JPH1018954A - Controllable-pitch propeller driver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a controllable-pitch propeller electric driver for varying the setting angle of controllable-pitch blades, having functions of detecting the accumulative numbers of revolutions of its motor and main rotary shaft and of continuously determining whether the differential between the numbers of revolutions obtained through comparison operation is correct or not to there by control the numbers of revolutions by correcting the same if the differential is not correct. SOLUTION: An annular slide plate 13 is provided on the outer periphery of a main rotary shaft 1 as to slide thereon, and is coupled with a blade-angle control shaft 4. A noncontact displacement gauge 15 measures the slide position of the annular slide plate 13. The differential number of revolutions calculated from the measured positional value and the differential number of revolutions obtained through the detection by an accumulative tachometer 16 are continuously compared with each other. If the slippage is larger than an allowable value, the count value of the accumulative tachometer 16 is corrected based on the value calculated from the measured positional value of the annular slide plate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving device for changing the mounting angle of a blade of a variable pitch propeller with respect to a rotating main shaft in a hydraulic machine or the like.

[0002]

2. Description of the Related Art In general, there is a water turbine, a pump, a blower, or the like in which the load can be adjusted by arbitrarily changing a mounting angle of a blade with respect to a rotating shaft.

That is, a blade holding box in which a plurality of blades are radially mounted is integrally connected to one end of a rotating main shaft,
The support shaft of each blade is rotatably held around the axis in the blade holding box. On the other hand, one end of the blade angle operation shaft which is inserted concentrically into the hollow rotary main shaft is connected to a support shaft of each blade via a link mechanism in the blade holding box.

When the load is small, the other end of the blade angle operation shaft is connected to the input shaft via a thrust bearing to transmit the blade operation force to the rotating main shaft. When the load is large, the hydraulic oil is supplied from the end of the rotary main shaft to the hydraulic cylinder provided in a part of the hollow rotary main shaft through the rotary pressure distribution valve, thereby operating the piston and the blade angle. The shafts work together to transmit the blade operating force. Therefore, in both cases, the blade angle operating shaft is moved in the axial direction, and the movement rotates each support shaft of the blade around the axis, thereby changing the mounting angle of each blade.

In recent years, Japanese Patent Application No. 58-186796 and Japanese Utility Model Application No. 1-9
As described in the specification of Japanese Patent No. 6134, the stator of the electric motor is fixed to the stationary base, and the shaft of the rotor is connected to the input shaft of the reduction gear connected to the device mounted on the rotating main shaft for converting the rotary motion into reciprocating motion. Directly connected, the blade mounting angle is changed according to the difference in the number of rotations between the rotating main shaft and the rotor of the electric motor. The operation method is changed from an operation method using hydraulic pressure to electric power, and labor saving of maintenance and rationalization of equipment are being studied.

[0006]

However, such an electric motor stator is fixed to a stationary base, and an electric motor that changes the mounting angle of the variable pitch blades according to the difference in the number of revolutions between the rotating main shaft and the rotor of the electric motor. As shown in FIG. 3, the drive unit electrically detects the cumulative number of rotations of the rotating main shaft and the rotor of the electric motor, and controls the electric motor based on the rotational speed difference value calculated and compared. If the detected value of the cumulative number of revolutions is changed to an incorrect value due to the disturbance, the motor may be controlled based on that value and continue.

If the variable pitch impeller is operated with an incorrect mounting angle as described above, the output efficiency of the impeller is remarkably reduced and operation becomes impossible, and excessive force is applied to the axial bearing of the rotating main shaft. There is also a risk of working and burning.

SUMMARY OF THE INVENTION An object of the present invention is to provide a control method for detecting whether an accumulated rotational speed is detected and comparing the calculated rotational speed to determine whether or not a rotational speed difference value is always correct. The purpose is to improve driving reliability.

[0009]

An object of the present invention is to provide a slide disk which slides on the outer peripheral surface of a rotary spindle, connect it to a blade angle operation shaft, and measure the slide position of the slide disk with a non-contact displacement meter. Measure and compare the rotational speed difference value calculated from the detected position value of the slide disk with the rotational speed difference value obtained by electrically detecting and calculating the cumulative rotational speed. If the deviation is larger than a predetermined allowable value, this is achieved by a control method for correcting the value of the cumulative tachometer with a value calculated from the detected value of the slide disk position.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 2 is a cross-sectional view of a conventional electric drive device for a variable pitch propeller, and FIG. 3 is a diagram showing a control form thereof.
And an accumulator tachometer 16a for measuring the accumulative rotation speed of the electric motor 10 for changing the mounting angle of the variable pitch blades 3 radially mounted on the blade holding box 1a at one end of the rotating spindle 1. It is measured by the tachometer 16b. Then, the difference between the measured cumulative rotational speeds is calculated by the comparison calculator 17 and output to the comparator 20 which is compared with the blade angle command value. Then, the comparator 20 compares the command value with the detected value, and compares the information with the electric motor driving device 21.
, The motor 10 is controlled at the desired speed and positioning.

However, since the cumulative rotation speed is electrically counted and detected as described above, and the motor is controlled by the rotation speed difference value calculated and compared, the count value is incorrect due to lightning discharge or other electromagnetic interference. , There is a risk that the motor will continue to be controlled based on the incorrect value.

Therefore, in the present invention, as shown in FIG. 1, a slide disk 13 that slides on the outer peripheral surface of the rotary spindle 1 is provided.
Then, the blade angle operating shaft 4 is integrated with the connecting pin 14 so that the sliding disc 13 can be rotated at any speed.
Is detected by the non-contact displacement meter 15, and the position of the blade angle operation shaft 4 is measured.

Since the blade angle operating shaft 4 is mechanically connected to the variable pitch blade 3 via the arm 4 and the link mechanism 5, the position of the blade angle operating shaft 4 is converted into a function and the variable pitch blade 3 is changed. Can be regarded as the mounting angle.

A rotational speed difference value Nb obtained by multiplying the detected value of the non-contact displacement meter 15 by a rotational speed deviation calculator 19b;
The determination unit 22 always compares the rotation detection values 11 and 12 and the rotation speed difference value Na measured by the cumulative rotation speed meter 16 and obtained by the comparator 17. If the deviation of both values |
If Nb | is larger than the predetermined allowable value ΔN, the rotation speed difference value Nb obtained from the detection value of the non-contact displacement meter 15 is input to the rotation value corrector 23,
This is a control method for correcting the values of 6a and 16b.

[0016]

According to the present invention, it is determined whether or not the difference between the rotational speeds obtained by detecting the accumulated rotational speeds of the motors for changing the mounting angle of the rotating main shaft of the impeller or the variable pitch blades and comparing them is always correct. Since the judgment method is provided and the control method corrects correctly in case of an error, the reliability of impeller operation can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram of a structure and a control mode of an electric drive device of the present invention.

FIG. 2 is a sectional view of a conventional variable pitch propeller electric drive device.

FIG. 3 is a block diagram of a control form of a variable pitch blade mounting angle according to the related art.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Rotating main shaft, 1a ... Variable pitch blade holding box, 3 ... Variable pitch blade, 4 ... Blade angle operation shaft, 6a ... Reducer input shaft,
8 ... Electric drive device motion converter, 9 ... Coupling, 10
... motor, 10a ... motor rotor shaft, 11a, 12a ...
Rotating disk, 11b, 12b ... light emitting element, 11c, 1
2c: light receiving element, 13: slide disk, 14: connecting pin, 15: non-contact displacement meter, 15a: non-contact displacement meter sensor head, 16a, 16b: cumulative speed meter, 17: comparison calculator, 18: blade Angle command signals, 19a, 19b: rotational speed deviation calculator, 20: comparator, 21: electric motor driving device,
22: Judgment device, 23: Rotation value correction device.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Junichi Nozu 3-2-2, Sachimachi, Hitachi, Ibaraki Prefecture Within Hitachi Engineering Services Co., Ltd. (72) Inventor Isao Yanagita 3-1-1, Sachimachi, Hitachi, Ibaraki No. 1 Inside Hitachi, Ltd. Hitachi Plant

Claims (2)

[Claims] 1. A stator of an electric motor is fixed to a stationary pedestal, and a shaft of the rotor is directly connected to an input shaft of a speed reducer connected to a device for converting a rotary motion into a reciprocating motion mounted on a rotary main shaft. In an electric drive device for changing an attachment angle of a variable pitch blade attached to the rotating main shaft according to a difference in rotation speed between a main shaft and a rotor of the electric motor, a sliding disk sliding on an outer peripheral surface of the rotating main shaft. And a device for detecting the mounting angle of the variable pitch blade by connecting the blade to the blade angle operating shaft and measuring the sliding position of the slide disk with a non-contact displacement meter. Variable pitch propeller drive. 2. The apparatus according to claim 1, wherein the difference between the number of revolutions of the rotating main shaft and the rotor of the electric motor is controlled to control the electric motor. A control method for constantly comparing the rotational speed difference value calculated from the detected value of the slide disk, and correcting the value of the cumulative tachometer with the calculated value from the position detected value of the slide disk if incorrect. Variable pitch propeller drive.