JP2004211754A - Rotating device having failure detecting device of housing rotor, program for detecting failure and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To detect the failure of the cover rotation in a rotating device covered by a casing. <P>SOLUTION: A control part 200 of the failure detecting device stores a value of torque acting on a motor 400 at predetermined rotating frequency in a state that the rotor is free from the cover rotor in RAM of the control part 200. In the rotation of the cover rotor, a CPU of the control part 200 receives the value of torque acting on the motor 400 at predetermined rotating frequency from an inverter 300, compares and operates the both values, determines the failure when the difference between both values is over a predetermined value, and stops the motor. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to detection of a failure of a rotating body in a rotating device in which a rotating body such as a flywheel that rotates in a fluid such as gas or liquid is covered with a rotating body provided rotatably coaxially with the rotating body. More specifically, the present invention relates to a device for detecting a failure of a rotating body, a failure detection program for executing a failure detection process, and a recording medium on which the program is recorded.
[0002]
[Prior art]
As means for reducing the fluid resistance of a rotating body (rotor) in a rotating device, removal of fluid in contact with the surface of the rotating body or reduction of the density has been performed. For this reason, a casing for accommodating the rotating body is provided, and the loss is reduced by evacuating or reducing the pressure inside the casing.
However, in a vacuum, outgassing occurs from the rotating body itself due to evaporation of lubricating oil for lubricating the bearings supporting the rotating body and problems in manufacturing the rotating body, and the degree of vacuum is reduced, so that it is difficult to maintain the degree of vacuum. Therefore, in order to maintain a predetermined degree of vacuum, it is necessary to provide a vacuum pump or a getter as a vacuum holding device, but the vacuum holding device requires equipment cost.
[0003]
Therefore, the present applicants have previously set up a rotatably supported rotating body so as to rotate a high peripheral speed rotating body at an atmospheric pressure or an environment close to the atmospheric pressure without forming a vacuum or reduced pressure state. The same rotating shaft center is rotatably supported outside the rotating body, and a plurality of covered rotating bodies that cover the rotating body are provided concentrically, thereby reducing the relative speed between the rotating body and the covered rotating body. Then, a rotating device in which the fluid resistance is reduced and the windage is reduced has been proposed (Japanese Patent Application No. 2000-298471).
However, in this rotating device, since the rotating body rotates constantly with the rotation of the rotating body, centrifugal force always acts on the rotating body, thereby deforming and breaking the rotating body, or causing the rotating body to rotate. It was found that a failure such as distortion occurred in the mounting portion of the body bearing.
[0004]
When a failure occurs, the rotating rotor cannot rotate at the normal rotation speed, and the torque acting on the motor of each rotating rotor cannot be uniform, and the torque balance of the rotating rotor is lost. In addition to increasing the energy consumption due to the rotation, if the operation is continued as it is, in an extreme case, the rotating body and the device itself may be damaged.
However, in the rotating device, the outside of the rotating body is covered with a casing, and when a plurality of rotating bodies are arranged concentrically with the rotating body, one of the rotating bodies is temporarily provided. Even if one breaks down, there is a problem that it is not known from the outside whether or not the rotating body has failed. Therefore, there is no way to stop the overturning body even if it fails.
It should be noted that there is no conventional rotating device that detects a failure of the rotating body.
[0005]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to detect a state of a failure when a rotating body provided with a rotating body has a failure (breakage). It is to be.
[0006]
[Means for Solving the Problems]
The invention according to claim 1 includes a rotating body rotatably supported, and a covering rotating body in the form of a covering rotating body that covers the outside of the rotating body, and the covering rotating body has the same rotation axis as the rotating body. And a rotatable support for holding the fluid layer by a gap provided by selecting the inner diameter and the axial length of the cover rotating body larger than the outer diameter and the axial length of the rotating body. A function of rotating the fluid layer present in the gap with the rotation of the rotating body, acting on the overlying rotating body to cause a rotating operation, and rotating at a speed smaller than the rotating speed of the rotating body. A rotating device having a loss reducing device for reducing the loss of the rotating body by an intervening fluid layer that sequentially reduces the speed between the rotating body and the rotating body and between the rotating body and the outside; The rotation of the rotating body at a predetermined rotation speed, Means for detecting a value of a first load acting on a motor of the rotating body, and means for storing a value of a second load acting on the motor of the rotating body when the rotating body having no overlying rotating body is rotated Means for judging the presence or absence of a failure of the overturned rotary body based on the values of the first and second loads.
According to a second aspect of the present invention, in the rotating device according to the first aspect, the means for determining the presence or absence of a failure based on the first and second load values includes: A rotating device having a device for detecting a failure of an inverted rotating body, comprising: means for calculating the difference; and means for determining that the inverted rotating body has failed when the difference between the load values exceeds a predetermined value. .
According to a third aspect of the present invention, in the rotating device having the apparatus for detecting a failure of a reverse rotating body according to any one of the first and second aspects, the value of the load is a torque value acting on a motor that rotates the rotating body or the torque value. A rotating device having a failure detection device for an over-rotating body, which is a power value of a motor.
According to a fourth aspect of the present invention, there is provided a rotating body rotatably supported, and a covered rotating body in the form of a covered rotating body that covers the outside of the rotating body, and the covered rotating body has the same rotation axis as the rotating body. And a rotatable support for holding the fluid layer by a gap provided by selecting the inner diameter and the axial length of the cover rotating body larger than the outer diameter and the axial length of the rotating body. A function of rotating the fluid layer present in the gap with the rotation of the rotating body, acting on the overlying rotating body to cause a rotating operation, and rotating at a speed smaller than the rotating speed of the rotating body. The rotating body and the rotating body, and the interposed fluid layer that sequentially reduces the speed between the rotating body and the outside, the rotating body having a loss reducing device that reduces the loss of the rotating body, A failure detection program for detecting a failure, A step of detecting a value of a first load acting on a motor of the rotating body during rotation of the rotating body having a desired number of rotating bodies at a predetermined rotation speed; A procedure for storing the value of the second load acting on the motor of the rotating body in the rotation of the body in the storage means, a procedure for calculating a difference between the first and second loads, and a procedure for calculating the difference between the loads. This is a failure detection program for causing a computer to execute a procedure for determining that a reverse rotating body has failed when the value exceeds a predetermined value.
According to a fifth aspect of the present invention, in the failure detection program according to the fourth aspect,
Further, the computer includes a procedure for detecting a failure of the bearing when the overlying rotating body rotates at a predetermined speed, and a procedure for determining whether or not the overlying rotating body has a failure based on the presence or absence of the failure of the bearing and the failure of the rotating body. Is a program for detecting a failure.
[0007]
With the configuration described above, according to the present invention, when a failure occurs in the overturned rotating body during rotation of the rotating device, a computer such as a PC (Personal Computer) of the control unit executes a processing procedure based on the failure detection program. Failure can be easily detected.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described with reference to the drawings.
First, a description will be given of a rotating device provided with a reverse rotating body for reducing windage to which the present invention is applied.
FIG. 1 is a partially cutaway perspective view of a rotating device provided with a plurality of rotating bodies to which the present invention is applied. Reference numeral 101 denotes a flywheel which is a kind of a rotating body having a shaft 112 and storing energy by rotation. Reference numeral 102 denotes a first cover rotating body which is formed of a thin plate of metal or the like, covers the flywheel 101, has the same rotation axis as the flywheel, and is rotatably supported. Reference numeral 103 denotes a second cover rotor which is also formed of a thin plate, covers the first cover rotor 102, and is similarly rotatably disposed coaxially with the flywheel 101.
[0009]
Further outside the second rotating body 103, the flywheel 101, the first rotating body 102, and the second rotating body 103 are covered, and bearings 11 and 12 of the flywheel 101 are provided. A casing (container) 111 is provided. The casing 111 is fixed to a support (not shown).
13, 14 and 15, 16 are a pair of bearings, respectively, 13 and 14 are provided between the first rotating body 102 and the second rotating body 103, and 15, 16 are second bearings. It is provided between the rotating body 103 and the casing 111.
[0010]
FIG. 2 is a partially broken perspective view of another rotating device to which the present invention is applied. The first rotating body 102 and the second rotating body 103 are attached in the same manner as in FIG. 1, but openings 201 and 202 are provided on the peripheral surface thereof. The openings 201 and 202 penetrate and allow gas to move between them.
A gas pipe 113 is attached to the casing 111 that covers them, and a gas having a smaller mass than air, such as hydrogen or helium, can be injected from the gas pipe 113. Since the openings 201 and 202 are provided in the first rotating body 102 and the second rotating body 103 when injected, hydrogen is injected from these openings when hydrogen is injected, and the entire apparatus is hydrogenated with hydrogen. Can be replaced. In addition, the speed of the rotating body is increased to increase the gas pressure on the outer periphery, the pressure at the center decreases, and the overlying rotating body near the center deforms inward, and conversely, the pressure increases near the outer periphery and deforms outward. However, by providing the openings 201 and 202, the pressure fluctuation can be reduced, and the phenomenon that the reverse rotating body is crushed can be avoided.
[0011]
3 to 6 are views schematically showing the structure of still another rotating device to which the present invention is applied. In these figures, 11 and 12 are bearings for supporting the shaft 112 of the flywheel 101, 13 and 14 are bearings for supporting the first overturned body 102, and 15 and 16 are bearings for the second overturned body 103. It is a bearing to support.
[0012]
FIG. 3 shows a state where the bearings 11 and 12 of the shaft 112 of the flywheel 101 are supported by the support 17. The first rotating body 102 is rotatably supported by bearings 13 and 14. The second rotating body 103 is supported by bearings 15 and 16 supported by a support base 17. Here, the bearings 13 and 14 are provided between the first cover rotor 102 and the adjacent second cover rotor 103.
[0013]
FIG. 4 is the same as FIG. 3 with respect to the bearings 11 and 12 of the flywheel, except that one bearing 14 for supporting the first rotating body 102 is mounted between the shafts 112 of the flywheel 101. The state is shown.
[0014]
FIG. 5 shows a state in which the two bearings 13 and 14 of the first reverse rotating body 102 are attached to the shaft 112 of the flywheel 101. FIG. 6 shows a state in which the entire apparatus is arranged in the horizontal direction, and one bearing 14 of the first reverse rotating body is provided between the first rotating body and the flywheel 101.
[0015]
As described above, the bearing means 13 to 16 are provided between the flywheel 101 and the overlying rotating body 102 adjacent thereto or between the overlying rotating bodies 102 and 103, so that the bearing means is directly provided on the support base. Bearing loss is greatly reduced. Further, since the bearing means is provided between the adjacent rotating members, the relative speed is reduced, and the bearing loss is also reduced.
[0016]
Next, the principle of reducing the windage loss of the rotating device will be described.
Fluid resistance D per unit area in a rotating body having a high peripheral speed, such as a flywheel, is expressed as follows: ρ is the density of the fluid, A is a coefficient determined by Reynolds number, kinematic viscosity coefficient, and the like, and V is the speed of the rotating body.
D = (ρ / 2) AV²
Is known.
Here, since A is a coefficient, it can be seen that the fluid resistance is proportional to the square of the velocity. Therefore, it is understood that the resistance received by the entire rotating body is proportional to the square of the angular velocity of the rotating body. The torque received by the rotating body due to the fluid resistance is Q, the density of the fluid is ρ, the torque coefficient B, and the angular velocity of the rotating body is ω. Then the torque Q is
Q = (ρ / 2) Bω²
Is represented by
Here, this principle is applied to the present rotation device. First, the case where there is one inverted rotating body will be described. The surface area of the flywheel 101 is substantially equal to that of the rotating body, and the angular velocity ω of the flywheel 101₁And the angular velocity ω of the rotating body₂Are rotating in balance, the torque due to the fluid resistance between the flywheel 101 and the overturning body 102 is Q₁, The torque due to the fluid resistance between the rotating body 102 and the fluid outside the rotating body 102 is represented by Q₂Then, Q₁, Q₂Is
Q₁= (Ρ / 2) B (ω₁−ω₂)²
Q₂= (Ρ / 2) Bω2²
And the two are rotating in balance, so that the torque Q₁And Q₂Are equal, so Q₁= Q₂Holds, and the above Q₁And Q₂The following relationship is derived from the equation:
(Ρ / 2) B (ω₁-Ω2)²= (Ρ / 2) Bω2²
Rearranging this equation, ω₂= (Ω₁) / 2 are obtained. This is the angular velocity ω of the rotating body 102₂Is the angular velocity ω of the flywheel 101₁Indicates that the motor rotates at half the speed.
[0017]
Next, let us consider a case where there are an arbitrary number of inverted rotating bodies. When the number of the rotors is n, the torque of each rotor is Q₁, Q₂, Q₃, ..., Q_n-1, Q_nThen, all of them have the same value, and the respective overlying rotating bodies are rotating in a balanced manner. Therefore, each of the relative angular velocities (angular velocity difference between adjacent overlying rotating bodies) is ω₁/ (N + 1). Furthermore, since the number of fluid layers in contact with the flywheel and the overturning body is (n + 1) layers, the torque due to fluid resistance when exposing and rotating the flywheel 101 is Q₀Then, the torque Q due to the fluid resistance when n number of the rotating bodies are provided_nIs
Q_n= Q₀/ (N + 1)²
Becomes
Therefore, the resistance received by the flywheel 101 decreases as 1/4, 1/9, 1/16,.
As described above, it is understood that when a large number of the rotating rotors 102 are provided on the flywheel 101, the fluid resistance of the flywheel decreases, and so-called windage loss can be reduced. Actually, if a large number of the rotating rotors 102 are provided, the entire fluid layer or the like in contact with the flywheel 101 rotates at a large angular velocity, so that the influence of the mass of the fluid cannot be ignored.
[0018]
FIG. 7 is a graph showing a relationship between the peripheral speed V of the flywheel or the rotating body and the pressure P due to the centrifugal force due to the rotation of the fluid, and P is obtained by the equation shown in the figure. In this equation, V is the peripheral speed, R is the gas constant, T is the absolute temperature, and P is the atmospheric pressure.₀Indicated by When the peripheral speed of the flywheel or the rotating body becomes extremely high, the influence of centrifugal force due to the rotation of the fluid sandwiched between them becomes not negligible, and the pressure on the outer peripheral portion of the flywheel or the rotating body increases. It is desired to increase the sealing property of the near part. Particularly, in the case of a compressible fluid such as a gas, the density of the fluid increases as approaching the outer periphery of the rotating body.
[0019]
As is clear from the graph of FIG. 7, in the case of air, when the peripheral speed of the flywheel is increased, the pressure rapidly rises to 4.42 atm at 500 m / s and 382.2 atm at 1000 m / s. On the other hand, the calculated value of hydrogen is 5.34 atm even at 2000 m / s, and the pressure rise is extremely small as compared with air.
As described above, it is practically impossible to set the peripheral speed to 1500 m / s with air, but it is four times faster than air with hydrogen, and even at a peripheral speed of 2000 m / s, it is 1/4 the speed of air. There is not much difference from the pressure in case of Substitution with hydrogen or helium, which has a lower density than air, has much lower resistance than air and can reduce windage loss. In particular, since hydrogen has a high thermal conductivity, replacing it with hydrogen makes it possible to use parts that generate heat that cannot be used in the prior art.
[0020]
FIG. 8 is a graph showing the calculated peripheral velocities of the flywheel and the overturned rotary body when the internal pressure rise due to the centrifugal force caused by the rotation of the fluid is not taken into account and when the internal pressure is taken into account. When the internal pressure rise is considered for the first rotating body, the peripheral speed increases as compared with the case where the internal pressure rise is not considered. Similarly, the peripheral speed of the second rotating body also rises due to the rise of the internal pressure. However, since the peripheral speed is lower than that of the first rotating body, the rate of increase of the rotation speed due to the increase of the internal pressure is as follows. small.
[0021]
FIG. 9 is a diagram showing the relationship between the peripheral speed of the rotating body and the resistance torque in the case where only the flywheel has one to five overturned rotating bodies. In the case where one overlying rotating body is provided on the outer periphery of the flywheel, the relative rotation speed between the flywheel and the first overlying rotating body is reduced, so that the loss force due to windage loss of the flywheel is reduced. Is shown. Similarly, when a plurality of overturned rotating bodies are provided, the relative rotation speed between the overturned rotating body and the next overturned rotating body becomes small, so that the loss is further reduced due to this phenomenon. However, when the number of the inverted rotating bodies increases, the ratio contributing to the reduction in loss gradually decreases. In the case of increasing the number of rotating bodies, the cost of the device increases, so that it is necessary to design by comparing and judging the merits of loss reduction.
[0022]
Next, with respect to the failure detection of the overturned rotating body in the rotating device described above, first, the principle of determining the failed overturned rotating body will be described.
As described above, in the rotating body having n number of rotating bodies, the fluid resistance torque Q acting on the rotating body 101 in the saturated state rotating speed, that is, the steady rotating state._nIs the fluid resistance torque acting on the rotor when the rotating body 101 is exposed and rotated.₀Then, it is expressed by the following equation.
Q_n= Q₀/ (N + 1)²
Here, when the mechanical loss is at the time of rotation in a saturated state (at the time of constant torque) and is sufficiently smaller than the windage loss and can be regarded as approximately 0, if the fluid resistance acting on the rotating body is Q and the motor torque is T, the following equation is obtained. Holds.
T = Q
Therefore, T_n= T₀/ (N + 1)²  ... (Equation 1)
Thus, the ratio of the motor torque when the number n of the overlying rotating bodies is attached to the torque without the overlying rotating body is uniquely determined from the number of the overlying rotating bodies. Therefore, it is possible to determine the occurrence of a failure by monitoring the motor torque ratio at each saturated rotation in a rotating body having a predetermined number of rotating bodies (n), and a failure occurs in the rotating body. Sometimes it can be a trigger for system shutdown.
[0023]
Next, a flywheel to which two cover rotating bodies are mounted will be specifically described with reference to an example.
First, assuming that the motor torque value at the time of mounting the overlying rotating body at a certain rotation speed A in the saturation state is Ta 'and the motor torque value when there is no overlying rotating body is Ta, the following equation is obtained between the respective equations.
Ta '/ Ta = 1/9,
Holds.
Therefore, it is assumed that a comparison operation between the motor torque value Ta (calculated value) when there is no reverse rotating body and the motor torque value Ta 'is performed at a predetermined saturated rotation.
The actual motor torque value is periodically taken in, and the motor torque value at that time is compared with a calculated value at the time of design stored in the memory in advance.
The result of the operation,
Ta '/ Ta> 1/9
If the relationship is established, it is checked whether there is an abnormality in the motor bearing. If there is no abnormality in the motor bearing, the failure in that case is determined to be an abnormal rotation of the flywheel and the system is stopped. .
Ta '/ Ta = 1/9
Is satisfied, the relationship of Expression 1 is satisfied, and it can be determined that there is no abnormality.
[0024]
FIG. 10 is a block diagram schematically showing a failure detection device for a rotating cover.
As shown in the figure, the failure detecting device for the over-rotating body includes a control unit 200 and an inverter 300 connected to the rotating device.
[0025]
FIG. 11 is a block diagram schematically showing a configuration of control unit 200. As shown, the control unit 200 includes a CPU 210, a computer including a RAM 220 serving as a memory for storing the table, and a ROM 230 storing an operation program and the like, a communication unit 250 for communicating between the CPU 210 and the inverter 300, An A / D converter 240 for A / D converting a signal from the temperature sensor and inputting the converted signal to the CPU 210 is provided.
[0026]
The CPU 210 captures the motor torque value, which is a value (actually measured value) obtained from the inverter, via the communication unit 250, and compares this value with a calculated value or a normal value read from a table stored in the RAM 220, An abnormality in the motor torque is detected based on the difference. At the same time, the temperature information of the motor bearing portion from the temperature sensor 50 (FIG. 15) is taken in via the A / D converter, and is compared with the normal temperature of the motor bearing stored in the RAM 220 in advance. When an abnormal temperature rise is detected, processing such as determining that the bearing is abnormal is performed.
[0027]
The operation of the motor 400 is controlled by the inverter 300 according to a control signal from the control unit 200. The CPU 210 of the control unit 200 obtains a torque value acting on the motor 400 from the inverter 300, compares the torque with a torque value previously stored in a table of the RAM 220, and determines that the torque applied to the rotating body exceeds a specified value by a predetermined amount. Then, it is determined that the malfunction has occurred, and the inverter 300 is controlled to stop the rotation of the motor 400, and an alarm device (not shown) is activated to notify the occurrence of the malfunction by sound, display, or the like.
[0028]
Here, the torque value of the motor at the saturated rotation speed matches the total loss torque value. That is, the total loss torque value is the sum of the flywheel cylindrical portion windage torque, the flywheel disk portion windage torque value, and the shaft loss torque value.
FIG. 12 is a graph showing the respective torque values (theoretical values) with the ordinate representing the torque value and the abscissa representing the rotational speed when four inverted rotating bodies are used. Increases, the torque value increases in a parabolic manner.
[0029]
FIG. 13 is an actual example of a table showing motor torque values corresponding to respective rotation speeds in a case where four inverted rotating bodies are provided, in correspondence with the respective rotation speeds. This is an example of what is stored in the memory. As shown in the figure, the motor torque value is increased to 0.0062777 N. with an increase in the rotation speed of the motor (0 to 7000 rpm). m to 0.366226 N.m. m.
The value stored in the table of the memory of the control unit 200 may be a value read from the theoretical value gram, or may be measured data of the motor torque during normal rotation.
[0030]
Next, the operation of the apparatus for detecting a failure of a rotating rotor according to the present invention will be described with reference to the flowchart shown in FIG.
First, the motor 400 is inverter-controlled by an instruction from the control device 200 and starts to rotate the rotating body 101. When the rotating body 101 starts to rotate, the fluid filled between the rotating body 101 and the overlying rotating body 102 rotates with the rotation, whereby the overlying rotating body 102 also starts rotating. If there are a plurality of rotating bodies, rotation is sequentially started in this way.
[0031]
The control device 200 determines whether or not the rotations of the rotating body 101 and the inverted rotating bodies 102, 103,... Have each reached a steady state, that is, a rotation number in a saturated state. Then, the motor torque value at that rotation speed is read from the inverter 300 (S101). Next, the torque value of the table stored in the RAM 220 is read (S102), and the two are compared and calculated (S103). As a result, when the measured torque value output from the inverter 300 exceeds the calculated theoretical value by a predetermined value (for example, 5%), it is determined that there is a failure. Is determined.
The failure of the bearing of the motor is performed by detecting, by the temperature sensor 50, heat generation due to an increase in friction when the bearing of each rotating body fails. Here, a threshold value of the temperature is created based on the temperature when the rotating body is rotating normally at a predetermined speed, and this is stored in the RAM 220 in the same manner as the torque, and the temperature actually measured by the temperature sensor is calculated. When the threshold value is exceeded, it is determined that the bearing of the rotating bearing is abnormal (S105, YES), and the failure of the motor bearing is determined (S107). If no abnormality is detected in the temperature of the bearing of the motor, no abnormality is recognized in the motor bearing (S105, NO), so that the abnormality of the overturned body is determined (S106). When a failure occurs in the bearing or the rotating body, the system is stopped (S108), and the operation of the system is terminated.
[0032]
As shown in FIG. 15, the failure detection of the bearing is performed by detecting the temperature of the bearing by a temperature sensor 50 arranged opposite to each bearing portion supporting the rotating body covering the flywheel.
That is, the cover rotor 105 is rotatably supported by the bearing 19 attached to the casing 111, and the cover rotor 104 is rotatably supported by the cover rotor 105 by the bearing 17. Similarly, each rotating body 103 is rotatably supported by the rotating body 104 by a bearing 15. Similarly, each rotating body 102 is rotatably supported by the rotating body 103, and the rotating body 101 is rotatably supported by the rotating body 102 by bearings 13 and 11, respectively.
[0033]
Inside each of the bearings 13, 15, 17, and 19, a mounting bracket 111a screwed to the casing 111 of the rotating device, and another mounting bracket 111b similarly mounted to the mounting bracket 111a via a screw. The temperature sensor support 52 is provided to face the annular walls 102 a to 105 a inside the inner race of the bearings 13, 15, 17, and 19 of each overlying rotating body with the bearing temperature sensor support 52 interposed therebetween. In addition, a temperature sensor 50 is mounted near the bearing of each cover rotating body.
[0034]
The above-described process of detecting a failure of a rotating body described above is executed by the CPU 210 of the control device 200 reading out necessary data from the RAM 220 by a program stored in the ROM 230 and performing an arithmetic process or the like. Further, the program can be stored in a recording medium such as a CDROM, an MO, a DVDROM, a flexible disk, or the like, or can be easily provided to a user via a network.
[0035]
Although the embodiment of the present invention has been described above, the present invention is not limited to this. For example, when three cover rotating bodies are mounted, T_n/ T₀= 1/16 holds, but status monitoring
T_n/ T₀= 1/9 or T_n/ T₀When a ratio relationship such as = 1/4 is obtained, the former is regarded as "failure of one over-rotating body" and the latter is determined from the same ratio relationship as when two over-rotating bodies are mounted or when one over-rotating body is mounted. It is also possible to judge that "two rotating bodies have failed".
[0036]
As described above, the detection of the motor torque value may be periodically performed at an arbitrary rotational speed in a saturated state, or may be performed at a specified saturated rotational speed by designating several saturated rotational speeds.
Further, the failure of the overturned body can be similarly detected not by comparing the torque value but also by comparing the measured power value with the calculated power value. That is, the power value EP at a predetermined rotation speed in a state where the rotating body is not provided with the reverse rotating body.₀And the power value when there are n rotating bodies_nAnd the power value EP₀Is stored in the RAM 220, and the CPU 210 compares the two in the same manner as the torque value described above, and if the difference is larger than a predetermined value, it is determined that the reverse rotating body has failed.
[0037]
【The invention's effect】
Effects corresponding to the first to fifth aspects: By detecting the value of the load acting on the motor of the rotating body, it is possible to reliably detect a failure during rotation of the inverted rotating body.
[Brief description of the drawings]
FIG. 1 is a partially cutaway perspective view of a rotator device of the present invention.
FIG. 2 is a partially broken perspective view of a rotator device according to a second embodiment of the present invention.
FIG. 3 is a diagram showing a third embodiment of the present invention.
FIG. 4 is a diagram showing a fourth embodiment of the present invention.
FIG. 5 is a diagram showing a fifth embodiment of the present invention.
FIG. 6 is a diagram showing a sixth embodiment of the present invention.
FIG. 7 is a graph showing the relationship between the peripheral speed of a flywheel and the pressure according to the type of fluid.
FIG. 8 is a graph showing calculated peripheral speeds or angular velocities when the internal pressure rise due to centrifugal force is not taken into account.
FIG. 9 is a diagram showing a relationship between a peripheral speed of a rotating body and a resistance torque in a case where only a flywheel has 1 to 5 overturning rotating bodies.
FIG. 10 is a block diagram schematically showing a failure detection device for the over-rotating body.
FIG. 11 is a block diagram schematically showing a configuration of a control unit.
FIG. 12 is a graph showing the torque values (theoretical values) with the torque value plotted on the vertical axis and the rotational speed plotted on the horizontal axis when four inverted rotating bodies are used.
FIG. 13 is an example of a table showing motor torque values corresponding to each number of rotations of a rotating body.
FIG. 14 is a flowchart for the failure detection processing of the failure detection device for the overturned rotating body.
FIG. 15 is a diagram illustrating an arrangement of a temperature sensor in a bearing unit.
[Explanation of symbols]
111: casing of rotating body, 200: control unit, 210: CPU, 220: RAM, 230: ROM, 240: A / D converter, 250: communication unit, 300: inverter, 400: motor.

Claims (5)

A rotating body supported rotatably, and a covering rotating body in the form of a covering rotating body that covers the outside of the rotating body; the covering rotating body has the same rotation axis as the rotating body and is rotatably supported; The inner diameter and the length in the axial direction of the rotating body are selected to be larger than the outer diameter and the length in the axial direction of the rotating body, so that a fluid layer is maintained by a gap provided, and the rotating operation of the rotating body is performed. As a result, the fluid layer existing in the gap also rotates, and has a function of acting on the overlying rotating body to cause a rotating operation to rotate at a speed smaller than the rotating speed of the rotating body. A rotating device including a body, and a loss reducing device that reduces a loss of the rotating body by an intervening fluid layer that sequentially reduces the speed between the rotating body and the outside;
Means for detecting a value of a first load acting on a motor of the rotating body during rotation of the rotating body having an arbitrary number of rotating bodies at a predetermined rotation speed;
Means for storing a value of a second load acting on a motor of the rotating body when the rotating body having no cover rotating body is rotated,
Means for determining the presence or absence of a failure of the overturning body based on the values of the first and second loads,
A rotating device having a device for detecting a failure of a rotating body covered, characterized by comprising: The rotating device according to claim 1,
The means for determining the presence or absence of a failure based on the values of the first and second loads includes means for calculating a difference between the values of the first and second loads and a difference between the values of the loads exceeding a predetermined value. A rotating device having a device for detecting a failure of an overturned rotator, the device comprising: means for determining that the overturned rotator has failed. A rotating device having a failure detecting device for a reverse rotating body according to any one of claims 1 and 2,
The load device is a torque value acting on a motor for rotating the rotating body or a power value of the motor, wherein the rotating device has a failure detecting device for the overturned rotating body. A rotating body supported rotatably, and a covering rotating body in the form of a covering rotating body that covers the outside of the rotating body; the covering rotating body has the same rotation axis as the rotating body and is rotatably supported; The inner diameter and the length in the axial direction of the rotating body are selected to be larger than the outer diameter and the length in the axial direction of the rotating body, so that a fluid layer is maintained by a gap provided, and the rotating operation of the rotating body is performed. As a result, the fluid layer existing in the gap also rotates, and has a function of acting on the overlying rotating body to cause a rotating operation to rotate at a speed smaller than the rotating speed of the rotating body. A failure for detecting a failure of a rotating body in a rotating apparatus having a loss reducing device for reducing a loss of the rotating body by a body and an intervening fluid layer that sequentially reduces the speed between the rotating body and the outside. A detection program,
A step of detecting a value of a first load acting on a motor of the rotating body while the rotating body having an arbitrary number of rotating bodies is rotating at a predetermined rotation speed;
A procedure for storing the value of the second load acting on the motor of the rotating body at the time of rotation of the rotating body without the cover rotating body in the storage means;
Calculating the difference between the first and second load values,
A failure detection program for causing a computer to execute a procedure of determining that a reverse rotation body has failed when the difference between the load values exceeds a predetermined value. In the failure detection program according to claim 4,
Further, a procedure for detecting a failure of the bearing when the cover rotating body rotates at a predetermined speed,
A failure detection program for causing a computer to execute a procedure for determining the presence / absence of a reverse rotating body based on the presence / absence of a bearing failure and the detection of a failure of a rotating body.

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