JP4697292B2 - Rotating electrical machine rotor - Google Patents

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, patent document 1 is well-known as AC generators for motor vehicles etc., for example.
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.
In this prior art, a plurality of permanent magnets are fixed to the outer peripheral surface of a magnet support ring made of a non-magnetic material with an adhesive or the like to constitute a magnet assembly, and are assembled to a pole core in the state of this magnet assembly.
In addition, the claw-shaped magnetic pole is provided with a flange protruding in the circumferential direction from the outer peripheral portion of the side surface in the circumferential direction, and the outer peripheral surface shoulder of the permanent magnet abuts on the inner peripheral surface of the flange, so that the rotor rotates. The permanent magnet is restricted from jumping out in the centrifugal direction (outward in the radial direction).
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 magnet support ring, extremely high component accuracy and assembly accuracy are required. That is, in the state of the magnet assembly, the position of the permanent magnet is fixed with respect to the magnet support ring. Therefore, if the position where the permanent magnet is fixed to the magnet support ring is slightly deviated, it is excessive during assembly or during use. Stress can be applied to the magnet assembly and the permanent magnet and magnet support ring can be damaged.
Also, even if the accuracy of the magnet assembly (positional accuracy of the permanent magnet with respect to the magnet support ring) is good, if there is variation in the processing accuracy of the claw-shaped magnetic poles, the claw-shaped adjacent to the circumferential direction with a pair of pole cores combined Even if there is enough space to insert a permanent magnet between magnetic poles (referred to as a magnet insertion space), the position of the magnet insertion space and the permanent magnet fixed to the magnet support ring are misaligned. If it is, the permanent magnet may not be inserted into the magnet insertion space.

As described above, in the invention according to Patent Document 1, in order to comfortably insert a plurality of permanent magnets fixed to the magnet support ring into the magnet insertion space, the component accuracy on the pole core side (especially the claw-shaped magnetic pole) In addition to machining accuracy and assembly accuracy, the accuracy of the magnet assembly is also required, which increases the cost.
Therefore, a method of assembling the permanent magnet without being fixed to the magnet support ring is conceivable. For example, there is a method in which a magnet support ring is assembled to a pole core in advance, and then a permanent magnet is inserted into a magnet insertion space. However, in this method, the movement of the permanent magnet can be restricted with respect to the rotation direction and the radial direction (inner diameter direction and outer diameter direction) of the rotor, but the permanent magnet is not fixed to the magnet support ring. It is difficult to restrict the movement (positional deviation) in the longitudinal direction of the permanent magnet itself, which is the magnet assembly direction.

  In other words, the permanent magnet is arranged between the claw-shaped magnetic poles adjacent to each other in the circumferential direction, so that the movement in the rotation direction is restricted. Movement in the direction (radially outer side) is restricted, and movement inward in the radial direction is restricted by the magnet support ring arranged on the inner peripheral side of the permanent magnet. However, in the assembling direction of the permanent magnet, a tightening margin is set between the magnet support ring and the hook portion of the claw-shaped magnetic pole. The movement is restricted by pressing against the buttocks. In this case, since the movement of the permanent magnet in the longitudinal direction is restricted only by the force that sandwiches the permanent magnet between the magnet support ring and the collar part, the permanent magnet moves in the assembly direction due to vibration during use. It cannot be reliably prevented.

In addition, it is possible to fix the permanent magnet by filling the gap between the permanent magnet and the claw-shaped magnetic pole with an impregnation material such as epoxy resin, but there is a concern about the deterioration of the fixing force due to the influence of the temperature change, It is difficult to reliably prevent the movement of the permanent magnet in the longitudinal direction only by the fixing force by the impregnating material.
The present invention has been made based on the above circumstances, and its purpose is to prevent movement of the permanent magnet in the assembling direction (displacement) without applying excessive force to the permanent magnet during assembling or during use. An object of the present invention is to provide a rotor of a rotating electrical machine that can be reliably prevented.

(Invention of Claim 1)
The present invention includes a pair of field iron cores which have a plurality of claw-shaped magnetic poles and are combined so that the claw-shaped magnetic poles are alternately meshed with each other at a predetermined interval in the circumferential direction. A plurality of magnets arranged in a direction to reduce the leakage magnetic flux between the adjacent claw-shaped magnetic poles disposed between the side surfaces of the claw-shaped magnetic poles adjacent to each other in the circumferential direction and the field winding wound around the magnetic core. And a magnet support ring that supports the permanent magnet from the inner peripheral side, and the claw-shaped magnetic pole includes a permanent magnet and a non-magnetic annular body disposed on the inner peripheral side of the plurality of permanent magnets. There is provided a flange portion protruding in the circumferential direction from the outer peripheral portion of the side surface in the circumferential direction, and this flange portion is a rotor of a rotating electrical machine in which movement of the permanent magnet in the centrifugal direction is restricted , and the magnet support ring is a permanent magnet The magnet support ring is arranged on the inner peripheral surface of the claw-shaped magnetic pole before the magnet is assembled. Individual space is restricted by the side surface and the flange portion of the claw-shaped magnetic poles have become the respective permanent magnets can be inserted arranged from the longitudinal direction, with respect to the magnet support ring, a permanent along the sides of the claw-shaped magnetic poles It has a positional deviation restricting means for regulating positional deviation in the longitudinal direction of the magnet.

According to the present invention, a plurality of permanent magnets are not fixed to the magnet support ring, but a magnet support ring is arranged in advance on the inner peripheral side of each claw-shaped magnetic pole provided in the pair of field cores. Then, a permanent magnet can be inserted and assembled from the longitudinal direction between the side surfaces of the claw-shaped magnetic poles adjacent in the circumferential direction. 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 permanent magnet can be prevented from being damaged during the assembly or during use.
Further, the permanent magnet is disposed between the claw-shaped magnetic poles adjacent to each other in the circumferential direction, so that the movement in the rotation direction is restricted, and the movement of the permanent magnet in the centrifugal direction is restricted by the flange portion of the claw-shaped magnetic pole. Movement inward in the radial direction is restricted by a magnet support ring arranged on the inner peripheral side of the magnet. Furthermore, since the positional deviation regulating means according to the present invention can regulate the positional deviation in the longitudinal direction (assembly direction) of the permanent magnet with respect to the magnet support ring, the permanent magnet has excellent fixing reliability, engine vibration, etc. The movement of the permanent magnet due to the can be reliably prevented.

(Invention of Claim 2)
2. The rotor of a rotating electrical machine according to claim 1, wherein the positional deviation restricting means includes a concave-convex fitting between a concave portion or a hole provided in one of the magnet support ring and the permanent magnet and a convex provided in the other. It is characterized by comprising.
According to the present invention, it is possible to realize the misregistration restricting means with a simple configuration by concave and convex fitting between the concave portion or the hole portion and the convex portion.

(Invention of Claim 3)
The rotor of the rotating electric machine according to claim 1, wherein the magnet support ring has a pair of locking pieces that are bent from both ends along the longitudinal direction of the permanent magnet to the end surface side in the longitudinal direction of the permanent magnet. The positional deviation restricting means is configured by gripping the permanent magnet in the longitudinal direction by the locking piece.
According to said structure, the position shift of the longitudinal direction of a permanent magnet can be reliably prevented with respect to a magnet support ring by hold | gripping a permanent magnet in a longitudinal direction with a pair of latching piece provided in the magnet support ring. Also, when the magnet support ring is assembled to the field core, either one of the pair of locking pieces is bent in advance, and then the permanent magnet is attached to the magnet supporting ring and the claw-shaped magnetic pole. After inserting between the hooks, the other locking piece can be bent. According to this procedure, when the permanent magnet is inserted between the magnet support ring and the hook portion of the claw-shaped magnetic pole, no stress is applied to the locking piece of the magnet support ring, so the permanent magnet is gripped in the longitudinal direction. The reliability of the pair of locking pieces is improved.

(Invention of Claim 4)
The rotor of any one of the rotating electrical machines according to claims 1 to 3, wherein the permanent magnet has a radially inner peripheral surface supported by a magnet support ring and receives the elasticity of the magnet support ring to receive a radial direction. It is assembled | attached in the state in which both the shoulder parts of the outer peripheral surface were pressed by the inner peripheral surface of the collar part. In this case, the permanent magnet is assembled with a slight allowance relative to the radial dimension between the collar portion of the claw-shaped magnetic pole and the magnet support ring. As a result, the permanent magnet has its inner peripheral surface supported by the magnet support ring, and both shoulder portions of the outer peripheral surface are pressed against the inner peripheral surface of the claw-shaped magnetic pole, so that the permanent magnet is free from permanent stress. Fixing of the magnet is more reliable and fixing reliability is improved.

(Invention of Claim 5)
5. The rotor of any one of the rotating electrical machines according to claim 1, wherein an impregnation material is filled between a circumferential side surface of the permanent magnet and a circumferential side surface of the claw-shaped magnetic pole.
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 generated between the side surface of the permanent magnet and the side surface of the claw-shaped magnetic pole, the permanent magnet can be held in a more stable state by filling the gap with an impregnating material (for example, epoxy resin). The fixing reliability of the permanent magnet is improved.

(Invention of Claim 6)
5. The rotor of any one of the rotating electrical machines according to claim 1, wherein an impregnation material is filled between the permanent magnet, the claw-shaped magnetic pole, and the magnet support ring.
If there is a gap between the permanent magnet and the claw-shaped magnetic pole and magnet support ring, the permanent magnet can be held in a more stable state by filling the gap with an impregnating material (for example, epoxy resin). The fixed reliability of is improved.

(Invention of Claim 7)
The present invention has a plurality of claw-shaped magnetic poles which are combined together so that the claw-shaped magnetic poles are alternately meshed with each other at a predetermined interval in the circumferential direction. It is arranged between the field windings wound around the field iron core and the side surfaces of the claw-shaped magnetic poles adjacent to each other in the circumferential direction, and is magnetized so as to reduce the leakage magnetic flux between the adjacent claw-shaped magnetic poles. A plurality of permanent magnets, a plurality of magnet cases made of a nonmagnetic member that protects at least the inner peripheral surface of the permanent magnets and holds the permanent magnets in the longitudinal direction, and a non-magnetic member disposed on the inner peripheral side of the magnet case A magnetic support ring that supports a permanent magnet from the inner periphery side through a magnet case, and the claw-shaped magnetic pole has a flange protruding in the circumferential direction from the outer peripheral portion of the side surface in the circumferential direction. The movement of the permanent magnet in the centrifugal direction is restricted by this flange. A rotor of a rotating electric machine, the magnet supporting ring is intended to be disposed on the inner peripheral surface of the claw-like magnetic pole before the magnet case is assembled, by the side surface and the flange portion of the magnet support ring and claw-like magnetic poles Each of the magnet cases can be inserted and arranged in the restricted individual space from the longitudinal direction, and the permanent magnet longitudinal direction along the side surface of the claw-shaped magnetic pole via the magnet case with respect to the magnet support ring It is characterized by having a positional deviation regulating means for regulating the positional deviation.

According to the present invention, the plurality of permanent magnets are not fixed to the magnet support ring via the magnet case, but are supported in advance on the inner peripheral side of each claw-shaped magnetic pole provided in the pair of field cores. After the ring is arranged, the permanent magnet held in the magnet case can be inserted and assembled from the longitudinal direction between the side surfaces of the claw-shaped magnetic poles adjacent in the circumferential direction. 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 permanent magnet can be prevented from being damaged during the assembly or during use.
In addition, the permanent magnet is disposed between the claw-shaped magnetic poles adjacent to each other in the circumferential direction, so that the movement in the rotation direction is restricted, and the movement of the permanent magnet in the centrifugal direction is regulated by the flange portion of the claw-shaped magnetic pole. Movement inward in the radial direction is restricted by a magnet support ring arranged on the inner peripheral side of the case. Furthermore, since the positional deviation regulating means according to the present invention can regulate the positional deviation in the longitudinal direction (assembly direction) of the permanent magnet with respect to the magnet support ring via the magnet case, the fixing reliability of the permanent magnet can be improved. It is excellent and can surely prevent the movement of the permanent magnet due to engine vibration.

(Invention of Claim 8)
The rotor of a rotating electrical machine according to claim 7, wherein the positional deviation restricting means is configured by concave and convex fitting between a concave portion or a hole provided in the magnet support ring and a convex provided in the magnet case. It is characterized by.
According to the present invention, it is possible to realize the misregistration restricting means with a simple configuration by concave and convex fitting between the concave portion or the hole portion and the convex portion.

(Invention of Claim 9)
The rotor of the rotating electrical machine according to claim 7, wherein the magnet case has a pair of end plate portions that protect both end faces in the longitudinal direction of the permanent magnet, and the magnet support ring extends along the longitudinal direction of the permanent magnet. It has a pair of locking pieces that bend from both ends to the end plate portion side of the magnet case, and the magnet case is gripped in the longitudinal direction by the pair of locking pieces to constitute a positional deviation regulating means.
According to the above configuration, the longitudinal displacement of the permanent magnet with respect to the magnet support ring can be reliably prevented by gripping the magnet case in the longitudinal direction by the pair of locking pieces provided on the magnet support ring. Also, when the magnet support ring is assembled to the field core, either one of the pair of locking pieces is bent in advance, and then the permanent magnet held in the magnet case is replaced with a magnet. After the insertion between the support ring and the collar portion of the claw-shaped magnetic pole, the procedure of bending the other locking piece can be taken. According to this procedure, when the permanent magnet is inserted between the magnet support ring and the hook portion of the claw-shaped magnetic pole, no stress is applied to the locking piece of the magnet support ring, so the permanent magnet is gripped in the longitudinal direction. The reliability of the pair of locking pieces is improved.

(Invention of Claim 10)
The rotor of the rotating electrical machine according to claim 7, wherein the magnet case is provided with a snap fit that engages with the magnet support ring along the longitudinal direction of the permanent magnet as a positional deviation restricting means. .
According to said structure, the position shift of the longitudinal direction of a permanent magnet can be easily controlled with respect to a magnet support ring by the snap fit provided in the magnet case.

(Invention of Claim 11)
The rotor of any of the rotating electrical machines according to any one of claims 7 to 10, wherein the permanent magnet has a radially inner peripheral surface supported by a magnet support ring via a magnet case, and the elasticity of the magnet support ring. In this case, both shoulder portions of the outer peripheral surface in the radial direction are assembled in a state where they are pressed against the inner peripheral surface of the collar portion.
In this case, the permanent magnet and the magnet case are assembled with a slight interference with respect to the radial dimension between the collar portion of the claw-shaped magnetic pole and the magnet support ring. As a result, the permanent magnet has its inner peripheral side supported by the magnet support ring via the magnet case, and both shoulder portions of the outer peripheral surface are pressed against the inner peripheral surface of the hook portion of the claw-shaped magnetic pole. The permanent magnet is more securely fixed against force stress, and the fixing reliability is improved.

(Invention of Claim 12)
The rotor of any of the rotating electrical machines according to any one of claims 7 to 10, wherein the magnet case is provided in a box shape surrounding the entire surface of the permanent magnet, and an inner peripheral case surface that protects the inner peripheral surface of the permanent magnet is provided. In addition to being supported by the support ring, the shoulders of the outer peripheral case surface that protects the outer peripheral surface of the permanent magnet are assembled in a state in which both shoulder portions are pressed against the inner peripheral surface of the buttock, receiving the elasticity of the magnet support ring. It is characterized by that.
According to the above configuration, since the entire surface of the permanent magnet is surrounded by the magnet case, the permanent magnet does not directly hit the claw-shaped magnetic pole or the magnet support ring when the permanent magnet is assembled, and the permanent magnet can be prevented from being damaged. In addition, since the magnet case is assembled with both shoulders of the outer case surface pressed against the inner peripheral surface of the collar, the fixing reliability against centrifugal force stress is improved and the permanent magnet is damaged by any chance. Even in this case, the permanent magnet can be prevented from being scattered by the magnet case.

(Invention of Claim 13)
The rotor of any of the rotating electrical machines according to any one of claims 7 to 11, wherein an impregnation material is filled between a circumferential side surface of the permanent magnet and a circumferential side surface of the claw-shaped magnetic pole.
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 generated between the side surface of the permanent magnet and the side surface of the claw-shaped magnetic pole, the permanent magnet can be held in a more stable state by filling the gap with an impregnating material (for example, epoxy resin). The fixing reliability of the permanent magnet is improved.

(Invention of Claim 14)
The rotor of the rotating electrical machine according to claim 12 is characterized in that an impregnation material is filled between a circumferential case surface of the magnet case and a circumferential side surface of the claw-shaped magnetic pole.
When there is a gap between the circumferential case surface of the magnet case and the circumferential side surface of the claw-shaped magnetic pole, the permanent magnet housed in the magnet case is more stable by filling the gap with an impregnating material (for example, epoxy resin). Since it can hold | maintain in the state which carried out, the fixed reliability of a permanent magnet improves.

(Invention of Claim 15)
The rotor of any of the rotating electrical machines according to any one of claims 7 to 12, wherein an impregnation material is filled between the magnet case, the claw-shaped magnetic pole, and the magnet support ring.
If there is a gap between the magnet case and the claw-shaped magnetic pole and magnet support ring, the permanent magnet can be held in a more stable state via the magnet case by filling the gap with an impregnating material (for example, epoxy resin). As a result, the fixing reliability of the permanent magnet is improved.

(Invention of Claim 16)
The rotor of any one of the rotating electrical machines according to any one of claims 7 to 12, wherein an impregnation material is filled between the magnet case and the permanent magnet, the claw-shaped magnetic pole, and the magnet support ring. When there is a gap between the magnet case and the permanent magnet, the claw-shaped magnetic pole, and the magnet support ring, the magnet case and the permanent magnet are more stable by filling the gap with an impregnation material (for example, epoxy resin). Therefore, the fixing reliability of the permanent magnet is improved.

  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. A plurality (16 in the present embodiment) of permanent magnets (hereinafter abbreviated as magnets 7) and a magnet support ring 8 that supports the magnets 7 from the radially inner peripheral side are formed.

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 protrude in the axial direction from a core hub 3b having a through hole 3a in the central portion in the radial direction and a radially outer peripheral portion of the core hub 3b. A plurality (eight in this embodiment) of claw-shaped magnetic poles 3c 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 FIG. 2, each claw-shaped magnetic pole 3c is provided with a pair of flange portions 3c1 protruding in the circumferential direction from the outer circumferential portions on both side surfaces in the circumferential direction.
As shown in FIG. 1, the field iron core 3A and the field iron core 3B have the end faces of the boss portions 3b1 butted in the axial direction, and the claw-shaped magnetic poles 3c have a predetermined interval 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 iron cores 3A and 3B via a spool 9 having an insulating property. 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.
The magnet 7 has a radial dimension between the flange 3c1 provided on the claw-shaped magnetic pole 3c and a magnet support ring 8 disposed on the inner peripheral side of the claw-shaped magnetic pole 3c, and a claw-shaped magnetic pole adjacent in the circumferential direction. It is inserted into a magnet insertion space defined by the circumferential dimension between the side surfaces of 3c, and the magnet side surface facing the side surface of the claw-shaped magnetic pole 3c is magnetized so as to have the same polarity as the claw-shaped magnetic pole 3c. . 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 (see FIGS. 3 and 4).

The magnet support ring 8 is made of a non-magnetic material such as stainless steel or resin, and as shown in FIG. 4, a plurality (16 in this embodiment) of magnet support portions 8a for supporting a plurality of magnets 7 individually. And a connecting portion 8b for connecting the plurality of magnet support portions 8a 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 magnet 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.

As shown in FIG. 4, 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 opposite directions. 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 has a diameter of the magnet support ring 8 so that the corner portion of the magnet 7 does not hit the end of the claw-shaped magnetic pole 3c or 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 may be provided.

  The connecting portion 8b is arranged in an arc shape along the inner peripheral surface of the claw-shaped magnetic pole 3c, and as shown in FIG. 1, the step formed on the inner peripheral surface of one claw-shaped magnetic pole 3c and the other step It is arrange | positioned between the level | step differences formed in the internal peripheral surface of the nail | claw-shaped magnetic pole 3c, and the movement of an axial direction (left-right direction of FIG. 1) is controlled by both level | step differences. However, when the field iron core 3A and the field iron core 3B are combined, the connecting portion 8b is pivoted between the two steps so that no gap (air gap) is generated between the end faces of the boss portions 3b1. It is configured to move a little in the direction.

  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 figure) and the portion without the recess 8b1 are alternately sandwiched by the magnet support portion 8a. The width of the portion having the recess 8b1 is slightly smaller than that of the portion without the recess 8b1. Therefore, 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 magnet support ring 8 in advance, and is assembled separately from the magnet support ring 8. That is, the magnet 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. Thereafter, as shown in FIG. 3, the magnet 7 is inserted into the magnet insertion space from the longitudinal direction of the magnet 7 and assembled. At this time, the movement of the magnet 7 in the longitudinal direction (the insertion direction of the magnet 7) is restricted with respect to the magnet support ring 8 by the positional deviation restricting means according to the present invention.
As shown in FIG. 5, the misregistration restricting means is configured by concave and convex fitting between a hole 8 d formed in the magnet support portion 8 a of the magnet support ring 8 and a convex portion 7 a provided in the magnet 7. Alternatively, as shown in FIG. 6, the magnet 7 may be provided with a concave portion 7b, and a convex portion 8e fitted to the concave portion 7b may be provided on the magnet support portion 8a.

The magnet 7 is inserted with a slight allowance with respect to the radial dimension between the flange portion 3c1 of the claw-shaped magnetic pole 3c and the magnet support portion 8a of the magnet support ring 8. That is, as shown in FIG. 7, the magnet 7 has both the shoulder portions of the outer peripheral surface provided on the claw-shaped magnetic pole 3c with the radially inner peripheral surface being in contact with and supported by the magnet support portion 8a. It is pressed against the inner surface of the flange 3c1 to restrict movement in the centrifugal direction (radially outward).
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. 7, a gap S is generated between the circumferential side surface of the magnet 7 and the circumferential side surface of the claw-shaped magnetic pole 3c. It can also be filled with an impregnating material 13 such as resin.

(Effect of Example 1)
The size and position of the magnet insertion space in which the magnet 7 is inserted are greatly affected by the processing accuracy and assembly accuracy of the claw-shaped magnetic pole 3 c provided in the field core 3. In other words, if variations occur in the processing accuracy and 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 magnet support ring 8 in advance, the magnet support ring 8 is 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 and assembly accuracy of the claw-shaped magnetic pole 3c vary, a plurality of magnets 7 can be individually inserted and assembled in the magnet insertion space according to the size and position of each magnet insertion space. .

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 magnet support ring 8 in advance, it is not necessary to configure a magnet assembly in this embodiment. Since it is not necessary to position the positional relationship with the magnet support ring 8 with high accuracy, and there is no need to increase the component accuracy and assembly accuracy on the field iron core 3 side, the cost can be reduced accordingly.
Moreover, the magnet 7 of the present embodiment can prevent the positional deviation in the longitudinal direction (the assembling direction of the magnet 7) with respect to the magnet support 8a by the positional deviation regulating means of the present invention. That is, as shown in FIG. 5, the convex portion 7a provided on the magnet 7 is fitted into the hole 8d formed in the magnet support portion 8a, so that the magnet 7 is moved in the longitudinal direction with respect to the magnet support portion 8a. Since the positioning is possible, the movement of the magnet 7 due to engine vibration or the like can be reliably prevented.

Further, the magnet 7 is inserted with a slight allowance with respect to the radial dimension between the flange 3c1 of the claw-shaped magnetic pole 3c and the magnet support 8a of the magnet support ring 8. That is, the magnet 7 is supported on the inner peripheral side by the magnet support portion 8a and receives the elasticity of the magnet support ring 8, and both shoulder portions of the outer peripheral surface in the radial direction are the inner periphery of the flange portion 3c1 of the claw-shaped magnetic pole 3c. It is assembled in a state where it is pressed against the surface. Thereby, the fixed reliability of the magnet 7 with respect to centrifugal force stress improves.
The magnet 7 is inserted with a slight gap S (see FIG. 7) between the claw-shaped magnetic poles 3c adjacent to each other in the circumferential direction, but between the side surface of the magnet 7 and the side surface of the claw-shaped magnetic pole 3c. By filling the resulting gap S with the impregnating material 13 (see FIG. 8), movement in the rotational direction can be prevented.

FIG. 9 is a perspective view showing the configuration of the positional deviation restricting means according to the present invention.
As shown in FIG. 9, the magnet support ring 8 of this embodiment has a pair of locking pieces 8 f that bend from both ends of the magnet support portion 8 a along the longitudinal direction of the magnet 7 to the end face side in the longitudinal direction of the magnet 7. The pair of locking pieces 8f constitutes the positional deviation restricting means of the present invention.
As shown in FIG. 10, the pair of locking pieces 8f is formed by bending one of the locking pieces 8f in advance, inserting the magnet 7 into the magnet insertion space, and then assembling the other locking piece. By bending 8f, the magnet 7 can be held in the longitudinal direction. According to this assembly procedure, when the magnet 7 is inserted into the magnet insertion space, no stress is applied to the locking piece 8f, so that the function of gripping the magnet 7 by the pair of locking pieces 8f does not deteriorate. The reliability of the locking piece 8f is improved.

FIG. 11 is a perspective view of the magnet support ring 8 and the magnet case 14 that houses the magnet 7 therein. As shown in FIG. 11, this embodiment has a magnet case 14 for protecting the magnet 7, and is formed on a convex portion 14 a provided on the magnet case 14 and a magnet support portion 8 a of the magnet support ring 8. The positional deviation restricting means of the present invention is constituted by the hole portion 8d.
The magnet case 14 is formed in a box shape with a nonmagnetic material such as stainless steel or resin, for example, and covers the entire surface of the magnet 7 by accommodating the magnet 7 therein. As shown in FIG. 12, the magnet case 14 is configured such that a convex portion 14a provided in the magnet case 14 is fitted into a hole 8d formed in the magnet support portion 8a, so that the magnet support portion 8a is magnetized. The case 14 can be positioned, and as a result, the displacement of the magnet 7 in the longitudinal direction with respect to the magnet support portion 8a can be restricted.

The magnet case 14 is inserted with a slight allowance for the radial dimension between the flange 3c1 of the claw-shaped magnetic pole 3c and the magnet support 8a of the magnet support ring 8. That is, as shown in FIG. 13, the magnet case 14 has an inner peripheral case surface that protects the inner peripheral surface of the magnet 7 supported by the magnet support portion 8 a of the magnet support ring 8 and the elasticity of the magnet support ring 8. In response, both shoulder portions of the outer peripheral case surface that protects the outer peripheral surface of the magnet 7 are assembled while being pressed against the inner peripheral surface of the flange portion 3c1 provided on the claw-shaped magnetic pole 3c.
Further, the magnet case 14 is formed such that the circumferential dimension of the magnet case 14 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 case 14 can be inserted into the magnet insertion space without difficulty. Yes. For this reason, as shown in FIG. 13, a gap S is generated between the circumferential side surface of the magnet case 14 and the circumferential side surface of the claw-shaped magnetic pole 3c. It can also be filled with an impregnating material 13 such as an epoxy resin.

Since the magnet 7 of this embodiment is housed in the magnet case 14 formed in a box shape, the strength against the centrifugal stress is increased, and even if the magnet 7 is broken, the fragments of the magnet 7 are scattered. Can be prevented.
Further, in the present embodiment, the convex portion 14a provided in the magnet case 14 is fitted into the hole 8d formed in the magnet support portion 8a, so that the convex portion and the concave portion are processed in the magnet 7 itself. There is no need. Further, as described in the first embodiment, in the method in which the magnet 7 is provided with the convex portion 7a or the concave portion 7b and is fitted to the hole portion 8d or the convex portion 8e formed in the magnet support portion 8a, the concave / convex fitting between the two is performed. In this case, since stress is applied to the convex portions 7a and the concave portions 7b of the magnet 7, a part of the magnet 7 (particularly, corner portions of the convex portions 7a and the concave portions 7b) may be damaged. Then, there is no worry about that, and the magnet 7 is not damaged at the time of assembly.

FIG. 15 is a perspective view of the magnet support ring 8 and the magnet case 14 that houses the magnet 7 therein. This embodiment is an example in which a snap fit 14b is provided on the magnet case 14 as shown in FIG. The snap fit 14b is a well-known fastening means using elasticity, and as shown in FIG. 16, by engaging with the magnet support portion 8a along the longitudinal direction (left and right direction in the drawing) of the magnet support portion 8a, The positional deviation in the longitudinal direction of the magnet 7 with respect to the support portion 8a can be restricted.
Even in the configuration of the present embodiment, as in the case of the third embodiment, it is not necessary to process the convex portion 7a and the concave portion 7b on the magnet 7 itself. 7a and the corners of the recesses 7b) are not likely to be damaged.
In FIG. 15, the snap fit 14 b is provided in the magnet case 14, but the snap fit is provided in the magnet support portion 8 a of the magnet support ring 8, and a fitting hole for fitting the snap fit is provided in the magnet case 14. The misregistration can also be regulated by, for example.

FIG. 17 is a cross-sectional view showing the configuration of the positional deviation regulating means.
As in the case of the second embodiment, the positional deviation restricting means of the present embodiment is provided with a pair of locking pieces 8f at both ends of the magnet support portion 8a, and the pair of locking pieces 8f are used as end surfaces 14c of the magnet case 14. The magnet case 14 is gripped in the longitudinal direction by bending toward the end plate portion of the present invention.
In the second embodiment, the configuration in which the magnet case 14 is not provided, that is, the magnet 7 is gripped by the pair of locking pieces 8f in a bare state is described. However, as shown in FIG. Even in the configuration in which the magnet 7 is accommodated in the case 14, the position deviation restricting means by the pair of locking pieces 8f described in the second embodiment can be applied.

FIG. 18 is a cross-sectional view showing the configuration of the positional deviation regulating means.
The magnet case 14 described in the third to fifth embodiments is formed in a box shape surrounding the entire surface of the magnet 7, but in order to give the magnet case 14 the function of the positional deviation regulating means, for example, at least a magnet 7 may be a substantially plate-like magnet case 14 that protects the inner peripheral surface of the plate 7. However, when the magnet case 14 is substantially plate-shaped, it is necessary to fix the magnet 7 to the magnet case 14 with an adhesive or the like.
As shown in FIG. 18, the positional deviation restricting means of the present embodiment is a method of fitting the convex portion 14a provided on the magnet case 14 into the hole 8d formed in the magnet support portion 8a (described in the third embodiment). Or a method of providing a snap fit using elasticity in the magnet case 14 and engaging the snap fit with the magnet support portion 8a (the method described in the fourth embodiment).

(Modification)
In Example 1, although the magnet support part 8a of the magnet support ring 8 was demonstrated as a flat surface, it can also form in the circular arc shape which has the same curvature as the connection part 8b. In this case, the gap formed between the magnet 7 or the magnet case 14 and the magnet support portion 8a is filled with the impregnating material 13 such as an epoxy resin to fill the magnet 7 or the magnet case 14 in a more stable state. it can.
As reference examples to which the present invention is not applied, there are the following forms.
In Example 1, the magnet supporting ring 8 from the previously disposed on the inner peripheral side of the claw-shaped magnetic poles 3c, then to the procedure for assembling by inserting the magnet 7 from its longitudinally magnet insertion space is characterized On the other hand, the magnet support ring 8 and the magnet 7 can be integrally assembled to the field core 3 in a state where the positional deviation in the longitudinal direction of the magnet 7 with respect to the magnet support portion 8a is restricted. This is the same as in the second embodiment. That is, before the magnet support ring 8 is disposed on the inner peripheral side of the claw-shaped magnetic pole 3c, the magnet 7 is set on the magnet support portion 8a, the pair of locking pieces 8f are bent, and the magnet 7 is gripped. Both of them can be assembled to the field core 3 together.

Even in the case where the magnet case 14 is provided, the magnet support ring 8 and the magnet case 14 are integrated into the field core 3 in a state where the magnet case 14 is positioned in the longitudinal direction with respect to the magnet support portion 8a in the same manner as described above. It can also be assembled .

It 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. (Example 1) which is a perspective view of a magnet support ring and a magnet. It is sectional drawing which shows the structure of a positioning control means (Example 1). It is sectional drawing which shows the structure of a positioning control means (Example 1). (Example 1) which is sectional drawing of a nail | claw-shaped magnetic pole, a magnet, and a magnet support ring. (Example 1) which is sectional drawing of a nail | claw-shaped magnetic pole, a magnet, and a magnet support ring. (Example 2) which is a perspective view which shows the structure of a positioning control means. (Example 2) which is sectional drawing which shows the structure of a positioning control means. (Example 3) which is a perspective view of a magnet support ring and a magnet case. (Example 3) which is sectional drawing which shows the structure of a positioning control means. (Example 3) which is a sectional view of a claw-shaped magnetic pole, a magnet housed in a magnet case, and a magnet support ring. (Example 3) which is a sectional view of a claw-shaped magnetic pole, a magnet housed in a magnet case, and a magnet support ring. (Example 4) which is a perspective view of a magnet support ring and a magnet case. (Example 4) which is sectional drawing which shows the structure of a positioning control means. (Example 5) which is sectional drawing which shows the structure of a positioning control means. (Example 6) which is sectional drawing which shows the structure of a positioning control means.

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 Claw-shaped magnetic pole part 4 Field winding 7 Magnet (permanent magnet)
7a Convex part (positional deviation regulating means) provided on the magnet
8 Magnet support ring 8a Magnet support part of magnet support ring 8b Connection part of magnet support ring 8d Hole formed in magnet support part (positional deviation regulating means)
8e Convex part (positional deviation regulating means) provided on the magnet support part
8f A pair of locking pieces (positional deviation regulating means) provided on the magnet support portion
13 Impregnating material 14 Magnet case 14a Convex part (positional deviation regulating means) provided in the magnet case
14b Snap fit provided on the magnet case (positional displacement regulating means)
14c End face of magnet case (end plate part)

Claims (16)

A pair of field iron cores that have a plurality of claw-shaped magnetic poles and are combined so that the claw-shaped magnetic poles alternately mesh 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 annular body disposed on the inner peripheral side of the plurality of permanent magnets , comprising a magnet support ring that supports the plurality of permanent magnets from the inner peripheral side,
The said claw-shaped magnetic pole, the flange portion is provided protruding from the wall part of the circumferential direction in the circumferential direction, by the flange portion, a rotor of a rotating electric machine movement in the centrifugal direction of the permanent magnet is restricted ,
The magnet support ring is disposed on the inner peripheral surface of the claw-shaped magnetic pole before the permanent magnet is assembled, and is individually regulated by the magnet support ring, the side surface of the claw-shaped magnetic pole, and the flange portion. Each of the permanent magnets can be inserted and arranged in the space from the longitudinal direction,
A rotor of a rotating electrical machine, characterized by having a positional deviation regulating means for regulating a positional deviation in a longitudinal direction of the permanent magnet along a side surface of the claw-shaped magnetic pole with respect to the magnet support ring. In the rotor of the rotating electrical machine according to claim 1,
The positional deviation restricting means is configured by concave and convex fitting between a concave portion or a hole provided in one of the magnet support ring and the permanent magnet and a convex provided in the other. Rotor for rotating electrical machines. In the rotor of the rotating electrical machine according to claim 1,
The magnet support ring has a pair of locking pieces that are bent from both ends along the longitudinal direction of the permanent magnet to the end surface side in the longitudinal direction of the permanent magnet, and the permanent magnet is moved in the longitudinal direction by the pair of locking pieces. The rotor of a rotating electrical machine is characterized in that the position deviation restricting means is configured by gripping it on the rotor. In the rotor of any one of the rotating electrical machines according to claims 1 to 3,
The permanent magnet has a radially inner peripheral surface supported by the magnet support ring and receives the elasticity of the magnet support ring so that both shoulders of the radially outer peripheral surface are on the inner peripheral surface of the flange. A rotor of a rotating electric machine, wherein the rotor is assembled in a pressed state. In the rotor of any one of the rotating electrical machines according to claims 1 to 4,
A rotor of a rotating electrical machine, wherein an impregnation material is filled between a circumferential side surface of the permanent magnet and a circumferential side surface of the claw-shaped magnetic pole. In the rotor of any one of the rotating electrical machines according to claims 1 to 4,
An impregnating material is filled between the permanent magnet, the claw-shaped magnetic pole and the magnet support ring. A pair of field iron cores that have a plurality of claw-shaped magnetic poles and are combined so that the claw-shaped magnetic poles alternately mesh 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 plurality of magnet cases made of a non-magnetic member that protects at least the inner peripheral surface of the permanent magnet and holds the permanent magnet in the longitudinal direction;
A non-magnetic annular body disposed on the inner peripheral side of the magnet case, comprising a magnet support ring that supports the permanent magnet from the inner peripheral side through the magnet case;
The claw-shaped magnetic pole is provided with a flange protruding in the circumferential direction from the outer peripheral portion of the side surface in the circumferential direction, and is a rotor of a rotating electrical machine in which movement of the permanent magnet in the centrifugal direction is restricted by the flange. ,
The magnet support ring is disposed on the inner peripheral surface of the claw-shaped magnetic pole before the magnet case is assembled, and is individually controlled by the magnet support ring, the side surface of the claw-shaped magnetic pole, and the flange portion. Each of the magnet cases can be inserted and arranged in the space from the longitudinal direction,
Rotation of a rotating electrical machine characterized by having a positional deviation regulating means for regulating a positional deviation in the longitudinal direction of the permanent magnet along the side surface of the claw-shaped magnetic pole via the magnet case with respect to the magnet support ring. Child. In the rotor of the rotating electrical machine according to claim 7,
The rotor of a rotating electrical machine is characterized in that the positional deviation restricting means is configured by a concave-convex fitting between a concave portion or a hole provided in the magnet support ring and a convex provided in the magnet case. In the rotor of the rotating electrical machine according to claim 7,
The magnet case has a pair of end plate portions that protect both end surfaces of the permanent magnet in the longitudinal direction, and the magnet support ring is connected to the end portions of the magnet case from both ends along the longitudinal direction of the permanent magnet. A rotor of a rotating electrical machine having a pair of locking pieces bent to the side, and constituting the positional deviation regulating means by gripping the magnet case in the longitudinal direction by the pair of locking pieces. In the rotor of the rotating electrical machine according to claim 7,
The rotor of a rotating electrical machine, wherein the magnet case is provided with a snap fit that engages with the magnet support ring along the longitudinal direction of the permanent magnet as the positional deviation restricting means. In the rotor of any one of the rotating electrical machines according to claims 7 to 10,
The permanent magnet has a radially inner peripheral surface supported by the magnet support ring via the magnet case, and receives the elasticity of the magnet support ring so that both shoulders of the radial outer peripheral surface A rotor of a rotating electric machine, wherein the rotor is assembled in a state of being pressed against an inner peripheral surface of a part. In the rotor of any one of the rotating electrical machines according to claims 7 to 10,
The magnet case is provided in a box shape surrounding the entire surface of the permanent magnet, and an inner peripheral case surface protecting the inner peripheral surface of the permanent magnet is supported by the support ring, and the elasticity of the magnet support ring Accordingly, the rotor of the rotating electrical machine is assembled in a state where both shoulder portions of the outer peripheral case surface protecting the outer peripheral surface of the permanent magnet are pressed against the inner peripheral surface of the flange portion. In the rotor of any one of the rotating electrical machines according to claims 7 to 11,
A rotor of a rotating electrical machine, wherein an impregnation material is filled between a circumferential side surface of the permanent magnet and a circumferential side surface of the claw-shaped magnetic pole. The rotor of the rotating electrical machine according to claim 12,
A rotor of a rotating electrical machine, wherein an impregnation material is filled between a circumferential case surface of the magnet case and a circumferential side surface of the claw-shaped magnetic pole. In the rotor of any one of the rotating electrical machines according to claims 7 to 12,
A rotor of a rotating electrical machine, wherein an impregnation material is filled between the magnet case, the claw-shaped magnetic poles, and the magnet support ring. In the rotor of any one of the rotating electrical machines according to claims 7 to 12,
An impregnation material is filled between the magnet case and the permanent magnet, the claw-shaped magnetic pole, and the magnet support ring.

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