JP6956488B2 - Rotor and reluctance motor - Google Patents

Description

Embodiments of the present invention relate to rotors and reluctance motors.

The reluctance motor includes a rotor and a stator. The rotor includes a shaft that is rotatably supported and extends in the axial direction at the center of the rotating shaft, and a rotor core that is externally fitted and fixed to the shaft. The stator is arranged on the outer circumference of the rotor core at intervals from the rotor core, and is wound around the stator core having a plurality of teeth arranged at intervals in the circumferential direction and the 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, the rotor core may be formed by laminating a plurality of electromagnetic steel sheets. In such a case, various techniques have been proposed as a method for integrally fixing the laminated electromagnetic steel sheets.
For example, there is a technique in which disk-shaped end plates (iron core retainers) are provided at both ends of the rotation axis of the rotor core, and the laminated electromagnetic steel sheets are pressed from both sides of the rotation axis by these end plates. Further, there is a technique of filling a plurality of cavities with a resin in addition to providing an end plate to firmly integrate the laminated electromagnetic steel sheets.

However, a special jig may be required to sufficiently fill the plurality of cavities with the resin. Considering that the jig is removed after filling with the resin, the manufacturing man-hours may increase and the manufacturing cost may increase.
In addition, when the end plates are provided at both ends of the rotation axis of the rotor core, it is difficult to confirm whether each cavity is sufficiently filled with resin, and there is a possibility that each cavity cannot be sufficiently filled with resin. there were.

JP-A-2009-303485

An object to be solved by the present invention is to provide a rotor and a reluctance motor capable of sufficiently filling a plurality of cavities formed in a rotor core with a resin.

The rotor of the embodiment has a shaft, a rotor core, a resin body, and a plate. The shaft rotates about the axis of rotation. The rotor core is fixed to the shaft, and four layers of cavities having a convex shape in the radial direction per pole are arranged in the radial direction. The resin body is filled in the cavity. The plates are arranged on both sides of the rotor core in the axial direction of rotation, and close the openings at both ends of the plurality of cavities in the axial direction. Further, the plate has a resin introduction port that communicates with the cavity and allows the resin body to be introduced into the cavity from the outside via the plate. On one surface of the plate on the rotor core side, a first cavity closest to the shaft and a second cavity next to the first cavity on the shaft among the four layers of cavities formed per pole. bets one resin introduction recess across only is formed. Further, on one surface of the plate on the rotor core side, one per pole protrudes radially outward from the position corresponding to each pole on the outer peripheral edge of the resin introduction recess, and the shaft of the cavity is next to the second cavity. A plurality of resin-introduced sub-recesses overlapping a part of the third cavity portion close to the above in the axial direction are formed. Then, the first cavity portion, the second cavity portion, and the third cavity portion per pole are communicated with each other through the resin introduction recess and the resin introduction sub-recess .

Partial sectional perspective view which shows the reluctance rotary electric machine of 1st Embodiment. FIG. 5 is a cross-sectional view orthogonal to the axial direction showing the rotor core of the first embodiment. The perspective view which shows the state which the end plate and the short-circuit ring of the rotor of 1st Embodiment were removed. The perspective view which shows the state which attached the end plate to the rotor core of 1st Embodiment. The plan view which shows the inner surface side of the end plate of 1st Embodiment. FIG. 3 is a perspective view in which a part of the end plate and the short-circuit ring of the rotor of the first embodiment is cut out. Partial sectional perspective view which shows the reluctance rotary electric machine of 2nd Embodiment.

Hereinafter, the rotor and the reluctance motor of the embodiment will be described with reference to the drawings.

(First Embodiment)
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 columnar rotor core 15 that is fitted and fixed to the shaft 14, and 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 at the center of the rotor core 15 in the radial direction. 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, each of the cavities 21 to 24 is 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 on the innermost side in the radial direction (so as to have a convex shape toward the inner side 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 iron 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 each of 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, the 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 projects 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 bars 41 inserted into the first cavity 21, the second cavity 22, and the third cavity 23 are predetermined from the corresponding first bridge 26, second bridge 27, and third bridge 28. They are arranged with a gap.

Further, the rotor core 15 is filled with a resin body 51 in addition to the locations where the conductor bars 41 of the cavities 21 to 24 are arranged. In the resin body 51, for example, when a plurality of electromagnetic steel sheets are laminated to form the rotor core 15, the laminated electromagnetic steel sheets are firmly integrated. Further, the conductor bar 41 can be fixed to the rotor core 15 by filling the cavities 21 to 24 with the resin body 51. Further, by forming each of the cavities 21 to 24, the rotor core 15 tends to be easily deformed, but by filling each of the cavities 21 to 24 with a resin body 51, the rotor core 15 is deformed. It can be difficult to do.

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 in a substantially disk shape by a non-magnetic material (for example, hard resin or the like), 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 at the center of the end plate 42 in the radial direction. 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.
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 a key groove capable of receiving the key is provided on the other. As a result, the end plate 42 may be fixed to the shaft 14.

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.

FIG. 5 is a plan view showing the inner surface 42d side of the end plate 42 overlapping with the rotor core 15, and FIG. 6 is a perspective view in which a part of the end plate 42 and the short-circuit ring 45 of the rotor 4 is cut out.
As shown in FIGS. 5 and 6, a resin introduction recess 52 having a substantially annular shape when viewed from the axial direction is formed on the inner surface 42d of the end plate 42 so as to surround the periphery of the through hole 42a (shaft 14). .. More specifically, the resin introduction recess 52 is set so large that the inner diameter is formed at a predetermined interval K1 from the through hole 42a and the outer diameter is not in contact with the conductor insertion hole 42b. The radial width of the resin introduction recess 52 is set so that the resin introduction recess 52 straddles the first cavity 21 and the second cavity 22 when the end plate 42 is superposed on the rotor core 15. ..

Further, on the outer peripheral edge of the resin introduction recess 52, the conductor bar 41 arranged in the fourth cavity 24 is radially projected toward the conductor insertion hole 42b at a position corresponding to the conductor insertion hole 42b into which the conductor bar 41 is inserted. The resin introduction sub-recess 53 is formed at four locations. The resin introduction sub-recess 53 communicates with the resin introduction recess 52 and is formed at a position overlapping the third cavity 23 when viewed from the axial direction. By forming the resin introduction sub-recess 53, the recesses (resin introduction recess 52, resin introduction sub-recess 53) are formed in the widest possible range of the inner surface 42d of the end plate 42. Then, the first cavity portion 21, the second cavity portion 22, and the third cavity portion 23 are communicated with each other through the resin introduction recess 52 and the resin introduction sub-recess 53.

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 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 and is formed of, 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. A conductor bar 41 is inserted through these conductor insertion holes 45a. The short-circuit ring 45 through which the conductor bar 41 is inserted is joined to the conductor bar 41 by, for example, brazing.
When the short-circuit ring 45 and the conductor bar 41 are joined by brazing, for example, the predetermined distance between the short-circuit ring 45 and the end plate 42 is between the conductor insertion hole 45a of the short-circuit ring 45 and the end of the conductor bar 41. In addition, the interval is set so that the braze wraps around sufficiently. Further, 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.

Next, a method of manufacturing the rotor 4 will be described.
First, the rotor core 15 and the end plate 42 are assembled to the shaft 14 by press fitting, shrink fitting, or the like, and the conductor bars 41 are provided in the conductor insertion holes 42b of the cavity portions 21 to 24 of the rotor core 15 and the end plate 42, respectively. insert. At this time, the inner surface 42d (see FIG. 5) of the end plate 42 is brought into contact with both ends of the rotor core 15 in the axial direction. Further, the rotor core 15 and the end plate 42 are positioned in the circumferential direction by using a jig (not shown) or the like.

Next, the conductor insertion holes 45a of the short-circuit ring 45 are inserted into both ends of each conductor bar 41 in the axial direction. Then, both ends in the axial direction of each conductor bar 41 and the short-circuit ring 45 are joined by brazing or the like. As a result, the assembling work of the shaft 14, the rotor core 15, the conductor bar 41, the end plate 42, and the short-circuit ring 45 is completed.

Subsequently, the resin bodies 51 are filled in the cavities 21 to 24 of the rotor core 15. As a method of this filling work, for example, a vacuum impregnation method is adopted. That is, first, the rotor 4 is immersed in the container in which the molten resin is stored while evacuating the cavities 21 to 24 of the rotor core 15 using a vacuum pump. Then, the resin melted in the rotor core 15 is formed from a slight clearance formed between the conductor insertion hole 42b formed in the end plate 42 and the conductor bar 41 inserted in the conductor insertion hole 42b. The resin flows into the cavities 21 to 24 through the conductor insertion holes 42b. That is, the conductor insertion hole 42b of the end plate 42 (a slight clearance of the conductor insertion hole 42b through which the conductor bar 41 is inserted) functions as a resin introduction port for resin to flow into each of the cavities 21 to 24.

Here, the resin introduction recess 52 and the resin introduction sub-recess 53 are formed on the inner surface 42d of the end plate 42. Then, the first cavity portion 21, the second cavity portion 22, and the third cavity portion 23 are communicated with each other through the recesses 52 and 53. Therefore, the resin that has flowed into any one of the first cavity portion 21, the second cavity portion 22, and the third cavity portion 23 passes through the recesses 52 and 53 to the other first cavity portions 21, the second cavity portion 21, and the second cavity portion 23. It flows into either the cavity 22 or the third cavity 23. That is, the resin is evenly distributed in the cavities 21, 22, and 23 through the recesses 52 and 53.
The resin filled in each of the cavities 21 to 24 is then cooled to become a resin body 51. As a result, the production 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 first embodiment, the resin is introduced on the inner surfaces 42d of the end plates 42 provided at both ends in the axial direction of the rotor core 15 so as to straddle the first cavity portion 21 and the second cavity portion 22. A recess 52 is formed. Further, a resin introduction sub-recess 53 that overlaps with the third cavity 23 when viewed from the axial direction is formed on the outer peripheral edge of the resin introduction recess 52. Then, the first cavity portion 21, the second cavity portion 22, and the third cavity portion 23 are communicated with each other through the recesses 52 and 53. Therefore, for example, when the cavities 21 to 24 are filled with resin by the vacuum impregnation method, the cavities 21 to 23 (first cavity 21, second cavity 22, third) are passed through the recesses 52 and 53. The resin can be evenly distributed throughout the cavity 24). Further, since the resin flow path is increased by the amount of forming the recesses 52 and 53, the flow of the resin is improved. Therefore, the resin can be sufficiently filled in each of the cavities 21 to 24 without using a special jig.

Further, the resin introduction recess 52 of the end plate 42 is formed in a substantially annular shape when viewed from the axial direction. Therefore, not only the cavities 21 to 23 formed per pole, but also these cavities 21 to 23 and the other cavities 21 to 23 formed in the other poles are formed in the recesses 52 and 53, respectively. Can communicate through. Therefore, the resin can be more reliably distributed to the cavities 21 to 23.

Further, conductor bars 41 are arranged in the cavities 21 to 24, and both ends of the conductor bars 41 in the axial direction are short-circuited by a short-circuit ring 45. Then, the conductor bar 41 functions as a secondary coil to generate a starting torque for rotating the rotor 4 with the stator 3. Therefore, the rotor 4 can be started without using an inverter or the like.
Further, the conductor insertion hole 42b (a slight clearance of the conductor insertion hole 42b through which the conductor bar 41 is inserted) through which the conductor bar 41 formed in the end plate 42 is inserted is a resin through which the resin flows into each of the cavities 21 to 24. It functions as an introduction port. Therefore, when the cavities 21 to 24 are filled with the resin by the vacuum impregnation method, it is not necessary to separately provide the resin introduction port on the end plate 42. Therefore, the processing cost of the end plate 42 can be reduced.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIG. 7.
FIG. 7 is a partial cross-sectional perspective view showing the rotary electric machine 201 according to the second embodiment.
The same aspects as those of the above-described first embodiment are designated by the same reference numerals and the description thereof will be omitted.
As shown in the figure, in the second embodiment, the end plates 42 (see FIG. 1 described above) are not provided at both ends of the rotor core 15 in the axial direction, and the rotor core 15 is directly connected to both ends in the axial direction. A short circuit ring 245 is arranged. This point is different from the above-mentioned first embodiment.

The short-circuit ring 245 is made of, for example, aluminum die-cast, and closes the openings at both ends in the axial direction of the cavities 21 to 24. Both ends of the conductor bar (not shown) in the axial direction are connected and fixed to the short-circuit ring 245 by, for example, fusion. As a result, each conductor bar (not shown) is short-circuited by the short-circuit ring 245.

Here, on the inner surface of the short-circuit ring 245 on the rotor iron core 15 side, a resin introduction recess 252 and a resin introduction sub-recess 253 that are substantially annular when viewed from the axial direction are formed. The resin introduction recess 252 and the resin introduction sub-recess 253 communicate at least two or more layers of cavities 21 to 24 (see FIG. 2 above) per pole.
Further, the short-circuit ring 245 is formed with a plurality of (for example, four) resin introduction ports 54 for allowing resin to flow into the cavities 21 to 24 so as to communicate with each other inside and outside the short-circuit ring 245.
Therefore, according to the second embodiment described above, the same effect as that of the first embodiment described above can be obtained.

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 or may not be provided only in any of the hollow portions 21 to 24 among the hollow portions 21 to 24. When the conductor bar 41 is not provided, it is not necessary to provide the short circuit rings 45 and 245.
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.

According to at least one embodiment described above, the inner surface 42d of the end plate 42 provided at both ends in the axial direction of the rotor core 15 and the inner surface of the short-circuit ring 245 have 2 per pole of each of the cavities 21 to 24. By forming the resin introduction recesses 52 and 252 and the resin introduction sub-recesses 53 and 253 straddling the cavities 21 to 24 of the layer or more (for example, the three cavities 21 to 23 in the first embodiment described above). The resin can be evenly distributed to the cavities 21 to 24 through the recesses 52, 53, 252, 253. Therefore, the resin can be sufficiently filled in each of the cavities 21 to 24 without using a special jig.

Further, the resin introduction recesses 52 and 252 of the end plate 42 are formed in a substantially annular shape when viewed from the axial direction. Therefore, not only the cavities 21 to 23 formed per pole but also the cavities 21 to 23 and the other cavities 21 to 23 formed in the other poles are formed in the recesses 52 and 252. Can communicate through. Therefore, the resin can be more reliably distributed to the cavities 21 to 23.

Further, conductor bars 41 are arranged in the cavities 21 to 24, and both ends of the conductor bars 41 in the axial direction are short-circuited by short-circuit rings 45 and 245. Then, the conductor bar 41 functions as a secondary coil to generate a starting torque for rotating the rotor 4 with the stator 3. Therefore, the rotor 4 can be started without using an inverter or the like.

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, 201 ... reluctance rotating electrical machine, 14 ... shaft, 15 ... rotor core 21 ... first cavity (cavity), 22 ... second cavity (hollow portion), 23 ... third cavity (hollow portion) , 24 ... 4th cavity (cavity), 41 ... Conductor bar, 42 ... End plate (rotor end plate), 42b ... Conductor insertion hole (insertion hole, resin introduction port), 45, 245 ... Short circuit ring, 51 ... Resin body, 52, 252 ... Resin introduction recess, 53, 253 ... Resin introduction sub-recess (resin introduction recess), 54 ... Resin introduction port, O ... Rotating axis

Claims (5)

A shaft that rotates around the axis of rotation and
A rotor core that is fixed to the shaft and has four layers of cavities that are radially inwardly convex per pole and are arranged in the radial direction.
The resin body filled in the cavity and
Plates arranged on both sides of the rotor core in the direction of the rotation axis and closing the openings at both ends in the axial direction of the plurality of cavities,
With
The plate has a resin introduction port that communicates with the cavity and allows the resin body to be introduced into the cavity from the outside via the plate.
On one surface of the plate on the rotor core side, a first cavity portion closest to the shaft among the four layers of the cavity portions formed per pole, and the shaft next to the first cavity portion. One resin introduction recess is formed so as to straddle only the second cavity close to the second cavity, and one resin introduction recess protrudes outward in the radial direction from a position corresponding to each pole on the outer peripheral edge of the resin introduction recess. Of these, the shaft is formed with a plurality of resin-introduced sub-recesses that are axially overlapped with a part of the third cavity portion next to the second cavity portion.
A rotor in which the first cavity portion, the second cavity portion, and the third cavity portion per pole are communicated with each other through the resin introduction recess and the resin introduction sub-recess. The rotor according to claim 1, further comprising a plurality of conductor bars arranged in the cavity and connected to the plate. The plate is a rotor end plate that presses and holds the rotor core from both sides in the direction of the rotation axis, has an insertion hole through which each of the conductor bars can be inserted, and the insertion hole functions as the resin introduction port. And
The plurality of conductor bars project via the plate to the side of the plate opposite to the rotor core.
The rotor according to claim 2 , further comprising 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. The rotor according to any one of claims 1 to 3, wherein the resin introduction recess is formed in an annular shape when viewed from the direction of the rotation axis so as to surround the periphery of the shaft. The rotor according to any one of claims 1 to 4.
A reluctance rotary electric machine provided with a stator provided so as to surround the rotor and around which an armature winding is wound.

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