JPH0767281A - Rotor for electric rotating machine - Google Patents

Abstract

PURPOSE:To facilitate fitting and removal of slot wedge for retaining a rotor winding being placed in a rotor slot by setting the distance, between the supporting position of a bind for holding the rotor winding at an end part thereof and the end part of core, longer than the basic length of the slot wedge thereby preventing the slot wedge from abutting on the bind. CONSTITUTION:A slot wedge 14 made of a nonmagnetic metal is fitted to the outer peripheral part of a core slot 13 so that a rotor winding 12 is not scattered upon rotation of a rotor. A bind 17 is also wound around the end part 16 of winding projecting outward in the direction of rotary shaft from the rotor core end part 15 in order to bear the centrifugal force acting thereon. The distance L between the bind 17 and the core end 15 is set longer than the length of the slot wedge 14. Since the slot wedge 14 can be fitted to and removed from the core slot 13 and can be replaced without removing the bind 17, workability of periodic inspection and maintainability of the rotor can be enhanced.

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 wire-wound rotary electric machine.

[0002]

2. Description of the Related Art The structure of a rotor winding end portion of a wound type rotary electric machine will be described with reference to FIGS. FIG. 4 is a sectional view showing a conventional rotor winding end portion, and FIG. 5 is a front view in the direction of arrow B in FIG. In addition, FIG. 6 shows AA of FIG.
It is a partial cutaway sectional view by a line.

As shown in FIG. 4, a rotor core 11 forming a rotor of a rotary electric machine has a rotor upper winding 12A and a rotor lower winding 12B formed in the rotor axial direction, that is, in the arrow C direction. A rotor winding 12 consisting of This rotor winding 12
A and 12B are housed in an iron core slot 13 provided on the outer peripheral portion of the rotor iron core 11. In addition, the outer peripheral portion of the iron core slot 13 is provided by the centrifugal force generated when the rotor is rotated.
Slot wedges 14 are inserted to prevent the windings 12 housed in 13 from scattering.

The centrifugal force also acts on the winding end 16 projecting axially outside from the rotor core end 15. Therefore, the bind 17 is wound around the outer circumference of the winding 16 of the rotor core end portion 15, and the cylindrical ring 18 is arranged inside the rotor core end portion 15 as a part of the rotating shaft to support the rotor core end portion 15 here. To do. Since the centrifugal force depends on the weight of the rotor winding end portion 16 and the number of rotations of the rotor, the material and the number of windings of the bind 17 are determined according to the centrifugal force. As the material, glass tape, non-magnetic metal wire or the like is used. Also bind 17, rotor winding
16, an insulator 19 is provided between the cylindrical rings 18.
In FIG. 5, the slot wedge 14 is divided into a length of, for example, 100 to 250 mm in the axial direction of the rotor core 11 in order to facilitate the charging work and to receive a strong rotational force.

[0005]

However, it is necessary to attach / detach the slot wedge 14 to / from the iron core slot 13 due to looseness, scratches, damage, etc., which occur in the slot wedge 14 during maintenance / inspection or operation of the rotary electric machine. In this case, the slot wedge
14 will be removed by shifting it toward the end 15 of the core, but the outer diameter φD of the bind wound around the outer circumference at the end of the winding
Is larger than the inner diameter φD of the slot wedge, the offset slot wedge 14 hits the bind 17, and it is not easy to attach and detach the slot wedge 14 from the iron core slot 13. That is,
In particular, the distance L between the iron core end 15 and the binding is determined by the slot wedge 14
If the length is smaller than 1, the binding 17 wound around the outer circumference of the rotor winding end 16 must be removed in order to remove the slot 14 from the iron core slot 13. After the adjustment, repair, and replacement of the slot wedge 14, the binding 17 is wound again using special equipment or a jig, so that there is a drawback that the number of working days becomes long. In view of the above drawbacks, an object of the present invention is to provide a rotor of a rotary electric machine with improved workability and maintainability during regular inspection.

[0006]

A rotor of a rotating electric machine according to the present invention has a basic length of a slot wedge for accommodating a distance between a support position of a bind holding an end portion of a rotor winding and an end portion of an iron core in a rotor slot. It is characterized by making it larger than Sa. Further, it is characterized in that the outer diameter including the binding for supporting the rotor winding is shorter than the length having the position where the slot wedge is mounted as the outer diameter.

[0007]

Since the rotor of the rotating electric machine of the present invention is constructed so as not to come into contact with the bind when the slot wedge is attached and detached, the detachability of the slot wedge supporting the rotor winding accommodated in the rotor is improved. Therefore, workability and maintainability at the time of periodic inspection of the rotor can be improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a sectional view showing an end portion of a winding type rotor winding. The rotor of the cylindrical rotating electric machine has a rotor core 11 formed around the rotating shaft. A rotor winding 12 including a rotor upper winding 12A and a rotor lower winding 12B formed in the rotor axial direction, that is, the arrow C direction is provided. This rotor winding 12
A and 12B are housed in an iron core slot 13 provided on the outer peripheral portion of the rotor iron core 11. Further, a slot wedge 14 made of a non-magnetic metal is inserted in the outer peripheral portion of the iron core slot 13 so as to support the rotor winding 12 so as not to be scattered by the rotation of the rotor. .

In order to support the centrifugal force acting on the winding end 16 protruding from the rotor core end 15 to the outside in the rotation axis direction, the binding 17 is attached to the outer periphery of the winding end 16 of the rotor core end 15. It is wound and also wound around the inner cylindrical ring 18. The material and the number of windings of the bind 17 are determined by the weight of the rotor winding end 16 and the magnitude of the centrifugal force generated by the number of rotations of the rotor. As the material, glass tape, non-magnetic metal wire or the like is used. An insulator 19 is provided between the bind 17, the rotor winding 16, and the cylindrical ring 18.

The slot wedge 14 is composed of the slot wedges 14 divided into a length of 100 to 250 mm in the axial direction of the rotor core 11 in order to facilitate the charging operation and to receive the centrifugal force due to the strong rotation. Has been done. Here, in the present invention, the distance L between the bind 17 and the rotor core end 15 is set to a value larger than the length l of the slot wedge 14.

Therefore, the slot wedge 14 can be attached to and detached from the iron core slot 13 without removing the bind 17. As described above, according to this embodiment, the slot wedge 14 can be attached to and detached from the iron core slot 13 and replaced without removing the binding wound around the outer circumference of the rotor winding 16. Therefore, workability at the time of regular inspection of the rotor,
Maintainability can be improved.

Next, FIG. 2 shows another embodiment, which is an insulator having a thickness such that the relationship φD <φd is established between the outer diameter φD of the bind 17 and the inner diameter φd of the slot wedge 14. The spacer 21 is inserted between the rotor coil 12 and the slot wedge 14 in the iron core slot 13.

Further, FIG. 3 shows that the winding portion protruding from the rotor core end portion 15 to the outer periphery so that the relational expression φD <φd is established between the outer diameter φD of the bind 17 and the inner diameter φd of the slot wedge 14. It is sectional drawing which shows the Example which bent 16 A to the radial inside.

Even with this configuration, the slot wedge 14 can be attached to and detached from the iron core slot 13 and replaced without removing the bind 17, so that the same effect as the embodiment of FIG. 1 can be obtained. .

[0015]

As described above, according to the present invention, the slot wedge can be attached / detached to / from the iron core slot without removing the binding, thereby improving workability and maintainability during inspection. It is possible to provide the rotor of the rotating electric machine.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a rotor winding end portion that is an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of a rotor winding end portion showing another embodiment of the present invention.

FIG. 3 is a partial cross-sectional view of a rotor winding end portion showing another embodiment of the present invention.

FIG. 4 is a sectional view of a conventional rotor winding end portion.

5 is a plan view seen from the arrow B direction in FIG. 4;

6 is a cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

 11 ... Rotor iron core 12 ... Rotor winding 12A ... Rotor winding (upper winding) 12B ... Rotor winding (lower winding) 13 ... Iron core slot 14 ... Slot wedge 15 ... Iron core end 16 ... Winding end 16A ... Winding end 17 ... Bind 18 ... Cylindrical ring 19 ... Insulator 20 ... Air duct 21 ... Spacer

Claims (2)

[Claims] 1. A rotor of a rotating electric machine, wherein a supporting position of a bind holding an end portion of the rotor winding is set to be larger than a basic length of a slot wedge accommodated in the rotor slot. Child. 2. The outer diameter of the winding end portion including the binding for holding the rotor winding with respect to the rotating shaft is made smaller than the outer diameter of the winding central portion in which the slot wedge is mounted. Rotor of rotating electric machine.