JP2009100490A - Rotary machine and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a rotor of a rotary machine, capable of keeping the engaging strength between teeth and a rotary shaft at sufficient strength against a centrifugal force by devising the engaging structure between the split teeth and the rotary shaft and enabling the teeth to easily be incorporated into the rotary shaft, and to obtain a manufacturing method thereof. <P>SOLUTION: First and second split cores 21, 28 are disposed adjacently in a circumferential direction in a compressed state on the external circumferential surface of a second shaft portion 4 of a rotary shaft 2 so as to be regulated in the movement in axial and dimensional directions while a fitting groove portion is fitted to a fitting protrusion and to be movable in the circumferential direction. A third split core 36 is disposed movably in an axial direction between the second split cores 28 so as to regulated in the movement in dimensional and circumferential directions by fitting a bulging portion 37a of an internal dimension side of a fastening portion 37 to a first space and fitting it to a fitting concave portion 33 formed on the fastening portion 29 of the second split core 28. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rotating machine such as an in-vehicle generator motor and a manufacturing method thereof, and more particularly to a rotor structure in which field windings are wound around a rotor core and a manufacturing method thereof.

  For example, a generator motor having a field winding is mounted on a vehicle and operates as a starter motor when the engine is started and operates as a generator while the engine is being driven. When used as a starter motor, high torque and high output are required to restart the engine instantly. As a means for obtaining a high torque, it is conceivable to increase the space factor of the field winding. In other words, increasing the space factor of the field winding leads to a reduction in the resistance of the field winding, and it becomes possible to increase the field current value under the condition of a constant power supply voltage, and the magnetomotive force of the rotor is reduced. Increases output, high output, and high torque.

  In the conventional electric motor, the rotor core is divided and configured for each tooth around which the field winding is wound, and the divided teeth are the first teeth having the engaging protrusions protruding inward in the radial direction of the rotor. The first teeth and the second teeth, each having a fitting concave portion with which the engaging convex portion of the first tooth is engaged, are fitted with the engaging convex portion. They are alternately arranged at equiangular intervals along the circumferential direction of the rotor while engaging the recesses (see, for example, Patent Document 1). In this conventional electric motor, the field winding can be wound around each of the first and second teeth before assembly, which makes it easier to wind the field winding and increases the space factor of the field winding. Can do.

JP 2003-134708 A

However, in the conventional electric motor, the first and second teeth are fixed by the engagement between the engaging protrusion having the extending direction radially inward and the fitting recess having the groove depth direction radially inward. Therefore, when a predetermined pulling force outward in the radial direction acts on the first teeth having the engaging protrusions, the first teeth are pulled out.
In this type of rotating machine, the centrifugal force acting on the rotor increases with the radius ratio, so the rotor structure in the conventional electric motor cannot maintain sufficient strength against the centrifugal force, and the large-sized rotation It was not applicable to the machine.

  The present invention has been made to solve such a problem, and devised an engagement structure between a split iron core and a rotary shaft constituting the rotor core, thereby increasing the engagement strength between the split iron core and the rotary shaft. It is an object of the present invention to provide a rotating machine that can maintain sufficient strength against centrifugal force and that can easily assemble / disassemble a split iron core on a rotating shaft, and a method for manufacturing the same.

  The rotating machine according to the present invention includes a rotating shaft, a rotor core having a base portion fixed to the rotating shaft, and a plurality of teeth portions extending radially from the base portion at equal angular intervals, and the plurality of teeth. A rotor having a field winding wound around each of the portions, and a plurality of slots that are open in the circumferential direction in the circumferential direction, and are arranged so as to surround the rotor core A stator having a stator core and a stator winding wound around the stator core. The rotating shaft includes a cylindrical shaft portion, and a wedge-shaped first portion that extends radially outward from the shaft portion, extends in the circumferential direction, and has a circumferential width gradually narrowing radially inward. The rotor core is composed of a plurality of split iron cores including a tooth portion and a fastening portion in which the base portion is divided in the circumferential direction for each tooth portion. It is configured. The inner diameter side of the fastening portion of one divided core among the plurality of divided cores is manufactured to have an outer shape that matches the inner shape of the first space, and the inner diameter of the fastening portion of the divided core that remains in the plurality of divided cores. An engagement groove portion that is made to have an outer shape smaller than the inner shape shape of the first space and is fitted into the engagement protrusion in an outer fitting state is formed in each of the remaining fastening cores in the circumferential direction. It is installed. The remaining split iron core is restricted from moving in the axial direction and the radial direction and moves in the circumferential direction so that the engaging groove is fitted into the engaging protrusion and is pressed against the outer peripheral surface of the shaft. The one split iron core is disposed adjacent to the circumferential direction in a state, the movement in the radial direction and the circumferential direction is restricted, and moves in the axial direction so that the inner diameter side of the fastening portion is disposed in the first space. Between the split cores positioned at both ends in the circumferential direction of the remaining split core. It is arranged.

  According to this invention, one split iron core fits the inner diameter side of the fastening portion into the first space, and the fitting recess formed in the fastening portion of the split core positioned at both circumferential ends of the remaining split core. And the movement in the radial direction and the circumferential direction is restricted, and the remaining divided iron cores are disposed so as to be movable in the axial direction between the divided iron cores located at both ends in the circumferential direction. Therefore, the split iron core assembled to the rotating shaft cannot be pulled out radially outward, and a sufficient coupling strength to withstand an increase in centrifugal force accompanying an increase in the diameter of the rotor can be obtained.

Further, since the inner diameter side of the fastening portion of the remaining split iron core is smaller than the first space, the engaging groove portion can be fitted to the engaging protrusion by moving the remaining split iron core from the first space in the circumferential direction. it can. And only by moving one division | segmentation iron core to an axial direction, it can assemble | attach between the division | segmentation cores of the circumferential direction both ends of a division | segmentation core, and a rotor can be assembled easily.
In addition, since one split iron core is movable in the axial direction, by pulling out one split iron core in the axial direction, the remaining split iron core can be moved in the circumferential direction, and the rotor can be easily disassembled. it can.

Embodiment 1 FIG.
1 is a front view of a rotating machine according to Embodiment 1 of the present invention as viewed from one axial direction. 2A and 2B are diagrams for explaining a configuration of a rotating shaft in the rotor of the rotating machine according to the first embodiment of the present invention, in which FIG. 2A is a cross-sectional view and FIG. 2B is a front view. . 3A and 3B are diagrams for explaining the configuration of the first teeth in the rotor of the rotating machine according to the first embodiment of the present invention. FIG. 3A is a front view, and FIG. 3B is a side view. is there. 4A and 4B are diagrams for explaining the configuration of the second teeth in the rotor of the rotating machine according to the first embodiment of the present invention. FIG. 4A is a front view, and FIG. 4B is a side view. is there. FIGS. 5A and 5B are diagrams for explaining the configuration of the third teeth in the rotor of the rotating machine according to the first embodiment of the present invention. FIG. 5A is a front view, and FIG. 5B is a side view. is there. In FIG. 1, the extension portions from the slots of the stator winding and the field winding are omitted.

  In FIG. 1, the rotor 1 includes a rotating shaft 2, a base portion 11 that is coaxially fixed to the rotating shaft 2, and teeth portions 23, 30, and 38 that extend radially from the base portion 11 at equal angular intervals. And a field winding 12 produced by winding a magnet wire 13 as an element wire in which a conductor having a circular cross section is covered with an insulating film around the teeth portions 23, 30, and 38 of the rotor core 10. And comprising. The rotor core 10 is formed by dividing the base portion 11 at equal angular intervals for each of the tooth portions 23, 30, 38, for example, nine first divided cores 21, two second divided cores 28, and one The third split iron core 36 is used. The stator 40 includes a cylindrical stator core 41 in which, for example, nine slots 42 opened on the inner diameter side are arranged at equal angular pitches in the circumferential direction, and a stator winding 43 wound around the stator core 41. Have.

  In the rotating machine 100, the rotor 1 is rotatably supported in a case (not shown) with the rotating shaft 2 being supported, and the stator 40 surrounds the outer periphery of the rotor 1 with a predetermined gap. It is configured to be held in the case.

Next, the configuration of the rotor 1 will be specifically described.
As shown in FIG. 2, the rotary shaft 2 is formed in a stepped columnar shape in which the large-diameter second shaft portion 4 is coaxially and integrally formed in the axial central portion of the small-diameter first shaft portion 3. The circumferential direction in which the engagement protrusion 5 is integrally extended radially outward from the axial central portion of the second shaft portion 4 and is extended in the circumferential direction, and the first space 8 is drilled in the axial direction. It is made in a C shape. The engaging protrusion 5 has a protrusion 6 having a predetermined axial length, an axial length shorter than the protrusion 6, and the axial center of the second shaft 4 and the axial center of the protrusion 6. The cross section in the plane containing the axis part of the 1st axial part 3, ie, the rotating shaft 2, is formed in T shape. The first space 8 is formed between the C-shaped opposing wall surfaces of the engagement protrusion 5 and is configured in a wedge shape in which the circumferential width gradually narrows radially inward. The first space 8 has a larger width in the circumferential direction than a wedge-shaped space in which the engagement protrusion 5 is equally divided into 12 in the circumferential direction around the axis of the rotating shaft 2. The second space 9 has an elliptical cross section with a circumferential width wider than the radially inner peripheral end of the first space 8, and the first and second shaft portions are connected to the radially inner end of the first space 8. 3 and 4 are recessed and extend in the axial direction.

  The 1st division | segmentation iron core 21 is produced in the shape which divided the rotor core 10 into 12 equally in the circumferential direction. That is, as shown in FIG. 3, the first split iron core 21 has a wedge shape in which the circumferential width is narrowed radially inward, and the inner diameter side end surface is aligned with the outer circumferential surface of the second shaft portion 4 of the rotating shaft 2. A fastening portion 22 formed in a concave curved surface and pressed against the outer peripheral surface of the second shaft portion 4; a teeth portion 23 extending radially outward from the fastening portion 22 and wound with the field winding 12; It is comprised from the collar part 24 protruded by the circumferential direction from the front-end | tip of the teeth part 23 on both sides. Then, an engagement groove portion 25 that is fitted to the engagement protrusion 5 in an externally fitted state is formed in the circumferential direction in the central portion in the axial direction of the fastening portion 22. The engagement groove portion 25 is formed in an inner shape that substantially matches the outer shape of the engagement protrusion 5 in a plane including the axis of the rotation shaft 2.

  As shown in FIG. 4, the second split iron core 28 has a wedge shape with a circumferential width narrowing radially inward, and an inner diameter side end surface is a recess that matches the outer circumferential surface of the second shaft portion 4 of the rotary shaft 2. A fastening portion 29 that is formed in a curved surface and is pressed against the outer peripheral surface of the second shaft portion 4, a tooth portion 30 that extends radially outward from the fastening portion 29 and is wound with the field winding 12, and a tooth portion It is comprised from the collar part 31 protrudingly provided by the both sides in the circumferential direction from the front-end | tip of 30. As shown in FIG. Then, an engagement groove portion 32 that is fitted to the engagement protrusion 5 in an externally fitted state is formed in the circumferential direction in the central portion of the fastening portion 29 in the axial direction. The engagement groove 32 is formed in an inner shape that substantially matches the outer shape of the engagement protrusion 5 in a plane including the axis of the rotation shaft 2. On the inner diameter side of the side surface on the circumferential side of the fastening portion 29, a fitting recess 33 is provided in accordance with the bulging portion 37a on the inner diameter side of the circumferential side portion of the fastening portion 37 of the third split iron core 36 to be described later. Has been.

  As shown in FIG. 5, the third divided core 36 has a wedge shape in which the circumferential width becomes narrower inward in the radial direction, and is fastened with a fastening portion 37 and a fastening portion 37 sandwiched between fastening portions 29 of the second divided core 28. The teeth portion 38 extends radially outward from the teeth portion 38, and the field winding 12 is wound around, and the flange portion 39 protrudes on both sides in the circumferential direction from the tip of the tooth portion 38. Then, the inner diameter side of the fastening portion 37 corresponding to the engagement protrusion 5 bulges in the circumferential direction, and the bulging portion 37a having an outer shape that substantially matches the inner shape of the first space 8 in the plane including the axis of the rotating shaft 2. Is formed. Further, a fitting portion 37 b having an outer shape substantially coinciding with the inner shape of the second space 9 is integrally projected at the tip of the fastening portion 37.

Here, the fastening portion 29 has the same shape as the fastening portion 22 except for the fitting recess 33, and the fastening portion 37 has the same shape as the fastening portion 22 except for the bulging portion 37a and the fitting portion 37b. The inner diameter side of the fastening part 37 has the same cross-sectional shape as the first space 8 and is produced by dividing the base part 11 of the rotor core 10 into 12 parts in the circumferential direction by the amount of the bulging part 37a. The circumferential width is wider than the fastening portion 22 of the first split iron core 21. The bulging portion 37 a on the inner diameter side of the fastening portion 37 is fitted into the fitting recess 33 of the fastening portion 29 of the second split iron core 28.
Further, the first to third divided iron cores 21, 28, and 36 may be manufactured by stacking and integrating electromagnetic steel plates, for example, or may be manufactured by a cold forging method using low carbon steel such as S10C.

  Then, the nine first divided iron cores 21 wind the field winding 12 around the tooth portion 23, bring the inner diameter side end face of the fastening portion 22 into contact with the second shaft portion 4, and the circumferential direction of the fastening portion 22 The side surfaces are brought into contact with each other, and the engaging groove portions 25 are fitted into the engaging protrusions 5 so as to be arranged adjacent to each other in the circumferential direction. Two second split iron cores 28 wind the field winding 12 around the tooth portion 30, bring the inner diameter side end surface of the fastening portion 29 into contact with the second shaft portion 4, and the circumferential side surface of the fastening portion 29. It is arranged adjacent to the first divided iron cores 21 on both sides in the circumferential direction by contacting the circumferential side surface of the fastening portion 22 and engaging the engaging groove 32 with the engaging projection 5. Further, the third split iron core 36 winds the field winding 12 around the teeth portion 38, and causes the bulging portions 37 a on both sides in the circumferential direction of the fastening portion 37 to contact the fitting recesses 33 of the fastening portion 29. The rotor 1 is assembled by fitting into the first space 8 and inserting the fitting portion 37b into the second space 9, and being arranged between the second divided cores 28.

  In the rotor 1 configured as described above, the field winding 12 is wound around the tooth portions 23, 30, and 38 of the first to third divided iron cores 21, 28, and 36 before assembly. The space factor that is the ratio of the field winding 12 to the space (slot) formed between the tooth portions 23, 30, and 38 of the third divided iron cores 21, 28, and 36 can be increased. The resistance of 12 can be reduced. Therefore, the rotating machine 100 incorporating the rotor 1 can increase the field current value under the condition of a constant power supply voltage, the magnetomotive force of the rotor 1 can be increased, and high output and high torque can be obtained. .

  The first and second divided iron cores 21 and 28 are arranged in the circumferential direction with the engagement groove portions 25 and 32 fitted into the engagement protrusions 5 having a T-shaped cross section and the fastening portions 22 and 29 abutting each other. Yes. Furthermore, the third split iron core 36 fits the bulging portion 37a of the fastening portion 37 into the fitting recess 33 of the fastening portion 29 facing in the circumferential direction, and the fitting portion 37b is fitted into the second space 9 to make the second. It is arranged between the two-divided iron cores 28. Therefore, the first to third divided cores 21, 28, and 36 cannot be drawn outward in the radial direction, and a rotor core structure that can withstand an increase in centrifugal force accompanying an increase in the diameter of the rotor 1 can be realized. .

Next, assembly of the rotor 1 configured as described above will be described with reference to FIGS. 6 and 7.
First, the fastening portion 22 of the first split iron core 21 around which the field winding 12 is wound is inserted into the first space 8 of the rotating shaft 2. Then, while the engagement groove portion 25 of the first split iron core 21 is fitted into the engagement protrusion 5 in an externally fitted state, the engagement protrusion 5 as shown by the arrows in FIGS. 6A and 7A. The first split iron core 21 is moved in the circumferential direction with reference to. In this manner, the nine first divided iron cores 21 are sequentially attached to the rotary shaft 2. FIG. 6B shows a state in which the three first divided iron cores 21 are attached to the rotating shaft 2.

  Next, the fastening portion 29 of one second split iron core 28 around which the field winding 12 is wound is inserted into the first space 8 of the rotating shaft 2. Then, the second split iron core 28 is moved to one side in the circumferential direction using the engagement protrusion 5 as a guide while fitting the engagement groove 32 of the second split iron core 28 into the engagement protrusion 5 in an externally fitted state. Next, the fastening portion 29 of the remaining one second divided iron core 28 around which the field winding 12 is wound is inserted into the first space 8 of the rotating shaft 2. Then, the second split iron core 28 is moved to the other side in the circumferential direction using the engagement protrusion 5 as a guide while fitting the engagement groove portion 32 of the second split iron core 28 into the engagement protrusion 5 in an outer fitting state. As a result, as shown in FIG. 6C, nine first divided cores 21 extend radially from the axial center and are arranged adjacent to each other in the circumferential direction, and further two second divided cores. 28 are arranged adjacent to both sides in the circumferential direction of the nine first divided iron cores 21.

  Next, as shown in FIG. 7B, the third divided core 36 around which the field winding 12 is wound is translated in the axial direction of the rotary shaft 2, and the fastening portion 37 is moved to the first space. 8 and the bulging portion 37a is fitted into the fitting recess 33 of the fastening portion 29, and at the same time, the fitting portion 37b is fitted into the second space 9, and the rotor 1 is assembled. At this time, the bulging portion 37a of the fastening portion 37 is press-fitted into the first space 8 and the fitting concave portion 33, and the fitting portion 37b is press-fitted into the second space 9, so that the circumferential direction and the radial direction of the third divided core 36 are obtained. At the same time, the movement of the first and second split cores 21 and 28 in the circumferential direction is prevented. Further, the engagement between the engagement groove portions 25 and 32 and the engagement protrusion 5 restricts the movement of the first and second divided iron cores 21 and 28 in the radial direction and the axial direction. Further, the axial force of the third divided core 36 is adjusted by the pressure input to the first space 8 and the fitting recess 33 of the bulging portion 37a and the pressure input to the second space 9 of the fitting portion 37b. The

  Further, in order to disassemble the rotor 1, first, the first force 8 is applied to the first space 8 and the fitting recess 33 of the bulging portion 37a and the drawing force is greater than the pressure input to the second space 9 of the fitting portion 37b. The three-piece iron core 36 is extracted from the fitting recess 33 and the first and second spaces 8 and 9 in the axial direction. Next, the second and first divided iron cores 28 and 21 are moved to the first space 8 in the circumferential direction, respectively, and are taken out from the first space 8. Thereby, the 1st thru | or 3rd division | segmentation iron cores 21, 28, and 36 can be disassembled easily.

  Here, from the viewpoint of increasing rigidity by connecting and integrating the first to third divided iron cores 21, 28, 36 and the rotor 1, the inner shape of the engaging groove portions 25, 32 is more than the outer shape of the engaging protrusion 5. It is preferable that the outer shape of the bulging portion 37a and the fitting portion 37b is made slightly larger than the inner shape of the fitting concave portion 33 and the first and second spaces 8 and 9.

  Therefore, in the process of assembling the first and second divided iron cores 21 and 28 to the rotary shaft 2, the first and second divided iron cores 21 and 28 are heated to a temperature that does not deteriorate the insulating film of the magnet wire 13 and rotated. It is preferable to assemble to the shaft 2. By this shrink fitting, the engagement grooves 25 and 32 having a slightly smaller inner shape are expanded and can be easily fitted to the engagement protrusion 5. And when the temperature of the 1st and 2nd division | segmentation iron cores 21 and 28 returns to normal temperature, the internal-diameter shape of the engagement groove parts 25 and 32 will shrink | contract to an original shape, and it will adhere firmly to the engagement protrusion 5, and rigidity will be sufficient. Increases the noise and vibration.

  In the step of assembling the third divided iron core 36 to the rotating shaft 2, it is preferable to cool the third divided iron core 36 and to assemble it to the rotating shaft 2. By this cold fitting, the bulging portion 37a and the fitting portion 37b having a slightly larger outer shape are contracted, and the fitting can be easily fitted into the fitting recess 33 and the first and second spaces 8 and 9. And when the temperature of the 3rd division | segmentation iron core 36 returns to normal temperature, the external shape of the bulging part 37a and the insertion part 37b will expand | swell to the original state, and it will be in the fitting recessed part 33 and the 1st and 2nd space 8,9. It is firmly fixed, increases its rigidity, and suppresses the generation of noise and vibration.

  Next, the engagement strength in the engagement structure between the split iron core and the rotating shaft according to the present invention will be described with reference to FIG.

FIG. 8 is a cross-sectional view for explaining the calculation parameters of the stress applied to the engaging projection of the rotating shaft with which the split iron core is fitted in the present invention.
In FIG. 8, the rotating shaft 110 has a columnar shaft portion 111 and an engagement protrusion 112 formed integrally on the outer peripheral wall surface of the shaft portion 111. The engagement protrusion 112 includes a ring-shaped base 113 having an axial width la projecting from the outer peripheral wall surface of the shaft 111, and an axial width L integrally formed at the tip of the base 113 and having a radial thickness h. And a section in a plane including the axial center of the shaft portion 111 is T-shaped. However, the axial width L of the protrusion 114 is wider than the axial width la of the base 113.

Here, the stress σ applied to the engaging protrusion 112 of the rotating shaft 110 is expressed by Expression (1), where w is an evenly distributed load.
_{σ = w × (L-l} a) 2 × 6 / (8 × h 2) ··· Equation (1)

  From Equation (1), the stress σ decreases as the radial thickness h of the protrusion 114 increases or as the axial extension length (L-la) of the protrusion 114 from the base 113 decreases. I can say that.

  In the conventional electric motor, the rotor core is divided in the circumferential direction for each tooth, and the engaging convex portion and the fitting concave portion are extended in the axial direction of the rotating shaft to each tooth. In addition, the circumferential width of the projecting piece of the fitting recess is narrow, and the axial length cannot be shortened in order to obtain a predetermined strength. This is because when the uniformly distributed load w increases with an increase in centrifugal force, the axial lengths of the projecting pieces of the engaging convex portion and the fitting concave portion are shortened to reduce the engagement convex portion and the fitting concave portion. This means that the stress applied to the projecting pieces cannot be reduced, and excessive stress is applied to the projecting pieces of the engaging convex part and the fitting concave part. As a result, in the conventional rotor structure of an electric motor, an engagement strength sufficient to withstand a large centrifugal force applied to a large-diameter rotor cannot be obtained.

  In the present invention, since the engagement protrusion 112 extends in the circumferential direction, a predetermined strength can be obtained even if the axial extension length (L-la) of the protrusion 114 from the base 113 is reduced. . In addition, it is possible to increase the radial thickness h of the protrusion 114 due to the structure. Therefore, when the evenly distributed load w increases as the centrifugal force increases, the axial extension length (L-la) of the protrusion 114 from the base 113 is reduced, or the diameter of the protrusion 114 is reduced. By increasing the directional thickness h, the stress applied to the protrusion 114 can be reduced, and it is possible to avoid applying excessive stress to the protrusion 114. As a result, in the present invention, an engagement strength sufficient to withstand a large centrifugal force applied to the large-diameter rotor can be obtained.

  In the first embodiment, the pulling force in the radial direction acting on the first to third divided iron cores 21, 28, 36 due to the centrifugal force is mainly the fitting portion between the engagement groove portions 25, 32 and the engagement protrusion 5. It has been received at. Since the fitting portion is configured in a T shape, the protrusion 6 and the base 7 correspond to the protrusion 114 and the base 113 in the model of FIG. Therefore, also in the first embodiment, the centrifugal force is reduced by shortening the axial extension length of the protrusion 6 from the base 7 or increasing the radial thickness of the protrusion 6 from the formula (1). It is possible to obtain a sufficient bonding strength with respect to the above, and it can be applied to a large rotating machine.

  In the first embodiment, it is assumed that one engagement protrusion 5 having a T-shaped cross section is provided on the second shaft portion 4. However, the shape and arrangement of the engagement protrusion 5 are limited to this. It is not something. For example, as shown in FIG. 9, two engaging protrusions 5 having a T-shaped cross section may be provided in two steps so as to be spaced apart from each other in the second shaft portion 4 in the axial direction. In this case, the two engaging groove portions are formed in the fastening portions of the first and second split iron cores while being separated in the axial direction. In addition, as shown in FIG. 10, engagement protrusions having a T-shaped cross section may be provided to protrude from the second shaft portion in two stages in the radial direction. In this case, the two engaging groove portions are overlapped in two stages in the radial direction and drilled in the fastening portions of the first and second teeth.

  In the first embodiment, the engagement protrusion 5 is formed in a T-shaped cross section. However, the cross-sectional shape of the engagement protrusion is not limited to this, and the engagement is fastened. It is only necessary to be able to move the portion in the circumferential direction and to restrict movement in the radial direction and the axial direction. For example, a trapezoidal cross section in which the axial length gradually increases outward in the radial direction may be used. In the case of a trapezoidal engagement protrusion, la in equation (1) corresponds to the length of the top (short side) of the cross-section trapezoid, and L corresponds to the length of the bottom (long side).

In the first embodiment, a field wire is manufactured by winding a magnet wire, in which an insulating layer is formed on the surface of a conductor as a strand, around a tooth portion. After coating the insulating layer on the surface of the insulating layer and winding it around the teeth using a self-bonding wire with a further fusion layer formed on the surface of the insulating layer, the wires are self-fused and integrated. May be. In this case, there is no variation in the strands constituting the field winding, and movement of the field winding due to centrifugal force can be prevented.
Moreover, in the said Embodiment 1, although the rotor core 10 shall be divided into 12 in the circumferential direction, the division | segmentation number of the rotor core 10 is not limited to 12, It divides | segments for every teeth part. It only has to be.

Embodiment 2. FIG.
In the first embodiment, the magnet wire 13 in which a conductor having a circular cross section is covered with an insulating film is used as the element wire. In the second embodiment, as shown in FIG. A magnet wire 14 in which an insulating film is coated on the conductor is used.
Other configurations are the same as those in the first embodiment.

  In the second embodiment, since the magnet wire 13 having a rectangular cross section is used, the magnet wire 14 can be neatly wound around the teeth portions 23, 30 and 38 without any gap. Thereby, the space factor which is the ratio which the field winding 12A occupies with respect to the space (slot) formed between the teeth parts 23, 30, and 38 of the 1st thru | or 3rd division | segmentation iron cores 21, 28, 36 is raised further. Therefore, high output and high torque can be achieved.

Embodiment 3 FIG.
In the third embodiment, as shown in FIG. 12, the permanent magnet 15 is disposed in the first to third divided cores so as not to protrude from the radially outermost peripheral surfaces of the first to third divided cores 21, 28, and 36. It adheres to the outermost circumferential surface in the radial direction of 21, 28, 36. The permanent magnets 15 adjacent in the circumferential direction are magnetized so as to have different polarities.
Other configurations are the same as those in the first embodiment.

In the third embodiment, since the magnetic flux of the permanent magnet 15 is added to the magnetic flux generated by the field winding 12, the magnetomotive force of the rotor is increased, so that high output and high torque can be achieved.
Here, as the permanent magnet 15, for example, a rare earth magnet made of a material containing a rare earth magnet element such as neodymium or samarium is used.

Embodiment 4 FIG.
In the fourth embodiment, as shown in FIG. 13, the shim mounting grooves 16 are recessed in the circumferential side surfaces of the fastening portions 22, 29, 37 of the first to third divided iron cores 21, 28, 36, and rotated. When assembling the child, the shim 17 is mounted in the shim mounting groove 16.
Other configurations are the same as those in the first embodiment.

  In the fourth embodiment, since the shim 17 is interposed between the fastening portions 22, 29, and 37, the first to third divided cores 21, 28, and 36 are processed by adjusting the thickness of the shim 17. It is possible to eliminate an imbalance in the arrangement pitch of the first to third divided iron cores 21, 28, and 36 due to variations in accuracy. Thereby, generation | occurrence | production of the noise and vibration by the imbalance of the arrangement pitch of the 1st thru | or 3rd division | segmentation iron cores 21,28,36 can be suppressed.

  Here, the shim 17 does not necessarily need to be interposed between the adjacent fastening portions 22, 29, and 37, and the shim 17 is considered in consideration of variations in processing accuracy of the first to third divided iron cores 21, 28, and 36. The number of interventions may be adjusted. As a result, the number of intervening shims 17 is reduced, and the cost can be reduced. Moreover, it is preferable to interpose the shim 17 at an equiangular pitch from the viewpoint of eliminating the imbalance in the arrangement pitch of the first to third divided cores 21, 28, and 36. Thereby, generation | occurrence | production of a noise and a vibration is suppressed.

Further, from the viewpoint of reducing magnetic noise between the stator and the stator, the number of shims 17 is a factor of the total number of teeth portions of the rotor core and not a factor of the total number of slots of the stator core. It is preferable to do. For example, when the rotor core has twelve teeth portions and the stator core has nine slots, the number of shims 17 interposed is 2, 4, 6, 12.
Here, a description will be given of setting the number of shim interventions to a number that is not a factor of the slot number.
Considering the balance of the rotor, it is necessary to place shims at regular intervals with a factor (excluding 1) of the total number of rotating cores. Torque pulsation, which is a cause of magnetic noise, generally occurs at the least common multiple of the number of slots and the number of poles. From the stator side, the number of poles can be said to be the number of magnetic flux changes generated by the rotor. In addition, when a shim is inserted in the same manner, there are places where the widths of the rotor core and the adjacent rotor core are different, so that a change in magnetic flux occurs in the circumferential direction of the rotor. If a number that is a factor of the number of slots is selected as the number of shim interposed, it means that the least common multiple with the number of slots is reduced. Therefore, it is desirable that the number of shim interventions is not a factor of the number of slots.

Embodiment 5 FIG.
In the fifth embodiment, as shown in FIG. 14, the gap d between the flange portions 24, 31, 39 adjacent in the circumferential direction is narrower than the wire diameter of the magnet wire 13 constituting the field winding 12. In addition, the first to third divided iron cores 21, 28, and 36 are manufactured.
Other configurations are the same as those in the first embodiment.

  According to the fifth embodiment, since the gap d between the flanges 24, 31, 39 is narrower than the wire diameter of the magnet wire 13 constituting the field winding 12, the centrifugal force acts on the field winding 12. However, the field winding 12 can be prevented from popping out. Thereby, the holding mechanism of the field winding 12 becomes unnecessary, and the cost can be reduced accordingly.

It is the front view which looked at the rotary machine which concerns on Embodiment 1 of this invention from the axial direction one side. It is a figure explaining the structure of the rotating shaft in the rotor of the rotary machine which concerns on Embodiment 1 of this invention. It is a figure explaining the structure of the 1st tooth | gear in the rotor of the rotary machine which concerns on Embodiment 1 of this invention. It is a figure explaining the structure of the 2nd teeth in the rotor of the rotary machine which concerns on Embodiment 1 of this invention. It is a figure explaining the structure of the 3rd teeth in the rotor of the rotary machine which concerns on Embodiment 1 of this invention. It is a front view explaining the assembly process of the rotor of the rotary machine which concerns on Embodiment 1 of this invention. It is sectional drawing explaining the assembly process of the rotor of the rotary machine which concerns on Embodiment 1 of this invention. It is sectional drawing explaining the calculation parameter of the stress concerning the engaging protrusion of the rotating shaft which the division | segmentation iron core fits in this invention. It is sectional drawing which shows the aspect of the rotating shaft applied to the rotor of the rotary machine which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the other embodiment of the rotating shaft applied to the rotor of the rotary machine which concerns on Embodiment 1 of this invention. It is a front view which shows the principal part of the rotor of the rotary machine which concerns on Embodiment 2 of this invention. It is a front view which shows the principal part of the rotor of the rotary machine which concerns on Embodiment 3 of this invention. It is a front view which shows the principal part of the rotor of the rotary machine which concerns on Embodiment 4 of this invention. It is a front view which shows the principal part of the rotor of the rotary machine which concerns on Embodiment 5 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Rotor, 2 Rotating shaft, 3 1st axis part, 4 2nd axis part, 5 Engagement protrusion, 8 1st space, 9 2nd space, 10 Rotor core, 11 Base, 12, 12A Field winding , 13, 14 Magnet wire (elementary wire), 15 Permanent magnet, 17 Shim, 21 1st split iron core, 22 Fastening part, 23 Teeth part, 24 collar part, 25 Engaging groove part, 28 2nd split iron core, 29 Fastening part , 30 teeth part, 31 collar part, 32 engagement groove part, 33 fitting recess part, 36 third divided core, 37 fastening part, 37a bulging part, 37b fitting part, 38 teeth part, 39 collar part, 40 stator, 41 Stator core, 42 slots, 43 stator windings.

Claims (14)

A rotor core having a rotating shaft, a base fixed to the rotating shaft, and a plurality of teeth extending radially from the base at equal angular intervals, and wound around each of the plurality of teeth. A rotor having a magnetic field winding;
A plurality of slots that are open on the inner diameter side in the circumferential direction, a cylindrical stator core disposed so as to surround the rotor core, a stator winding wound around the stator core, A rotating machine comprising a stator having
The rotating shaft includes a cylindrical shaft portion, and a wedge-shaped first portion that extends radially outward from the shaft portion, extends in the circumferential direction, and has a circumferential width gradually narrowing radially inward. The space is composed of engaging protrusions drilled in the axial direction,
The rotor core is composed of a plurality of split cores composed of fastening portions obtained by dividing the teeth portion and the base portion in the circumferential direction for each tooth portion,
The inner diameter side of the fastening portion of one of the plurality of divided iron cores is produced in an outer shape that matches the inner shape of the first space,
The inner diameter side of the fastening portion of the split core where the plurality of split cores remain is produced in an outer shape smaller than the inner shape of the first space,
Engaging groove portions that are fitted to the engaging protrusions in an outer fitting state are formed in the circumferential direction in the respective fastening portions of the remaining split iron cores,
The remaining split iron core is restricted in movement in the axial direction and the radial direction and moves in the circumferential direction, and the engagement groove portion is fitted into the engagement protrusion, and is pressed against the outer peripheral surface of the shaft portion. Arranged adjacent to the circumferential direction,
The one split iron core is restricted from moving in the radial direction and the circumferential direction and moves in the axial direction so that the inner diameter side of the fastening portion is fitted into the first space, and the periphery of the remaining split iron core Rotating machine characterized by being fitted between fitting recesses formed in fastening portions of split cores located at both ends in the direction and disposed between split cores located at both ends in the circumferential direction of the remaining split core . A second space having a circumferential width wider than a circumferential width of a radially inner end of the first space is extended in the axial direction to the shaft portion so as to be coupled to a radially inner end of the first space;
2. The rotating machine according to claim 1, wherein an insertion protrusion that is fitted in the second space in an internally fitted state is integrally protruded from a radially inner end of a fastening portion of the one divided core.   The rotating machine according to claim 1 or 2, wherein the engaging protrusion and the engaging groove are formed in multiple stages in the axial direction.   The rotating machine according to claim 1 or 2, wherein the engagement protrusion and the engagement groove are formed in multiple stages in the radial direction.   The rotating machine according to any one of claims 1 to 4, wherein the element wire of the field winding is a self-bonding winding.   6. The rotating machine according to claim 1, wherein the element wire of the field winding is a winding having a rectangular cross section.   The circumferential gap of the radial outer peripheral part of the tooth part adjacent to the circumferential direction of the rotor core is narrower than the wire diameter of the element wire of the field winding. A rotating machine according to claim 1.   The rotating machine according to any one of claims 1 to 7, wherein a permanent magnet is attached to each of the radially outer peripheral surfaces of the plurality of divided iron cores.   The rotating machine according to any one of claims 1 to 8, wherein a shim is interposed in at least one of the fastening portions adjacent in the circumferential direction.   10. The rotating machine according to claim 9, wherein the number between the fastening portions adjacent to each other in the circumferential direction in which the shim is interposed is a factor of the total number of the tooth portions and is not a factor of the total number of the slots. .   11. The rotating machine according to claim 9, wherein the shims are interposed at an equiangular pitch. In the manufacturing method of the rotating machine according to any one of claims 1 to 11,
The inner diameter side of the fastening portion of each of the remaining split cores is positioned in the first space of the rotating shaft, and then moved in the circumferential direction while fitting the engaging groove with the engaging protrusion. A first step of assembling the rotary shaft;
The fastening portion of the one split iron core is moved in the axial direction, and is fitted into the fitting recesses of the fastening portions of the split cores at both ends in the circumferential direction of the first space and the remaining split cores. And a second step of assembling the rotating machine.   13. The method of manufacturing a rotating machine according to claim 12, wherein in the first step, the remaining divided cores are assembled to the rotating shaft in a heated state.   13. The method of manufacturing a rotating machine according to claim 12, wherein in the second step, the one split iron core is assembled to the rotating shaft in a cooled state.

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