JP2000308281A - High-speed rotary energy storage device, and high-speed revolution tester - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide high-speed revolution of a flywheel or an object of test large in weight. SOLUTION: A high-speed rotary energy storage device, which stores energy by the inertia of a plumb 2 by rotating the plumb 2 making use of surplus energy, is equipped with a plumb 2 which performs high-speed revolution, a rotary shaft 3 which holds the plumb 2, a frame 5 which supports this rotary shaft 3 rotatably via roller bearings 41 and 42 in the condition where it is directed vertically, and a rotation means 6 which energizes rotating action to the plumb 2, and this energy storage device further has a suction energizing means 7, which energizes the force of sucking the plumb 2 upward by magnetic force.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-speed rotary energy storage device for converting and storing kinetic energy by rotating a weight at high speed using surplus energy, or durability against high-speed rotary motion of a test object. The present invention relates to a high-speed rotation test device suitable for confirming performance.

[0002]

2. Description of the Related Art A high-speed rotary energy storage device is a device for rotating a weight by utilizing energy which is originally a surplus of energy used for another purpose, and maintaining such a rotational motion to generate a surplus energy. Is stored as rotational kinetic energy of the weight.

[0003] For example, in a power plant, a reduction in the amount of power generation is determined, and even in a time period when the amount of power consumption is small, power is supplied that exceeds the amount of power consumption. In the high-speed rotating device, the excess power energy generated in such a case is used to apply a rotating force to the weight of the high-speed rotating device only during the time period when the power consumption is small to convert it into rotational kinetic energy. The weight continues to rotate due to its inertial force even after the supply of the rotational force is interrupted, and the energy conservation state is maintained as long as the rotational operation continues.

[0004] Then, when the state of storage of energy is continued, the generator is driven by using the rotational kinetic energy as necessary, and is again converted into electric energy, which is used.

FIG. 5 shows a part of a conventional high-speed rotary energy storage device 100. The high-speed rotary energy storage device 100 includes a flywheel 101 that rotates at a high speed, a rotary shaft 102 that holds the flywheel 101, and ball bearings 103a and 103b with the rotary shaft 102 oriented vertically. A casing 104 rotatably supported through a flywheel 101;
And a motor 105 for urging the rotating operation.

The rotating shaft 102 is located near its upper end.
The ball bearing 103a is supported by the casing 104 via the ball bearing 103a, and mainly receives a load in the axial direction (the direction along the rotating shaft 102). Also,
The rotating shaft 102 is supported at its lower end by a casing 104 via a ball bearing 103b, and the ball bearing 103b mainly receives a load in a radial direction (a direction along a radius of rotation).

[0007] Reference numerals 106 a and 106 b in FIG. 5 denote bearing holding nuts, which fix the respective ball bearings 103 a and 103 b at fixed positions with respect to the rotating shaft 102.

The upper end of the rotating shaft 102 is exposed outside the casing 104, and the stored energy is taken out from the exposed portion. For example, a generator is connected to the upper end of the rotating shaft 102, and the torque of the rotating shaft 102 is used for power generation.

The motor 105 has a rotor 105a.
Are fixedly mounted on the rotating shaft 102, while the stator 105b is mounted on the casing 104 so as to surround and close to the rotor 105a.

The flywheel 101 is formed in a shape of a rotating body around a rotating shaft 102, and the rotating shaft 1
02 is fixed near the lower end of the rotating shaft 102
And the rotation operation is performed integrally.

With this configuration, in the high-speed rotary energy storage device 100, the motor 105 is driven by the surplus power energy, and a torque is applied to the flywheel 101 via the rotating shaft 102. Thereby, the rotation speed of the flywheel 101 is sufficiently increased, and the motor 1
Even after the supply of the torque in step 05 is interrupted, the rotation continues by the inertial force.

This high-speed rotary energy storage device 100
Then, in a state where the rotation of the flywheel 101 is continued, a state where the rotational kinetic energy is stored is obtained. Then, if necessary, the torque is extracted from the upper end of the rotating shaft 102, and the energy stored by power generation or the like is used.

In the high-speed rotary energy storage device 100, a turbine may be used instead of the motor 105 as a means for urging the rotation of the flywheel 101. When the turbine is used in this way, for example, the turbine is driven by compressed air output from a compressor driven by using excess power, or
It is driven using steam generated from another heat engine.

Next, a conventional high-speed rotation test apparatus will be described. A high-speed rotation test device is an industrial product (e.g., a fan) used in a normal rotation state as a test object, which is rotated at an acceleration exceeding the safe rotation speed of the test object,
This is an apparatus for testing the durability of a test object under such conditions. Further, depending on the test, the rotation speed may be increased until the test object is broken.

FIG. 6 shows a part of a conventional high-speed rotation test apparatus 200. This high-speed rotation test apparatus 200
Is a rotating shaft 202 for holding the test object S, and a ball bearing 203 with the rotating shaft 202 oriented vertically.
a, a casing 2 rotatably supported via a and 203b
And a rotation driving means 205 for urging the rotation shaft 202 to rotate at an arbitrary number of rotations.

As described above, the test object S is a rotating object whose durability against high-speed rotation is tested.

The rotating shaft 202 is located near its upper end.
The ball bearing 203a is supported by the casing 204 via a ball bearing 203a, and mainly receives a load in an axial direction (a direction along the rotating shaft 202). Also,
The rotating shaft 202 has a ball bearing 203b near its lower end.
The ball bearing 203b receives a load mainly in the radial direction (the direction along the radius of rotation).

Further, a test object S is fixedly connected to the lower end of the rotating shaft 202. A holding mechanism (not shown) is provided at a lower end portion of the rotating shaft 202. The holding mechanism includes, for example, a rotation center and a rotation shaft of the test object S having a rotating body shape by bolting, screwing, or the like. And concentrically. For this reason, the test object S is
Together with the rotation operation.

Reference numerals 206a and 206b in FIG. 6 denote bearing holding nuts, which fix the respective ball bearings 203a and 203b at fixed positions with respect to the rotating shaft 202.

The casing 204 is installed on a horizontal plane, and in such a state, supports the rotating shaft 202 along a vertical direction. Thus, the casing 204
Supports the rotating shaft 202 at the upper part thereof, while the lower part of the casing 204 is a storage part 204a for storing the test object S. This accommodation section 204a
When the test object S is crushed by the stress generated by the high-speed rotation, the fragments are prevented from scattering outside.
The periphery of the test object S is covered in a sealed state.

The rotation driving means 205 includes a driven gear 205a formed at an intermediate portion of the rotation shaft 202, a driving gear 205b engaged with the driven gear 205a, and a motor 205c for rotating and driving the driving gear 205b. have.

With this configuration, the high-speed rotation test apparatus 20
0, the motor 205c is driven by the gears 205a,
The test object S is transmitted to the rotation shaft 202 via the reference numeral 5b, and the rotation of the test object S can be urged. Then, by controlling the rotation speed of the motor 205c, the test object S is accelerated to a predetermined rotation speed, and the durability at that time is observed.

In this high-speed rotation test apparatus 200,
As in the case of the high-speed rotary energy storage device 100 described above, a turbine may be used instead of the motor 205c as a means for urging the rotation of the test object S.

[0024]

Recently, in the high-speed rotary energy storage device 100, the number of rotations is several thousand [rpm],
The total weight of the flywheel ranges from several tens to several hundreds [t], and the ball bearing 103a has a high load and a high speed rotation.
Axial load far exceeds the limit of the ball bearing 103a. It is no exaggeration to say that the limitations of ball bearings have hindered the development of power energy storage devices based on flywheels.

On the other hand, the high-speed rotation test apparatus 200
In recent years, the demand for a high-speed and high-load test object S having a ton-order weight and a rotational speed of several thousands to several tens of thousands [rpm] has been rapidly increasing.

When an excessive load on the flywheel 101 and the test object S is repeatedly applied to the ball bearings 103a and 203a, a scale called flaking F is formed on the surface of the inner and outer rings of the ball bearing as shown in FIG. Damage occurs.
When the rotation operation is further continued after the occurrence of the flaking F, the rotation state of the rotation shafts 102 and 202 deteriorates,
There is a possibility that deterioration or breakage may occur not only in each ball bearing but also in each part of the device.

In addition, in the conventional high-speed rotary energy storage device 100 and high-speed rotation test device 200, when a high load and a high-speed rotation act on each of the rotating shafts 102 and 202 simultaneously, an axial load acts. Since the load on the ball bearings 103a and 203a becomes excessively large and deteriorates rapidly and requires replacement, the frequency of the replacement has become a problem.

In particular, in flywheels intended for energy storage, frequent stoppages of equipment for replacing ball bearings significantly impair economic efficiency. Even if the frequency of replacement was reduced, the friction loss of the bearing would increase, which did not improve the economic efficiency.

Here, in the above-described high-speed rotary energy storage device 100 and high-speed rotary test device 200, the most frequently used bearings around the respective rotating shafts 102 and 202 are cylindrical roller bearings and ball bearings, but the weight is large. When rotating an object at a high speed, a ball bearing is often used for an axial load. The high-speed rotation referred to here generally refers to a ball bearing having a DNM of 600,000 or more,
The value is the pitch circle diameter Dm of the ball of the ball bearing as shown in FIG.
It is the product of [mm] and the rotation speed N [rpm].

Generally, when the DNM value of the ball bearing is reduced, high speed rotation is possible, but the load capacity with respect to the load is reduced. As the weight of the rotating body increases and the speed of rotation increases, a ball bearing capable of coping with a high rotation speed and a high load is required, but such a ball bearing does not actually exist. For ball bearings, the flywheel 101 or the test object S
If the weight of the ball bearing is on the order of tons, the permissible rotation speed of the ball bearing is about several thousand [rpm]. Therefore, a load holding technique for rotating a high-load rotating body exceeding the capacity of the bearing at a high speed has become a major issue.

As a solution to the above problem, an existing technique will be examined. First, as a countermeasure against a high load, a means of enlarging a ball bearing can be considered. In this case, it is necessary to consider a DNM value. Increasing the ball bearing means increasing the aforementioned Dm value.
In order to keep the value within the limit value, it is necessary to reduce the number of revolutions, and this problem cannot be solved.

Consider a tailing pad bearing that can be cited as an alternative to a ball bearing. FIG. 9 shows the structure of the tailing pad bearing 300. The tailing pad bearing 300 includes a rotating shaft 301 and the rotating shaft 3.
01, a disk-shaped axial load holding disk 302 provided concentrically and in a fixed state, and the axial load holding disk 3
02 is provided with a tilting pad 303 for holding the sheet No. 02 from above and below. The symbol G represents the axial load holding disk 302 and the tailing pad 30.
3 shows the lubricating oil supplied between them.

The lubricating oil G penetrates into a gap between the axial load holding disk 302 and the tilting pad 303 to form a wedge-shaped oil film to bear a thrust load. It is generally known that thrust bearings using such a wedge film are effective for high loads, but they require a high-pressure lubricating oil device, which makes the device bulky and tilting pads It itself has the disadvantage of very large friction loss and is not suitable for use in high-speed rotary energy storage devices and high-speed rotary test devices.

Next, consider a magnetic bearing as an alternative to a ball bearing. FIG. 10 shows the structure of the magnetic bearing 400. The magnetic bearing 400 includes a rotating shaft 401 and the rotating shaft 4.
01, a disk-shaped axial load holding disk 402 provided concentrically and in a fixed state, and an axial load holding disk 402
Four magnetic bearing members 403a, 403b, 403c, 403d provided in pairs on the upper surface side and the lower surface side of the motor, and four magnetic bearing members 40 provided in pairs with the rotating shaft 401 interposed therebetween.
4a, 404b, 404c, and 404d.

The magnetic bearing members 403a, 403b, 403
c and 403d receive a load in the axial direction, and the magnetic bearing members 404a, 404b, 404c and 404d receive a load in the radial direction.

In the case of a ball bearing, a ball exists in order to maintain a load acting on the shaft and obtain smooth rotation, and a cylindrical roller bearing also has a cylindrical roller for the same reason as a ball bearing. However, in the magnetic bearing 400, utilizing the characteristics of magnetism, the rotating shaft 4
01 and the axial load holding disk 402 are kept in a non-contact state.

In the radial direction, the magnetic bearing member 4
The rotary shaft 401 is formed by the magnetic bearing members 404c, 404d and the magnetic bearing members 04a, 404b while maintaining the balance by the suction force from both the left and right sides. The same applies to the axial direction. The magnetic bearing members 403a and 403b and the magnetic bearing member 4
The axial load holding disk 402 is formed as a bearing by the suction force from both the upper and lower sides with 03c and 403d.

However, in this magnetic bearing 400,
Since each magnetic bearing member is arranged with a certain gap in a non-contact manner with respect to the rotating shaft or the like, there is a disadvantage that vibration of the rotating shaft 401 is likely to occur.

However, in order to maintain high reliability so as not to damage equipment during high-speed rotation, the rotating shaft 401
The maximum allowable vibration amount is several hundred [μm] in both the axial direction and the radial direction. However, a magnetic control device for each magnetic bearing member that performs high-precision control for suppressing vibration within the limit value has not been realized, and it has been difficult for the magnetic bearing 400 to meet such a requirement.

[0040]

An object of the present invention is to provide a high-speed rotary energy storage device and a high-speed rotary test device which have a small friction loss and can be effectively durable against the weight increase of the flywheel and the test object and the high-speed rotation thereof. Its purpose is to

[0041]

According to the first aspect of the present invention, there is provided a high-speed rotary energy storage device for rotating a weight using surplus energy and storing energy by an inertial force of the weight. A rotating shaft that holds the weight, a frame that rotatably supports the rotating shaft via a rolling bearing with the rotating shaft oriented vertically.
Rotation driving means for urging the weight to rotate.

In addition, a configuration is employed in which suction urging means for urging the weight upward by magnetic force is provided.

In the above configuration, the weight is rotatably supported via the rotating shaft, and the axial load of the weight is applied to the rolling bearing at that time. In such a state, the force for sucking the weight is applied by the suction urging means, and the load on the rolling bearing is reduced.

Then, a rotational torque is applied to the weight by the rotation driving means, and the weight enters a high-speed rotation state. Thereby, the high-speed rotary energy storage device is in a state of storing the rotational kinetic energy. Then, even in such a state, only a reduced load is applied to the rolling bearing, so that the high-speed rotation state can be suitably maintained.

In addition, even if the supply of torque by the rotary driving means is cut off, the suction urging means only urges the upward suction force, which may affect the inertia force of the weight. There is no. In this way, torque is taken out from the weight that continues to rotate due to inertia via the rotating shaft, and the stored energy is used.

According to a second aspect of the present invention, the above-mentioned suction urging means is provided with a suction plate made of a magnetic material fixedly mounted on a weight or a rotating shaft, and in the vicinity of above the suction plate, and a frame body. And an electromagnet fixedly mounted on the vehicle.

In such a configuration, the electromagnet is energized and receives a force to pull the plate to be attracted upward. Since the plate to be sucked is connected to the weight via the rotating shaft, the weight is urged upward to be pulled, and the axial load on the rolling bearing is reduced.

According to a third aspect of the present invention, in addition to having the same configuration as the second aspect of the invention, the attraction urging means has a control means for adjusting the strength of the magnetic field of the electromagnet.

[0049] Therefore, the above control means makes it possible to control the strength of the magnetic field so that the axial load applied to the rolling bearing in advance corresponding to the weight of the weight is at least within the range of the allowable load of the rolling bearing. The rotation torque is applied to the weight under such a condition.

Further, in each of the above structures,
As shown in the configuration, it is desirable to set the gap between the plate to be attracted and the electromagnet to 0.5 to 2.0 [mm].

According to a fifth aspect of the present invention, in addition to the above-described configurations, a configuration is adopted in which the rotation driving means includes a motor generator. Here, the motor generator includes an input / output shaft, receives power, generates torque from the input / output shaft, and generates power by inputting torque from the input / output shaft.

In such a configuration, in addition to the above-described operations, power is supplied to the motor generator when the torque is applied to the weight. In the case where the weight is already in a high-speed rotation state and is in a state of storing rotational kinetic energy,
When the power supply to the motor generator is cut off or the supply amount is reduced, conversely, the torque due to the inertial force of the weight is input to the input / output shaft, and the motor generator enters a power generation state and is stored. The rotated kinetic energy is output as electric energy.

According to a sixth aspect of the present invention, in a high-speed rotation test apparatus for testing durability against high-speed rotation, a rotating shaft for holding a test object and a rolling bearing with the rotating shaft oriented vertically. And a rotation driving means for urging the rotation shaft to rotate at an arbitrary number of rotations.

The frame has a housing portion for housing the test object held on the rotating shaft, and has a suction urging means for urging the force for sucking the test object upward by magnetic force. Has been adopted.

Here, the test means, for example, that the number of revolutions is increased until the test object breaks, and that the limit number of revolutions is observed, or the test object is tested under a constant high-speed number of revolutions. It is to observe whether or not it has durability.

In the above configuration, first, the test object is mounted on the lower end of the rotating shaft, and at least the lower end of the rotating shaft and the test object are housed in the housing of the frame. As a result, the test object is rotatably supported via the rotary shaft, and a load in the axial direction by the test object at that time is applied to the rolling bearing. In such a state,
The suction urging means applies a suction force to the test object,
The load on the rolling bearing is reduced.

Then, a rotation torque serving as a test target value is applied to the rotation axis by the rotation driving means.
A high-speed rotation state is set together with the test object. Then, even in such a state, only a reduced load is applied to the rolling bearing, so that the high-speed rotation state can be suitably maintained.

According to the seventh aspect of the present invention, the above-mentioned suction urging means is a suction plate made of a magnetic material fixedly mounted on the rotating shaft, and located near and above the suction plate and fixed to the frame. And a mounted electromagnet.

In such a configuration, the electromagnet is energized and receives a force to pull the plate to be attracted upward. Since the plate to be sucked is connected to the test object via the rotating shaft, the test object is energized by the suction force, and the axial load on the rolling bearing is reduced.

According to an eighth aspect of the present invention, there is provided a configuration similar to that of the seventh aspect of the present invention, and the attraction urging means has a control means for adjusting the strength of the magnetic field of the electromagnet.

Accordingly, the control means makes it possible to control the magnetic field so that the axial load applied to the rolling bearing in advance in accordance with the weight of the test object is at least within the allowable load range of the rolling bearing. The rotational torque is applied to the test object under such conditions.

In each of the configurations described in claims 6, 7 and 8, the gap between the plate to be attracted and the electromagnet is set to 0.5 to 2.0 [ mm].

[0063]

(First Embodiment) A first embodiment of the present invention.
1 is shown in FIG. In the first embodiment, a high-speed rotary energy storage device 10 that rotationally drives a flywheel 2 as a weight using surplus energy and stores energy by the inertial force of the flywheel 2 is shown.

This high-speed rotary energy storage device 10
Is a flywheel 2 that rotates at a high speed, a rotating shaft 3 that holds the flywheel 2, and a ball bearing 41 as a rolling bearing with the rotating shaft 3 oriented vertically.
A casing 5 as a frame body rotatably supported via 42, a motor generator 6 as a rotation driving means for urging the flywheel 2 to rotate, and a force for attracting the flywheel 2 upward by magnetic force. And a suction urging means 7 for urging.

Hereinafter, each part will be described.

First, in a state where the casing 5 is set on a horizontal plane, the casing 5
Are supported so as to face in the vertical direction. Further, the rotating shaft 3 is provided with ball bearings 41 and 42 at a position slightly above the intermediate portion and a lower end portion, respectively, and is rotatable by being held by the casing 5 via these.

The ball bearing 41 located above receives a load mainly in the axial direction (the direction along the rotating shaft 3).
The lower part 42 mainly receives a load in the radial direction (the direction along the radius of rotation). Each of the ball bearings 41 and 42 has an allowable load of 2 [t]. Reference numerals 43 and 44 in FIG. 1 denote bearing holding nuts, which fix the ball bearings 41 and 42 at fixed positions with respect to the rotating shaft 3. In addition, since the ball bearing 42 receives only a load in the radial direction, a roller bearing may be used.

The flywheel 2 is fixedly provided near the lower end of the rotating shaft 3. This flywheel 2
Since it is formed in the shape of a rotating body around the rotating shaft 3 and is fixed to the rotating shaft 3, the rotating operation is performed integrally with the rotating shaft 3. In the high-speed rotary energy storage device 10, the weight of the flywheel 2 is set so that the total weight of the rotary shaft 3 and each component fixedly mounted thereto is 7 [t].

The casing 5 is provided therein with a partition wall 51 (shown by a two-dot line in FIG. 1) for isolating the flywheel 2 fixedly mounted on the rotating shaft 3 in a sealed state. The rotating shaft 3 penetrates the partition 51, and between the rotating shaft 3 and the partition 51, a hermetic seal (not shown) for maintaining airtightness and lubrication used at an upper portion of the rotating shaft 3 are provided. An oil seal (not shown) is provided to prevent oil from entering the flywheel 2 side. Reference numeral 21 in FIG. 1 denotes a flywheel holding nut, which fixes the flywheel 2 at a fixed position with respect to the rotating shaft 3.

Further, an area on the flywheel 2 side sealed by the partition wall 51 inside the casing 5 is communicated with a vacuum pump (not shown).
During the rotation of, a vacuum is created in such a region. Thus, the flywheel 2 is not affected by the air resistance even in the high-speed rotation state, and the rotation state due to the inertial force can be favorably maintained.

The rotary shaft 3 is engaged with the motor generator 6 above the flywheel 2 and below the ball bearing 41. The motor generator 6 has a rotor 61 fixedly provided at an intermediate portion of the rotating shaft 3 and a stator 62 fixedly mounted on the casing 5 side. The stator 62 is mounted on the casing 5 so as to surround and close to the rotor 61. The motor generator 6 receives the supply of electric power and generates torque from the rotor 61, and conversely generates electric power by inputting torque from the rotor 61.

At a position near the upper end of the rotating shaft 3, a suction urging means 7 is arranged. The suction urging means 7 is provided to reduce the axial load on the ball bearing 41 received from the rotating shaft 3.

The suction urging means 7 is a magnetically attracted plate 71 which is fixedly mounted on the upper end of the rotating shaft 3, and is located near and above the plate 71, and is fixedly mounted on the casing 5. And a coil 72 as an electromagnet.
And control means 73 for adjusting the strength of the second magnetic field.

The above-mentioned suction target plate 71 is a disk made of a magnetic material, and is fixedly mounted on the rotating shaft 3 in a state where it passes through the center. Reference numeral 711 in FIG. 1 is a suction plate fixing nut for fixing the suction plate 71 at a fixed position on the rotating shaft 3.

The coil 72 generates a self-inductance when energized, and attracts the plate 71 to be attracted. The coil 72 is fixedly mounted on the lower surface of the lid member 52 forming a part of the casing 5 in a position where the center line thereof is on the same line as the rotating shaft 3 and in a state of being close to the plate 71 to be sucked.
The distance between the coil 72 and the plate 71 to be attracted is 0.5 to
It is set to about 2.0 [mm] (in FIG. 1, they are shown at a wider interval than actual in order to show that they are not in contact with each other).

The control means 73 includes a DC power supply 731 for supplying a current to the coil 72 and a display panel (not shown) on which an output of a load cell 55 described later is displayed.
An operation panel 732 for setting and inputting the output current of the power supply 31 and a power supply control circuit 733 for outputting a current from the DC power supply 731 in accordance with an input value from the operation panel 732 are provided.

The operation panel 732 includes a load cell 55.
A constant load adding function for controlling the power supply control circuit 733 so that the output of the power supply becomes constant may be provided.

The casing 5 has a casing main body 53 having an opening at an upper portion for accommodating most of the other components located at a position lower than the plate 72 to be sucked, and the above-mentioned lid member 52 for closing the opening of the casing main body 53. A spacer 54 and a load cell 55 as load detecting means are interposed between the lid member 52 and the casing main body 53. Reference numeral 56 in FIG. 1 denotes a set screw for fixing the spacer 54 and the load cell 55 to the lid member 52.

The load cell 55 is a sensor for detecting an attractive force between the plate 71 to be sucked and the coil 72.
That is, when the coil 72 is energized and the plate 71 to be sucked is sucked, a load is applied to the load cell 55 via the lid member 53 and the spacer 54.
Outputs a detection signal to the control means 73 in accordance with the load applied at that time. The load cell 55 includes the coil 7
Another stress sensor that can detect an attractive force between the suction plate 2 and the plate 71 to be sucked may be used.

FIG. 2 shows the characteristics of the coil 72 measured based on the output of the load cell 55 described above. As a premise of the description of FIG. 2, the total weight of the rotating shaft 3, the plate 71 to be sucked, the rotor 61 of the motor generator 6, and the flywheel 2 is set to 7 [t]. As described above, the load based on the total weight is almost added to the ball bearing 41. However, since the allowable load of the ball bearing 41 is 2 [t], the coil 72 of the suction urging means 7 is , The plate 71 to be sucked must be sucked with an attractive force of at least 5 [t] or more.

In the control means 73, when the digital value input from the operation panel 732 is increased, the power supply control circuit 733 increases the current value supplied from the DC power supply 731 to the coil 72. FIG. 2A shows that the input digital value is gradually increased, the attraction force of the coil 72 which is gradually increased by this is detected by the load cell 55, and the output thereof and the change of the attraction force are shown. I have. 2B, on the contrary, the input digital value is gradually reduced, the attraction force of the coil 72, which is gradually reduced by this, is detected by the load cell 55, and the output and the output thereof are detected. 6 shows a change in suction force based on the suction force. The digital value is shown at the leftmost of each figure, the current value inputted to the coil 72 is shown next to the digital value, the suction force detected based on the output of the load cell 55 is shown next to the digital value, and the load cell is shown at the rightmost side. 55 shows the output.

FIG. 2 shows that the current value is controlled by the digital value set by the load cell 55, thereby controlling the suction force, and furthermore, there is a correlation between the suction force and the corresponding feedback value to the load cell 5. .

As described above, it is necessary for the coil 72 to bear a load corresponding to 5 [t] by its attractive force. As shown in FIG. 2, by setting the digital value input from the operation panel 732 to 1,800, the
The suction target plate 71 can be sucked with a suction force of 5,104 [kgf] corresponding to tons. Therefore, the load acting on the ball bearing 41 can be set to 2 [t] within the allowable load.

The operation of the high-speed rotary energy storage device 10 having the above-described configuration will be described below.

First, the digital value is set to 1,800 by the operation panel 732 as described above. As a result, the coil 72 sucks the plate to be sucked 71 with a force corresponding to approximately 5 [t], and the axial load of the ball bearing 41 supporting the rotating shaft 3 is 2 [t] or less within the allowable load. Become. In such a state, the motor generator 6 is driven by electric power supplied from the outside, and torque is urged to the flywheel 2 via the rotating shaft 3, so that the flywheel 2 enters a high-speed rotation state.

Thus, the high-speed rotary energy storage device 10 is in a state in which the rotational kinetic energy is stored.
Even in such a state, only a reduced load is applied to the ball bearings 41 from the original, so that the high-speed rotation state can be suitably maintained.

When the amount of electric power supplied to the motor generator 6 is reduced or cut off, the flywheel 2 is conversely rotated by the inertia force based on its weight.
, The motor generator 6 is supplied with torque, whereby the motor generator 6 outputs electric power to the outside.
Thus, the flywheel 2 that keeps rotating due to inertia
, The torque is extracted via the rotating shaft 3 and the stored energy is used.

As described above, in the high-speed rotary energy storage device 10, the suction target plate 71 is sucked by the coil 72 of the suction urging means 7 to reduce the axial load applied to the ball bearing 41. In the case where the flywheel 2 having an excessive weight is equipped, for example, even under a high-load high-speed rotation condition with a DNM value of 600,000 or more, seizure due to energy loss in the ball bearings and heat generation of the ball bearings. And the like can be effectively avoided, and it is possible to select a ball bearing 41 suitable for high-speed rotation where the allowable load is generally small. Therefore, the flywheel 2 having a large weight can be rotated at a high speed, and the high-speed rotary energy storage device 10 having a large energy storage amount can be provided. Further, since the durability of the ball bearings 41 can be maintained for a long period of time by reducing the load in the axial direction, the frequency of stopping the device for replacing the ball bearings can be reduced, and the ball bearings can be maintained for a long time. Energy can be saved and energy loss due to exchange can be reduced. At the same time, the complexity of replacing the ball bearings can be eliminated.

In addition, since the ball bearing 41 enables the high-speed rotation of the heavy flywheel 2, the flywheel 2 and the rotating shaft 3 are lower in the axial direction and the radial direction even at the time of high-speed rotation. The rotation state can be maintained by the amount of vibration. Therefore, it is possible to effectively improve the inconvenience of causing each part to deteriorate at the time of high-speed rotation,
It is possible to maintain high reliability of the device.

Since the suction urging means 7 has the coil 72 and the plate 71 to be sucked, the coil
, The suction force can be applied to the entire rotating shaft 3.

Further, since the suction urging means 7 has the control means 73, the suction force on the plate 71 to be sucked can be freely adjusted, and the weight of the flywheel 2 can be arbitrarily set. Becomes

By setting the gap between the plate 71 to be sucked and the coil 72 to 0.5 to 2.0 [mm], the coil 7
2, the suction force on the plate 71 to be sucked is stabilized, and the axial load on the ball bearing 41 can be constantly and stably reduced, so that the reliability of the device can be further improved.

Further, since the rotation driving means is the motor generator 6, it is possible to output the stored rotational kinetic energy as electric energy. Also,
It is not necessary to provide an independent means for taking out the stored rotational kinetic energy from the rotating shaft 3, so that it is possible to improve the productivity by reducing the number of parts of the apparatus and to reduce the size of the entire apparatus.

In the first embodiment, the case where the total weight of the rotating shaft 3 including the flywheel 2 is 7 [t] has been described as an example. However, the present invention is not limited to this case.
As a matter of course, the weight may exceed 7 [t].
In this case, a current corresponding to the weight of the flywheel is supplied to the coil. In the above-described high-speed rotary energy storage device 10, a motor generator is used as the rotation driving means, but the present invention is not particularly limited to this. For example, a normal motor or an air turbine may be used. When these are used, it is desirable to expose one end of the rotating shaft 3 to the outside of the casing 5 or to provide a transmission mechanism and to use the energy stored by extracting torque from the rotating shaft 3.

(Second Embodiment) FIG. 3 shows a second embodiment of the present invention. In the second embodiment, an industrial product (for example, a fan) used in a normal rotation state is used as a test object S and rotated at an acceleration exceeding the safe rotation speed of the test object S. The high-speed rotation test device 10A for testing the durability of the object S is shown. Further, depending on the test, the rotation speed may be increased until the test object is broken.

The high-speed rotation test apparatus 10A includes a rotating shaft 3A for holding the test object S, and a ball bearing 4 as a rolling bearing with the rotating shaft 3A oriented vertically.
A casing 5A as a frame rotatably supported via 1A and 42A, a rotation driving means 6A for urging the rotating shaft 3A to rotate, and a magnetic force for attracting the test object S upward. Suction urging means 7A.

Hereinafter, each unit will be described.

First, the test object S is a rotating object whose durability against high-speed rotation is tested. In the high-speed rotation test apparatus 10A, the test object S is an object of several [t]. Specifically, it is assumed here that the weight is about 7 [t]. When the casing 5 is installed on a horizontal plane, the rotating shaft 3A
Is supported so as to face in the vertical direction. The rotating shaft 3A is provided with ball bearings 41A and 42A at a position slightly above the intermediate portion and a lower end, respectively, and is rotatable by being held by the casing 5A via these.

The ball bearing 41A located above receives a load mainly in the axial direction (direction along the rotating shaft 3A). The lower portion 42A mainly receives a load in the radial direction (a direction along the radius of rotation). Each of these ball bearings 41A and 42A has an allowable load of 2 [t]. Reference numerals 43A and 44A in FIG. 1 denote bearing holding nuts, which fix the respective ball bearings 41A and 42A at fixed positions with respect to the rotating shaft 3A. In addition, about the ball bearing 42A, since a load is mainly received in the radial direction, a roller bearing may be used.

In the vicinity of the lower end of the rotating shaft 3A, a holding means (not shown) for the test object S is provided. The holding means fixes the test object S so as to rotate together with the rotating shaft 3A. For example, when the test object S is a rotating part such as a fan, a center provided on the fan is provided. A mechanism that is inserted through the hole and is detachable by bolting or the like is used.

The casing 5A has, as a part thereof, a storage container 57 as a separable storage section for isolating the test object S fixedly mounted on the rotating shaft 3A in a sealed state.
A (shown by a two-dot line in FIG. 3). The storage container 57A has a partition wall 51A for sealing the opened upper part.
The rotating shaft 3A penetrates through the partition 51A. Between the rotating shaft 3A and the partition 51A, an airtight seal (not shown) for maintaining airtightness, and a rotating shaft 3A are provided. An oil seal (not shown) is provided so that lubricating oil used in the upper portion does not enter the inside of the storage container 57A.

The container 57A and the partition 51A
The one whose wall has sufficient strength is used so that fragments of the test object S crushed beyond the limit strength do not scatter outside the apparatus. Further, the storage container 57A
Is connected to a vacuum pump (not shown), and when the test object S rotates, the inside of the storage container 57A is evacuated. Thereby, the test object S is not affected by the air resistance even in the high-speed rotation state, the breakage due to the windage is prevented, and the test only for the durability against the centrifugal force due to the high-speed rotation can be performed.

The rotating shaft 3A is engaged with the rotation driving means 6A between the ball bearing 41A and the ball bearing 42A. The rotation driving means 6A includes a driven gear 61A fixedly provided at an intermediate portion of the rotation shaft 3A, a transmission gear 62A having a large number of teeth engaged with the driven gear 61A, and a transmission gear connected on the same axis as the transmission gear 62A. A bevel gear 63A, a main bevel gear 64A for urging a drive torque to the transmission bevel gear 63A,
A drive motor 6 having the main driven gear 64A on the drive shaft
5A. The drive motor 65A includes a power supply for driving the drive motor 65A, a power supply control circuit for adjusting a current value output from the power supply, and input means for controlling the power supply control circuit to set the rotation speed of the drive motor 65A. (All are not shown). The output rotation of the drive motor 65A at the time of driving is amplified through the respective gears, so that the rotation shaft 3A
, High-speed rotation is energized.

At a position near the upper end of the rotating shaft 3A, a suction urging means 7A is arranged. This suction urging means 7A
Is provided to reduce the axial load on the ball bearing 41A received from the rotating shaft 3A.

The suction urging means 7A is a plate 71A made of a magnetic material fixedly mounted on the upper end of the rotating shaft 3A.
And a coil 72A as an electromagnet, which is located near the upper side of the plate 71A to be attracted and fixedly mounted on the casing 5A.
And control means 73A for adjusting the strength of the magnetic field of the coil 72A.

The above-mentioned suction target plate 71A is a disk made of a magnetic material, and is fixedly mounted on the rotating shaft 3A while penetrating the center thereof. Reference numeral 711A in FIG. 3 denotes a suction plate fixing nut for fixing the suction target plate 71A at a fixed position on the rotating shaft 3A.

When the coil 72A is energized, it generates a self-inductance and attracts the plate 71A. The coil 72A is fixedly mounted on the lower surface of a lid member 52A forming a part of the casing 5A in a position where its center line is on the same line as the rotation shaft 3A and in a state of being close to the suctioned plate 71A. The distance between the coil 72A and the plate 71A is set to about 0.5 to 2.0 [mm] (FIG. 3).
, They are shown at wider intervals than actual to indicate that they are not touching.)

The control means 73A includes a DC power supply 731A for supplying a current to the coil 72A and a load cell 5 described later.
An operation panel 732 having a display panel (not shown) on which an output of 5A is displayed and for setting and inputting an output current of the DC power supply 731A
A and a power supply control circuit 733A for outputting a current from the DC power supply 731A in accordance with an input value from the operation panel 732A.
And

The operation panel 732A includes the operation panel 7
Based on the weight of the test object S input from the 32A, the load due to the total weight of the test object S, the rotating shaft 3A, and the suctioned plate 71A does not exceed the axial limit load of the ball bearing 41A. A constant load adding function for controlling the power supply control circuit 733A to adjust the energization amount of the coil 72A to a predetermined amount may be provided.

The casing 5A includes a casing main body 53A having an open upper portion for accommodating most of the other components located at a lower position than the suctioned plate 72A, and a casing main body 53A.
A can be separated into the above-mentioned lid member 52A for closing the opening of A, and a spacer 54A and a load cell 55A as a load detecting means are interposed between the lid member 52A and the casing body 53A. Reference numeral 56A in FIG.
It is a set screw for fixing the spacer 54A and the load cell 55A to the lid member 52A.

The load cell 55A includes a plate 71A to be sucked.
It is a sensor for detecting an attractive force between the coil and the coil 72A. That is, power is supplied to the coil 72A and the plate 71
When A is sucked, a load is applied to the load cell 55A via the lid member 53A and the spacer 54A. The load cell 55A outputs a detection signal to the control means 73A according to the load applied at that time. . The load cell 55A may be another stress sensor that can detect an attractive force between the coil 72A and the plate 71A.

FIG. 4 shows the characteristics of the coil 72A measured based on the output of the load cell 55A.
As a premise of the description of FIG.
A, the total weight of the suction target plate 71A and the test object S is approximately 7
Reach [t]. As described above, the load based on the total weight is almost added to the ball bearing 41A. However, since the allowable load of the ball bearing 41A is 2 [t], the coil 72A of the suction urging means 7A is , At least 5
The to-be-sucked plate 71A must be sucked with an attractive force of [t] or more.

In the control means 73A, the operation panel 732
When the digital value input from A is increased, the power supply control circuit 733A accordingly increases the current value supplied from the DC power supply 731A to the coil 72A. FIG. 4 (A)
Indicates that the value of the input digital value is sequentially increased, the attraction force of the coil 72A that is gradually increased by this is detected by the load cell 55A, and the output and the change of the attraction force based thereon are shown. On the other hand, FIG. 4 (B) shows, on the contrary, the digital value to be inputted is gradually reduced, the attraction force of the coil 72A which is gradually reduced by this is detected by the load cell 55A, and the output and the output thereof are detected. 6 shows a change in suction force based on the suction force. The digital value is shown at the leftmost of each figure, the current value inputted to the coil 72A is shown next to the digital value, the suction force detected based on the output of the load cell 55A is shown next to the digital value, and the load cell is shown at the rightmost side. The output of 55A is shown.

FIG. 4 shows that the current value is controlled by the digital value set by the load cell 55A, thereby controlling the attraction force, and furthermore, the attraction force is correlated with the feedback value to the load cell 55A. .

As described above, the coil 72A needs to bear a load corresponding to 5 [t] by its attraction. As shown in FIG. 4, by setting the digital value input from the operation panel 732A to 1,800, the electromagnet can suction the plate 71A with a suction force of 5,104 [kgf] corresponding to 5 tons. it can. Therefore, the ball bearing 41
The load acting on A can be set to 2 [t] within the allowable load.

Hereinafter, the operation of the high-speed rotation test apparatus 10A having the above-described configurations will be described. In the high-speed rotation test, the test object S is rotated at an acceleration exceeding the safe rotation speed, and the durability of the test object S under such conditions is tested. First, the housing container 57A of the casing 5A is removed, and the rotating shaft 3A
The test object S is attached to the holding means at the lower end of the test object. Then, the container 57A is attached to the main body 53A again, and the casing 5A itself is placed on a horizontal plane. Next, operation panel 7
32A, the digital value is set to 1,800 as described above. Thereby, the coil 72A is approximately 5 [t].
And the load in the axial direction of the ball bearing 41A that supports the rotating shaft 3A becomes 2 [t] or less within the allowable load. In this state, the drive motor 65A of the rotary drive unit 6A is driven at a predetermined rotational speed by the input unit provided therewith, and the test object S is rotated at the target rotational speed for the test. The durability of the test object S is determined based on whether or not the test object S rotates at a target rotation speed for a predetermined time and crushes. In addition, under the high-speed rotation state of the rotating shaft 3A and the test object S, only a reduced load is applied to the ball bearing 41A, so that the high-speed rotation state can be suitably maintained. After the test, if the test object S shows durability, the test object S is removed from the rotating shaft 3A after removing the storage container 57A from the main body 53A. If the durability of the test object S is not sufficient, the test object S is crushed in the storage container 57A, and the fragments of the test object S are removed from the storage container 57A removed after the test is completed.

As described above, the high-speed rotation test apparatus 10
In A, the suction target plate 71A is sucked by the coil 72A of the suction urging means 7A, and the load in the axial direction applied to the ball bearing 41A is reduced. Even under high-load high-speed rotation conditions of 600,000 or more, it is possible to effectively avoid energy loss in the ball bearings and seizure due to heat generation of the ball bearings. It is possible to select a suitable ball bearing 41A. Therefore, it is possible to provide a high-speed rotation test apparatus 10A that can perform a good test even on a heavy test object S that could not be tested under high-speed rotation conditions.

In addition, since the ball bearing 41A allows the high-speed rotation of the heavy test object S, the test object S and the rotating shaft 3A can be rotated in the axial direction and the radial direction even during the high-speed rotation. The rotating state can be maintained with a low vibration amount. Therefore, it is possible to effectively improve the inconvenience of causing deterioration of each part of the apparatus at the time of high-speed rotation, and to maintain high reliability of the apparatus. In addition, since the durability of the ball bearing 41A can be maintained for a long period of time by reducing the load in the axial direction, the life of the device can be extended. At the same time, the complexity of replacing the ball bearings can be eliminated.

The suction urging means 7A is provided with a coil 72A.
And the plate to be sucked 71A, it is possible to energize the coil 72A and to apply a suction force to the entire rotating shaft 3A as necessary.

Further, the suction urging means 7A is controlled by the control means 73.
Since A is provided, the suction force on the suction target plate 71A can be freely adjusted, and it is possible to perform tests on various test objects S having different weights.

Further, by setting the gap between the plate 71A to be sucked and the coil 72A to 0.5 to 2.0 [mm], the suction force of the coil 72A on the plate 71A to be sucked is stabilized, and The load in the axial direction can always be stably reduced, and the reliability of the device can be further improved.

In the second embodiment, the case where the weight of the test object S is about 7 [t] has been described as an example. However, the present invention is not limited to this weight. ]. In this case, a current corresponding to the weight of the test object S is supplied to the coil 72A. In the high-speed rotation test apparatus 10A, a drive motor is used as a power source of the rotation drive unit. However, another rotation drive unit that can freely set the number of rotations may be used. For example, an internal combustion engine such as an air turbine or an engine may be used.

[0123]

According to the first aspect of the present invention, since the suction urging means urges the upward force against the rotating shaft, the axial load applied to the rolling bearing that supports the rotating shaft. In the case where the weight is reduced and the weight is excessively large, for example, even under a high-load high-speed rotation condition with a DNM value of 600,000 or more, energy loss due to the rolling bearing and heat generation of the rolling bearing may occur. It is possible to effectively prevent seizure and the like, and it is possible to select a rolling bearing suitable for high-speed rotation in which the allowable load in the axial direction is generally small. Therefore, a heavy weight can be rotated at a high speed, and a high-speed rotary energy storage device having a large energy storage amount can be provided.

Further, unlike a magnetic bearing, the weight and the rotating shaft are lower in the axial direction and the radial direction even at the time of high-speed rotation, because the rolling bearing allows the heavy weight to rotate freely at high speed. The rotation state can be maintained by the amount of vibration. Therefore, it is possible to effectively improve the inconvenience of causing each part to deteriorate at the time of high-speed rotation, and to maintain high reliability of the apparatus. In addition, since the durability of the rolling bearing can be maintained for a long time by reducing the load in the axial direction, the frequency of stopping the device for replacing the rolling bearing can be reduced, and the rolling bearing can be maintained for a long time. Energy can be conserved and energy loss due to exchange can be reduced. At the same time, the complexity of replacing the rolling bearing can be eliminated.

According to the second aspect of the present invention, since the attraction urging means has the electromagnet and the plate to be attracted, the energization of the electromagnet is performed as necessary to urge the attraction force to the entire rotating shaft. It is possible to do.

According to the third aspect of the invention, since the suction urging means is provided with the control means, the suction force on the plate to be sucked can be freely adjusted, and the weight of the weight can be arbitrarily set. Becomes

According to the fourth aspect of the present invention, by setting the gap between the plate to be attracted and the electromagnet to 0.5 to 2.0 [mm], the attractive force of the electromagnet on the plate to be attracted is stabilized, and the rolling bearing is provided. , The load in the axial direction can always be reduced stably, and the reliability of the device can be further improved.

According to the fifth aspect of the present invention, since the rotary drive means is a motor generator, the stored rotary kinetic energy can be output as electric energy. In addition, there is no need to provide an independent means for extracting the stored rotational kinetic energy from the rotating shaft, so that it is possible to improve the productivity by reducing the number of parts of the apparatus and to reduce the size of the entire apparatus.

According to the sixth aspect of the present invention, the force for attracting the test object upward by the suction urging means is urged by the magnetic force, and the axial load applied to the rolling bearing is reduced. For example, even under a high-load high-speed rotation condition with a DNM value of 600,000 or more, the test object can effectively avoid energy loss in the rolling bearing and seizure due to heat generation of the rolling bearing. In addition, it has become possible to select a rolling bearing suitable for high-speed rotation where the allowable load is generally small. Therefore, it is possible to provide a high-speed rotation test apparatus that can perform a good test even on a heavy test object that cannot be tested under high-speed rotation conditions.

[0130] In addition, since the rolling bearing allows high-speed rotation of a heavy test object, the vibration amount of the test object and the rotating shaft is low in the axial direction and the radial direction even at the time of high-speed rotation. And the rotating state can be maintained. Therefore, it is possible to effectively improve the inconvenience of causing deterioration of each part of the apparatus at the time of high-speed rotation, and to maintain high reliability of the apparatus. In addition, since the durability of the rolling bearing can be maintained for a long period of time by reducing the load in the axial direction, it is possible to extend the life of the device. At the same time, the complexity of replacing the rolling bearing can be eliminated.

According to the seventh aspect of the present invention, the attraction urging means has the electromagnet and the plate to be attracted.
By energizing the electromagnet, it is possible to apply an attractive force to the entire rotating shaft.

According to the eighth aspect of the invention, since the suction urging means has the control means, the suction force on the plate to be suctioned can be freely adjusted, and the test for various test objects having different weights can be performed. Can be performed.

According to the ninth aspect of the present invention, by setting the gap between the plate to be attracted and the electromagnet to 0.5 to 2.0 [mm], the attractive force of the electromagnet on the plate to be attracted is stabilized, and the rolling bearing is provided. , The load in the axial direction can always be reduced stably, and the reliability of the device can be further improved.

[Brief description of the drawings]

FIG. 1 is a partially omitted cross-sectional view of a high-speed rotary energy storage device according to a first embodiment of the present invention.

FIG. 2 is a table showing characteristics of an electromagnet using a load cell, where FIG. 2 (A) shows a change in load when energizing current is sequentially increased, and FIG. The load change at the time is shown.

FIG. 3 is a partially omitted cross-sectional view of a high-speed rotation test apparatus according to a second embodiment of the present invention.

4 is a chart showing characteristics of an electromagnet using a load cell, FIG. 4 (A) shows a change in load when the energizing current is sequentially increased, and FIG. The load change at the time is shown.

FIG. 5 is a sectional view of a conventional high-speed rotary energy storage device.

FIG. 6 is a sectional view of a conventional high-speed rotation test apparatus.

FIG. 7 is an explanatory view showing damage to a ball bearing.

FIG. 8 is an explanatory diagram showing a definition of a DNM value.

FIG. 9 is a sectional view showing a configuration of a tilting pad bearing.

FIG. 10 is a partially omitted front view showing the configuration of the magnetic bearing.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 High-speed rotation type energy storage apparatus 10A High-speed rotation test apparatus 2 Flywheel (weight) 3, 3A Rotation shaft 41, 42, 41A, 42A Ball bearing (rolling bearing) 5, 5A Casing 57A Housing (housing part) 6 Motor generator (Rotation driving means) 6A Rotation driving means 7, 7A Suction urging means 71, 71A Plate to be sucked 72, 72A Coil (electromagnet) 73, 73A Control means S Test object

Claims (9)

[Claims] 1. A high-speed rotary energy storage device for rotating a weight using surplus energy and storing energy by inertia force of the weight, wherein the weight performing high-speed rotation and the rotation holding the weight are provided. Axis and
A frame body rotatably supported via a rolling bearing in a state where the rotating shaft is oriented in a vertical direction, and rotation driving means for urging the weight to rotate, and the weight is sucked upward. A high-speed rotary energy storage device, comprising: suction attraction means for urging a force to be applied by a magnetic force. 2. The suction urging means, comprising: a suction plate made of a magnetic material fixedly mounted on the weight or the rotating shaft; and an upper position near the suction plate, and fixedly mounted on the frame. 2. The high-speed rotary energy storage device according to claim 1, wherein the high-speed rotary energy storage device is configured to include an electromagnet. 3. The high-speed rotary energy storage device according to claim 2, wherein said attraction urging means has a control means for adjusting the strength of the magnetic field of said electromagnet. 4. A gap between the plate to be attracted and the electromagnet,
The high-speed rotary energy storage device according to claim 2 or 3, wherein the energy is set to 0.5 to 2.0 [mm]. 5. A high-speed rotary energy storage device according to claim 1, wherein said rotary drive means includes a motor generator. 6. A high-speed rotation test apparatus for testing durability against high-speed rotation, comprising: a rotating shaft for holding a test object; and a rotating shaft which is rotatable via a rolling bearing with the rotating shaft oriented vertically. A housing for supporting the frame, and a rotation driving unit for urging the rotation shaft to rotate at an arbitrary number of rotations, wherein the frame houses the test object held by the rotation shaft; A high-speed rotation test apparatus, comprising: suction attraction means for biasing the test object upward by a magnetic force. 7. The suction urging means includes a suction plate made of a magnetic material fixedly mounted on the rotating shaft, and an electromagnet positioned above and near the suction plate and fixed to the frame. 7. The high-speed rotation test apparatus according to claim 6, wherein the apparatus comprises: 8. The high-speed rotation test apparatus according to claim 7, wherein the attraction urging means has a control means for adjusting the strength of the magnetic field of the electromagnet. 9. A gap between the plate to be attracted and the electromagnet,
9. The high-speed rotation test device according to claim 7, wherein the speed is set to 0.5 to 2.0 [mm].