JPS60148356A - Monitor of coil of rotary electric machine - Google Patents

Abstract

PURPOSE:To always monitor the fixed state of a coil by providing a pressure/ electric converter in the slot of a core of a rotary electric machine and indicating the output. CONSTITUTION:A lower coil 1, a slot bottom liner 2, an upper coil 4, a wedge lower liner 5, a wedge 6 and a side spacer 7 are inserted into a slot. A piezoelectric element 8 for detecting the variation in the radial pressure is provided between the coils 1 and 4. Information of the variation in the pressure which becomes an electric signal is externally supplied via lead wirings 9 to an indicator 9 via the element 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a device for monitoring the fixed state of a coil of a rotating electric machine.

[Technical Background of the Invention and Problems thereof] An example of a structure within a slot of a conventional rotating electrical machine will be explained with reference to FIG. In FIG. 1, 1 is a lower coil, 2 is a slot bottom liner inserted to bring the lower coil into close contact with the stator core, 3 is a separator containing a temperature sensing resistor, and 4 is an upper coil. The separator 3 is inserted between the lower coil 1 and the upper coil 4 to avoid contact at the intersection of the coil ends and corona discharge phenomenon, and the slot where no resistance temperature detector is installed has the same thickness as the resistance temperature detector. 15 to match the radial length of the insert. .

5 is a wedge lower liner, and 6 is a wedge inserted to fix the upper and lower coils together with each liner, etc. in the radial direction. Here, the under-wedge liner 5 is inserted to adjust for manufacturing variations in the coil and to securely fix the coil. A side spacer 7 is inserted to fix the coil in the slot in the circumferential direction. With the above structure, the lower coil 1 and the upper coil 4 are firmly fixed in order to prevent vibrations due to the alternating current flowing through them and field flux, and to improve heat conduction between the coils and the iron core.

However, the volume of the stator coil shrinks due to aging of the insulator, and the resulting reduction in fixing pressure causes vibration in the worst case.

This vibration may cause loss S to the insulation of the coil, and in the worst case, this damage may cause a ground fault.

Although it is important to monitor the fixed pressure of the stator coil, there is currently no system that constantly monitors it, and if a problem such as vibration noise occurs, the rotating electric machine is stopped and the slot It would be impossible to do so without removing the wedge or coil.

[Purpose of the invention]

An object of the present invention is to provide a device that can constantly monitor the fixed state of the coils of four rotating machines.

[Summary of the invention]

The monitoring device of the present invention constantly detects changes in the pressure applied to the coil as an electrical signal by using a pressure element installed in a slot, and displays the state on a display device.

[Embodiments of the invention]

An example of the present invention is shown in FIG. 2. In Fig. 2, 1.2.4.5.6.7 are the lower coil, slot liner, upper coil, wedge lower liner, wedge, and side spacer, respectively, as in Fig. 1. 8 is a piezoelectric element equipped to detect pressure changes in the radial direction, and the depth of the slot is designed in consideration of the thickness of this piezoelectric element. 9 is a lead wire for connecting the pressure change information converted into an electric signal by 8 to an external display instrument. At the end of the lead wire 9 is a pressure gauge 9 and a display device 1 such as an indicator light and a buzzer.
Connect 0.

With this configuration, fluctuations in the pressure that fixes the upper and lower coils are detected by the piezoelectric element 8 as an electrical signal. This is led through the entire lead wire 9 to the display device 10, and the fixed pressure of the coil can be constantly monitored without stopping the rotating electric machine.

〔Effect of the invention〕

As described above, according to the present invention, stator coils can be constantly monitored, damage to coil insulation and ground faults can be prevented, and the necessity of inspection can be appropriately determined. .

That is, the reliability of the equipment is improved by changing the maintenance work from processing after the occurrence of a malfunction to processing before the occurrence of the malfunction.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a stator slot of a conventional rotating electrical machine, and FIG. 2 is a configuration diagram of a coil monitoring device for a rotating electrical machine showing an embodiment of the present invention. 1...Lower coil 4...Upper coil 8...Pressure element 10...Display device agent Patent attorney Noriyuki ff1(4:+(1 other person)
Figure 1

Claims (1)

[Claims] 1. A monitoring device for a coil of a rotating electric machine, comprising a pressure-electric conversion element provided in a slot of an iron core of the rotating electric machine, and a display device that displays the output thereof.