CN219715600U - Improved insulation resistance measuring device of coal mining machine motor - Google Patents
Improved insulation resistance measuring device of coal mining machine motor Download PDFInfo
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- CN219715600U CN219715600U CN202320971719.4U CN202320971719U CN219715600U CN 219715600 U CN219715600 U CN 219715600U CN 202320971719 U CN202320971719 U CN 202320971719U CN 219715600 U CN219715600 U CN 219715600U
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- insulation resistance
- singlechip
- filter
- mining machine
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- 238000009413 insulation Methods 0.000 title claims abstract description 21
- 239000003245 coal Substances 0.000 title claims abstract description 18
- 238000005065 mining Methods 0.000 title claims abstract description 12
- 239000003990 capacitor Substances 0.000 claims abstract description 23
- 238000005259 measurement Methods 0.000 abstract description 9
- 238000000034 method Methods 0.000 abstract description 4
- 238000001914 filtration Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
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- Measurement Of Resistance Or Impedance (AREA)
Abstract
The utility model designs an improved coal mining machine motor insulation resistance measuring device, which specifically comprises: the device comprises a direct current power supply, a voltage dividing resistor, a measured resistor, a filter amplifier, a filter capacitor, an A/D converter, a singlechip, a display and keys; on the basis of adopting a traditional measuring method of the insulation resistance of the motor of the coal mining machine, a capacitor C is connected in parallel on a divider resistor to serve as a filter capacitor to filter interference signals, and the A/D converter is combined to perform digital calculation, so that the functions of direct measurement and calculation are realized; the filter capacitor is adopted in hardware to isolate external interference, so that interference of alternating current components such as ripple voltage and the like to a measuring circuit is reduced, voltage noise is suppressed, and measuring precision and stability are improved.
Description
Technical Field
The utility model belongs to the field of coal mines, and particularly relates to an improved insulation resistance measuring device of a coal mining machine motor.
Background
In the actual operation of the coal mining machine motor, phenomena such as electric leakage and short circuit can be caused under the influence of factors such as heating, pollution and aging, and the safety of equipment and personnel is threatened. In the operation of the motor, the insulation resistance is an important technical index, and the insulation resistance is good so that the motor can be ensured to normally operate. At present, the instrument for testing the insulation resistance of the motor is mainly a mechanical megohmmeter, also called an insulation resistance tester, and the megohmmeter has the advantages of huge volume, complex operation, single testing voltage, low measuring range and low precision, and is gradually abandoned by people.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model provides an improved insulation resistance measuring device of a coal mining machine motor. On the basis of adopting a traditional measuring method of the insulation resistance of the motor of the coal mining machine, a capacitor C is connected in parallel on a divider resistor to serve as a filter capacitor to filter interference signals, and an AD circuit is combined to perform digital calculation, so that direct measurement and calculation functions are realized; the device is characterized in that aiming at the problems of poor anti-interference performance, low precision and the like of the traditional coal cutter motor insulation resistance measurement method, on the basis of researching main reasons of the coal cutter motor insulation resistance measurement error, a high-precision coal cutter motor insulation resistance measurement circuit is provided, external interference is isolated by adopting a filter capacitor on hardware, interference of alternating current components such as ripple voltage and the like on the measurement circuit is reduced, voltage noise is suppressed, and measurement precision and stability are improved.
An improved coal mining machine motor insulation resistance measuring device specifically comprises: the device comprises a direct current power supply, a voltage dividing resistor, a measured resistor, a filter amplifier, a filter capacitor, an A/D converter, a singlechip, a display and keys;
the output end of the direct current power supply is connected with the voltage dividing resistor, the measured resistor, the filter capacitor and the input end of the singlechip; the filter capacitor is connected in parallel with the two ends of the divider resistor and the measured resistor and is connected with the input end of the filter amplifier; the output end of the filter amplifier is connected with the input end of the A/D converter; the output end of the A/D converter is connected with the input end of the singlechip; the key is connected with the input end of the singlechip; the input end of the display is connected with the output end of the singlechip.
The utility model has the beneficial technical effects that:
according to the utility model, the filter capacitor is adopted on hardware to isolate external interference, the capacitor C is connected in parallel on the divider resistor to serve as the filter capacitor to filter interference signals on the basis of adopting a traditional coal cutter motor insulation resistance measuring method, and the AD circuit is combined to perform digital calculation, so that the direct measurement and calculation functions are realized; the interference of alternating current components such as ripple voltage and the like on a measuring circuit is reduced, voltage noise is suppressed, and the measuring precision and stability are improved.
Drawings
FIG. 1 is a schematic diagram of a structure of a measuring device for insulation resistance of a coal cutter motor according to an embodiment of the utility model;
FIG. 2 is a waveform diagram of a filtering effect according to an embodiment of the present utility model.
Detailed Description
The utility model will be described in more detail below with reference to the drawings and examples;
the working process of the device is that the singlechip is used as a control core, the output voltage of the direct current power supply is supplied to the singlechip for working and is added to the insulation resistance and the voltage dividing resistance of the tested coal mining machine motor, the filtering capacitor filters interference signals and then samples signals, the signals are filtered and amplified, the sampled voltages are converted into digital quantities through A/D conversion, and then the digital quantities are sent to the singlechip for processing and the display displays the measured data results.
An improved coal mining machine motor insulation resistance measuring device, as shown in fig. 1, specifically comprises: the device comprises a direct current power supply, a voltage dividing resistor, a measured resistor, a filter amplifier LM358, a filter capacitor, an A/D converter ADS1110, a singlechip MSP430, a display and keys;
the output end of the direct current power supply is connected with the voltage dividing resistor, the measured resistor, the filter capacitor and the input end of the singlechip; the filter capacitor is connected in parallel with the two ends of the divider resistor and the tested resistor, and an output sampling signal is connected with the input end of the filter amplifier; the output end of the filter amplifier is connected with the input end of the A/D converter; the output end of the A/D converter is connected with the input end of the singlechip; the key is connected with the input end of the singlechip; the input end of the display is connected with the output end of the singlechip.
DC power supply: the voltage is applied to the resistor under test and the voltage dividing resistor.
Voltage dividing resistance and measured resistance: the voltage dividing resistor is connected with the tested insulation resistor in series to realize resistor voltage division, and then voltage and current sampling is carried out.
Filter capacitance: the capacitor C is connected in parallel on the resistor, the characteristic of the capacitor is that the voltages at the two ends cannot be suddenly changed, and the capacitor has the characteristic of blocking the voltage change rate, and the filtering effect can be realized by utilizing the characteristic of blocking the voltage change rate, so that interference signals can be filtered.
And (3) filtering and amplifying: filtering and amplifying the sampled signal and passing the sampled voltage through a voltage follower having a high input impedance can reduce conversion errors and thereby improve measurement accuracy. The waveform diagram of the filtering effect is shown in figure 2;
AD conversion: the sampled voltage is passed through a voltage follower and into the voltage input of an A/D converter, which converts the analog quantity into a digital quantity.
Singlechip, display and button: the digital quantity output by the A/D converter is sent to the singlechip for processing, and the measurement result is displayed on the display.
Claims (1)
1. An improved coal mining machine motor insulation resistance measuring device is characterized by comprising the following components: the device comprises a direct current power supply, a voltage dividing resistor, a measured resistor, a filter amplifier, a filter capacitor, an A/D converter, a singlechip, a display and keys;
the output end of the direct current power supply is connected with the voltage dividing resistor, the measured resistor, the filter capacitor and the input end of the singlechip; the filter capacitor is connected in parallel with the two ends of the divider resistor and the measured resistor and is connected with the input end of the filter amplifier; the output end of the filter amplifier is connected with the input end of the A/D converter; the output end of the A/D converter is connected with the input end of the singlechip; the key is connected with the input end of the singlechip; the input end of the display is connected with the output end of the singlechip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320971719.4U CN219715600U (en) | 2023-04-26 | 2023-04-26 | Improved insulation resistance measuring device of coal mining machine motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320971719.4U CN219715600U (en) | 2023-04-26 | 2023-04-26 | Improved insulation resistance measuring device of coal mining machine motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219715600U true CN219715600U (en) | 2023-09-19 |
Family
ID=87979263
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320971719.4U Active CN219715600U (en) | 2023-04-26 | 2023-04-26 | Improved insulation resistance measuring device of coal mining machine motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219715600U (en) |
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2023
- 2023-04-26 CN CN202320971719.4U patent/CN219715600U/en active Active
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