RU1810955C - Device for checking brush-collector assembly of electrical machine - Google Patents

Abstract

The invention relates to electrical engineering and can be used to tune collector electrical machines. The purpose of the invention is to increase accuracy and simplify measurement. The device consists of a proximity sensor of voltage pulses of bits 1, tuner 2, rectangular pulse generator 3, amplifier 4, averaging block 5, pulse level corrector b, and an indication unit. 1 ill.

Description

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The invention relates to electrical engineering and can be used to tune collector electrical machines;

The purpose of the invention is to increase accuracy and simplify measurements.

The drawing shows a block diagram of a device

The device consists of a non-contact sensor 1 of voltage pulses, a tuner 2, a rectangular pulse generator 3, an amplifier 4, an averaging unit 5, a pulse level corrector b and an indication unit 7. A unit 2, a non-contact sensor 1, are connected in series. block 3, amplifier 4, block 5, corrector 6 and block 7. Structurally, the device is made in one housing. The indicator of block 7, the toggle-on switch of the device (in block 6), the adjustment knobs (in block 2) and the pulse level (in block 6) are placed on the front panel. The construction block of the device of the invention includes a tuning regulator, inductive and capacitive elements (inductive coil and variable capacitor) connected in parallel. The tuning regulator located on the front panel of the device is in mechanical communication with the capacitor. The coil is inductively coupled to a directional antenna of the device. The tuning controller changes the value of the capacitance of the variable capacitor and has fixed positions corresponding to the tested electric machine. From here, each type of tested electrical machine corresponds to a certain position of the tuning regulator and the value of the capacitance of the variable capacitor.

The proposed tuner serves to ensure reception with a directional antenna of a certain spectrum of electromagnetic radiation characteristic of each type of electric machine under test, since only a specific spectral composition of electromagnetic radiation corresponds to each type of electric machine. At the same time, with the help of the adjustment regulator of the proposed device, it is tuned to receive a characteristic spectrum of electromagnetic radiation (sparks).

The pulse level correction unit includes a pulse level controller, voltage limiters and voltage combiners, threshold elements. The input signal of the unit varies depending on the degree of sparking and the type of electric machine being tested, and the output signal of the block depends only on the degree of sparking of the electric machine being tested. Level control

pulses sets the signal level and has fixed positions corresponding to the type of electric machine under test.

Proposed Adjustment Block

pulse level is used to provide

measuring electromagnetic radiation

(sparks) of the tested electrical machine using a single display unit. In this case, the sparks of all types of electrical machines are normalized to evaluate sparking according to the GOST 173-74 scale.

Simplification of measurements proposed

the device is achieved through the use of a simpler device with a common display unit for all types of tested electrical machines, which allows the indicator to be calibrated according to the spark class according to

GOST 173-74 scale.

Improving the measurement accuracy of the proposed device is achieved by highlighting the spectrum characteristic of this type of test electric machine

electromagnetic radiation, which allows a higher degree than in the known solution to measure sparks according to GOST 173-74.

The device is powered by an accumulator or battery with a voltage of 8.5-9 V. The directional antenna of the sensor 1 is built into the device housing from one of its sides. The sensor 1, using the tuner 2, receives electromagnetic radiation characteristic of the type of the tested electric machine (sincere). These pulses from the sensor 1 after formation (block 3), amplification

(block 4) and averaging (block 5) are sent to the pulse level correction block (corrector 6), which provides measurement of electromagnetic radiation (spark) of any type of the tested electric machine using a single block indicator

7. In this case, the directional antenna of the sensor

1 simplifies and improves accuracy

measurements to a higher degree than in

well-known solution. Simplification of the device

this is achieved by eliminating the holder bar with the antenna of the known device, and increasing the accuracy of the measurement of the device is achieved by reducing the influence of nearby electrical machines, devices and the mains. The measurement accuracy is also improved due to the fact that the sliding contact state sensor in the proposed device is directed to the sparkling edge of the working brush on the collector.

The device operates as follows. On the front panel of the device’s case, the adjusters and pulse level are set opposite to the type of the electric machine under test, then the device is turned on and the sensor 1 is directed by the antenna to the sparkling edge of the working brush on the collector. Using block 2, the voltage pulses of the discharges with the amplitude and frequency maximum for a given type of the tested electric machine are sent from the sensor 1 to the block 3 of forming rectangular pulses, in which they are generated with a duration equal to the duration of the voltage pulses of the discharge Dov. These pulses are fed to amplifier 4, then to averaging unit 5, which generate signals proportional to the number of pulses and their duration per unit time. From the output of block 5, the pulses are fed to the input of corrector 6, where the level of pulses is adjusted depending on the type of electric machine being tested and stabilized. Corrected and Stabilized

pulses arrive at indication unit 7. The indicator scale of unit 7 is graduated according to the classification of the state of the brush-collector unit and has the legend 1, 1 Ј, 1tg. 2. Condition assessment

2

a sliding contact is made using the indicator of block 7.

Claims (1)

SUMMARY OF THE INVENTION A device for monitoring the operation of a brush-collector assembly of an electric machine, comprising a non-contact discharge pulse voltage sensor, a rectangular pulse forming unit, an amplifier, an averaging unit and an indication unit, characterized in that, in order to increase the accuracy and simplify measurements, it is equipped with a tuner connected to the output of the non-contact pulse voltage pulse detector, and a pulse level corrector connected between the output of the averaging block and input home display unit.