JP3415359B2 - Rotating electric machine rotor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor of a rotary electric machine, and more particularly to a salient pole type rotor used in a large turbine generator, in which a braking winding is provided near the head of the salient pole portion , that is, in the vicinity of the outer circumference. The present invention relates to a rotor of a rotating electric machine including a wire.

[0002]

2. Description of the Related Art A rotary electric machine generally used in the past is
The rotor shape is roughly classified into the following two categories . That is, there are salient-pole type rotating electric machines in which magnetic poles are installed so as to project from the rotating shaft as in a turbine generator, and cylindrical rotating electric machines in which magnetic poles do not project toward the rotating shaft as in a turbine generator. being classified.

A rotor of a salient-pole type rotary electric machine is provided with a rotor rim on a rotor shaft, and a plurality of magnetic poles are attached to the outer periphery of the rotor rim at predetermined intervals in the circumferential direction. A plurality of braking windings are attached to each magnetic pole head so as to extend in the axial direction.
This braking winding has its end electrically connected by a short-circuit piece, and generates a braking torque if the rotation speed becomes unstable due to a sudden change in load during operation, and It works to stabilize the speed.

The short-circuit piece for short-circuiting the ends of the braking winding is
As shown in Figure 5, normally, while being firmly fixed to the pole 1, the circumferential end portion, i.e., end coupled to the short-circuit piece 5 of the adjacent magnetic poles short-circuit piece 5 The connecting piece 7 is applied so as to be sandwiched, and is fixed by tightening with a bolt 8. Further, in a rotating electric machine of large capacity and high speed, this short-circuit piece connecting portion must be robustly supported against centrifugal force during rotation, and normally , a supporting member extending in the radial direction from the rotor rim side, that is, a supporting member . Bolt 9
It is structured to be supported via.

Examples of the rotor of this type of rotary electric machine include JP-A-49-61601 and JP-A-5-252705.

[0006]

A salient-pole type rotor having a braking winding and a short-circuit piece connecting portion is used in the case of a rotary electric machine of a small or medium capacity, and is simply bolted to each other to prevent centrifugal force during rotation. However, the centrifugal force acting on the equipment is considerably large in the equipment that rotates at high speed due to the increase in the capacity of equipment due to the recent increase in power demand. Some kind of support is required, such as support with support bolts extending in the direction.

[0007] The structure that is supported by the support bolt extending in the radial direction from the rotor rim side, which has been generally adopted in the past, is certainly a solid support, but this structure has been operated for many years. However, due to this support structure, the short-circuit piece connection portion may be adversely affected and the operation of the rotary electric machine may be hindered. That is, for example, as shown in FIG. 6, when the magnetic pole and the short-circuiting piece are displaced by Δ k in the radial direction based on the rotation of the rotor, a force that expands in the circumferential direction acts on the short-circuiting piece connecting portion. To do.

However, in this structure, since the center portion of the short-circuit piece connecting portion is supported by the support bolt that supports the rotor rim as described above, movement between the short-circuit piece connecting portion and the short-circuit piece is prevented. Relative displacement may occur, the connecting piece may be deformed in the edgewise direction (width direction) to generate a crack, and eventually may be broken to cause scattering and hinder the operation of the rotating electric machine.

The present invention has been made in view of the above, and it is an object of the present invention to deform, crack, or break the connecting piece due to centrifugal force even in a large-capacity machine and a high-speed rotating electric machine. It is to provide the rotor of this kind of rotating electric machine which is never.

[0010]

That is, the present invention provides a plurality of magnetic poles mounted at intervals in the circumferential direction, a plurality of braking windings provided on the magnetic pole head, and a plurality of the braking windings. In a rotor of a rotary electric machine comprising a short-circuit piece for electrically short-circuiting the end portions of each other and a connection piece for connecting between adjacent short-circuit pieces, the connection piece is supported between the adjacent short-circuit pieces. The supporting member is interposed, and the supporting member is hung and supported on the short-circuit piece so as to be slidable in the circumferential direction, thereby achieving the intended purpose.

Further, when the supporting member is hooked and supported by the short-circuiting piece, a protrusion protruding in the circumferential direction is provided on the supporting member, and the protruding portion is slidably hooked on and supported by the inner peripheral side surface of the short-circuiting piece. It is the one.

Further, a plurality of magnetic poles mounted at intervals in the circumferential direction, a plurality of braking windings provided at the heads of the respective magnetic poles, and end portions of the plurality of braking windings are electrically connected to each other. In a rotor of a rotating electric machine comprising a short-circuit piece short-circuited to and a connecting piece connecting between the short-circuit pieces provided in each magnetic pole, the short-circuit piece is projected in the width direction on the outer periphery of the end of the short-circuit piece. The protrusion is provided, and the connecting piece is hooked on the protrusion.

That is, in the rotor of the rotary electric machine having the above-described structure, the supporting member supports the connecting piece with the short-circuiting piece serving as the support base, so that the relative displacement of the short-circuiting piece and the connecting piece in the radial direction. Therefore, it is possible to prevent cracks and the like caused by deformation of the connecting piece.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail based on the embodiments shown in the drawings. FIG. 1 shows the rotor of the rotating electric machine. This figure is a view of the rotor of the salient pole type rotary electric machine as viewed from the axial direction. The field pole 1 is inserted into a magnetic pole core 1a, which is formed by punching out thin steel plates, a field winding 1b wound around the core, and a groove formed in the head of the field pole 1 in the axial direction. The plurality of braking windings 4 are formed, and the short-circuit piece 5 for electrically connecting the ends of the plurality of braking windings 4 is formed.

The end of the braking winding 4 and the short-circuit piece 5 are
The end portion of the braking winding 4 is inserted into the hole machined in and is fixed by brazing. The field magnetic pole 1 is fixedly held on the rotor rim 3. That is, the rotor rim 3 is provided with a groove processed into a dovetail shape at a predetermined interval in the rotation direction, and the dovetail-shaped projection provided on the bottom of the field pole 1 is fitted into this groove. The field pole 1 is fixedly held on the rotor rim 3.

2 and 3 show the details of the connecting portion A of the short-circuit piece 5 of FIG. 1, and between the short-circuit pieces 5 connected between the adjacent field poles 1, A T-shaped support member 6 is arranged. In this case, the support member 6 is inserted so as to come into contact with the short-circuit piece 5 on the inner diameter side surface , that is, the B surface in the figure, and the connecting portion of the short-circuit piece 5 is sandwiched by the flexible connection pieces 7 from both side surfaces thereof and tightened. The structure is such that it is tightened with attached bolts 8.

The flexible connecting piece 7 is formed by laminating copper thin pieces in the thickness direction, and has a wave-like flexible shape as shown in FIGS. 2 and 3, and has centrifugal force and heat during rotation. It is formed so as to absorb the displacement in the circumferential direction represented by elongation.

Consider the case where the rotor rotates in the salient pole type rotating electric machine having the above structure. In a high-speed, large-capacity machine, a large centrifugal force acts as the rotor rotates, which pushes the field pole 1 outward in the radial direction. At the same time, the short-circuit piece 5 also receives the action of centrifugal force,
As shown in FIG. 7, it is displaced in the radial direction by Δk in the order of several mm. Therefore, the connecting portion of the short-circuit piece 5 is displaced due to the force to spread it.

The displacement Δg caused by the force of expanding in the circumferential direction is absorbed by the end of the short-circuit piece 5 sliding on the contact surface B with the support member 6 and the flexible connecting piece 7 expanding. It At this time, the flexible connecting piece 7 is in close contact with the supporting member 6, and the supporting member 6 uses the contact surface B with the short-circuiting piece 5 as a supporting surface and moves simultaneously with the short-circuiting piece 5 in the centrifugal force direction. There is no relative displacement between the member 6 (flexible connection piece 7) and the short-circuit piece 5, and the flexible connection piece 7 is not deformed.

The above is the embodiment in which the supporting member 6 is used, but as another embodiment, as shown in FIG.
A structure may be provided in which a convex portion protruding in the width direction of the short-circuit piece is provided on the outer periphery of the end of the short-circuit piece, and the flexible connection piece is hooked on the convex portion.

As described above, in the rotor of the rotating electric machine formed in this way, even when the connecting portion of the short-circuit piece is displaced in the radial direction by the centrifugal force during high-speed rotation, the support member and the short-circuit piece are formed. Since the relative displacement between and is eliminated and the cracks in the connecting piece are eliminated, the reliability of the product can be improved.

[0022]

As described above, according to the present invention, even in a large-capacity and high-speed rotating electric machine, the connecting piece is not deformed by the centrifugal force and the connecting piece is not cracked. A rotor of this type of rotating electric machine can be obtained.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a rotor of a rotary electric machine according to the present invention.

FIG. 2 is a front view showing an enlarged part A of FIG.

FIG. 3 is a plan view of FIG.

FIG. 4 is a perspective view of an essential part showing another embodiment of the rotor of the rotating electric machine of the present invention.

FIG. 5 is a front view showing a main part of a rotor of a conventional rotary electric machine.

FIG. 6 is an explanatory diagram showing a displacement situation of a conventional short-circuit piece connecting portion.

FIG. 7 is an explanatory view showing a displacement situation of the short-circuit piece connecting portion of the present invention.

[Explanation of symbols]

1 ... field magnetic pole, 1a ... magnetic pole core, 1b ... field winding, 3 ...
Rotor rim, 4 ... Damping winding, 5 ... Short-circuit piece, 6 ... Support member, 7 ... Flexible connection piece, 8 ... Tightening bolt, 9 ... Support bolt.

Front Page Continuation (72) Inventor Keiji Suzuki 3-1-1, Sachimachi, Hitachi City, Ibaraki Hitachi Co., Ltd. Hitachi Factory (56) Bibliographic references Sho 49-61601 (JP, U) Sho 63 −127253 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H02K 3/20 H02K 3/52

Claims (3)

(57) [Claims] 1. A plurality of magnetic poles mounted on a rotor rim at intervals in the circumferential direction, a plurality of braking windings provided on the respective magnetic pole heads, and a plurality of the braking windings. In a rotor of a rotary electric machine comprising a short-circuit piece for electrically short-circuiting the ends of a wire, and a flexible connection piece for connecting between the short-circuit pieces provided on the magnetic poles, the adjacent short-circuit pieces Between the opposite ends of the rotary
Independent from the
Be those obtained by interposing a support member which is not connected, the <br/> supporting protrusion member protrudes circumferentially disposed slidably was hooked to the protrusion on the inner peripheral side surface of the short piece A rotor of a rotating electric machine characterized by the above. 2. A plurality of magnetic poles mounted on a rotor rim at intervals in the circumferential direction, a plurality of braking windings provided on the heads of the respective magnetic poles, and a plurality of the braking windings. In a rotor of a rotary electric machine comprising a short-circuit piece for electrically short-circuiting the ends of a wire, and a flexible connection piece for connecting between the short-circuit pieces provided on the magnetic poles, the adjacent short-circuit pieces Between the opposite ends of the rotary
Independent from the
Be those obtained by interposing a support member which is not connected, the <br/> the support member is formed in T-shape, is interposed a vertical bar portion of the T-shape between the opposite ends of the short bar, and the horizontal bar portion the rotor of the rotating electric machine, characterized in that slidably was hooked on the inner peripheral surface of the short piece. 3. A plurality of magnetic poles mounted on a rotor rim at intervals in the circumferential direction, a plurality of braking windings provided on the heads of the respective magnetic poles, and a plurality of the braking windings. a jumper for electrically short-circuiting ends comrades lines, in a rotor of a rotating electric machine provided with a flexible connecting piece for connecting the jumper provided in each pole, an end periphery of the short piece A rotor of a rotary electric machine, characterized in that a convex portion projecting in the width direction of the short-circuit piece is provided on this, and the connecting piece is hooked on this convex portion.