JP6824032B2 - How to assemble a reluctance rotary electric machine and a reluctance rotary electric machine - Google Patents

Description

Embodiments of the present invention relate to a method of assembling a reluctance rotary electric machine and a reluctance rotary electric machine.

The reluctance motor includes a rotor and a stator. The rotor includes a shaft that is rotatably supported by a shaft and extends in the axial direction at the center of the rotation shaft, and a rotor core that is externally fitted and fixed to the shaft. The stator is arranged on the outer periphery of the rotor core at a distance from the rotor core, and is wound around a stator core having a plurality of teeth arranged at intervals in the circumferential direction and a plurality of teeth, respectively. It is equipped with a multi-pole multi-phase armature winding.

The rotor core is formed with a plurality of layers of cavities having a convex shape in the radial direction per pole. By forming the cavity portion in this way, a direction in which the magnetic flux easily flows and a direction in which the magnetic flux does not easily flow are formed in the rotor core. Then, the reluctance motor uses the reluctance torque generated by the cavity to rotate the shaft.

By the way, at the time of starting the reluctance rotary electric machine, it is necessary to detect the relative position between the stator core and the rotor core and supply power to a predetermined armature winding based on this relative position. For this reason, an inverter is required to start the reluctance motor, which may increase the cost of the reluctance motor.
Therefore, a so-called self-starting type reluctance motor that generates an induced torque has been proposed so that the reluctance motor can be started without using an inverter.

In the self-starting type reluctance rotary electric machine, a non-magnetic conductor is inserted in the cavity. The conductor protrudes from both ends in the axial direction of the rotor core, and both ends are joined to an annular short-circuit ring. Under such a configuration, when a three-phase alternating current is supplied to the armature winding of the stator, a magnetic flux is formed in a predetermined tooth. At this time, an induced current is generated in the conductor bar of the rotor core in an asynchronous state until the rotor in the stopped state rotates in synchronization with the rotational movement of the magnetic flux on the stator side. That is, the conductor bar functions as a secondary coil and generates a starting torque for rotating the rotor with the stator.

Here, the work of inserting the conductor into the cavity and the work of positioning the conductor in the cavity are often performed by using a dedicated tool or jig, and the workability is high. Further, if the conductor is not positioned accurately, it becomes difficult to perform the joining work between the conductor and the short-circuit ring, which may deteriorate the assembly workability of the rotor.

Japanese Unexamined Patent Publication No. 8-182275 Japanese Unexamined Patent Publication No. 2003-274621

An object to be solved by the present invention is to provide a reluctance rotary electric machine capable of improving the assembly workability of the rotor.

Method of assembling a reluctance rotating electrical machine embodiment, a shaft, a rotor core, a bridge, a plurality of conductor bars, Chi lifting circuiting ring, and two end plates, and corresponds to the conductor bars of the end plates This is a method of assembling a reluctance rotary electric machine in which an insertion hole through which a conductor bar can be inserted is formed at a position. The shaft rotates about the axis of rotation. The rotor core is fixed to the shaft, and a plurality of layers of cavities formed so as to be convex inward in the radial direction per pole are formed. The bridge is formed between both ends of the plurality of layers of the cavity in the longitudinal direction and the outer peripheral surface of the rotor core when viewed from the direction of the rotation axis. The plurality of conductor bars are arranged in the cavity of the plurality of layers at regular intervals from the corresponding bridges , and both ends extend so as to project from both ends in the rotation axis direction of the rotor core, and a cross section orthogonal to the rotation axis. The shape is rectangular. Short-circuit rings are provided at both ends of the plurality of conductor bars in the direction of the rotation axis, and connect the plurality of conductor bars. Further, the method of assembling the reluctance rotary electric machine includes a subunit forming step, an end plate arranging step, a conductor bar inserting step, and a short-circuit ring fixing step. In the subunit forming step, one end of the conductor bar is fixed to the short-circuit ring to form the subunit. In the end plate arrangement step, end plates are arranged on both sides of the rotor core in the direction of the rotation axis. In the conductor bar insertion step, after the subunit forming step and the end plate arranging step , the other end of the conductor bar is inserted into the cavity from one side in the rotation axis direction of the rotor core, and the other end in the rotation axis direction of the rotor core. The other end of the conductor bar is projected. In the short-circuit ring fixing step, the short-circuit ring is fixed to the other end of the conductor bar after the conductor bar insertion step.

Partial sectional perspective view which shows the reluctance rotary electric machine of embodiment. FIG. 5 is a cross-sectional view orthogonal to the axial direction showing the rotor core of the embodiment. The perspective view which shows the state which removed the end plate and the short-circuit ring of the rotor of an embodiment. The perspective view which shows the state which attached the end plate to the rotor core of an embodiment. The exploded perspective view which shows the rotor of an embodiment. The perspective view which shows the rotor in the 2nd modification of embodiment. An exploded perspective view showing a rotor in a third modification of the embodiment.

Hereinafter, the reluctance rotary electric machine of the embodiment will be described with reference to the drawings.

FIG. 1 is a partial cross-sectional perspective view showing a reluctance rotary electric machine (hereinafter, simply referred to as a rotary electric machine) 1.
As shown in the figure, the rotary electric machine 1 includes a housing 2, a stator 3 fixed in the housing 2, and a rotor 4 rotatably supported in the housing 2 around the rotation axis O. It has. In the following description, the direction parallel to the rotation axis O is simply referred to as the axial direction, the direction rotating around the rotation axis O is simply referred to as the circumferential direction, and the radial direction orthogonal to the rotation axis O is simply referred to as the radial direction. ..

The housing 2 includes a substantially cylindrical frame 5 and bearing brackets 6 and 7 that close the openings 5a and 5b at both ends of the frame 5 in the axial direction. Each of the bearing brackets 6 and 7 is formed in a substantially disk shape. Bearings 8 and 9 for rotatably supporting the rotor 4 are provided at substantially the center of each of the bearing brackets 6 and 7 in the radial direction.

The stator 3 has a substantially cylindrical stator core 10 whose central axis is located coaxially with the rotation axis O. The outer peripheral surface of the stator core 10 is fixed to the inner peripheral surface of the frame 5 by, for example, press fitting. The stator core 10 can be formed by laminating a plurality of electromagnetic steel sheets or by pressure-molding soft magnetic powder.
On the inner peripheral surface of the stator core 10, a plurality of teeth 11 projecting toward the rotation axis O and arranged at equal intervals in the circumferential direction are integrally formed. Although the specific shape of the teeth 11 is not particularly shown, the teeth 11 are formed to have a substantially rectangular cross section. A slot (not shown) is formed between the adjacent teeth 11. An armature winding 13 is wound around each tooth 11 via these slots.

The rotor 4 is arranged radially inside the stator core 10. The rotor 4 includes a shaft 14 that rotates around the rotation axis O, a substantially cylindrical rotor core 15 that is externally fitted and fixed to the shaft 14, a plurality of conductor bars 41 provided in the rotor core 15. It includes end plates (iron core retainers) 42 and short-circuit rings 45 arranged on both sides of the rotor core 15 in the axial direction.

FIG. 2 is a cross-sectional view showing the rotor core 15 orthogonal to the axial direction.
As shown in FIGS. 1 and 2, the rotor core 15 can be formed by laminating a plurality of electromagnetic steel sheets or by pressure-molding soft magnetic powder. The outer diameter of the rotor core 15 is set so that a predetermined air gap G is formed between the rotor core 15 and the teeth 11 facing each other in the radial direction. Further, a through hole 16 penetrating in the axial direction is formed in the radial center of the rotor core 15. The shaft 14 is press-fitted or shrink-fitted into the through hole 16, and the shaft 14 and the rotor core 15 rotate integrally.

Further, the rotor core 15 has four layers of cavities (flux barriers) 21, 22, 23, 24 (first cavity 21, second cavity 22, respectively, in the circumferential angle region of 1/4 circumference, respectively. The third cavity portion 23 and the fourth cavity portion 24) are formed side by side in the radial direction. That is, the first cavity 21 is formed at the position closest to the shaft 14 (innermost in the radial direction of the rotor core 15), and the second cavity 22 is sequentially separated from the shaft 14 (outer in the radial direction). , The third cavity portion 23 and the fourth cavity portion 24 are formed side by side. The fourth cavity 24 is arranged at the position farthest from the shaft 14 (outermost in the radial direction).

Further, the hollow portions 21 to 24 are formed so as to follow the flow of magnetic flux formed when the armature winding 13 is energized. That is, each of the cavities 21 to 24 is curved so that the center in the circumferential direction is located most radially inward (so as to have a convex shape toward the inward in the radial direction). As a result, the rotor core 15 is formed with a direction in which the magnetic flux easily flows and a direction in which the magnetic flux does not easily flow. In the following description, the longitudinal direction of each cavity portion 21, 22, 23, 24 when viewed from the axial direction may be simply referred to as the longitudinal direction of the cavity portions 21, 22, 23, 24.

Here, in the present embodiment, the direction in which the magnetic flux easily flows is referred to as the q-axis. Further, the direction along the radial direction that is electrically and magnetically orthogonal to the q-axis is referred to as the d-axis. That is, each of the cavities 21 to 24 has a multi-layer structure in the radial direction along the d-axis.
More specifically, in the rotor core 15, the direction in which the magnetic flux flow is not obstructed by the cavities 21 to 24 is referred to as the q-axis direction. That is, a positive magnetic position (for example, bringing the north pole of the magnet closer) to an arbitrary circumferential angle position of the outer peripheral surface 15a of the rotor core 15 and one pole (in the case of this embodiment, the mechanical angle is 90 degrees). ) The axis of rotation when the largest amount of magnetic flux flows when a negative magnetic position (for example, the S pole of a magnet is brought closer) is given to any other displaced circumferential angle position and the arbitrary position is shifted in the circumferential direction. The direction from O to an arbitrary position is defined as the q-axis. The longitudinal direction of each cavity 21 to 24 is the q-axis.

On the other hand, the direction in which the flow of magnetic flux is obstructed by the cavities 21 to 24, that is, the direction magnetically orthogonal to the q-axis is referred to as the d-axis. In the present embodiment, the d-axis is a direction parallel to the direction in which the two rotor core portions separated into the region near the rotation axis O and the region far from the rotation axis O by the cavities 21 to 24 face each other. Further, when each cavity portion 21 to 24 is formed in multiple layers as in the present embodiment (four layers in the present embodiment), the overlapping direction of the layers is the d-axis. In the present embodiment, the d-axis is not limited to being electrically or magnetically orthogonal to the q-axis, but may intersect with a certain angle width (for example, about 10 degrees in mechanical angle) from the orthogonal angle.

As described above, the rotor core 15 is composed of four poles, and four layers of cavities 21 to 24 are formed per pole (peripheral angle region around 1/4 of the rotor core 15). It will be. And one pole means the region between the q-axis. That is, each of the cavities 21 to 24 is formed to be curved inward in the radial direction so that the d-axis is located most radially inward.

Further, each of the cavities 21 to 24 is curved so that both ends in the longitudinal direction when viewed from the axial direction are located on the outer peripheral portion of the rotor core 15. The cavities 21 to 24 are formed so as to be closer to both ends in the longitudinal direction along the q-axis and closer to the center in the longitudinal direction to be orthogonal to the d-axis.
Further, in the q-axis direction, bridges 26, 27, 28, 29 (first bridge 26, second bridge) are located between both ends in the longitudinal direction of each cavity 21 to 24 and the outer peripheral surface 15a of the rotor core 15, respectively. 27, the third bridge 28, the fourth bridge 29) are formed.

Further, among the cavities 21 to 24, the center bridges 61, 62, 63 (first center bridge 61, respectively) are located at the center in the longitudinal direction of the first cavity 21, the second cavity 22, and the third cavity 23, respectively. The second center bridge 62 and the third center bridge 63) are formed. The center bridges 61, 62, and 63 are provided so as to straddle the cavities 21, 22, and 23 along the d-axis direction. These center bridges 61, 62, 63 are for making the rotor core 15 in which the cavities 21 to 24 are formed difficult to be deformed.

FIG. 3 is a perspective view showing a state in which the end plate 42 and the short-circuit ring 45 of the rotor 4 are removed.
As shown in FIGS. 2 and 3, a plurality of conductor bars 41 provided in the rotor core 15 are inserted into the cavities 21 to 24. Specifically, conductor bars 41 are inserted at both ends in the longitudinal direction of the first cavity portion 21, the second cavity portion 22, and the third cavity portion 23, respectively. Further, a conductor bar 41 is inserted in the center of the fourth cavity portion 24 in the longitudinal direction.

Each conductor bar 41 is a plate-shaped member having a substantially rectangular cross-sectional shape orthogonal to the axial direction and elongated and uniform in the axial direction. The conductor bar 41 protrudes from both ends in the axial direction of the rotor core 15. Further, the conductor bar 41 is formed of a non-magnetic and conductive material such as an aluminum alloy or a copper alloy. Further, the conductor bar 41 inserted through the first cavity portion 21, the second cavity portion 22, and the third cavity portion 23 is predetermined from the corresponding first bridge 26, second bridge 27, and third bridge 28. They are arranged with a gap.

FIG. 4 is a perspective view showing a state in which the end plate 42 is attached to the rotor core 15.
As shown in the figure, the end plates 42 are arranged at both ends of the rotor core 15 in the axial direction so as to overlap the rotor core 15. The end plate 42 is formed of a non-magnetic material (for example, hard resin or the like) in a substantially disk shape, and its outer diameter is set to be substantially the same as the outer diameter of the rotor core 15. The end plate 42 presses the rotor core 15 from both sides in the axial direction to restrict the movement of the rotor core 15 with respect to the shaft 14 in the axial direction, or the rotor core 15 formed by laminating a plurality of electromagnetic steel sheets. To integrate. Further, the end plate 42 closes the openings at both ends in the axial direction of the cavities 21 to 24 formed in the rotor core 15.

A through hole 42a through which the shaft 14 can be press-fitted or shrink-fitted is formed in the radial center of the end plate 42. As a result, the end plate 42 is fixed to the shaft 14, and the axial movement of the rotor core 15 with respect to the shaft 14 is restricted.
Further, the end plate 42 is formed with conductor insertion holes 42b at positions corresponding to the conductor bars 41 inserted in the rotor core 15. A conductor bar 41 is inserted through these conductor insertion holes 42b. The conductor bar 41 projects to the outer surface 42c of the end plate 42 opposite to the rotor core 15 via the conductor insertion hole 42b.

Here, the opening area of the conductor insertion hole 42b is set to be slightly larger than the area of the cross section along the radial direction of the conductor bar 41. As a result, the conductor bar 41 is smoothly inserted into the conductor insertion hole 42b. In the present embodiment, the case of smooth insertion in this way is referred to as insertion. The press-fitting means, for example, in relation to the relationship between the opening area of the conductor insertion hole 42b and the area of the cross section along the radial direction of the conductor bar 41, the opening area of the conductor insertion hole 42b is in the radial direction of the conductor bar 41. It means that it is slightly smaller than the area of the cross section along the line. Therefore, in the case of press-fitting, the conductor bar 41 cannot be smoothly inserted into the conductor insertion hole 42b, and the conductor bar 41 is inserted into the conductor insertion hole 42b by, for example, applying a pressing force to the conductor bar 41. Therefore, for example, when the conductor bar 41 is press-fitted into the conductor insertion hole 42b, the conductor bar 41 is fixed to the end plate 42 (the same applies to shrink fitting).

As shown in FIG. 1, both ends in the axial direction of the conductor bar 41 protruding through the conductor insertion hole 42b of the end plate 42 are short-circuited by the short-circuit ring 45, respectively.
The short-circuit ring 45 is an annular member arranged apart from the end plate 42 by a predetermined interval K1 in both axial directions. The radial center of the short-circuit ring 45 also coincides with the rotation axis O. Like the conductor bar 41, the short-circuit ring 45 is made of a non-magnetic and conductive material. Specifically, the material of the short-circuit ring 45 is preferably the same material as the conductor bar 41, for example, an aluminum alloy or a copper alloy. However, it is not limited to this.

The short-circuit ring 45 is formed with a conductor insertion hole 45a at a position corresponding to the conductor bar 41. The opening area of these conductor insertion holes 45a is set to be slightly larger than the area of the cross section along the radial direction of the conductor bar 41. That is, the conductor bar 41 is inserted into the conductor insertion hole 45a of the short-circuit ring 45. The short-circuit ring 45 through which the conductor bar 41 is inserted is joined to the conductor bar 41 by, for example, brazing.

Here, for example, when the short-circuit ring 45 and the conductor bar 41 are joined by brazing, the predetermined distance K1 between the end plate 42 and the short-circuit ring 45 is the conductor insertion hole 45a of the short-circuit ring 45 and the end of the conductor bar 41. The interval is set so that the braze wraps around between the parts.
The joining of the short-circuit ring 45 and the conductor bar 41 is not limited to brazing, and it is sufficient that the short-circuit ring 45 and the conductor bar 41 can be joined. For example, the conductor bar 41 can be press-fitted into the conductor insertion hole 45a, or welding other than brazing can be adopted. Further, the conductor bar 41 may be press-fitted into the conductor insertion hole 45a of the short-circuit ring 45 instead of being inserted.

Next, a method of assembling the rotor 4 will be described with reference to FIGS. 1 and 5.
FIG. 5 is an exploded perspective view showing the rotor 4.
First, as shown in FIG. 5, the rotor core 15 is assembled to the shaft 14 by press fitting, shrink fitting, or the like. Further, the end plate 42 is arranged so as to abut on both ends in the axial direction of the rotor core 15 (end plate arrangement step). The end plate 42 is also assembled to the shaft 14 by press fitting or shrink fitting. Further, in the end plate arranging step, the end plate 42 is positioned in the circumferential direction with respect to the rotor core 15. This positioning is performed using, for example, a jig or the like.

Further, one end 41a of the conductor bar 41 is inserted into the conductor insertion hole 45a of one of the two short-circuit rings 45 in advance by a predetermined size. Then, in this state, one end 41a of the conductor bar 41 and the short-circuit ring 45 are joined by, for example, brazing to form the subunit 60 (subunit forming step).

Next, the other end 41b of the conductor bar 41 in the subunit 60 is directed to one end side in the axial direction of the rotor core 15, that is, the outer surface 42c of one end plate 42 of the two end plates 42. Then, the conductor insertion hole 42b of the end plate 42 and the conductor bar 41 are aligned in the circumferential direction, and the other end 41b of the conductor bar 41 is inserted into the conductor insertion hole 42b as it is. Further, the conductor bar 41 is inserted into each of the cavities 21 to 24 of the rotor core 15. Subsequently, the other end 41b of the conductor bar 41 is projected from the outer surface 42c of the other end plate 42 through the conductor insertion hole 42b of the other end plate 42 of the two end plates 42 (conductor bar insertion step).

Next, the conductor insertion hole 45a of the other short-circuit ring 45 of the two short-circuit rings 45 is inserted into the other end 41b of the conductor bar 41. Also at this time, the other end 41b of the conductor bar 41 is inserted into the conductor insertion hole 45a by a predetermined size. Then, in this state, the other end 41b of the conductor bar 41 and the short-circuit ring 45 are joined by, for example, brazing (short-circuit ring fixing step). As a result, the assembly work of the rotor 4 is completed.

Next, the operation of the rotary electric machine 1 will be described.
When driving the rotary electric machine 1, three-phase alternating current is supplied to the armature winding 13 of the stator 3. Then, a magnetic flux is formed on the predetermined teeth 11. Then, the teeth 11 on which the magnetic flux is formed are sequentially switched along the rotation direction (circumferential direction) of the rotor 4 (the formed magnetic flux rotates and moves).
At this time, an induced current is generated in the conductor bar 41 provided in the rotor core 15 in an asynchronous state until the rotor 4 in the stopped state rotates in synchronization with the rotational movement of the magnetic flux on the stator 3 side. That is, each conductor bar 41 functions as a secondary coil and generates a starting torque for rotating the rotor 4 with the stator 3.

Here, the conductor bars 41 arranged at both ends in the longitudinal direction of the first cavity portion 21, the second cavity portion 22, and the third cavity portion 23 correspond to the first bridge 26, the second bridge 27, and the third cavity, respectively. It is arranged with a predetermined gap from the three bridges 28. It is difficult for magnetic flux to pass through the gap. Therefore, by forming a predetermined gap, the magnetic flux formed by the stator 3 may be linked with the conductor bar 41, and a harmonic current that does not contribute to the rotation of the rotor 4 may flow to the conductor bar 41. It is suppressed. In other words, the harmonic flux caused by the torque ripple generated in the air gap G between the stator 3 and the rotor 4 is unlikely to interlink with each conductor bar 41, and harmonic secondary copper loss is unlikely to occur.

As described above, in the above-described embodiment, when assembling the rotor 4, one end 41a of the conductor bar 41 is inserted into the conductor insertion hole 45a of one of the two short-circuit rings 45 in advance by a predetermined size. Then, one end 41a of the conductor bar 41 and the short-circuit ring 45 are joined to form the subunit 60 (subunit forming step). After that, the conductor bar 41 is inserted into the conductor insertion hole 42b of the end plate 42 and the cavities 21 to 24 of the rotor core 15 (conductor bar insertion step).

That is, the conductor bars 41 are inserted into the conductor insertion holes 42b of the end plate 42 and the cavities 21 to 24 of the rotor core 15 in a state where the plurality of conductor bars 41 are positioned by one of the short-circuit rings 45. ing. Therefore, the conductor bar 41 can be easily assembled to the end plate 42 and the rotor core 15 without using a dedicated tool or jig. Further, it is possible to perform the joining work between the conductor bars 41 and the other short-circuit ring 45 while the plurality of conductor bars 41 are positioned by the short-circuit ring 45 on one side. Therefore, the joining operation between the conductor bar 41 and the other short-circuit ring 45 can be easily performed. Therefore, the assembling workability of the rotor 4 can be improved.

Further, the rotor 4 has end plates 42 that press the rotor core 15 from both sides in the axial direction of the rotor core 15. Then, before the conductor bar insertion step, the end plate 42 is arranged so as to abut on both ends in the axial direction of the rotor core 15 (end plate arrangement step). Therefore, the conductor bar insertion step can be performed while reliably holding the rotor core 15. Therefore, the assembly workability of the rotor 4 can be further improved.

(Modified example of embodiment)
Next, a modified example of the above-described embodiment will be described.

(First modification)
In the above-described embodiment, the opening area of the conductor insertion hole 42b formed in the end plate 42 is set to be slightly larger than the area of the cross section along the radial direction of the conductor bar 41, and the conductor bar is set in the conductor insertion hole 42b. The case where 41 is inserted has been described. However, the present invention is not limited to this, and the following configurations can be adopted.

That is, the opening area of the conductor insertion hole 42b of the end plate 42 arranged on one end side in the axial direction of the rotor core 15 is set to be slightly larger than the area of the cross section along the radial direction of the conductor bar 41. On the other hand, the opening area of the conductor insertion hole 42b of the end plate 42 arranged on the other end side in the axial direction of the rotor core 15 is set to be slightly smaller than the area of the cross section along the radial direction of the conductor bar 41, and the conductor is set. The conductor bar 41 is press-fitted into the insertion hole 42b.

Under such a configuration, in the conductor bar insertion step, the other end 41b of the conductor bar 41 is inserted from the end plate 42 side arranged on one end side in the axial direction of the rotor core 15. Then, the other end 41b of the conductor bar 41 is press-fitted into the conductor insertion hole 42b of the end plate 42 arranged on the other end side in the axial direction of the rotor core 15. As a result, the conductor bar 41 is fixed to the rotor core 15, and the conductor bar 41 is positioned in the axial direction with respect to the rotor core 15. Therefore, the short-circuit ring fixing step performed after this can be performed more easily, and the assembly workability of the rotor 4 can be further improved.

When the other end 41b of the conductor bar 41 is press-fitted into the conductor insertion hole 42b of the end plate 42, the other end 41b of the conductor bar 41 may be formed so as to be slightly tapered toward the end. With this configuration, even when the other end 41b of the conductor bar 41 is press-fitted into the conductor insertion hole 42b, the other end 41b of the conductor bar 41 can be smoothly inserted into the conductor insertion hole 42b. become.

(Second modification)
FIG. 6 is a perspective view showing the rotor 4 in the second modification of the present embodiment.
In the above-described embodiment, the case where the short-circuit ring 45 is arranged apart from the end plate 42 by a predetermined interval K1 in both axial directions has been described. However, the present invention is not limited to this, and as shown in FIG. 6, the end plate 42 and the short-circuit ring 45 may be configured to come into contact with each other.
In this case, in the short-circuit ring fixing step, the short-circuit ring 45 is brought into contact with each of the end plates 42 arranged on both sides of the rotor core 15 in the axial direction. Then, in this state, the other end 41b of the conductor bar 41 and the short-circuit ring 45 are joined by, for example, brazing.

With this configuration, the axial movement of the short-circuit ring 45 after the short-circuit ring fixing step is restricted. As a result, the conductor bar 41 is positioned in the axial direction with respect to the rotor core 15. Therefore, it is not necessary to separately consider the axial positioning of the conductor bar 41 with respect to the rotor core 15, and the workability of assembling the rotor 4 can be further improved.

(Third variant)
FIG. 7 is an exploded perspective view showing the rotor 4 in the third modification of the present embodiment, and corresponds to FIG. 5 described above.
In the above-described embodiment, the conductor bar 41 and the two short-circuit rings 45 are separately configured, and when the rotor 4 is assembled, one end 41a (see FIG. 5) of the conductor bar 41 is previously formed in the subunit forming step. The case where one of the short-circuit rings 45 is joined has been described. However, the present invention is not limited to this, and as shown in FIG. 7, a subunit 260 in which the conductor bar 41 and one of the short-circuit rings 45 are integrally formed may be provided. With such a configuration, the subunit forming step can be omitted, so that the assembling workability of the rotor 4 can be further improved.

In addition, in the above-described embodiment, a case has been described in which a conductor bar 41 is provided in each of the cavities 21 to 24 so as to generate a starting torque for rotating the rotor 4. However, the present invention is not limited to this, and the conductor bar 41 may be provided only in any of the cavities 21 to 24 among the cavities 21 to 24. Even in such a configuration, when the rotary electric machine 1 is driven, a starting torque can be generated in the rotor 4.
Further, in the above-described embodiment, the case where the rotor core 15 is formed with four layers of cavities 21 to 24 in each of the circumferential angle regions of 1/4 circumference (per pole) has been described. .. However, the present invention is not limited to this, and a plurality of cavities having four or more layers may be formed.

Further, in the above-described embodiment, each of the cavities 21 to 24 is curved so that the center in the circumferential direction is located most radially inward (so as to be convex inward in the radial direction). The case was explained. However, the present invention is not limited to this, and each of the cavities 21 to 24 may be formed in a convex shape inward in the radial direction. That is, each cavity 21 to 24 may not be curved.

Further, in the above-described embodiment, the case where the rotor core 15 is configured to have four poles has been described. However, the present invention is not limited to this, and the rotor core 15 may be composed of four or more poles.
Further, in the above-described embodiment, the case where the end plates 42 are arranged at both ends of the rotor core 15 in the axial direction so as to overlap with the rotor core 15 has been described. However, the present invention is not limited to this, and the end plate 42 may not be provided.

Further, in the above-described embodiment, the case where the shaft 14 is press-fitted or shrink-fitted into the radial center of the end plate 42 has been described. However, the present invention is not limited to this, and the shaft 14 is inserted into the through hole 42a of the end plate 42, a key is provided on either the inner peripheral surface of the through hole 42a or the outer peripheral surface of the shaft 14, and the key is provided on the other. The end plate 42 may be fixed to the shaft 14 by providing a key groove capable of receiving the above.

According to at least one embodiment described above, when assembling the rotor 4, one end 41a of the conductor bar 41 is previously inserted into the conductor insertion hole 45a of one of the two short-circuit rings 45 by a predetermined size. Is inserted, and one end 41a of the conductor bar 41 and the short-circuit ring 45 are joined to form the subunit 60 (subunit forming step). Further, the conductor bar 41 and one of the short-circuit rings 45 are integrally molded. After that, the conductor bar 41 is inserted into the conductor insertion hole 42b of the end plate 42 and the cavities 21 to 24 of the rotor core 15 (conductor bar insertion step).

That is, the conductor bars 41 are inserted into the conductor insertion holes 42b of the end plate 42 and the cavities 21 to 24 of the rotor core 15 in a state where the plurality of conductor bars 41 are positioned by one of the short-circuit rings 45. ing. Therefore, the conductor bar 41 can be easily assembled to the end plate 42 and the rotor core 15 without using a dedicated tool or jig. Further, it is possible to perform the joining work between the conductor bars 41 and the other short-circuit ring 45 while the plurality of conductor bars 41 are positioned by the short-circuit ring 45 on one side. Therefore, the joining operation between the conductor bar 41 and the other short-circuit ring 45 can be easily performed. Therefore, the assembling workability of the rotor 4 can be improved.

Further, the rotor 4 has end plates 42 that press the rotor core 15 from both sides in the axial direction of the rotor core 15. Then, before the conductor bar insertion step, the end plate 42 is arranged so as to abut on both ends in the axial direction of the rotor core 15 (end plate arrangement step). Therefore, the conductor bar insertion step can be performed while reliably holding the rotor core 15. Therefore, the assembly workability of the rotor 4 can be further improved.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, as well as in the scope of the invention described in the claims and the equivalent scope thereof.

1 ... Reluctance motor, 14 ... Shaft, 15 ... Rotor core, 21 ... First cavity (cavity), 22 ... Second cavity (cavity), 23 ... Third cavity (cavity), 24 ... 4th cavity (cavity), 26 ... 1st bridge (bridge), 27 ... 2nd bridge (bridge), 28 ... 3rd bridge (bridge), 29 ... 4th bridge (bridge), 41 ... Conductor bar , 41a ... One end, 41b ... The other end, 42 ... End plate, 42b ... Conductor insertion hole (insertion hole), 45 ... Short circuit ring, 60, 260 ... Subunit, O ... Rotating axis

Claims (4)

A shaft that rotates around the axis of rotation and
A rotor core fixed to the shaft and having a plurality of layers of cavities curved so as to be convex inward in the radial direction per pole.
A bridge formed between both ends in the longitudinal direction of the cavity having a plurality of layers and the outer peripheral surface of the rotor core when viewed from the direction of the rotation axis.
A cross-sectional shape that is arranged in the cavity portion of the plurality of layers at a certain interval from the corresponding bridge , and both ends extend so as to project from both ends in the rotation axis direction of the rotor core, and are orthogonal to the rotation axis. With multiple rectangular conductor bars,
A short-circuit ring provided at both ends of the plurality of conductor bars in the direction of the rotation axis and connecting the plurality of conductor bars,
Two end plates made of a non-magnetic material fixed to the shaft and holding the rotor core from both sides in the direction of the rotation axis,
With
In the method of assembling a reluctance rotary electric machine in which an insertion hole through which the conductor bar can be inserted is formed at a position corresponding to the conductor bar of the end plate .
A subunit forming step of fixing one end of the conductor bar to the short-circuit ring to form a subunit,
An end plate arranging step of arranging the end plates on both sides of the rotor core in the direction of the rotation axis,
After the subunit forming step and the end plate arranging step , the other end of the conductor bar is inserted into the cavity from one side of the rotor core in the direction of the rotation axis, and the direction of the rotation axis of the rotor core. A conductor bar insertion step of projecting the other end of the conductor bar to the other side,
After the conductor bar insertion step, a short-circuit ring fixing step of fixing the short-circuit ring to the other end of the conductor bar,
How to assemble a reluctance rotary electric machine with. The opening area of the insertion hole of the end plate arranged on one side of the rotor core in the direction of the rotation axis is larger than the area of the cross section orthogonal to the axial direction of the conductor bar, and the conductor bar can be inserted. It is set to the dimensions and
The opening area of the insertion hole of the end plate arranged on the other side of the rotor core in the direction of the rotation axis is smaller than the area of the cross section orthogonal to the axial direction of the conductor bar, and the conductor bar can be press-fitted. The method for assembling a relaxation rotary electric machine according to claim 1 , wherein the dimensions are set. The method for assembling a relaxation rotary electric machine according to claim 1 or 2 , wherein the short-circuit ring fixing step is performed in a state where each short-circuit ring is in contact with each end plate on both sides in the direction of the rotation axis. A shaft that rotates around the axis of rotation and
A rotor core fixed to the shaft and having a plurality of layers of cavities curved so as to be convex inward in the radial direction per pole.
A bridge formed between both ends in the longitudinal direction of the cavity having a plurality of layers and the outer peripheral surface of the rotor core when viewed from the direction of the rotation axis.
A cross-sectional shape that is arranged in the cavity portion of a plurality of layers at a certain interval from the corresponding bridge , and both ends extend so as to project from both ends in the rotation axis direction of the rotor core, and are orthogonal to the rotation axis. With multiple rectangular conductor bars,
A short-circuit ring provided at both ends of the plurality of conductor bars in the direction of the rotation axis and connecting the plurality of conductor bars,
With
A reluctance rotary electric machine in which the short-circuit ring and one end of the conductor bar are integrally molded.

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