WO2015198382A1

WO2015198382A1 - Rotating electric machine synchronous rotor

Info

Publication number: WO2015198382A1
Application number: PCT/JP2014/066585
Authority: WO
Inventors: 真臣森下
Original assignee: 日産自動車株式会社
Priority date: 2014-06-23
Filing date: 2014-06-23
Publication date: 2015-12-30
Also published as: JPWO2015198382A1; JP6656149B2

Abstract

Provided is a rotating electric machine synchronous rotor in which the anti-centrifugal strength reliability of a rotor core can be improved. The rotating electric machine synchronous rotor (1) is equipped with: a cylindrical rotor core (2) formed by stacking a plurality of circular arc-shaped core plates (2a); and permanent magnets (3) buried in the rotor core (2), wherein joint portions (weld joint portions (11)) for joining the circular arc-shaped core plates (2a) stacked in a rotor axis (Ax) direction to each other are provided on an inner circumferential side of the rotor core (2), and the circular arc-shaped core plates (2a) include magnet holes (3a) opened on a plate outer circumferential side, and notch portions (6) formed by notching both ends (2PE, 2PE) of an inner circumferential surface (2IP) of the core plates (2a) while avoiding portions that become the joint portions (weld joint portions (11)).

Description

Synchronous rotor for rotating electrical machines

The present invention relates to a synchronous rotor for a rotating electrical machine including a cylindrical rotor core formed by laminating a plurality of arc-shaped core plates and a permanent magnet embedded in the rotor core.

As a synchronous rotor of a rotating electrical machine, a rotor core formed by stacking a plurality of divided core plates in an annular shape and a magnet (permanently) inserted into a magnet hole (magnet hole) formed in the divided core plate Magnet). Conventionally, as a synchronous rotor, two through holes are formed on the inner peripheral side of the divided core plate, and when the divided core plate is arranged in an annular shape, the through holes are arranged at equal intervals. The rotor core is laminated so that the through-holes communicate with each other along the axial direction of the rotor core, and a fixing pin is inserted into the communicating through-hole. That is, a structure in which split core plates stacked in the axial direction are coupled to each other by a fixing pin is known (for example, see Patent Document 1).

JP 2008-092650 A

However, in the conventional synchronous rotor for rotating electrical machines, the end core region from the fixed pin to the end face of the split core plate has a cantilever structure that is not restrained or supported in the split core plate. For this reason, in the end region where the cantilever structure is formed, the deformation in the outer diameter direction is increased due to the centrifugal force generated when the rotor rotates as compared with the region where the cantilever structure is not used. And in the end region which becomes a cantilever structure, due to the deformation due to the centrifugal force, the stress of the bridge portion where the wall thickness between the outer peripheral end of the split core plate and the outer diameter side of the magnet hole is relatively thin increases. There is a risk of damaging the bridge. For this reason, the problem that the reliability with respect to centrifugal strength of the rotor core is lowered has occurred.

The present invention has been made paying attention to the above problem, and an object of the present invention is to provide a synchronous rotor for rotating electrical machines that can improve the centrifugal strength reliability of the rotor core.

In order to achieve the above object, a synchronous rotor for a rotating electrical machine according to the present invention includes a cylindrical rotor core formed by stacking a plurality of arc-shaped core plates, and a permanent magnet embedded in the rotor core. Yes.
In this rotary electric machine synchronous rotor, a coupling portion that couples the plurality of arc-shaped core plates stacked in the rotor axial direction is provided on the inner peripheral side of the rotor core.
The arc-shaped core plate has a magnet hole opened on the outer peripheral side of the plate, and a cutout portion formed by cutting out both end portions of the inner peripheral surface of the core plate that avoids the portion to be the coupling portion.

Therefore, the arc-shaped core plate in the synchronous rotor for rotating electrical machines has a cantilever structure in the region from the coupling portion to the end portion of the core plate, and has a notch in that region.
That is, when the rotor rotates, the centrifugal force generated at both ends of the core plate is reduced by having the notches at both ends of the inner peripheral surface of the core plate in that region. By reducing the centrifugal force, deformation due to the centrifugal force in the outer diameter direction at both ends of the core plate can be suppressed to be small, and an increase in the stress of the bridge portion can be suppressed.
As a result, the centrifugal strength reliability of the rotor core can be improved during rotor rotation.

1 is an exploded perspective view of a synchronous rotor for a rotating electrical machine according to Embodiment 1. FIG. FIG. 3 is a schematic plan view of an arc-shaped core plate that forms the rotor core according to the first embodiment. It is an assembly block diagram which has arrange | positioned the core plate on the some circular arc of Example 1 cyclically | annularly. It is a block diagram which laminates | stacks the core plate on the some circular arc of Example 1, and assembles a rotor core. It is a rotor welding joining process figure in which the continuous welding part of Example 1 was formed. FIG. 6 is a process diagram for inserting a permanent magnet into the magnet hole of the first embodiment. 6 is a schematic plan view of an arc-shaped core plate that forms a rotor core according to Embodiment 2. FIG. FIG. 10 is a schematic enlarged plan view of a notch portion showing a modified example of the curved shape of the notch portion according to the second embodiment. FIG. 10 is a schematic enlarged plan view of a notch portion showing a modification of the linear shape of the notch portion according to the second embodiment. 6 is a schematic plan view of an arc-shaped core plate that forms a rotor core according to Embodiment 3. FIG.

Hereinafter, the best mode for realizing a synchronous rotor for a rotating electrical machine according to the present invention will be described based on Examples 1 to 3 shown in the drawings.

First, the configuration will be described.
FIG. 1 is an exploded perspective view of a synchronous rotor for a rotating electrical machine according to a first embodiment. Hereinafter, the overall configuration will be described with reference to FIG. Note that some details of the second and lower layers from the top are omitted.

The synchronous rotor 1 for a rotating electrical machine according to the first embodiment constitutes a motor together with a stator, and is applied, for example, as a travel drive source for an electric vehicle or a hybrid vehicle.

The rotating electrical machine synchronous rotor 1 has a cylindrical rotor core 2, a permanent magnet 3 embedded in the rotor core 2, and a rotor shaft 4 fitted to the rotor core 2.

The rotor core 2 is formed in a cylindrical shape having a space inside by laminating a plurality of arc-shaped core plates 2a (see FIG. 2) in an annular shape and laminating the annularly arranged core plates 2a. Yes.

The arc-shaped core plate 2a is made of an electromagnetic steel plate, and as shown in FIG. 2, the arc angle θ1 is 120 °, and has a magnet hole 3a, a welded portion 5, and a notch portion 6. is doing. As shown in FIG. 2, four magnet holes 3a and four welds 5 are formed in the core plate 2a at equal intervals. Moreover, as shown in FIG. 2, the both ends 2PE and 2PE of the core plate 2a have a notch 6.

As shown in FIG. 2, the magnet hole 3a is a hole for inserting the permanent magnet 3 opened on the outer peripheral side of the plate. The shape of the magnet hole 3a is formed in a rectangular shape spreading in the circumferential direction.

The weld 5 is formed at the inner peripheral edge of the plate as shown in FIG. As shown in the lower right enlarged view of FIG. 2, the welded portion 5 has a concave surface 5a and a convex portion 5b. The concave surface 5a is formed to be recessed in the outer diameter direction from the inner peripheral surface 2IP of the core plate 2a. The shape of the concave surface 5a is a curved surface as shown by the solid line and the broken line. The convex portion 5b is formed on a part of the concave surface 5a so as to protrude from the concave surface 5a to the inner peripheral surface 2IP of the core plate 2a. The shape of the convex part 5b is formed in a triangular shape.

As shown in FIG. 2, the notch portion 6 is a position that avoids a portion to be a weld joint portion 11 (joint portion, weld bead, see FIG. 5) described later, that is, a weld portion 5, and is within the core plate 2a. Both end portions 2PE and 2PE of the peripheral surface 2IP are cut out.
As shown in FIG. 2, the notch 6 has a shape in which a region A from the offset position 2FS to the end surface 2EF of the core plate 2a is notched to a predetermined depth PD from the inner peripheral surface 2IP of the core plate in the outer diameter direction. (Shape of the notch 6) is set. In the region A, the predetermined depth PD in the first embodiment is constant in the outer diameter direction from the inner peripheral surface 2IP of the core plate 2a.
Here, the offset position 2FS is a position offset from the welded portion 5 by the offset amount FS toward the circumferential end face of the core plate 2a. In addition, the welding part 5 used as this object is the welding part 5 arrange | positioned at the edge part 2PE side of the core plate 2a, as shown in FIG. Further, the offset amount FS offset from the welded portion 5 to the circumferential end surface side of the core plate 2a is an amount that can be formed by a welded joint portion 11 (joint portion, weld bead, see FIG. 5) described later, that is, welding. This is an amount for securing the part 5. As a specific offset amount FS, as shown in FIG. 2, it is from the circumferential center position (a radial axis CL described later) of the welded portion 5 to the offset position 2FS.
Furthermore, the predetermined depth PD is a depth that does not reach the magnet hole 3a disposed on the end 2PE side of the core plate 2a from the inner peripheral surface 2IP of the core plate 2a, and is inserted into the magnet hole 3a. The depth is set in consideration of the formation of magnetic field lines by the permanent magnet 3. That is, the notch 6 is formed while maintaining the formation of the magnetic lines of force by the permanent magnet 3.

As shown in FIG. 2, the welded portion 5 is disposed on the same axis line of the radial axis CL that connects the center point O of the core plate 2a and the center position in the circumferential direction of the magnet hole 3a in the radial direction. That is, the center positions in the circumferential direction of the magnet hole 3a and the welded portion 5 are arranged on the same axis line of the radial axis line CL. Similarly, the circumferential center positions of the concave surface 5a and the convex portion 5b are also arranged on the same axis line of the radial axis line CL.
Here, the center point O of the core plate 2a is the same as the center point O when the plurality of arc-shaped core plates 2a are annularly arranged (see FIG. 3). That is, since the rotor core 2 is formed by laminating the annularly arranged core plates 2a, the center point O of the core plate 2a is the same as the center point of the rotor core 2. The inner peripheral surface 2IP of the core plate 2a and the inner peripheral surface 2IP of the rotor core 2 have the same center point for the same reason.

A cylindrical rotor core 2 is formed by laminating a plurality of such arc-shaped core plates 2a. On the inner peripheral surface 2IP of the rotor core 2 thus formed, a linear continuous welded portion 10 is formed by the welded portions 5 between the plurality of core plates 2a stacked in the rotor axis Ax direction (see FIG. 5).

By welding this continuous weld 10 together, a weld bead 11 (weld joint, joint) is formed as shown in FIGS. Thereby, the laminated | stacked several core plates 2a are couple | bonded. This welding joining may be performed by melting the base material, that is, the convex portion 5b of the welded portion 5 in the continuous welded portion 10, or may be performed by melting the convex portion 5b and the welding wire. The amount of melting of the welding wire is such that it is within the concave surface 5a of the welded portion 5, that is, within the range from the concave surface 5a to the inner peripheral surface 2IP of the core plate 2a.
In addition, since the notch part 6 is formed avoiding the welding part 5 used as the weld bead 11, the uniformity of the shape of the weld bead 11 can be ensured.

The rotor shaft 4 is formed in a cylindrical shape having a space inside. A rotation shaft (not shown) or the like is inserted into this inner space. The rotor shaft 4 is press-fitted into the rotor core 2 so that the rotor shaft 4 is fitted to the rotor core 2.

Next, the operation will be described.
The operation of the rotating electrical machine synchronous rotor 1 according to the first embodiment will be described by dividing it into “a manufacturing method of the rotating electrical machine synchronous rotor”, “a characteristic operation of the rotating electrical machine synchronous rotor”, and “an operation of the notch shape”.

[Method of manufacturing synchronous rotor for rotating electrical machine]
Based on FIGS. 2 to 6, the operation of manufacturing the synchronous rotor for a rotating electrical machine according to the present invention will be described. A method of manufacturing a synchronous rotor 1 for a rotating electrical machine comprising a synchronous rotor 1 having a cylindrical rotor core 2 formed by laminating a plurality of arc-shaped core plates 2a and a permanent magnet 3 embedded in the rotor core 2. Includes a core plate forming step, a rotor core assembling step, a rotor welding joining step, and a permanent magnet insertion step. Hereinafter, each step will be described. Note that some details of the second and lower layers from the top of FIGS. 5 and 6 are partially omitted.

(Core plate forming process)
In the core plate forming step, as shown in FIG. 2, a magnet hole 3a for inserting the permanent magnet 3 opened on the outer peripheral side of the plate and an inner peripheral end of the plate are formed in the arc-shaped core plate 2a. The welded portion 5 and the notched portion 6 in which both end portions 2PE and 2PE of the inner peripheral surface 2IP of the core plate 2a are notched are formed.

(Rotor core assembly process)
In the rotor core assembling step, as shown in FIG. 3, a plurality of arc-shaped core plates 2a are annularly arranged. That is, as shown in FIG. 2, about three core plates 2a having an arc angle θ1 of 120 ° are used and arranged in an annular shape. In FIG. 4, the annularly disposed core plate 2a is defined as a first layer. The cylindrical rotor core 2 is assembled by stacking the annular core plates 2a. That is, as shown in FIG. 4, on the first layer core plate 2a, the first layer core plate 2a is shifted from the first layer core plate 2a by an angle θ2 (= 30 °) in the rotational direction of the rotor core 2 (for example, counterclockwise). A two-layer core plate 2b is laminated. Subsequently, as shown in FIG. 4, the third layer core plate 2 c is laminated on the second layer core plate 2 b so as to be shifted 30 ° counterclockwise with respect to the second layer core plate 2 b. Thus, the cylindrical rotor core 2 is formed by laminating the next layer so as to be shifted counterclockwise by 30 ° with respect to the previous layer, that is, straddling the joint between the core plates 2a of the previous layer. Is assembled. For assembling this cylindrical rotor core 2, for example, about 54 core plates 2a are used, and about 18 layers are laminated.

(Rotor welding joining process)
In the rotor welding joining process, alignment is performed so that the magnet holes 3a between the plurality of core plates 2a stacked in the rotor axis Ax direction of the rotor core 2 communicate with each other in the rotor axis Ax direction. That is, alignment is performed so that the permanent magnet 3 can be inserted into the communicating magnet hole 3a (see FIG. 5). This alignment is performed using a jig. As shown in FIG. 5, a linear continuous welded portion 10 that is continuous by a welded portion 5 between a plurality of core plates 2a stacked in the rotor axis Ax direction on the inner peripheral surface 2IP of the rotor core 2 that has been aligned. Is formed. Next, the continuous welded portion 10 is disposed on the same axis line of the radial axis CL that connects the center position in the circumferential direction of the magnet hole 3a and the center point of the rotor core 2 (center point of the core plate 2a) O in the radial direction. In this state, the continuous weld 10 is welded. Thereby, as shown in FIG. 6, the weld bead 11 is formed.

(Permanent magnet insertion process)
In the permanent magnet insertion step, after alignment and welding and joining, as shown in FIG. 6, the permanent magnet 3 is inserted into the communicating magnet hole 3a. The rotor shaft 4 is fitted into the rotor core 2 by press-fitting the rotor shaft 4 into the rotor core 2 thus manufactured.

After passing through the above process, in addition to inserting the permanent magnet 3 into the magnet hole 3a, the synchronous rotor 1 for rotary electric machines can be manufactured by welding the welding part 5 between the several core plates 2a. .

Thus, by manufacturing the synchronous rotor for rotary electric machines, in Example 1, since the convex part 5b can be welded intensively, the penetration of the weld bead 11 is achieved while minimizing the amount of heat input during welding. The width and depth can be adjusted constant (stable) and easily, and the joining strength of the rotor core 2 can be increased. In addition, since the anti-centrifugal strength can be ensured by welding joint between the core plates 2a by a single piece of the synchronous rotor 1 assembly, damage due to load input to the permanent magnet 3 is prevented. As a result, the durability reliability of the permanent magnet 3 can be improved by ensuring the centrifugal strength of the rotor core 2.
In addition, since the weld bead 11 is accommodated in the concave surface 5 a of the welded portion 5, the trouble of processing the rotor shaft 4 according to the rotor core 2 becomes unnecessary. That is, the surface of the rotor shaft 4 may be a simple cylindrical shape as shown in FIG.

[Characteristic action of synchronous rotor for rotating electrical machines]
For example, the split core plate is formed with a magnet hole for inserting a permanent magnet and two through holes for inserting a fixing pin. The through holes are formed on the inner peripheral side of the divided core plate. When the divided core plates are arranged in an annular shape, the through holes are arranged at equal intervals. Then, a rotor core is formed by laminating a plurality of divided core plates formed in this manner while being arranged in an annular shape, a permanent magnet is inserted into the magnet hole, and a fixing pin is inserted into the through hole. A synchronous rotor in which the rotor shaft is fitted to the rotor core, that is, the divided core plates laminated in the axial direction by the fixing pins is used as a comparative example. According to the synchronous rotor of this comparative example, the end region from the fixed pin to the end face of the split core plate in the split core plate has a cantilever structure that is not restrained or supported.

However, in the end region where the cantilever structure is formed, the deformation in the outer diameter direction becomes larger due to the centrifugal force generated when the rotor rotates than the region where the cantilever structure is not formed. And in the end region which becomes a cantilever structure, due to the deformation due to the centrifugal force, the stress of the bridge portion where the wall thickness between the outer peripheral end of the split core plate and the outer diameter side of the magnet hole is relatively thin increases. The bridge portion may be damaged (for example, permanent deformation). For this reason, there existed a subject that the centrifugal strength reliability of a rotor core fell.

Also, when the rotor core is assembled by stacking the split core plates, positional deviation occurs in the end surfaces of the split core plates due to assembly variations. At this time, the inner peripheral side end of the split core plate protrudes from the inner peripheral surface of the rotor core due to the positional deviation. For this reason, the subject that the protrusion part will increase internal diameter variation occurred.

As described above, there was a problem that reliability of the centrifugal strength of the rotor core was lowered. In addition, there is a problem that the protrusion increases the inner diameter variation.

On the other hand, in the first embodiment, the arc-shaped core plate 2a in the synchronous rotor 1 for a rotating electrical machine has a region B (hatched portion in FIG. 2) from the weld joint portion 11 (joint portion) to the end portion 2PE of the core plate 2a. ) Is a cantilever structure, and a configuration having a notch 6 in the region B where the cantilever structure is adopted.
That is, the mass of the region B having a cantilever structure is reduced. For this reason, when the rotor rotates, the notch 6 is provided at both ends 2PE and 2PE of the inner peripheral surface 2IP of the core plate 2a in the region B, thereby reducing the centrifugal force generated at both ends 2PE and 2PE of the core plate 2a. Is done. By reducing the centrifugal force, the deformation due to the centrifugal force in the outer diameter direction of both end portions 2PE, 2PE of the core plate 2a can be suppressed to be small, and an increase in the stress of the bridge portion C (FIG. 2) can be suppressed.
Therefore, the centrifugal strength reliability of the rotor core 2 can be improved when the rotor rotates.

In addition, since both end portions 2PE and 2PE of the inner peripheral surface 2IP of the core plate 2a are notched, when the rotor core 2 is manufactured, the end portion 2PE of the inner peripheral surface 2IP of the core plate 2a is changed from the inner peripheral surface 2IP of the rotor core 2 to the core plate 2a. Since the amount of protrusion protruding toward the (inner peripheral side end) is reduced, it is possible to suppress an increase in inner diameter variation. For this reason, the dimensional quality of the rotor core 2 can be improved.

[Operation of notch shape]
In the first embodiment, the notch 6 is predetermined in the outer diameter direction from the inner peripheral surface 2IP of the core plate 2a in the region A from the offset position 2FS to the end surface 2EF of the core plate 2a in the region B having the cantilever structure. The structure set to the shape of notch depth PD cutout (shape of the cutout portion 6) was adopted.
That is, the mass of the region B having a cantilever structure is reduced. For this reason, the centrifugal force generated when the rotor rotates is reduced as compared with the case where the shape of the notch 6 is not set.
Therefore, at the time of rotor rotation, the deformation | transformation by the centrifugal force to the outer-diameter direction of both ends 2PE and 2PE of the core plate 2a can be restrained small.

Next, the effect will be described.
In the rotating electrical machine synchronous rotor 1 of the first embodiment, the following effects can be obtained.

(1) In a synchronous rotor 1 for a rotating electrical machine comprising a cylindrical rotor core 2 formed by laminating a plurality of arc-shaped core plates 2a, and a permanent magnet 3 embedded in the rotor core 2.
Provided on the inner peripheral side of the rotor core 2 is a joint (welded joint 11) that joins a plurality of arc-shaped core plates 2a stacked in the rotor axis Ax direction,
The arc-shaped core plate 2a cuts both ends 2PE and 2PE of the inner peripheral surface 2IP of the core plate 2a avoiding the magnet hole 3a opened on the outer peripheral side of the plate and the portion serving as the joint (welded joint 11). And a cutout portion 6 that is lacking.
For this reason, the centrifugal strength reliability of the rotor core 2 can be improved during the rotation of the rotor.

(2) The arc-shaped core plate 2a has a welded portion 5 formed at the inner peripheral edge of the plate,
The joint (weld joint 11) is a weld joint formed by welding and joining linear continuous welds 10 continuously formed by welds 5 between a plurality of core plates 2a stacked in the rotor axial direction. Part 11;
The notch 6 has a region A from the offset position 2FS offset from the welded portion 5 to the circumferential end surface side of the core plate 2a to the end surface 2EF of the core plate 2a in the outer diameter direction from the inner peripheral surface 2IP of the core plate 2a. The depth of PD was set to a notched shape.
For this reason, in addition to the effect of the above (1), the deformation due to the centrifugal force in the outer diameter direction of the both end portions 2PE, 2PE of the core plate 2a can be suppressed to a small level when the rotor rotates.

Example 2 is a modification of the notch 6. Based on FIG. 7, the configuration of the main part of the second embodiment will be described below.

As shown in FIG. 7, the notch 6 has a shape (shape of the notch 6) in which the notch depth in the outer diameter direction gradually increases from the offset position 2FS toward the end surface 2EF of the core plate 2a. Is set.
The shape of the notch 6 is a curved surface as shown in FIG. 7 is not limited to the curved shape as shown in FIG. 7, and may be a curved shape different from that shown in FIG. 7 or a linear shape as shown in FIG. In short, this shape should just be set to the shape which the notch depth to an outer-diameter direction becomes deep gradually as it goes to the end surface 2EF of the core plate 2a from the offset position 2FS.
Since other configurations are the same as those of the first embodiment, the corresponding components are denoted by the same reference numerals and description thereof is omitted.

Next, “the action of the notch shape” in the synchronous rotor 1 for the rotating electrical machine according to the second embodiment will be described with reference to FIG.

Generally, in a region having a cantilever structure, when the rotor rotates, deformation due to centrifugal force in the outer diameter direction increases toward the end surface of the core plate.

On the other hand, in Example 2, as shown in FIG. 7, the notch depth in the outer diameter direction gradually increases as the notch 6 moves from the offset position 2FS toward the end surface 2EF of the core plate 2a. The setting configuration was adopted for the shape (the shape of the notch 6).
That is, in the region B having the cantilever structure, the mass reduction of the core plate 2a increases as it goes toward the end surface 2EF of the core plate 2a.
Thereby, at the time of rotor rotation, centrifugal force is effectively reduced as it goes from the offset position 2FS toward the end surface 2EF of the core plate 2a as compared with the case where the shape of the notch 6 is not set.
Therefore, when the rotor is rotated, deformation due to the centrifugal force in the outer diameter direction can be effectively suppressed toward the end surface 2EF of the core plate 2a.
In addition, since only the action of the shape of the notch portion 6 of the first embodiment and the second embodiment is different, the other actions are the same as those of the first embodiment, and thus description thereof is omitted.

Next, the effect will be described.
In the rotating electrical machine synchronous rotor 1 of the second embodiment, in addition to the effect (2) of the first embodiment, the following effects can be obtained.

(3) The notch portion 6 was set to have a shape in which the notch depth in the outer diameter direction gradually increased from the offset position 2FS toward the end surface 2EF of the core plate 2a.
For this reason, at the time of rotor rotation, the deformation | transformation by the centrifugal force to an outer-diameter direction can be effectively suppressed as it goes to the end surface 2EF of the core plate 2a.

Example 3 is a modification of the core plate 2 a, the welded part 5, and the cutout part 6. Based on FIG. 10, the configuration of the main part of the third embodiment will be described below.

As shown in FIG. 10, the arc-shaped core plate 2a is formed by an outer peripheral side arc 21a as an outer periphery thereof and an offset arc 22 as an inner periphery thereof.

The outer peripheral arc 21a is an arc centered on the center point O1 (reference center point) of the core plate 2a as shown in FIG. The center point O1 is the same as the center point O of the first embodiment.

The offset arc 22 will be described as follows with reference to FIG.
First, a core plate formed of a concentric outer circumferential arc 21a and inner circumferential arc 21b (a chain line in FIG. 10) centered on the center point O1 is defined as a reference core plate 21. As shown in FIG. 10, the radius of the outer circumferential arc 21a is the reference outer radius R1, and the radius of the inner arc 21b is the reference inner radius R2.
Next, a center point O1 is placed on an extension line EL that extends a straight line L1 (dashed line) connecting the center point O1 and the center point 21b1 (circumferential center) of the inner circular arc 21b beyond the center point O1. The center point offset from is set as the offset center point O2.
Subsequently, a straight line L2 (dashed line) connecting the offset center point O2 and the circumferential center point 21b1 of the inner circumference side arc 21b is set as an offset radius R3 (radius) from the circumferential center point 21b1 of the inner circumference side arc 21b to the reference core. An arc extending in the circumferential direction up to both end faces 21 EF of the plate 21 is defined as an offset arc 22.
Here, the radius of curvature of the offset arc 22 is larger than the radius of curvature of the inner circumference side arc 21b, and the offset arc 22 has an end face of the core plate 2a from the circumferential center point 21b1 of the inner circumference side arc 21b rather than the inner circumference side arc 21b. As it goes to 2EF, it approaches the outer circumferential arc 21a.

The welding part 5 is demonstrated as follows using FIG. 4 and FIG.
Also in the third embodiment, as described in the rotor core assembling process of the first embodiment, as shown in FIG. 4, an angle is formed on the first layer core plate 2 a with respect to the first layer core plate 2 a in the rotation direction of the rotor core 2. The second core plate 2b is stacked with a shift of θ2.
At this time, if the four welded parts 5 having the same shape are formed on the core plate 2a of the third embodiment as in the first embodiment, the core plate 2a of the third embodiment is formed by the outer circumferential arc 21a and the offset arc 22 Since the center points O1 and O2 are different, the welded portion 5 between the first layer core plate 2a and the second layer core plate 2b does not match in the rotor axis Ax direction.
For this reason, the welding part 5 of Example 3 makes the arrangement | positioning and shape of the welding part 5CE of the circumferential direction center side of the core plate 2a and the welding part 5EF of the circumferential direction end surface side different.
That is, when the second layer core plate 2b is laminated with the angle θ2 shifted in the rotation direction of the rotor core 2 with respect to the first layer core plate 2a, the welded portion between the first layer core plate 2a and the second layer core plate 2b The convex portions 5b of the core plate 2a are formed at positions where the convex portions 5b coincide with each other in the rotor axis Ax direction.
In other words, as shown in FIG. 10, the circumferential direction of the core plate 2 a is formed such that a continuous linear welded portion 10 is formed by the welded portions 5 between the plurality of core plates 2 a stacked in the rotor axis Ax direction. The convex portions 5b on the center side and the circumferential end surface side are arranged at different positions.
In addition, the shape of the convex part 5b is formed in the triangle shape similarly to Example 1 (refer FIG. 2 of Example 1).

The concave surface 5a of the welded portion 5 is formed in accordance with the convex portions 5b on the circumferential end surface side and the circumferential central side of the core plate 2a. That is, as shown in FIG. 10, the concave surface 5a is formed so as to be deeply recessed in the outer diameter direction from the inner peripheral surface 2IP of the core plate 2a on the central side in the circumferential direction rather than the end surface side in the circumferential direction of the core plate 2a. Yes. The shapes of these concave surfaces 5a are formed into curved shapes having different depths (see FIG. 2 of Example 1).

As shown in FIG. 10, the notch 6 is set in a shape (shape of the notch 6) cut from the reference core plate 21 in the outer diameter direction from the inner circumferential arc 21 b to the offset arc 22. The shape of the notch 6 is set to a shape in which the notch depth in the outer diameter direction is gradually increased from the offset position 2FS toward the end surface 2EF of the core plate 2a.
Here, the center between the circumferential center point 21a1 (circumferential center) of the outer circumferential arc 21a and the circumferential center point 22a (circumferential center) of the offset arc 22 (= the circumferential central point 21b1 of the inner circumferential arc 21b). The end face yoke width W2 between the outer peripheral arc 21a and the offset arc 22 on the end face 2EF of the core plate 2a is smaller than the yoke width W1.
Since other configurations are the same as those of the first embodiment, the corresponding components are denoted by the same reference numerals and description thereof is omitted.

Next, “the action of the notch shape” in the synchronous rotor 1 for the rotating electrical machine according to the third embodiment will be described with reference to FIG.

On the other hand, in the third embodiment, as shown in FIG. 10, the cutout portion 6 is cut out from the reference core plate 21 from the inner circumferential side arc 21 b to the offset arc 22 in the outer diameter direction (the cutout portion 6 of the cutout portion 6. The configuration set to (shape) was adopted.
That is, in the region B having a cantilever structure, the mass reduction of the core plate increases from the offset position 2FS toward the end surface 2EF of the core plate 2a.
Thereby, at the time of rotor rotation, centrifugal force is effectively reduced as it goes from the offset position 2FS toward the end surface 2EF of the core plate 2a as compared with the case where the shape of the notch 6 is not set.
Therefore, when the rotor is rotated, deformation due to the centrifugal force in the outer diameter direction can be effectively suppressed toward the end surface 2EF of the core plate 2a.
In addition, since only the action of the shape of the notch portion 6 of the first embodiment and the third embodiment is different, the other actions are the same as those of the first embodiment, and thus the description thereof is omitted.

Next, the effect will be described.
In the rotating electrical machine synchronous rotor 1 of the third embodiment, in addition to the effect of the first embodiment (1), the following effects can be obtained.

(4) A core plate formed of an outer peripheral arc 21a and an inner arc 21b that are concentric with the reference center point (center O1) as the center is defined as a reference core plate 21.
On the extension line EL that extends a straight line L connecting the center in the circumferential direction (circumferential center point 21b1) and the reference center point (center point O1) of the inner circular arc 21b beyond the reference center point (center point O1), The center point offset from the reference center point (center point O1) is defined as the offset center point O2,
From the circumferential center (circumferential center point 21b1) of the inner circumferential arc 21b, with a straight line connecting the offset center point O2 and the circumferential center (circumferential center point 21b1) of the inner circumferential arc 21b as a radius (offset radius R3). When an arc extending in the circumferential direction up to both end faces 21EF of the reference core plate 21 is an offset arc 22,
The cutout portion 6 was set to have a shape cut out from the reference core plate 21 in the outer diameter direction from the inner circumference side arc 21 b to the offset arc 22.
For this reason, at the time of rotor rotation, the deformation | transformation by the centrifugal force to an outer-diameter direction can be effectively suppressed as it goes to the end surface 2EF of the core plate 2a.

As described above, the synchronous rotor for a rotating electrical machine according to the present invention has been described based on the first to third embodiments, but the specific configuration is not limited to these embodiments, and each claim of the claims Design changes and additions are permitted without departing from the spirit of the invention.

Examples 1 to 3 show an example in which four magnet holes 3a and four welds 5 are formed at equal intervals in the configuration of one core plate 2a. However, the configuration of one core plate 2a is not limited to the configurations shown in the first to third embodiments. For example, each of the magnet holes 3a and the welded portions 5 only needs to be formed at equal intervals, and may be formed in less or more than four.

Examples 1 to 3 show an example in which the number of core plates 2a constituting each layer is three. However, the number of core plates 2a constituting each layer is not limited to the configuration shown in the first to third embodiments. For example, the number of core plates 2a constituting each layer may be less or more than three. However, when the number of core plates 2a constituting each layer is changed, the angle θ1 and the angle θ2 of the arc are changed according to the number of core plates 2a constituting each layer.

In Examples 1 to 3, an example in which the angle θ2 is set to 30 ° and shifted counterclockwise is shown. However, the angle θ2 is not limited to the configuration shown in the first to third embodiments. In other words, the next layer may be laminated so as to straddle the joint between the core plates 2a of the previous layer, and therefore the angle does not have to be 30 °. Moreover, although it shifted counterclockwise, you may shift clockwise.

In Examples 1 to 3, an example is shown in which the shape of the magnet hole 3a is formed in a rectangular shape spreading in the circumferential direction, and the number thereof is one on the same axis of the radial axis CL. However, the shape and number of the magnet holes 3a are not limited to the configurations shown in the first to third embodiments. For example, the shape may be an elliptical shape, a rhombus shape, a trapezoidal shape, or the like, and the number thereof may be two or more holes per one radial axis CL.

In Examples 1 to 3, an example is shown in which the concave surface 5a of the welded portion 5 is formed into a curved surface, and the shape of the convex portion 5b is formed into a triangular shape. However, the shapes of the concave surface 5a and the convex portion 5b of the welded portion 5 are not limited to the configurations shown in the first to third embodiments. For example, the concave surface 5a may be a flat surface or a shape that combines a curved surface and a flat surface. Moreover, the convex part 5b may be circular, elliptical, rectangular, rhombus or trapezoidal.

Examples 1 to 3 show an example in which the region B from the weld joint 11 (joint portion) to the end 2PE of the core plate 2a is cantilevered by welding. However, the configuration is not limited to those shown in the first to third embodiments. For example, a caulking structure may be employed to form a coupling portion, and the region B from the coupling portion to the end 2PE of the core plate 2a may be a cantilever structure. In short, if the region B from the coupling portion to the end 2PE of the core plate 2a has a cantilever structure, the coupling portion is not limited to welding or caulking.

In Examples 1 to 3, the rotor shaft 4 is press-fitted into the rotor core 2 so that the rotor shaft 4 is fitted to the rotor core 2. However, the configuration is not limited to those shown in the first to third embodiments. For example, general key engagement may be used in addition to press-fitting. That is, one or several key grooves may be formed on the inner peripheral surface 2IP of the rotor core 2 and the outer peripheral surface of the rotor shaft 4, and a key may be inserted into the key groove to prevent rotation. In addition, when the rotor core 2 is formed of a plurality of core plates 2a, it is preferable to prevent rotation by key engagement rather than press-fitting.

Claims

In a synchronous rotor for a rotating electrical machine comprising a cylindrical rotor core formed by stacking a plurality of arc-shaped core plates, and a permanent magnet embedded in the rotor core,
Provided on the inner peripheral side of the rotor core is a coupling portion that couples the plurality of arc-shaped core plates stacked in the rotor axial direction;
The arc-shaped core plate has a magnet hole opened on the outer peripheral side of the plate, and a notch formed by notching both end portions of the inner peripheral surface of the core plate avoiding a portion to be the coupling portion. A synchronous rotor for a rotating electrical machine.
In the synchronous rotor for a rotating electrical machine according to claim 1,
The arc-shaped core plate has a weld formed at the inner peripheral edge of the plate,
The joint is a weld joint formed by welding and joining a linear continuous weld formed continuously by the weld between the plurality of core plates stacked in the rotor axial direction.
The notch cuts a region from an offset position offset from the welded portion toward the circumferential end surface of the core plate to an end surface of the core plate by a predetermined depth from the inner circumferential surface of the core plate in the outer diameter direction. A synchronous rotor for a rotating electrical machine, characterized in that it is set in a missing shape.
In the synchronous rotor for a rotating electrical machine according to claim 2,
The synchronous rotor for a rotating electrical machine, wherein the cutout portion is set to have a shape in which a cutout depth in an outer diameter direction is gradually increased from the offset position toward an end surface of the core plate.
In the synchronous rotor for a rotating electrical machine according to claim 1,
A core plate formed from a concentric outer circumferential arc and inner circumferential arc centered on a reference center point is defined as a reference core plate.
A straight line connecting the center in the circumferential direction of the inner circumference side arc and the reference center point is an extension line extending beyond the reference center point, and a center point offset from the reference center point is set as an offset center point.
An arc extending in the circumferential direction from the circumferential center of the inner circumferential arc to both end faces of the reference core plate is defined as an offset arc with a straight line connecting the offset center point and the circumferential center of the inner circumferential arc as a radius. and when,
The synchronous rotor for a rotating electrical machine, wherein the cutout portion is set in a shape cutout in an outer diameter direction from the inner circumference side arc to the offset arc from the reference core plate.