JPH0529253U - Rotating machine rotor - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a rotor that can prevent stress concentration in the support ring and prevent deterioration in fatigue strength due to start and stop. [Structure] Between the support ring support 15 and the inner peripheral side of the winding end portion 2, the outer peripheral edge of the supporting ring contacts the radially inner peripheral surface of the winding end portion, and axial movement is blocked. And a supporting ring support 3 having one end fixed to the inner peripheral edge of the supporting ring 14 and the other end abutting the supporting ring support 15 and having a saddle insertion hole 30a formed in the axial direction.
0, a saddle 31 that is inserted into the saddle insertion hole 30a and has a pair of bolt insertion holes 31a, and a curved portion 12a that is inserted from the outer peripheral portion of the winding end portion 2 toward the inner peripheral portion, and its straight end. The U-bolt 1 in which the portion 12b is inserted into the bolt insertion hole of the saddle 31 and the nut 13 is screwed into the protruding end portion
Those equipped with 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rotor of a rotating electric machine, which prevents the winding end portion of the rotor of the rotating electric machine from being deformed by centrifugal force.

[0002]

[Prior Art]

 As a first example of a winding end portion support structure in a rotor of a rotary electric machine that has been conventionally adopted, a description will be given with reference to a partial sectional view shown in FIG. FIG. 4 shows the vicinity of the axial end portion of the rotor. The upper coil 2a and the lower coil 2b project from the axial end portion of the rotor core 1, and both coils 2a and 2b are connected. A supporting member 4 such as an insulating tape or a non-magnetic steel wire for electric machine binding is strongly wound around the outer peripheral surface of the winding end portion 2 with an insulator 3 interposed therebetween. Prevents deformation in the outer peripheral direction. In the figure, 5 is a rotor spoke, 6 is an end plate, and 7 is a rotating shaft.

[0003]

[Problems to be solved by the device]

 In the configuration of FIG. 4, the supporting member 4 needs to be widely wound in multiple layers in order to secure its strength against the increase in the capacity of the rotating electric machine and the increase in the turning radius. As a result, there are problems that the cooling efficiency of the coil 2 and the iron core 1 is lowered, and that there is a model in which it is difficult to secure the strength due to the dimensional constraint on the number of windings.

In order to solve this problem, as a second example of the conventional winding end portion supporting structure, as shown in FIG. 5, a supporting ring support 10, a saddle 11, and a U bolt (U-shaped fastening member). 12, a nut 13, a support ring 14, a support ring in the radial direction consisting of a support ring support 15, and a bolt 20, a nut 21, and an insulator 22 for axial support as shown in FIG. 2 (common to the embodiment of the present invention). Some have a support part.

The radial supporting portions are a plurality of supporting members that are fixed to each other by welding or the like at intervals with respect to the axial end surfaces of the rotor spokes 5 and face the inner peripheral surface of the winding end portions 2. The ring support 15 and the ring-shaped outer peripheral portion of the ring support 15 contact the inner peripheral side of the winding end 2, and the inner peripheral side supports the ring support 15 via the support ring support 10 acting as a reaction force receiver. The support ring 14 that is abutted and has a plurality of saddle insertion holes 14a penetrating in the axial direction in the plate surface, and the support ring 14 are respectively inserted into the saddle insertion holes 14a, and two bolt insertion holes 11a are inserted in each. The formed saddle 11 and the curved portion (R portion) 12a are inserted into the upper coil 2a and the lower coil 2b of the winding end portion 2 via the insulator 18, respectively, and the linear end portion (parallel leg portion) is formed. ) 12b , A U-bolt 12 that is inserted into a bolt insertion hole 11a formed in the saddle 11, and a nut 13 is screwed into a threaded portion 12c formed at this protruding end. The coils 2a and 2b and the support ring 14 are integrated by the initial tightening force of the U bolt 12 and the nut 13.

The axial support portion is configured as shown in FIG. 2 is a partial cross-sectional view of the rotor in a position where the support ring support 15 is not present, unlike the cross-sectional position of FIG. A plurality of bolt holes 14b penetrating in the axial direction are formed in the support ring 14, and the ends of the bolts 20 projecting from the axial end faces of the rotor core 1 are inserted into the bolt holes 14b. A nut 21 is screwed into the portion, and an insulator 22 is arranged on the outer peripheral portion of the bolt 20. The U-bolt 121 arranged in this portion is longer than that provided in FIG. 5, and its straight end 121 b has a saddle that abuts on the inner peripheral portion of the support ring 14. A nut 131 is inserted into the threaded portion 111, and the nut 131 is screwed into the threaded portion 121c of the protruding end portion. As a result, the winding end portion 2 and the U bolt 121 can be deformed in the radial direction but are prevented from moving in the axial direction.

In the case of the conventional support structure for the winding end portion described above, the support ring 14 has a saddle insertion hole (notch portion) for inserting a saddle at a portion where the semi-radial restraint is performed. Since a plurality of 14a are formed, the cross-sectional area of the support ring 14 is reduced, which causes stress to concentrate in the saddle insertion hole 14a, resulting in large fluctuation stress due to start / stop of the rotor. Due to the decrease in fatigue strength due to this stress concentration, there are cases where restrictions are imposed on the adoption of large-capacity machines and high-speed rotating machines. An object of the present invention is to provide a rotor of a rotating electric machine capable of preventing stress concentration on a support ring and preventing deterioration of fatigue strength due to start / stop.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, a rotor of a rotating electric machine according to the present invention has a winding end portion protruding from an axial end portion of a rotor core and connecting end portions of an upper coil and a lower coil, A support ring support formed on the axial end face, and between the support ring support and the inner peripheral side of the winding end, the outer peripheral edge of which is the radial inner peripheral face of the winding end. A support ring that abuts against the support ring, one end of which is fixed to the inner peripheral edge of the support ring, the other end of which abuts the support ring support, and a saddle insertion hole is formed in the axial direction, and the support ring. A saddle that is inserted into the saddle insertion hole of the support and has a pair of bolt insertion holes,

A curved portion is inserted from at least one of the upper coil and the lower coil of the winding end portion from the outer peripheral portion toward the inner peripheral portion, and the linear end portion is inserted into a bolt insertion hole of the saddle. And a U-shaped fastening member that is inserted and fastened.

[0010]

[Action]

 As a result, since it is not necessary to provide a saddle insertion hole in the support ring, stress concentration does not occur and the fatigue strength does not decrease. In addition, a certain area is required to form the saddle insertion hole in the support ring, but this is not necessary either, so the size can be reduced and the weight can be reduced.

[0011]

【Example】

 Hereinafter, embodiments will be described with reference to the drawings. FIG. 1 is a partial cross-sectional view of a winding end support structure according to the present embodiment, which is a cross-sectional view of a position different from a portion where the support ring 14 shown in FIG. 2 is not radially constrained, FIG. 6 is a partial cross-sectional view of the same position as in the conventional example of FIG. 5. Saddle insertion hole 30a for inserting saddle 31 in the axial direction is formed in support ring support 30, which is disposed between support ring support 15 and support ring 14 and abuts them, respectively. Two holes 31a are formed, the bolt insertion hole 31a is inserted into the end of the linear end 12b of the U bolt 12, and the nut 13 is screwed into the threaded portion 12c of this end, whereby the U bolt 12 And the saddle 31 are fastened, and the coils 2a and 2b are formed integrally with the insulator 18, the support ring 14 and the support ring support 30.

In this case, the U-bolt 12 has a length longer than that provided at the cross-sectional position in FIG. The saddle insertion hole 30a formed in the support ring support 30 is formed to be large enough for the saddle 31 to be inserted, as shown in the perspective view of FIG.

In this embodiment having the above-described structure, since the saddle insertion hole is not formed in the support ring 14 and the saddle insertion hole 30a is formed in the support ring support 30, the circumference of the support ring 14 is reduced. Since there is no stress concentration due to the saddle insertion hole in the direction, the stress fluctuation due to the start / stop of the rotor is significantly improved. Further, the stress distribution on the circumference of the support ring 14 becomes constant, and the setting becomes easy. In this way, by reducing the fluctuating stress of the support ring 14, the fatigue strength is greatly improved and the reliability can be enhanced. Further, since the radial dimension of the support ring 14 can be made equal to the cross-sectional area of the conventional method shown in FIG. 5 excluding the cutout portion, the plate width of the support ring 14 is reduced, and the weight of the support ring 14 is reduced. It will be possible to reduce the centrifugal force and the assembly time at the site.

[0014]

[Effect of the device]

 As described above, according to the present invention, the stress concentration of the support ring can be prevented, the fatigue strength can be prevented from lowering due to start / stop, and the size of the support ring can be reduced to reduce the weight. It is possible to provide a rotor of a rotary electric machine that can reduce its own centrifugal force.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing the vicinity of a winding end portion for explaining an embodiment of a rotor of a rotary electric machine according to the present invention.

FIG. 2 is a partial cross-sectional view at a position different from that of FIG. 1 in the vicinity of a winding end portion for explaining an embodiment of a rotor of a rotating electric machine of the present invention.

FIG. 3 is a perspective view showing the relationship between the support ring support and the saddle of FIG.

FIG. 4 is a partial cross-sectional view showing the vicinity of a winding end portion for explaining a first example of a rotor of a conventional rotating electric machine.

FIG. 5 is a partial cross-sectional view showing the vicinity of a winding end portion for explaining a second example of the rotor of the conventional rotating electric machine.

[Explanation of symbols]

1 ... Rotor core, 2 ... Coil, 2a ... Upper coil, 2b ...
Lower coil, 5 ... Rotor spokes, 7 ... Rotating shaft, 12 ... U
Bolt, 12a ... Curved portion, 12b ... Straight end portion, 13 ...
Nut, 14 ... Support ring, 15 ... Support ring support, 2
1 ... Bolt, 22 ... Insulator, 30 ... Support ring support, 30a ... Saddle insertion hole, 31 ... Saddle, 31a ... Bolt insertion hole.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hirokazu Kaneko 1-3-1, Uchisaiwaicho, Chiyoda-ku, Tokyo Within Tokyo Electric Power Company (72) Creator Hiromitsu Yoguchi 2-4, Suehiro-cho, Tsurumi-ku, Yokohama Address inside Toshiba Keihin office

Claims (1)

[Scope of utility model registration request] 1. A winding end portion protruding from an axial end portion of a rotor core and connecting end portions of an upper coil and a lower coil, and a support ring support formed on an axial end surface of the iron core. A support ring between the support ring support and the inner peripheral side of the winding end portion, the outer peripheral edge of which is in contact with the radially inner peripheral surface of the winding end portion, and the inner peripheral edge of the support ring. A support ring support having one end fixed to the support ring support and the other end abutting the support ring support and having a saddle insertion hole formed in the axial direction, and a pair of bolt insertion holes inserted into the saddle insertion hole of the support ring support. A saddle, and a curved portion thereof is inserted from an outer peripheral portion toward an inner peripheral portion in at least one of the upper coil and the lower coil of the winding end portion, and the linear end portion is a bolt insertion hole of the saddle. U-shaped fastening part inserted through and fastened to When the rotor of a rotating electric machine, equipped with a.