JP3071232B2 - Disconnection detection method of rotation detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting a disconnection in a rotation detecting device, and more particularly to a novel improvement for always and surely detecting a disconnection by using a DC voltage regardless of a rotation angle.

[0002]

2. Description of the Related Art There are various methods for detecting a disconnection of a rotation detecting apparatus of this kind which has been used in the past, and a typical one among them is described in FIG.
Can be mentioned. That is, a resolver indicated by reference numeral 1 in FIG. 2 is connected to a first detector 4 and a second detector 5 for outputting a sine wave signal 2 and a COS wave signal 3. I have.

The sine wave signal 2 and the cosine wave signal 3
Is input to a resolver / digital converter 6, which outputs a digital angle signal 6a after conversion. SIN from each of the amplifiers 4 and 5
The wave signal 2 and the COS wave signal 3 are input to a disconnection detector 7, to which a determination reference signal 9 from a reference generator 8 connected to the resolver 1 is input. Therefore, when the resolver 1 is operating normally, the SIN wave signal 2 and the CO
The S-wave signal 3 and the determination reference signal 9 were input, and the disconnection detector 7 determined that the operation was normal.

[0004]

The conventional method for detecting a disconnection of a rotation detecting device has the following problems because it is configured as described above. That is, by entering the determination reference signal and the SIN wave signal and COS wave signals to breakage detector, because a disconnection detection of the resolver using a SIN + COS .theta ≧ 1 or ^{SIN 2 θ + COS 2 θ =} 1 of the formula The judgment level is “1”, and this value is “1”.
When it was below, it was determined that the wire was broken. However, in the case of this method, since the signal may include an error, the value is set to about 0.8 to 0.95, and the determination of the disconnection is always performed only when the disconnection occurs. COS
At around 90 ° on the side (near the voltage level of 0 V), it was impossible to determine.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and more particularly, to a rotation detecting device which uses a DC voltage to always perform reliable disconnection detection regardless of the rotation angle. An object of the present invention is to provide a disconnection detection method.

[0006]

According to the present invention, there is provided a method for detecting a disconnection of a rotation detecting apparatus, comprising the steps of: converting an SIN wave signal and a COS wave signal obtained from a rotation detector through first and second detectors into an analog / digital converter; In the rotation detecting device, a capacitor is provided between each of the detectors and the analog / digital converter, and a determination reference signal from a reference generating unit connected to the rotation detector is input. A DC voltage is superimposed on a SIN wave signal line that outputs the SIN wave signal and a COS wave signal line that outputs the COS wave signal, and is provided between each detector and each capacitor. When a DC voltage signal is input to the disconnection detector via a DC signal line, it is detected that there is no disconnection in the rotation detector. The presence or absence of a disconnection at the angular position of the rotation detector is detected by inputting the SIN wave signal and the COS wave signal to the disconnection detector using a detection signal line provided between the converters and comparing the signal with the determination reference signal. Is the way.

[0007]

In the disconnection detecting method of the rotation detecting device according to the present invention, the DC voltage is superimposed on the SIN wave signal line and the COS wave signal line. Since it is input to the disconnection detector, for example, around 0 ° on the SIN side and 90 ° on the COS side
The disconnection can also be detected in the vicinity of ° (around the voltage level of 0 V). Further, when a disconnection occurs, the detection of the DC voltage is not performed, so that the disconnection can be reliably detected.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the method for detecting disconnection of a rotation detecting device according to the present invention will be described in detail with reference to the drawings. The same or equivalent parts as those in the conventional example will be described using the same reference numerals.

FIG. 1 is a block diagram showing a method for detecting a disconnection of a rotation detecting device according to the present invention. In FIG. 1, reference numeral 1 denotes a resolver serving as a rotation detector. The resolver 1 includes a sine wave signal 2 and a COS signal.
The first detector 4 and the second detector 5 for outputting the wave signal 3 include a sine wave signal line 10 and a cosine wave signal line 11
Connected through.

An extremely weak DC voltage 12 is connected to each of the signal lines 10 and 11 so that the DC voltage is superimposed on each of the signal lines 10 and 11. Each of the detectors 4 and 5 is connected via a capacitor 13 to a resolver / digital converter 6 as an analog / digital converter. The resolver / digital converter 6 outputs a digital angle signal 6a after conversion. ing. Each of the detectors 4, 5
DC signal lines 20 and 2 connected between
The DC voltage signals 20 a and 21 a obtained from 1 are applied to the disconnection detector 7.

A detection signal line 22, which is connected between each of the capacitors 13 and the resolver / digital converter 6,
SIN wave signal 2 and COS wave signal 3 obtained from 23
Is applied to the disconnection detector 7. A criterion signal 9 from a reference generator 8 connected to the resolver 1 is applied to the disconnection detector 7.

Therefore, when the resolver 1 operates normally and the signal lines are normal, the weak DC voltage 12 superimposed on the signal lines 10 and 11 is applied to the detectors 4 and 5 and the signal lines. The DC voltage value is input to the disconnection detector 7 via the terminals 20 and 21, and it is confirmed that there is no disconnection by detecting the DC voltage value.
It can also be detected near 0 ° (the output voltage is zero).

At a specific angular position of the resolver 1, a voltage of the same level as the DC voltage 12 is output from each of the DC signal lines 20, 21. In this case, the detection signal lines 22, 23 By obtaining the sine wave signal 2 and the COS wave signal 3 obtained from the above through the capacitor 13 and comparing them with the judgment reference signal 9, the presence or absence of disconnection can be detected.

In this embodiment, the case where the resolver is used as the rotation detector has been described, but a configuration such as a synchro can be used.

[0015]

The disconnection detecting method of the rotation detecting device according to the present invention is configured as described above, so that the following effects can be obtained. That is, since a weak DC voltage is superimposed on the signal line of a rotation detector such as a resolver,
The DC voltage can be detected even in the dead zone between the SIN wave signal and the COS wave signal, so that highly reliable disconnection detection can be always performed regardless of the rotation angle of the rotation detector.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a disconnection detection method of a rotation detection device according to the present invention.

FIG. 2 is a configuration diagram showing a disconnection detection method of a conventional rotation detection device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Rotation detector (resolver) 2 SIN wave signal 3 COS wave signal 6 Analog / digital converter (resolver / digital converter) 6a Digital angle signal 10 SIN wave signal line 11 COS wave signal line 12 DC voltage

Claims (1)

(57) [Claims] The first and second detectors (4, 4) are provided from a rotation detector (1).
SIN signal (2) and COS signal obtained through 5)
(3) Digital angle signal with analog / digital converter (6)
(6a) In a rotation detecting device adapted to convert to (6a), a capacitor (13) is provided between each of the detectors (4, 5) and an analog / digital converter (6) and connected to the rotation detector (1). A sine wave signal line (10) that has a disconnection detector (7) to which a determination reference signal (9) from the reference generation unit (8) is input, and outputs the sine wave signal (2); A DC voltage (12) is superimposed on a COS wave signal line (11) for outputting a COS wave signal (3), and a DC signal line (20) provided between each of the detectors (4, 5) and each of the capacitors (13). , 21), the DC voltage signal (20a, 21a) is input to the disconnection detector (7), thereby detecting that there is no disconnection in the rotation detector (1). The detection signal line (22,2) provided between the digital converters (6)
3) the SIN wave signal (2) and the COS wave signal (3) are input to the disconnection detector (7) and compared with the judgment reference signal (9) to obtain the angle of the rotation detector (1). A disconnection detection method for a rotation detecting device, wherein the presence or absence of a disconnection at a position is detected.