JPH0638569A - Encorder signal transmitter - Google Patents

Abstract

PURPOSE:To make the reliability of wiring higher by reducing the number of signal lines for the encorder signal in a servomotor. CONSTITUTION:A speed detecting means 13 for producing the speed data from an encorder signal, a position detecting means 14 for producing a position data from the encorder signal, a serial signal transmitting means 15 for converting these speed and position data into a serial signal, and a line driver 16 for transmitting and outputting this serial signal, are provided in the encorder 11 of a servomotor. And the serial signal transmitted from this line driver 16 is received by a line receiver 19 in a driver 17. Furthermore, the serial signal received is converted into a speed data and a position data by a serial signal receiving means 20 and outputted. And speed and position control are performed on the basis of these output data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a servo motor encoder signal transmission device for controlling position and speed.

[0002]

2. Description of the Related Art Conventionally, an encoder for a servo motor is D
The C servo requires three signals of A, B, and Z phases, and the AC servo requires signals of U, V, and W phases to be added, and six signals are required. These signals are individually transistor open collector system or line driver. The signal is transmitted to the driver by the method.

A conventional encoder signal transmission device will be described below. FIG. 2 is a block diagram of a conventional encoder signal transmission system. In FIG. 2, the line driver 3 to which the signal processing circuit 2 of the encoder 1 is connected has a signal line 6 between each line driver 3 and the line receiver 5 in order to transmit the encoder signal to the line receiver 5 of the driver 4. Each is connected.

The operation of the encoder signal transmission device configured as described above will be described below. First, in the encoder 1, as the rotor rotates, the signal processing circuit 2 generates pulses from the rotation amount, the line driver 3 transmits signals to the driver 4, and the line receiver 5 receives signals. ing.

[0005]

However, in the above-mentioned conventional structure, the number of signal lines 6 is required for the number of signals, and the number of conductors is increased, so that the reliability of the signal lines 6 such as disconnection of the signal lines 6 is deteriorated. Was there.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide an encoder signal transmission device capable of saving the signal line of the encoder signal in the encoder of the servo motor.

[0007]

In order to solve the above problems, an encoder signal transmission device of the present invention is a servo motor encoder signal transmission device for position and speed control, and detects speed data from an encoder signal. It is provided with a speed detecting means, a position detecting means for detecting position data from the encoder signal, and a serial communication means for converting the speed data and the position data into a serial signal for transmission and output.

[0008]

With the above structure, the speed detecting means generates the speed data, the position detecting means generates the position data, and the serial communication means converts the speed data and the position data into a serial signal for transmission and output. Since the number of signal lines for signals is one, it is possible to reduce the number of signal lines.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of an encoder signal transmission system according to an embodiment of the present invention. In FIG. 1, an encoder 11 includes a signal processing circuit 12 that generates a pulse based on the rotation amount of a rotor when the rotor rotates,
The speed detection means 13 for speed data detection and the position detection means 14 for position data detection to which this signal processing circuit 12 is connected
A serial signal transmitting means 15 for connecting the speed detecting means 13 and the position detecting means 14 to convert the speed data and the position data into a serial signal; and a line driver 16 to which the serial signal transmitting means 15 is connected. Has been. Further, the driver 17 is provided with a line receiver 19 connected from the line driver 16 of the encoder 11 via a signal line 18, and a serial signal receiving means 20 to which the line receiver 19 is connected. Is converted into velocity data and position data by the serial signal receiving means 20.

The operation of the encoder signal transmission device configured as described above will be described below. First, in the encoder 11, as the rotor rotates, the signal processing circuit 12 generates a pulse from the rotation amount, the speed detection unit 13 generates speed data from the pulse, and the position detection unit 14 also generates the speed data. Generate position data. The serial signal transmitting means 15 converts these speed data and position data into a serial signal, and the line driver 16 outputs the signal to the driver 17 via the signal line 18.

The driver 17 is a line driver.
The signal from 16 is received by the line receiver 19 through the signal line 18, the serial signal receiving means 20 converts the signal, the speed data and the position data are output, and the speed and the position are controlled based on these data. To do.

Therefore, inside the encoder 11, there are provided a speed detecting means 13 and a position detecting means 14, and a serial communication means consisting of a serial signal transmitting means 15 and a line driver 16, and from the encoder signal of the servo motor to the inside of the encoder. Since the speed data and the position data are generated and serially communicated with each other, the number of signal lines of the encoder signal becomes one, so that the number of signal lines can be reduced and the reliability of the wiring can be improved.

In this embodiment, the signal driver is provided with the line driver 16 and the line receiver 19.
A method using an open collector of a transistor may be used. Although the signal line 18 is a conductor, it may be transmitted by optical communication, the signal line 18 may be an optical cable, and the line driver 16 and the line receiver 19 may be optical I / O. In this case, if the A signal, the B signal, and the Z signal of the encoder are modulated and sent to improve noise resistance, the processing speed becomes very high. If a position counter and speed detecting means are provided and each data is transmitted in accordance with the processing time on the driver side, an optical communication system having a lower processing speed can be used as compared with the case where the encoder signal is directly modulated.

[0014]

As described above, according to the present invention, by providing the position / speed detecting means and the serial communication means inside the encoder, it is possible to reduce the number of encoder signal lines to one. An encoder signal transmission device with excellent wiring reliability can be realized.

[Brief description of drawings]

FIG. 1 is a block diagram of an encoder signal transmission system according to an embodiment of the present invention.

FIG. 2 is a block diagram of a conventional encoder signal transmission system.

[Explanation of symbols]

 11 Encoder 12 Signal processing circuit 13 Speed detection means 14 Position detection means 15 Serial signal transmission means 16 Line driver

Claims (1)

[Claims] 1. An encoder signal transmission device for a servo motor for position and speed control, comprising speed detection means for detecting speed data from the encoder signal, position detection means for detecting position data from the encoder signal, and An encoder signal transmission device comprising: a serial communication means for converting speed data and position data into a serial signal and transmitting and outputting the serial signal.