JP5285577B2 - Superconducting magnet excitation power supply - Google Patents

Description

  The present invention relates to an excitation power source for a superconducting magnet that controls power from the power source.

  2. Description of the Related Art Conventionally, there has been known a superconducting device including a superconducting magnet that excites a superconducting coil by supplying an exciting current from a power source to the superconducting coil. A superconducting magnet used in such a superconducting device has a feature that the intensity of the generated magnetic field changes according to the supplied excitation current.

  For example, Patent Document 1 individually generates a desired magnetic field by individually controlling currents flowing in superconducting coils included in a plurality of magnetic separation units to predetermined values, and individually generates impurities having different magnetic strengths from waste liquids. A collection system is disclosed. Thus, in order to generate a desired magnetic field in a superconducting device, it is important to find an optimum current to be supplied to the superconducting magnet.

  Therefore, as a method for finding an optimum current of a device using a magnetic field, an apparatus for measuring the magnetic field by changing the current value of the current is known. For example, Patent Document 2 discloses a magnetic vector measuring device that measures a magnetic field by temporally changing a current value with a predetermined current pattern, and is used for measuring a magnetic field generated in a nuclear magnetic resonance device, a superconducting magnet, or the like. It is shown that it can be done.

JP-A-10-192620 JP-A-2005-189200 (paragraph 0026, etc.)

  In Patent Document 2, it is necessary to provide a current pattern prepared in advance for each measurement, and the measurement result is output after the excitation current is controlled based on the current pattern. Therefore, it is inefficient in applications such as adjusting the excitation current at a desired timing and measuring the magnetic field or the like during excitation.

  Further, it is known that there is a limitation on the rising speed with respect to the control of the excitation current for the superconducting magnet in the superconducting state. When the exciting current rise rate exceeds this restriction, the superconducting state called quench is destroyed due to the superconducting magnet reaching a critical temperature due to heat generation. For this reason, in the structure of patent document 2, it is necessary to consider the current pattern of an exciting current beforehand so that quench may not occur.

  An object of the present invention is to provide an exciting power source for a superconducting magnet that can flexibly set an exciting current supplied to the superconducting magnet and prevent the occurrence of quenching based on such problems. is there.

  In order to achieve the above object, the present invention provides an excitation power source including a power circuit for controlling an excitation current to a superconducting magnet, an excitation current setting device capable of inputting by analog operation, and the excitation at every predetermined period. Control target value storage means for storing a current control target value, current sweep rate setting means for setting a current change amount allowed per predetermined cycle, and an excitation current arrival target based on an input to the excitation current setting device A comparison process for calculating a difference between a value and the control target value, and when there is the difference, a value obtained by adding or subtracting the current change amount to the control target value according to the sign of the difference is a new control target A periodic process having a next control target value calculation process stored as a value in the control target value storage means and a current command process for giving a current command to the power circuit based on the new control target value. The and a periodic processing control means for executing for each of the predetermined cycle.

  According to the above configuration, it is possible to input a target value of the current that is finally desired to be reached by an analog operation input. In the cycle processing, a control target value for each predetermined cycle that does not exceed the set current change amount is calculated, and a current command is issued to the power circuit. As a result, an intuitive interface that allows manual analog operation at a desired timing can be provided. In addition, the current value commanded to the power circuit is controlled so as not to exceed the set current change amount per predetermined period, regardless of any fluctuations in the input by analog operation. Quenching due to a change in current can be prevented.

  Further, the excitation power source of the superconducting magnet of the present invention further includes periodic processing start means capable of inputting a start timing for starting repetition of the periodic processing, and the periodic processing control means is configured to set the predetermined value to the predetermined value in the comparison processing. A value obtained by adding input values to the exciting current setting device may be used as the target value.

  According to the above configuration, at the start timing input to the periodic process starting means, it is possible to start the periodic process in which the exciting current is a current value obtained by adding the input value to the predetermined value as the arrival target value. As a result, a value to be added to the excitation current can be easily set, and excitation can be started at a desired timing.

  In addition, the excitation power source of the superconducting magnet of the present invention includes an excitation state display unit that displays a display mode that indicates excitation completion or excitation completion, and a display mode of the excitation state display unit when there is the difference in the periodic processing. And excitation state display control means for setting the display state of the excitation state display means to excitation completion when there is no difference in the periodic processing.

  According to the above configuration, when the control target value transmitted to the power circuit as a current command is increased or decreased every predetermined cycle, the display state of the excitation state display means indicates that the excitation is being performed, and the control target value is the target target value. In such a case, the display state of the excitation state display means indicates completion of excitation. Thereby, the excitation state can be clearly displayed.

  In addition, the exciting power source of the superconducting magnet of the present invention displays a periodic processing stop means capable of inputting a stop timing for stopping the repetition of the periodic processing, and a display mode indicating that the periodic processing is starting or the periodic processing is stopped. Periodic processing state display means and a period in which the periodic processing state display means is in a cyclic processing start state based on the start timing and a periodic processing state display means is in a periodic processing suspension state based on the stop timing Processing period display means, and the periodic processing control means may be configured to stop the periodic processing based on the stop timing.

  According to the above configuration, the periodic process is controlled by the periodic process start unit and the periodic process stop unit. Further, the periodic process state display means can display whether or not the periodic process is started. Thereby, the periodic processing is executed, and it can be clearly distinguished whether or not the input to the excitation current setting device is immediately reflected in the periodic processing.

  Further, the exciting power source of the superconducting magnet of the present invention includes ratio setting means for setting a ratio for calculating a magnetic field strength value generated by the superconducting magnet from a current value indicated by a current command to the power circuit, and the ratio And a magnetic field strength display means for displaying a current reaching target value based on the input to the exciting current setting device as the magnetic field strength value.

  According to the above configuration, the ratio of the current value to the superconducting magnet and the magnetic field strength value generated by the superconducting magnet is set, and the current target value based on the input to the excitation current setting device is displayed as the magnetic field strength value. Can be done. As a result, the excitation current can be set while confirming the magnetic field intensity calculated by the set ratio.

  The superconducting magnet excitation power source of the present invention is a superconducting magnet excitation power source having a power circuit for controlling the current for exciting the superconducting magnet to a constant current value, and an excitation current increasing / decreasing device capable of inputting by analog operation. A current sweep rate setting means for setting a current change amount allowed per predetermined period; and a current increase / decrease amount calculation for calculating a current increase / decrease amount by multiplying the current change amount by a ratio based on an input from the excitation current increase / decrease unit Periodic processing control means for executing periodic processing having processing and command processing for giving a current command to the power circuit based on the current increase / decrease amount for each predetermined cycle.

  According to the said structure, the ratio with respect to the set current change amount can be input by the input by analog operation. In the cycle processing, the current change amount is multiplied by the input ratio value to calculate a current increase / decrease amount for each predetermined cycle, and a current command is issued to the power circuit. As a result, an intuitive interface that allows manual analog operation at a desired timing can be provided. In addition, the current value commanded to the power circuit is controlled so as not to exceed the set current change amount per predetermined period, regardless of any fluctuations in the input by analog operation. Quenching due to a change in current can be prevented.

  Further, the excitation power source of the superconducting magnet of the present invention is an increase / decrease amount ratio setting means for setting a ratio between the current change amount per predetermined period and the change amount of the magnetic field intensity generated by the superconducting magnet by the current change amount. And a magnetic field intensity display means for displaying the ratio based on the input to the exciting current increase / decrease unit as the change amount of the magnetic field intensity based on the ratio.

  According to the above configuration, the ratio of the adjustment current change amount to the superconducting magnet and the change amount of the magnetic field intensity generated by the superconducting magnet is set, and the current increase / decrease amount calculated based on the input to the excitation current increase / decrease device is set to the magnetic field. It can be displayed as a change amount of intensity. Thereby, it is possible to input a ratio with respect to the current change amount while confirming the change amount of the magnetic field intensity calculated by the set ratio.

  According to the exciting power source of the superconducting magnet of the present invention, an intuitive interface can be provided and quenching due to a change in the exciting current to the superconducting magnet can be prevented.

It is a perspective view which shows the excitation power supply of 1st Embodiment. It is a top view which shows the remote control of 1st Embodiment. It is a figure which shows the functional block of the exciting power supply of 1st Embodiment. It is a flowchart which shows the periodic process of 1st Embodiment. It is a figure which shows the functional block of the excitation power supply of 2nd Embodiment. It is a figure which shows the functional block of the excitation power supply of 3rd Embodiment. It is a top view which shows the remote control of 3rd Embodiment. It is a flowchart which shows the periodic process of 3rd Embodiment.

(First embodiment)
The first embodiment of the present invention will be described below. As shown in FIG. 3, the excitation power source 100 according to the present embodiment includes a power circuit 9 that controls power from the commercial power source 40 and supplies a current for exciting the superconducting magnet (hereinafter referred to as an excitation current). It is. Although not shown, a current shunt for detecting a current value is provided on the supply line from the power circuit 9 to the superconducting magnet 12. The current shunt feeds back the current value to the power circuit 9. Thereby, the power circuit 9 can control the current supplied to the superconducting magnet 12 to the commanded current value.

  As shown in FIG. 1, the excitation power source 100 includes a remote controller 30 and a main body 31.

  The remote controller 30 is connected to multiple ends of a cable 30a having a connector 30b at one end. By connecting the connector 30b to the main body 31, data communication between the remote controller 30 and the main body 31 is enabled. The connection between the remote controller 30 and the main body 31 is not limited to this form. For example, wireless connection such as infrared rays may be used.

  In addition, the remote controller 30 has an exciting current setting device 1. The exciting current setting device 1 is a rotary analog input device that is rotatably provided on the remote controller 30. That is, the exciting current setting device 1 is configured to be rotatable by an analog operation from the outside. The exciting current setting device 1 has a variable resistor (not shown) inside. The resistance value of the variable resistor is changed according to the angle at which the exciting current setting device 1 is rotated.

  In addition, the remote controller 30 has a converter 11 inside. The converter 11 detects the resistance value (analog value) of the variable resistor in the excitation current setting device 1, converts it into a digital signal indicating the current value, and transmits it to the main body 31. That is, the remote controller 30 can transmit the current value indicated by the input to the excitation current setting device 1 to the main body 31 via the cable 30a. In the present embodiment, the current value indicated by the input to the excitation current setting device 1 is referred to as a reaching target value.

  In the present embodiment, the remote controller 30 can transmit a current value from 0 A to 300 A to the main body 31. As shown in FIG. 2, the remote controller 30 is provided with a scale 30c. The scale 30c is attached along a circular locus in accordance with the shape of the exciting current setting device 1 every 5A from 0A to 300A. Further, the exciting current setting device 1 is marked with a mark 1a indicating the current set value. The exciting current setting device 1 is rotated so that the mark 1a matches the position of the desired current value on the scale 30c, whereby the desired reaching target value is transmitted from the remote controller 30 to the main body 31. In the example of FIG. 2, the excitation current setting device 1 is rotated so that the mark 1a matches 0A to 100A on the scale 30c.

  In this way, the current value to be finally reached can be input as the target value by analog input. As a result, an intuitive interface that allows manual analog operation at a desired timing can be provided.

  As shown in FIG. 1, the main body 31 has a control panel 31a having a plurality of input buttons and a display panel 31b composed of a fluorescent display tube. The control panel 31 a and the display panel 31 b are provided on the front surface of the main body 31. Although not shown, the main body 31 has an input terminal for inputting power from a commercial power source and an output terminal for outputting an excitation current to the superconducting magnet.

  The control panel 31a has a plurality of input buttons to change the excitation current to the superconducting magnet 12 from the period, the amount of current change allowed per period, and the current value indicated by the current command to the power circuit 9 to the superconducting magnet 12. It is possible to set a ratio for calculating the magnetic field strength value at which the above occurs. In the present embodiment, the “ratio” indicates a value obtained by dividing the magnetic field strength value by the current value.

  The “current change amount allowed per cycle” is the difference between the current value indicated by the current command to the power circuit 9 in the Nth cycle and the current value indicated by the current command to the power circuit 9 in the (N + 1) th cycle. Indicates the upper limit of.

  In the present embodiment, the control panel 31a can input a current change amount per second (hereinafter referred to as a current sweep rate). The amount of current change allowed per cycle is calculated by multiplying the set cycle by the current sweep rate. Thereby, the control panel 31a can realize the setting of the current change amount allowed per cycle.

  Specifically, when the set cycle is “0.1 sec” and the set current sweep rate is “0.1 A / sec”, the current change amount allowed per cycle (0.1 sec) is: Both are multiplied to become “0.01A”. Note that “current change amount” indicates “current change amount allowed per period” unless otherwise specified in the following description.

  In addition, the main body 31 includes a CPU (Central Processing Unit), an EEPROM (Electrically Erasable and Programmable Read Only Memory) that stores a program executed by the CPU and data used in these programs in a rewritable manner, and data when the program is executed. And a RAM (Random Access Memory) for temporarily storing. Each functional unit included in the main body 31 is constructed by cooperation of these hardware and software in the EEPROM.

  That is, as shown in FIG. 3, the main body 31 includes a display control unit 32, a control target value storage unit 4, and a periodic processing control unit 33.

  The display control unit 32 performs control to display the “reached target value”, “control target value”, and “predicted value of magnetic field strength” on the display panel 31b. The display control unit 32 acquires the reaching target value from the exciting current setting device 1 via the converter 11 and displays it on the display panel 31b. Moreover, the display control part 32 acquires a control target value from the control target value memory | storage part 4, and displays it on the display panel 31b. In addition, the display control unit 32 calculates the predicted value of the magnetic field strength generated by the superconducting magnet 12 by multiplying the target value by the above ratio, and displays it on the display panel 31b.

  Specifically, the display of “predicted value of magnetic field strength” will be described. When the current transmitted to the power circuit 9 is “100 A” and the measured value of the magnetic field intensity generated by the superconducting magnet 12 under a predetermined condition is 1 T (Tesla), the superconducting magnet under the predetermined condition 12 is expected to change at a magnetic field intensity ratio of 1/100 with respect to the current value. By setting the ratio of 1/100 in advance using the control panel 31a, it is possible to display the magnetic field strength as the calculation value on the display panel 31b.

  For example, when the superconducting magnet 12 under a predetermined condition wants to find an excitation current for generating a magnetic field strength of 1.5T, the excitation current setting device 1 is operated by analog operation so that 1.5T is displayed on the display panel 31b. To do. As a result, the actual superconducting magnet 12 is expected to generate a magnetic field strength value close to 1.5T. In this way, it is possible to easily find a current value for obtaining a desired magnetic field intensity under a predetermined condition.

  The control target value storage unit 4 has a function of storing the control target value of the excitation current for each period. When the excitation power supply 100 is activated, the control target value in the control target value storage unit 4 is set to 0A.

  The cycle processing control unit 33 has a function of issuing a current command to the power circuit 9 for each cycle. Specifically, the periodic process control unit 33 includes a comparison unit 6, a next control target value calculation unit 5, and a current command unit 7. Although not shown, the cycle processing control unit 33 has a timer counter that measures the cycle.

  The comparison unit 6 has a function of executing a comparison process for calculating a difference between the target current value of the excitation current and the control target value. In other words, the reaching target value is acquired for each cycle via the converter 11 and compared with the control target value stored in the control target value storage unit 4 to calculate a difference. The calculation result is transmitted to the next control target value calculation unit 5.

  When there is a difference, the next control target value calculation unit 5 adds, as a new control target value, a value obtained by adding or subtracting the current change amount to the control target value according to the sign of the difference in the control target value storage unit 4. It has a function of executing the next control target value calculation process to be stored. That is, the next control target value calculation unit 5 determines the difference calculated by the comparison unit 6 and, if there is a difference, calculates the control target value and the current change amount so as to approach the ultimate target value. ing.

  Specifically, the next-time control target value calculation unit 5 adds a current change amount to the control target value when the final target value is larger than the control target value stored in the control target value storage unit 4, and performs a new control. Calculate the target value. Further, the next control target value calculation unit 5 subtracts the current change amount from the control target value when the final target value is smaller than the control target value stored in the control target value storage unit 4, thereby generating a new control target value. Is calculated. The calculated new control target value is transmitted to the current command unit 7 and stored in the control target value storage unit 4.

  The current command unit 7 has a function of executing a current command process for giving a current command to the power circuit 9 based on the new control target value transmitted from the next control target value calculation unit 5. Specifically, the control target value calculated by the next control target value calculation unit 5 is converted into an analog signal and transmitted to the power circuit 9.

  The power circuit 9 is supplied with electric power from an external commercial power supply 40 and supplies an exciting current to the superconducting magnet 12. The power circuit 9 controls the excitation current based on the current command from the current command unit 7.

  Next, the periodic processing operation of the excitation power supply 100 will be described with reference to FIG. FIG. 4 is a flowchart showing a periodic process executed by the periodic process control unit 33 of the excitation power source 100. In the present embodiment, this periodic process is triggered by the activation of the excitation power supply 100. However, the present invention is not limited to this, and the periodic processing may be triggered by the fact that the excitation current setting device 1 is first operated after the excitation power source 100 is activated.

  First, the ultimate target value indicated by the exciting current setting device 1 is acquired (A1). And the control target value memorize | stored in the control target value memory | storage part 4 is acquired (A2). Here, what is acquired is the control target value for which a current command has been issued to the power circuit 9 in the previous cycle.

  Then, it is determined whether or not there is a difference between the acquired arrival target value and control target value (A3). That is, it is determined whether or not the control target value commanded to the power circuit 9 in the previous cycle has reached the reaching target value input by the exciting current setting device 1. If there is no difference (A3: NO), the process proceeds to A5 described later. Thus, the comparison process includes the processes A1 to A3.

  On the other hand, when there is a difference (A3: YES), a new control target value is calculated (A4). Specifically, when the target target value is 101A and the control target value that is current-commanded to the power circuit 9 in the previous cycle is 100A, there is a difference of 1A. Here, since the reaching target value is larger than the control target value, the current change amount is added to 100A. For example, when the current change amount is 0.01 A, the new control target value is 100.01 A. That is, if the target value is not changed by the exciting current setting device 1 during excitation, 0.01A is added to the control target value by 100.01A, 100.02A, 100.03A,. To 101A. In this way, the next control target value calculation process includes the process A4.

  Next, a current command is issued to the power circuit 9 (A5). Although not shown, the power circuit 9 controls the excitation current to a current value based on the current command in accordance with the current command. That is, the current command process has a process of A5.

  Then, it is determined whether the cycle set by the control panel 31a has elapsed (A6). When one cycle does not elapse (A6: NO), the process of A6 is repeated, and when one cycle elapses, the process returns to A1.

  As described above, the process of bringing the control target value closer to the target value by the amount of current change is executed every cycle until the control target value transmitted to the power circuit 9 reaches the target value. That is, in the cycle processing, a control target value for each cycle that does not exceed the set current change amount is calculated, and a current command based on the control target value is issued to the power circuit 9. As a result, the current value commanded to the power circuit 9 is controlled so as not to exceed the set current change amount per cycle regardless of any fluctuation in the input by the analog operation. Quenching due to the change in the excitation current can be prevented.

  For example, even when the operator performs an abrupt operation on the excitation current setting device 1, the excitation current is controlled according to the current sweep rate. In this way, even an operator who is not accustomed to changing the excitation current can change the excitation current without causing a quench.

(Second Embodiment)
Hereinafter, a second embodiment of the present invention will be described. In addition, about the same member and function part as 1st Embodiment, the code | symbol same as 1st Embodiment is attached | subjected and description is abbreviate | omitted.

  Compared with the previous first embodiment, the excitation power source 200 according to the present embodiment is capable of setting the initial setting value of the excitation current on the control panel 31a, the initial setting value as the current value from the excitation current setting device 1. The difference is that the value obtained by adding is the target value, and that the main body 31 has the excitation button 34.

  The control panel 31a of the present embodiment can set an initial setting value of the excitation current. The initial set value is a current value, and is an initial target value of the excitation current to the superconducting magnet 12. The initial set value is not limited to this, and may be a predetermined value.

  In the present embodiment, the input value input to the excitation current setting device 1 is a current value added to the above-described initial setting value. Therefore, in this embodiment, the sum of the current value indicated by the input to the excitation current setting device 1 and the initial set value set in the control panel 31a is the target value.

  Further, in the present embodiment, as shown in FIG. 5, the main body 31 has an excitation button 34 that can input the timing for starting the repetition of the periodic processing. The excitation button 34 is an input device that is provided on the front surface of the main body 31 and can be input by being pressed. When the excitation button 34 is pressed, control of periodic processing is started so that the excitation current to the superconducting magnet 12 is the target value. For the purpose of preventing operational mistakes, when the initial set value is not set, the periodic process does not start even if the current value to be added by the excitation current setting device 1 is input. It is good to make it. Even if the initial setting value is not set (the initial setting value is 0 A), even if the current value is input by the exciting current setting device 1, the periodic processing may be started. Good. Thereby, versatility can be improved.

  The excitation button 34 is an illuminated switch having an LED (Light Emitting Diode). Although not shown, the LED is provided so that lighting can be seen from the outside. The LED is turned on to indicate “exciting”, and the LED is turned off to indicate “excitation completed”. That is, the excitation button 34 having an LED functions as an excitation state display means for displaying an excitation state. “Exciting” indicates a state in which the excitation current is changed by the periodic process, and “excitation completed” indicates a state in which the excitation current reaches the target value to be controlled at a constant current. Hereinafter, this “excitation completion” state is also referred to as “FT (flat top) state”.

  The display mode of the excitation state display means is not limited to this. For example, characters such as “exciting” and “excitation completed” may be displayed on the display panel 31b or other display means.

  Next, differences in the setting operation of the excitation current of the excitation power source 200 will be described with reference to FIG. 4 described in the first embodiment. The periodic processing of the present embodiment is triggered by pressing of the excitation button 34 as a trigger.

  In the present embodiment, it may be determined whether or not an initial setting value is set in the control panel 31a before the process of A1. That is, it is determined whether or not the initial setting value is 0A. If the initial setting value is not set (the initial setting value is 0A), the process is terminated. In this method, when the initial setting value is set, the process of A1 is executed. Finally, A1 may be performed.

  Also, in the process of A1, unlike the first embodiment, the initial set value set on the control panel 31a and the current value input to the excitation current setting device 1 are added to obtain the target value.

  Further, when there is a difference between the reaching target value and the control target value in the process of A3, the LED of the excitation button 34 is controlled to be turned on. Thereafter, the process of A4 is executed. If there is no difference between the arrival target value and the control target value in the process of A3, the LED of the excitation button 34 is controlled to be turned off. Since other processes are the same as those in the first embodiment, a description thereof will be omitted.

  In this way, at the timing when the excitation button 34 is input, it is possible to start the periodic processing in which the excitation current is a target value obtained by adding the input value to the predetermined value. Thereby, the value to be added to the excitation current can be easily set, and excitation of the superconducting magnet 12 can be started at a desired timing.

  Further, when the control target value transmitted to the power circuit 9 as a current command is increased or decreased every predetermined cycle, the LED is controlled to “lighting” which is a display mode indicating that excitation is being performed. Further, when the control target value becomes the reaching target value, the LED is controlled to “turn off”, which is a display mode indicating completion of excitation. Even when the LED is controlled to be “off” after completion of excitation, if the value of the excitation current setting device 1 is changed, a difference between the target value and the control target value is obtained in the process A3 of the periodic process. In order to generate | occur | produce, LED is controlled to "lighting." Thereby, the excitation state can be clearly displayed.

  As a modification of the present embodiment, for example, when the excitation button 34 is pressed, it may be controlled to turn on or blink. Specifically, the periodic process is started when the excitation button 34 is pressed. When there is a difference between the target value and the control target value in the periodic process, the LED of the excitation button 34 is controlled to be turned on as “exciting”. If there is no difference, the LED of the excitation button 34 is controlled to blink as “excitation completed”. That is, when the LED of the excitation button 34 is blinking, it indicates that it is in the FT state.

  Further, when the excitation button 34 is controlled to be turned on or blinking, when the excitation button 34 is pressed, the periodic processing is stopped based on the timing, and the LED of the excitation button 34 is controlled to be turned off. . That is, the excitation button 34 functions as a periodic process start unit and also functions as a periodic process stop unit.

  Further, the LED of the excitation button 34 functions as an excitation state display means that indicates “exciting” when it is controlled to light and flashes and indicates “excitation completed”. Further, the LED of the excitation button 34 functions as a periodic processing state display means that indicates “starting periodic processing” by being turned on or blinking, and indicates “stopping periodic processing” by being turned off. “Periodical processing is starting” indicates that periodic processing is started by the periodic processing control unit 33, and “Periodic processing is stopped” indicates that periodic processing is being stopped by the periodic processing control unit 33. Show.

  In this manner, since it is displayed whether or not the periodic processing has been started, it is possible to clearly distinguish whether the exciting current setting device 1 is valid or invalid. That is, it is possible to distinguish whether or not the value input to the excitation current setting device 1 is immediately reflected in the periodic processing.

  In addition, the display mode of LED of the excitation button 34 is not limited to these. For example, the lighting control may be performed for both “exciting” and “excitation completed”. Further, the periodic processing is not limited to being stopped by pressing the excitation button 34 again. For example, the LED of the excitation button 34 may be turned off when another button is pressed, and the excitation current may be gradually gradually reduced to 0A.

(Third embodiment)
Hereinafter, a third embodiment of the present invention will be described. In addition, regarding the same member and function part as previous embodiment, the same code | symbol as previous embodiment is attached | subjected, and description is abbreviate | omitted.

  As shown in FIG. 6, the excitation power source 300 according to the present embodiment includes a remote controller 330 and a main body 331 as in the first embodiment.

  The remote controller 30 has an exciting current increase / decrease unit 20 and a converter 11. Like the excitation current setting device 1, the excitation current increase / decrease device 20 is a rotary analog input device, and has a variable resistor (not shown) inside.

  The converter 11 detects the resistance value (analog value) of the variable resistor in the exciting current setting device 1 in the same manner as the exciting current setting device 1, but converts it into a digital signal indicating the ratio to the current change amount. To the main body 331. That is, the remote controller 330 can transmit a ratio with respect to the current change amount indicated by the input to the excitation current setting device 1 to the main body 331 via the cable 30a.

  In the present embodiment, the remote controller 330 can transmit a ratio of −100% to + 100% to the main body 331. As shown in FIG. 7, the remote controller 330 has a scale 330c. The scale 330c is attached along a circular locus according to the shape of the exciting current increase / decrease unit 20 every 10% from -100% to + 100%. Further, the exciting current increase / decrease unit 20 is marked with a mark 20a indicating the current set value. The exciting current increase / decrease unit 20 is rotated so that the mark 20a matches the position of the desired ratio on the scale 330c, whereby the desired ratio is transmitted from the remote controller 330 to the main body 331. In the example of FIG. 7, the exciting current setting device 1 is rotated so that the mark 20a matches 0% to −50% of the scale 330c.

  When a ratio is input by the excitation current increase / decrease unit 20, the excitation current is changed for each period by a value obtained by multiplying the current change amount set by the control panel 31a by the ratio (hereinafter referred to as current increase / decrease amount). It is like that. That is, in the example of FIG. 7, when the current change amount is 0.01 A, the excitation current is changed by 0.01 × −50% = − 0.005 A for each period. That is, during a period in which -50% is input to the excitation current increase / decrease unit 20, the excitation current is decreased by 0.005 A per cycle. The exciting current increase / decrease unit 20 is energized so as to be 0% when not operated.

  The main body 331 of the excitation power supply 300 includes the display panel 31b and the power circuit 9 similar to those in the first embodiment.

  Furthermore, as shown in FIG. 6, the main body 331 of the excitation power supply 300 includes a control panel 331 a, a display control unit 332, and a periodic processing control unit 333.

  The control panel 331a includes a plurality of input buttons, and includes a period for changing the excitation current to the superconducting magnet 12, a current change amount allowed per period, and a magnetic field intensity generated by the superconducting magnet 12 due to the current change amount. The ratio to the change amount can be set. In the present embodiment, the “ratio” indicates a value obtained by dividing the amount of change in magnetic field strength by the amount of change in current.

  The display control unit 332 performs control to display “current increase / decrease amount” and “predicted value of increase / decrease amount of magnetic field strength” on the display panel 31b. The display control unit 332 acquires a current increase / decrease amount calculated by a current increase / decrease amount calculation unit 14 to be described later, and displays it on the display panel 31b. The display control unit 32 calculates the predicted value of the magnetic field intensity generated by the superconducting magnet 12 by multiplying the current increase / decrease amount by the above ratio, and displays it on the display panel 31b.

  Specifically, the display of “predicted value of increase / decrease amount of magnetic field strength” will be described. When the measured value of the magnetic field intensity generated by the superconducting magnet 12 under a predetermined condition is changed from 1T to 1.01T when the current transmitted to the power circuit 9 is changed from “100A” to “101A”, The superconducting magnet 12 under this predetermined condition is expected to change with a change amount of the magnetic field strength at a ratio of 1/100 to the current value. When this ratio of 1/100 is preset by the control panel 31a, the display panel 31b is multiplied by the current increase / decrease amount calculated from the ratio input to the excitation current increase / decrease unit 20 and the current change amount. “Predicted value of increase / decrease amount of magnetic field strength” can be displayed.

  For example, when the increase / decrease amount of the magnetic field strength is to be changed by + 0.01T with respect to the superconducting magnet 12 under a predetermined condition, the excitation current increase / decrease unit 20 is operated by analog operation so that + 0.01T is displayed on the display panel 31b. To do. As a result, the actual superconducting magnet 12 is expected to change with an increase / decrease amount of the magnetic field strength close to + 0.01T. In this manner, it is possible to easily find the current increase / decrease amount for obtaining the desired increase / decrease amount of the magnetic field intensity under a predetermined condition.

  The cycle processing control unit 333 has a function of issuing a current command to the power circuit 9 for each cycle. Specifically, the periodic process control unit 333 includes a current increase / decrease amount calculation unit 14 and a current command unit 7. In the present embodiment, the current command indicates an increase / decrease amount of the current.

  The current increase / decrease amount calculation unit 14 calculates the current increase / decrease amount per cycle by multiplying the current change amount by the ratio based on the input from the excitation current increase / decrease unit 20. The current command unit 7 issues a current command to the power circuit 9 so as to increase / decrease by the calculated current increase / decrease amount for each cycle.

  Next, the periodic processing operation of the excitation power supply 300 will be described with reference to FIG. FIG. 8 is a flowchart showing periodic processing executed by the periodic processing control unit 333 of the excitation power source 300. This periodic process is triggered by an operation on the exciting current increase / decrease unit 20.

  First, the ratio indicated by the exciting current increase / decrease unit 20 is acquired (B1). Here, the acquired ratio is displayed on the display panel 31b. Then, it is determined whether or not the ratio is 0% (B2). That is, it is determined whether or not the exciting current increase / decrease unit 20 has been operated so that the ratio indicates 0%. If the ratio is 0% (B2: YES), the process is terminated.

  On the other hand, when the ratio is not 0% (B2: NO), the current change amount set in the control panel 331a is acquired (B3), and the current increase / decrease amount is calculated (B4). Here, the current increase / decrease amount and the predicted value of the increase / decrease amount of the magnetic field strength calculated from the current increase / decrease amount are displayed on the display panel 31b.

  Then, the current increase / decrease amount is transmitted to the power circuit 9 as a current command (B5). Thereafter, it is determined whether the period set by the control panel 31a has elapsed (B6). If one cycle has not elapsed (B6: NO), the process of B6 is repeated, and if one cycle has elapsed, the process returns to B1.

  In this manner, an intuitive interface that allows manual analog operation at a desired timing can be provided. In addition, the current increase / decrease commanded to the power circuit 9 is controlled so as not to exceed the set current change amount per cycle regardless of any fluctuation in the input by the analog operation. Quenching due to the change in the excitation current can be prevented.

  Further, a ratio between the adjustment current change amount to the superconducting magnet 12 and the change amount of the magnetic field intensity generated by the superconducting magnet is set, and the current increase / decrease amount calculated based on the input to the excitation current increase / decrease unit 20 is set as the magnetic field strength. It can be displayed as a change amount. Thereby, it is possible to input a ratio with respect to the current change amount while confirming the change amount of the magnetic field intensity calculated by the set ratio.

(Outline of this embodiment)
As described above, the present embodiment is an excitation power supply 100/200 including the power circuit 9 that controls the excitation current to the superconducting magnet 12, and includes the excitation current setting device 1 that can be input by analog operation, Control target value storage means (control target value storage section 4) for storing the control target value of the excitation current for each period; current sweep rate setting means (control panel 31a) for setting the current change amount allowed per predetermined period; When there is a difference between the comparison process for calculating the difference between the target value of the exciting current and the control target value based on the input to the exciting current setting device 1, the current is changed with respect to the control target value according to the sign of the difference The next control target value calculation process for storing the value obtained by adding or subtracting the amount in the control target value storage means as a new control target value, and a current command based on the new control target value in the power circuit 9 Cormorant current command processing and constituted by a periodic processing control means for executing a periodic process at every predetermined period (cycle process control unit 33) having a.

  According to the above configuration, it is possible to input a target value of the current that is finally desired to be reached by an analog operation input. In the cycle processing, a control target value for each predetermined cycle that does not exceed the set current change amount is calculated, and a current command is issued to the power circuit 9. As a result, an intuitive interface that allows manual analog operation at a desired timing can be provided. Furthermore, since the current value commanded to the power circuit 9 is controlled so as not to exceed the set current change amount per predetermined cycle, no matter what fluctuation is caused by the input by the analog operation, the superconducting magnet 12 Quenching due to the change in the excitation current can be prevented.

  Moreover, the excitation power source 200 used for the superconducting magnet 12 of the present embodiment further includes periodic processing start means (excitation button 34) that can input the timing for starting repetition of periodic processing, and the periodic processing control means includes comparison processing. In this case, a value obtained by adding an input value to the excitation current setting device 1 to a predetermined value (initial setting value set in the control panel 31a) is set as a target value.

  According to the above configuration, at the timing input to the periodic process starting means, it is possible to start the periodic process in which the exciting current is a target value obtained by adding the input value to the predetermined value. As a result, a value to be added to the excitation current can be easily set, and excitation can be started at a desired timing.

  In addition, the excitation power source 200 used for the superconducting magnet 12 of the present embodiment inputs the excitation state display means (LED of the excitation button 34) and the excitation button 34 for displaying a display mode indicating that excitation is complete or excitation is completed. Excitation state display control in which the display mode of the excitation state display means is excited (LED is lit) at the timing and the display state of the excitation state display means is excitation completed (LED is turned off or blinking) when there is no difference in the periodic processing. And a means (periodic processing control unit 33).

  According to the above configuration, when the control target value transmitted to the power circuit 9 as the current command is increased / decreased every predetermined period, the display mode of the excitation state display means indicates that the excitation is being performed, and the control target value is the reaching target value. In this case, the display state of the excitation state display means indicates completion of excitation. Thereby, the excitation state can be clearly displayed.

  In addition, the excitation power sources 100 and 200 used for the superconducting magnet 12 of the present embodiment include periodic processing stop means (excitation button 34) capable of inputting a stop timing for stopping repetition of periodic processing, and during periodic processing start, The periodic processing state display means (LED of the excitation button 34) for displaying a display state indicating that the periodic processing is stopped, and the display form of the periodic processing state display means based on the start timing is the period processing start (LED is lit or blinking) And a periodic processing state display control unit (periodic processing control unit 33) for setting the display mode of the periodic processing state display unit based on the stop timing to stop the periodic processing (the LED is turned off). The periodic processing is stopped based on the timing.

  According to the above configuration, the periodic process is controlled by the periodic process start unit and the periodic process stop unit. Further, the periodic process state display means can display whether or not the periodic process is started. Thereby, the periodic process is executed, and it can be clearly distinguished whether or not the input to the excitation current setting device 1 is immediately reflected in the periodic process.

  In addition, the excitation power sources 100 and 200 used for the superconducting magnet 12 of the present embodiment set a ratio for calculating the magnetic field strength value generated by the superconducting magnet 12 from the current value indicated by the current command to the power circuit 9. A ratio setting means (control panel 31a) and a magnetic field intensity display means (display control unit 32, display panel) for displaying the current target value based on the input to the excitation current setting device 1 as a magnetic field intensity value based on the ratio. 31b).

  According to the above configuration, the ratio between the current value to the superconducting magnet 12 and the magnetic field strength value generated by the superconducting magnet 12 is set, and the current reaching target value based on the input to the excitation current setting device 1 is used as the magnetic field strength value. It can be displayed. As a result, the excitation current can be set while confirming the magnetic field intensity calculated by the set ratio.

  The excitation power source 300 used for the superconducting magnet 12 according to the present embodiment is an excitation power source for the superconducting magnet 12 including the power circuit 9 for controlling the current for exciting the superconducting magnet 12 to a constant current value. The excitation current increase / decrease unit 20 that can be used, the current sweep rate setting means (control panel 331a) that sets the current change amount allowed per predetermined period, and the ratio based on the input from the excitation current increase / decrease unit 20 as the current change amount. Periodic process control means for executing a periodic process having a current increase / decrease amount calculation process by multiplication and a command process for giving a current command to the power circuit 9 based on the current increase / decrease amount at predetermined intervals. A periodic processing control unit 333).

  According to the said structure, the ratio with respect to the set current change amount can be input by the input by analog operation. In the cycle processing, the current change amount is multiplied by the input ratio value to calculate a current increase / decrease amount for each predetermined cycle, and a current command is issued to the power circuit 9. As a result, an intuitive interface that allows manual analog operation at a desired timing can be provided. Further, the current value commanded to the power circuit 9 is controlled so as not to exceed the set current change amount per predetermined period, regardless of any fluctuation in the input by the analog operation. Quenching due to the change in the excitation current can be prevented.

  Further, the excitation power source 300 used for the superconducting magnet 12 of the present embodiment is an increase / decrease amount that sets a ratio between the current change amount per predetermined period and the change amount of the magnetic field intensity generated by the superconducting magnet 12 due to the current change amount. Ratio setting means (control panel 331a) and magnetic field strength display means (display control unit 332, display panel 31b) for displaying the ratio based on the input to the excitation current increase / decrease device 20 as the amount of change in magnetic field strength based on the ratio. And further comprising.

  According to the above configuration, the ratio of the adjustment current change amount to the superconducting magnet 12 and the change amount of the magnetic field intensity generated by the superconducting magnet 12 is set, and the current increase / decrease calculated based on the input to the excitation current increase / decrease unit 20 is set. The amount can be displayed as a change amount of the magnetic field strength. Thereby, it is possible to input a ratio with respect to the current change amount while confirming the change amount of the magnetic field intensity calculated by the set ratio.

(Modification)
The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various modifications can be made as long as they are described in the claims.

  For example, in each of the first to third embodiments, the excitation current setting unit 1 and the excitation current increase / decrease unit 20 are provided, but the present invention is not limited to this. For example, the first embodiment and the second embodiment may be combined, the first embodiment and the third embodiment may be combined, or all may be combined. May be.

  The exciting current setting device 1 and the exciting current increasing / decreasing device 20 are rotary analog input devices, but are not limited thereto. For example, a slide type analog input device may be used.

  Moreover, although the exciting current setting device 1 and the exciting current increasing / decreasing device 20 have variable resistors, the present invention is not limited to this. For example, the exciting current setting device 1 and the exciting current increasing / decreasing device 20 may have a pulse encoder. Accordingly, the converter 11 may have a counter.

  Moreover, although various settings are performed by the control panel 31a, it may be performed by a predetermined application by connecting a PC or the like.

  Moreover, although the exciting current setting device 1 and the exciting current increasing / decreasing device 20 are provided in the remote controller 30, they are not limited to this. For example, it may be provided integrally with the main body 31.

  In the third embodiment, in consideration of a minute signal remaining in the variable resistance of the exciting current increasing / decreasing unit 20, a resistance value corresponding to an angle of about ± 2% may be controlled as 0%. Thereby, malfunction due to noise can be prevented.

  In the present embodiment, the same current sweep rate is used for control when the exciting current is increased and decreased, but the present invention is not limited to this. For example, the current sweep rate at the time of rising and at the time of falling may be settable.

  In addition, a configuration in which a demagnetizing button is separately provided as an input device for demagnetizing (0 A) the exciting current and setting the magnetic field to zero by completing the work on the target current. More specifically, when there is an input to the demagnetizing button, the periodic processing is executed to ignore the values of the exciting current setting unit 1 of the remote controller 30 and the exciting current increase / decrease unit 20 of the remote controller 330 and set the target value to 0A. There may be. Thereby, demagnetization can be easily performed. Further, the separate remote controllers 30 and 330 are not necessarily required, and the excitation current setting device 1 and / or the excitation current increasing / decreasing device 20 may be provided on a panel surface such as the front surface of the excitation power sources 100, 200, and 300.

  In addition, each structure in this embodiment is not limited to the structure by either software or hardware.

DESCRIPTION OF SYMBOLS 1 Excitation current setting device 4 Control target value memory | storage 5 Next control target value calculation part 6 Comparison part 9 Power circuit 11 Converter 12 Superconducting magnet 14 Current increase / decrease amount calculation part 20 Excitation current increase / decrease unit 31a / 331a Control panel 31b Display panel 33 333 Periodic processing control unit 32/332 Display control unit 34 Excitation button 100/200/300 Excitation power supply

Claims (7)

An excitation power source for a superconducting magnet equipped with a power circuit that controls the excitation current to the superconducting magnet,
Excitation current setting device that can be input by analog operation,
Control target value storage means for storing a control target value of the exciting current for each predetermined period;
Current sweep rate setting means for setting a current change amount allowed per the predetermined period;
A comparison process for calculating the difference between the excitation target value and the control target value based on the input to the excitation current setter, and if there is a difference, the control target value is determined according to whether the difference is positive or negative. Next, a control target value calculation process for storing the current change amount added or subtracted in the control target value storage means as a new control target value, and a current command based on the new control target value in the power circuit. An excitation power source for a superconducting magnet, comprising: periodic processing control means for executing periodic processing having current command processing for each predetermined cycle. Further comprising a periodic processing start means capable of inputting a start timing for starting the repetition of the periodic processing;
The periodic process control means starts the periodic process based on the start timing, and sets the target value to be a value obtained by adding an input value to the excitation current setter to a predetermined value in the comparison process. The exciting power supply for the superconducting magnet according to claim 1. Excitation state display means for displaying a display mode indicating that excitation is complete or excitation is completed,
Excitation state display control in which the display mode of the excitation state display means is being excited when there is the difference in the periodic processing, and the display mode of the excitation state display means is excitation completed when there is no difference in the periodic processing. The exciting power supply for a superconducting magnet according to claim 2, further comprising means. Periodic processing stop means capable of inputting a stop timing for stopping the repetition of the periodic processing;
Periodic processing state display means for displaying a display mode indicating that cyclic processing is starting or cyclic processing is stopped;
Periodic processing state display control means for setting the display mode of the periodic processing state display means based on the start timing to be during periodic processing start, and setting the display mode of the periodic processing state display means to be periodic processing stopped based on the stop timing. In addition,
4. The excitation power source for a superconducting magnet according to claim 2, wherein the periodic processing control means stops the periodic processing based on the stop timing. Ratio setting means for setting a ratio for calculating the magnetic field strength value generated by the superconducting magnet from the current value indicated by the current command to the power circuit;
The superconductivity according to any one of claims 1 to 4, further comprising: a magnetic field strength display means for displaying, as the magnetic field strength value, a current reaching target value based on an input to the excitation current setting device based on the ratio. Magnet excitation power supply. An excitation power source for a superconducting magnet having a power circuit that controls a current for exciting the superconducting magnet to a constant current value.
Exciting current increase / decrease unit that can be input by analog operation,
Current sweep rate setting means for setting the amount of current change allowed per predetermined period;
A current increase / decrease amount calculation process for calculating a current increase / decrease amount by multiplying the current change amount by a ratio based on an input from the excitation current increase / decrease unit; and a command process for performing a current command based on the current increase / decrease amount to the power circuit; An excitation power source for a superconducting magnet, comprising: periodic processing control means for executing periodic processing having the above-mentioned values every predetermined period. Increase / decrease amount ratio setting means for setting a ratio between the current change amount per the predetermined period and the change amount of the magnetic field intensity generated by the superconducting magnet due to the current change amount;
The current of the excitation power source for the superconducting magnet according to claim 6, further comprising: a magnetic field intensity display means for displaying the ratio based on the input to the excitation current multiplier based on the ratio as a change amount of the magnetic field intensity. Setting device.

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