JPS592527A - Defect detecting mechanism for rotary rectifier - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a failure detection mechanism for a rotary rectifier used for brushless excitation of a synchronous machine.

FIG. 1 is a schematic diagram of a rotary rectifier equipped with a failure detection mechanism according to a conventional example. The shaft of a rotating armature type three-phase AC exciter 1 is coupled to the shaft of a synchronous machine (not shown). A rotary rectifier 2 is provided to rectify the alternating current output from the exciter 1 and supply the excitation current to the field coil of the synchronous machine in a brushless manner. This rotary rectifier 2 includes an annular rotating part 3 attached to the shaft of an exciter 1, six sets of rectifying elements (silicon diodes) 4 attached to the rotating part 3 and connected to a three-phase bridge, and the rectifying elements. The AC side of the three-phase bridge is connected to the armature of exciter 1, and the DC side of the three-phase bridge is connected to the field coil of the synchronous machine. ing. If the rectifying element 4 fails, the fuse 5 connected in series will melt due to the abnormal current flowing through it.
The spread of damage is prevented. Then, by applying the light of the stroboscope 6 emitted in synchronization with the rotation of the rotary rectifying device 2 to the display of the fuse 5, it is possible to determine whether the fuse 5 is blown, that is, if the rectifying element 4 is out of order. However, the above-mentioned failure detection mechanism requires personnel for detection, and even if the rectifying element 4 fails, it has the disadvantage that it cannot be detected unless the operator visually observes it using the stroboscope 6.

FIG. 2 is a partial schematic diagram of a rotary rectifier equipped with a failure detection mechanism according to another conventional example. In this device, a pickup coil 7 that receives the induction of the current flowing through each rectifier 4 and an FM transmitter 8 that is connected to the pickup coil 7 and transmits the state of the current flowing through each rectifier 4 are attached to the rotating part 3. ing. On the fixed side of the rotary rectifier, there is an FM receiver 9 that receives the signal from the transmitter 8, and a detector that detects when this receiver 9 receives an abnormal current state and activates the alarm lO. 11 are provided. Although the above-mentioned failure detection mechanism can automatically detect failures, it has a complicated structure, is expensive, and has low reliability because electronic parts that are susceptible to vibration are attached to the rotating part 3. there were.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks and provide a fault detection mechanism for a rotary rectifier that is capable of automatic and continuous detection, is inexpensive, and has high reliability.

According to the present invention, the above object is a failure detection mechanism of a rotary rectifier in which a fuse with an indicator is connected in series to a rectifying element attached to a rotating part, the light source sending light to the indicator of the fuse; This is achieved by providing an optical sensor that detects the reflected light from the fuse indicator and a converter that converts the signal from the optical sensor.

Embodiments of the present invention will be described below based on the drawings. FIG. 3 is a schematic diagram of a rotary rectifier equipped with a failure detection mechanism according to an embodiment of the present invention.

This fault detection mechanism includes a light source 12 that sends light to a fault indicator of the fuse 5, and a light source 12 that monitors the indicator of the fuse 5.
The light source 1 is connected to a fuse indicator by a moving bar, and converts the optical signal detected by the fuse 5 into an electrical signal and activates the alarm 10.
2. The optical sensor 13, the converter 14, and the alarm 10 are all provided in a fixed part 15 that is fixed separately from the rotating part 3. Therefore, this device can automatically and continuously detect failures in the rectifying element 4, and since there is no need to attach electronic parts to the rotating body 3, it is highly reliable, compared to the failure detection mechanism shown in Fig. 2. The structure is open and inexpensive. Also, by making the optical fiber longer, the converter 7 can be installed in a location free from vibration and electromagnetic interference.

As an application of this invention, if the fuse indicator is color-coded and the sensor is provided with a frequency discrimination function, the fault location of the rectifier can be identified.

[Brief explanation of the drawing]

Fig. 1 is a schematic block diagram of a rotary rectifier equipped with a failure detection mechanism according to a conventional example; Fig. 2 is a partial schematic block diagram of a rotary rectifier equipped with a failure detection mechanism according to another conventional example;
The figure is a schematic configuration diagram of a rotary rectifier equipped with a failure detection mechanism according to an embodiment of the present invention. 3... Rotating part, 4... Rectifying element, 5... Fuse with indicator, 12... Light source, 13... Light sensor, 14
...Converter, 15...Fixed part. Age 1? Figure 2

Claims (1)

[Claims] 1) A failure detection mechanism for a rotary rectifier in which a fuse with an indicator is connected in series to a rectifier element attached to a rotating part,
A rotary rectifier comprising: a light source that sends light to an indicator of the fuse; an optical sensor that detects reflected light from the indicator of the fuse; and a converter that converts a signal from the optical sensor. Equipment failure detection mechanism.