JPH06100261B2 - Spindle drive generator - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a spindle drive power generation device, and in particular, removing a high-order frequency component included in a detection signal detected for controlling a constant speed control unit. The present invention relates to a spindle drive power generation device that can operate a constant speed means appropriately and improve its reliability.

[Prior Art] As shown in FIG. 7, a main shaft drive generator is driven from a main shaft 1 that is rotationally driven by a marine engine or the like to transmit its driving force to a gear train 2.
For example, a part of the driving force is taken out and given to the driven shaft 3, and the generator 4 connected to the driven shaft 3 is driven to generate electric power.

In particular, the generator 4 needs to be rotated at a constant speed in order to obtain a constant frequency. On the other hand, in a marine engine or the like, the number of revolutions is not constant and changes frequently. In between, there is provided a constant speed means 7 composed of a differential planetary gear mechanism 5 and a hydraulic circuit 6.

In the differential planetary gear mechanism 5, the differential rotation input gear 10 is meshed with the external teeth 9 formed on the outer peripheral portion of the internal gear 8. This input gear 10 accelerates and decelerates the internal gear 8 in order to increase or decrease the revolution speed of the planetary gear 11 that transmits the driving force while changing the rotation speed to make the output rotation speed of the sun gear 12 constant. It is intended to be driven forward or backward. The operation control of the input gear 10 for driving the internal gear 8 is performed by the hydraulic circuit 6. The input rotation speed of the generator 4 (the rotation speed of the driven shaft 3) detected by the rotation speed detection means (not shown) is input as a detection signal to a tilt angle servo unit (not shown) of the variable hydraulic pump 13. The servo unit controls the forward / reverse operation of the variable hydraulic pump 13 and the discharge oil amount in accordance with the input detection signal, and as a result, the hydraulic motor is differentially supplied with the supply / discharge of differential oil from the pump 13. The operation of 14 is controlled to drive the input gear 10.

[Problems to be Solved by the Invention] The tilt angle control servo unit used in the main shaft drive power generator frequently changes its rotation unlike the one used in a mechanism that requires a relatively rough control. In order to operate the generator 4 at a constant speed with respect to the main shaft 1, the hydraulic pump 13 is operated in a highly sensitive manner in response to fluctuations in the input rotation speed.

On the other hand, a marine engine or the like is generally composed of a multi-cylinder diesel engine or the like, and a torsional vibration is generated in the main shaft 1. Therefore, the generator 4 to which a part of the rotational driving force is transmitted from the main shaft 1.
The input side is also affected by the torsional vibration, and when the input rotation speed is detected, a higher-order frequency component associated with the torsional vibration is superimposed on the input rotation frequency as shown in FIG.

When a detection signal including such a high-order frequency component is input to a high-precision servo unit, the servo unit is violently operated by the high-order frequency component, its wear is significantly accelerated, and sufficient reliability cannot be ensured. There was a problem.

[Object of the Invention] The present invention was conceived in view of the problems as described above, and an object thereof is to remove a high-order frequency component included in a detection signal detected for controlling the speed-regulating means. Therefore, it is an object of the present invention to provide a spindle drive power generation device that can properly operate the constant speed means and ensure its reliability.

SUMMARY OF THE INVENTION The present invention provides a filter and a dead band device in the subsequent stage of the filter between the rotation speed detection means and the tilt angle control servo unit of the constant speed control means to which the detection signal output from the rotation speed detection means is input. It is provided so as to remove high-order frequency components included in the detection signal.

[Embodiment] A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows a schematic system diagram of a main shaft drive power generator, which includes a gear train 2 and a driven shaft 3 for driving a generator 4 by extracting a part of rotational drive force from the main shaft 1 of a marine engine 15 or the like. The structure and the structure of the constant speed means 7 for operating the generator 4 at a constant speed, which is composed of the differential planetary gear mechanism 5 and the hydraulic circuit 6, are substantially the same as those of the conventional example described above.

Here, in the present invention, the detection signal is input to the hydraulic circuit 6 of the speed-regulating means 7 into which the detection signal of the input rotation speed of the generator 4 is input, specifically, in the preceding stage of the tilt angle control servo unit 16. A control circuit 17 for processing the is provided.

As shown, the control circuit 17 includes a counter section 18, a rotation speed setting device 19, a filter 20, and a dead band device 21.
And a PID control unit 22.

The counter section 18 is connected to a rotation speed detecting means 23 which is installed on the driven shaft 3 and detects and outputs an input rotation speed, and counts the rotation speed.

On the other hand, the set rotation speed is input to the rotation speed setting device 19 as an initial value. Then, the rotational speed set by the rotational speed setting device 19 is compared with the input rotational speed actually detected and output from the counter unit 18, and the detection signal of the rotational speed difference is input to the tilt angle control servo unit 16. It is supposed to be done.

By the way, in front of this servo unit 16, a filter 20
And the dead band device 21 are sequentially provided. The filter 20 has a general structure. As shown in FIG. 2, high-order frequency components included in the detection signal at a high level equivalent to the input rotation frequency are attenuated to a low level as shown in FIG. Have the function to The dead band device 21 connected to the subsequent stage of the filter 20 is a device having a so-called dead zone, and has a function of removing all low level components as shown in FIG. Then, the processed detection signal that has passed through the filter 20 and the dead band device 21 is output to the servo unit 16 of the constant speed control means 7.
Here, the function of the PID control unit of 22 is to obtain the precision, stability, and responsiveness of the control mechanism by performing proportional amplification, integration processing, and differentiation processing on the detection signal output from the filter 20 and the dead band device 21. It is a thing.

Incidentally, 24 is a load of the generator 4.

Next, the operation will be described.

As shown in FIG. 1, the rotation speed detecting means 23 detects the input rotation speed of the driven shaft 3 which is transmitted from the main shaft 1 and drives the generator 4, and outputs it as a detection signal. The output detection signal is counted by the counter unit 18, compared with the initial value output from the rotation speed setting unit 19, and then input to the filter 20. In the preceding stage of the filter 20, the detection signal contains a high-order frequency component, and the component also has a high signal level (Fig. 2). Here, the filter 20 attenuates high-order frequency components (FIG. 3). The detection signal that has passed through the filter 20 is further input to the dead band device 21. In the preceding stage of the device 21, the detection signal has the signal level shown by the solid line in FIG. 4, and the high-order frequency component has the low level. Here, the dead band device 21 removes low level signals. Therefore, the low-order higher-order frequency components are removed, and the signal indicated by the broken line in the figure, that is, the input rotation frequency to be detected as shown in FIG. 5, is extracted without noise. The detection signal thus extracted is PI
D. It is output to the tilt angle control servo unit 16 of the constant speed control means 7 via the control unit 22. The servo unit 16 controls the operation of the hydraulic pump 13 according to the output value.

By the way, in the present invention configured as described above, it is possible to remove high-order frequency components included in the input signal input to the servo unit 16, and it is necessary for the servo unit 16 to perform a highly accurate control operation. Only the signal (input rotation frequency) can be supplied.

Therefore, the servo unit 16 can be operated accurately to suppress the wear and improve the reliability.

The filter 20 and the dead band device 21 are the counter unit 1
It may be provided in the preceding stage of 8.

[Effects of the Invention] In summary, according to the present invention, the following excellent effects are exhibited.

(1) A filter for attenuating high-order frequency components is provided in front of the tilt angle control servo unit of the constant velocity control means, and a dead band device for cutting a low level portion of the detection signal passing through the filter is provided. This makes it possible to remove the higher-order frequency components contained in the detection signal and input the necessary input rotation signal to the servo unit.

(2) Therefore, it is possible to suppress wear of the servo unit and improve reliability.

[Brief description of drawings]

FIG. 1 is a schematic system diagram showing a preferred embodiment of the present invention, and FIG.
FIG. 4 is a graph showing the detection signal level in the front stage of the filter, FIG. 3 is a graph showing the attenuation level of the detection signal in the filter, FIG. 4 is a graph showing the detection signal level in the front and rear stages of the dead band device, and FIG. FIG. 6 is a graph showing an input rotation frequency as a detection signal to be inputted to the tilt angle control servo unit, and FIG. 6 is an input rotation frequency as a detection signal containing a high-order frequency component which is conventionally inputted to the servo unit. FIG. 7 is a perspective view showing a general configuration of a spindle drive power generator. In the figure, 1 is a main shaft, 4 is a generator, 7 is a constant speed means, 15 is a marine engine exemplified as an engine, 20 is a filter, 21 is a dead band device, and 23 is a rotation speed detection means.

 ─────────────────────────────────────────────────── --Continued from the front page (56) References JP-A-56-29498 (JP, A) JP-A-53-24521 (JP, A) JP-A-56-70164 (JP, A)

Claims (1)

[Claims] 1. A generator driven by a part of a rotational driving force taken out from a main shaft of an engine, a rotation speed detecting means for detecting an input rotation speed to the generator, and an output from the rotation speed detecting means. The spindle drive power generator having a hydraulic circuit having a tilt angle control servo unit controlled by the detected signal and a constant speed increasing means for making the input rotational speed constant. A control circuit for removing the higher-order frequency component contained in the detection signal detected for controlling the speed-changing means and giving it to the speed-changing means is provided, and the control circuit is output from the rotational speed detecting means. A spindle drive power generation device comprising: a filter that attenuates a high-order frequency component from a detection signal; and a dead band device that removes a low-level portion from the detection signal that has passed through the filter.