JP3827643B2 - Nut-driven active mass damper with hollow motor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to the technical field of motor-driven active mass dampers, and more particularly, relates to an active mass damper that directly rotates a nut with a hollow motor.
[0002]
[Prior art]
Conventionally, various structure types of motor-driven active mass dampers are known and have been put to practical use.
If you classify the active mass damper of the conventional general motor drive system,
(A) A vibration control device that rotationally drives a screw shaft with a motor, and (a1) a damping device that fixes a nut to a mass and installs the motor on the structure side to rotationally drive the screw shaft. Is disclosed. This patent document 1 also clearly describes a configuration in which a ball screw mechanism is adopted as the screw mechanism. Similarly, even if the screw shaft is rotationally driven by a motor, (a2) a vibration damping device in which a motor is installed on a mass, the screw shaft is rotationally driven, and a nut is fixed to the structure side is disclosed in Patent Document 2. Is disclosed.
(B) Conversely, Patent Documents 3 and 4 disclose a vibration damping device in which a screw shaft is fixed to a structure and a nut is rotationally driven by a motor, and both the motor and the nut are installed on the mass side. Has been.
(C) Note that, as a precaution, a vibration damping device in which a pinion and a motor that rotationally drives the pinion are installed on the side of the mass, and a rack that engages with the pinion is installed on the side of the structure is long. Is disclosed.
[0003]
[Patent Document 1]
JP-A-2-3000047 [Patent Document 2]
JP 2001-280410 A [Patent Document 3]
Japanese Patent No. 2670156 [Patent Document 4]
Japanese Patent No. 2603161 [Patent Document 5]
Japanese Patent No. 2727796 [0004]
[Problems to be solved by the invention]
In the case where the screw shaft of the above (A) is rotationally driven by a motor, since the inertia moment of the screw shaft is large, 10% to 50% of the power generated by the motor to move the mass is driven by the screw shaft. Consumed to rotate. In addition, as the amount of displacement required for the mass increases, the effective length of the screw shaft inevitably increases, and the proportion of motor power required to rotate the screw shaft increases. Is required. In addition, the problem of the buckling of the screw shaft increases, or the problem of lowering the shaft rigidity also occurs, so the diameter of the screw shaft must be greatly increased, and the screw shaft is very expensive. In other words, the power efficiency of the motor is further deteriorated. Eventually, there is a problem that the screw mechanism (ball screw mechanism) itself cannot be designed, and it is known that there is a limit to increasing the displacement of the mass. It can be seen that the invention of Patent Document 5 solves the above problem by adopting a rack and pinion mechanism.
[0005]
As shown in (B) above, a system in which the screw shaft is fixed to the structure side and the nut is driven to rotate by a motor. , (A) is not described above, and the advantage that the weight of the nut and the motor can be added to the mass is also recognized. However, since all of the prior arts disclosed in Patent Documents 3 and 4 are configured to indirectly rotate by connecting the output shaft of the motor and the nut with a transmission mechanism such as a gear train, for example, the transmission mechanism exists. It is inevitable that the structure is complicated and large. And the power efficiency of a motor falls by the part of transmission efficiency. In addition, there are some disadvantages and problems such as a slight delay in the response of the vibration control device due to the play and backlash generated in the transmission mechanism and a decrease in the vibration control effect.
[0006]
The object of the present invention is that even if the displacement (stroke) of the mass is large, the motor power efficiency is excellent, the power consumption is small, the screw shaft design is not unreasonable, and it is relatively lightweight and compact. The present invention provides a motor-driven active mass damper that can be implemented as a simple device.
[0007]
The ultimate object of the present invention is to use a hollow motor with a screw shaft passing through the center and install it on the mass, and to directly rotate and drive the nut with this hollow motor. It is to provide a mass damper.
[0008]
[Means for Solving the Problems]
As means for solving the above-mentioned problems, a nut-driven active mass damper with a hollow motor according to the invention described in claim 1 is a motor-driven active mass damper.
Both ends of the screw shaft 4 are fixed to the structure side, and linear motion rails 8 are fixed to the structure side in parallel with the screw shaft 4 on both sides, and the mass 7 is placed on the linear motion rail. It is arranged so as to be movable in the same direction as the screw shaft 4, and the hollow motor 6 is arranged on the lower surface of the mass 7 so that the screw shaft 4 passes through the hollow portion of the rotor core 6 a forming the inner cylinder. It is attached as a unit and installed as an additional weight for the mass ,
Hollow motor 6 includes a rotor 6a forming the inside of the hollow cylindrical concentrically arranged inner and outer, as a servo motor having a hollow structure, and an outer stator, and configured as a brake built-in, pre-Symbol screw shaft 4 And the nut 5 screwed together is joined to the rotor core 6a and directly rotated by the hollow motor 6,
The screw shaft 4 and the nut 5 are constituted by a ball screw mechanism that moves with low friction via the ball 10;
A vibration sensor 12 for measuring the vibration of the structure is installed on the structure, and includes a control panel 14 to which a detection signal of the vibration sensor 12 is input. The control panel 14 is generated based on the detection signal of the vibration sensor 12. The hollow motor 6 is driven and controlled by the control signal, and the mass 7 is moved to exhibit an active damping function for the structure.
[0010]
The hollow motor referred to in the present invention is, for example, a hollow motor disclosed in JP-A-6-292340, a hollow motor which is a power source of an electric actuator disclosed in JP-A-6-300106, and JP-A 2000-2000. Various well-known hollow motors used in the linear drive device disclosed in Japanese Patent No. 257604, or hollow actuators disclosed in Japanese Patent Application Laid-Open No. 2001-218422, which are arranged in concentric cylinders inside and outside. The motor is composed of a combination of a rotor and an outer stator, and the inner rotor indicates a motor configured in a hollow cylindrical shape.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention shown in the drawings will be described below.
FIGS. 1 to 3 show an embodiment of an active mass damper of a nut driving system using a hollow motor according to the inventions described in claims 1 and 2.
The vertical girders 3 and 3 are firmly fixed on the bases 2 and 2 at the four corners fixed to the building or other structure 1 that is the object of vibration control, that are opposed to each other in the vertical direction. . Then, as viewed in the direction of FIG. 1, both end portions of the screw shaft 4 having a necessary effective length are installed between the left and right vertical beams 3 and 3 and are firmly fixed to each other.
[0012]
The motor that directly rotates and drives the nut 5 screwed to the screw shaft 4 is a hollow motor 6 having a hollow structure through which the screw shaft 4 passes, and is integrally attached to the lower surface of the mass 7. Therefore, the nut 5 and the hollow motor 6 move integrally with the mass 7, and the weight is added to the mass 7.
The mass 7 includes two parallel linear motion rails 8 and 8 (linear motion guides, linear motion bearings, linear guides, linear rails) installed between the left and right vertical beams 3 and 3 in the same direction as the screw shaft 4. Etc.) are movably installed through guide shoes 9, 9 that slide on the top. Specifically, cross beams 15 and 15 assembled together with left and right vertical beams 3 and 3 are installed on the frame 2, and the linear motion rail 8 is installed on each of the horizontal beams 15 and 15. ing. The hollow motor 6 moves along the screw shaft 4 disposed at an intermediate position between the two parallel linear motion rails 8, 8. The casing of the motor 6 is directly bolted to the lower surface of the mass 7. It is firmly attached by means such as a stopper. Reference numeral 20 in the figure denotes an outer casing of the active mass damper.
[0013]
Incidentally, the screw shaft 4 and the nut 5 are constituted by a ball screw mechanism that moves with low friction via a large number of small balls 10 as shown in FIG. The flange portion 5a of the nut 5 is joined to one end portion of the rotor core 6a that forms the inner cylinder of the hollow motor 6 by a set screw 11, and rotates integrally. The screw shaft 4 passes through the hollow portion of the rotor core 6a in the axial direction. The hollow motor 6 is a so-called servo motor capable of high-precision control, and is a built-in brake type. However, since the specific configuration is not questioned, detailed illustration is omitted.
[0014]
On the other hand, a vibration sensor 12 (including an acceleration sensor, a speed sensor, a displacement sensor, etc.) for measuring the vibration of the structure 1 is directly installed on the structure 1. The detection signal measured by the vibration sensor 12 is guided as an input of the control panel 14 (FIG. 1). The control signal generated by the arithmetic processing unit of the control panel 14 based on the detection signal of the vibration sensor 12 is sent to the hollow motor 6 through the flexible wire 13 including the power line of the hollow motor 6. In short, the control panel 14 performs appropriate drive control such as the rotation direction, rotation speed, and rotation angle of the hollow motor 6 and moves the mass 7 to exhibit an active vibration suppression function for the structure 1. is there.
[0015]
In this case, since the hollow motor 6 directly drives the nut 5 to rotate, there is no problem of transmission efficiency, and it can be expected that the response accuracy is improved by the amount of play and play that are concerned about the transmission mechanism. Further, the nut 5 itself has a much smaller moment of inertia than the screw shaft 4 and is composed of a low-friction ball screw mechanism, so that the motor efficiency is excellent and the hollow motor 6 is relatively small. It has the advantages of low power output and reduced power consumption. Even if the displacement amount (amplitude stroke) required for the mass 7 becomes large, the screw shaft 4 fixed at both ends can be prevented from buckling and shaft rigidity, and can suppress an increase in diameter. Does not cause unreasonable design. Therefore, as a whole, the device is light, small and economical.
[0016]
【The invention's effect】
The active mass damper of the motor driving system according to the first and second aspects of the present invention is excellent in the power efficiency of the motor and consumes less power even if the displacement amount (stroke) of the mass is large. There is no unreasonable design of the shaft, and it can be provided as a relatively lightweight and compact device.
[0017]
Further, the active mass damper of the present invention is configured by using a hollow motor with a screw shaft penetrating the center portion installed in the mass and driving the nut directly with the hollow motor. It is possible to reduce the size by reducing the actual dimension in the vertical direction, and it is possible to design and manufacture a highly efficient damper with a relatively long stroke without difficulty.
[Brief description of the drawings]
FIG. 1 is an elevational view showing an embodiment of an active mass damper according to the present invention.
FIG. 2 is a plan view of the above.
FIG. 3 is a view taken along the line III-III in FIG. 2;
FIG. 4 is an enlarged cross-sectional view of a main part showing a structure for connecting a nut and a hollow motor.
[Explanation of symbols]
4 Screw shaft 1 Structure 5 Nut 6 Hollow motor 7 Mass 12 Vibration sensor 14 Control panel

Claims (1)

In motor-driven active mass dampers,
Both ends of the screw shaft is fixed to the structure side, the screw shaft parallel to linear rails are installed to similarly fixed to the structure side on both sides, the mass is placed on the linear rail screw shaft As the additional weight of the mass , a hollow motor is integrally attached to the lower surface of the mass so that the screw shaft passes through the hollow portion of the rotor core forming the inner cylinder. That it is installed,
The hollow motor is configured as a hollow servo motor with a hollow cylindrical rotor arranged concentrically on the inside and outside and a stator on the outside, and as a brake built-in type. A screw shaft is passed, and a nut screwed to the screw shaft is joined to a rotor core and directly rotated by the hollow motor;
The above screw shaft and nut are composed of a ball screw mechanism that moves with low friction via a ball,
A vibration sensor for measuring the vibration of the structure is installed in the structure, and includes a control panel to which a detection signal of the vibration sensor is input, and the control panel generates the control signal based on the detection signal of the vibration sensor. An active mass damper of a nut drive type using a hollow motor, wherein the hollow motor is driven and controlled to move a mass to exhibit an active vibration control function for a structure.

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