JPS58135909A - Detecting method of rotating angle - Google Patents

Abstract

PURPOSE:To detect rotating angle with high detecting resolution even for a shaft with large diameter, by a method wherein a plurality of pulse detectors are disposed with different separation interval from pulse interval. CONSTITUTION:A rotary shaft 11 is provided with a gear 12 which is a means for generating pulses. Facing the gear 12, three pairs of photo-projectors 131 through 133 and photo-receptors 141 through 143 are disposed, which are means for detecting pulses. Thus, each photo-receptor 141, 142, or 143 detects each pitch of the gear 12, respectively, and applies a detection signal having a waveform such as A-1, B-1, and C-1. These detection signals are applied to a signal processing device 16, where pulses A-2, B-2, and C-2 are generated correspondingly to the trailing edges of the waveforms of the signals applied, respectively. These pulses are combined to obtain the waveform D.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for detecting a rotation angle of a rotating body rotating at high speed.

Conventionally, there are various types of means for detecting the rotation angle of this type of rotating body. For example, as shown in FIG. 1, a rotary encoder using an optical sensor is mounted on a rotating shaft 1, and a platen 2Yl is mounted, and a light emitter 3 and a receiver 4 are arranged facing each other with the platen 2 in between. Alternatively, as shown in FIG. 2, a gear 5 is attached to the rotating gear shaft 1, and a pulse generator using an optical sensor in which a light emitter 3 and a light receiver 4 are placed facing each other with the gear 5 sandwiched therebetween; As shown in the figure, a gear 5 is attached to a rotating shaft 1, and an electromagnetic pin is placed on this gear 5, and a quag 61 is placed close to it.
Ru.

The rotary encoder shown in Figure WN2 can have a small minimum detection angle and is excellent in both accuracy and stability, but it is difficult to connect directly to large diameter shafts such as marine diesel engines and large-scale turbines. For this reason, rotary encoders are mainly applied to small diameter shafts. In addition, the gear type shown in Figures 2 and 3 can detect the rotation angle relatively easily regardless of the diameter of the shaft, but on the other hand, the minimum detection angle cannot be made small and high accuracy cannot be achieved. There is a drawback that it is rare.

The present invention has been made in view of the above circumstances, and its purpose is to provide a rotation angle detection method that can stably detect rotation angles with high precision (resolution) even for large diameter shafts. This is what we do.

That is, the present invention comprises: a nose pulse generating means attached to a rotating object and generating a nose pulse as the rotating object rotates; A rotation angle detection device comprising a dulse detection means, detects and synthesizes pulse signals with each dulse detection means, and detects a rotation angle of a rotating object based on the combined nine notarus signals. It's a method.

The method of the present invention will be explained below with reference to illustrative examples.

First, as shown in FIGS. 4 and 5, a gear 12, which is a pulse generating means, is attached to a rotating shaft 11, which is a rotating object. Three sets of light projectors 131 to 13m and a light receiver 14, which are arm detection means, are placed at opposite positions across the gear 12.
Place 1 to 14 m. As shown in FIG. 5, the distance between the light emitter 13 and the light receiver @24 is set to 11/3 with respect to the male and tip K of the gear 12. Further, the projector 13 is connected to a projector power source 15, and the light receiver 14 is connected to a signal processing device 16.

Therefore, due to the rotation of the rotating shaft 11, each of the light receivers 141 to J4
．． detect the pitch of the gear 12, and A- in FIG.
It generates detection signals with waveforms such as 1, B-1, and C-1.

These detection signals enter the signal processing device 16, where the falling edge of each waveform corresponds to 9. By combining these parables, a waveform shown at jOD is obtained. This waveform corresponds to one rotation of a gear, a noggle of 3 gears, and the minimum angle detection value is 360'/(number of teeth x 3). This value means that the resolution has been improved three times compared to the case of one /4 lus detection means (360 γ teeth number). Therefore, general Kn
If a set of /4' pulse detection means is used and installed at p/n intervals, the resolution will be improved by n times, and if the pulse detection means and their intervals can be adjusted, it can be applied to any resolution and any gear. can be accommodated.

Next, the size of the nollus detection means is limited, and p/n
If it is not possible to install at the appropriate intervals, the intervals may be determined based on the following formula.

m・) For example, n =
3, when m=1pm=2, each pulse detection means 17 is arranged as shown in FIG. Also n = 3
When m=1*m=3, each pulse detection means 17 is arranged as shown in FIG.

Note that the nof pulse generating means according to the present invention is not limited to gears.
For example, it may be a disk with slits or a magnetic chip with waveforms recorded thereon.

As explained above, according to the present invention, if a plurality of falsity detection means are arranged at intervals different from the i4 lass interval,
In addition, it has the remarkable effect of being able to detect rotation angles with high detection resolution even for large diameter shafts.

[Brief explanation of the drawing]

FIGS. 1 to g3 are explanatory diagrams showing the conventional rotation angle detection method, and FIGS. 4 to 8 show the rotation angle detection method of the present invention,
FIG. 4 is an explanatory diagram showing an example of the arrangement of the medium pulse detection means, FIG. 5 is an enlarged view of section a in FIG. 4, and FIG. 6 is a waveform diagram showing the synthesis of detection noculus by the pulse detection means. FIG. 7 and FIG. 8 are explanatory diagrams showing other examples of arrangement states of different Norse detection means, respectively. DESCRIPTION OF SYMBOLS 11... Rotating shaft, 12... Gear, 13... Emitter, 14... Light receiver, 15... Emitter power supply, 16...
- Signal processing device, 17...no9 Luss detection means. Applicant Sub-Agent Patent Attorney Takehiko Suzue Figure 1 Figure 4 Figure 1! 5 rM j16E Figure 8 Commissioner of the Patent Office Shima 1) Haruki Tono1, Indication of Case Patent Application No. 1983-193092, Invention Name rotation angle detection method 3, relationship with the case of the person making the amendment Patent applicant (620) Mitsubishi Kata Industries Co., Ltd. 4, successor attorney 5, voluntary amendment 7, content of amendment (1) Page 5 of the specification The fourth line says “m X p +
Correct "k +p/-J" to "mxp+kxp/n".

Claims (1)

[Claims] A pulse generating means attached to a rotating object and generating a pulse as the rotating object rotates, and a plurality of pulse detecting means arranged around the means with a gap different from the /IF pulse separation. and 14 each with each/Yars detection means.
A rotation angle detection method comprising detecting and synthesizing pulse signals, and detecting a rotation angle of a rotating object based on the synthesized arm pulse signals.