JPH04329309A - Absolute signal generation method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a method of generating an absolute signal, and in particular to a method of generating an absolute signal at low cost by using incremental signals (using two incremental encoders or electrically obtained from one) with different resolutions, fine and coarse. This paper relates to new improvements for realizing a high-resolution absolute encoder.

0002

BACKGROUND OF THE INVENTION There are various types of absolute encoders of this type that have been used in the past, but one example is the configuration proposed by the present applicant as shown in Japanese Patent Laid-Open No. 1911-1983. be.

0003

[Problems to be Solved by the Invention] Since the conventional absolute encoder was constructed as described above, the following problems existed. In other words, the patterns formed on the rotating disks become extremely complex, and especially in the case of multi-rotation absolute encoders, encoders having two rotating disks with different patterns must be connected via a gear mechanism. It was becoming more complex both physically and electrically.

The present invention has been made to solve the above-mentioned problems, and in particular, it is possible to obtain incremental signals with different fine and coarse resolutions (using two incremental encoders or electrically obtained from one). The purpose of this invention is to provide an absolute signal generation method that can realize a high-resolution absolute encoder at low cost.

[0005]

[Means for Solving the Problems] An absolute signal generation method according to the present invention includes a coarse counter that is input after determining the direction of a coarse incremental signal, and a fine incremental signal that is a multiplication of the coarse incremental signal that determines the direction. and a fine counter that is input later, the content of the fine counter is reset by the LSB signal of the coarse counter, and the interval between each LSB signal of the coarse counter is interpolated and divided by the fine incremental signal. .

More specifically, the pulse timings of the coarse and fine incremental signals are synchronized by a correction synchronization circuit.

More specifically, the count data of the coarse counter is preset with load data whose absolute value is detected when the power is turned on.

More specifically, the coarse and fine incremental signals are obtained from incremental signals from one incremental encoder.

[0009]

[Operation] In the absolute signal generation method according to the present invention, incremental signals of two different resolutions, fine and coarse, are obtained from one or two incremental encoders and each is counted, and the LSB signal of the coarse counter is used to control the fine counter. By resetting the contents and interpolating and dividing each LSB signal of the coarse counter with a fine incremental signal, a high-resolution absolute signal can be generated at low cost.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the absolute signal generation method according to the present invention will be described in detail below with reference to the drawings.

In FIG. 1, the reference numeral 1 indicates an A-phase (sin ωθ) signal 2 and a B-phase (c
osωθ) signal 3, and each of these signals 2 and 3 is input to a correction synchronization circuit 4. The respective signals 2 and 3 obtained from the correction synchronization circuit 4 are input to a first direction determination 6 as a coarse incremental signal 5 of 12 bits (4096 C/T).

The coarse incremental signal 5 whose direction has been determined by the direction determining circuit 6 is input to a 12- to 14-bit coarse counter 7 and is counted up or down.

The Z-phase signal 8 and the absolute signal 9 of the incremental encoder 1 are the load data 10
The load signal 11 is input to the coarse counter 7 at the same time. MSB signal 7a to LSB signal 7 which is the counter data obtained from the coarse counter 7
b is input to the serial converter 12.

The correction synchronization circuit 4 is provided with a multiplier circuit 13, and the multiplier circuit 13 generates a fine incremental signal 14 (sin50×ωθ, 262144C/T
, 18 bits) are input to an 8-bit fine counter 16 via a second direction discrimination circuit 15, and are counted up or down.

The fine counter 16 is configured such that the LSB signal 7b of the coarse counter 7 is inputted to a reset terminal 16a of the fine counter 16 via a one-clock shift circuit 17, and the fine counter 16 is reset.

Count data 16 of the fine counter 16
A is input to the serial converter 12. Therefore, the coarse and fine incremental signals 5 and 14 having different resolutions are respectively counted by the coarse counter 7 and the fine counter 16, and the fine counter 16 is counted by the LS of the coarse counter 7.
It is reset by the B signal 7b. Furthermore, the interval between each LSB signal 7b of the precision counter 7 is interpolated and divided by the counter data 16A obtained by counting the precision incremental signal 14, and extremely high precision (50 times) division capability is obtained. 12 outputs a serial absolute signal 12A.

Furthermore, each of the above-mentioned incremental signals 5,
The pulse timings of No. 14 are completely synchronized by the correction synchronization circuit 4. Further, from the MSB signal 7a, which is the counter data in the rough counter 7, to the LSB signal 7
Up to b, the load data 10 (absolute value detected data) is preset by the absolute signal 9 at the same time as the power is turned on.

[0018] In the above-described embodiment, a case was described in which each of the incremental signals 5, 14 was obtained electrically from a signal from one incremental encoder, but for example, two incremental encoders may be connected in series. A similar effect can be obtained when incremental signals with different resolutions are obtained.

[0019]

[Effects of the Invention] Since the absolute signal generation method according to the present invention is configured as described above, the following effects can be obtained. In other words, since the absolute signal is obtained using two incremental signals with different resolutions, it is possible to obtain a high-resolution absolute encoder at a low cost.In particular, extremely high-precision resolution can be obtained at low speeds, and it is possible to obtain an absolute encoder using two incremental signals with different resolutions. It is possible to obtain high precision that cannot be obtained by patterning a disk.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an absolute signal generation method according to the present invention.

[Explanation of symbols] 1 Incremental encoder 4 Correction synchronization circuit 5 Coarse incremental signal 7 Coarse counter 7a MSB signal (counter data) 7b
LSB signal (counter data) 10 Load data

Claims (4)

[Claims] 1. A coarse counter (7) that is input after determining the direction of the coarse incremental signal (5), and a fine incremental signal (14) that is a multiplication of the coarse incremental signal (5) after determining the direction. a fine counter (16) to input the LS of the coarse counter (7);
The content of the fine counter (16) is reset by the B signal (7b), and each LSB of the coarse counter (7)
The fine incremental signal (1) is passed between the signals (7b) and
4) An absolute signal generation method characterized by interpolation and division. 2. The coarse and fine incremental signals (
5, 14) pulse timing is determined by the correction synchronization circuit (4)
2. The absolute signal generation method according to claim 1, wherein the absolute signal generation method is synchronized at . 3. The counter data (7a, 7b) of the rough counter (7) is preset with load data (10) whose absolute value is detected when the power is turned on. absolute signal generation method. 4. The coarse and fine incremental signals (
5, 14) is one incremental encoder (1
4. The method for generating an absolute signal according to claim 1, wherein the absolute signal is obtained from an incremental signal from a source.