JP5275274B2 - Electromagnetic pump system and compensation power supply - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain the requested electrical output characteristics without external control, as a compensating power supply device for an electromagnetic pump system. <P>SOLUTION: The electromagnetic pump system includes an electromagnetic pump 10 connected to an external AC power supply 15 and the compensating power supply device 11 connected to the external AC power supply 15 and the electromagnetic pump 10. The compensating power supply device 11 has an exciter rotor coil 18 fixed to a shaft, an exciter stator 22 which is arranged to face the exciter rotor coil 18 and uses a permanent magnet 23, a rotary rectifier 19 which is fixed to the shaft and rectifies an AC current generated in the exciter rotor coil 18 to produce a DC current, a synchronous machine rotor coil 20 which is fixed to the shaft and supplied with the DC current from the rotary rectifier 19, and a synchronous machine stator coil 26 which is arranged to face the synchronous machine rotor coil 20 and connected to the external AC power supply 15 and the electromagnetic pump 10. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an electromagnetic pump system suitable for a nuclear reactor system and the like, and a compensation power supply apparatus suitable for an electromagnetic pump system and the like.

  In a nuclear reactor system such as a fast breeder reactor that uses conductive sodium metal as a coolant, for example, a mechanical sodium pump has been conventionally used to circulate the coolant. As a drive source of this mechanical sodium pump, an induction motor is employed as in the case of other general-purpose pumps, and its operation control method has been established.

  When an abnormality occurs in an operating reactor, a reactor scram is generated in which control rods are rapidly inserted into the reactor core, resulting in a transient temperature difference in the coolant at the core entrance and exit. The structure material may be subjected to a large impact. In addition, if the sodium temperature in the core becomes too high after scram, the fuel cladding may be damaged and radiation may leak out of the reactor.

  In order to mitigate such thermal transients and maintain the soundness of the structural material and fuel, the circulation pump has a function that gradually reduces the flow rate of the coolant without suddenly stopping, that is, It is desirable to have a flow coast down characteristic. When a mechanical pump is applied to the circulation pump, the pump impeller after the power is shut off due to the inertial force retained by the rotor of the induction motor and the inertial force such as the flywheel integrally attached to the rotating shaft. The flow coast down characteristic is obtained by rotating for a while.

  On the other hand, in place of the conventional mechanical sodium pump, an electromagnetic pump has recently been increasingly employed. This electromagnetic pump uses the fact that liquid metal sodium is a good electrical conductor, and when a conductor through which current flows is placed in a magnetic field, it receives a force in the direction perpendicular to the magnetic field strength. It transports sodium coolant.

  Compared with conventional mechanical sodium pumps, this electromagnetic pump can easily adjust the coolant flow rate, can be completely sealed, and is small so that it is not restricted by installation location. It has excellent features such as no moving parts, easy maintenance and repair, and high discharge pressure.

  Conventionally, in a relatively small capacity electromagnetic pump, a transformer is directly connected to the electromagnetic pump for constant flow operation, or an electric device having a variable transformer function such as an induction voltage regulator is directly connected to the electromagnetic pump. Thus, the flow rate is controlled by voltage control.

  Further, as disclosed in Patent Document 1, it is known to control the flow rate by directly connecting an inverter to an electromagnetic pump, making the voltage constant, and changing only the frequency. Furthermore, as disclosed in Patent Document 2, it is also known to perform flow rate control by changing both voltage and frequency by a power source of a variable transformer and an inverter.

Japanese Utility Model Publication No. 60-84159 Japanese Utility Model Publication No. 60-84160

  Since electromagnetic pumps do not have rotating parts, kinetic energy cannot be stored unlike conventional mechanical pumps when the drive power is cut off during a reactor scram. There is a characteristic that the flow rate of the material rapidly decreases.

  Therefore, when an electromagnetic pump is used in a nuclear reactor, it is necessary to allow a considerable margin in the design standards for core structural materials in order to respond to thermal transients in the event of an abnormality without any problem. There was a problem of adopting. In addition, in order to impart flow coast down characteristics that alleviate the thermal transient, it is necessary to equip some energy storage means, and development of an economical and effective means has been demanded.

  In the prior art, a control circuit is used in the compensation power supply device in order to obtain the attenuation output characteristic required for the electromagnetic pump applied to the main circulation pump of the fast breeder reactor during the flow coast down. However, it is difficult to make the control circuit redundant (diversification / multiplexing) for ensuring the safety function, and there is a problem in ensuring the necessary reliability.

  The present invention has been made to solve the above-described problems, and provides a highly reliable compensation power supply device capable of obtaining required electrical output characteristics without external control, and an electromagnetic wave using such a compensation power supply device. An object is to provide a pump system.

In order to achieve the above object, one aspect of a compensation power supply apparatus according to the present invention has a magnetic bearing function and a bearing configured to exhibit a mechanical bearing function when the magnetic bearing function is lost , A shaft rotatably supported by the bearing, an exciter rotor coil fixed to the shaft, and an exciter stator using a permanent magnet, which is stationaryly disposed facing the exciter rotor coil; A rotary rectifier fixed to the shaft and rectifying an alternating current generated in the exciter rotor coil into a direct current, and a synchronous machine rotor fixed to the shaft and supplied with a direct current from the rotary rectifier a coil, said is still arranged to face the synchronous machine rotor coil synchronous machine stator coils connected in parallel to an external AC power supply and an external AC powered devices, solid to the shaft A plurality of flywheels, wherein at least one flywheel of the plurality of flywheels is detachable from the shaft, and a control circuit for adjusting output when the external power source is lost It is characterized in that an electric output having a predetermined characteristic can be output without using the .

The electromagnetic pump system according to the present invention is an electromagnetic pump system including an electromagnetic pump connected to an external AC power supply, and a compensation power supply device connected in parallel to the external AC power supply and the electromagnetic pump, The compensation power supply device has a magnetic bearing function, a bearing configured to exhibit a mechanical bearing function when the magnetic bearing function is lost, a shaft rotatably supported by the bearing, and the shaft A fixed exciter rotor coil, an exciter stator using a permanent magnet, which is stationaryly disposed opposite to the exciter rotor coil, and a fixed to the shaft, the exciter rotor coil A rotary rectifier that rectifies the generated alternating current into direct current, a synchronous machine rotor coil that is fixed to the shaft and supplied with direct current from the rotary rectifier, Serial are still arranged to face the synchronous machine rotor coil comprises a synchronous machine stator coils connected in parallel to the external AC power supply and electromagnetic pump, and a plurality of flywheel fixed to the shaft, At least one flywheel of the plurality of flywheels can be attached to and detached from the shaft, and when the external power source is lost, an electric output having a predetermined characteristic can be output without using an output adjustment control circuit. It is comprised as follows.
Another aspect of the compensation power supply apparatus according to the present invention includes a bearing, a shaft rotatably supported by the bearing, an exciter rotor coil fixed to the shaft, and the exciter rotor. An exciter stator using a permanent magnet, which is stationaryly arranged facing the coil, a rotary rectifier fixed to the shaft and rectifying an alternating current generated in the exciter rotor coil into a direct current, and the shaft Fixed to the synchronous machine rotor coil to which the direct current from the rotary rectifier is supplied, and stationaryly opposed to the synchronous machine rotor coil and connected in parallel to the external AC power source and the external AC power receiving device. A synchronous machine stator coil, and a magnetic flux adjusting coil that is stationaryly disposed between the exciter stator and the exciter rotor coil and is connected to an external AC power source.

  ADVANTAGE OF THE INVENTION According to this invention, the highly reliable compensation power supply device which can acquire a request | requirement electrical output characteristic without control from the outside, and the electromagnetic pump system using such a compensation power supply device can be provided.

It is a schematic diagram which shows the electrical constitution of 1st Embodiment of the electromagnetic pump system which concerns on this invention. It is a typical longitudinal cross-sectional view which shows the mechanical structure of the compensation power supply device in the electromagnetic pump system of FIG. It is a graph which shows the time change of the flow volume and voltage at the time of the flow coast down of the electromagnetic pump in the electromagnetic pump system of FIG. 1 by a relative value. It is a schematic diagram which shows the structure of 2nd Embodiment of the electromagnetic pump system which concerns on this invention.

[First Embodiment]
A first embodiment of an electromagnetic pump system according to the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a schematic diagram showing an electrical configuration of the electromagnetic pump system of the first embodiment. FIG. 2 is a schematic longitudinal sectional view showing a mechanical structure of a compensation power supply device in the electromagnetic pump system of FIG.

  This electromagnetic pump system is for circulating a coolant in a nuclear reactor system such as a fast breeder reactor using a conductive coolant such as metallic sodium. The electromagnetic pump system includes an electromagnetic pump 10, a compensation power supply device 11, a circuit breaker 12, and an inverter 13. The electromagnetic pump 10 has a field winding 14, and this field winding 14 is connected to an external three-phase AC power supply 15 through a circuit breaker 12 and an inverter 13.

  The inverter 13 is for converting the frequency of the external three-phase AC power supply 15 and includes an AC / DC converter and a DC AC / converter.

  The compensation power supply device 11 includes a bearing (described later) and a shaft 17 that is rotatably supported by the bearing. An exciter rotor coil 18, a rotary rectifier 19, a synchronous machine rotor coil 20 and a flywheel 21 are attached to the shaft 17 and are configured to rotate integrally.

  An exciter stator 22 is disposed on the stationary side facing the exciter rotor coil 18 in a non-contact manner. The exciter stator 22 has a permanent magnet 23 and an exciter stator coil 24. The exciter stator coil 24 is connected to the external three-phase AC power supply 15 via the first control power supply 25. The exciter is composed of the exciter rotor coil 18 and the exciter stator 22.

  A synchronous machine stator coil (electron coil) 26 is arranged on the stationary side facing the synchronous machine rotor coil 20 in a non-contact manner. The synchronous machine stator coil 26 is branched and connected from the wiring connecting the field winding 14 of the electromagnetic pump 10 and the circuit breaker 12. A synchronous machine is constituted by the synchronous machine rotor coil 20 and the synchronous machine stator coil 26.

  In the illustrated example, the shaft 17 is horizontally supported by two radial bearings 27 and one thrust bearing 28. Both the radial bearing 27 and the thrust bearing 28 have a magnetic bearing structure.

  As the radial bearing 27, a radial bearing permanent magnet 29 is attached to the shaft 17 side, and a radial bearing winding 30 is disposed on the stationary side of the radial bearing permanent magnet 29 in a non-contacting position on the radially outer side. . Electric power (not shown) is supplied to the radial bearing winding 30 to generate magnetic force, and the shaft 17 is supported in a floating state by interaction with the radial bearing permanent magnet 29.

  As the thrust bearing 28, a hook-shaped thrust bearing guide 31 extending in the radial direction and the circumferential direction is attached to the shaft 17 side, and the thrust bearing winding 32 is sandwiched between the thrust bearing guide 31 from both sides in the axial direction without contact. Is stationary. Electric power (not shown) is supplied to the thrust bearing winding 32 to generate a magnetic force, and the axial movement of the shaft 17 is suppressed by the interaction with the thrust bearing guide 31.

  Next, the operation of the first embodiment will be described.

  During normal operation, a three-phase alternating current is supplied from the external three-phase alternating current power supply 15 to the field winding 14 of the electromagnetic pump 10 via the inverter 13 and the circuit breaker 12, and the electromagnetic pump 10 conducts a conductive material such as a liquid metal. A fluid (not shown) is driven.

  Further, a three-phase AC current is supplied from the external three-phase AC power supply 15 to the synchronous machine stator coil 26 via the inverter 13 and the circuit breaker 12, and further from the external three-phase AC power supply 15 via the first control power supply 25. Thus, a three-phase alternating current is supplied to the exciter stator coil 24.

  When an alternating current is supplied to the exciter stator coil 24, a rotating magnetic field is formed, and an induced voltage is excited in the exciter rotor coil 18. The voltage excited by the exciter rotor coil 18 is converted into a direct current by the rotary rectifier 19 and a magnetic flux is formed by the synchronous machine rotor coil 20.

  On the other hand, a magnetic flux is formed in the synchronous machine stator coil 26 by the current supplied from the external three-phase AC power supply 15. A rotational force is generated by the magnetic repulsion force or attractive force of the magnetic flux of the synchronous machine stator coil 26 and the synchronous machine rotor coil 20, and the shaft 17 starts to rotate.

  After starting, after the rotational speed of the shaft 17 has increased to the first predetermined rotational speed, the power supply to the exciter stator coil 24 is stopped, and the magnetic flux formed by the permanent magnet 23 of the exciter stator 22; An induction voltage is induced in the exciter by the rotation of the exciter rotor coil 18, and a magnetic flux is formed by the synchronous machine rotor coil 20 to generate torque of the synchronous machine to increase the rotational speed of the shaft 17. Since the excitation power is generated by the permanent magnet 23 as the rotation speed increases, the excitation is stopped after the rotation speed of the shaft 17 has increased to the second predetermined rotation speed.

  During normal operation, the shaft 17 maintains a predetermined constant rotational speed.

  Here, it is assumed that the external three-phase AC power supply 15 is instantaneously stopped due to some failure or accident. In this case, power supply from the external three-phase AC power supply 15 to the field winding 14 of the electromagnetic pump and the synchronous machine stator coil 26 is stopped. However, due to the moment of inertia of the flywheel 6 of the compensation power supply device 11, the rotation of the shaft 17 does not stop instantaneously, but continues to rotate to some extent while gradually decelerating.

  At this time, since the permanent magnet 23 of the exciter stator 22 generates magnetic flux even without the external three-phase AC power supply 15, an induced voltage is induced in the exciter rotor coil 18. The exciter current is converted to direct current by the rotary rectifier 19 and an excitation voltage is induced in the synchronous machine rotor coil 20. Since the synchronous machine rotor coil 20 is rotating, an induced voltage is generated in the synchronous machine stator coil 26, and power can be supplied from the synchronous machine stator coil 26 to the field winding 14 of the electromagnetic pump 10. That is, in this embodiment, kinetic energy is stored by rotating the flywheel 21 during normal operation, and the kinetic energy is converted into electrical energy and supplied to the electromagnetic pump 10 in the event of a power loss. Thus, it is possible to avoid an instantaneous stop of the electromagnetic pump 10 and to perform an operation that gradually stops over time while the electromagnetic pump 10 is driven to some extent.

  In the electromagnetic pump for driving the coolant of the nuclear reactor, as a safety requirement, when the external power source is lost, the flow rate decreases exponentially as shown by the dotted line 40 in FIG. Is required. This process of decreasing the flow rate is called flow coast down. In order to realize the flow coast down indicated by the dotted line 40 in FIG. 3 by the electromagnetic pump 10, it is necessary to change the electromagnetic pump voltage indicated by the solid line 41 in FIG. 3 in the field winding 14 of the electromagnetic pump 10. Moreover, as a safety requirement, it is required to realize the characteristics shown in FIG. 3 without using a special control circuit due to the loss of the external power supply.

  In this embodiment, such a safety requirement can be satisfied. The reason will be described next.

  In order to obtain the flow coast down characteristic, the input power of the field winding 14 of the electromagnetic pump 10 needs to be decreased exponentially. In order to obtain this input power, the voltage of the electromagnetic pump 10 needs to be a value proportional to the square of the frequency.

  After the loss of the external three-phase AC power supply 15, the rotational energy of the compensation power supply device 11 is reduced by supplying electric energy to the electromagnetic pump 10.

  Since the induced voltage of the exciter is proportional to the number of revolutions, the current of the exciter rotor coil 18 flowing by the voltage, that is, the armature current If of the exciter is the number of revolutions of the exciter rotor (rotation speed of the shaft 17) n. Will decrease in proportion to the first order.

If = a × n (a is a proportionality constant) (1) This excitation current If becomes the synchronous machine excitation current, and the synchronous machine magnetic flux Bf is linearly proportional to the excitation current If.

Bf = b × If (b is a proportionality constant) (2) As a result, the synchronous machine magnetic flux density Bf decreases linearly with the rotational speed n.

Bf = b ′ × n (b ′ is a proportional constant) (3) On the other hand, the induction voltage Vg of the synchronous machine is proportional to the time change of the synchronous machine magnetic flux φ.

Vg = c × dφ / dt (c is a proportional constant) (4) The time change of the synchronous machine magnetic flux φ is proportional to the product of the synchronous machine magnetic flux density Bf and the rotational speed n.

dφ / dt = c ′ × Bf × n (where c ′ is a proportional constant) (5) Formula When substituting Formula (5) into Formula (4), Vg = c × c ′ × Bf × n ( 6) Expression When Expression (3) is substituted into Expression (6), Vg = c × c ′ × b ′ × n × n
= E × n × n (e is a proportional constant) (7) That is, the size of the synchronous machine magnetic flux density Bf decreases in proportion to the rotational speed n, and the time change of the synchronous machine magnetic flux φ also rotates at the same time. Since it decreases in proportion to the number n, the induced voltage Vg of the synchronous machine decreases in proportion to the square of the rotational speed.

Vg = e × n ²
From the above, it can be seen that when the rotational energy of the flywheel 21 is converted into electric energy and taken out, a voltage of the synchronous machine proportional to the square of the rotational speed of the flywheel 21 is generated. Since the voltage and flow rate of the electromagnetic pump 10 are proportional, the voltage generated by the synchronous machine is supplied to the electromagnetic pump 10 so that the flow rate of the electromagnetic pump 10 decreases in proportion to the square of the rotational speed. .

  By adjusting the weight and size of the flywheel 21, the slope of the graph of the flow coast down characteristic can be matched with the slope of the voltage generated by the synchronous machine.

  According to this embodiment, it is possible to obtain the electrical output of the compensation power source 11 corresponding to the required flow coast down characteristics of the electromagnetic pump 10 without using a control circuit for output adjustment. Therefore, since the plant does not stop due to a failure of the control circuit, the reliability and economic efficiency of the reactor system can be improved.

  Further, according to this embodiment, since the exciter stator coil 24 is installed separately from the permanent magnet 23 of the exciter stator 22 in order to start the compensation power supply device 11, no brush is used. Therefore, maintainability and reliability can be improved.

  In addition, according to this embodiment, since the magnetic bearing is used to support the rotation of the shaft 17, almost no friction is generated, and the large-scale lubrication required for cooling the frictional heat by the conventional mechanical bearing is performed. Auxiliary equipment such as oil (oil unit, gear unit, pony motor, etc.) is not required. Therefore, it is possible to greatly reduce the risk of nuclear equipment stoppage due to a failure of auxiliary equipment and improve reliability. Further, since maintenance of auxiliary equipment is not required, the economy can be improved.

[Second Embodiment]
A second embodiment of the electromagnetic pump system according to the present invention will be described with reference to FIG. FIG. 4 is a schematic diagram showing an electrical configuration of the electromagnetic pump system of the second embodiment. Here, the same or similar parts as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted. In this embodiment, a magnetic flux adjusting coil 45 is installed on the stationary side between the permanent magnet 23 of the exciter stator 22 and the exciter rotor coil 18. The magnetic flux adjustment coil 45 is connected to the external three-phase AC power supply 15 via the second control power supply 46. Other configurations are the same as those of the first embodiment.

  In this embodiment, after the compensation power supply device 11 is started, the rotational speed of the shaft 17 increases and reaches a predetermined rotational speed, and then the magnetic flux adjustment coil from the external three-phase AC power supply 15 via the second control power supply 46. An alternating current is supplied to 45. As a result, it is possible to generate a magnetic flux in the direction opposite to the magnetic flux formed by the permanent magnet 23 of the exciter stator 22 and to reduce the synthesized magnetic field. As a result, the exciting current of the operating synchronous machine can be adjusted, and the operating efficiency of the synchronous machine can be optimized. Even when the function of the magnetic flux adjusting coil 45 is lost for some reason, the operation can be continued by the permanent magnet 23 of the exciter stator 22.

  When the external three-phase AC power supply 15 is lost, no current flows through the magnetic flux adjusting coil 45, and the magnetic flux in the direction opposite to that of the permanent magnet 23 disappears. Therefore, when the external three-phase AC power supply 15 is lost, a current having a magnitude required by the exciter can be passed.

[Other Embodiments]
The embodiments described above are merely examples, and the present invention is not limited to these.

  For example, in the above-described embodiment, the compensation power supply device 11 is exemplified as being used for the electromagnetic pump 10 of the nuclear reactor system. However, the compensation power supply device 11 can be used as a compensation power supply device for electromagnetic pumps for other uses and other various AC power receiving devices.

  Moreover, although the compensation power supply apparatus 11 of the said embodiment uses the magnetic bearing, it is also possible to use a mechanical bearing instead of this magnetic bearing. By doing so, the control circuit for the magnetic bearing becomes unnecessary, and the control circuit is not used at all in the compensation power supply apparatus. Therefore, the reliability is improved and it can be used as a compensation power supply apparatus applicable to a safety system. However, since a mechanical bearing is used, maintenance is required.

  In addition, the compensation power supply apparatus may be configured not to use only magnetic bearings, but to install both magnetic bearings and mechanical bearings in case of loss of magnetic bearing functions due to loss of external three-phase AC power. it can. In that case, since a magnetic bearing is normally used, a control circuit is required. However, when an external three-phase AC power supply is lost, a magnetic bearing is not used but a mechanical bearing is used. Therefore, since the control circuit is not used when the power is turned off, it can be applied to a safety system and the reliability can be improved.

  If both the magnetic bearing and the mechanical bearing are installed and the magnetic bearing stops functioning, the shaft cannot float and is supported by the mechanical bearing while rotating. Therefore, friction occurs at the contact surface between the shaft and the mechanical bearing, and the rotational energy decreases. In order to ensure the required output voltage even when the magnetic bearing is touched down, it is preferable to use a material having a low friction coefficient and sufficient strength as a material for the shaft and the mechanical bearing. As a result, the electrical output required for the flow coast down can be secured, and the reliability can be improved.

  Moreover, in the compensation power supply apparatus of the said embodiment, although the shaft 17 shall be extended horizontally, the shaft 17 may not be horizontal, for example, may be extended vertically. In that case, since the load of the rotating body is applied to the thrust bearing and the load of the rotating body is not applied to the radial bearing, the design of the bearing is naturally different from the above embodiment.

  In the above embodiment, the exciter stator coil 24 and the first control power supply 25 are provided to start the compensation power supply device 11. However, these are eliminated and a slip ring and a brush (not shown) are used. It is also possible to start. In that case, a slip ring is provided on the shaft 17, and a brush supplied with electric power obtained by converting alternating current into direct current from an external three-phase alternating current power supply 15 through a rectifier (not shown) is brought into contact with the slip ring. Thereby, a current is passed through the synchronous machine rotor coil 20 to form a magnetic flux. The subsequent steps are the same as the starting method of the first embodiment. After rotation, separate the brush from the slip ring.

  Further, it is also possible to start the compensation power supply apparatus by connecting a pony motor to the shaft without using a slip ring and a brush.

  In the said embodiment, the flywheel 21 was attached to the shaft 17, and it enabled it to hold | maintain a big rotational energy by rotating this. The flywheel 21 is used to increase the rotational moment of the entire rotating body. However, if the rotational moment of the shaft 17 and the entire rotating body rotating together with the shaft 17 is sufficiently large, a special flywheel 21 is not necessarily used. The wheel 21 may not be attached. If the flywheel 21 is not attached in this way, the number of parts is reduced and the structure is simplified.

  In addition, since the temperature of the synchronous machine rotor coil 20 may rise when an excitation current is applied to the synchronous machine rotor coil 20, increasing the rotation radius of the synchronous machine rotor coil 20 improves the cooling performance. This is preferable, and at the same time, the effect of increasing the rotational moment can be obtained.

  Furthermore, the number of flywheels 21 attached to the shaft 17 is not limited to one, and a plurality of flywheels 21 may be provided. Further, the flywheel 21 may be detachable so that the stored rotational energy of the flywheel 21 can be adjusted. As a result, the slope of the characteristic curve of the power supplied from the compensation power supply device 11 can be changed. Since the characteristic curve of the power supply can be changed by adjusting the number of flywheels 21, it can be applied to any nuclear equipment that requires the compensation power supply device 11, and has high expandability.

DESCRIPTION OF SYMBOLS 10 Electromagnetic pump 11 Compensation power supply device 12 Circuit breaker 13 Inverter 14 Field winding 15 External three-phase alternating current power supply 17 Shaft 18 Exciter rotor coil 19 Rotary rectifier 20 Synchronous machine rotor coil 21 Flywheel 22 Exciter stator 23 Permanent Magnet 24 Exciter stator coil 25 First control power supply 26 Synchronous machine stator coil 27 Radial bearing 28 Thrust bearing 29 Radial bearing permanent magnet 30 Radial bearing winding 31 Thrust bearing guide 32 Thrust bearing winding 45 Magnetic flux adjusting coil 46 2 control power supply

Claims (5)

A bearing configured to have a magnetic bearing function and to exhibit a mechanical bearing function when the magnetic bearing function is lost ;
A shaft rotatably supported by the bearing;
An exciter rotor coil fixed to the shaft;
An exciter stator using a permanent magnet, which is stationaryly arranged opposite to the exciter rotor coil;
A rotary rectifier fixed to the shaft and rectifying an alternating current generated in the exciter rotor coil into a direct current;
A synchronous machine rotor coil fixed to the shaft and supplied with a direct current from the rotary rectifier;
A synchronous machine stator coil that is stationaryly arranged opposite to the synchronous machine rotor coil and connected in parallel to an external AC power source and an external AC power receiving device;
A plurality of flywheels fixed to the shaft;
Have
At least one flywheel of the plurality of flywheels is detachable from the shaft;
A compensation power supply device configured to output an electrical output having a predetermined characteristic without using an output adjustment control circuit when the external power supply is lost .   The compensation power supply apparatus according to claim 1, further comprising an exciter stator coil that is stationaryly disposed facing the exciter rotor coil and connected to an external AC power source.   The compensation according to claim 1, further comprising a magnetic flux adjustment coil that is stationaryly disposed between the exciter stator and the exciter rotor coil and is connected to an external AC power source. Power supply. An electromagnetic pump system comprising: an electromagnetic pump connected to an external AC power supply; and a compensation power supply device connected in parallel to the external AC power supply and the electromagnetic pump,
  The compensation power supply device
  A bearing configured to have a magnetic bearing function and to exhibit a mechanical bearing function when the magnetic bearing function is lost;
  A shaft rotatably supported by the bearing;
  An exciter rotor coil fixed to the shaft;
  An exciter stator using a permanent magnet, which is stationaryly arranged opposite to the exciter rotor coil;
  A rotary rectifier fixed to the shaft and rectifying an alternating current generated in the exciter rotor coil into a direct current;
  A synchronous machine rotor coil fixed to the shaft and supplied with a direct current from the rotary rectifier;
  A synchronous machine stator coil that is stationaryly arranged opposite to the synchronous machine rotor coil and connected in parallel to an external AC power source and an electromagnetic pump;
  A plurality of flywheels fixed to the shaft;
  Have
  At least one flywheel of the plurality of flywheels is detachable from the shaft;
  When the external power supply is lost, it is configured so that an electrical output having a predetermined characteristic can be output without using an output adjustment control circuit.
  Features an electromagnetic pump system. A bearing,
A shaft rotatably supported by the bearing;
An exciter rotor coil fixed to the shaft;
An exciter stator using a permanent magnet, which is stationaryly arranged opposite to the exciter rotor coil;
A rotary rectifier fixed to the shaft and rectifying an alternating current generated in the exciter rotor coil into a direct current;
A synchronous machine rotor coil fixed to the shaft and supplied with a direct current from the rotary rectifier;
A synchronous machine stator coil that is stationaryly arranged opposite to the synchronous machine rotor coil and connected in parallel to an external AC power source and an external AC power receiving device;
A magnetic flux adjusting coil that is stationaryly disposed between the exciter stator and the exciter rotor coil and connected to an external AC power source;
Compensating power supply having.

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