JP5718605B2 - Electromagnet drive controller - Google Patents

Description

  The present invention relates to an electromagnet drive control device suitable for drive control of an electromagnet device that actively controls the distribution of plasma generated in a space partitioned by a partition wall, and in particular, a layer short of an exciting coil of an electromagnet, a winding, etc. The present invention relates to an electromagnet drive control device provided with an excitation coil failure detection / prediction means that can predict an abnormality such as damage or excitation coil overheating and / or failure before it occurs.

  This type of electromagnet drive control device includes an electromagnet, and forms a magnetic field in a space partitioned by partition walls by energizing an excitation current to the excitation coil of the electromagnet. In order to control the strength of the magnetic field, etc., the excitation current flowing in the excitation coil is detected by the current detection unit, and the detected excitation current signal is fed back to the current control unit to control the magnetic field strength to the target strength. Yes.

  As described above, in the electromagnet drive control device that detects and feeds back the exciting current flowing through the exciting coil and controls the exciting coil flowing current to become the target current value, when a part of the conventional exciting coil is layer short-circuited or excited In the case of failure detection or failure prediction when the coil is damaged, the current feedback value is monitored, and an abnormality is detected (determined) depending on whether this value is high or low. For example, when the current feedback value is high, it is judged as short-circuited, when it is low, the temperature is high, or the wire is disconnected (the current value is low or the wire is broken because the exciting coil temperature is high and the resistance value is high).

JP-A-7-177650

  However, in the method of monitoring the current feedback value and detecting an abnormality depending on whether this value is high or low, the feedback loop control is a control in which the difference between the coil current value (actual value) and the target value becomes zero. When the excitation coil layer short circuit or the excitation coil damage is minor, the current feedback value abnormality is also eliminated, and there is a problem that the abnormality cannot be detected. For example, when the coil resistance value decreases due to a slight layer short, the current value increases and the feedback current value increases. As a result, the feedback loop reduces the coil drive voltage output from the driver to the exciting coil in order to set the exciting current to the target value, so that the difference between the actually measured value of the exciting current and the target value is eliminated. After all, there is a problem that the abnormality cannot be detected until the abnormality reaches a level that cannot be dealt with by the feedback loop. Also, when the abnormality is minor, it is almost impossible to predict the abnormality.

  Also, when applying an exciting current to the coil, it is necessary to monitor the coil temperature in order to prevent the coil wiring clothing from melting due to the heat generated by the coil itself and / or the ambient temperature. It was necessary to increase the number of input channels of the means for displaying / notifying sensor and temperature sensor measurement values.

  The present invention has been made in view of the above points, and it is possible to accurately detect even a slight abnormality of the exciting coil such as a layer short of the exciting coil, damage to the exciting coil, overheating of the coil due to insufficient cooling, and the like. It is an object of the present invention to provide an electromagnet drive control device including a failure prediction means at low cost and in a space-saving manner.

In order to solve the above-described problems, the present invention is an electromagnet drive control device that includes an electromagnet and forms a magnetic field in a space partitioned by a partition wall by energizing an excitation coil of the electromagnet. the current command section (16), a driver (11), a current detection unit (21), comprising a fault detection and prediction means (22, 23), electrostatic system management unit magnet than (3), the current command unit ( 16) outputs a target excitation current signal (S1), and the current command section (16) receives the target excitation current signal (S1) and holds it as a target excitation current waveform, and based on the target excitation current signal (S1). A current command signal (S2, S3) is generated, and an exciting current is supplied to the exciting coil (X) via the driver (11), and a current detector (21) detects the exciting current supplied to the exciting coil (X). The detected excitation current signal (S ) Is configured to feed back to the current command section (16) and the current command portion (16), the current detecting unit (21) on the basis of the detection excitation current signal (S7) with the current command signal ( S2) is generated, and a current command assumption signal (S8) is generated from the held target excitation current waveform, and the failure detection / prediction means (22, 23) assumes the current command signal (S2) and the current command assumption. The present invention is characterized in that a function is provided for determining failure of the exciting coil or failure prediction that develops to failure when the difference between the signals (S8) deviates more than a predetermined value.
Further, according to the present invention, the DC resistance value of the exciting coil is determined from the drive voltage applied to the exciting coil for energizing the exciting coil from the detected exciting current signal (S7) detected by the current detecting unit (21). Excitation coil temperature estimation means (27) having an excitation coil temperature estimation function for estimating the excitation coil temperature from the DC resistance value is provided.

The present invention also provides an electromagnet drive control device that includes an electromagnet and forms a magnetic field in a space partitioned by a partition wall by energizing an excitation coil of the electromagnet to actively control the plasma distribution. A current command unit (16), a driver (11), a current detection unit (21), and an exciting coil temperature estimation means (27), and a current command signal (S2, S2) from the current command unit (16). In step S3), an excitation current is supplied to the excitation coil (X) via the driver (11), and the current detector (21) detects the excitation current supplied to the excitation coil (X), and detects the detected excitation current signal ( S7) is fed back to the current command unit (16), and the excitation coil temperature estimation means (27) receives the current command signal (S2) and the detected excitation current signal (S7), and receives the current command. Signal (S2 Is used to calculate a drive voltage for applying an excitation current to the excitation coil (X), and a DC resistance value of the excitation coil (X) is calculated from the drive voltage and the detected excitation current signal (S7). An excitation coil temperature estimation function for estimating the temperature of the excitation coil (X) is provided.

Further, in the above electromagnet drive controller, when the exciting coil estimated temperature estimated by the excitation coil temperature estimating means (27) deviates from the predetermined range, the exciting coil failure detection, that the failure of the excitation coil A predicting means is provided.

  In the electromagnet drive control device according to the present invention, there are a plurality of electromagnets, and the excitation coil failure detection / prediction means or the excitation coil temperature estimation means are provided corresponding to the electromagnets or divided into a plurality of groups. It is characterized by that.

  Further, the present invention is characterized in that the electromagnet drive control device is provided with alarm means for displaying and / or notifying when the excitation coil failure detection / prediction means detects a failure of the excitation coil.

  The electromagnet drive control device is characterized in that temperature display means for displaying the estimated excitation coil temperature estimated by the excitation coil temperature estimation means and / or temperature notification means for notification are provided.

According to the present invention, the current command unit (16) generates the current command signal (S2) based on the detected excitation current signal (S7) detected by the current detection unit (21), and further holds the target. A current command assumption signal (S8) is generated from the excitation current waveform, and the failure detection / prediction means (22, 23) is when the difference between the current command signal (S2) and the current command assumption signal (S8) is more than a predetermined difference. Has a function to determine the failure of the excitation coil or the prediction of failure that will develop into a failure, so even if the electromagnet's excitation coil layer shorts or windings are minimally damaged, high-precision failure detection and failure I can predict.

Further, according to the present invention, the temperature estimation alarm means receives the current command signal (S2) and the detected excitation current signal (S7), and energizes the excitation coil (X) from the current command signal (S2). Excitation voltage to calculate the DC resistance value of the excitation coil (X) from the drive voltage and the detected excitation current signal (S7), and to estimate the temperature of the excitation coil (X) from the DC resistance value Since the coil temperature estimation function is provided , the DC resistance value of the exciting coil reacts with temperature with high accuracy, so that the temperature of the exciting coil can be estimated with high accuracy.

  In addition, according to the present invention, since the exciting coil failure detecting / predicting means is provided to make the exciting coil defective when the exciting coil temperature estimated by the exciting coil temperature estimating means deviates from a predetermined range, high accuracy is provided. With this function, the excitation coil can be broken or predicted.

  Further, according to the present invention, the excitation coil failure detection / prediction means or the excitation coil temperature estimation means are provided corresponding to the electromagnets or to the electromagnets divided into a plurality of groups. It is possible to know the failure of the exciting coil of the associated electromagnet and the temperature estimation with high accuracy.

  In addition, according to the present invention, when the excitation coil failure detection / prediction means detects a failure of the excitation coil, the alarm means for displaying and / or notifying the failure is provided. Can know.

  In addition, according to the present invention, since the means for displaying and / or notifying the estimated excitation coil temperature estimated by the excitation coil temperature estimation function is provided, the estimated excitation coil temperature can be known in real time.

It is a block diagram which shows the whole structure of the electromagnet apparatus using the electromagnet drive control apparatus which concerns on this invention. It is a block diagram which shows the system structural example of the electromagnet drive control apparatus which concerns on this invention. It is a block diagram which shows the system other structure of the electromagnet drive control apparatus which concerns on this invention. It is a figure which shows the abnormality determination processing flow of the exciting coil with which the electromagnet drive control apparatus which concerns on this invention is provided. It is a figure which shows the abnormality determination processing flow of the exciting coil with which the electromagnet drive control apparatus which concerns on this invention is provided. It is a figure which shows the temperature estimation processing flow of the exciting coil with which the electromagnet drive control apparatus which concerns on this invention is provided. It is a block diagram which shows the other whole structure of the electromagnet apparatus using the electromagnet drive control apparatus which concerns on this invention. It is a block diagram which shows the other whole structure of the electromagnet apparatus using the electromagnet drive control apparatus which concerns on this invention.

  Hereinafter, embodiments of the present invention will be described in detail. FIG. 1 is a diagram showing an overall configuration of an electromagnet device using an electromagnet drive control device according to the present invention. Reference numeral 2 denotes an electromagnet drive control device that drives and controls the excitation coil rod of the electromagnet. As shown in the figure, the electromagnet drive control device 2 controls the drive of the excitation coil rods of a plurality of electromagnets 1 and one unit. There is a case where the excitation coil の of one electromagnet 1 is driven and controlled. Reference numeral 3 denotes an electromagnet device overall management unit that manages the entire electromagnet device, and is connected to the user / higher-level device interface unit 4. The electromagnet device overall management unit 3 may be provided with the function of the user / higher-level device interface unit 4.

  Each electromagnet drive control device 2 receives the target excitation current command signal S1 from the electromagnet device overall management unit 3, holds it as a target excitation current waveform, and applies the excitation current to the excitation coil Χ of the electromagnet 1 according to the target excitation current waveform. A coil drive voltage S4 to be energized is generated and output to the exciting coil Χ. As a result, an exciting current corresponding to the target exciting current command signal S1 flows through the exciting coil 、, and a magnetic field (magnetic field) is formed in a space partitioned by, for example, a partition by the generated magnetic flux.

  FIG. 2A is a block diagram showing a system configuration of the electromagnet drive control device 2 according to the present invention. The electromagnet drive control device 2 includes a driver 11 including a current command unit 16 and a power amplifier (PAMP), and a current detection unit 21. The current command unit 16 includes a digital calculation unit 15 and a D / A converter 12. I have. Based on an instruction from the user / higher-level device interface 4, the electromagnet device overall management unit 3 outputs a target excitation current command signal S 1 having various waveforms such as a sine wave, a rectangular wave, and a triangular wave to the digital of each electromagnet drive control device 2. The result is output to the calculation unit 15.

  The digital calculation unit 15 includes a CPU, receives the target excitation current command signal S1 and holds it as a target excitation current waveform, and performs “waveform” and “value” currents corresponding to the target excitation current waveform by digital calculation processing. A command signal S2 (digital quantity) is generated and output to the D / A converter 12. The D / A converter 12 converts the digital current command signal S 2 into a continuous current command signal S 3 and outputs it to the driver 11. The driver 11 amplifies the current command signal S3 with the power amplifier (PAMP) to obtain the coil drive voltage S4 and outputs it to the exciting coil の of the electromagnet 1. As a result, an excitation current of “waveform” and “value” corresponding to the coil drive voltage S4 flows through the excitation coil 、, and for example, a magnetic field (magnetic field) is formed in a space partitioned by a partition (not shown).

  The exciting current flowing in the exciting coil の of the electromagnet 1 is detected by the current detector 20 of the current detector 21, and the detected current signal is amplified by the amplifier 17 and becomes the current detection signal S6 for A / D conversion. The A / D converter 18 converts the current detection signal S 7 into a digital amount of the current detection signal S 7 and outputs it to the digital calculation unit 15. The digital arithmetic unit 15 has a correction function for comparing the detection signal S7 with the target excitation current waveform and correcting the excitation current flowing through the excitation coil に な る so as to be the current value and / or phase angle of the target excitation current waveform. Yes. As a result, the current value and phase of the excitation current flowing in the excitation coil の of the electromagnet 1 become the “value” and “phase” commanded by the target excitation current command signal S1 from the electromagnet device overall management unit 3. The digital calculation unit 15 is a part of the current command unit 16 and a part of the current detection unit 21.

  Further, as shown in FIG. 3, the current detection unit 21 may be provided with a CPU 19, and the current detection signal S7 may be fed back to the digital operation unit 15 as a digital current detection signal S7 'by means of digital communication or the like.

  In this electromagnet drive control device, as shown in FIG. 2A, the current detector 20 detects the exciting current flowing in the exciting coil の of the electromagnet 1, and a current detector 21 comprising an amplifier 17 and an A / D converter 18. Is fed back to the digital arithmetic unit 15 via In the electromagnet drive control device 2 in which the feedback system is formed in this way, when a failure occurs in the electromagnet 1 due to a layer short of the excitation coil 、, damage to the excitation coil 等, etc., it is necessary to detect this failure state. Conventionally, in order to detect such a failure of the electromagnet 1, the value of the current detection signal S7 fed back to the digital calculation unit 15 is monitored. If the value of the current detection signal S7 is large, the excitation coil シ ョ ー ト is short-circuited. If it is smaller, the value of the detection signal S7 is judged as to whether the exciting coil 正 is normal or abnormal, such as high temperature or disconnection.

  When the feedback loop system is formed as described above, the difference between the value of the detection signal S7 (measured value) detected by the current detector 20 and the value of the target excitation current command signal S1 from the electromagnet device overall management unit 3 is zero. Therefore, when the abnormality is minor, there is a problem that the abnormality cannot be detected. For example, when the resistance value of the exciting coil 上昇 increases due to the temperature rise of the exciting coil 、, the exciting current decreases, and the current detection signal S7 becomes small, the digital calculation unit 15 holds the current detection signal S7 and the digital calculation unit 15 The value of the current command signal S2 output from the digital calculation unit 15 is increased so that the difference between the target current waveforms being generated becomes zero, and the coil drive voltage from the power amplifier (PAMP) that is the driver 11 is increased. Therefore, the exciting current flowing through the exciting coil 大 き く becomes larger (recovered), and the abnormality is eliminated and the abnormality cannot be detected. That is, there is a problem in that a failure cannot be detected until the abnormality of the exciting coil 達 す る reaches a level that cannot be covered by feedback control.

  The electromagnet drive control device 2 according to the present invention is provided with a failure detection / prediction means capable of predicting a failure, that is, a stage where the failure detection and abnormality of the exciting coil cage are minor and may develop into a failure. The failure detection / prediction means will be described below. FIG. 2 (b) is a diagram showing a configuration of a failure detection / prediction means for the exciting coil cage. In the figure, 22 is a failure detection unit, and 23 is an alarm means. The failure detection unit 22 receives a current command assumption signal S8 and a current command signal S2 described later from the digital calculation unit 15. The failure detection unit 22 compares the value of the current command assumption signal S8 and the value of the current command signal S2, and if they deviate by a predetermined value or more (the correction value of the correction function of the digital calculation unit 15 is determined in advance). If it exceeds the predetermined value), it is judged as a failure or a failure prediction that develops into a failure.

  The current command assumption signal S8 is input to the digital calculation unit 15 based on the target excitation current waveform, the input / output characteristics of the driver 11, the excitation coil characteristics (resistance value, reactance value, etc.), the input / output characteristics of the amplifier 17, and the A / D. This is a current command assumption signal calculated from the input / output characteristics of the converter 18. Since the current command assumption signal S8 is obtained by calculation from the characteristics of the feedback loop system, the current command assumption signal S8 is compared with the current command signal S2 determined by the actual feedback control, thereby exciting the electromagnet 1. The failure / prediction of the coil cage can be accurately identified. In addition, when the failure detection unit 22 detects a defect in the excitation coil rod, the failure detection unit 22 transmits the failure to the alarm unit 23, and the alarm unit 23 warns of the failure or prediction of the excitation coil rod. Further, instead of the alarm means 23, a display means for displaying a failure of the exciting coil cage or a failure prediction may be provided. Further, both alarm means and display means may be provided.

  In FIG. 2B, the failure detection unit 22 is provided separately from the digital calculation unit 15 of the current command unit 16, but as will be described in detail later, the function of the failure detection unit 22 is provided with a CPU. The digital operation unit 15 may be provided.

  The DC resistance value of the exciting coil の of the electromagnet 1 depends on the temperature. The higher the temperature, the higher the DC resistance value, and the lower the temperature, the lower the DC resistance value. Therefore, it is possible to estimate the temperature of the exciting coil Χ from the DC resistance value of the exciting coil 、, and to perform failure detection or failure prediction of the exciting coil Χ. FIG. 2 (c) is a diagram showing the configuration of a failure detection / prediction means that estimates the temperature of the excitation coil か ら from the DC resistance value of the excitation coil 、 and performs failure detection and failure prediction. In the figure, 25 is a DC resistance value detection unit, 27 is a temperature estimation unit, and 28 is an alarm means. A current command signal S2 and a current detection signal S7 are input to the DC resistance value detection unit 25. In the direct current resistance value detection unit 25, the direct current resistance value of the exciting coil か ら is calculated as follows from the value of the coil drive voltage calculation signal S4 ′ calculated from the current command signal S2 and the input / output characteristics of the driver 11 and the value of the current detection signal S7. To calculate.

When DC current waveform is applied:
DC resistance value = coil drive voltage value ÷ exciting current value When AC current waveform is applied:
Impedance = Coil drive voltage value ÷ Excitation current value DC resistance value = [{(impedance) ² − (angular frequency of AC waveform × coil inductance) ² }] ^1/2

  The temperature estimation unit 27 estimates the temperature of the excitation coil Χ from the DC resistance value of the excitation coil 検 知 detected by the DC resistance value detection unit 25, and the estimated excitation coil temperature deviates from a predetermined range. At the same time, it is determined that the exciting coil 故障 is a failure or a cause of failure, and is transmitted to the alarm means 28, and the alarm means 28 warns of the detection or failure prediction of the exciting coil Χ. Further, instead of the alarm means 28, a display means for displaying a failure of the exciting coil cage or a failure prediction may be provided. Further, both alarm means and display means may be provided. Further, a temperature display means for displaying the estimated excitation coil temperature estimated by the temperature estimation function of the temperature estimation unit 27 or a temperature notification means for notification may be provided. Furthermore, a temperature display / notification unit 29 having both a function of displaying the excitation coil estimated temperature and a function of notification may be provided.

  In FIG. 2C, the DC resistance value detection unit 25 and the temperature estimation unit 27 are provided separately from the digital calculation unit 15 of the current command unit 16, but as will be described in detail later, the DC resistance value detection unit. 25 and the temperature estimation unit 27 may be provided to the digital calculation unit 15 including a CPU.

  FIG. 4 is a diagram showing a processing flow in which the function of the failure detection unit 22 in FIG. 2B is provided in the digital calculation unit 15 having a CPU, and the digital calculation unit 15 determines abnormality of the exciting coil rod of the electromagnet 1. is there. Abnormality determination is started, and in step ST1, the measured current value (measured coil current value) flowing through the exciting coil Χ is read, that is, the value (A / D) of the current detection signal S7 of the A / D converter 18 of the current detector 21. Conversion value) is acquired, and the process proceeds to step ST2. In step ST2, the current deviation A (target current value) between the target current value (target excitation current value obtained from the target excitation current waveform) and the measured coil current value (value of the current detection signal S7 of the A / D converter 18). -Actual coil current value) is calculated, and the process proceeds to step ST3. In step ST3, a command signal value B (operation amount) is calculated from the current deviation A, and the process proceeds to step ST4.

  In step ST4, an assumed value (current command assumed signal value S8) C of the command signal value (operation amount) is calculated from the target current value, the exciting coil rod, and the characteristics of the driver 11, and the process proceeds to step ST5. In step ST5, the command signal value B and the assumed value C are compared, and it is determined whether or not both are deviated by a predetermined value or more. If deviated (Y), the process proceeds to step ST6. Here, the exciting coil abnormality is output to the alarm means 23 (see FIG. 2B). If there is no deviation (N), the abnormality determination is terminated.

  FIG. 5 is a diagram showing another processing flow in which the digital calculation unit 15 performs abnormality determination of the exciting coil rod of the electromagnet 1. Abnormality determination is started, and in step ST11, an actually measured current value (a value of the current detection signal S7 of the A / D converter 18) flowing through the exciting coil 取得 is acquired, and the process proceeds to step ST12. In step ST12, a current deviation A (target current value−coil current value) between the target current value and the actually measured value of the coil current value is calculated, and the process proceeds to step ST13. In step ST13, it is determined whether or not the current deviation A is greater than or equal to a predetermined value (excessive). If the current deviation A is greater than or equal to the predetermined value (Y), the process proceeds to step ST14 and the exciting coil abnormality warning means 23 (FIG. b)). The processes from steps ST11 to ST14 are conventional processes.

  In this process, when the current deviation A is less than a predetermined value (N) determined in step ST13, the process proceeds to step ST15, where a command calculation value B (operation amount) is calculated from the current deviation value A. Move on to ST16. In step ST16, an assumed value of command signal value (operation amount) (of current command assumed signal value S8) C is calculated from the target current value, the exciting coil rod, and the characteristics of the driver 11, and the process proceeds to step ST17. In step ST17, the command signal value B and the assumed value C are compared, and it is determined whether or not the two deviate by a predetermined value or more. If the two deviate (Y), the process proceeds to step ST18. Here, the excitation coil abnormality is output to the alarm means 23 (see FIG. 2B). If there is no deviation (N), the abnormality determination is terminated.

  FIG. 6 is a processing flow in which the functions of the DC resistance value detection unit 25 and the temperature estimation unit 27 in FIG. 2C are provided in the digital calculation unit 15 to estimate the coil temperature of the exciting coil cage of the electromagnet 1 by the digital calculation unit 15. FIG. The coil temperature estimation of the exciting coil 開始 is started, and the value of the coil current flowing through the exciting coil Χ is read in step ST21 (the value of the current detection signal S7 of the A / D converter 18) is acquired, and the process proceeds to step ST22. In step ST22, a coil drive voltage calculation signal S4 'is obtained from the current command signal S2 and the input / output characteristics of the driver 11, and the process proceeds to step ST23. In step ST23, the coil resistance value is calculated from the coil current value and the value of the coil drive voltage calculation signal S4 ′ of the driver 11, and in step ST24, the current coil temperature of the exciting coil rod is estimated from the coil resistance value by the following equation. Then, the coil temperature estimation process is terminated.

Tn = 1 / α {(Rn / Rd) + α × Td−1}
Here, Tn: estimated coil temperature [° C.], Td: designed coil temperature [° C.], Rn: calculated coil resistance value [Ω], Rd: designed coil resistance value [Ω], α: heat Resistivity.

  FIG. 7 is a diagram showing an overall configuration of an electromagnet device using the electromagnet drive control device according to the present invention. Here, each electromagnet drive control device 2 is provided with both failure detection means, temperature estimation means, or both failure detection means and temperature estimation means, and each electromagnet drive control device 2 drives an excitation coil の of one electromagnet. Thus, the electromagnet drive control device 2 and the exciting coil rod of the electromagnet are configured to have a one-to-one relationship. That is, in the present embodiment, a case where one failure detection means, temperature estimation means, or both of the failure detection means and temperature estimation means is provided for the exciting coil rod of one electromagnet 1 is shown. As a result, failure detection or temperature estimation or both failure detection and temperature estimation can be performed for each excitation coil cage.

  FIG. 8 is a diagram showing an overall configuration of an electromagnet device using the electromagnet drive control device according to the present invention. Here, each electromagnet drive control device 2 is provided with both failure detection means, temperature estimation means, or both failure detection means and temperature estimation means, and each electromagnet drive control device 2 includes a plurality of (two in the figure) electromagnets. In order to drive the excitation coil つ ま り, that is, each electromagnet drive control device 2 is configured to drive the excitation coil の of a plurality of electromagnets. In other words, a case is shown in which one failure detection means, temperature estimation means, or both of the failure detection means and temperature estimation means are provided for each group composed of a plurality of electromagnets. Thereby, failure detection or temperature estimation or both failure detection and temperature estimation can be performed for each group of exciting coils.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims and the specification and drawings. Is possible.

  The present invention provides a current command signal commanded to the driver by the current command unit, a current command signal expected value (a value calculated from the excitation coil characteristics and the driver input / output characteristics based on the target excitation current value), Excitation coil failure detection and / or failure prediction means is provided that makes the excitation coil defective when the value deviates by more than a predetermined value, so that it is possible to detect an abnormality in the excitation coil of the electromagnet regardless of the feedback loop system. It can be used as an electromagnet drive control device that can detect a failure or predict a failure with high accuracy even if a layer short of an exciting coil or a defect in a winding or the like is minor.

  Further, the present invention obtains a DC resistance value of the exciting coil from a voltage applied to the exciting coil by a driver and an exciting current flowing through the exciting coil, and estimates an exciting coil temperature from the DC resistance value. Since it has a function, it can be used as an electromagnet drive control device capable of detecting an excitation coil failure and predicting a failure with high accuracy from the estimated temperature without providing a temperature sensor or a sensor input system.

DESCRIPTION OF SYMBOLS 1 Electromagnet 2 Drive circuit 3 Electromagnet apparatus whole management part 4 Detection circuit 11 Driver 12 D / A converter 15 Digital operation part 16 Current command part 17 Amplifier 18 A / D converter 19 CPU
DESCRIPTION OF SYMBOLS 20 Current detector 21 Current detection part 22 Failure detection part 23 Alarm means 25 DC resistance value detection part 27 Temperature estimation part 28 Alarm means 29 Temperature display / notification means

Claims (7)

An electromagnet drive control device that includes an electromagnet and forms a magnetic field in a space partitioned by a partition wall by energizing an excitation current to an excitation coil of the electromagnet,
A current command unit (16), a driver (11), a current detection unit (21), failure detection / prediction means (22, 23),
The electromagnet overall management unit (3) outputs a target excitation current signal (S1) to the current command unit (16), and the current command unit (16) receives the target excitation current signal (S1) and generates a target excitation current waveform. And generating a current command signal (S2, S3) based on the target excitation current signal (S1), energizing the excitation coil (X) via the driver (11), The current detection unit (21) is configured to detect an excitation current energized in the excitation coil (X) and feed back the detected excitation current signal (S7) to the current command unit (16).
The current command unit (16) generates a current command signal (S2) based on the detected excitation current signal (S7) detected by the current detection unit (21), and further holds the target excitation current waveform. From the above, a current command assumption signal (S8) is generated,
The failure detection / prediction means (22, 23) is a failure prediction that develops to a failure or failure of the exciting coil when the difference between the current command signal (S2) and the current command assumption signal (S8) is more than a predetermined difference. An electromagnet drive control device comprising a function of determining In the electromagnet drive control device according to claim 1,
From the detected excitation current signal (S7) detected by the current detector (21), the DC resistance value of the excitation coil is obtained from the drive voltage applied to the excitation coil for applying the excitation current to the excitation coil. An electromagnet drive controller comprising excitation coil temperature estimation means (27) having an excitation coil temperature estimation function for estimating the temperature of the excitation coil from the DC resistance value. An electromagnet drive control device that includes an electromagnet and forms a magnetic field in a space partitioned by a partition wall by energizing an excitation coil of the electromagnet to actively control plasma distribution,
A current command section (16), a driver (11), a current detection section (21), and an exciting coil temperature estimation means (27) ;
In response to a current command signal (S2, S3) from the current command unit (16), an excitation current is passed through the excitation coil (X) via the driver (11), and the current detection unit (21) It is configured to detect an exciting current energized in the coil (X) and feed back the detected exciting current signal (S7) to the current command unit (16).
The excitation coil temperature estimating means (27) receives the current command signal (S2) and the detected excitation current signal (S7), and supplies the excitation current to the excitation coil (X) from the current command signal (S2). A drive voltage for energization is calculated, a DC resistance value of the excitation coil (X) is calculated from the drive voltage and the detected excitation current signal (S7), and the temperature of the excitation coil (X) is calculated from the DC resistance value. An electromagnet drive control device comprising an exciting coil temperature estimation function for estimating In the electromagnet drive control device according to claim 3,
An electromagnet provided with excitation coil failure detection / prediction means for determining a failure of the excitation coil when the excitation coil estimated temperature estimated by the excitation coil temperature estimation means (27) deviates from a predetermined range. Drive control device. In the electromagnet drive control device according to any one of claims 1 to 4 ,
There are a plurality of electromagnets, and the excitation coil failure detection / prediction means or the excitation coil temperature estimation means are provided corresponding to the electromagnets or to the electromagnets divided into a plurality of groups, respectively. Drive control device. In the electromagnet drive control device according to claim 1 or 4 ,
An electromagnet drive control device comprising alarm means for displaying and / or notifying when an excitation coil failure is detected by the excitation coil failure detection / prediction means. In the electromagnet drive control device according to claim 2 or 3 ,
A temperature display means for displaying the estimated excitation coil temperature estimated by the excitation coil temperature estimation means or a temperature display / notification means (29) having both a function for displaying the estimated excitation coil temperature and a function for notifying are provided. Electromagnet drive control device.

Images