CN111308338A - Three-phase motor vibration online monitoring system using OPLC - Google Patents
Three-phase motor vibration online monitoring system using OPLC Download PDFInfo
- Publication number
- CN111308338A CN111308338A CN201811508647.XA CN201811508647A CN111308338A CN 111308338 A CN111308338 A CN 111308338A CN 201811508647 A CN201811508647 A CN 201811508647A CN 111308338 A CN111308338 A CN 111308338A
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- oplc
- optical fiber
- motor
- vibration
- cable
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
- G01R31/343—Testing dynamo-electric machines in operation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
Abstract
The invention discloses a three-phase motor vibration online monitoring system using an OPLC. The low-voltage power optical fiber composite cable is used as a transmission means of three-phase motor vibration signals, the motor vibration signals are collected by adopting acceleration sensing at the front end, the server is arranged at the rear end, and the collected motor vibration signals are analyzed in a centralized manner to form a complete multi-motor vibration signal collecting and analyzing system. The invention adopts the OPLC as a signal acquisition transmission channel, does not need other external signal wires, does not influence the insulating property among lead wires, and greatly improves the safety coefficient of the motor. The whole system is compact in structure, supports high vibration signal sampling rate, can support a high-sensitivity sensor, is high in signal reduction degree, long in transmission distance and strong in anti-interference capability, can meet the requirement that a plurality of measuring points of a single motor are transmitted through one channel, and is simple to install and low in cost.
Description
Technical Field
The invention relates to the field of fault diagnosis of electromechanical equipment, in particular to a system and a method for collecting and analyzing vibration signals of a motor bearing or a shell.
Background
With the rapid development of science and technology, the degree of mechanical industrialization is also rapidly improved, and the mechanical equipment for modern industrial production gradually becomes complicated, high-speed and automatic. In order to master the operation state of equipment and avoid accidents, people pay more and more attention to the online monitoring and fault diagnosis of key units in production.
The motor vibration can accelerate the abrasion of the motor bearing, so that the normal service life of the bearing is greatly shortened, and great noise can be generated during working. At the same time, motor vibration will cause the winding insulation to drop. The vibration test of the motor can effectively check the current working state of the motor and evaluate the working performance of the motor. Common motor vibrations are mainly: (1) foundation vibration caused by poor foundation rigidity or loosening or resonance of a bottom angle screw; (2) the instability of three-phase current causes the vibration caused by the reduction of torque or the failure of rotor cage bars.
Industrial vibration analysis technology is a detection tool for determining, predicting and preventing rotary equipment failure. The rotating components of the apparatus all have respective specific vibration frequencies. And the amplitude of the vibration is representative of the operating condition or quality of the device. The expansion of the amplitude directly indicates that a rotating component, such as a bearing or gear, has failed. The implementation of the equipment vibration analysis will improve the reliability and working efficiency of the equipment, reduce down time and eliminate electromechanical faults.
Motor faults can be detected using vibration sensors. However, for large enterprises such as iron and steel enterprises, a lot of motors are used in workshops, most motors are installed underground with a complex structure, and vibration information collection and analysis are difficult.
Disclosure of Invention
In order to solve the technical problem, the invention provides an on-line vibration monitoring system for a three-phase motor by using an OPLC.
The technical scheme adopted by the invention for realizing the purpose is as follows: an on-line vibration monitoring system for a three-phase motor using an OPLC, comprising:
the inlet of the master optical fiber modem is connected with the upper computer, and the plurality of outlets are respectively connected with the corresponding slave optical fibers through the optical fibers in different OPLCs;
from the optical fiber modem, connecting with the vibration sensor through an optical fiber;
and the vibration sensor is arranged on the motor.
The OPLC includes a cable and an optical fiber.
The motor power supply cable is a cable in an OPLC cable.
The OPLC completes photoelectric separation in the photoelectric separation box: the OPLC is connected into a photoelectric separation box attached to a motor junction box, and a cable and an optical fiber are respectively led out; the led-out cable is connected to the original motor power supply junction box, and the led-out optical fiber is connected to the slave optical fiber modem.
The slave optical fiber modem is also connected with a piezoelectric acceleration sensor and a laser displacement sensor; the piezoelectric acceleration sensor is installed on the outer bearing cover through threaded connection; the laser displacement sensor is mounted on a support beside the motor.
And the optical fiber modems of the motors are connected to the upper computer in a ring connection mode.
A three-phase motor vibration online monitoring method using an OPLC comprises the following steps:
a master optical fiber modem connected with an upper computer is set to be in a master mode, and a slave optical fiber modem connected with a motor is set to be in a slave mode; and the vibration sensor arranged on each motor collects vibration signals, and the vibration signals are respectively sent to the upper computer through the slave optical fiber modem and the master optical fiber modem in sequence through the corresponding optical fibers in the OPLC.
The OPLC enters from the inlet of the photoelectric separation box, and the optical fiber is stripped by the OPLC and then is connected with the external optical fiber; and leading out the OPLC residual three-phase cable with the optical fiber stripped and entering a motor wiring terminal box.
The invention has the following advantages and beneficial effects:
1. the OPLC is used as a signal acquisition and transmission channel, other external signal wires are not needed, the insulating property among lead wires is not influenced, and the safety coefficient of the motor is greatly improved.
2. The motor fault early warning can be effectively carried out by matching with a monitoring main station.
3. The whole system has compact structure, simple installation and low cost.
Drawings
FIG. 1 is a schematic diagram of the general structure of an embodiment of the present invention;
FIG. 2 is a schematic view of the mounting of a vibration sensor in an embodiment of the invention;
11, an aviation plug, 12, a shell, 13, a shell, 14 and a screw;
FIG. 3 is a schematic view of a photo-voltaic separation junction box according to an embodiment of the present invention;
the device comprises a photoelectric separation box, a fiber winding column, a cable slot, an outlet, a cable outlet, a fusion part and a fiber winding column, wherein the photoelectric separation box comprises 1 an inlet, 2 the fiber winding column, 3 the cable slot, 4 the outlet, 5 the cable outlet and 6 the fusion part.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
The method is characterized in that a low-voltage power optical fiber composite cable (OPLC) is used as a transmission means of three-phase motor vibration signals, the front end of the OPLC is used for collecting the motor vibration signals by adopting acceleration sensing, the rear end of the OPLC is provided with a server, and the collected motor vibration signals are analyzed in a centralized manner to form a complete multi-motor vibration signal collecting and analyzing system. The OPLC is used as a power supply cable of an industrial motor and is also used as a signal transmission channel of a vibration sensor. Photoelectric separation is completed at the motor junction box, an acceleration sensor is installed at the key part of the motor to monitor the vibration signal of the motor on line, and the vibration signal is transmitted back to the data analysis center through the OPLC. And a server is arranged in the data analysis center to complete the analysis of the multi-motor vibration signals and assist the motor predictive maintenance.
The three-phase motor power supply cable is an OPLC cable, and the OPLC cable is a cable integrating a power supply cable and an optical fiber.
The OPLC cable completes photoelectric separation at the motor junction box, namely, the cable and the optical fiber are respectively led out after passing through the photoelectric separation box attached to the motor junction box. The cable is connected with the original motor power supply junction box, and the optical fiber is connected with the optical fiber modem. The sensor signal is coupled into the fiber modem.
The optical fiber modem is a device for converting an RS485 signal into an optical signal and is provided with an RS485 physical interface and two optical fiber physical interfaces.
The sensor is a piezoelectric acceleration sensor. The piezoelectric acceleration sensor is installed on the outer cover of the bearing through threaded connection. The signals of the piezoelectric acceleration sensor are accessed to the optical fiber modem through a serial communication line.
And the optical fiber modems of the motors are connected to the upper computer in a ring connection mode.
The upper computer is a server for processing and analyzing vibration analysis signals.
Fig. 1 is a schematic diagram of the overall structure of the system, taking two motors as an example. The upper computer and a plurality of vibration sensor wiring modems installed on the motor form an annular structure. The optical fiber modem connected with the upper computer works in a master mode, and the other optical fiber modems works in a slave mode.
The optical fiber communication connection is of an annular structure, each optical fiber modem is provided with an IN interface and an OUT interface, the modem connected with the upper computer is set to be IN a master mode, and the modem installed on the motor is set to be IN a slave mode. The modem mounted on each motor sends data to the host computer through a loop. In the figure, a motor 1 sends data, the data reaches an upper computer through a motor 2,
the structure can make the coverage of the temperature measuring point wider, and can be more suitable for the complex working environment of the motor.
The following describes the construction, mounting, etc. of the sensor, modem, optoelectronic separation cartridge.
The vibration sensor is installed on the front end cover of the motor and positioned above the bearing as shown in fig. 2, so that the vibration of the bearing in the vertical direction of the motor can be well measured. The bearing seat or the machine shell 13 of the tested machine is provided with a mounting screw hole, a stud 14 at the bottom of the sensor is screwed in the mounting hole, and then the sensor is screwed at the upper part of the stud. The on-line monitoring probe is composed of a vibration sensor and a signal conditioning circuit and is integrated in a 30 x 70mm cylindrical stainless steel shell 12.
The optical fiber and cable parts of the OPLC cable are separated by the photoelectric separation box, and an aluminum casting box is adopted, as shown in figure 3. The OPLC cable is got into the OPLC wire casing by light electric separation box entry 1, and there is anchor clamps fixed at the entrance, prevents that the OPLC cable from removing. The middle section of the OPLC slot is provided with an optical cable slot 3, an optical cable is stripped by an OPLC cable and enters the optical cable slot 3, then enters the fiber winding part, and a tail fiber is wound by the fiber winding column 2, then is connected with an external optical cable at the welding part 6 and is led out through the outlet 4. And the residual three-phase cable of the OPLC cable stripped with the optical cable is led out from a cable outlet 5 and enters a motor wiring terminal box. The optical cable is two core rubber-insulated-wire optical fibers, wherein one optical fiber is connected with an IN port of the optical modem, and the other optical fiber is connected with an OUT port of the optical modem.
Claims (8)
1. An on-line vibration monitoring system for a three-phase motor using an OPLC, comprising:
the inlet of the master optical fiber modem is connected with the upper computer, and the plurality of outlets are respectively connected with the corresponding slave optical fibers through the optical fibers in different OPLCs;
from the optical fiber modem, connecting with the vibration sensor through an optical fiber;
and the vibration sensor is arranged on the motor.
2. The system of claim 1, wherein the OPLC comprises a cable and an optical fiber.
3. The system of claim 1, wherein the motor power cable is a cable in an OPLC cable.
4. The system of claim 1, wherein the OPLC performs photoelectric separation in a photoelectric separation box: the OPLC is connected into a photoelectric separation box attached to a motor junction box, and a cable and an optical fiber are respectively led out; the led-out cable is connected to the original motor power supply junction box, and the led-out optical fiber is connected to the slave optical fiber modem.
5. The system for the on-line monitoring of the vibration of the three-phase motor by using the OPLC is characterized in that the slave optical fiber modem is also connected with a piezoelectric acceleration sensor and a laser displacement sensor; the piezoelectric acceleration sensor is installed on the outer bearing cover through threaded connection; the laser displacement sensor is mounted on a support beside the motor.
6. The three-phase motor vibration online monitoring system using the OPLC as claimed in claim 1, wherein the optical fiber modems of the plurality of motors are connected to the upper computer in a ring connection manner.
7. The three-phase motor vibration online monitoring method using the OPLC is characterized by comprising the following steps of:
a master optical fiber modem connected with an upper computer is set to be in a master mode, and a slave optical fiber modem connected with a motor is set to be in a slave mode; and the vibration sensor arranged on each motor collects vibration signals, and the vibration signals are respectively sent to the upper computer through the slave optical fiber modem and the master optical fiber modem in sequence through the corresponding optical fibers in the OPLC.
8. The method for monitoring the vibration of the three-phase motor by using the OPLC as claimed in claim 1, wherein the OPLC enters from the entrance of the photoelectric separation box, and the optical fiber is stripped by the OPLC and then connected with the external optical fiber; and leading out the OPLC residual three-phase cable with the optical fiber stripped and entering a motor wiring terminal box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811508647.XA CN111308338A (en) | 2018-12-11 | 2018-12-11 | Three-phase motor vibration online monitoring system using OPLC |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811508647.XA CN111308338A (en) | 2018-12-11 | 2018-12-11 | Three-phase motor vibration online monitoring system using OPLC |
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| Publication Number | Publication Date |
|---|---|
| CN111308338A true CN111308338A (en) | 2020-06-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811508647.XA Withdrawn CN111308338A (en) | 2018-12-11 | 2018-12-11 | Three-phase motor vibration online monitoring system using OPLC |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101179337A (en) * | 2007-12-19 | 2008-05-14 | 深圳市三旺通信技术有限公司 | Method of forwarding simple ring structure serial port modem signal |
| CN203522109U (en) * | 2013-06-29 | 2014-04-02 | 深圳市特发信息股份有限公司 | Photoelectric composite low-voltage cable joint box |
| CN103696977A (en) * | 2013-12-26 | 2014-04-02 | 中国矿业大学 | Mining axial fan vibration test system based on optical fiber sensor |
| CN107219587A (en) * | 2017-07-21 | 2017-09-29 | 中天宽带技术有限公司 | A kind of OPLC separates fusion splicing devices |
| CN206957878U (en) * | 2017-05-27 | 2018-02-02 | 华北电力科学研究院有限责任公司 | Condition monitoring device of wind power machine set and system |
-
2018
- 2018-12-11 CN CN201811508647.XA patent/CN111308338A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101179337A (en) * | 2007-12-19 | 2008-05-14 | 深圳市三旺通信技术有限公司 | Method of forwarding simple ring structure serial port modem signal |
| CN203522109U (en) * | 2013-06-29 | 2014-04-02 | 深圳市特发信息股份有限公司 | Photoelectric composite low-voltage cable joint box |
| CN103696977A (en) * | 2013-12-26 | 2014-04-02 | 中国矿业大学 | Mining axial fan vibration test system based on optical fiber sensor |
| CN206957878U (en) * | 2017-05-27 | 2018-02-02 | 华北电力科学研究院有限责任公司 | Condition monitoring device of wind power machine set and system |
| CN107219587A (en) * | 2017-07-21 | 2017-09-29 | 中天宽带技术有限公司 | A kind of OPLC separates fusion splicing devices |
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Application publication date: 20200619 |
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