JP2002136179A - Motor control system - Google Patents

Abstract

(57) [Problem] To provide a motor control system that contributes to downsizing of equipment, improvement of reliability, and reduction of man-hours by reducing connection wires. SOLUTION: Data generation means 11, data transmission means 1
2. Encoder 14 having superimposing means 13, power supply means 15, data separating means 16, driver 18 having data receiving means 17, encoder 14 and driver 18
And data transmission and power supply via the connection line.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor control system for driving a motor having an encoder.

[0002]

2. Description of the Related Art Generally, a motor control system includes a motor,
It is composed of an encoder for detecting position information of the motor, a driver for driving the motor, a controller for giving instructions to the driver, and the like.

Hereinafter, a motor control system for one-way communication will be described with reference to the drawings as a conventional example.

In FIG. 5, reference numeral 51 denotes data generating means for generating motor position information; 52, data transmitting means for transmitting data generated by the data generating means 51;
Reference numeral 3 denotes an encoder, which includes a data generation unit 51 and a data transmission unit 52; 54, a power supply unit for supplying power to the encoder 53; 55, a data reception unit for receiving data from the encoder 53; Power supply means 54 and data receiving means 55 are provided.

The driver 56 and the encoder 53 are connected by a power supply line 57 for supplying a voltage from the driver 56 to the encoder 53 and a data transmission line 58 for transmitting data from the encoder 53 to the driver 56.

Further, in the motor control system of the two-way communication, as shown in FIG.
2. Instead of the data receiving means 55, there are a data transmitting / receiving means 62 and a data transmitting / receiving means 65, respectively. A power supply line 57 for supplying power from the driver to the encoder and a data transmission line 58 for transmitting data are provided in the same manner as in one-way communication. Each was provided.

[0007]

However, in the above-mentioned conventional system, the power supply line and the data transmission line are required separately in both one-way communication and two-way communication, and the number of connection lines is large. Furthermore, since the connector terminal is usually attached to this connection line, the number of attachment steps is increased.

Further, mounting a motor and a driver in a device and performing wiring work requires securing a space corresponding to the number of connection lines, which has been an obstacle to miniaturization.

Further, there is a problem that the possibility of erroneous wiring or disconnection is increased due to the large number of connection lines, and the reliability is lowered.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a motor control system that contributes to downsizing of equipment, improvement of reliability, and reduction of man-hours by reducing connection lines.

[0011]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a motor, data generating means for generating position information of the motor, and data for transmitting position information generated by the data generating means. Transmitting means, an encoder comprising superimposing means for superimposing a power supply voltage on position information transmitted by the data transmitting means, data separating means for separating position information from superimposed data of the encoder, and data from the data separating means. Data receiving means for receiving, DC to the encoder via the data separating means
A driver having power supply means for supplying a voltage,
A connection line for supplying a voltage from the driver to the encoder, and performing one-way communication via the connection line.

A motor, data generation means for generating position information of the motor, data transmission / reception means for transmitting the position information generated by the data generation means and receiving a signal from a driver; An encoder comprising: a power supply voltage superimposed on position information to be transmitted, or superposition separation means for separating position information from a superposition signal from a driver to a data transmission / reception means; and an encoder which separates position information from superimposition data of the encoder, and Superimposition separating means for superimposing a power supply voltage on a signal to be transmitted to
A driver including data transmission / reception means for receiving the separated data from the superimposing / separating means, or transmitting a signal to the encoder, and a power supply means for supplying a DC voltage to the encoder via the superimposing / separating means; A connection line for supplying a voltage from the driver to the encoder,
The two-way communication is performed via the connection line.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to solve the above-mentioned problems, the present invention provides a motor, data generating means for generating position information of the motor, and data transmitting means for transmitting position information generated by the data generating means. An encoder having superimposing means for superimposing a power supply voltage on position information transmitted by the data transmitting means; a data separating means for separating position information from superimposed data of the encoder; and receiving data from the data separating means. A data receiving unit, a driver including a power supply unit that supplies a DC voltage to the encoder via the data separation unit, and a connection line that supplies a voltage from the driver to the encoder.
2. The motor control system according to claim 1, wherein the motor control system performs one-way communication via the connection line, and uses one of a high-pass filter, a low-pass filter, a band-pass filter, and a transformer for the superimposing unit and the data separating unit. 3. Since one-way data transmission from the encoder to the driver and power supply from the driver to the encoder can be performed by the same connection line, the number of connection lines can be reduced. In addition, space saving can be achieved by wire saving, and downsizing of the device and improvement in reliability can be achieved.

A motor, data generating means for generating position information of the motor, data transmitting and receiving means for transmitting position information generated by the data generating means and receiving a signal from a driver; An encoder comprising: a power supply voltage superimposed on position information to be transmitted, or superposition separation means for separating position information from a superposition signal from a driver to a data transmission / reception means; and an encoder which separates position information from superimposition data of the encoder, and Superimposition separating means for superimposing a power supply voltage on a signal to be transmitted to
A driver including data transmission / reception means for receiving the separated data from the superimposing / separating means, or transmitting a signal to the encoder, and a power supply means for supplying a DC voltage to the encoder via the superimposing / separating means; A connection line for supplying a voltage from the driver to the encoder,
4. The motor control system according to claim 3, wherein the motor control system performs bidirectional communication via the connection line, and any one of a high-pass filter, a low-pass filter, a band-pass filter, and a transformer is used as the superimposing / separating unit. 5. Since bidirectional data transmission and power supply from the driver to the encoder can be performed by the same connection line, the number of connection lines can be reduced. In addition, space saving can be achieved by wire saving, and downsizing and improvement of reliability of equipment can be achieved.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) In FIG.
Reference numeral 4 includes a data generating unit 11, a data transmitting unit 12, and a superimposing unit 13 as constituent elements. The driver 18 includes, as constituent elements, the power supply unit 15 and the data separation unit 1
6. It has data receiving means 17. Then, the encoder 14 and the driver 18 are electrically connected by a connection line 19.

Next, their operation will be described. First, a DC voltage to be supplied to the encoder 14 via the data separation unit 16 is output from the power supply unit 15 of the driver 18. Normally, a ground potential serving as a voltage reference and a potential having a certain potential difference with respect to the ground potential are output, passed through the data separating means 16, further passed through the connection means 19, and passed through the superimposing means 13 of the encoder 14 to the data generating means. 11 is supplied.

In the data generating means 11, the position information of the motor to which the encoder 14 is attached,
Data such as error information is generated. The data generated by the data generation unit 11 is transmitted to the data transmission unit 1.
The two signals RT and / RT whose logic is inverted through 2 are output to the superimposing means 13.

In the superimposing means 13, the two signals RT and / RT are sent to the driver 18 via the connection line 19. At this time, the two signals RT and / RT are high-frequency signals. Utilizing the fact that the existing power supply is DC, a low-pass filter 21 is installed in the superimposing means 13 between the connection line 19 and the data generation means 11 so that the high-frequency signals RT and / RT existing on the connection line 19 generate data. It is prevented from being transmitted to the means 11. The superimposing means 13 between the connection line 19 and the data transmitting means 12 includes a high-pass filter 2.
2 is installed to prevent the DC potential present on the connection line 19 from being transmitted to the data transmission means 12 (FIG. 2).

On the other hand, the data separating means 16 of the driver 18
, A low-pass filter 31 is installed in the data separating unit 16 between the connection line 19 and the power supply unit 15 in the same manner as the superimposing unit 13 of the encoder 14, for example.
9 is the power supply means 1
5 to prevent transmission. Also, a high-pass filter 32 is provided in the data separating means 16 between the connection line 19 and the data receiving means 17 so that the DC potential existing on the connecting line 19 is not transmitted to the data receiving means 17 (FIG. 3).

With the above configuration, data transmission from the encoder 14 to the driver 18 and voltage supply from the driver to the encoder can be performed only by the two connection wires 19.

The superimposing means and the data separating means are
If any one of a high-pass filter, a low-pass filter, a band-pass filter, and a transformer is used, the DC potential and high-frequency components can be easily removed.

(Embodiment 2) In contrast to Embodiment 1 in which data transmission between an encoder and a driver is one-way communication, Embodiment 2 is a case in which data transmission is bidirectional communication.

In FIG. 4, the data transmitting means 12 and the data receiving means 17 in FIG. 1 are replaced by a data transmitting / receiving means 42 and a data transmitting / receiving means 47, respectively.
If the data separating means 16 is the superimposing / separating means 43 and the superimposing / separating means 46, respectively, the two-way communication between the encoder 14 and the driver 18 is connected to the connection line 19 (2) as in the case of the one-way communication. Book) alone.

If the superimposing / separating means and the data transmitting / receiving means are constituted by any of a high-pass filter, a low-pass filter, a band-pass filter, and a transformer as in the first embodiment, the DC potential and high-frequency components can be easily removed. Can be.

[0026]

As is apparent from the above embodiment, according to the first aspect of the present invention, the connection between the encoder and the driver can be made by only the connection line, so that data transmission and power supply can be performed.
A motor control system capable of one-way communication is obtained.

According to the third aspect of the present invention, the connection between the encoder and the driver can be performed only by the connection line, so that data transmission / reception and power supply can be performed, and a motor control system capable of bidirectional communication can be obtained.

Further, according to the second and fourth aspects of the present invention, a motor control system can be realized more easily.

Accordingly, it is possible to provide a motor control system that contributes to downsizing of equipment, improvement of reliability, and reduction of man-hours by reducing the number of connection lines.

[Brief description of the drawings]

FIG. 1 is a block diagram of a motor control system according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing the inside of a superimposing unit according to the first embodiment of the present invention;

FIG. 3 is a block diagram showing the inside of a data separating unit according to the first embodiment of the present invention;

FIG. 4 is a block diagram of a motor control system according to a second embodiment of the present invention.

FIG. 5 is a block diagram of a conventional motor control system.

FIG. 6 is a block diagram of another conventional motor control system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Data generation means 12 Data transmission means 13 Superposition means 14 Encoder 15 Power supply means 16 Data separation means 17 Data reception means 18 Driver 19 Connection line 21, 31 Low pass filter 22, 32 High pass filter 42, 47 Data transmission / reception means 43, 46 Superposition Separation means

Claims (4)

[Claims] 1. A motor, data generating means for generating position information of the motor, data transmitting means for transmitting the position information generated by the data generating means, and a power supply voltage for the position information transmitted by the data transmitting means. An encoder including superimposing means for superimposing, data separating means for separating position information from superimposed data of the encoder, data receiving means for receiving data from the data separating means, and the encoder via the data separating means. DC
A driver having power supply means for supplying a voltage,
A motor control system comprising: a connection line for supplying a voltage from the driver to the encoder; and one-way communication via the connection line. 2. A high-pass filter, a low-pass filter, a band-pass filter,
The motor control system according to claim 1, wherein the motor control system uses any one of a transformer. 3. A motor, data generation means for generating position information of the motor, data transmission / reception means for transmitting position information generated by the data generation means and receiving a signal from a driver, and the data transmission / reception means An encoder comprising: a power supply voltage superimposed on position information to be transmitted, or superposition separation means for separating position information from a superposition signal from a driver to a data transmission / reception means; and an encoder which separates position information from superimposition data of the encoder, and Superimposing / separating means for superimposing a power supply voltage on a signal to be transmitted to, a data transmitting / receiving means for receiving separated data from the superimposing / separating means, or transmitting a signal to the encoder, and a DC voltage to the encoder via the superimposing / separating means. And a power supply means for supplying power to the encoder, and from the driver to the encoder. A motor control system, comprising: a connection line for supplying a voltage; and performing bidirectional communication via the connection line. 4. The motor control system according to claim 3, wherein any one of a high-pass filter, a low-pass filter, a band-pass filter, and a transformer is used as the superimposing / separating means.