JP2011253860A - Operation monitoring system of electromagnet and operation monitoring device of electromagnet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure the operational state of an electromagnet device without using a stroke sensor.SOLUTION: The operation monitoring system of an electromagnet comprises an ammeter 6 and a voltmeter 7 which measure the current value and voltage value of a closing coil 21, an ammeter 8 and a voltmeter 9 which measure the current value and voltage value of a release coil 22. When the closing coil 21 is excited for closing operation, exciting current characteristics of the closing coil 21 and induction voltage characteristics of the release coil 22 are acquired using measurement values of the ammeter 6 and the voltmeter 9. Operational state of an electromagnet device is measured by detecting at least three feature points from these characteristics.

Description

  The present invention relates to an apparatus, a method, and the like for monitoring an operating state of an electromagnet device used for a circuit breaker / switch.

  For example, an electromagnet device used for a circuit breaker / switch or the like is a device for opening and closing a main circuit of a power facility, and basically, by moving a movable body (movable iron core or the like) by exciting a coil or the like. An opening / closing operation (closing operation / release operation) is performed. In such an electromagnet device, a closing operation is performed by exciting a coil and a releasing operation is performed by a spring or the like by stopping excitation of the coil, or a closing operation by exciting one of the two coils. A type that performs a release operation is known. Moreover, the electromagnet is used not only for a circuit breaker / switch but also for a relay contact, for example.

  As a method for measuring the operating state of the electromagnet device, for example, a method described in Patent Document 1 is known. For example, as shown in FIG. 11, a current waveform of a coil that is excited in the closing operation is combined with a signal waveform from a stroke sensor that measures the displacement of a movable part (not shown) in the closing operation.

  FIG. 11 shows an excitation current characteristic 610 (current waveform of the coil that performs excitation) and a stroke sensor characteristic 620 (signal waveform from the stroke sensor). The horizontal axis in FIG. 11 is time.

The exciting current characteristic 610 shown in FIG. 11 indicates the following, for example.
That is, at a timing 611 at which a closing command contact (not shown) is closed in response to the closing command, an exciting current flows into a coil (not shown). The exciting current increases almost linearly, but when it reaches a certain magnitude, the movable part (not shown) starts to move, so that it decreases due to the influence of the load fluctuation and reaches the inflection point 612, and then again. It increases and shifts to a substantially constant value, and then descends rapidly and disappears.

  Regarding the excitation current characteristic 610, a closing timing 611 shown in the figure is a timing at which the closing is performed in response to the input command, and is an excitation current supply start timing. Regarding the stroke sensor characteristic 620, the illustrated change start timing 621 is a timing at which the movable portion starts to move, and a change end timing 622 is a timing at which the movable portion stops moving.

  The period from the closing timing 611 to the change start timing 621 is defined as a first operation time T1 (the time from the input start command until the movable part starts to move), and the period from the change start timing 621 to the change end timing 622 is defined as a second operation time T2. To do.

  The monitoring of the operation state of the electromagnet device measures, for example, these operation times T1 and T2. For example, if a detection waveform as shown in FIG. 11 is used, these operation times T1 and T2 can be detected. .

JP 2008-293682 A

  As described above, for example, in the prior art described in Patent Document 1, the operating state is measured using two elements, the current waveform of the coil to be excited and the signal waveform from the stroke sensor. For this reason, especially with respect to the signal waveform from the stroke sensor, it is necessary to provide a space for installing the stroke sensor in the device to be measured, leading to an increase in the size of the device and an increase in cost.

  An object of the present invention is to provide an electromagnet operation monitoring system, an electromagnet operation monitoring device, and the like that can measure the operating state of an electromagnet device without using a stroke sensor, and can realize cost reduction and downsizing. That is.

  The electromagnet operation monitoring system of the present invention has a movable body, a closing coil, and a release coil, and performs the closing operation to excite the closing coil and de-energize the releasing coil. By moving the movable body in a direction different from the predetermined direction by performing a release operation in which the release coil is de-energized and the release coil is excited by moving the movable body in a predetermined direction. And a monitoring device for measuring the operating state of the electromagnet device, the ammeter and the voltmeter for measuring the current value and the voltage value of the charging coil and the releasing coil, respectively. The monitoring device includes an input means for inputting a current value measured by the ammeter and a voltage value measured by the voltmeter, and when either the closing operation or the releasing operation is executed. Further, based on the time-series data of the current value of the excitation side coil and the time-series data of the voltage value of the non-excitation side coil, each feature point indicating each timing indicating the operation state of the electromagnet device is detected. And a feature point detection unit, and an operation state measurement unit that measures an operation state of the electromagnet device based on each feature point detected by the feature point detection unit.

In the electromagnet operation monitoring system, for example, the voltage value of the non-excitation side coil is an induced voltage generated in the non-excitation side coil by excitation of the excitation side coil.
Only the time series data of the current value of the exciting coil cannot detect all the characteristic points indicating the respective timings indicating the operation state of the electromagnet device. Therefore, conventionally, for example, a stroke sensor is further used to detect each of these timings, thereby measuring the operating state of the electromagnet device.

  On the other hand, in the electromagnet operation monitoring system of the present invention, the measurement data (time series data) of the induced voltage generated in the non-excitation side coil by the excitation of the excitation side coil can be used without the need for a stroke sensor. All timings indicating the operation state of the electromagnet device can be detected, whereby the operation state of the electromagnet device can be measured.

  In the electromagnet operation monitoring system, for example, in the case of the closing operation, the feature point detection means does not use time series data of the current value of the closing coil that becomes the excitation side coil in this case. In this case, each feature point is detected based only on the time-series data of the voltage value of the release coil serving as the non-excitation coil.

  In the case of the closing operation, it is possible to measure the operating state of the electromagnet device only from the measurement data of the induced voltage (time series data) without using the time series data of the current value of the exciting side coil.

  According to the electromagnet operation monitoring system, the electromagnet operation monitoring device, and the like according to the present invention, by detecting the induced voltage generated in the coil that is not excited during the closing operation / release operation, and detecting the characteristic point of the waveform. The operating state of the electromagnet device can be measured without using a stroke sensor. As a result, it is possible to obtain an effect that the device can be downsized and the cost can be reduced as compared with the case where the stroke sensor is used.

It is a structural example of the operation state monitoring system of the electromagnet of this example, (a) is a schematic sectional drawing, (b) shows an equivalent magnetic circuit etc. FIG. FIG. 6 is a diagram (No. 1) illustrating excitation current characteristics and induced voltage characteristics during a closing operation. FIG. 6 is a diagram (part 2) illustrating an exciting current characteristic and an induced voltage characteristic during a closing operation. It is a figure which shows the exciting current characteristic in the case of release operation, and an induced voltage characteristic. It is a figure which shows the structural example of an operation state monitoring apparatus. It is an external appearance perspective view of an electromagnet device. It is A-A 'sectional drawing of an electromagnet apparatus. It is B-B 'sectional drawing (the 1) of an electromagnet apparatus. It is B-B 'sectional drawing (the 2) of an electromagnet apparatus. It is a figure which shows the equivalent magnetic circuit of the electromagnet apparatus of FIG. It is a figure which shows the conventional exciting current characteristic and stroke sensor characteristic.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a configuration example of an operation state monitoring system for an electromagnet of this example.
The electromagnet operation state monitoring system includes an electromagnet device 1 and an operation state monitoring device 2.

  FIG. 1A is a cross-sectional view schematically showing the structure of the electromagnet device 1, and FIG. 1B shows an equivalent magnetic circuit of the electromagnet device 1 shown in FIG. The structure for this (operation state monitoring device 2, ammeter, voltmeter) is shown.

  First, the electromagnet device 1 will be described. The electromagnet device 1 in this system is the above-described “type that performs a closing operation / release operation by exciting one of two coils”.

First, the electromagnet device 1 that is an operation monitoring target will be briefly described.
As shown in FIG. 1A, the main components of the electromagnet device 1 are a yoke 3, a movable body 4, a closing excitation coil 21 (hereinafter referred to as a closing coil 21), and a releasing excitation coil 22. (Hereinafter referred to as the release coil 22), and the permanent magnet 5 or the like. The detailed configuration and operation of the electromagnet device 1 will be described later in detail with reference to FIGS. 6 to 9, and here, with reference to the schematic configuration diagram shown in FIG. A brief description will be given.

The yoke 3 is a casing (frame body) of the electromagnet device 1.
The movable body 4 (movable iron core or the like) includes a movable body main body 4a made of a ferromagnetic material and a slide shaft 4b made of a nonmagnetic material. The movable body 4 is movable in a direction along the axis of the slide shaft 4b (up and down direction indicated by a thick arrow in the figure). In the drawings, the vertical direction indicated by the bold arrow is often the vertical direction as the direction of gravity in the actual electromagnet device 1. In addition, in FIG. 1A, the movable body 4 is positioned on the lower side, and this is referred to as a released state (a state that is not an input state).

  In the released state shown in FIG. 1A, when the making coil 21 is excited, the movable body 4 slides upward in the drawing, and finally the position shown in FIG. State). And even if excitation of the coil 21 for making is stopped in this state, the movable body 4 will remain in the position of the making state shown in FIG. Therefore, in order to return to the original position (released state), it is necessary to excite the release coil 22. By exciting the release coil 22, the movable body 4 slides downward in the figure, and finally reaches the position (release state) shown in FIG.

  1 (a) and 1 (b) show the flow of magnetic flux by the operation for making the application state (application operation; exciting the application coil 21), and the operation for making the release state (release operation; for release). The flow of magnetic flux by excitation of the coil 22 is shown, which will be described later with reference to FIGS.

FIG. 1B shows an equivalent magnetic circuit of the electromagnet device 1 shown in FIG.
FIG. 1B shows the magnetic circuit components (magnetomotive force) related to the making coil 21, the releasing coil 22, and the permanent magnet 5, and various components (the movable body 4 a and the yoke 3) of the electromagnet device 1. The details of these are shown in FIG. 10 and will be described later. Here, a configuration for obtaining input data of the operation state monitoring device 2 will be described.

  That is, the electromagnet device 1 includes an ammeter 6, a voltmeter 7, an ammeter 8, and a voltmeter 9 as shown in FIG. These are existing configurations for measuring the state of the electromagnet device 1.

  The ammeter 6 and the voltmeter 7 are configured to measure the current value flowing through the making coil 21 and the voltage value generated in the making coil 21. The ammeter 8 and the voltmeter 9 are configured to measure the current value flowing through the release coil 22 and the voltage value generated in the release coil 22.

  The operation state monitoring device 2 is connected to the ammeter 6, the voltmeter 7, the ammeter 8, and the voltmeter 9 and inputs these measured values and stores them as time-series current characteristic / voltage characteristic data. . It should be noted that such measurement value input and current / voltage characteristic generation / storage may be executed only when the above-described input / release operation is performed.

  On the other hand, the electromagnet device 1 is conventionally provided with a stroke sensor, and the conventional operation state monitoring device inputs not only the current / voltage measurement value but also the detection data of the stroke sensor to measure the operation described above. Had gone. That is, conventionally, an operation state is measured using two elements, a current waveform of a coil to be excited and a signal waveform from a stroke sensor. For this reason, especially with respect to the signal waveform from the stroke sensor, it is necessary to provide a space for installing the stroke sensor in the device to be measured, leading to an increase in the size of the device and an increase in cost.

  On the other hand, in this method, as shown in FIG. 1, it is not necessary to provide a stroke sensor, the cost can be reduced by the amount of the stroke sensor, and the space for installing the stroke sensor is not required, so that the size of the device is reduced. Can be achieved.

  Here, as described above, the ammeter 6, the voltmeter 7, the ammeter 8, and the voltmeter 9 have existing configurations, but conventionally, for example, only the coil to be excited is measured. That is, the current and voltage of the coil to be excited were measured. On the other hand, in this method, the current of the coil to be excited and the voltage of the coil that is not excited are measured.

  That is, in this method, the electromagnet device is based on the current waveform of the coil that is excited and the voltage waveform of the coil that is not excited (the induced voltage generated in the coil that is not excited during the closing operation / release operation). 1. Measure the operation.

  That is, first, the measurement results of the ammeter 6 and the voltmeter 9 are used in the making operation. During the closing operation, the closing coil 21 is excited and the release coil 22 is not excited. However, when the closing coil 21 is excited, an induced voltage is generated in the releasing coil 22. By using the measurement results of the ammeter 6 and the voltmeter 9, the current waveform (excitation current waveform) of the closing coil 21 that performs excitation and the voltage waveform (induced voltage waveform) of the release coil 22 that is not excited are used. It will be.

  On the other hand, in the release operation, the measurement results of the ammeter 8 and the voltmeter 7 are used. During the release operation, the release coil 22 is excited and the closing coil 21 is not excited. However, excitation of the releasing coil 22 generates an induced voltage in the closing coil 21. By using the measurement results of the ammeter 8 and the voltmeter 7, the current waveform (excitation current waveform) of the release coil 22 that performs excitation and the voltage waveform (inductive voltage waveform) of the closing coil 21 that is not excited are used. It will be.

Hereinafter, with reference to drawings (FIGS. 2 to 4) showing specific examples of these current waveforms and voltage waveforms, a method for measuring the operation of the electromagnet apparatus 1 based on these exciting current waveforms and induced voltage waveforms will be described.
The operation state monitoring device 2 in the operation state monitoring system of the electromagnet of this example is used for a circuit breaker / switch / relay, etc. based on the excitation current waveform (characteristic) and the induced voltage waveform (characteristic) measured by the above configuration. The operation state of the electromagnet device 1 to be measured is measured.

  The operation state of the electromagnet device 1 is, for example, as described above, the first operation time T1 (time from the start command to the start of the movable body 4) and the second operation time T2 (the movable body). 4 from the start to the end of the movement (movement).

FIG. 2 is a diagram (No. 1) showing exciting current characteristics and induced voltage characteristics during the closing operation.
FIG. 3 is a diagram (No. 2) showing exciting current characteristics and induced voltage characteristics during the closing operation.
FIG. 4 is a diagram showing excitation current characteristics and induced voltage characteristics during the release operation.

2, 3, and 4 are data actually measured by experiments.
The difference between FIG. 2 and FIG. 3 is the difference in the coil excitation method during the closing operation. In FIG. 2, excitation is performed until the operation is completed, and in FIG. 3, excitation of the coil is stopped halfway. However, in any case, the movable body 4 is moved to a predetermined position (position shown in FIG. 9), which will be described in detail later.

  Further, in both FIG. 2 and FIG. 3, the closing coil 21 is excited and the release coil 22 is not excited. On the contrary, in FIG. 4, the release coil 22 is excited, and the closing coil 21 is not excited.

The configuration for exciting the input coil 21 or the release coil 22 in accordance with the input operation command is an existing configuration, and is not particularly shown or described.
Here, FIG. 2 shows the displacement 11 of the moving part of the electromagnet, the excitation current characteristic 12 of the closing coil 21 when excited until the operation is completed, and the induced voltage characteristic 13 generated in the non-excited release coil 22. Yes.

  The displacement 11 of the movable part of the electromagnet indicates the movement (position) of the movable body 4 (movable iron core, etc.) of the electromagnet, substantially similar to the conventional stroke sensor characteristic 620, but there is no stroke sensor in this method. Therefore, data corresponding to the displacement 11 is not measured. The displacement 11 is shown for ease of explanation, and does not mean measurement data.

The illustrated timing t1 is a supply start timing of the excitation current according to the operation command, and is a timing corresponding to the closing timing 611 described above.
When an operation command is input at an arbitrary timing t1 and the closing coil 21 is excited, a current flows through the excited coil 21. Therefore, as shown in the excitation current characteristic 12 shown in FIG. A change appears from the rising edge 12a, and the current value increases. At the same time, a magnetic flux is generated by the excitation of the closing coil 21, so that an induction voltage is generated in the release coil 22 on the non-excitation side. This is because, as shown in the induced voltage characteristic 13 shown in FIG. 2, the non-excited coil induced voltage changing point 13a changes (voltage drop) at the same timing as the exciting current rise 12a, but for a while after that, the induced voltage changes. The voltage hardly changes.

  Thereafter, the exciting coil current increases according to the time constant of the coil as indicated by the exciting current characteristic 12, and the movable body 4 starts to move at a certain timing t2 as indicated by the displacement 11. As a result, the magnetic circuit of the electromagnet changes, so that the magnetic flux also changes, and a change appears in the induced voltage from the unexcited coil induced voltage rising 13b shown in the figure. In other words, the induced voltage is almost unchanged as described above, but starts to change at the timing t2 when the movable body 4 starts to move and starts to rise as shown in the figure.

  Due to the change in the magnetic circuit accompanying the displacement (movement) of the movable body 4, the excitation current starts to decrease as shown by the excitation current characteristic 12 and gradually decreases as shown in FIG. By stopping the excitation at t3, the exciting coil current turning point 12b shown in the figure appears and the exciting current disappears. Due to the sudden change of the magnetic flux accompanying the completion of the operation (stop of the movable body 4), the induction voltage of the release coil 22 on the non-excitation side has a peak at the non-excitation coil induction voltage peak point 13c as shown in the figure. A steep change appears.

Change points such as 12a, 12b, 13a, 13b, and 13c can be detected as feature points.
Due to such a feature point, as shown in the excitation current characteristic 12, in the current waveform of the energizing coil 21, the operation command timing t1 and the operation completion timing t3 can be detected, but the movable body 4 Since no feature appears at the start timing t2, the timing t2 cannot be detected. For this reason, a stroke sensor has been necessary in the prior art, but in this example, a stroke sensor is not necessary.

  In other words, as shown in the induced voltage characteristic 13, the induced voltage waveform generated in the non-excited release coil 22 is the timing t1 of the closing operation command, the timing t2 of the movement start of the movable body 4, and the timing t3 of the completion of the operation. Since the characteristic points 13a, 13b, and 13c are present in the waveform, it is possible to measure the operating state without using a stroke sensor by detecting the induced voltage generated in the release coil 22 that is a non-excited coil. It becomes.

  In addition, since there are various existing general methods for detecting such feature points (change points), for example, the excitation current characteristic 12 and the induced voltage characteristic 13 are predetermined. The sampling value of the ammeter and the voltmeter is sampled at the sampling period of, and when the rate of change between an arbitrary sampling value and the previous sampling value is calculated and this rate of change suddenly increases ( For example, it can be determined by comparing with a predetermined threshold value). For example, in the case of the induced voltage characteristic 13, since three feature points should be detected, the timings t1, t2, and t3 are determined in the order of time series detection.

  As described above, the operating state can be measured using only the induced voltage characteristic 13, but the present invention is not limited to this example. Except for the timing t2 when the movable body 4 starts moving, the excitation current waveform and the induced voltage waveform are not limited. Either of these may be used.

  In this way, the three changes of the excitation current rise 12a or the non-excitation coil induction voltage change point 13a, the non-excitation coil induction voltage rise 13b, the excitation coil current changing point 12b or the non-excitation coil induction voltage peak point 13c described above. By detecting points (feature points), the timings t1, t2, and t3 can be detected, and thus the first operation time T1 and the second operation time T2 shown in the figure can be measured.

  Next, an electromagnet of a type in which excitation of the making coil 21 is stopped in the middle of the operation (in the middle of movement of the movable body 4) and the making is performed by an inertia operation will be described. The present technique can be applied without any problem even in such an electromagnet device, and the operation state can be measured without using a stroke sensor.

  FIG. 3 shows the excitation current characteristic 14 of the closing coil 21 in the case of not exciting until the displacement 11-1 of the movable body 4 of the electromagnet and the operation completion (movement completion of the movable body 4) according to the electromagnet apparatus 1 of such a system. The induced voltage characteristic 15 generated in the non-excited release coil 22 is shown.

In addition, the displacement 11-1 is not measurement data like the displacement 11, but indicates the movement of the movable body 4 for easy understanding.
In the case of an electromagnetic device of a type in which the excitation of the making coil 21 is stopped during the operation of the movable body 4 and the making is performed by an inertia operation, there is no exciting current by stopping the excitation of the making coil 21 in the middle as shown in the figure. Even in this case, the movable body 4 continues to move and stops at a predetermined position due to the inertia and the force of the permanent magnet 5.

  In this case, as shown in the figure, the exciting current rise 14a, the non-excited coil induced voltage change point 15a, and the non-excited coil induced voltage rise 15b are at substantially the same timing (t1 or t2) as in FIG. Although a change occurs (respectively, the change is substantially the same as each of the feature points 12a, 13a, and 13b), a timing t4 at which a change (a feature point 14b) corresponding to the exciting coil current inflection point 12b appears is the movable body 4 This does not indicate the operation completion timing t3.

  In other words, since the excitation of the closing coil 21 is stopped before the timing t3 when the operation of the movable body 4 is completed, the excitation current is no longer present at the timing t4 before that (as shown in the characteristic point 14b in the drawing). Therefore, at the timing t3 when the operation is completed, no change point (feature point) appears in the excitation current waveform.

  However, since the movable body 4 continues to move by the inertia operation even after the excitation of the making coil 21 is stopped, the magnetic flux changes, so that the induced voltage generated in the release coil 22 on the non-excitation side is shown in the figure. As shown in the induced voltage characteristic 15, the induced voltage of the release coil 22 on the non-excitation side is caused by a sudden change in magnetic flux when the movement of the movable body 4 is completed (stopped at a predetermined position). As shown in the figure, a steep change having a peak at the non-excited coil induced voltage peak point 15c appears at timing t4.

Therefore, by detecting this (of course, by detecting the other two timings), the first operation time T1 and the second operation time T2 shown in the figure can be measured.
As described above, also in this example, as shown in the induced voltage characteristic 15, the induced voltage waveform generated in the non-excited release coil 22 is the timing t1 of the operation command, the timing t2 of the movement start of the movable body 4, Since the characteristic points 15a, 15b, and 15c appear in the waveform at all timings t3 when the operation of the movable body 4 is completed, the stroke sensor is detected by detecting the induced voltage generated in the release coil 22 that is a non-excitation side coil. Even if it is not used, the operating state can be measured.

  Also in this example, it is possible to perform the operation state measurement using not only the induced voltage characteristic 15 but also the excitation current characteristic 14, but in this example, the excitation current characteristic 14 ( The feature point 14a) can be used. The induced voltage characteristic 15 (its characteristic points 15b and 15c) is always used for the timing t2 when the movable body 4 starts moving and the timing t3 when the operation is completed.

  As described above, in this system, the closing operation of the electromagnet device 1 can be measured without using a stroke sensor. This is not limited to the closing operation, but can be realized in a similar manner for the releasing operation. This will be described below with reference to FIG.

As already described, in the case of the release operation, the measurement results of the ammeter 8 and the voltmeter 7 are used.
During the release operation, the release coil 22 is excited and the closing coil 21 is not excited. However, excitation of the releasing coil 22 generates an induced voltage in the closing coil 21. By using the measurement results of the ammeter 8 and the voltmeter 7, the current waveform (excitation current waveform; for example, the excitation current characteristic 17 shown in FIG. 4) of the release coil 22 that performs excitation and the input coil 21 that is not excited are used. Voltage waveform (induced voltage waveform; for example, induced voltage characteristic 18 shown in FIG. 4) is used.

  FIG. 4 shows the excitation current characteristic 17 and the induced voltage characteristic 18. 4 also shows the displacement 16 of the movable body 4 of the electromagnet, but this is not the measurement data but the movable body 4 for easy understanding, like the displacements 11 and 11-1 in FIGS. It shows the movement of.

  As shown in FIG. 4, the excitation current characteristic 17 is substantially the same as the excitation current characteristic 12 of FIG. 2, and the illustrated feature points 17a and 17b are substantially the same as the feature points 12a and 12b. Accordingly, the timing t1 of the release operation command and the timing t3 of the completion of the operation of the movable body 4 can be detected by the excitation current characteristic 17.

  On the other hand, with respect to the induced voltage characteristic 18, as shown in the figure, change points (feature points 18a and 18b) appear at timings t2 and t3, but no change point (feature point) appears at timing t1.

  Therefore, in the case of the release operation, unlike the case of the closing operation, the operation of the electromagnet device 1 (the first operation time T1 and the second operation time T2) cannot be measured only with the induced voltage characteristic 18. In order to measure the operation of the electromagnet device 1, both the exciting current characteristic 17 and the induced voltage characteristic 18 are necessary. This uses the feature point 17a of the exciting current characteristic 17 for the timing t1, and uses the feature point 18a of the induced voltage characteristic 18 for the timing t2. For timing t3, the feature point 17b of the excitation current characteristic 17 or the feature point 18b of the induced voltage characteristic 18 is used.

The feature points 18a and 18b are substantially the same changes as the feature points 13b and 13c or the feature points 15b and 15c (although the manner of change is opposite).
As for the release operation, as in the case of the closing operation, an electromagnetic device of a type in which the release operation is performed by the inertia operation even if the excitation of the release coil 22 is stopped during the operation (movement) of the movable body 4. It is possible to cope with this case. In this regard, although the induction voltage characteristic and the excitation current characteristic are not shown in particular, the timing t3 cannot be detected with the excitation current characteristic as in the case of FIG.

  Therefore, when the release operation is performed by the inertia operation, the characteristics / feature points are not particularly shown, but the feature points of the excitation current characteristic are used for the timing t1, and the feature points of the induced voltage characteristic are used for the timings t2 and t3. Will be used.

  As described above, in any of the closing operation and the releasing operation, the operation of the electromagnet device 1 (the first operation time T1 and the second operation time T2) can be measured without a stroke sensor. Since there is no need for a stroke sensor, the effect of cost reduction and miniaturization can be obtained.

Here, FIG. 5 shows a configuration example of the operation state monitoring apparatus 2.
The operation state monitoring apparatus 2 in the illustrated example includes an input interface 101, a memory 102, an arithmetic processor 103 such as a CPU / MPU, an output unit 104, and the like.

  The input interface 101 is connected to the ammeter 6, voltmeter 7, ammeter 8, and voltmeter 9 by a signal line (not shown), and the ammeter 6, voltmeter 7, ammeter 8, and voltmeter 9. Input the measurement data.

  Each measurement data input from the input interface 101 is temporarily stored in the memory 102, for example. This is stored, for example, in time series for each measurement data in the order of data acquisition. Thus, when the closing operation / release operation is completed, it corresponds to, for example, the exciting current characteristic 12 and the induced voltage characteristic 13, or the exciting current characteristic 14 and the induced voltage characteristic 15, or the exciting current characteristic 17 and the induced voltage characteristic 18. Data (time-series data of current / voltage measurement data) is stored in the memory 102.

  A predetermined application program is stored in the memory 102 in advance, and the arithmetic processor 103 reads out and executes this application program, thereby realizing the processing of the various processing function units shown in the drawing.

That is, the arithmetic processor 103 includes a current / voltage characteristic storage unit 111, a feature point detection unit 112, an electromagnet operation measurement unit 113, and the like.
The current / voltage characteristic storage unit 111 stores at least one measurement data among the measurement data of the ammeter 6, the voltmeter 7, the ammeter 8, and the voltmeter 9 input from the input interface 101. Are stored in chronological order in order of data acquisition, thereby generating and storing exciting current characteristic data and / or induced voltage characteristic data. Such excitation current characteristic data and / or induced voltage characteristic data can also be called time-series data of current values and voltage values.

The feature point detection unit 112 detects feature points using the excitation current characteristic data and / or induced voltage characteristic data generated and stored by the current / voltage characteristic storage unit 111.
As described above, three feature points are basically required for this feature point. That is, three characteristic points are required that indicate three timings: an operation command (excitation start) timing t1, a movable body 4 movement start timing t2, and an operation completion (movable body 4 movement completion) timing t3. At least one feature point is required for each of these three timings. Therefore, at least three feature points are required, but two feature points may be extracted for one timing. For example, in the example of FIG. 2, five feature points can be detected.

  Further, as already described, regarding the closing operation, it is possible to detect the three feature points indicating the above three timings using only the induced voltage characteristic data without using the excitation current characteristic data. On the other hand, as already described, regarding the release operation, the three feature points indicating the above three timings cannot be detected unless both the exciting current characteristic data and the induced voltage characteristic data are used.

  In either case of the closing operation or the releasing operation, it is impossible to detect the three feature points indicating the above-mentioned three timings only with the excitation current characteristic data (thus, conventionally, a stroke sensor is necessary). ).

  The electromagnet operation measurement unit 113 uses the three feature points indicating the three timings detected by the feature point detection unit 112 to operate the electromagnet device 1 (first operation time T1 and second operation time T2). ).

  The first operation time T1 is the time from the timing t1 of the operation command (excitation start) to the timing t2 of the start of movement of the movable body 4. The second operation time T2 is a time from the timing t2 at which the movable body 4 starts to move to the timing t3 at which the operation is completed (movement of the movable body 4 is completed). Therefore, for example, each operation time T1, T2 can be obtained by T1 = t2-t1 and T2 = t3-t2.

  The output unit 104 is not necessarily required, but outputs the measurement results (first operation time T1, second operation time T2, etc.) by the electromagnet operation measurement unit 113 in some form. This may be any of various methods such as display, printing, voice, and output to an external information processing apparatus via a communication line. When the output method is display, for example, the output unit 104 is a display or the like.

The electromagnet device 1 that is an operation monitoring target in the system described above will be described in more detail below with reference to a specific example.
That is, FIG. 6 shows an external perspective view of the electromagnet device 1, FIG. 7 shows an AA ′ sectional view in FIG. 6, and FIGS. 8 and 9 show a BB ′ sectional view in FIG. Show. FIG. 8 shows the released state of the movable body 4, and FIG. FIG. 10 is a circuit diagram showing a magnetic circuit of the electromagnet device 1 shown in FIGS.

  Hereinafter, although the specific example of the electromagnet apparatus 1 in this system is demonstrated with reference to FIGS. 6-10, a specific example is not restricted to this example. In addition, each component (and reference numerals thereof) in the following description is shown in at least any one of FIGS. 6 to 10, but all the drawings are described one by one. There is no.

  First, as described above, the main components of the electromagnet device 1 are the yoke 3, the movable body 4 (movable iron core, etc.), the input excitation coil 21 (hereinafter referred to as the input coil 21), and the release excitation. A coil 22 (hereinafter referred to as a release coil 22), a permanent magnet 5 and the like, and these main components are also denoted by the same reference numerals in FIG. 6 to FIG. 9 as in FIG.

  The movable body 4 includes a movable body main body 4a made of a ferromagnetic material and a slide shaft 4b made of a nonmagnetic material. As shown in FIG. 8, FIG. 9, etc., the slide shaft 4b passes through the movable body 4a and is fixed. In the movable body 4, the slide shaft 4b and the movable body main body 4a are integrated, and the movable body 4 is movable in a direction along the axis of the slide shaft 4b (up and down in the drawing). In addition, the up-down direction in this description means the direction shown by the thick line arrow in Fig.1 (a), FIG.8, FIG.9. In the following description, upper, lower, upper side, lower side, upper direction, lower direction, and the like follow this definition.

  In the released state shown in FIG. 8, when the making coil 21 is excited, the movable body 4 slides and moves upward, and finally reaches the position shown in FIG. 9 (the making state). And even if excitation of the coil 21 for making-up is stopped in this making-up state, the movable body 4 will remain in the position of the making-up state shown in FIG. Therefore, in order to return to the original position (released state), it is necessary to excite the release coil 22. By exciting the release coil 22, the movable body 4 slides and moves downward, and finally returns to the position (release state) shown in FIG.

  For example, the making coil 21 is formed in a hollow cylindrical shape by winding a coil winding 21b around an outer periphery of a cylindrical bobbin 21a having flanges at both ends. Similarly, the release coil 22 is formed in a hollow cylindrical shape by winding a coil winding 22b around the outer periphery of a cylindrical bobbin 22a having flanges at both ends, for example. The excitation means to generate a magnetic flux by passing a current through the coil winding 21b or 22b. The bobbins 21a and 22a are made of a nonmagnetic material.

The throwing coil 21 and the releasing coil 22 are fixed to the yoke 3.
The yoke 3 has a role of housing / fixing various components as a casing (frame body) of the electromagnet device 1 as described above, and further, a magnetic path of magnetic flux generated by the input coil 21 and the release coil 22. It constitutes. The yoke 3 is formed so as to constitute a circumferential magnetic path (dotted line arrows / dotted line arrows indicated by reference numerals 401, 402, and 403) that passes through the inside and outside of the closing coil 21 together with the movable body 4. The yoke 3 is made of a ferromagnetic material. As shown in FIGS. 8 and 9, the yoke 3 includes an upper yoke 31, a lower yoke 32, a pair of side yokes 33, an intermediate yoke 34, an in-coil yoke 35, and the like.

  The upper yoke 31 is in the shape of a rectangular plate, and a slide shaft hole 31a penetrating the front and back is formed in the central portion thereof. A closing coil 21 is fixed to the upper yoke 31 (for example, bonded). Moreover, the yoke 35 in a coil is arrange | positioned so that it may protrude from the plate surface (lower surface) of the upper yoke 31 like illustration, and is adhere | attached on this plate surface (lower surface). The in-coil yoke 35 is formed in a substantially cylindrical shape so as to be fitted to the inner periphery of the making coil 21.

  Each of the pair of side yokes 33 is formed in a rectangular plate shape, and has one side end fixed to the upper yoke 31 and the other side end fixed to the lower yoke 32. Each side yoke 33 is disposed so as to extend to the side surface side of the making coil 21. The pair of side yokes 33 are arranged so as to face each other with the making coil 21 interposed therebetween. An intermediate yoke 34 is disposed between the pair of side yokes 33.

  The middle yoke 34 is formed in a substantially flat plate shape, and permanent magnets 5 are disposed at both ends thereof. The middle yoke 34 is fixed to the side yoke 33 via the permanent magnets 5 at both ends thereof. As shown in the figure, the middle yoke 34 is disposed below the making coil 21, and one side plate surface thereof is bonded to the making coil 21, and the other side plate surface (the middle yoke lower surface 34 a. ) Comes into contact with a part of the movable body main body 4a (the second upper surface 42a of the flange portion 42) during the above-described charging operation.

  As shown in FIG. 7, a movable body insertion hole 34 b penetrating the front and back is formed in the central portion of the middle yoke 34. A part of the movable body main body 4a is inserted into the movable body insertion hole 34b. In other words, the movable body 4a is composed of three cylindrical parts (the input part 41, the flange part 42, and the removal part 43) having different diameters, as shown in FIG. It is inserted into the movable body insertion hole 34b. Since the flange portion 42 having the largest diameter is caught by the middle yoke 34, the flange portion 42 and the removal portion 43 are not inserted into the movable body insertion hole 34b.

  As shown in FIGS. 7, 8, and 9, a gap E exists between the insertion portion 41 and the middle yoke 34. Further, as shown in FIG. 8, in the released state, a gap C exists between the insertion portion 41 (the first upper surface 41a) and the coil inner yoke 35 (the coil inner yoke lower surface 35a). Further, as shown in FIG. 9, in the closed state, there is a gap K between the second bearing 52 and the tripping portion 43 (the movable body tripping magnetic pole surface 43a which is the lower surface thereof). Further, as long as the throwing state of FIG. 9 is not reached (not only in the released state but also during movement of the movable body 4), a gap D exists between the second upper surface 42a of the movable body 4 and the middle yoke lower surface 34a. ing. Note that air exists in the spaces of the gaps C, D, E, and K. Hereinafter, these may be referred to as air gaps C, D, E, and K, respectively.

  The lower yoke 32 is formed in a rectangular plate shape, and the other end of each of the pair of side yokes 33 is connected as described above. In other words, the lower yoke 32 is disposed so as to be bridged between the other end portions of the pair of side yokes 33.

  The lower yoke 32 is formed with a through hole 32a (a hole penetrating the front and back) in the center portion, and the second bearing 52 is fitted and fixed to the through hole 32a. This also forms the illustrated yoke tripping magnetic pole surface 32b. The slide shaft 4b of the movable body 4 is fitted into the second bearing 52. The second bearing 52 is made of a nonmagnetic material.

  One end side of the slide shaft 4b is inserted into the first bearing 51 and the other end side is inserted into the second bearing 52, so that the movable body 4 can be slidably moved in the vertical direction with respect to the yoke 3 in the drawing. It is installed. The slide shaft hole 31a, the first bearing 51, the closing coil 21, the movable body insertion hole 34b of the middle yoke 34, the release coil 22, and the second bearing 52 are coaxially arranged. The movable body 4 slides in the axial direction.

  As described above, in the electromagnet device 1, the upper yoke 31, the lower yoke 32, and the pair of side yokes 33 basically form a rectangular frame (housing), and the middle yoke 34, The coil inner yoke 35, the closing coil 21, the releasing coil 22, the movable body 4 and the like are arranged.

As described above, FIG. 9 shows a state where the movable body 4 is put in the electromagnet device 1 of this example.
The input state of the movable body 4 is a state in which the movable body 4 is located on the upper side in the figure, the first upper surface 41a of the movable body 4 and the inner yoke lower surface 35a are in contact with each other, and the movable body 4 4 is in a state where the second upper surface 42a and the middle yoke lower surface 34a are in contact with each other. Further, in this state, the slide shaft 4 b is inserted into the slide shaft hole 31 a of the upper yoke 31. As described above, in the electromagnet device 1 of this example, even when the excitation of the closing coil 21 is stopped by the magnetic force of the permanent magnet 5, this closing state is maintained.

As described above, FIG. 8 shows the released state of the movable body 4 in the electromagnet device 1 of this example.
The released state of the movable body 4 is a state in which the movable body 4 is positioned on the upper and lower sides in the drawing as shown in the figure, and the movable body tripping magnetic pole surface 43a and the second bearing 52 are in contact with each other. In this state, the slide shaft 4 b is not inserted into the slide shaft hole 31 a of the upper yoke 31.

  Here, in FIG. 8, the flow (magnetic path) of the magnetic flux when the release coil 22 is excited is indicated by a dotted arrow (reference numeral 403). As shown in the drawing, the magnetic path 403 has a substantially rectangular shape and makes one round with the release coil 22 as a substantial center.

  The flow of magnetic flux (magnetic path 403) will be described in detail later with reference to FIG. 10, but when a current is passed through the release coil 22 in the closing state shown in FIG. 9, the magnetic flux generated by the release coil 22 is changed. The lower yoke 32, the second bearing 52, the air gap K between the second bearing 52 and the movable body tripping magnetic pole surface 43a, the movable body 4a, and the air gap E between the movable body 4a and the middle yoke 34. Then, it flows through the magnetic path 403 that goes around the middle yoke 34, the permanent magnet 5, and the side yoke 33.

  This magnetic flux generates an attractive force between the yoke tripping magnetic pole surface 32b and the movable body tripping magnetic pole surface 43a until the upper surface of the second bearing 52 and the movable body tripping magnetic pole surface 43a come into contact with each other and stop ( The movable body 4 moves downward (until the release state shown in FIG. 8).

  The movable body 4 is biased downward by gravity (or by a biasing member (not shown)). Therefore, even if the current is stopped from flowing through the release coil 22, the release state shown in FIG. 8 is maintained.

Hereinafter, a case where a current is supplied to the making coil 21 in the released state shown in FIG. 8 in a state where both the making coil 21 and the releasing coil 22 are not excited will be described.
In this case, the magnetic flux generated by the closing coil 21 is the upper yoke 31, the coil inner yoke 35, the air gap C between the coil inner yoke lower surface 35a and the first upper surface 41a of the movable body main body 4a, the movable body main body 4a, the movable body. It passes through an air gap E between the body main body 4 a and the middle yoke 34, the middle yoke 34, the permanent magnet 5, and the magnetic path 401 (indicated by a one-dot chain line arrow in FIG. 8) that makes a round through the side yoke 33.

  Due to this magnetic flux, an attractive force is generated between the inner yoke lower surface 35a and the first upper surface 41a of the movable body 4a, and the movable body 4 is attracted upward (that is, attracted into the closing coil 21). . As a result, the movable body 4 moves upward, and when the movable body 4 moves over a certain distance, the distance (the length of the air gap D) between the second upper surface 42a of the movable body 4a and the middle yoke lower surface 34a is movable. It becomes shorter than the distance (length of the space gap E) between the insertion part 41 of the body main body 4a and the middle yoke 34. As a result, a magnetic path 402 indicated by a dotted arrow in FIG. 9 is formed.

  That is, in this case, the magnetic flux generated by the closing coil 21 is, as shown by dotted arrows in FIG. 9, the upper yoke 31, the coil inner yoke 35, the movable body 4a, the second upper surface 42a of the movable body 4a and the middle yoke. It passes through an air gap D between the lower surface 34 a, the middle yoke 34, the permanent magnet 5, and the magnetic path 402 that makes a round through the side yoke 33.

  In this state, the position of the movable body 4 is not the position shown in FIG. 9 (the input state) and is in a moving state, and thus the air gap D exists, but in FIG. When the position (shown state) shown is reached, the air gap D has disappeared as shown.

  The magnetic path 402 is formed while the movable body 4 is moving (the air gap D is still present). As a result, the gap between the second upper surface 42a of the movable body 4a and the middle yoke lower surface 34a. Also, a suction force is generated, and the movable body 4 slides upward (in the direction of being pulled into the making coil 21) by a larger suction force, and finally enters the making state shown in FIG.

  And even if it stops supplying an electric current to the coil 21 for making in this application state, as mentioned above, the application state is maintained by the permanent magnet 5 (it does not become a release state even if there exists gravity etc.).

After that, both the closing coil 21 and the releasing coil 22 are not excited in this closing state.
And when stopping the insertion at any time, by exciting the release coil 22 as described above, the movable body 4 is now moved downward by the magnetic path 403 as described above, Finally, it stops and reaches the position shown in FIG. 8 (released state).

Here, the magnetic circuit shown in FIG. 10 will be described.
FIG. 10 shows an equivalent magnetic circuit of the electromagnet device 1 of the specific example shown in FIGS.
In the figure, reference numeral 513 indicates the magnetomotive force of the release coil 22 generated when the release coil 22 is excited. Similarly, reference numeral 511 indicates the magnetomotive force of the permanent magnet 5, and reference numeral 512 indicates the magnetomotive force of the making coil 21 that is generated when excited by the making coil 21. Reference numerals 501 to 510, 514, and 515 shown in the figure are magnetic resistances of the respective components of the electromagnet device 1.

  In FIG. 10, the magnetic flux generated by the magnetomotive force 513 by the release coil 22 is the magnetic resistance 502 of the lower yoke 32, the magnetic resistance 515 of the second bearing 52, the second bearing 52 and the movable body tripping magnetic pole surface 43a. Magnetic resistance 509 due to air gap K between them, magnetic resistance 506 due to movable body 4a, magnetic resistance 510 due to air gap E between movable body 4a and middle yoke 34, magnetic resistance 504 of middle yoke 34, permanent magnet 5 Through the inner magnetic resistance 507, the magnetomotive force 511 of the permanent magnet 5, and the magnetic resistance 503 of the side yoke 33.

  On the other hand, the magnetic flux generated from the magnetomotive force 512 of the closing coil 21 is a magnetic resistance 501 of the upper yoke 31, a magnetic resistance 505 of the inner yoke 35, and an air gap between the inner yoke lower surface 35a and the first upper surface 41a. Magnetic resistance 508 by C, magnetic resistance 506 by movable body 4a, magnetic resistance 510 by air gap E between movable body 4a and middle yoke 34, magnetic resistance 504 of middle yoke 34, internal magnetic resistance of permanent magnet 5 507, the magnetomotive force 511 of the permanent magnet 5 and the magnetic path 401 that goes around through the magnetic resistance 503 of the side yoke 33 flow.

  The magnetic resistances 508 and 509 are variable resistances (values change as the size of the air gap changes). Similarly, the magnetic resistance 514 due to the air gap D between the second upper surface 42a and the middle yoke lower surface 34a is also a variable resistance. When the magnetic resistance 514 is smaller than the magnetic resistance 510, the main magnetic flux flows as described above. The magnetic path 401 is switched to a magnetic path 402 as shown (a magnetic path that passes through the magnetic resistance 514 instead of the magnetic resistance 510).

  As described above, according to the present method, the operating state of the electromagnet device 1 used for the circuit breaker / switch / relay, etc., even without the stroke sensor required in the prior art disclosed in Patent Document 1 etc. Can be measured. Therefore, the stroke sensor is not necessary, and the space necessary for installing the stroke sensor is not necessary, so that the operation state monitoring system of the electromagnet device can be reduced in cost and size.

  In addition, since this method detects the induced voltage generated in the non-excited coil and measures the operating state, even if it is a device that performs an operation that stops the excitation of the coil halfway and turns it on with an inertia operation , The operating state can be measured. Therefore, it is possible to increase the number of models that can handle the operation state measurement as compared with the prior art of Patent Document 1.

DESCRIPTION OF SYMBOLS 1 Electromagnet apparatus 2 Operation | movement state monitoring apparatus 3 Yoke 4 Movable body 4a Movable body main body 4b Slide shaft 5 Permanent magnet 6 Ammeter 7 Voltmeter 8 Ammeter 9 Voltmeters 11 and 11-1 Displacement of movable part of electromagnet 12 Excitation current characteristic 12a Rise of excitation current (characteristic point)
12b Excitation coil current inflection point (feature point)
13 Induced voltage characteristics 13a Non-excited coil induced voltage change point (characteristic point)
13b Rise of non-excited coil induction voltage (characteristic point)
13c Non-excited coil induced voltage peak point (characteristic point)
14 Excitation current characteristics 14a Rise of excitation current (feature point)
14b Characteristic point 15 Inductive voltage characteristic 15a Non-excited coil induced voltage change point (characteristic point)
15b Unexcited coil induced voltage rise (characteristic)
15c Non-excited coil induced voltage peak point (characteristic point)
17 Excitation current characteristic 17a Feature point 17b Feature point 18 Induced voltage characteristic 18a Feature point 18b Feature point 21 Input coil 21a Bobbin 21b Coil winding 22 Release coil 22a Bobbin 22b Coil winding 31 Upper yoke 31a Slide shaft hole 32 Lower yoke 32a Through hole 32b Yoke tripping magnetic pole surface 33 Side yoke 34 Middle yoke 34a Middle yoke lower surface 34b Movable body insertion hole 35 Coil yoke 35a Coil yoke lower surface 41 Input portion 41a First upper surface 42 Flange portion 42a Second Upper surface 43 Tripping unit 43a Movable tripping magnetic pole surface 51 First bearing 52 Second bearing 101 Input interface 102 Memory 103 Arithmetic processor 104 Output unit 111 Current / voltage characteristic storage unit 112 Feature point detection unit 113 Electromagnet operation measurement unit 401, 402, 403 Magnetic path 5 DESCRIPTION OF SYMBOLS 1 Upper yoke magnetic resistance 502 Lower yoke magnetic resistance 503 Side yoke magnetic resistance 504 Middle yoke magnetic resistance 505 Coil yoke magnetic resistance 506 Magnetic resistance due to movable body 507 Permanent magnet internal magnetic resistance 508 Air gap C Magnetic resistance 509 due to air gap K 510 Magnetic resistance due to air gap E 511 Magnetic resistance due to air gap E 511 Magnetomotive force of permanent magnet 512 Magnetomotive force of release coil 513 Magnetomotive force of release coil 514 Magnetic resistance 515 due to air gap D of second bearing 52 Magnetoresistance

Claims (4)

A movable body, a closing coil, and a release coil, and performing a closing operation to excite the closing coil and de-energize the releasing coil to move the movable body in a predetermined direction to be in a closing state. The electromagnet device that releases the movable body in a direction different from the predetermined direction by performing a release operation in which the input coil is de-energized and the release coil is excited, and the electromagnet device A system having a monitoring device for measuring an operating state,
A current meter and a voltmeter for measuring a current value and a voltage value of each of the charging coil and the releasing coil,
The monitoring device
An input means for inputting a current value measured by the ammeter, a voltage value measured by the voltmeter, and
The electromagnet device based on the time-series data of the current value of the excitation side coil and the time-series data of the voltage value of the non-excitation side coil when either the closing operation or the release operation is executed. Feature point detecting means for detecting each feature point indicating each timing indicating the operation state of
Based on each feature point detected by the feature point detection means, an operation state measurement means for measuring the operation state of the electromagnet device;
An electromagnet operation monitoring system comprising:   2. The electromagnet operation monitoring system according to claim 1, wherein the voltage value of the non-excitation side coil is an induced voltage generated in the non-excitation side coil by excitation of the excitation side coil.   In the case of the closing operation, the feature point detecting means does not use time series data of the current value of the closing coil that becomes the excitation side coil in this case, and in this case, the non-excitation side coil 3. The electromagnet operation monitoring system according to claim 1, wherein each of the feature points is detected based only on time series data of the voltage value of the release coil. It has a movable body, a closing coil, and a release coil. By performing a closing operation in which the closing coil is excited and the releasing coil is de-energized, the movable body is moved in a predetermined direction to be in a closing state. The electromagnet device is set in a released state by moving the movable body in a direction opposite to the predetermined direction by performing a releasing operation in which the coil is de-energized and the releasing coil is excited, and the operating state of the electromagnet device is measured. A monitoring device in a system comprising:
Each current value for each of the charging coil and the release coil, each ammeter for measuring a voltage value, each current value measured by each voltmeter, and input means for inputting each voltage value;
The electromagnet device based on the time-series data of the current value of the excitation side coil and the time-series data of the voltage value of the non-excitation side coil when either the closing operation or the release operation is executed. Feature point detecting means for detecting each feature point indicating each timing indicating the operation state of
Based on each feature point detected by the feature point detection means, an operation state measurement means for measuring the operation state of the electromagnet device;
An electromagnet operation monitoring device comprising: