JPS644152B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a commutation measuring device for measuring the commutation state between a commutator surface and a brush sliding on the surface.

In conventional commutation tests, as shown in JISE61015/4, the size and number of sparks generated between the commutator surface and the end of the brush that slides on the surface is observed depending on the state of commutation. The quality of rectification was expressed by number.

Sparks generated due to poor rectification include sparks that last for a certain period of time at a relatively fixed position with slight changes, and sparks that appear and disappear instantly at extremely uncertain positions, and there are also sparks that occur when determining the number of sparks. It is thought that the size and number of afterimages in the eye may be misperceived when there is a slight difference in the time of occurrence, so it requires considerable attention and experience, and the results are subjective. Ta. On the other hand, it is also possible to directly convert and measure sparks into electrical quantities.
A method has been implemented in which a search coil is placed near the brush and the high-frequency current generated from the spark is measured, but this method may be affected by factors such as the width of the spark's transmission frequency band, noise contamination, and how the search coil is installed. However, since it was not possible to directly show the relationship between the measured quantity of electricity and the number of measurements, calibration was required each time, which was inconvenient in handling.

This invention solves the above-mentioned disadvantages,
The present invention aims to provide a rectification measuring device that quantitatively measures and displays the rectification state.

The rectification measurement device of the present invention uses a fiberscope to capture and focus arc light due to a rectification failure that occurs unexpectedly and at an uncertain position, and converts light to electrical energy using a phototransistor combined with the arc light. It is characterized by quantifying the rectification number and displaying it digitally.

The present invention will be explained below based on the drawings of the embodiments. FIG. 1a is a block diagram for explaining the rectification measuring device according to the present invention, and FIG. 1b shows a front view of the perspective part of FIG. 1a.
In the figure, for example, a sensor in which one end of a cable-like fiberscope 1 made up of 32 0.5φ elements is molded with epoxy resin or the like to rectify and disperse the elements in a straight line and mechanically fix them firmly. The part 2 is arranged to face the sliding end 5 of the commutator surface 3 and the brush 4. After keeping the other end of the fiberscope at a suitable length, it is optically coupled to the light receiving section 7 of the phototransistor via the lens 6. The phototransistor is configured as a part of an optical-to-electrical converter 8 consisting of an amplifier, an attenuator, a level slicer, etc., and the output of the optical-to-electrical converter 8 is digitized by an A-B converter 9 having a gate circuit. Display digitally. Note that the optical-electrical converter 8 has external output terminals 8a and 8b.
It is now possible to connect a suitable recorder (such as a bisicorder).

Now, a rectifying spark 1 is placed at an uncertain position on the sliding end 5.
When rectifying sparks 10a, 10b, 10c, and 10d are generated, the elements of the fiberscope 1 arranged in the vicinity of the respective generation positions of the rectifying sparks 10a, 10b, 10c, and 10d adjust the size (brightness and brightness) of each spark.
(duration time, etc.) is transmitted to the light receiving section 7. In the light receiving section 7, whether there is one rectifying spark, whether there are multiple sparks, or whether the emitted light changes over time, the amount of rectified sparks within the opening and closing time of the gate circuit is aggregated and processed as a total amount. Then, convert it into the corresponding amount of electricity and digitize it. If the input destination is too large or too small for the characteristics of the light receiving section 7,
It is possible to electrically appropriately adjust the sensitivity of the optical-to-electrical converter 8, and if you compare it with the spark number in advance during A-D conversion of the electrical quantity, the digital display of 1 to 8 Able to achieve a given objective. Once this calibration is done,
There is no need to carry out the process again unless the attachment relationship (distance, angle, etc.) between the sensor section 2 and the sliding end section 5 is changed.

[Brief explanation of drawings]

FIG. 1a is an explanatory block diagram of a rectification measuring device according to the present invention, and FIG. 1b is a perspective partial front view of FIG. 1a. 1...Fiber scope, 2...Sensor section, 3
... Commutator piece, 4 ... Brush, 5 ... Sliding end,
6... Lens, 7... Light receiving section, 8... Optical-electric conversion section, 9... AD conversion section.

Claims (1)

[Claims] 1. In a device for measuring the rectification state between a commutator surface and a brush that slides on the surface, a sensor section in which elements at one end of a cable-shaped fiberscope are arranged and fixed is placed between the commutator surface and the brush. The fiberscope is placed facing the sliding end of the fiberscope, captures and condenses arc light corresponding to the size of the spark generated at an uncertain position on the sliding end, and sends an optical beam to the other end of the fiberscope. 1. A rectification measurement device characterized by transmitting light to a light receiving section coupled to a light receiving section, converting light to electrical energy, quantifying a rectification number, and displaying the result digitally.