JP2005180989A - Motor-operated valve diagnostic method and its device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor-operated valve diagnostic method and a motor operated-valve diagnostic device, capable of diagnosing even in the middle of operation, and also with few measurement errors. <P>SOLUTION: The motor operated valve diagnostic method and device for the same are for diagnosing the abnormality of the motor operated valve which is operated by rotary driving force of a driving motor mechanically transmitted to the valve. The timing of on/off of the driving energy of the driving motor 1 is determined based on the signal detected by a plurality of magnetic sensors 16... attached on the outside of the conduit pipe 15 housing the electric wires 14 for driving the motor 1 or control wires. The timing of on/off of the driving energy of the driving motor, at the time of opening/closing the valve can be correctly confirmed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a motor-operated valve diagnosis method and a motor-operated valve diagnostic apparatus that can diagnose a motor-operated valve without disassembling a motor-operated valve driving device or the like when diagnosing the motor-operated valve.

  Conventionally, in a plant such as a nuclear power plant, many motor-operated valves are used for various pipes. Ensuring the soundness of such a motor-operated valve is very important for ensuring the safety of the plant. An appropriate inspection cycle is set in consideration of the operation time, the number of operations, etc., or based on past performance, etc., and the valve is inspected systematically to obtain the expected results.

  However, in such inspection methods for disassembling the valve, it is necessary to disassemble the unnecessary part of the valve when disassembling the valve. There is concern about damage. Further, when many motor-operated valves are targeted, the labor of disassembling work increases dramatically, and it is difficult to secure skilled workers.

  On the other hand, in recent years, an inspection method for detecting an abnormality of a motor-operated valve without undergoing such disassembly of the valve has been proposed. These detect valve opening / closing time, valve drive torque, stem nut wear, etc., and determine abnormalities in each part, but torque setting is one of the important inspection items for such motorized valves. There is a value check.

  In such a motor-operated valve, a torque switch is provided in order to ensure a reliable opening and closing force and prevent the valve from being damaged due to excessive driving force when the motor-operated valve operates. The torque switch is operated in conjunction with the axial movement of the worm shaft, and the drive energy of the motor that drives the motor-operated valve is turned off.

  Therefore, the diagnosis of whether the operation of the torque switch is proper is performed by detecting the torque value (referred to as the torque setting value) at the time when the drive energy is turned off and comparing it with the specified value to determine whether it is good or bad. Yes.

  According to the standard (JEM1446), in such a diagnosis of the motor-operated valve, it is determined that the measured value of the torque setting value needs to be within a range of ± 10% of the design value, and the measured value is ± 10% of the design value. If it exceeds%, it is determined that there is an abnormality in the motor-operated valve because an appropriate holding force cannot be secured in the closed (or open) state of the valve.

In the field of the motor-operated valve, the following method is used as a method for determining when the drive energy is turned off.
(1) A method of measuring a current value by attaching a clamp meter to a single phase wire of a power cable. (For example, refer nonpatent literature 1 and patent literature 1.)
(2) A method of detecting by attaching a clamp meter to a power cable (for example, see Patent Document 2).
(3) A method of detecting by attaching a magnetic sensor on a motor (for example, see Patent Document 2).
Japan Society for Precision Engineering Intelligent Mechatronics Research Subcommittee, September 21, 1995 (Figure 14 on page 14, Table 2 on page 15) Japanese Unexamined Patent Publication No. 1-128561 (FIG. 1) Japanese Patent No. 3411980 (Japanese Patent Laid-Open No. 2002-130531) (FIG. 1, paragraph 0025, etc.)

  However, the motor-operated valve diagnostic apparatus described in Non-Patent Document 1 or Patent Document 1 can accurately measure the cutting time of drive energy, but remove the cover of the electric box to attach the clamp meter to the wire to be measured. It is necessary. Here, a cable terminal block, a torque setting mechanism, and the like are close to the wire to be measured in the electric box. For this reason, it is difficult to carry out during plant operation. Further, since this method involves removing the cover, the problem of safety and other equipment damage cannot be solved.

  On the other hand, since the apparatus described in Patent Document 2 is a temporary method of attaching a clamp meter to a power cable or attaching a magnetic sensor to a motor, it has a feature that diagnosis is possible even during plant operation. ing. However, the apparatus described in Patent Document 2 has a problem that the determination error of the obtained drive energy off time is large.

  Incidentally, FIG. 3 shows the relationship between the driving energy and the torque value when the magnetic sensor is attached to the motor.

  As is apparent from this figure, when the torque value increases rapidly, the torque value changes by about 10% or more in a half cycle time of drive energy. Even after the drive energy is cut off, the motor continues to rotate due to the inertial force, and a gradually reduced induced current flows. For this reason, the timing at which the drive energy is cut off cannot be accurately read, and the torque set value deviates from the allowable value with a reading error of about a half cycle. Therefore, when the magnetic sensor is attached to the motor and the drive energy turn-off timing is measured, the determination of when the drive energy turn-off time is different for each measurement, and it differs depending on the measurer. It causes errors and is not practical.

  In addition, when attaching a clamp meter to a power cable and measuring without opening the electric box of the motorized valve (during operation, etc.), it is necessary to measure from the outside of the conduit through which the power cable passes. When measuring with a clamp meter attached to the conduit, it is impossible to attach (clamp) to the single-phase wire from the outside of the conduit, and each phase will be clamped and measured. Therefore, it is not possible to collect sufficiently large signal information.

  Accordingly, an object of the present invention is to provide a motor-operated valve diagnosis method and a motor-operated valve diagnosis apparatus that can perform diagnosis even during plant operation without opening an electric box of the motor-operated valve and have a small measurement error.

  The inventors of the present invention were able to collect clear signal information by measuring the magnetic sensor using a Hall element instead of the clamp meter directly attached to the conduit.

  However, in the case of a single sensor, the signal information may be hidden by noise in the height of the required measurement waveform. In such a case, the timing of driving energy on / off may be collected by noise. It becomes difficult. Even if there is no noise, if the drive current on / off timing is at the position of the signal waveform near the drive energy value 0, the detection of the on / off timing may be unclear.

In addition, the power cable is arranged in the electric conduit, and the arrangement thereof is usually unknown, and the position is not fixed in the electric conduit. Furthermore, the conduit near the motor-operated valve is usually a universal tube (electrical insulation protection tube or flexible conduit). When maintenance work such as overhaul of the motor-operated valve is performed, the power cable in the conduit is There is also a possibility to move. Therefore, there may be a case where it is impossible to detect a highly accurate timing with the sensitivity required for diagnosis of the motor-operated valve with only one sensor.
Therefore, when the number of magnetic sensors is set to a plurality, there is a difference in the signal waveforms obtained from the plurality of magnetic sensors due to the difference in relative positional relationship between each magnetic sensor and each electric wire (having a phase difference). It was confirmed that the drive energy on / off timing can be accurately grasped by the signal obtained by any of the magnetic sensors.

  It was also recognized that the drive energy on / off timing can be accurately grasped by calculating each signal information obtained from a plurality of magnetic sensors.

  That is, the motor-operated valve diagnosis method of the present invention is a motor-driven valve diagnosis method for diagnosing the degree of abnormality of the motor-operated valve that mechanically transmits the rotational driving force of the drive motor and drives the valve body to open and close. The drive energy ON / OFF timing is diagnosed by using signal information output by a plurality of magnetic sensors externally attached to the outside of a conduit containing a power line or a control line for driving the drive motor. And

Further, the motor-operated valve diagnostic apparatus according to the present invention is a motor-operated valve diagnostic apparatus that diagnoses the degree of abnormality of the motor-operated valve that mechanically transmits the rotational driving force of the drive motor and drives the valve body to open and close.
A plurality of magnetic sensors externally attached to the outside of the conduit that houses the power line or control line for driving the drive motor, and output means for outputting each signal information detected by the magnetic sensor. Feature or
In the motor-operated valve diagnosis device that diagnoses the degree of abnormality of the motor-operated valve that mechanically transmits the rotational driving force of the drive motor and drives the valve body to open and close,
A plurality of magnetic sensors externally attached to the outside of a conduit for storing a power line or a control line for driving the drive motor, and the degree of abnormality of the motor-operated valve based on each signal information output from the magnetic sensor Diagnostic means for diagnosing and output means for outputting a diagnosis result obtained by the diagnosing means.

  According to such a motor-driven valve diagnosis method or motor-operated valve diagnosis device, the drive energy on / off timing of the drive motor can be measured by a magnetic sensor externally attached to the conduit, so that diagnosis can be performed even during plant operation. is there. Further, by detachably fixing (for example, externally attaching) the magnetic sensor to the outer periphery of the conduit, this diagnosis can be performed freely even for the motor-operated valve in operation.

  Further, according to such a motor-driven valve diagnosis method or diagnosis apparatus, since different sensor signals can be obtained by a plurality of externally attached magnetic sensors, (A) analysis can be performed from among the output sensor signals. Select and analyze optimal signal information, (B) Perform arithmetic processing such as addition, subtraction, and absolute value addition for each output sensor signal, select and analyze the obtained calculation results, etc. Thus, it is possible to select and carry out the analysis method that is most advantageous for accurately grasping the drive energy on / off timing of the drive motor.

  Here, (A) The following analysis method is illustrated as a method of selecting and analyzing signal information optimal for analysis from each sensor signal.

  (A)-(1) When the output of multiple magnetic sensors includes both cases where the waveform of the sensor signal at the time when the drive motor drive energy is turned on and off is mixed with noise and not Then, an output result (sensor signal) that does not intersect with the noise is selected and analyzed. Here, the case of not intermingling with noise is a case where the absolute value of the wave height of the signal when the drive energy of the drive motor is turned on / off is higher than the absolute value of the noise.

  Thus, among the output results from a plurality of magnetic sensors, an example in which the waveform of the sensor signal may or may not intersect with noise is the relative positional relationship between each magnetic sensor and each electric wire (having a phase difference). Therefore, there is a difference in signal waveforms obtained individually from the plurality of magnetic sensors. Among each sensor signal, a sensor signal having a waveform that can clearly determine the drive energy on / off time of the drive motor is selected.

  (A)-(2) Among the output results from a plurality of magnetic sensors, if the S / N ratio of the sensor signal is large or small, a sensor signal with a large S / N ratio is selected, and the sensor signal Analyzes the drive energy on / off timing of the drive motor. In this case, there is a high possibility that the analysis error of the driving energy on / off timing of the driving motor is reduced as compared with the case where a sensor signal having a small S / N ratio is selected.

  One magnetic sensor when the number of opening and closing operations is small (about once a month) and the number of opening and closing operations for inspection is limited due to working conditions, as in the case of major motorized valves at nuclear power plants, etc. It is impractical to open and close many times in order to change the mounting position of the sensor and identify the sensor position with the maximum S / N ratio. For this reason, there is a merit of simultaneous mounting of a plurality of sensors. Moreover, a flexible wire etc. are used for the conduit connected to a motor operated valve around the connection part to a motor operated valve. For this reason, the relative position between the position of the power cable in the conduit and the outer periphery of the conduit is not always constant. Therefore, even if the optimum position of the sensor is specified and marked, the optimum position may change due to a change in the relative position until the next measurement. However, when the positional relationship between the sensor and the electric wire is maintained, such as when the conduit is fixed, the selected sensor is always different if (A)-(2) is selected as the analysis method. Since the S / N ratio is expected to be larger than the other sensors, the other sensors are not required for the next and subsequent measurements. Therefore, in the first measurement, it is necessary to attach all the sensors. However, in the next and subsequent measurements, it is expected that the same result can be obtained even if the sensor that was not adopted is removed and measured.

  In this case, in the method for diagnosing the degree of abnormality of the electric valve that mechanically transmits the rotational driving force of the driving motor and drives the valve body to open and close, the timing of driving energy on / off of the driving motor is determined by: Output as signal information by a magnetic sensor externally attached to the outside of the conduit containing the power line or control line that drives the drive motor, and from the output results, among the signal information output by each of the plurality of sensors, Motorized valve diagnosis that marks the position of a magnetic sensor that outputs signal information with a large S / N ratio, and uses the signal information output from the magnetic sensor attached to the marking position for diagnosis of the motorized valve after the next time. A method is possible.

  The position at which the S / N ratio of the sensor among the plurality of magnetic sensors is the largest is confirmed only after measurement.

  According to the present invention, it is possible to provide a motor-driven valve diagnosis method and a motor-operated valve diagnosis apparatus that can perform diagnosis even during plant operation without opening an electric box of the motor-operated valve and reduce measurement errors.

  Hereinafter, specific embodiments of the motor-operated valve diagnosis method and motor-operated valve diagnosis apparatus according to the present invention will be described with reference to the drawings. In addition, the same or equivalent part member as the prior art is assigned the same number, and detailed description is omitted.

  First, in the motor-operated valve according to the present invention, as shown in FIG. 1, the drive motor 1, the gear 2, the worm 3, the worm gear 4, the drive sleeve 5, the stem nut 6, the stem 7 (valve rod), the valve body 8, etc. A drive mechanism and a transmission mechanism are provided.

  Further, in such a motor-operated valve, as shown in FIG. 2, it is driven with a torque spring cartridge (TSC) 10 including a disc spring 11 that expands and contracts in response to a reaction force acting in the axial direction (x direction) of the worm 3. A torque switch 12 for commanding on / off of driving energy of the motor is provided. The TSC 10 is set so that the torque switch is activated when the worm shaft 3a moves by a predetermined width or more in the x direction for compressing the disc spring 11.

  As a result, the rotation of the drive motor 1 is transmitted to the gear 2 and the worm 3, and the worm gear 4 is further rotated as a rotational kinetic force (torque). Next, the stem 7 moves up and down via a stem nut 6 in the drive sleeve 5 rotated together with the worm gear 4. Thereby, as shown in FIG. 1, the valve body 8 fixed below the stem 7 is moved up and down to open and close the valve.

  Here, the amount of movement of the worm shaft 3a, that is, the amount of compression of the disc spring, is proportional to the compression force of the disc spring 11, according to the Hooke's law, and further, the compression force of the disc spring 11 is proportional to the torque. Since it is proportional to the contact force that contacts the seat, the contact force that causes the valve element 8 to contact the valve seat by cutting off the energization to the drive motor when the worm shaft 3a is in a predetermined position is a predetermined value. Can be regulated.

  That is, in the valve closing operation, the valve body 8 is pushed downward as the stem 7 is lowered, and the passage of the pipe 200 is closed. When the valve body 8 comes into contact with the valve seat, the valve is completely closed and the valve body 8 reaches the limit of the closing operation, the stem 7 does not descend further, so the worm gear 4 also rotates further. Without stopping, the descending of the stem 7 stops, but the drive motor 1 continues to rotate. As a result, the worm 3 continues to move in the x direction, and the disc spring 11 is pressed. The compression force for compressing the disc spring 11 is proportional to the torque for obtaining the contact force with which the valve body 8 keeps contacting the valve seat, and the compression force (F) × constant (L) of the disc spring is “torque value”. As measured by an appropriate sensor.

  In the motor-operated valve diagnostic apparatus according to the present invention, a power line for driving the drive motor is housed in the conduit 15 and connected to the drive motor 1. A magnetic sensor 16 using a Hall element is fixed to the outer peripheral surface of the conduit 15.

  The number of the magnetic sensors 16 is not limited to one as shown in FIG. 4, but may be two or more as shown in FIGS. 5 to 6, and a plurality of magnetic sensors 16 are preferably provided as will be described later. .

  Here, the magnetic sensor 16 is a driving energy sensor for detecting on / off of driving energy of the driving motor 1, and in FIG. 5 or FIG. 6 (a), two magnets indicated by reference numerals 16A and 16B. The sensor is fixed, and in FIG. 6B, three magnetic sensors indicated by reference numerals 16A to 16C are fixed. Other configurations are the same as or equivalent to those of the conventional motor-operated valve diagnostic apparatus.

  Here, as shown in FIG. 7, the magnetic sensor using the Hall element is perpendicular to the direction in which the current I flows and the direction of the magnetic field H when the magnetism is sensed in a state where the current I is applied. It is a sensor that senses a voltage E generated in the direction.

  These magnetic sensors 16 are disposed on the outer peripheral surface 15a of the conduit 15 as shown in FIG. In this case, an appropriate adapter may be used so that the mounting position of the magnetic sensor can be maintained.

  When a plurality of magnetic sensors 16 are fixed, the magnetic sensors 16 are preferably fixed at equal intervals on an outer peripheral surface 15a in a plane orthogonal to the axis O15, as shown in FIGS. In FIG. 6B, the angle θ between the magnetic sensors 16A to 16C and the axis O15 is 120 degrees (the interval between the magnetic sensors 16A to 16C is equal). The distance is fixed.

  Here, each magnetic sensor 16 can be fixed to the outer peripheral surface of the conduit 15 by appropriate fixing means 17 (FIG. 5) such as a hook-and-loop fastener tape. The fixing means 17 is not particularly limited. For example, if the fixing means 17 is a detachable structure such as a hook-and-loop fastener tape, it can be easily attached and detached, and a plurality of magnetic sensors 16 (16A to 16) can be attached. Once installed and once measured, it can be easily removed and used to diagnose another motorized valve.

  Next, measurement of the current flowing in the power cable 14 inserted into the conduit 15 by the magnetic sensor 16 configured as described above will be described.

  As shown in FIG. 4, the power cable 14 is composed of three wires denoted by reference symbol UVW, and a three-phase alternating current flows in each of the wires UVW (U-phase wire, V-phase wire, and W-phase wire). Yes.

The plurality of magnetic sensors 16 are fixed to an arbitrary position on the outer peripheral surface 15a of the conduit 15 so that the magnitude of magnetic lines of force in the tangential direction of the conduit 15 can be measured, and the Hall element center O16 (P) in the magnetic sensor 16 is measured. The magnitude of the passing magnetic field lines is measured.
In accordance with the laws of electromagnetism, simulation (calculation) is performed by varying the number of magnetic sensors and the positional relationship with the power cable, and the effectiveness of the present invention is shown.
Here, the power cable 14 is assumed to be a straight line extending in the longitudinal direction indefinitely. Further, according to Ampere's law, the magnetic field H (t) created by the linear current I at a distance r is I / 2πr, that is, H (t) = I / 2πr.

Also, as shown in FIG. 8, the coordinate system has an origin O14 of the cable cable as the origin, the position of the axis O15 of the conduit 15 is (x ₀ , y ₀ ), the Hall element center O16 (P) and the wire When the distance from the axis O15 of the tube 15 is R and the wire UVW is at the apex of an equilateral triangle having the distance from the axis O14 of the power cable 14 as r, it is measured by the magnetic sensor 16 at the point P. The magnetic field H (t) in the tangential direction is obtained by the formula I.

In the drawing, ξ is the cable angle formed by the straight line connecting the wires U and O14 with the x axis, θ is the sensor angle formed by the straight line connecting the magnetic sensor and the axis O15 with the x axis, and φu is the magnetic sensor and the wire U. The angle formed by the straight line connecting the centers of the x axis and the x axis (the same applies to φv and φw) is shown.
α = 2π / 3 (the angle of each other of the electric wires UVW around the coordinate origin = 120 °).
Point P coordinates (x, y) = (Rcosθ + xo, Rsinθ + yo)
Coordinates of point U (xu, yu) = (rcosξ, rsinξ)
Point V coordinate (xv, yv) = (rcos (ξ + α), rsin (ξ + α))
Point W coordinates (xw, yw) = (rcos (ξ + 2α), rsin (ξ + 2α))
Distance between points P and U ru = √ ((x−xu) ^ 2 + (y−yu) ^ 2)
Distance between points P and V rv = √ ((x−xv) ^ 2 + (y−yv) ^ 2)
Distance between points P and W rw = √ ((x−xw) ^ 2 + (y−yw) ^ 2)
The angle between the straight line passing through points P and U and the X axis φu = tan-1 ((y−yu) / (x−xu))
Angle that the straight line passing through points P and V makes with the X axis φv = tan-1 ((y−yv) / (x−xv))
Angle that the straight line passing through points P and W makes with the X axis φw = tan-1 ((y−yw) / (x−xw))
Current Iu (t) = Isin (ωt−α), where ω is the AC frequency f × 2π
Current flowing through wire V Iv (t) = Isin (ωt)
Current Iw (t) = Isin (ωt + α) flowing through the wire W
Then, as shown in FIG. 8, since the magnetic field Hu (t) ′ = Iu (t) / 2πru created by the wire U at the point P, the tangential magnetic field Hu (t) = Hu (t) ′ · cos (θ−φu) = (Iu (t) / 2πru) · cos (θ−φu),
Similarly, tangential magnetic field Hv (t) = Hv (t) '· cos (θ-φv) = (Iv (t) / 2πrv) · cos (θ-φv), electric wire W The magnetic field in the tangential direction created at point P is Hw (t) = Hw (t) ′ · cos (θ−φw) = (Iw (t) / 2πrw) · cos (θ−φw).

Here, since the magnetic field H (t) to be obtained is the above composition, the magnetic field H (t) is expressed by Formula I.
H (t) = I / 2π × [sin (ωt−α) ・ cos (θ−φu) / ru + sin (ωt) ・ cos (θ−φv) / rv + sin (ωt + α) ・ cos (θ −φw) / rw] (Formula I)
As a result, the influence of each wire UVW on the Hall element is inversely proportional to the distance (ru, rv, rw) from the center of each wire UVW to the Hall element center O16 (P), as shown in FIG. Angles (θ−φu, θ−φv, θ−φw) formed by a line connecting 15 axis O15 and Hall element center O16 (P) and a line connecting the center of each wire UVW and Hall element center O16 It is measured as the sum total affected by the vector quantity.

  In this formula I, the position of the electric wire cable and the magnetic sensor was changed, and the magnetic sensor signal was simulated by calculation. This is to understand that the use of a plurality of magnetic sensors is effective for clearly measuring the driving energy signal OFF time.

In addition, the following simulation calculation was performed by referring to the dimensions of a standard actual machine, with R = 22.6 mm and r = 2.4 mm.
(Simulation calculation 1)
In the case of the positional relationship shown in FIG. 9C, when the signals of the magnetic sensors 16A, 16B, and 16C are taken out, as shown in FIG. There is signal information 16A and signal information 16C in which driving energy is observed to be turned off at a high position, and an off time (off timing) is measured from a sensor signal 16A or 16C based on a magnetic sensor that can be distinguished without being hidden by noise. be able to.
(Simulation calculation 2)
Next, as shown in FIGS. 9A to 9D, the power cable 14 is disposed at the center of the conduit 15, and the magnetic sensors 16 (16 </ b> A to 16 </ b> D) are respectively attached to the outer peripheral surface 15 a of the conduit 15. The situation of each sensor signal obtained in the case was simulated.

  Each magnetic sensor 16 (16A-16D) was installed so that the space | interval which mutually adjoins as an axial center center of the conduit 15 becomes equal intervals. Accordingly, in FIG. 9B, the magnetic sensor 16A and the magnetic sensor 16B are arranged point-symmetrically (shifted by 180 degrees), and in FIG. 9C, the magnetic sensors 16A to 16C are shifted from each other by 120 degrees. In FIG. 9D, the magnetic sensors 16A to 16D are arranged so as to be shifted from each other by 90 degrees. Each magnetic sensor 16 is arranged so as to be able to measure the magnetism in the tangential direction of the circumference of the outer peripheral surface 15a.

  The results are summarized and shown in graphs in FIGS. Here, the sensor signal collected by each sensor 16 (16A to 16D) is a combination of addition and subtraction, a signal indicating the maximum value is “large signal value”, and a signal indicating the minimum value is “ The signal value was “small”, and the sum of the absolute values of the respective signal values was labeled “absolute value”. The numerical value preceding the “absolute value” represents the number of sensors.

  Here, FIGS. 11 (a) to 11 (c) show the case where there are two to four sensors on the basis of the case where there is one sensor, and FIG. 11 (d) shows the sensor. The comparison results of the absolute value addition processing results of the sensor output corresponding to the number of sensors are shown.

  From these results, in the case where there are a plurality of sensors, there are cases where the sensor signals cancel each other out by the method of signal calculation (addition, subtraction), resulting in a smaller sensor signal than in the case of one sensor. On the other hand, when the sensor signals are added as absolute values, a larger sensor signal is obtained as the number of sensors increases, and the signal shape approaches a shape without undulations as compared with the case of one sensor.

This changes the sensor waveform when the drive energy is on / off (change point from the sensor signal value in the drive energy off state to the on state, or change point from the sensor signal value in the drive energy on state to the off state). Can be detected more reliably.
(Simulation calculation 3)
Next, as shown in FIGS. 12 (a) to 12 (d), the power cable 14 is arranged along the inner wall of the conduit 15, and the magnetic sensors 16 (16 </ b> A to 16 </ b> D) are respectively attached to the outer peripheral surface of the conduit 15. The situation of each sensor signal obtained in this case was simulated.

Here, the arrangement of the magnetic sensors 16 (16A to 16D) substantially conforms to FIG. The distance r ₀ from the axis O15 of the conduit 15 to the axis O14 of the power cable was 14.1 mm.

  In FIG. 12A, the power cable 14 and the magnetic sensor 16 are arranged farthest apart with the axis O15 as a point symmetry. Also, in FIG. 12B, the power cable 14 is arranged at a position equidistant from the magnetic sensors 16A and 16B arranged 180 degrees symmetrically with respect to the point. Further, in FIG. 12C, three magnetic sensors 16A to 16C are arranged so as to be shifted from each other by 120 degrees, and are located at equal intervals between the magnetic sensor 16B and the magnetic sensor 16c. The power cable 14 is arranged at a position farthest from the center of the axis about the point. Further, in FIG. 12D, among the four magnetic sensors 16A to 16D arranged so as to be shifted by 90 degrees from each other, it is an intermediate position of the magnetic sensors indicated by reference numerals 16B and 16C, and the magnetic sensors 16A and 16D. The power cable 14 is arranged at a position farthest from the intermediate position.

  The results of the simulation calculation 3 in such an arrangement are summarized and shown in graphs in FIGS. Here, the sensor signal collected by each sensor 16 (16A to 16D) is the same as the combination of addition and subtraction, the signal indicating the maximum value is “large signal value” and the signal indicating the minimum value. Is labeled “small signal value”, and the sum of the absolute values of the respective sensor signals is labeled “absolute value”. Note that the numerical value that precedes “large signal value”, “small signal value”, or “absolute value” represents the number of sensors that have undergone arithmetic processing.

  Here, in FIGS. 13A to 13C, the case of two to four sensors is compared based on the case of one sensor, and in FIG. 13D, the most reading is performed according to the number of sensors. The processing results that seem to be appropriate are compared and shown.

  From these results, the following can be understood.

  (1) Even when the minimum value is indicated by the signal calculation processing (addition or subtraction) method, the signal value is larger in the case where the number of sensors is two or more than in the case where the number of sensors is one. ing.

  (2) When there are a plurality of sensors, the signal value varies depending on the method of calculation processing (addition, subtraction, etc.), but when the sensor signals are added as absolute values, a larger signal value is obtained as the number of sensors increases. And compared with the case of one sensor, the signal shape is approaching the shape without undulations.

  This changes the sensor waveform when the drive energy is on / off (change point from the sensor signal value in the drive energy off state to the on state, or change point from the sensor signal value in the drive energy on state to the off state). Can be detected more reliably.

  In the above description, an example has been described in which a three-phase alternating current is passed through an electric cable inserted into a conduit and the drive motor is driven. However, the drive motor may be a direct current motor.

  Here, in the case of a DC motor, a pair of electric wires forming a pair in which the directions of currents are opposed are inserted into a conduit of a driving power source. As a result, even if the clamp meter simply measures from the top of the conduit, the leakage current is measured, and the S / N ratio becomes abnormally small and substantial measurement is difficult. When using a sensor, it seems possible for the same reason as described above.

  In the examples described above, the drive energy (drive current) is used. However, instead of the electric cables inserted into these electric conduits, control signal lines for controlling the driving of the motor are inserted into the electric conduits. It may be the case. Here, the present invention is to measure by fixing a magnetic sensor on the outer peripheral surface of the conduit in any case, whether the current signal flowing through the control signal line inserted into the conduit is direct current or alternating current. The diagnostic method and diagnostic apparatus can be applied as they are.

  When detecting and measuring the current flowing through the control signal line, there may be a slight time difference between the time when the control signal is issued and the time when the drive energy of the drive motor is actually cut off. . This is because, for example, as shown in FIG. 14, the power switch (contact switch) for turning on / off the power of the drive motor 1 is turned off by being induced by the electromagnetic coil in accordance with the operation of the torque switch. Therefore, it is generally simpler to detect and diagnose the drive energy of the drive motor directly than to diagnose based on the information of the control signal line that controls the power on / off of the drive motor. And it is considered accurate.

  Next, a case where the diagnosis result of such a motor-operated valve diagnosis apparatus is automatically output on the screen will be described. This motor-operated valve is a motor-operated valve diagnostic device (hereinafter abbreviated as a motor-operated valve diagnostic device based on a torque setting value) based on the torque value at the time when the drive motor drive energy is turned off. In such a motor-operated valve diagnostic device based on the torque setting value, the load (proportional to the torque value) applied to the stem 7 at the time when the drive energy for driving the drive motor 1 is cut off is the management target. The motor-operated valve is normal if the permissible value (usually ± 10%) is within the range, but if the permissible value is exceeded, the motor-operated valve is determined to be abnormal.

  Such a motor-operated valve is set so that the valve closing operation is completed after confirming that the valve body is pushed downward to maintain the state where the passage of the pipe 200 is completely closed. For this purpose, it is important whether or not the load applied to the stem 7 reaches a predetermined value in a state where the valve completely closes the passage 200 and stops descending.

  While the valve is pushed down and the passage 200 is closed, the disc motor 11 is pressed by further driving the drive motor to control the load on the stem 7 (force for closing the valve). The load on the stem 7 increases rapidly. When the compression force (proportional to the torque value) of the disc spring 7 reaches a predetermined set value, the drive motor 1 stops, whereby the load on the stem 7 (proportional to the torque value) can be maintained at the predetermined set value.

  Here, if the drive energy cutoff time cannot be accurately determined, it is substantially difficult to manage with the load on the stem 7 that increases rapidly. When the load applied to the stem 7 (proportional to the torque value) increases rapidly (eg, the torque value increases by 10% or more at 10 ms), there is a slight error of about 10 milliseconds at the drive energy cutoff time. However, an error of 10% or more occurs in the torque setting value, and there is a possibility that the diagnosis for the allowable value determined as the reference value ± 10% cannot be performed accurately.

  In the motor-operated valve diagnostic apparatus 100 provided with this automatic output device, a plurality (eg, three or four) of magnetic sensors 16 are fixed to the outer peripheral surface 15 of the conduit 15. Further, a stress sensor is fixed at an arbitrary position such as the stem 7, the yoke 7 ', the torque spring cartridge 10, etc., and the stress proportional to the compressive force of the disc spring 11 can be measured over time by this stress sensor.

  As shown in FIG. 15, the information of each sensor is input to a diagnosis unit 70 having a storage unit such as a hard disk of a computer, and the result calculated by the diagnosis unit 70 is a monitor 81, a printer 82, and other external outputs 83. Is output by output means such as

  Here, in this diagnostic means 70, each input sensor signal is subjected to addition processing with an absolute value. Further, as shown in FIG. 16, the sensor signal subjected to the addition process is processed by a “threshold value” set at a position slightly higher than the noise. In such a “threshold value”, since the number of magnetic sensors 16 is large, the sensor signal (signal information) subjected to the addition processing of the absolute value is always higher than the “threshold value” when the drive motor 1 is on. A signal is being output.

  Thus, the time when the sensor signal (signal information) exceeds the “threshold value” is stored as the time (start time) A when the drive motor 1 starts driving, and the time when the sensor signal falls below the “threshold value”. Is stored as time (stop time) B when the drive motor 1 stops driving.

  The diagnosis means 70 measures the start time A when the drive motor 1 starts driving and the stop time B when the drive motor 1 stops driving, and sets the stress sensor value at the stop time B when the drive motor 1 stops driving. It is determined whether or not the torque setting value based is within an allowable range.

  In this way, diagnosis is performed in accordance with a conventional method by comparing various calculation results based on the sensor signal with the numerical values of the predetermined reference table (LUT) 71. If each result of the arithmetic processing is within a predetermined range, it is determined as “no abnormality”, and if it exceeds a predetermined value, it can be determined as “abnormal”.

  If each result of the arithmetic processing is abnormal, deterioration or failure is expected, and this is notified to output means such as the monitor 81, printer 82, external output 83, and the like. The output result may be, for example, “failure mode” or “deterioration mode”. In the case of external output, it may be received in a remote area via any communication means (including telecommunication lines such as the Internet).

  In any of the diagnosis results, the information on the torque set value related to the drive stop of the drive motor 1 is accurate, or the calculation information related to the change point of the drive energy is accurate, so that the reliability can be improved. A certain diagnostic result can be obtained. About another structure and an effect, it is the same thru | or equivalent to a prior art example and a prior art.

  In the above description, only the on / off timing of the drive energy is detected. However, under the condition that the positional relationship between the magnetic sensor and the electric cable placed in the conduit is fixed, Ampere's law Because a magnetic field H is generated in proportion to the current flowing through the electric cable, the use of a quantitative magnetic sensor as the magnetic sensor not only measures the drive energy on / off timing of the drive motor, but also changes the drive energy. It is easily understood that the method and apparatus of the present invention can be used in combination with a motor-driven valve diagnostic method or apparatus for observing the above situation.

  For example, the motor-operated valve diagnostic apparatus of the present invention can be applied to a diagnosis using a change in drive energy of a drive motor.

  An example of using a change in driving energy for diagnosis of a motorized valve is, for example, “Report on Intelligent Mechatronics Research Subcommittee” Vol. 2, No. 2, published by the Japan Society for Precision Engineering, reported on September 21, 1995. This is described in items 1, 2, 18 on page 15. Here, it is explained that item 1 is related to motor load (startup / running / overload), item 2 is related to motor load / running torque, and item 18 is related to torque sheet current. It has been suggested that changes can be detected and thereby diagnosed.

  Thereby, in the motor-operated valve diagnostic apparatus of the present invention, the change in the absolute value of the drive energy of the drive motor is compared with the normal state under the condition that the arrangement of the electric cable or control line in the conduit 15 is fixed. Therefore, it is considered possible to diagnose the presence or absence of abnormality.

  In the above description, the on / off timing of the drive energy of the drive motor has been described in association with the torque setting value based on the stress sensor value, but the present invention is not limited to this.

  In addition, according to the method of using signal information output from a plurality of magnetic sensors attached to the outside of the conduit of the present invention, the drive energy on / off timing of the drive motor can be accurately measured. Obviously, the present invention may be applied to other diagnostic devices that can be measured due to the timing of driving energy on / off of the inserted power cable.

  In addition, when a control line for controlling driving energy on / off of the drive motor is housed in the conduit, if the control signal flowing through the control line is a current signal, the control signal can be used regardless of whether it is AC or DC. It can be easily understood that the timing of the on / off command can be accurately detected, and the motorized valve diagnostic method and motorized valve diagnostic apparatus of the present invention can be applied to both.

  Such timing of the on / off command of the control signal can be applied to, for example, a motor-operated valve diagnosis device based on a torque setting value. In the motor-operated valve diagnostic apparatus in which the on / off command of the control signal for driving the drive motor 1 is managed by the amount of movement of the worm, a torque switch for turning off the drive motor 1 when the amount of movement of the worm reaches a predetermined value Is activated and the drive motor is stopped.

  Here, the load (proportional to the torque value) applied to the stem 7 when the torque switch issues an off command (time t) is the management target. This tolerance is usually ± 10% for the same reason as in the previous example, and if it is within the range of ± 10%, the motorized valve is normal, but if the tolerance is exceeded, the motorized valve is abnormal. It is judged. Here, if the operation time of the torque switch (off control signal transmission time) cannot be accurately determined, it is substantially difficult to manage the load on the stem 7 that increases rapidly.

  In addition, since the management with the control signal has a problem that the timing of the drive motor described later is shifted, in the present invention, the on / off timing of the drive energy for directly driving the drive motor is measured. Is preferred.

The effects of the present invention will be described below with reference to examples, but the present invention is not limited to the following examples.
(Example 1)
The signal collection state when the drive energy of the drive motor 1 is actually turned on / off is shown as a plurality (2) of the magnetic sensor position (magnetic sensor 1) and remote position (magnetic sensor 2). 17) The actual measurement data of each signal obtained by installing is shown in FIGS.

  Here, FIG. 17 shows a case where the drive energy is turned off at the set torque, and the motor load of the drive motor increases immediately before stopping, thereby increasing the drive energy and increasing the sensor signal. FIG. 18 shows a case where the torque switch is stopped by a limit switch that operates based on the valve stem position before the torque switch is activated. In this case, the torque load is stopped before the motor load increases. FIG. 19 shows data when the motor is started.

17 to 19 are data in a laboratory, and are results in a state where there is almost no noise. In general, noise often occurs for some reason. Assuming the occurrence of noise, in any case, the signal of the magnetic sensor (magnetic sensor 1) at a position close to the power cable 14 is ON of driving energy compared to the signal of the magnetic sensor (magnetic sensor 2) at a far position.・ It is understood that the off timing can be accurately grasped.
(Example 2)
Next, the case of the magnetic sensor according to the present invention will be described in comparison with the state of signal collection when the drive energy of the drive motor 1 is actually cut off.

  In Example 2, it was assumed that the operation was in progress, and the electrical box was not openable, so that the single-phase line measurement was not possible from the outside of the conduit.

  Further, the signal strength varies depending on the arrangement of the power cable 14 in the conduit 15, but in the second embodiment, a case where the cable 14 is located at the center of the conduit 15 will be described as an example. When the cable 14 is arranged in the center of the conduit 15 as described above, the signal is the smallest, and it is assumed that it is most difficult to collect a high-quality signal by the magnetic sensor. The conduit used here has an outer diameter of 42 mm and an inner diameter of 34 mm.

  Here, Fig.20 (a) is an experimental result at the time of collecting a sensor signal with two magnetic sensors 16A and 16B.

FIG. 20B is an experimental result when the conventional clamp meter described in Patent Document 2 is clamped to the conduit for comparison, and the noise level is compared with the result of FIG. 20A. The sensor output ratio is adjusted so that is substantially the same.
FIG. 20C is an enlarged view of the time axis in the vicinity where the drive energy is turned off in FIG.

  As apparent from the comparison between FIG. 20A and FIG. 20B, according to the method of the present invention using a magnetic sensor, the S / N ratio is greatly increased compared to the case of using a clamp meter. Has been improved.

  Further, as is clear from FIG. 20C, when the clamp meter is used, the waveform is disturbed due to the three-phase collective measurement, the S / N ratio is small, and the drive energy off timing is not clear. It is shown. Thereby, according to this invention, it understands that the measurement error of diagnosis of a motor operated valve can be reduced.

  In addition, when a magnetic sensor is installed on the motor, an induced current is generated due to the inertial force of the motor. Therefore, even if the drive energy is cut off, the sensor signal gradually decreases and does not stop immediately. As a result, it is difficult to accurately detect the timing of turning off the drive energy, which causes a misdiagnosis that the off determination time point position differs depending on the determiner.

  For example, in a motor-operated valve with a large torque increase speed and a high driving speed, as shown in FIG. 3, there is a difference (OFF determination error Δt) between the actual driving energy off timing and the driving energy off timing. Here, in the diagnostic device in which the allowable value of the torque setting value (torque value at the time when the drive energy is OFF) in the reference table LUT or the like is set to the reference value ± 10%, the timing of the OFF determination is slightly different. Diagnostic errors cannot be ignored.

  On the other hand, in the method of setting a plurality of magnetic sensors according to the present invention, the difference (OFF determination error Δt) between the actual drive energy off timing and the drive energy off timing is reduced or substantially eliminated.

The following can be understood from the results of the above simulation and the examples.
(1) By a simple method of installing a plurality of magnetic sensors using Hall elements in a conduit, the S / N ratio is significantly larger than when using a clamp-type ammeter, Without removing the cover of the electric box of the motor-operated valve, it is possible to grasp the driving energy on / off timing more accurately.
(2) When a plurality of magnetic sensors are installed, by adopting a method of adding absolute values of signals obtained from the sensors, a larger signal value can be obtained as the number of sensors increases, and the sensor 1 Compared to the individual case, the signal shape is closer to a shape without undulations. This changes the sensor waveform when the drive energy is on / off (change point from the sensor signal value in the drive energy off state to the on state, or change point from the sensor signal value in the drive energy on state to the off state). Can be detected more reliably.
(Example 3)
Next, as an abnormality information, an embodiment will be described in which an abnormality is detected using a state in which the stem (valve rod) 7 is bent as a time-series change in driving energy.

  There is a difference between the drive energy required for the drive motor 1 in a normal state where the stem 7 is not bent and the drive energy required for the drive motor 1 in a bent state, and the drive energy when bent is considered to increase. It is done. Therefore, by comparing with the temporal change data of the driving energy in the normal state, it is possible to detect an abnormality due to the stem 7 being bent or the like.

  Here, when the stem 7 is bent, it is considered that the worm load, the worm displacement, and the valve stem stress increase or displace in addition to the driving energy (motor current). Therefore, as shown in FIG. 21, the influence on the driving energy and the like when the stem 7 is actually bent by about 0.9 degrees was measured, and the measurement results are shown in FIGS.

  Here, FIG. 22 shows the measurement results when the stem 7 and the valve body 8 are operated in the opening direction, and FIG. 23 shows the measurement results when the stem 7 and the valve body 8 are operated in the closing direction. From these figures, when the stem 7 is bent (shown as “abnormal”), the change in the waveform of the driving energy (motor current) can be clearly observed as compared with the normal state. In addition, it can be understood from these figures that the measurement is clear without being inferior even when compared with measurements by worm load (torque), worm displacement (worm), and valve stem stress (valve shaft thrust). These results suggest that reading with a magnetic sensor is possible.

  Next, an example of diagnosis using the motor-operated valve diagnosis apparatus will be described. This example is an example in which the present invention is applied to a motor-operated valve or a motor-operated valve diagnostic device set for various pipes in a nuclear power plant, for example.

  This electric valve (electric valve diagnostic device 100) is substantially the same as or equivalent to the device shown in FIG.

  An example of the diagnostic information of the motor-operated valve when such a valve body 8 is closed is shown in FIG. In this figure, the change over time of the operating torque of the drive motor 1 between the start of the motor and the interruption of the drive energy is represented by a graph.

  When the drive motor 1 is driven, the worm 3 rotates, the worm gear 4 meshed with the worm 3 rotates, and the worm gear 4 rotates by a predetermined angle, the protrusion of the worm gear 4 presses the protrusion of the drive sleeve 5 (hammer hitting). Then, the drive sleeve 5 rotates. That is, the operating torque of the drive motor 1 rises once and idles until hammering (until the worm gear 4 rotates and the protrusion of the worm gear 4 abuts the protrusion of the drive sleeve 5 to rotate the drive sleeve 5). Although the torque is small, the stem 7 is then lowered under a constant torque.

  When the valve body 8 comes into contact with the valve seat, the valve body 8 starts to be narrowed, and the worm shaft 3a moves in the x direction that presses the disc spring 11, and the torque value increases. When the worm shaft 3a moves to a predetermined amount of displacement, the torque switch 12 is activated to cut off the drive energy to the drive motor 1. Here, in FIG. 24, although an overshoot of the torque value is observed immediately after the torque switch 12 is operated, the holding torque is maintained thereafter.

  In the present invention, it is possible to accurately confirm the on / off timing of the drive energy of such a motor-operated valve diagnostic device, and in the present invention, the sequential change of the drive energy of such a motor-operated valve diagnostic device. Therefore, it is easily understood that the present invention can be applied to such a motor-operated valve diagnostic apparatus.

  Although the present invention has been described in detail above, the specific configuration is not limited to the above description, and design changes and the like within the scope not departing from the gist of the present invention are also included in the present invention.

  In nuclear power plants and the like, motorized valves are widely used, and maintaining the soundness of the motorized valves is very important for ensuring the safety of the plant. In such a motor-operated valve, a state monitoring and maintenance technique using a motor-operated valve diagnostic device has already been put into practical use as a more effective maintenance technique compared to time-planned maintenance in which overhauls and the like are performed at regular intervals. Such a motorized valve diagnostic device attaches a sensor for detecting the state to the motorized valve, collects and analyzes sensor output (signal information), and diagnoses the set torque and the amount of wear of each part. Introduction of high diagnostic technology is desired.

  According to the present invention, it is possible to provide a high-performance motor-operated valve diagnostic apparatus that can realize high accuracy, low cost, and labor saving, and is considered to be widely applicable industrially.

  In addition, the motor-operated valve of the present invention can be combined with an unattended data collection device using a pre-trigger method and a remote bidirectional communication system. By starting the data collection device using the drive energy as a trigger signal, it is possible to collect data without malfunctions, and to save labor in collecting data and to enable advanced diagnosis quickly without having to go to the site. There is expected.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram explaining an example of the electrically operated valve diagnostic apparatus which implements the electrically operated valve diagnostic method based on this invention, (a) is a principal part perspective view, (b) is a longitudinal cross-sectional view of a drive sleeve part. It is a principal part expanded block diagram of the motor operated valve of FIG. It is a figure which shows the relationship between the drive energy at the time of attaching a magnetic sensor to a motor, and a torque value. It is a figure explaining the situation of the arrangement of the power cable in the electric pipe in the electric valve diagnostic device concerning the present invention, and the attachment situation of the magnetic sensor to the electric pipe by a cross section. It is a figure explaining the situation of arrangement of an electric power cable in a conduit tube in the motor-operated valve diagnostic device concerning the present invention, and the attachment situation of a magnetic sensor to a conduit tube by a longitudinal section. 6 (a) and 6 (b) are diagrams for explaining the state of attachment of the magnetic sensor to the conduit in the motor-operated valve diagnostic apparatus according to the present invention. It is a circuit diagram of the magnetic sensor using the Hall element concerning the present invention. It is explanatory drawing which estimates the magnetic field which generate | occur | produces from the electric power cable penetrated in the conduit with the magnetic sensor which concerns on this invention. FIGS. 9A to 9D are layout diagrams for explaining the relationship between the power cable and the magnetic field sensor. It is the figure which showed typically the signal obtained from the magnetic sensor attached so that a phase difference might produce according to this invention. 11 (a) to 11 (d) show the results of computing the output signals output from the magnetic sensor when current flows through the power cables arranged according to the layout diagrams of FIGS. 12 (a) to 12 (d). FIG. 12A to 12D are layout diagrams for explaining the relationship between the power cable and the magnetic field sensor. FIGS. 13A to 13D show the results of arithmetic processing of the output signal output from the magnetic sensor when current flows through the power cables arranged according to the layout diagrams of FIGS. 12A to 12D. FIG. It is a circuit diagram explaining the relationship between a torque switch and a drive motor. It is a figure explaining the system configuration example at the time of making an electric valve diagnostic apparatus into an automatic determination apparatus. It is a figure explaining the "threshold value" set in a diagnostic means. It is a figure explaining the actual measurement data of the sampling condition of a signal when the drive energy of a drive motor turns off by a setting torque value. It is a figure explaining the measurement data of the sampling condition of the signal when the drive energy of a drive motor is stopped by a limit switch. It is a figure explaining the actual measurement data of the collection condition at the time of turning on the drive energy of a drive motor. FIGS. 20A to 20C are diagrams for explaining a signal collection state when the drive energy of the drive motor is cut off. It is a figure explaining the state where the valve stem (stem) bent. It is a figure explaining the influence which it has on the drive energy (motor current) etc. at the time of a valve stem (stem) bending, and is a figure explaining the case where a valve is operated in the opening direction. It is a figure explaining the influence which it has on the drive energy (motor current) etc. at the time of a valve stem (stem) bending, and is a figure explaining the case where a valve is operated in the closing direction. It is a graph which displays the information measured by the motor operated valve diagnostic apparatus of FIG.

Explanation of symbols

100: Electric valve diagnosis device 200: Piping 1: Drive motor 2: Gear 3: Worm 3a: Worm shaft 4: Worm gear 5: Drive stream 6: Stem nut 7: Stem (valve rod)
7 ': Yoke 8: Valve body 10: Torque spring cartridge (TSC)
11: disc spring 12: torque switch 13: power cable (power line)
15: Conduit 16: Magnetic sensor 17: Hook fastener tape (fixing means)
18: Terminal 19: Amplifier

Claims (13)

In the motorized valve diagnosis method for diagnosing the degree of abnormality of the motorized valve that mechanically transmits the rotational driving force of the drive motor to drive the valve body to open and close,
Diagnose the drive energy on / off timing of the drive motor based on signal information output from a plurality of magnetic sensors externally attached to the outside of the conduit containing the power line or control line for driving the drive motor. A motor-operated valve diagnostic method comprising:   The motor-driven valve diagnosis method according to claim 1, wherein the magnetic sensor is detachably fixed to an outer periphery of the conduit.   The signal information output from the plurality of magnetic sensors is subjected to addition, subtraction, or arithmetic processing for adding the absolute value of the signal information, and the signal information subjected to the arithmetic processing is output from each of the plurality of magnetic sensors. The motorized valve diagnosis method according to claim 1, wherein the motorized valve diagnosis method is output together with signal information.   2. The motor-driven valve diagnosis method according to claim 1, wherein the signal information output from the plurality of magnetic sensors is subjected to arithmetic processing for adding absolute values and output. In the motor-operated valve diagnostic device that diagnoses the degree of abnormality of the motor-operated valve that mechanically transmits the rotational driving force of the drive motor and drives the valve body to open and close,
A plurality of magnetic sensors externally attached to the outside of a conduit that houses a power line or a control line for driving the drive motor, and output means for outputting signal information output from the magnetic sensor. Motorized valve diagnostic device. Arithmetic means for adding, subtracting or adding the absolute value of the signal information to the signal information output from the plurality of magnetic sensors;
6. The motor-operated valve diagnosis apparatus according to claim 5, further comprising: an output unit that outputs the signal information calculated by the calculation unit together with the signal information output from the plurality of magnetic sensors.   6. The motor-operated valve diagnosis apparatus according to claim 5, further comprising a calculation unit that adds absolute values of signal information output from the plurality of magnetic sensors. In the motor-operated valve diagnosis device that diagnoses the degree of abnormality of the motor-operated valve that mechanically transmits the rotational driving force of the drive motor and drives the valve body to open and close,
Diagnosing the degree of abnormality of the motor-operated valve based on a plurality of magnetic sensors externally attached to the outside of the conduit containing the power line or control line for driving the drive motor, and signal information output from the magnetic sensor A motor-operated valve diagnostic apparatus comprising: a diagnostic means for performing the operation; and an output means for outputting a diagnosis result obtained by the diagnostic means.   Computation means for adding, subtracting, or adding the absolute value of the signal information is added to the signal information output from the plurality of magnetic sensors, and the processed signal information is a signal output from the plurality of magnetic sensors. A diagnostic means for diagnosing the degree of abnormality of the motor-operated valve based on the output signal information, and an output means for outputting a diagnostic result obtained by the diagnostic means. The motor-operated valve diagnostic apparatus according to claim 8. Computation means for adding the absolute value of signal information output from the plurality of magnetic sensors,
A diagnostic means for diagnosing the degree of abnormality of the motor-operated valve based on signal information calculated by the calculating means, and an output means for outputting a diagnosis result obtained by the diagnostic means. Item 9. A motor-operated valve diagnostic device according to Item 8.   The motor-driven valve diagnostic apparatus according to claim 5, wherein the plurality of magnetic sensors are fixed at in-plane positions orthogonal to the tube axis of the conduit tube.   The diagnostic device according to any one of claims 5 to 11, wherein the magnetic sensor is a Hall element sensor in which lines of magnetic force generated from a power cable passing through the conduit are measurable.   The motor-operated valve diagnosis apparatus according to claim 5, wherein the magnetic sensor is detachably fixed to an outer periphery of the conduit.

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