KR101446674B1 - Method and system for measuring temperature of rotor - Google Patents

Abstract

The present invention relates to a method and a system for measuring the temperature of a rotor in which more a precise measurement is possible, compared with cases using conventional infrared thermometers, due to being able to measure the surface temperature of an object by simulating a stationary position for the object. The method for measuring a temperature of a rotor includes a step of detecting a frequency in which a light-emitting unit is operated in a predetermined frequency toward a rotor to be measured; and detecting a lighting frequency of the light-emitting unit at a point where a rotary frequency of the rotor and the lighting frequency of the light-emitting unit correspond to each other; and a step of measuring a temperature in which infrared rays, radiated from the rotor due to the operation of an infrared light receiving unit in the same cycle as the operating cycle of the lighting frequency of the light-emitting unit detected in the step of detecting the frequency, are detected for each of the operating cycles to measure the temperature.

Description

METHOD AND SYSTEM FOR MEASURING TEMPERATURE OF ROTOR [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and system for measuring the temperature of a rotating body and, more particularly, to a method and system for measuring the temperature of a rotating body that can precisely measure the surface temperature of a rotating body rotating at low speed or high speed .

In the case of large generators and motors, maintenance should be monitored through continuous status monitoring, since failure should not occur for long operation.

In particular, unlike a stator, which is relatively simple to measure, the temperature of the rotor is measured using a contact or non-contact method.

Conventionally, the rotating body temperature measuring method can be largely divided into a contact type and a non-contact type.

In the case of contact type, a temperature sensor (thermocouple or thermistor, for example) is attached to each rotor temperature measurement point, and temperature is measured by transmitting an analog signal to the outside through a brush / slip ring that rotates with the rotor shaft .

In this method, maintenance is always added because the part to be always rubbed necessarily occurs, and it is difficult to apply to the high-speed rotary machine due to the structural limit of the brush / slip ring.

In the non-contact type, the sensor measurement itself can be divided into a radio measurement method in which an existing temperature sensor (for example, a thermocouple or a thermistor) is applied but only signal transmission is performed in a noncontact manner and a method in which temperature sensing itself is treated as a noncontact physical phenomenon.

The wireless measurement system uses a wireless communication system for signal transmission. However, there is a problem that a separate portable power source and a measuring instrument must be integrated into the inside of the rotor.

The method of non-contact processing of temperature sensing is largely a method using a temperature-dependent emission infrared ray method and a method using a temperature-dependent impedance change.

In general, infrared temperature measurement methods are preferred because of sensor implementation and ease of measurement.

In the conventional infrared sensor system, the surface temperature of the measuring object is measured by the average value of the measuring points of the selected sensor in consideration of the measuring distance. When the measuring object rotates, it is difficult to measure the local surface temperature of the rotating part as accurately as the stationary state .

Temperature Measurement In case of a method in which a temperature sensor is directly attached to a target object and the signal is transmitted only by radio, when the target rotating body rotates at a high speed of 6,000RPM or more, it is difficult to mechanically attach the sensor module due to the unbalance of the rotating body or centrifugal force .

[Prior Art Document] Published Japanese Patent Application No. 10-1993-0002807 (Feb. 23, 1993)

An object of the present invention to solve the above problems is to provide a method of measuring the temperature of a surface of a measurement target object as compared with a conventional infrared thermometer, And to provide a method and system for measuring the temperature of a rotating body.

According to an aspect of the present invention, there is provided a method for measuring temperature of a rotating body, the method comprising: operating a light emitting unit to emit light toward a rotating body to be measured at a predetermined frequency, A frequency detecting step of detecting a lighting frequency of the light emitting unit at a time point when the light emitting unit is turned on; An infrared detection step of detecting infrared rays radiated from the rotating body every ON / OFF operation cycle as the infrared light receiving unit is turned on / off at a cycle equal to the lighting cycle of the lighting frequency of the light emitting unit detected in the frequency detecting step; And a temperature measuring step of measuring a temperature based on the infrared ray detected in the infrared ray sensing step.

Preferably, the starting point of the light emitting unit and the starting point of the infrared light receiving unit are coincident with each other.

Preferably, an OFF start point of the infrared light-receiving unit is made faster than a light-off end point of the light-emitting unit.

Preferably, in the temperature measurement step, a plurality of infrared ray receiving units are provided, and each infrared ray receiving unit can detect infrared rays radiated from different positions of the rotating body.

Preferably, in the temperature measurement step, the temperature distribution of each rotating body can be measured based on the infrared rays detected by the respective infrared ray receiving portions.

According to an aspect of the present invention, there is provided a temperature measurement system for a rotating body, comprising: a light emitting unit emitting light of a predetermined frequency toward a rotating body to be measured; An infrared ray receiving unit for detecting infrared rays radiated from the rotating body; A frequency detecting module for detecting a lighting frequency of the light emitting unit in a state in which the lighting frequency of the light emitting unit is adjusted so as to coincide with the rotation frequency of the rotating body; A control unit including a light receiving unit control module for turning on and off the infrared light receiving unit and a temperature measuring module for sensing infrared rays received at the ON / OFF operation period in the infrared light receiving unit and measuring temperature.

Preferably, the light-receiving unit control module of the control unit can further control the lighting start point of the light-emitting unit to coincide with the ON start point of the infrared light-receiving unit.

Preferably, the light-receiving unit control module of the control unit can further control the OFF start point of the infrared light-receiving unit to be faster than the light-off end point of the light-emitting unit.

Preferably, a plurality of the infrared ray receiving portions are provided, and each infrared ray receiving portion can detect infrared rays radiated from different positions of the rotating body.

Preferably, the temperature measurement module of the control unit may measure the temperature distribution of each rotating body based on the infrared rays detected by the respective infrared ray receiving units.

As described above, since the temperature of the surface of the object to be measured can be measured as if it is stopped as compared with the case where the conventional infrared thermometer is applied, it is advantageous that the measurement can be performed more accurately than the conventional method.

Further, it is advantageous in that it is possible to scan the temperature distribution and the thermal image in the rotating state according to the characteristics, types, and the number of the infrared ray receiving portions.

In addition, unlike the radio measurement method, which is the most precise method of existing methods, there is no need to install a separate measuring device in the rotating body, and a structure such as a slip ring is unnecessary, so that the structure for temperature measurement can be minimized have.

1 is a configuration diagram showing a schematic configuration of a temperature measurement system of a rotating body according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating frequencies of a temperature measurement system light emitting unit and an infrared ray receiving unit according to an embodiment of the present invention.
Figs. 3 to 5 are diagrams for explaining the rotation afterimage. Fig.
6 is a flowchart illustrating a method of measuring a temperature of a rotating body according to an embodiment of the present invention.

The present invention may be embodied in many other forms without departing from its spirit or essential characteristics. Accordingly, the embodiments of the present invention are to be considered in all respects as merely illustrative and not restrictive.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms.

The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, .

On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present application, the terms "comprises", "having", "having", and the like are intended to specify the presence of stated features, integers, steps, operations, components, Steps, operations, elements, components, or combinations of elements, numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like or corresponding elements are denoted by the same reference numerals, and a duplicate description thereof will be omitted.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, the system for measuring the temperature of a rotating body according to an embodiment of the present invention includes a light emitting unit 100, an infrared ray receiving unit 200, and a controller 300.

The light emitting unit 100 is a component that emits light of a predetermined frequency toward the rotating body R to be measured.

The rotating body R means a rotating shaft or a rotating body of an engine generator, a large-sized high-speed rotating machine, or the like.

The light emitting unit 100 may be configured to emit light of a predetermined frequency toward an end or an outer peripheral surface of the rotating body R. Hereinafter, a case of emitting light to the end of the rotating body R will be described as an example Explain it.

The light emitting unit 100 is a component operating on the same principle as a stroboscope.

The stroboscope is a device for electrically generating periodically changing illumination to observe an object rotating or vibrating or measuring a rotation speed, a vibration frequency, or a similar cycle amount. The rotation period of the rotation body and the light period of the illumination And it is a device that can measure the number of revolutions (the number of vibrations of the vibrating body) of the rotating body by adding or subtracting the blinking of illumination by using the principle that the rotating body appears to be coincident with each other.

Specifically, when the rotation frequency (or rotation period) of the rotating body R coincides with the lighting frequency (or the lighting cycle) of the light emitting unit 100, the rotating body R appears to stop.

That is, as shown in FIG. 3, when the second rotation position B1 after one rotation period coincides with the first rotation position A, a stop pattern appears and appears to stop.

On the other hand, as shown in FIG. 4, when the second rotation position B2 after one rotation period is slightly less than the first rotation position A, a reverse rotation pattern is generated and appears to rotate in the reverse direction.

5, when the second rotation position B3 after one rotation period after the first rotation position A rotates a little further, a forward rotation pattern is generated and appears to be forward rotation.

As described above, the light emitting unit 100 emits light of a predetermined frequency toward the rotating body R to be measured, and the rotating frequency (or the rotating frequency) of the rotating body R (Or rotation period) of the rotating body R as the light is irradiated to the rotating body (or the rotation period).

The infrared ray receiving unit 200 is a component for detecting infrared rays radiated from the rotating body R.

In general, all objects with an absolute temperature of -273 ° C or higher emit infrared rays corresponding to the temperature, so that the temperature of the object can be measured by measuring the emitted infrared rays.

As described above, the infrared ray receiving unit 200 senses infrared rays radiated from the rotating body R and transmits information about the sensed infrared rays to the controller 300. [

Meanwhile, a plurality of the infrared ray receiving units 200 may be provided, and each infrared ray receiving unit 200 senses infrared rays radiated from different positions of the rotating body R. FIG.

For example, when the temperature of the end portion side of the rotating body R is measured, the infrared ray receiving portion 200 may detect the infrared rays detected at the upper end portion, the lower end portion, the left end portion, Four sensors may be provided.

When measuring the surface temperature of the rotating body R, the infrared ray receiving unit 200 measures the surface temperature of the rotating body R so as to detect the infrared rays detected by the upper surface, the lower surface, the left surface, A dog may be provided.

As described above, the infrared ray receiving unit 200 senses infrared rays radiated from the rotating body R, and information about the sensed infrared rays is transmitted to the controller 300. [

The control unit 300 includes a frequency detection module 310, a light receiving unit control module 320, and a temperature measurement module 330.

The frequency detecting module 310 is a module for detecting the lighting frequency of the light emitting unit 100 in a state in which the lighting frequency of the light emitting unit 100 is adjusted to coincide with the rotation frequency of the rotating body R.

That is, in a state where the rotation frequency (or rotation period) of the rotating body R coincides with the lighting frequency (or the lighting cycle) of the light emitting unit 100 and the rotating body R seems to stop, The rotation frequency of the rotor R is indirectly measured as the lighting frequency of the rotor 100 is detected.

At this time, whether or not the rotation frequency (or rotation period) of the rotating body R coincides with the lighting frequency (or the lighting cycle) of the light emitting unit 100 may be determined by a measurer to measure the temperature, (Or rotation period) of the rotary body R and the rotation frequency of the light emitting unit (R) when the photographed image is the same image for a predetermined period of time, The lighting frequency (or the lighting cycle) of the lighting apparatus 100 can be determined to match.

The rotational frequency of the rotating body R can be indirectly measured through the above-described process.

The light receiving unit control module 320 is a module for turning on / off the infrared light receiving unit 200 at the same cycle as the lighting period of the lighting frequency of the light emitting unit 100 detected by the frequency detecting module 310.

In other respects, turning on / off the infrared light-receiving unit 200 at the same cycle as the lighting period of the lighting frequency of the light-emitting unit 100 means that the infrared light-receiving unit 200 is turned on / off at the same cycle as the rotation frequency of the rotational frequency of the rotating body R, It can be understood that the control unit 200 is turned ON / OFF.

Specifically, when the rotational frequency of the rotating body is N1 and the lighting frequency of the light emitting portion is N2, the lighting period of the light emitting portion 100 is T1 = 1 / N2 [Sec] And the lighting period of the light emitting unit 100 may be regarded as coinciding with the rotation period (1 / N1) of the rotating body R.

Accordingly, as the lighting period T1 of the light emitting unit 100 coincides with the ON / OFF operation period T2 of the infrared light receiving unit 200, the rotation period of the rotating body R and the ON period of the infrared light receiving unit 200 / OFF Operation cycle can be matched.

As a result, the measurement position of the rotating body R, in which the infrared ray receiving unit 200 measures infrared rays at the first rotational position A of the rotating body R, is measured at the second rotational position B after one rotational cycle, The infrared light receiving unit 200 is at the same position as the measurement position of the rotating body R for measuring infrared rays.

That is, the measurement position of the rotating body R, in which the infrared ray receiving unit 200 measures infrared rays, is the same at every rotation cycle, and the infrared ray receiving unit 200 detects the state where the rotating body R is stopped It is possible to detect the infrared ray in the same state as that in which the infrared ray is detected.

If the duty ratio of the light emitting unit 100 is defined as ((T3 - T2) / T1) × 100 [%], T3 is determined so that the duty ratio becomes 50% Depending on the nature of this, this value can be changed.

2, the ON / OFF operation cycle of the infrared light receiver 200 must be synchronized with the light emission period of the light emitting unit 100, and the light receiver control module 320 controls the ON / So that the lighting start timing t1 of the unit 100 coincides with the turning on timing t4 of the infrared light receiving unit 200.

The infrared light-receiving unit 200 can be realized by an infrared temperature sensor, and it is possible to realize such an operation by matching the starting point of the infrared temperature sensor with the starting point of the light-emitting unit 100.

Since the ON / OFF operation period T2 of the infrared light receiving section 200 is the same as the light emitting period T1 of the light emitting section 100, the period of ON / OFF operation of the infrared light receiving section 200 is matched with the rotation period in which N1, Loses.

The light receiving unit control module 320 further controls the OFF start point of the infrared light receiving unit 200 to be faster than the light end point of the light emitting unit 100.

This is because the OFF start time t5 of the infrared ray receiving unit 200 is determined in consideration of the frequency characteristic of the light receiving unit. The cutoff frequency must be sufficiently higher than the rotational frequency of the rotating body R to measure This is because it is possible to precisely measure the temperature of the surface of the rotating body (R).

When the number of rotations of the measurement rotating body R is changed, the temperature of the surface of the measurement rotating body R is precisely measured by changing the frequencies of the light emitting unit 100 and the infrared light receiving unit 200, It becomes possible.

The temperature measuring module 330 senses infrared rays received by the infrared light receiving unit 200 every ON state of the ON / OFF operation period and measures the temperature.

The temperature measuring module 330 may include a plurality of infrared ray receiving units 200. The temperature measuring module 330 may measure the temperature of the rotating body R based on the infrared rays detected by the infrared ray receiving units 200, The temperature of each part of the substrate can be measured individually.

Therefore, the temperature measurement module 330 can measure the temperature distribution of the rotor R according to the position of the rotor R based on the infrared rays sensed by the respective infrared ray receivers 200.

For example, when the infrared light receiving portion 200 is provided on the upper end, the lower end, the left end, and the end right of the end portion of the rotating body R, the upper end portion, the lower end portion, , And the temperature at the right side of the end portion can be measured, respectively.

Hereinafter, a method of measuring the temperature of the rotating body R using the temperature measuring system of the rotating body as described above will be described.

First, the light of the light emitting unit 100 is turned on at a predetermined frequency toward the rotating body R to be measured. When the rotating frequency of the rotating body R coincides with the lighting frequency of the light emitting unit 100 The lighting frequency of the light emitting unit 100 is detected.

Next, the infrared ray radiated from the rotator R is turned on / off according to the ON / OFF operation of the infrared ray receiving unit 200 at the same period as the lighting period of the lighting frequency of the light emitting unit 100 detected in the frequency detecting step ON / OFF The temperature is measured by sensing every cycle.

Specifically, as shown in FIG. 6, the rotating body R is rotated at a predetermined rotation frequency N1 [Hz] (S100), and the light emitting unit 100 is turned on at a predetermined frequency N2 [Hz] It is determined whether the afterimage of the rotating body R is stopped (N1 = N2) (S300). If the afterimage of the rotating body R is in the stopped state (N1 = N2) The temperature is measured in a state in which the lighting frequency N2 [Hz] of the light emitting portion 100 is equal to the ON / OFF operating frequency of the light receiving portion (S400).

On the other hand, if the afterimage of the rotating body R is not in the stopped state (N1 = N2), the number of lighting frequencies N2 [Hz] of the light emitting portion 100 is adjusted (S350) The temperature is measured in a state in which the lighting frequency N2 [Hz] of the light emitting unit 100 is matched with the ON / OFF operating frequency of the light receiving unit after the state (N1 = N2)

The start point of the light emitting unit 100 and the start point of the infrared light receiving unit 200 coincide with each other so that the OFF start point of the infrared light receiving unit 200 is shorter than the end point of the light emitting unit 100 Make it fast.

Meanwhile, in the temperature measurement step, a plurality of infrared ray receiving units 200 may be provided, and each infrared ray receiving unit 200 senses infrared rays radiated from different positions of the rotating body R, It is possible to measure the temperature distribution of the rotating body R by the position based on the infrared rays detected by the infrared ray receiving unit 200.

Although the present invention has been described with reference to the preferred embodiments thereof with reference to the accompanying drawings, it will be apparent to those skilled in the art that many other obvious modifications can be made therein without departing from the scope of the invention. Accordingly, the scope of the present invention should be interpreted by the appended claims to cover many such variations.

100:
200: Infrared ray detector
300:

Claims (10)

A frequency detecting step of detecting a lighting frequency of the light emitting unit at a time point when the rotation frequency of the rotating body and the lighting frequency of the light emitting unit coincide with each other to light the light emitting unit toward the rotating body to be measured at a predetermined frequency;
An infrared detecting step of detecting infrared rays radiated from the rotating body every ON / OFF cycle as the infrared ray receiving unit is turned ON / OFF at a cycle equal to the cycle of the lighting frequency of the light emitting unit detected in the frequency detecting step; And
And a temperature measurement step of measuring a temperature based on infrared rays detected in the infrared detection step,
In the infrared detection step,
Wherein the plurality of infrared ray receiving units are provided, and each of the infrared ray receiving units detects infrared rays radiated from different positions of the rotating body. The method according to claim 1,
In the infrared detection step,
And the ON start point of the infrared light-receiving unit coincides with the start point of time of the light-emitting unit. 3. The method of claim 2,
In the infrared detection step,
Wherein an OFF start point of the infrared light-receiving unit is faster than a light-off end point of the light-emitting unit. delete The method according to claim 1,
In the temperature measurement step,
Wherein the temperature distribution of each rotating body is measured based on the infrared rays detected by the respective infrared ray receiving portions. A light emitting unit that emits light of a predetermined frequency toward a rotating body to be measured;
An infrared ray receiving unit for detecting infrared rays radiated from the rotating body;
A frequency detecting module for detecting a lighting frequency of the light emitting unit in a state in which the lighting frequency of the light emitting unit is adjusted to coincide with the rotation frequency of the rotating body; And a control unit including a light receiving unit control module for turning on and off the infrared light receiving unit and a temperature measuring module for sensing the temperature of infrared rays received by the infrared light receiving unit during the ON /
Wherein a plurality of the infrared ray receiving units are provided, and each of the infrared ray receiving units detects infrared rays radiated from different positions of the rotating body. The method according to claim 6,
The light-receiving unit control module of the control unit,
And controls to match the start point of time of the light emitting unit and the start point of the infrared light receiving unit. 8. The method of claim 7,
The light-receiving unit control module of the control unit,
Wherein the control unit controls the OFF start point of the infrared light-receiving unit to be faster than the end point of lighting of the light-emitting unit. delete The method according to claim 6,
The temperature measuring module of the control unit may include:
Wherein the temperature distribution of the rotating body is measured based on the infrared rays detected by the respective infrared ray receiving units.

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