JPS5950758A - Rotor for rotary electric machine - Google Patents

Abstract

PURPOSE:To rationalize the measuring work of an insulating resistance by leading the lead wire for measuring the insulating resistance of a field coil of a rotor which is associated within a stator frame through the central hole of a rotational shaft to the end of the shaft. CONSTITUTION:A spacer 11 is inserted into a hole 13 which is formed at the center of a rotaional shaft 2 of a rotor 3 of an AC generator, AC exciter and a rotary commutator associated in a stator frame. A lead wire 9 for measuring an insulating resistance is lead from the lead wire of the field coil of the AC generator. A measurement can be performed without removing a manhole cover whenever the insulating resistance is measrued, inner cleaning can be eliminated, and the measuring work can be rationalized.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotor for a rotating electrical machine, and more particularly to the structure of a rotor used in a turbine generator.

In a rotating electric machine equipped with an alternating current generator, an alternating current exciter, and a rotating rectifier in the stator frame, the conventional method is to measure the insulation resistance of the field coil by removing the manhole cover etc. installed on the stator and measuring the insulation resistance of the field coil. Previously, measurements were taken by inserting measurement terminals from the rotor to the exposed part of the rotor's conductive parts.
With this method, the manhole cover had to be removed every time measurements were taken, and the exposed part was inside, making it difficult to work.

In addition, if the stator has an internal pressure explosion-proof structure and a manhole cover is opened, power plants that require internal scavenging or
This was extremely inconvenient for power plants where insulation resistance was measured every time the power plant started or stopped.

An object of the present invention is to provide a rotor structure for a rotating electrical machine that allows easy measurement of insulation resistance of a field coil.

The gist of the present invention is that in a rotor of a rotating electric machine that is equipped with an alternating current generator, an alternating current exciter, and a rotary rectifier in a stator frame, one terminal from a field coil is passed through a center hole and is connected to the outside of a bearing part. It has a structure that allows easy measurement of the insulation resistance of the rotor, which has a pull-out structure.

An embodiment of the invention is shown in FIGS. 1 and 2.

In a rotor of a rotating electric machine, an alternating current generator rotor part 3, an AC exciter rotor part 4, and a rotating rectifier part 5 are provided in a stator frame 1, and further has a °C bracket 7 and a bearing 8 at both ends. The insulation resistance measuring lead 9 is taken out from the lead wire leading to the alternator field coil, and is pulled out through the center hole to the end of the shaft, so that the insulation resistance of the rotor lead can be easily measured.

In the figure, 2 is a shaft, 6 is a cover for the radial fan 10, and 11 is a spacer.

According to the present invention, the insulation resistance of the rotor lead can be measured without removing the manhole cover etc. provided on the stator frame.

In addition, in the case of power plants, etc., where whenever a manhole cover, etc. of an internal pressure explosion-proof type is opened, internal air scavenging is performed to clean the gas inside the stator frame. Internal scavenging was necessary every time, but by adopting the method of the present invention, this becomes unnecessary.

Furthermore, some power plants measure insulation resistance every time they start or stop, but from now on, it will be necessary to open manhole covers and measure insulation resistance every time there is a start or stop, and in places where it is difficult to work. It disappears.

[Brief Description of the Drawings] Fig. 1 is a cross-sectional view of the structure of a conventional rotating electric machine in which an alternating current generator/AC exciter rotating rectifier is built into the stator frame, and Fig. 2 shows an insulation resistance measurement lead according to the present invention. It is a detailed drawing of the drawer. DESCRIPTION OF SYMBOLS 1... Stator frame, 2... Shaft, 3... AC generator rotor part, 4... AC exciter rotor part, 5...
Rotating rectifier section, 6... Radial fan, 7... End bracket, 8... Bearing, 9... Insulation resistance measurement lead, ]0... Cover, 11... Spacer. Agent Patent Attorney Akinai Takahashi

Claims (1)

[Claims] 1. In the rotor of a rotating electrical machine that incorporates an alternating current generator, an AC exciter, and a rotating rectifier in the stator frame, pass the lead wire for measuring the insulation resistance of the field coil through the center hole of the shaft of the rotating electrical machine. A rotor for a rotating electrical machine characterized by being pulled out to the end.