magnet 7 is inserted with a slight allowance relative to the radial dimension between the locking portion 3c1 (see FIG. 5) of the claw-shaped magnetic pole 3c and the magnet support portion 8a of the support ring 8. That is, in the state where the inner peripheral surface in the radial direction is in contact with and supported by the magnet support portion 8a, the magnet 7 has both shoulder portions of the outer peripheral surface on the inner surface of the locking portion 3c1 provided on the claw-shaped magnetic pole 3c. When pressed, movement outward in the radial direction is restricted.

Further, the magnet 7 is formed such that the circumferential dimension of the magnet 7 is slightly smaller than the circumferential dimension between the side surfaces of the claw-shaped magnetic poles 3c adjacent in the circumferential direction so that the magnet 7 can be inserted into the magnet insertion space without difficulty. For this reason, as shown in FIG. 5, there is a gap S between the circumferential side surface of the magnet 7 and the side surface of the claw-shaped magnetic poles 3c. In order to fill this gap S, an impregnating material 13 such as an epoxy resin may be filled into the gap S as shown in FIG. Thereby, since the magnet 7 can be fixed by the impregnating material 13, the magnet 7 can be held in a more stable state.
In the above embodiment, an example in which the magnet support portion 8a of the support ring 8 is formed with a flat surface has been described. However, as shown in FIGS. 7 and 8, the magnet support portion 8a has the same curvature as the connection portion 8b. You may form in circular arc shape. Also in this case, as shown in FIG. 8, the gap S generated between the side surface of the magnet 7 and the side surface of the claw-shaped magnetic pole 3c may be filled with an impregnating material 13 such as epoxy resin.

(Effect of Example 1)
The size and position of the magnet insertion space in which the magnet 7 is inserted are greatly influenced by the processing accuracy of the claw-shaped magnetic pole 3c provided in the field iron core 3 and the assembly accuracy of the claw-shaped magnetic pole 3c. In other words, if variations occur in the processing accuracy of the claw-shaped magnetic pole 3c and the assembly accuracy of the claw-shaped magnetic pole 3c, the magnet insertion spaces at a plurality of locations may vary in different dimensions. On the other hand, in the rotor 1 of this embodiment, since the plurality of magnets 7 are not fixed to the support ring 8, the support ring 8 is first arranged on the inner peripheral side of the claw-shaped magnetic pole 3c. Thereafter, the plurality of magnets 7 can be individually inserted into the magnet insertion space and assembled. For this reason, even if the processing accuracy of the claw-shaped magnetic pole 3c and the assembly accuracy of the claw-shaped magnetic pole 3c vary, a plurality of magnets 7 are individually inserted into the magnet insertion space according to the size and position of each magnet insertion space. Can be assembled.

According to said structure, since an excessive force is not applied to the magnet 7, it can prevent that the magnet 7 is damaged at the time of an assembly | attachment or in use. As a result, when compared with the prior art (Patent Document 1) in which a plurality of magnets 7 are fixed to the support ring 8 in advance, it is not necessary to form a magnet assembly. It is not necessary to position the positional relationship with high accuracy, and it is not necessary to increase the component accuracy and assembly accuracy on the field iron core 3 side, so that the cost can be reduced accordingly.
The magnet 7 is inserted with a slight allowance with respect to the radial dimension between the locking portion 3c1 of the claw-shaped magnetic pole 3c and the magnet support portion 8a of the support ring 8. That is, since the magnet 7 is in contact with both the locking portion 3c1 of the claw-shaped magnetic pole 3c and the magnet support portion 8a of the support ring 8, the magnet 7 is more reliably fixed against centrifugal force stress.

Furthermore, when the impregnating material 13 is filled between the side surface of the magnet 7 and the side surface of the claw-shaped magnetic pole 3c, the magnet 7 can be fixed in a more stable state by the impregnating material 13, so that the fixing reliability of the magnet 7 is improved. Further improvement.
The support ring 8 of the present embodiment can have a large contact area between the magnet support portion 8a and the magnet 7 by making the magnet support portion 8a a flat surface. As a result, the fixation of the magnet 7 is stabilized and the contact pressure between the magnet 7 and the magnet support portion 8a is reduced, so that the reliability of the support ring 8 and the magnet 7 is also improved.
Further, since the support ring 8 has the magnet support portion 8a longer (longer) than the width of the connecting portion 8b, the magnet 7 can be stably pressed against the locking portion 3c1 of the claw-shaped magnetic pole 3c. The reliability against centrifugal force stress is improved.

Furthermore, the following effects can be obtained by appropriately reducing the width of the connecting portion 8b with respect to the magnet support portion 8a.
As shown in FIG. 9, the support ring 8 of the present embodiment can be considered as a double-supported beam having points A and B in the figure as fulcrums. In the double-supported beam model, as shown in FIG. 10, the fulcrum portion (point A or point B) corresponds to the connecting portion 8b, and the portion of the beam 14 corresponds to the magnet support portion 8a. Also, point C in the figure is a load point, and the load generated at this load point is equal to the elastic force F of the beam 14 (the force pressing the magnet 7 against the locking portion 3c1 of the claw-shaped magnetic pole 3c). It is represented by Formula (1).
F = k × δ ………………………………… (1)
Here, k is the spring constant (N / mm) of the beam 14, and δ is the deflection amount (mm) of the beam 14.

Further, the spring constant k of the beam 14 in this model is obtained from the following equation (2).
k = E × b × h ³ / (2 × L ³ ) (2)
However, E: Young's modulus (N / mm ² ) of the beam material, b: width (mm) of the beam 14, h: thickness (mm) of the beam 14, and L: length (mm) of the beam 14.
Therefore, by reducing the width of the connecting portion 8b (the width b of the beam 14), the spring constant is lowered, and the elastic force F against the deflection δ of the beam 14 is as shown in FIG.
The amount of deflection of the beam 14 also varies depending on the size of the magnet 7 and the size variation of the claw-shaped magnetic pole 3c. However, if the spring constant is small, variation in the elastic force of the beam 14 can be suppressed as shown in FIG. Therefore, it is possible to obtain a stable elastic force. Although it is clear from the above formula (2), the same effect can be obtained even if the length h of the beam 14 and the Young's modulus E of the beam material are reduced or the length L of the beam 14 is increased. Obtainable.

FIG. 12 is a plan view showing a method for assembling the magnet 7.
Example 1 describes an example in which a support ring 8 is disposed in advance on the inner peripheral side of the claw-shaped magnetic pole 3c in a state where a pair of field iron cores 3 are combined, and then the magnet 7 is inserted into a magnet insertion space and assembled. However, in the second embodiment, an example in which the magnet 7 is assembled before the pair of field cores 3 are combined will be described.
First, the support ring 8 is disposed on one of the pair of field cores 3, for example, on the inner peripheral side of the claw-shaped magnetic pole 3c of the field core 3A.
Subsequently, as shown in FIG. 12, the magnet 7 is inserted into the radial space defined by the radial dimension between the locking portion 3c1 provided on the claw-shaped magnetic pole 3c and the magnet support portion 8a. At this time, since the magnet 7 is inserted with a slight tightening margin with respect to the radial dimension between the locking portion 3c1 of the claw-shaped magnetic pole 3c and the magnet support portion 8a, the magnet 7 does not easily fall off.

Thereafter, the magnet 7 is held between the claw-shaped magnetic pole 3c of the field core 3A and the claw-shaped magnetic pole 3c of the field core 3B by combining the other field core (field core 3B).
Also in the assembling method shown in the second embodiment, as in the first embodiment, the plurality of magnets 7 are individually assembled after the support ring 8 is first disposed on the inner periphery of the claw-shaped magnetic pole 3c. Therefore, an excessive force is not applied to the magnet 7, and the magnet 7 can be prevented from being damaged during assembly or use. Further, it is not necessary to position the positional relationship between the plurality of magnets 7 and the support ring 8 with high accuracy, and it is not necessary to increase the component accuracy and assembly accuracy on the field iron core 3 side. Can be suppressed.

FIG. 13 is a cross-sectional view of the claw-shaped magnetic pole 3 c, the magnet 7, and the support ring 8.
In Example 3, the magnet 7 is accommodated in a holder 15 formed in a box shape from a nonmagnetic material (for example, stainless steel, resin, etc.), and the entire surface of the magnet 7 is surrounded by the holder 15. Further, as shown in FIG. 15, the holder 15 is provided with a projection 15 a for positioning with respect to the magnet support portion 8 a of the support ring 8. On the other hand, the magnet support portion 8a is provided with a positioning hole 8a1 that fits into the protrusion 15a provided on the holder 15. By fitting the positioning hole 8a1 and the projection 15a, the magnet 7 can be positioned with respect to the magnet support portion 8a, so that the positional deviation of the magnet 7 in the insertion direction of the magnet 7 can be particularly reliably prevented.
According to the configuration of the third embodiment, since the magnet 7 is accommodated in the holder 15, the strength of the magnet 7 against centrifugal force stress increases, and even if the magnet 7 is broken, It is possible to prevent debris from scattering. In addition, although the holder 15 shown in the present embodiment surrounds the entire surface of the magnet 7, for example, it may have a shape that covers at least the outer peripheral surface of the magnet 7 on the outer side in the radial direction.

As in the first embodiment, the support ring 8 may have a magnet support portion 8a having a flat surface (see FIG. 13) or an arc shape having the same curvature as the connecting portion 8b (see FIG. 14).
Furthermore, the support ring 8 can also provide a level | step difference between the connection part 8b and the magnet support part 8a. Specifically, as shown in FIGS. 16 and 17, the magnet 7 is projected to the engaging portion 3c1 of the claw-shaped magnetic pole 3c by projecting the magnet support portion 8a outward in the radial direction with respect to the connecting portion 8b. Pressed. In this case, the magnet 7 can be stably fixed by appropriately matching the height of the magnet support portion 8a with respect to the connecting portion 8b according to the thickness (diameter dimension) of the magnet 7.

(Example 1) which is sectional drawing of the rotor of a rotary electric machine. It is a perspective view of a rotor. It is a side view of a rotor. It is a perspective view of a support ring. It is sectional drawing of a claw-shaped magnetic pole, a magnet, and a support ring. It is sectional drawing of a claw-shaped magnetic pole, a magnet, and a support ring. It is sectional drawing of a claw-shaped magnetic pole, a magnet, and a support ring. It is sectional drawing of a claw-shaped magnetic pole, a magnet, and a support ring. It is sectional drawing of a claw-shaped magnetic pole, a magnet, and a support ring. It is a model figure of a double-supported beam. It is a graph which shows the relationship between the amount of bending of a beam, and elastic force. (Example 2) which is a side view of one field iron core. (Example 3) which is sectional drawing of a nail | claw-shaped magnetic pole, a magnet, and a support ring. It is sectional drawing of a claw-shaped magnetic pole, a magnet, and a support ring. It is a perspective view of a support ring. It is sectional drawing of a claw-shaped magnetic pole, a magnet, and a support ring. It is sectional drawing of a claw-shaped magnetic pole, a magnet, and a support ring.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotor 2 Rotating shaft 3 Field iron core 3A One field iron core 3B The other field iron core 3c Claw-shaped magnetic pole 3c1 Locking part provided in claw-shaped magnetic pole 4 Field winding 7 Magnet 8 Support ring 8a Support ring Magnet support part 8b Linking part of support ring 8c Guide part provided at end of magnet support part 13 Impregnation material 15 Holder (nonmagnetic member surrounding the outer peripheral surface of the magnet)

Claims (12)

A pair of field iron cores having a plurality of claw-shaped magnetic poles and being combined with each other so that the claw-shaped magnetic poles are alternately meshed with each other at a predetermined interval in the circumferential direction;
A field winding wound around the pair of field cores;
A plurality of permanent magnets arranged between side surfaces of the claw-shaped magnetic poles adjacent in the circumferential direction and magnetized in a direction to reduce leakage magnetic flux between the adjacent claw-shaped magnetic poles;
A non-magnetic support ring disposed on the inner peripheral side of the plurality of permanent magnets,
The claw-shaped magnetic pole is a rotor of a rotating electrical machine provided with a locking portion protruding in a hook shape in the circumferential direction from the circumferential side surface outer circumferential portion,
The permanent magnet is disposed between the side surfaces of the claw-shaped magnetic poles adjacent to each other in the circumferential direction in a state where the support ring is arranged in advance on the inner peripheral side of the claw-shaped magnetic poles provided on the pair of field cores. In addition, the inner peripheral side of the permanent magnet is supported by the support ring, and the movement of the permanent magnet to the outside in the radial direction is restricted by the locking portion provided on the claw-shaped magnetic pole. A rotor of a rotating electrical machine that is characterized. A rotor for a rotating electrical machine according to claim 1,
A magnet insertion space is defined by a radial dimension between the locking portion provided on the claw-shaped magnetic pole and the support ring and a circumferential dimension between side surfaces of the claw-shaped magnetic poles adjacent in the circumferential direction. ,
The support ring is disposed on the inner peripheral side of each claw-shaped magnetic pole provided in the pair of field cores, and then the permanent magnet is inserted into the magnet insertion space from its longitudinal direction and assembled. A method for manufacturing a rotor of a rotating electrical machine. A pair of field iron cores having a plurality of claw-shaped magnetic poles and being combined with each other so that the claw-shaped magnetic poles are alternately meshed with each other at a predetermined interval in the circumferential direction;
A field winding wound around the pair of field cores;
A plurality of permanent magnets arranged between side surfaces of the claw-shaped magnetic poles adjacent in the circumferential direction and magnetized in a direction to reduce leakage magnetic flux between the adjacent claw-shaped magnetic poles;
A non-magnetic support ring disposed on the inner peripheral side of the plurality of permanent magnets,
The claw-shaped magnetic pole is a rotor of a rotating electrical machine provided with a locking portion protruding in a hook shape in the circumferential direction from the circumferential side surface outer circumferential portion,
The support ring is disposed in advance on the inner peripheral side of the claw-shaped magnetic pole provided in one of the pair of field cores, and then the locking portion provided in the claw-shaped magnetic pole and the The permanent magnet is inserted into a radial space defined by a radial dimension between the permanent magnet and the support ring, and an inner peripheral side of the permanent magnet is supported by the support ring. A method of manufacturing a rotor of a rotating electrical machine, characterized in that the movement to the outside in the radial direction is maintained, and then the other field core is combined. In the rotor of any one of the rotating electrical machines according to claims 1 to 3,
The support ring includes a plurality of magnet support portions that individually support the plurality of permanent magnets, and a connection portion that connects the plurality of magnet support portions in an annular shape.
The magnet support portion is provided such that a length in a direction corresponding to a longitudinal direction of the permanent magnet is longer than a width of the connection portion (a dimension in a direction orthogonal to a circumferential direction of the support ring). Rotating electrical machine rotor. In the rotor of the rotating electrical machine according to claim 4,
The rotor for a rotating electrical machine, wherein the magnet support portion has a flat surface for supporting the permanent magnet. In the rotor of the rotating electrical machine according to claim 4 or 5,
The rotor of a rotating electrical machine, wherein the magnet support portion has a shape and an area substantially equal to a shape and an area of an inner peripheral surface of the permanent magnet supported by the magnet support portion. In the rotor of any one of the rotating electrical machines according to claim 4,
In the rotating electrical machine, the magnet support portion is provided with a guide portion that is bent inward in the radial direction at at least one of the ends in the direction corresponding to the longitudinal direction of the permanent magnet. Rotor. In the rotor of any one of the rotating electrical machines according to claims 4 to 7,
In the state where the inner peripheral surface of the permanent magnet is supported by being in contact with the magnet support portion, both shoulder portions of the outer peripheral surface are in contact with the inner surface of the locking portion provided on the claw-shaped magnetic pole and are in the radial direction. A rotor of a rotating electrical machine, characterized in that movement to the outside is restricted. In the rotor of the rotating electrical machine according to claim 8,
An impregnation material is filled between a circumferential side surface of the permanent magnet and a side surface of the claw-shaped magnetic poles. In the rotor of any one of the rotating electrical machines according to claims 4 to 7,
A rotor of a rotating electrical machine, wherein an impregnation material is filled between the permanent magnet, the magnet support portion, and the claw-shaped magnetic pole. In the rotor of any one of the rotating electrical machines according to claim 1,
A rotor of a rotating electrical machine, wherein the permanent magnet has at least a radially outer peripheral surface surrounded by a nonmagnetic member. In the rotor of the rotating electrical machine according to claim 11,
The rotor of a rotating electrical machine, wherein the permanent magnet is accommodated in a holder formed in a box shape by the non-magnetic member.

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