JPH01250723A - Encoder - Google Patents

Abstract

PURPOSE:To prevent the lowering of reliability with respect to signal transmission, by generating position data and origin data in an encoder to obtain serial data. CONSTITUTION:A count pulse signal CNT and a direction signal U/D are formed by two-phase pulse signals PA, PB generated from a two-phase pulse signal generation part 11 subsequent to the rotation of a motor and the count value of an incremental and decremental counter 14 becomes Q by both signals. When an origin signal PZ is generated, the count value Q is stored in an origin data latch 16 at the rising time of the signal PZ and changed to origin data QZ. The count value Q is stored in a position data latch 15 at the rising time of a strobe signal STRB to be changed to position data QP. The data QZ, QP are applied to a P/S data converter circuit 17 by the load signals LDP, LDZ from a timing control circuit 18 and converted from parallel data to serial data in synchronous relation to a serial clock SCK and, therefore, the reliability with respect to the signal transmission can be secured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an encoder, and particularly to an encoder that operates with high precision and high speed and is used as a position detection device.

[Conventional technology]

Encoders that generate pulses as the motor rotates are widely used to detect the rotational position of the motor.

Conventionally, this type of incremental encoder is
As shown in FIG. 3, there is a two-phase pulse signal generator 31 that generates two-phase pulse signals PA and PB for detecting the rotation angle amount and rotation direction of the motor, and an origin for detecting one revolution of the motor. Origin signal generation section 3 that generates signal PZ
2 and a driver 33 for transmitting each signal PA, PB, PZ, and this rotation information is directly outputted and transmitted to the outside via the driver 33.

[Problem to be solved by the invention]

However, the configuration shown in FIG. 3 is not suitable for applications requiring high precision and high speed operation, and has the following problems in terms of external transmission of rotational information.

In other words, the conventional incremental encoder described above is configured to output two-phase pulse signals PA and PB, so in order to increase the resolution of detection of the amount of rotation angle of the motor, the number of pulses per one rotation of the motor is increased. or when the motor is rotated at high speed, the two-phase pulse signal PA,
The disadvantage is that the PB frequency becomes high, making it difficult to ensure reliability in signal transmission.

An object of the present invention is to provide an encoder that does not reduce the reliability of signal transmission even when the frequency of a two-phase pulse signal becomes high, and is suitable for high-purity single-speed operation.

[Means to solve the problem]

The present invention uses a two-phase pulse signal in an encoder that detects the amount of rotation angle and rotation direction of a motor, performs direction discrimination and edge detection from the two-phase pulse signal, counts with an amplifier down counter, and synchronizes with a strobe signal. a position data generation section that uses the origin signal and temporarily stores the count value of an up/down counter in synchronization with the origin signal and generates the origin data. , a data conversion circuit for converting position data and origin data from parallel data to serial data and transmitting the serial data in synchronization with a serial clock.

〔Example〕

Next, embodiments of the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention. As shown in FIG. 1, the intelligent encoder of this embodiment includes a two-phase pulse signal generator 11 that generates two-phase pulse signals PA and PB for detecting the amount of rotation angle and rotation direction of the motor, and one Origin signal PZ for detecting rotation
In addition, even if the frequency of the two-phase pulse signals PA and PB becomes high, the two-phase pulse signals PA and PB are provided in order to prevent the reliability of signal transmission from decreasing.
, PB is not directly output, but a two-phase pulse signal PA.

It is configured to output data generated by the PB as serial data synchronized with a low frequency serial clock.

That is, in addition to the two-phase pulse signal generation section 11 and the origin signal generation section 12, two-phase pulse signals PA and PB are input,
A direction discrimination/edge detection circuit 13 that generates a direction signal U/D and a count pulse signal CNT, and a direction signal U/D.
and an up/down counter 14 that inputs and counts the count pulse signal CNT, and an amplifier down counter 14.
a position data latch 15 that temporarily stores the count value Q of the up/down counter 14 in synchronization with the strobe signal 5TRB, an origin data latch 16 that temporarily stores the count value Q of the up/down counter 14 in synchronization with the origin signal PZ, and a position data latch 1.
Input the position data Q of 5 and the origin data Q2 of the origin data latch 16 to convert the parallel data to the serial data S.
Furthermore, it inputs a strobe signal 5TRB to generate a serial clock SCK to the P/S data conversion circuit 17, and outputs position data QP and origin. a load signal LD for loading data Q2 to the P/S data conversion circuit 17;
, LD2.

Direction signal U is generated by inputting the two-phase pulse signals PA and PB mentioned above.
A direction discrimination/edge detection circuit 13 that generates /D and a count pulse signal CNT, an up/down counter 14 that inputs and counts the direction signal U/D and count pulse signal CNT, and a count value Q of the amplifier down counter 14 is externally inputted. A position data generating section is constituted by a position data latch 15 which is temporarily stored in synchronization with the input strobe signal 5TRB, and an origin data latch 16.
constitutes the origin data generation section. Serial data SD is transmitted to the outside from a P/S data conversion circuit 17 to which outputs from each of these data generation sections are supplied.

In this way, in this embodiment, in the incremental encoder that detects the rotation angle amount and rotation direction of the motor,
A position data generation section that performs direction discrimination and edge detection from the two-phase pulse signals PA and PB, counts it with an amplifier down counter 14, and temporarily stores it in synchronization with the strobe signal 5TRB to generate position data Q, and a home position signal. An origin data generation section that temporarily stores the count value Q of the up/down counter 14 in synchronization with PZ and generates origin data Q2, and converts the position data Q and origin data Q2 from parallel data to serial data SD and serializes it. P for serial data transfer in synchronization with clock SCK
/S data conversion circuit 17 is included.

The operation of this embodiment will be explained below with reference to FIG. 2 as well.

FIG. 2 is an operation timing chart of the encoder having the above configuration, and FIGS. 2(a) and 2(b) show two-phase pulse signals PA and PB generated by the two-phase pulse signal generating section 11, and FIG. 2(f) shows the origin signal PZ obtained from the origin signal generator 12.

Now, as shown in FIG. 2, when two-phase pulse signals PA and PB are generated as the motor rotates, the count pulse signal CNT and direction signal U/D (second Figure (C).

(d)) is generated, and a count pulse signal CNT is generated.

The up/down counter 14 counts in response to the direction signal U/D, and the count value becomes Q (see FIG. 2(e)). On the other hand, when the origin signal PZ is generated, the count value Q is temporarily stored in the origin data latch 16 at the rising edge of the origin signal PZ, and the value is changed to the previous value QZ(y+-1) as shown in FIG. 2(g). ) to the current value QZ(II). In addition, the strobe signal 5T shown in FIG. 2(h)
At the rising edge of RB, the count value Q is temporarily stored in the position data latch 15, and the value changes from the previous value QP(a-1) to the current value Q, . . . as shown in FIG. 2(i). . These position data QP(a) and origin data Q20.
are FIG. 2(j) from the timing control circuit 18,
By the load signals LD and LD2 shown in (k), the P/S
The serial clock 5 is loaded into the data conversion circuit 17.
In synchronization with CK (FIG. 2(m)), parallel data is converted into serial data SD as shown in FIG. 2(f) and output.

The intelligent encoder repeats the operation of converting the position data QP and origin data Q2 from parallel data to serial data SD and outputting the same every time the strobe signal 5TRB is input from the outside.

Since the serial data SD obtained in this way is transmitted to the outside as rotation information, the detection Even when the frequency of the two-phase pulse signals PA and PB increases by increasing the number of pulses per rotation of the motor to increase resolution or by rotating the motor at high speed, the conventional signal transmission There is no problem and reliability in signal transmission is easily ensured.

〔Effect of the invention〕

As explained above, according to the present invention, position data and origin data are generated within the encoder and output as serial data, so that the two-phase pulse signal is processed inside the encoder and is not output to the outside. Even if the frequency of the pulse signal becomes high, it is processed normally inside the encoder, and the motor position can be detected as low-frequency serial data without being affected by the resolution of motor rotation angle detection or the motor rotation speed. This is effective and can prevent deterioration in signal transmission reliability.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing one embodiment of the present invention, and FIG.
Operation timing chart 1-2 for explaining the operation of the intelligent encoder shown in FIG. 3 is a block diagram of a conventional encoder. 11...2-phase pulse signal generation section 12...Origin signal generation section 13...Direction discrimination/edge detection circuit 14...
・Up/down counter 15...Position data launch 16...Origin data latch 17...P/S data conversion circuit 18...Timing control circuit 31...2 Phase pulse signal generation section 32... Origin signal generation section 33... Driver agent Patent attorney Yoshiyuki Iwasa Figure 3

Claims (1)

[Claims] (1) An encoder that detects the amount of rotation angle and rotation direction of the motor uses two-phase pulse signals to determine the direction, detect edges, count with an up-down counter, and synchronize with the strobe signal. a position data generation unit that temporarily stores the count value of an up/down counter using the origin signal and generates the position data; An encoder comprising: a data conversion circuit for converting position data and origin data from parallel data to serial data and transmitting the serial data in synchronization with a serial clock.