JPH04133644A - Abnormality monitor for u-shaped bolt - Google Patents

Abstract

PURPOSE:To detect the elongation deformation and rupture of a rotor coil-end U-shaped bolt during revolution by penetrating and arranging an optical cable in the center hole of a U-shaped bolt and installing the transducing sections of an optical signal and an abnormality decision device. CONSTITUTION:A center hole is formed at the central axis of a u-shaped bolt 5. Optical cables 8 are penetrated into the center holes of all or divided into a plurality of groups of all U-shaped bolts 5 and disposed in series. Optical signals to the optical cables 8 are transmitted through transducing sections 9 from the fixing side of an electric rotary machine, and the optical signals passing through the optical cables 8 are received by the transducing section 9, and input to an abnormality decision device 11 through cables 10. When the U-shaped bolts 5 are elongated and deformed for some reason and further ruptured, the optical cables 8 are damaged and ruptured instantaneously, the optical signals passing in the optical cables 8 are deformed and stopped, and the abnormality of the optical signals is detected by the abnormality decision device 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an abnormality monitoring device for a U-shaped bolt for fixing a rotor coil end of a rotating electric machine.

(Prior Art) A rotor coil end of a rotating electric machine is fixed with a U-shaped bolt. Figure 4 shows a part of the cross section of the coil end fixed with a U-shaped bolt. Moreover, FIG. 5 shows a part seen from the outside. 1 is a rotor core of a rotating electric machine, 2 is a rotor coil stored in a slot in core 1, 3 is a coil end that is part of coil 2 and is not stored in core 1, and 4 is stored in core 1 of coil 2. 5 is a U-shaped bolt that fixes the coil end 3 so that it will not be deformed or displaced by the centrifugal force exerted on the U-shaped bolt 5 while the rotor is rotating. A fixing plate 7 for supporting the U-shaped bolt 5 is an end fixing item attached to the end of the U-shaped bolt 5 in order to cause the centrifugal force acting on the U-shaped bolt 5 to act on the fixing plate 6.

When the rotor of the rotating electrical machine rotates, the coil 2 receives centrifugal force due to the rotation and tends to move in the radial direction.

A portion of the coil 2 housed in the iron core 1 is fixed to the iron core 1 by a wedge 4. Coil end 3 is U-shaped bolt 5
The centrifugal force acting on the coil end 3 is supported by the rotor by the fixing plate 6 via the end fixing member 7 attached to the end of the U-shaped bolt 5.

(Problems to be Solved by the Invention) However, in the past, there was no device for detecting elongation, displacement, or breakage of the U-shaped bolt 5 during rotation of the rotor. Therefore, during rotation, the U-shaped bolt 5
Because they were subjected to excessive loads, they were stretched in the radial direction, deformed, and even had the possibility of breaking. If the rotation continued, the coil end 3 would also be displaced in the radial direction due to the centrifugal force applied to itself, and there was a possibility that the coil end 3 would be destroyed.

An object of the present invention is to provide an abnormality monitoring device that detects elongation deformation or breakage of a U-shaped bolt that fixes a rotor coil end of a rotating electric machine during rotation. The present invention provides a center hole drilled along the central axis of a U-shaped bolt, an optical cable installed through the center hole, and a method for transmitting optical signals to the optical cable and passing through the optical cable. The present invention is characterized by comprising a transmitting/receiving section for receiving the optical signal transmitted by the transmitting/receiving section, and an abnormality determining device for determining an abnormality of the figure-11 bolt based on the optical signal transmitted by the transmitting/receiving section and the optical signal received.

(Function) As a result, if an abnormality such as deformation or breakage of the U-shaped bolt occurs, the optical cable will be damaged and the optical signal flowing there will be stopped or deformed. By detecting an abnormality in the optical signal, an abnormality such as deformation or breakage of the U-shaped pole is detected.

(Example) An embodiment of the present invention will be described below.

FIG. 1 is a block diagram showing a U-shaped bolt abnormality monitoring device according to the present invention. As shown in detail in FIG. 2, a rotor coil 2 is housed in a slot of a rotor core 1 of a rotating body A of a rotating electrical machine.

A coil end 3 at the end of the rotor coil 2 that is not housed in the iron core 1 is fixed with a wedge 4. The U-shaped bolt 5 is used to fix the coil end 3 so that it will not be deformed or displaced by the centrifugal force it receives during rotation of the rotor, and has a central hole in its central axis, as shown in Figure 3. There is. Further, the fixed plate 6 is a fixed plate for supporting the centrifugal force acting on the U-shaped bolt 5 from the rotor. An end fixing device 7 is provided at the end of the U-shaped bolt 5 in order to cause the centrifugal force acting on the U-shaped bolt 5 to act on the fixing plate 6 . The optical cable 8 connects all or all nine U's divided into multiple groups.
They are arranged in series through the center hole of the figure-shaped bolts 5. The optical signal to the optical cable 8 provided through the center hole of the U-shaped bolt 5 is transmitted from the fixed side of the rotating electrical machine via the transmitting/receiving section 9, and the optical signal passing through the optical cable 8 is transmitted to the transmitting/receiving section 9. Receive at. Information on the transmission and reception of the optical signal is then input to the abnormality determination device 1fll via the cable 10.

The part of the rotor coil 2 housed in the iron core 1 is fixed to the iron core 1 by a wedge 4, and the coil end 3 is fixed to the iron core 1 by a U-shaped bolt 5.
is fixed. The centrifugal force acting on the coil end 3 is supported by the rotor by the fixing plate 6 via the end fixing member 7 attached to the end of the U-shaped bolt 5. on the other hand,
The signal output from the abnormality determination device 11 is converted into an optical signal and sent to the optical cable 8 through the cable 10 on the transmitting side and the transmitter/receiver section 9. Since the optical cable 8 is arranged to pass through the center hole of the U-shaped bolt 5, unless the optical cable 8 is damaged or broken, the transmitted optical signal will be passed through the transmitting/receiving section 9 on the receiving side and the cable 10, and an abnormality will be determined. Family [Return to 11.

If the U-shaped bolt 5 is stretched and deformed for some reason and then breaks, the optical cable 8 will be immediately damaged or broken, and the optical signal passing through the optical cable 8 will be deformed or stopped. An abnormality in the optical signal is detected in the abnormality determination group [11]. In this way, an abnormal state of the optical cable 8 can be detected by detecting a change or stoppage of the transmitted/received signal in the abnormality determination device 11.
By detecting the abnormal state of the optical cable 8, the U-shaped pole [
Deformation and breakage due to -5 elongation can be detected.

[Effects of the Invention] As described above, according to the present invention, an optical cable is disposed to pass through the center hole of the U-shaped bolt, and an optical signal is transmitted and received within the optical cable to the abnormality determination device via the transmitting/receiving section and the cable. Therefore, when the U-shaped bolt is deformed due to elongation, an abnormality in the optical signal due to damage or breakage of the optical cable can be easily detected by the abnormality determination device. Therefore, by detecting an abnormality in the optical signal using an abnormality determination device, the rotating electric machine can be stopped immediately, and the centrifugal force of the coil end applied to the U-shaped bolt can be rapidly reduced, thereby preventing deformation or displacement of the coil end. can.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an embodiment of the present invention, FIG. 2 is a side view showing a rotor of a rotating electric machine of the present invention, FIG. 3 is a sectional view of a U-shaped bolt of the present invention, and FIG. FIG. 5 is a side view showing a rotor of a conventional rotating electrical machine, and FIG. 5 is a plan view of the rotor of a conventional rotating electrical machine. 1. Iron core, 2. Coil, 3. Coil end, 4..
Wedge, 5. U-shaped bolt, 6. Fixing plate, 7. End fixing supplies, 8. Optical cable, 9. Transmission/reception unit, 10.
Cable, 11 abnormality determination device.

Claims (1)

[Claims] In a U-shaped bolt abnormality monitoring device for monitoring abnormalities in a U-shaped bolt used for fixing a coil end of a coil wound around a rotating body of a rotating electrical machine, a a central hole, an optical cable installed through the central hole, a transmitting/receiving unit for transmitting an optical signal to this optical cable and receiving an optical signal that has passed through the optical cable, and a transmitting/receiving unit for transmitting an optical signal to the optical cable, An abnormality monitoring device for a U-shaped bolt, comprising: an abnormality determination device that determines an abnormality in the U-shaped bolt based on a signal and a received optical signal.