JP7179390B2 - Induction ring and induction ring cooling method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a vibration test apparatus for conducting vibration characteristic tests and endurance tests of industrial products such as aerospace equipment, automobile equipment, electronic products, and precision machinery, and more specifically, an induction vibration test apparatus. and a cooling method for the induction ring.

2. Description of the Related Art Conventionally, a vibration test using a vibration tester has been performed in order to conduct a vibration characteristic test and an endurance test of industrial products such as aerospace equipment, automobile equipment, electronic products, and precision equipment.

As vibration test apparatuses, an electrodynamic vibration test apparatus as disclosed in Patent Document 1 and an inductive vibration test apparatus are mainly known.
As shown in FIG. 9, the electrodynamic vibration test apparatus 100 has a movable portion 102 on which a device under test (not shown) is mounted, and a fixed portion 114 having a magnetic path member.

The fixed portion 114 includes, for example, a magnetic path member 116 made of a magnetically permeable material such as iron, and an exciting coil 118 that generates magnetic flux flowing through the magnetic path member 116 . The excitation coil 118 causes a constant magnetic flux to flow through the magnetic path member 116 by applying a DC voltage from a constant voltage source (not shown).

On the other hand, the movable portion 102 includes a test table 104 on which a device under test is mounted, a movable portion supporting spring 106 that connects the movable portion 102 and a fixed portion 114 and holds the movable portion 102 in a movable state, and a magnetic path member. and a drive coil 108 inserted into the air gap.

The driving coil 108 is attached so as to be orthogonal to the magnetic field (static magnetic field) generated by the exciting coil 118 , and by applying an alternating current to the driving coil 108 , the movable portion 102 can be vibrated. It should be noted that the magnitude of the vibration (exciting force) to be generated can be controlled by changing the magnitude of the alternating current flowing through the drive coil 108 .

On the other hand, as shown in FIG. 10, the induction type vibration test apparatus 200 has a movable part 202 on which a device under test (not shown) is mounted and a fixed part 214 having a magnetic path member. there is
The fixed portion 214 includes a magnetic path member 216 made of a magnetically permeable material such as iron, an exciting coil 218 that generates magnetic flux flowing through the magnetic path member 216, and an induction ring 208 of the movable portion 202, which will be described later. and a stator coil 220 that magnetically couples with and generates an alternating current. The excitation coil 218 causes a constant magnetic flux to flow through the magnetic path member 216 by applying a DC voltage from a constant voltage source (not shown).

On the other hand, the movable portion 202 includes a test table 204 on which a device under test is mounted, a movable portion supporting spring 206 that connects the movable portion 202 and a fixed portion 214 and holds the movable portion 202 in a movable state, a stator coil 220, a guide ring 208 inserted into the cavity of 222;

With this configuration, by passing an alternating current through the stator coils 220 and 222, the stator coils 220 and 222 are used as a pair of primary coils, and the induction ring 208 is used as a secondary coil. A current is generated.

Accordingly, the magnetic field generated by the excitation coil 218 and the magnetic field generated by the induction ring 208 can vibrate the movable portion 202 . By changing the magnitude of the alternating current that flows through the stator coils 220 and 222, the magnitude of vibration (exciting force) to be generated can be controlled.

JP-A-2000-121490

In such an induction vibration test apparatus 200, a single ring, that is, a one-turn coil is generally used as the induction ring 208 (eg, Patent Document 1). The induction ring 208 has a problem of heat generation because a current flows through it according to the principle of electromagnetic induction. Specifically, when the temperature of the induction ring 208 rises due to heat generation, the resistance value rises and the magnitude of the alternating current generated in the induction ring 208 changes. As a result, the magnitude of the magnetic field generated by the induction ring 208 also changes, and there is a problem that the magnitude of the generated vibration (exciting force) does not follow the expected control.

In view of the current situation, the present invention solves the problem of heat generation in an induction vibration tester and provides a cooling device for the induction ring used in the vibration tester that can increase the excitation force obtained. The purpose is to provide a method.

The present invention was invented to solve the problems in the prior art as described above, and the induction ring of the present invention is:
a movable part on which the device under test is mounted;
A vibration test apparatus comprising a magnetic path member having magnetic permeability and a fixed portion having magnetic flux generating means for generating magnetic flux flowing through the magnetic path member,
An induction ring that is provided at the bottom of the movable part and generates an alternating current by electromagnetic induction by applying an alternating voltage to a stator coil that is magnetically coupled in a state of being inserted into the gap of the magnetic path member. There is
A multi-layer structure in which multiple induction rings are stacked,
It is characterized by having a cooling pipe through which a cooled circulating cooling liquid is sent between the induction rings of the multi-layered structure.

Further, the cooling method of the induction ring of the present invention includes:
a movable part on which the device under test is mounted;
A vibration test apparatus comprising a magnetic path member having magnetic permeability and a fixed portion having magnetic flux generating means for generating magnetic flux flowing through the magnetic path member,
An induction ring that is provided at the bottom of the movable part and generates an alternating current by electromagnetic induction by applying an alternating voltage to the stator coil that is magnetically coupled in a state of being inserted into the gap of the magnetic path member. A cooling method comprising:
The induction ring is an induction ring with a multi-layer structure in which a plurality of induction rings are stacked,
A cooling pipe is provided between the multi-layer induction rings, and a cooling liquid is circulated through the cooling pipe.

In such an induction ring cooling method, the flow rate of the cooling liquid can be controlled based on the temperature of the induction ring.

Further, the flow rate of the coolant can be controlled based on the AC voltage value and/or the AC current value applied to the stator coil.

Also, the induction ring can be sprayed with a spray coolant.
Also, the induction ring can be cooled by a cooling blower.

According to the present invention, by circulating the cooling liquid between the multi-layered induction rings, it is possible to sufficiently cool the inner layers of the induction rings, thereby suppressing an increase in the resistance value of the induction rings due to heat generation. , the generated vibration (exciting force) can be accurately controlled.

FIG. 1 is a schematic diagram showing the configuration of an embodiment of the induction vibration testing apparatus of the present invention. FIG. 2 is a schematic diagram showing the configuration of a modified example of the induction vibration testing apparatus of FIG. FIG. 3 is a control flow diagram showing the flow of control of the induction vibration test apparatus of FIG. FIG. 4 is a schematic diagram for explaining the configuration of another embodiment of the inductive vibration test apparatus of the present invention. FIG. 5 is a schematic diagram for explaining the configuration of another embodiment of the inductive vibration testing apparatus of the present invention. FIG. 6 is a schematic diagram for explaining the configuration of another embodiment of the inductive vibration testing apparatus of the present invention. FIG. 7 is a schematic diagram for explaining the configuration of another embodiment of the inductive vibration test apparatus of the present invention. FIG. 8 is a schematic diagram for explaining the configuration of another embodiment of the inductive vibration testing apparatus of the present invention. FIG. 9 is a schematic diagram for explaining the configuration of a conventional electrodynamic vibration testing apparatus. FIG. 10 is a schematic diagram for explaining the configuration of a conventional inductive vibration test apparatus.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments (examples) of the present invention will be described in more detail with reference to the drawings.
FIG. 1 is a schematic diagram showing the configuration of an embodiment of the induction vibration testing apparatus of the present invention.
As shown in FIG. 1, the induction vibration test apparatus 10 of the present embodiment includes a fixed portion 11 having a magnetic path member 16 and the like, a movable portion 30 on which a device under test (not shown) is mounted, and a movable portion 30 and inserted into the gap 24 of the magnetic path member 12; a cooling blower 44 which is cooling means for cooling the induction ring 36; and a control device 70 of.

The fixed portion 11 includes, for example, a magnetic path member 16 made of a magnetically permeable material such as iron, and an exciting coil 14 (magnetic flux generating means) that generates magnetic flux flowing through the magnetic path member 16 . The exciting coil 14 is applied with a DC voltage from a constant voltage source (not shown) to cause a constant magnetic flux to flow through the magnetic path member 16 , and is perpendicular to the induction ring 36 inserted in the air gap 24 of the magnetic path member 12 . is arranged to generate a magnetic field (static magnetic field) that

In this embodiment, the exciting coil 14 is provided only on the vertically lower side of the induction ring 36. However, for example, as shown in FIG. It may be provided on both sides of the lower side. With this configuration, the strength of the magnetic field (static magnetic field) perpendicular to the induction ring 36 can be increased.

Stator coils 26 and 28 are provided in the air gap 24 of the magnetic path member 12 . The stator coil 26 is a coil provided inside the gap 24 of the magnetic path member 12 , and the stator coil 28 is a coil provided outside the gap 24 of the magnetic path member 12 .

The stator coils 26 and 28 are connected via a control circuit 18 to an AC power source 19 that applies an AC voltage. An alternating current can be generated in the induction ring 36 to provide the excitation force of .

By controlling the AC voltage applied to the stator coils 26 and 28 by the control circuit 18, the vibration (exciting force) applied to the device under test can be not only made constant, but also can be made into a desired pattern. can also

The movable part 30 includes a test table 33 on which a device under test (not shown) is placed, a movable part suspension spring 34 that connects the movable part 30 and the fixed part 11 and holds the movable part 30 in a movable state, , and an induction ring 36 inserted between the gap 24 of the magnetic path member 16 , that is, between the stator coils 26 and 28 is provided at the bottom of the movable portion 30 .

As a material for forming the guide ring 36, for example, aluminum, copper, titanium, magnesium, or an alloy containing these as main components can be used, and from the viewpoint of weight reduction, it is preferable to use aluminum.

The movable portion 30 also has a shaft 39 inserted into the bearing 22 provided in the fixed portion 11 .
The movable portion 30 has its horizontal and vertical movable ranges limited to a predetermined range by the shaft 39, the bearing 22, and the spring 34 for suspending the movable portion described above.

A damper (not shown) can also be provided between the fixed part 11 and the movable part 30 . By providing the damper in this way, it is possible to prevent the movable portion 30 from being subjected to excessive excitation force and being damaged.

A through hole 20 a for cooling is provided in the bottom portion 11 a of the fixed portion 11 , and the fixed portion 11 and a cooling blower 44 are connected via a blower hose 46 . As a result, the induction ring 36, the stator coils 26, 28, etc., which have become hot due to the current flowing through the stator coils 26, 28 and the induction ring 36, can be cooled.

In this embodiment, a thermocouple 48 is provided as temperature measuring means for directly measuring the temperature of the induction ring 36 . The thermocouple 48 is connected to the controller 70 and constantly or periodically transmits the temperature of the induction ring 36 to the controller 70 , and the controller 70 determines the temperature of the cooling blower 44 based on the temperature of the induction ring 36 . It controls the output (rotation speed) of

In this embodiment, a thermocouple is used as the temperature measuring means, but the present invention is not limited to this. Non-contact temperature measurement means such as the radiation thermometer used may be used.

The controller 70 receives the temperature of the induction ring 36 measured by the thermocouple 48, which is the temperature measuring means, as described above, determines the output of the cooling blower 44 based on the temperature of the induction ring 36, and controls the temperature of the cooling blower 44. It is not particularly limited as long as it can control the output of, for example, it may be a general-purpose computer or a specially designed microcontroller.

In the induction vibration test apparatus 10 configured as described above, for example, the cooling blower 44 can be controlled by operating the control device 70 as follows.
The operation of the control device 70 will be described below based on the control flow diagram shown in FIG.

At the same time that the induction vibration tester 10 is activated, the thermocouple 48 starts measuring the temperature of the induction ring 36, and the controller 70 starts controlling the cooling blower 44 based on the measured temperature.

Before the vibration test is started (S11) by the induction type vibration test apparatus 10, the control device 70 is initialized (S10) and the control temperature of the induction ring 36 is set. The control temperature can be appropriately set depending on the scale of the induction vibration test apparatus 10, for example, but considering the resistance value of the induction ring 36 due to heat generation, it should be in the range of about 100°C to 150°C. Control is preferred.

When the vibration test is started, first, the cooling blower starts operating (S12).
Next, the temperature of the induction ring 36 is measured by the thermocouple 48, and the slope of the temperature rise is calculated by the controller 70 from the amount of temperature rise in a predetermined time (S13), and the slope of the temperature rise is greater than the predetermined value. In the case (S14), the rotation speed of the cooling blower 44 is increased (S17).

If the slope of the temperature rise is smaller than a predetermined value, the temperature of the induction ring 36 is compared with the control temperature (S15). Decrease the rotation speed (S16).

On the other hand, if the temperature of the induction ring 36 is higher than the control temperature, the rotation speed of the cooling blower 44 is increased (S17).
Next, the temperature of the induction ring 36 is compared with a predetermined temperature (hereinafter referred to as "abnormality detection temperature") higher than the preset control temperature (S18).

When the temperature of the induction ring 36 is higher than the abnormality detection temperature, the induction vibration test apparatus 10 is brought to an emergency stop (S19), and control of the cooling blower 44 is also terminated.
If the temperature of the induction ring 36 is lower than the abnormality detection temperature, then it is determined whether or not the vibration test has ended (S20). , the cooling operation by the cooling blower 44 is continued (S21 to S23) until the temperature drops below a predetermined temperature lower than the preset control temperature (hereinafter referred to as "blower stop temperature").

If the vibration test is restarted while the induction ring 36 is being cooled (S22), the flow returns to S13 and the cooling blower 44 is similarly controlled.
When the temperature of the induction ring 36 becomes lower than the blower stop temperature, the cooling blower 44 is stopped (S24). Then, a standby state is established until the vibration test is started (S11).

If it is determined in S20 that the vibration test is continuing, the process returns to S13 and control of the cooling blower 44 is continued.
In this embodiment, as described above, when the temperature of the induction ring 36 is higher than the control temperature, the rotation speed of the cooling blower 44 is increased, while the temperature of the induction ring 36 is lower than the control temperature. In this case, the rotation speed of the cooling blower 44 is controlled to decrease, but the control of the rotation speed of the cooling blower 44 is not limited to this.

For example, within the range of the control temperature, the rotation speed of the cooling blower 44 may be increased or decreased in proportion to the control temperature.
FIG. 4 is a schematic diagram for explaining the configuration of another embodiment of the inductive vibration test apparatus of the present invention.

This induction vibration test apparatus 10 basically has the same configuration as the induction vibration test apparatus 10 shown in FIGS. detailed description is omitted.

The inductive vibration testing apparatus 10 of the present embodiment does not include temperature measuring means, and is an input value measuring means for measuring the AC voltage value and/or AC current value applied to the stator coils 26 and 28 from the AC power supply 19. / A current measuring means 49 is provided.

In this embodiment, the AC voltage and/or AC current values applied to the stator coils 26, 28 measured by the voltage/current measuring means 49 are transmitted to the control device 70, and the control device 70 detects the received AC The output of the cooling blower 44 is determined based on the voltage value and/or the alternating current value (input value).

Specifically, the control device 70 stores a conversion table indicating the relationship between the applied AC voltage value and/or AC current value and the assumed temperature of the induction ring 36, and the control device 70 receives The temperature of the induction ring 36 is calculated based on the converted AC voltage value and/or AC current value based on this conversion table.

Based on the calculated temperature of the induction ring 36, the output of the cooling blower 44 can be determined by operating the controller 70 based on the control flow diagram shown in FIG.

Further, as a conversion table, a table indicating the relationship between the applied AC voltage value and/or AC current value and the assumed output of the cooling blower 44 is stored in the control device 70, and the received AC voltage value and/or Alternatively, the output of the cooling blower 44 may be determined directly from the alternating current value.

FIG. 5 is a schematic diagram for explaining the configuration of another embodiment of the inductive vibration testing apparatus of the present invention.
This induction vibration test apparatus 10 basically has the same configuration as the induction vibration test apparatus 10 shown in FIGS. A detailed description thereof is omitted.

The induction vibration test apparatus 10 of this embodiment includes a coolant spray device 50 as a cooling means.
The coolant spray device 50 has a coolant spray tank 52 , a pump 54 , a spray nozzle 56 and piping 58 .

The spray nozzle 56 is provided in the air gap 24 of the fixed part 11 so as to spray the cooling liquid to the induction ring 36 without interfering with the stator coils 26 , 28 .
Pump 54 is connected to controller 70 . By controlling the pump 54 , the controller 70 can control the amount of sprayed coolant sprayed from the spray nozzles 56 .

The amount of spray coolant sprayed from the spray nozzles 56 may be determined by the controller 70 based on the temperature of the induction ring 36 measured by the thermocouple 48, which is the temperature measuring means, or may be determined in advance. You may make it spray the fixed amount set to. Further, as in the embodiment shown in FIG. 4, a conversion table showing the relationship between the input values to the stator coils 26 and 28 and the amount of sprayed coolant is stored in the controller 70, and this conversion table is used. Alternatively, the amount of coolant to be sprayed may be determined from the inputs to the stator coils 26,28.

It is preferable to use water (pure water such as distilled water, RO water, and deionized water) as the spray cooling liquid, but it is not limited to this, and additives such as tap water are included. It may be water.

In the present embodiment, the excitation coil 14 is provided only on the vertically lower side of the induction ring 36, but it may be provided on both the vertically upper side and the lower side of the induction ring 36 as in FIG. may

Moreover, as a cooling means, the cooling blower 44 shown in FIG. 1 may be used in combination.
FIG. 6 is a schematic diagram for explaining the configuration of another embodiment of the inductive vibration testing apparatus of the present invention.

Since this induction vibration test apparatus 10 basically has the same configuration as the induction vibration test apparatus 10 shown in FIGS. Therefore, a detailed description thereof will be omitted.

The induction vibration test apparatus 10 of this embodiment includes a coolant circulation device 60 as a cooling means.
The coolant circulation device 60 has a heat exchanger 62 , a pump 64 , cooling pipes 66 and piping 68 .

In the cooling liquid circulation device 60 of this embodiment, the circulating cooling liquid cooled by the heat exchanger 62 is sent to the cooling pipe 66 via the piping 68 by the pump 64 . Cooling pipes 66 transfer heat from the induction ring 36 to the circulating coolant, which is heated to the heat exchanger 62 for cooling.

In the cooling liquid circulation device 60 , the amount of circulating cooling liquid sent to the cooling pipe 66 , that is, the cooling capacity, is controlled by a control device 70 connected to the pump 64 . For example, when the temperature of the induction ring 36 measured by the thermocouple 48, which is the temperature measuring means, is high, the flow rate of the circulating coolant is increased to increase the cooling capacity. Alternatively, the flow rate of the circulating coolant can be controlled to decrease in order to reduce the cooling capacity.

Also, as in the embodiment shown in FIG. 4, a conversion table showing the relationship between the input values to the stator coils 26 and 28 and the amount of the circulating cooling liquid to be sent is stored in the control device 70. A conversion table may be used to determine the amount of circulating coolant from the inputs to the stator coils 26,28.

A cooling pipe 66 is provided in contact with the induction ring 36 . The cooling pipe 66 is required to prevent leakage of the circulating cooling liquid flowing through the cooling pipe 66 and to increase the efficiency of heat exchange between the induction ring 36 and the circulating cooling liquid. From this point of view, the cooling pipe 66 is preferably made of a material such as copper, silver, gold, or aluminum.

Since the movable part 30 vibrates, it is preferable to connect the cooling pipe 66 and the pipe 68 with a flexible pipe such as a rubber tube or a silicon tube. Moreover, when the cooling pipe 66 and the pipe 68 are connected by a pipe having no flexibility, it is necessary to provide a mechanism that does not hinder the operation of the movable part 30 .

As the circulating coolant, water (pure water such as distilled water, RO water, and deionized water) can be used, but it is not limited to this, and additives such as tap water are included. Water may be used, or water to which a rust inhibitor or antifoaming agent has been added, or oil may be used.

In this embodiment, only the coolant circulation device 60 is used as the cooling means, but it can be used in combination with the cooling blower 44 shown in FIG. 1 and the coolant spray device 50 shown in FIG.

In this embodiment, the excitation coil 14 is provided only on the vertically lower side of the induction ring 36, but it may be provided on both the vertically upper side and the lower side of the induction ring 36 as in FIG. may

FIG. 7 is a schematic diagram for explaining the configuration of another embodiment of the inductive vibration test apparatus of the present invention.
Since this induction vibration test apparatus 10 basically has the same configuration as the induction vibration test apparatus 10 shown in FIGS. Therefore, a detailed description thereof will be omitted.

In the induction vibration test apparatus 10 of this embodiment, the induction ring 36 has a multi-layer structure.
By forming the induction ring 36 having a multi-layered structure including the induction rings 36a and 36b in this way, the effective length of the induction ring 36 (the length through which the current flows) is increased, so that a large excitation force can be obtained. On the other hand, since the amount of current flowing through one layer of the induction rings 36a and 36b is reduced, the amount of heat generated by the induction rings 36 can be suppressed.

The induction ring 36a and the induction ring 36b are electrically insulated by, for example, sandwiching a non-conductor between them. The nonconductor used in this way is not particularly limited as long as it has insulating properties and heat resistance. For example, synthetic resins such as epoxy resin, polyamide, and polyimide can be used. By using an adhesive made of such a synthetic resin as the non-conductor, the induction ring 36a and the induction ring 36b can be adhered together while ensuring insulation between the induction rings.

In this embodiment, the induction ring 36 has a two-layer structure, but the induction ring 36 may have three or more layers.
In this embodiment, the excitation coil 14 is provided only on the vertically lower side of the induction ring 36, but it may be provided on both the vertically upper side and the lower side of the induction ring 36 as in FIG. may

In this embodiment, the cooling blower 44 is provided as the cooling means. may be used in combination.

Further, in this embodiment, the thermocouple 48 is used to measure the temperature of the induction ring 36, and the controller 70 is configured to control the cooling means based on the temperature of the induction ring 36. As in the embodiment shown in FIG. 4, the input values to the stator coils 26, 28 and the cooling capacity of the cooling means (for example, the output of the cooling blower 44, the amount of spray cooling liquid, the amount of circulating cooling liquid, etc.) A conversion table indicating the relationship may be stored in the controller 70, and the cooling capacity of the cooling means may be determined from the input values to the stator coils 26, 28 using this conversion table.

FIG. 8 is a schematic diagram for explaining the configuration of another embodiment of the inductive vibration testing apparatus of the present invention.
Since this induction vibration test apparatus 10 basically has the same configuration as the induction vibration test apparatus 10 shown in FIGS. Therefore, a detailed description thereof will be omitted.

In the induction vibration test apparatus 10 of this embodiment, the cooling pipe 66 of the coolant circulation device 60 is provided between the multi-layered induction rings 36a and 36b.
By configuring in this way, the induction rings 36a and 36b can be efficiently cooled.

Note that, in this embodiment as well, between the induction ring 36a and the cooling pipe 66, and between the induction ring 36b and the cooling pipe 66, so that the induction ring 36a and the induction ring 36b are electrically insulated. is preferably sandwiched by a non-conductor.

In this embodiment, the induction ring 36 has a two-layer structure, but the induction ring 36 may have three or more layers.
In this embodiment, the excitation coil 14 is provided only on the vertically lower side of the induction ring 36, but it may be provided on both the vertically upper side and the lower side of the induction ring 36 as in FIG. may

In this embodiment, the cooling liquid circulation device 60 is provided as the cooling means. can be

Further, in this embodiment, the thermocouple 48 is used to measure the temperature of the induction ring 36, and the controller 70 is configured to control the cooling means based on the temperature of the induction ring 36. As in the embodiment shown in FIG. 4, the input values to the stator coils 26, 28 and the cooling capacity of the cooling means (for example, the output of the cooling blower 44, the amount of spray cooling liquid, the amount of circulating cooling liquid, etc.) A conversion table indicating the relationship may be stored in the controller 70, and the cooling capacity of the cooling means may be determined from the input values to the stator coils 26, 28 using this conversion table.

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to this. and the upper side, the position of the exciting coil 14 is not limited as long as it generates a magnetic field (static magnetic field) perpendicular to the induction ring 36 .

Also, in the above embodiment, the exciting coil 14 is used to generate a magnetic field (static magnetic field) orthogonal to the induction ring 36, but a permanent magnet may be used. Thus, various modifications are possible without departing from the object of the present invention.

10 Inductive vibration test device 11 Fixed part 11a Bottom part 14 Exciting coil 16 Magnetic path member 18 Control circuit 19 AC power supply 20a Through hole 22 Bearing 24 Air gap 26 Stator coil 28 Stator coil 30 Movable part 33 Test table 34 Spring for suspending the movable part 36 Induction ring 36a Induction ring 36b Induction ring 39 Shaft 44 Cooling blower 46 Blower hose 48 Thermocouple 49 Voltage/current measuring means 50 Coolant spray device 52 Coolant spray tank 54 Pump 56 Spray nozzle 58 Piping 60 Coolant circulation device 62 Heat exchange Device 64 Pump 66 Cooling pipe 68 Piping 70 Control device 100 Electrodynamic vibration test device 102 Movable part 104 Test stand 106 Movable part support spring 108 Drive coil 114 Fixed part 116 Magnetic path member 118 Exciting coil 200 Induction vibration test device 202 Movable part 204 Test stand 206 Movable part supporting spring 208 Induction ring 214 Fixed part 216 Magnetic path member 218 Exciting coil 220 Stator coil 222 Stator coil

Claims (6)

a movable part on which the device under test is mounted;
A vibration test apparatus comprising a magnetic path member having magnetic permeability and a fixed portion having magnetic flux generating means for generating magnetic flux flowing through the magnetic path member,
An induction ring that is provided at the bottom of the movable part and generates an alternating current by electromagnetic induction by applying an alternating voltage to a stator coil that is magnetically coupled in a state of being inserted into the gap of the magnetic path member. There is
A multi-layer structure in which multiple induction rings are stacked,
An induction ring comprising cooling pipes through which a cooling liquid is fed between said multi-layered induction rings. a movable part on which the device under test is mounted;
A vibration test apparatus comprising a magnetic path member having magnetic permeability and a fixed portion having magnetic flux generating means for generating magnetic flux flowing through the magnetic path member,
An induction ring that is provided at the bottom of the movable part and generates an alternating current by electromagnetic induction by applying an alternating voltage to the stator coil that is magnetically coupled in a state of being inserted into the gap of the magnetic path member. A cooling method comprising:
The induction ring is an induction ring with a multi-layer structure in which a plurality of induction rings are stacked,
A cooling method for an induction ring, characterized by providing a cooling pipe between the induction rings of the multi-layer structure, and circulating a cooling liquid through the cooling pipe. 3. The cooling method of the induction ring according to claim 2, wherein the flow rate of the cooling liquid is controlled based on the temperature of the induction ring. 3. The cooling method for an induction ring according to claim 2, wherein the flow rate of said cooling liquid is controlled based on an AC voltage value and/or an AC current value applied to said stator coil. 5. A cooling method for an induction ring according to claim 2, wherein the induction ring is sprayed with a spray cooling liquid. 6. A cooling method for an induction ring according to any one of claims 2 to 5, wherein the induction ring is cooled by a cooling blower.

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