JP2004120813A - Method and system for controlling motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control system for a motor in which inputting of a control command for a motor is switched from a network or from an external I/F. <P>SOLUTION: The control system of the motor is provided with an inverter 10 that controls a motor 9 with variable voltage and variable frequency based on the speed command and the trigger command for the motor 9, a communication I/F6 for communication of the speed command and trigger command through the network from a host computer, and an analogue input I/F8 where the speed command is inputted as an analogue value. It is also provided with an external terminal I/F7 where at least two on/off signal is inputted; a discriminating part 30 that generates discrimination signal according to the combination of on/off inputted in the external terminal I/F7; and a operation command means that gives the speed command and trigger command by selecting the communication I/F6, the analogue input I/F8, and the external terminal I/F7 based on the discrimination signal. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a motor control system that can select a network, an analog input terminal, and an external terminal based on an on / off signal for a start command, a stop command, and a speed command for controlling a motor, and a control method thereof.
[0002]
[Prior art]
A control system related to a conventional operation command device will be described with reference to Japanese Patent Application Laid-Open No. 2001-156891. In a vending machine or the like as an external device, an operation command device generates, for example, sales status data and the like, and transmits the data and the like to a remote host computer via a connector via a data communication terminal device through a PHS communication. In a system in which the data can be transferred or received by communicating via a line, the system has a switch unit for shifting to an operation mode of setting input, and the switch unit includes And a connector connected to the connector of the data communication terminal device, and switch means is connected between the two terminals.
[0003]
When the setting input is shifted to the operation mode, the operation is shifted only when the switch means is turned on. Therefore, the operation mode shift switch is not provided on the data communication terminal device side. Therefore, it is possible to prevent the transition of the setting input to the operation mode from being performed by erroneous operation, and it is not necessary to provide a space for providing a switch, so that downsizing can be achieved.
[0004]
[Problems to be solved by the invention]
However, the operation command device transmits data to the host computer via the PHS simply by the control circuit judging the switch input by the switch means. As an example of giving a command from a host computer via a network in this manner, in a network system in which a plurality of motor control devices are connected, a speed command and a start command to the motor are input via the network.
On the other hand, in installation adjustment (start-up) of the control system of the motor, first, a start command or the like is given to the motor without going through a network so that the control device, the motor, the driven object of the motor, etc. operate without trouble. After confirming the above, it is desirable that the operation of the motor control system as a whole be confirmed stepwise by giving a motor speed command or the like to the control device via the network.
However, if the above control system gives a speed command or the like to the motor via a network, it is necessary to check the network of the motor operation command and the like and all of the motor and the driven objects of the motor, and adjustment work such as installation is required. There was a problem that it was complicated.
[0005]
The present invention has been made in order to solve the above problems, and includes a communication interface for transmitting and receiving a motor control command from a network, an analog interface provided in or near the motor control device, and at least two external terminals. An object of the present invention is to provide a motor control system and a control method thereof, which can select the communication interface, analog interface, and external terminal by determining a combination of on / off signals.
[0006]
[Means for Solving the Problems]
A motor control system according to the present invention includes a motor speed command, a motor control unit that controls the motor with a variable voltage and a variable frequency based on a start command, and the speed command and a start command from a host computer via a network. Communication interface means for receiving an operating state signal based on the motor control means, an analog interface means for receiving the speed command as an analog value, and at least two on / off signals when the start command is input. A first external interface unit to which a signal is input, a determination unit that generates a determination signal in accordance with a combination of an on / off signal input to the first external interface unit, and the communication based on the determination signal Interface means, analog interface means, said external interface The speed command selecting means, is characterized in that and a first command selection means capable of providing the activation command.
According to such a motor control system, for example, the determination means determines a combination of at least two on / off signals input by the first external interface means, and the first command is issued based on the determination signal corresponding to the combination. The selection means selects such that the speed command and the start command from the host computer can be transmitted to the communication interface means via the network.
Further, for example, based on the determination signal, the first command selecting means inputs the speed command to the analog interface means and selects so that the start command can be input to the first external interface means.
According to such a motor control system, in the installation adjustment, a speed command is input to the analog interface means, and a start command is input to the first external interface means to drive the motor, thereby controlling the motor and its driven object. You can drive while observing. After confirming that there is no abnormality in the motor and the driven object by such an operation, a speed command and a start command can be given to the motor via the network, so that the installation adjustment of the motor control system becomes easy. is there.
[0007]
Furthermore, a speed command and a start command are input to the communication interface means from the host computer based on the determination signal, and a stop command is input to the second external interface means. It is something that can be added.
Therefore, after confirming that there is no abnormality in the motor and the driven object, the speed command and the start command can be given to the motor via the network. Since a command to stop the motor can be given from the interface means, there is an effect that the safety of installation adjustment in the motor control system is further improved.
[0008]
A motor control method according to another invention includes a first step of inputting a speed command to an analog interface means as an analog value based on a determination signal and inputting a start command to a first external interface means, And a second step of inputting a speed command and a start command via the communication interface means based on the first step, and after the first step is executed, the second step is executed.
Therefore, in the installation adjustment of the motor control system, the motor and the driven object are observed by inputting the speed command to the analog interface means and inputting the start command to the first external interface means to drive the motor. You can drive while driving. After confirming that there is no abnormality in the motor and the driven object by such an operation, a speed command and a start command can be given to the motor via the network, so that the installation adjustment of the motor control system becomes easy. is there.
[0009]
The method further comprises a third step of inputting a stop command to the second external interface means based on the selection of the second command selection means, and inputting a speed command and a start command via the communication interface means. , The third step, and the second step.
Therefore, after confirming that there is no abnormality in the motor and the driven object, the speed command and the start command can be given to the motor via the network. Since a command to stop the motor can be given from the interface means, there is an effect that the safety of installation adjustment in the motor control system is further improved.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiment 1 FIG.
A motor control system according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is an overall view in which a motor control system according to an embodiment is applied to a device that drives a motor by an inverter device.
In FIG. 1, a motor control system 1 includes a three-phase induction motor (hereinafter, referred to as a motor) 9 for driving a driven object (not shown), and an inverter unit for converting DC power for controlling the motor 9 to AC power. 10, an interface unit 20 having a communication interface (hereinafter, the interface is appropriately referred to as I / F) 6, an external terminal I / F7, and an analog input I / F8, and an operation command of the motor 9 are input to the external terminals X1 and X2. The communication I / F 6, the external terminals Xs and Xe of the external terminal I / F 7, and the analog input I / F 8 are selected based on a determination signal generated according to the result of the determination. And a determination unit 30 to be used.
[0011]
The inverter unit 10 includes a converter 2 for converting the three-phase AC voltages R, S, T to a DC voltage, a smoothing capacitor 3 for smoothing a DC voltage having a pulsating component, and a motor for converting the DC voltage to an AC voltage. 9 for supplying the power to the inverter 9.
[0012]
The interface unit 20 receives a speed command, a start command, an emergency stop command, and the like of the motor 9 via a network from a host computer (not shown), and transmits an operation state signal and the like of the inverter device 100 from the inverter device 100 via the network. A communication I / F 6 connected to a terminal N1 and an analog command value corresponding to a speed command value, and an analog input terminal. An analog I / F 8 connected to A1, an external terminal X1 to which a first on / off signal is input, an external terminal X2 to which a second on / off signal is input, and an emergency for urgently stopping the operation of the motor 9 An external terminal I / F7 having an external terminal Xe to which a stop command is input and an external terminal Xs to which a start command is input is provided. There.
[0013]
The determination unit 30 includes an interface unit 20, a CPU 5, a ROM 21, a RAM 25 as storage means, and an output I / F 27. The ROM 21 stores a control program to be executed by the CPU 5, that is, a program corresponding to the flowchart of FIG. 3 described later, and the RAM 25 is formed so as to also provide the CPU 5 with a work area.
[0014]
The motor control system configured as described above will be described with reference to FIGS. FIG. 2 is a time chart of the first and second on / off signals input to the external terminals X1 and X2 in the motor control system. FIG. 3 is a flowchart of the determination means and command selection means in the motor control system. FIG. 6 is a selection diagram of a motor command based on a state of a determination unit.
Now, when starting up the motor control system 1, first, the normal operation of the inverter device 100, the motor 9, and the driven object (not shown) of the motor 9 is confirmed. A three-phase AC power supply is input to the converter 2 and a DC voltage is generated at the output. In order for the operator to operate the motor 9 while checking the state of the motor 9 and the like, an off signal is supplied to the external terminal X1 and an external terminal is provided. When an ON signal is input to X2, the CPU 5 takes in the input signals of the external terminals X1 and X2 (step S101), determines whether the signal input to the external terminal X1 is on or off (step S103), and determines that the signal is off. Then, it is determined whether the signal input to the external terminal X2 is on or off (step S105). When it is determined that the signal is an on signal, a determination signal A is generated. Steps S103 and S105 correspond to the determining means of the present invention.
[0015]
The state 3 is selected by the determination signal A (step S111), and as shown in FIG. 4, a start command, an external terminal I / F7 via the external terminal X, a speed command, and an analog I / F via the analog input terminal A1 are input. F8, an operation mode is set so that an emergency stop command can be input from the external terminal Xe, respectively (step S120, corresponding to the first command selecting means of claim 1, the first step of claim 3). When a start command and a speed command are input to the / F7 and the analog input terminal A1, respectively, the CPU 5 takes in the speed command and the start command of the motor 9, and gives the start command and the speed command to the inverter 4, so that the The variable frequency / variable voltage is applied, and the motor 9 rotates.
When the operator is operating while checking the operation of the motor 9, it is determined that the operation of the motor 9 and the driven object (not shown) of the motor 9 is malfunctioning due to an increase in vibration or noise for some reason. Then, when the operator inputs an emergency stop signal to the external terminal Xe, the CPU 5 stops the operation of the inverter unit 10 based on the emergency stop signal, and immediately stops the motor 9.
[0016]
Here, by removing the cause of the malfunction of the motor 9 and the like, if it can be confirmed that the motor 9 operates normally based on the start command and the speed command from the external terminal Xs and the analog input terminal A1, the external When an off signal is input to the terminal X1 and an off signal is input to the external terminal X2, the CPU 5 fetches input signals from the external terminals X1 and X2 (step S101) and determines whether the signal input to the external terminal X1 is on or off. (Step S103) If it is determined to be off, it is determined whether the signal input to the external terminal X2 is on or off (Step S105). If it is determined to be off, a determination signal B is generated. Steps S103 and S107 correspond to the determining means in claim 1.
[0017]
State 1 is selected by the determination signal B (step S109), and as shown in FIG. 4, a speed command and a start command of the motor 9 from a host computer (not shown) are transmitted from the network via the communication I / F 6 and an emergency stop command. The operation mode is set so that the operation mode can be input from the external terminal I / F7 via the external terminal Xs (step S120, corresponding to the second command selecting means of claim 2, and the third step of claim 4), When a start command and a speed command are input from the communication I / F 6, the CPU 5 takes in the start command and the speed command of the motor 9, and supplies the start command and the speed command to the inverter 4 to drive the motor 9.
[0018]
Here, when the operator inputs an emergency stop command to the external terminal Xe due to the malfunction of the operation of the motor 9 such as vibration or noise, the CPU 5 gives the emergency stop command to the inverter 4 preferentially. The operation of the motor 9 is stopped and the power supply to the motor 9 is interrupted to stop the motor 9 urgently.
Therefore, the emergency stop command is not given to the inverter unit 10 via the host computer (not shown) after the malfunction of the motor 9 or the like is found, so that the motor 9 can be quickly stopped in an emergency.
[0019]
Next, when it is confirmed by a network from a host computer (not shown) that the motor 9 operates normally according to the speed command and the start command of the motor 9, the operator sends an ON signal to the external terminal X1 and a signal to the external terminal X2. When the off signal is input, the CPU 5 takes in the input signals of the external terminals X1 and X2 (step S101), determines whether the external terminal X1 is on or off (step S103), and when it determines that the external terminal X1 is on, turns on the external terminal X2. Is determined (step S107), and if determined to be off, a determination signal C is generated.
[0020]
The state 2 is selected by the determination signal C (step S113), and the operation mode is set so that a start command, a speed command, and an emergency stop command of the motor 9 can be input from the network to the terminal N1 as shown in FIG. S120, corresponds to the first command selecting means of claim 1, the second step of claim 3, and when a start command or the like is input to the terminal N1 via a network, the CPU 5 transmits the start command and the speed command. The motor 9 is driven by giving the signal to the inverter 4. That is, the final confirmation of the motor control system 1 can be made by giving a start command or the like of the motor 9 from a host computer (not shown).
[0021]
As described above, the motor control system 1 provides the speed command of the motor 9 from the analog input terminal A1 and the start command and the emergency stop command from the external terminals Xs and Xe without passing through the network, and the inverter device 100 and the motor 9 After the operation of the driven object (not shown) is normally confirmed, a speed command and a start command of the motor 9 can be given from a host computer (not shown) via a network. Therefore, initial setting in installation of the motor control system 1 can be smoothly performed.
[Brief description of the drawings]
FIG. 1 is an overall view of a motor control system according to an embodiment of the present invention.
FIG. 2 is a time chart of first and second on / off signals input to external terminals X1 and X2 in the motor control system according to the embodiment;
FIG. 3 is a flowchart of a determination unit and a command selection unit in the motor control system according to the embodiment;
FIG. 4 is a command selection diagram based on a state of a determination unit in the motor control system according to the embodiment;
[Explanation of symbols]
1 motor control system, 6 communication I / F (communication interface means), 7 external terminal I / F (first and second external interface means), 8 analog input I / F (analog interface means), 9 motor, DESCRIPTION OF REFERENCE NUMERALS 10 inverter unit, 20 interface, 30 determination unit (determination unit, first and second command selection unit), 100 inverter device.

Claims (4)

Motor control means for controlling the motor with a variable voltage and a variable frequency based on a speed command of a motor having a driven target and a start command,
A communication interface unit for receiving the speed command and the start command from a host computer via a network, and transmitting an operation state signal based on the motor control unit;
Analog interface means for receiving the speed command as an analog value,
First external interface means to which the start command is input and at least two on / off signals are input;
Determining means for generating a determination signal in accordance with a combination of on / off signals input to the first external interface means;
A first command selection unit that can select the communication interface unit, the analog interface unit, and the external interface unit based on the determination signal to provide the speed command and the start command;
A motor control system comprising: Second external interface means to which the motor stop command is input;
A second command selection unit configured to input the speed command and the start command from the host computer to the communication interface unit based on the determination signal and to apply the stop command to the second external interface unit; ,
The motor control system according to claim 1, further comprising: A first step of inputting the speed command as an analog value to the analog interface means based on the selection of the first command selection means and inputting the start command to the first external interface means;
A second step of inputting the speed command and the start command through the communication interface means based on the selection of the first command selection means, and after executing the first step, the second step Perform the steps of
The motor control method according to claim 1, wherein: A third step of inputting the stop command to the second external interface means based on the selection of the second command selection means, and inputting the speed command and the start command via the communication interface means. ,
Executing the first step, the third step, and the second step in this order;
The motor control method according to claim 2, wherein:

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