JP3379542B2 - Inverter device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inverter device,
In particular, it concerns inverter devices that operate multiple induction motors.
I do. [0002] 2. Description of the Related Art FIG.
FIG. 2 is a block diagram of a conventional system for driving an induction motor.
You. The inverter 201 is an induction motor 6₁, 6_Two,
…, 6_nMain circuit to supply AC power of desired frequency to
202 and a main circuit unit 202 in accordance with an external operation command.
A control circuit unit 203 for driving and controlling the
And an output terminal 213. Main circuit section 20
2 is a converter for converting the commercial power supply 5 into a DC voltage.
Converter 204 and the DC power converted by the converter 204.
A smoothing circuit unit 205 for absorbing pressure fluctuations, and
An inverter unit 206 for converting into AC power of a desired frequency;
It is composed of The control circuit unit 203 further includes a current
Detection circuit 208, voltage detection circuit 209, sequencer
The operation command including the speed command from 20 is input to the input terminal 212.
Through the voltage detection circuit 209 and the power supply.
The voltage and current signals from the current detection circuit 208 and the decoded
Computes the speed command and outputs the output of inverter device 201
A drive control circuit 207 for controlling voltage and output frequency;
The inverter unit 206 receives a control signal from the
, A voltage detection circuit 209,
And a voltage and current signal from the current detection circuit 208,
Damage to inverter device 201 due to overload or overvoltage
And a protection circuit 211 for preventing
You. The operation state of the inverter device 201 is determined by drive control.
The circuit 207 collects the signals via the output terminal 213.
Notify the Kensa 20. Next, the operation of the inverter device 201 will be described.
Will be explained. Drive control of operation command from sequencer 20
The circuit 207 reads and decodes through the input terminal 212.
Creates speed command to achieve desired output voltage and output frequency
The speed command and the voltage detection circuit 209 and the current detection
The voltage and current signals from the circuit 208 are compared and calculated, and
Or output suppression or output cutoff signal from the protection circuit 211.
Therefore, a control signal is given to the driving circuit 210. Drive circuit 2
10 is an inverter unit 206 according to a given control signal.
Drive. The driven inverter unit 206 is an induction motor.
Machine 6₁, 6_Two, ..., 6_nDesired output voltage, output equal to
A frequency (AC power of a desired frequency) is supplied. to this
More induction motor 6₁, 6_Two, ..., 6_nAre all the same time
Starts to rotate at the same speed. [0004] SUMMARY OF THE INVENTION The above-mentioned conventional invar
The data device has the following problems. (1) Multiple inverter motors can be used alone with one inverter
It is not possible to drive upright or in concert,
Operate two induction motors independently or in cooperation
Have multiple inverters or multiple inverters.
System to cooperate with
Becomes complicated, and the cost becomes high. (2) Induction motor that detects overheating of the induction motor during operation
Electronic thermal as a means of protecting
May be built-in. This electronic thermal is an induction motor
Induction motor due to overheating by detecting the current value supplied to the machine
Cuts the output current to the induction motor to prevent damage to the motor
Is what you do. However, multiple inverters
When operating with several induction motors connected,
The current value supplied to each of the conductive motives cannot be detected.
No. Therefore, the electronic thermistor built into the inverter device
Can not be used, each induction as an alternative to its electronic thermal
It is necessary to add a thermal relay for each motor,
Increase in cost. The present invention has been made to solve such a problem.
The purpose of this is
Operate several induction motors independently or in cooperation
And minimizes damage due to overheating of each induction motor.
Provide an inverter device that can be prevented at low cost
Is Rukoto. [0006] [MEANS FOR SOLVING THE PROBLEMS] To achieve the above object
In addition, the inverter device of the present invention converts commercial power to DC power.
The converter part to be converted and the direct
A smoothing circuit that absorbs fluctuations in the
Provided for each of the motives and output from the smoothing circuit
DC power converted to AC power at the desired frequency
Inverter to supply induction motor to
Provided for each of the inverter sections,
A control circuit unit for driving and controlling the data unit;From sequencer
An input terminal for inputting the operation command of Each induction motor
Output terminal for outputting the operating state of the
When, Input operation commands from the host computer and
Communication interface that outputs the operating status to the
And Via input terminal or communication interface.
Operation input from PLC or host computer
Decode commands and create operation commands for each induction motor
The command is given to the control circuit corresponding to each induction motor.
Input the operation status of the induction motor from the control circuit.
Sequence through the output terminal or communication interface.
Sequence control unit that outputs to a sensor or host computer
When, The operation command and the operation status can be input and output
Input / output via the
First parameter to select whether to input or output via
When input / output is performed via an external terminal,
Second to assign specific functions of operation command and operation state
Has parameter setting memory for setting parameters
To. [0007] According to the present invention, a plurality of induction motors can be connected to each other.
Provided with a converter and control circuit, and external driving finger
And decipher the order, create operation commands for each induction motor,
Sequence control unit to be given to the control circuit unit corresponding to each induction motor
Is provided. Therefore, multiple induction motors
It can operate independently or in concert.
Further, in the present invention, the control circuit unit is attached to each induction motor.
Built-in electronic thermal in each control circuit
Detecting the current value supplied to the induction motor,
Damage due to overheating of the motor can be prevented. [0008] [0009] BRIEF DESCRIPTION OF THE DRAWINGS FIG.
Will be explained. FIG. 1 shows one embodiment of the present invention.
Of a system that drives multiple induction motors with
It is a lock figure. The inverter device 1 connects the commercial power supply 5 directly.
Converter unit 2 for converting the power into
A smoothing circuit unit 3 for absorbing a change in the converted DC voltage,
DC power is converted to AC power at a desired frequency (desired output voltage,
Output frequency), and the induction motor 6₁, 6_Two, ..., 6
_nInverter unit 4 that supplies each of₁, 4_Two,…,
4 _nAnd the inverter unit 4₁, 4_Two, ..., 4_nFrom outside
Control circuit 7 for driving and controlling according to the operation command₁, 7
_Two, ..., 7_nAnd the operation command 14 from the sequencer 20
An input terminal 16 for inputting, and an induction motor 6₁,
6_Two, ..., 6_nOperation status 15 is output to sequencer 20
Output terminal 17 and the host computer 21
Operation command 14 from the host computer 21
A communication interface 18 for outputting the operating state 15 to the
External via the input terminal 16 or the communication interface 18
Unit (sequencer 20 or host computer 21)
The operation command 14 input from the₁
~ 6_nIs generated, and the control circuit unit 7₁
~ 7_nAnd the control circuit unit 7₁~ 7_nElectric induction from
Machine 6 ₁~ 6_nInput the operating state 15 and output terminal 17
Or the sequencer 20 via the communication interface 18.
Or the sequence control unit 13 for outputting to the host computer 21.
And the operation command 14 and the operation state 15 are output to the input terminal 16
Input / output via the external terminal of terminal 17, or
Select whether to input / output via communication interface 18
And input / output via an external terminal.
The operation command and operation status
To which the parameter B that assigns the dynamic function is set
And a data setting memory 19. Control circuit section 7₁Is a voltage detection circuit 8
Flow detection circuit 9₁And an operation command 14 from the sequence control unit 13.
And a voltage detection circuit 8 and a current detection circuit 9₁Electricity from
Comparing the voltage and current signals to calculate the desired output voltage and output frequency
Drive control circuit 10 for controlling wave number₁And the drive control circuit 1
0₁Inverter 4 with control signal from₁Drive to drive
Circuit 11₁And a voltage detection circuit 8 and a current detection circuit 9₁
Voltage and current signals from the
Converter unit 2, smoothing circuit unit 3, inverter unit 4₁ When
Induction motor 6₁Protection circuit 12 for preventing damage₁
It is composed of By the way, the inverter unit 4₁When
Control circuit section 7₁Is an induction motor 6₁One for driving
This inverter device is equivalent to one inverter device.
A drive control system equivalent to the inverter is hereinafter referred to as a first-series inverter.
And The operating state 15 of the first series inverter is
Control circuit 10₁Are transmitted to the sequence control unit 13.
The control circuit unit 7i (i = 2 to n) is also a control circuit unit 7₁the same as
The current detection circuit 7i, the drive control circuit 10i, and the drive circuit 1
1i and a protection circuit 12i. However,
No voltage detection circuit 8 is provided. Therefore,
The inverter 1 has a first series inverter and a second series inverter.
And an n-th inverter.
You. Next, the operation of the inverter device 1 will be described.
I will tell. (1) First, according to the operation command 14 from the sequencer 20
Induction motor 6₁, 6_Two, 6_nWhen driving independently
Will be described. First, the operation command 14 and the operation state
15 is an external terminal (input terminal 16 and output terminal 17)
Parameter setting memo so that input / output
Set to the address 19. Furthermore, it is assigned to the external terminal.
The specific function (parameter B) is set as shown in FIG.
Set it. In FIG. 2, the inverter device 1 includes
Out of m external terminals (terminal numbers 1 to m)
No. 1 external terminal to induction motor 6₁The first series that drives
The external end of terminal number 2 is
Terminal to the reverse operation / stop command of the first series inverter.
External terminals with numbers mk (0 <k <m) are
Data speed command. Similarly, the induction motor 6_Two
Forward run / stop command of the second series inverter that drives
Reverse run / stop command and speed command
4, mk + 1 external terminals, and the induction motor 6_n
Forward run / stop command for the n-th inverter to drive
Reverse run / stop command and speed command are assigned to terminal numbers 5 and 5, respectively.
6, allocated to the external terminals of m−k + 2. Also, the first system
Operation status of each inverter in the row, second series, and nth series
State 15 is output, while the first series inverter is abnormal,
The operating state 15 of running and speed matching is
Assigned to the external terminals of numbers 10, 11, and 12,
During abnormalities, running, and speed matching of the two-series inverter
Assigned to the external terminals of terminal numbers 13, 14, 15 respectively
If the n-th inverter is abnormal, running, or during speed matching,
Assigned to external terminals with terminal numbers 16, 17, and 18, respectively
You. Note that the speed command terminal is dedicated to input in advance, and
The range of terminal numbers that can be assigned is fixed. Other end
Child can be used as input or output
Can be selected by setting parameter B.
it can. Next, from the sequencer 20 to the induction motor 6₁Luck
To the external terminals of terminal numbers 1, 2, mk
When the desired data is input through the
According to the data set in parameters A and B
Decoding and control circuit unit 7₁Drive control circuit 10₁Driving finger
Give order 14. Drive control circuit 10₁Is the operation command
14 and voltage detection circuit 8 and current detection circuit 9₁Electricity from
Comparing and calculating the pressure and current signals or the protection circuit 12₁
Output power according to output suppression and output cutoff signals.
Control the pressure and output frequency, and₁Control signal
give. Drive circuit 11₁According to the given control signal
Inverter section 4₁To drive the inverter 4₁Is induction
Motivation 6 ₁Output voltage and output frequency (desired AC voltage
Power). Operation from the sequencer 20
The first series inverter operates according to the
Motivation 6₁Will be driven. Operating state in this case
15 is a drive control circuit 10₁Is a comparison operation, or
Protection circuit 12₁Do not follow the output suppression or output cutoff signal from
Which process is selected for parameters A and B
According to the conditions of abnormal, driving, and speed matching.
Tell the control unit 13. The sequence control unit 13 sets the parameter A and
And terminal numbers 10, 11, and
Operation state 15 to sequencer 20 via external terminal 12
Is output. Next, from the sequencer 20 to the induction motor 6_Two
And 6_nTerminal numbers 3, 4, mk
+1 external terminal and outside terminal numbers 5, 6, mk + 2
When desired data is input to each terminal,
Desired data for external terminals of child numbers 1, 2, mk
Input to the induction motor 6₁Same idea as driving
Depending on the operation command 14 from the sequencer 20
The second and n-th inverters operate to drive the induction motor
Machine 6_TwoAnd 6_nWill be driven. In this case
The operating state 15 is also the driving control circuit 10_TwoAnd 10_nGa drive
Motion control circuit 10₁By performing the same operation as
External terminals of terminal numbers 13, 14, 15 and
Through external terminals of terminal numbers 16, 17, and 18.
Output to the sensor 20. From the above, the induction motor 6₁, 6
_Two, 6_nWill be operated independently. (2) Next, according to the operation command 14 from the sequencer 20,
Induction motor 6₁, 6_Two, 6_nWhen driving at the same time
explain about. When the parameter A is operated independently
Set the same as above. Parameter B is as shown in FIG.
To the external terminal of terminal number 1 for forward run / stop command
Set the external terminal of number 2 to the reverse run / stop command,
-K external terminal as speed command, terminal number 10-18
The terminals are assigned the same as in the case of independent operation,
The operation sequence number of terminal numbers 1, 2, and mk
Respectively, three of 1, 2, and n are set. Next, the sequence
From the sensor 20 to the external terminals of terminal numbers 1, 2, mk
When the data is input, the sequence control unit 13
Decoding according to the data set in parameters A and B
And the control circuit unit 7₁, 7_Two, 7_nDrive control circuit 1
0₁, 10_Two, 10_nAt the same time
I can. As a result, the first, second, and n-th sequence
The same operation at the same time, and the induction motor 6₁,
6_Two, 6_nWill be operated simultaneously. In this case
The operation state 15 is the drive control circuit 10₁, 10_Two, 10_nBut
Each is transmitted to the sequence control unit 13,
Through external terminals with terminal numbers 10 to 18
20 is output. The above description is based on the induction motor 6₁, 6_Two, 6
_nWhen driving independently or all at the same time
The operation in the case of
Induction motor 6₁And 6_TwoSimultaneously with the induction motor 6_nIs
Induction motor 6₁, 6_TwoCan be driven independently
You. In addition, the induction motor 6₁ , 6_Two , 6_n Cooperative driving
The operation sequence is assembled by the sequencer 20, and the first, second,
The operation sequence is executed by the n-th inverter.
And the induction motor 6₁, 6_Two, 6_nDriving in concert
be able to. (3) Finally, communication with the host computer 21 is performed.
Induction motor 6₁, 6_Two, 6_nOperation when driving
Will be described. Parameter A (run command 14 and run
State 15) is input / output via the communication interface 18.
So that the communication data is as shown in FIG.
Then, the sequence control unit 13 decodes the communication data and
Column, the second series, and the nth series inverter as the communication data
Operate according to the described operation command 14, and
Motivation 6₁, 6_Two, 6_nLuck independently or in concert
Can be turned over. Incidentally, the circuit configuration of the inverter device 1
Are the first, second, ..., n-th inverters
Induction motors 6 connected respectively₁, 6_Two, ..., 6_nTo
Since the value of the supplied current can be detected,
Motivation 6₁, 6_Two, ..., 6_nTo prevent damage due to overheating
The electronic thermal is connected to the first, second,.
Each can be built into the barter. This allows
Induction motor 6₁, 6_Two, ..., 6_nLow damage due to overheating
It can be prevented at cost. [0015] As described above, according to the present invention, a plurality of
An inverter and a control circuit are provided for each induction motor.
And further decodes operation commands from outside,
Series that creates operation commands for the machine and gives them to the control circuit
By providing the control unit, with one inverter device,
That is, multiple inverter devices are required as in the past.
Without the complexity of the system
Therefore, multiple induction motors can be used independently without increasing cost.
It can be driven upright or in concert,
An electronic sensor that prevents damage to the induction motor during operation due to overheating.
Can be used for each induction motor
There is no need to attach a thermal relay to the
The effect is that overheating of the induction motor can be prevented.
is there.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a system for operating a plurality of induction motors with one inverter device in one embodiment of the present invention. FIG. 2 is a diagram showing an example of input / output and functions assigned to external terminals when the induction motors 6 ₁ , 6 ₂ , 6 _n in FIG. 1 are operated independently. FIG. 3 is a diagram showing an example of input / output and functions assigned to external terminals when the induction motors 6 ₁ , 6 ₂ , 6 _n in FIG. 1 are operated simultaneously. FIG. 4 is a diagram showing communication data. FIG. 5 is a block diagram of a conventional system that drives a plurality of induction motors with one inverter device. [Description of Signs] 1 Inverter device 2 Converter unit 3 Smoothing circuit unit 4 ₁ , 4 ₂ , ..., 4 _n Inverter unit 5 Commercial power supply 6 ₁ , 6 ₂ , ..., 6 _n Induction motors 7 ₁ , 7 ₂ , ..., 7 _n control circuit 8 the voltage detection circuit _{9 1, 9 2, ...,} 9 n current detecting circuit _{10 1, 10 2, ...,} 10 n drive control circuit _{11 1, 11 2, ...,} 11 n driving circuit 12 _1, 12 ₂ ,..., 12 _n protection circuit 13 sequence control unit 14 operation command 15 operation state 16 input terminal 17 output terminal 18 communication interface 19 parameter setting memory 20 sequencer 21 host computer

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02P 7/74 H02M 7/48

Claims (1)

(57) [Claim 1] A converter unit for converting a commercial power supply into DC power, a smoothing circuit unit for absorbing fluctuations of the DC voltage converted by the converter unit, and a plurality of induction motors And an inverter unit that converts the DC power output from the smoothing circuit unit into an AC power of a desired frequency and supplies the AC power to a corresponding induction motor, corresponding to each of the plurality of inverter units. And a control circuit section for driving and controlling the corresponding inverter section, and an input terminal for inputting an operation command from the sequencer
And outputting the operating state of each induction motor to the sequencer.
An operation command is input from an output terminal and a host computer.
Communication interface that outputs operating status to
Previous through scan and, the input terminal or said communication interface
Input from the sequencer or the host computer.
The operation command is decoded and the operation command for each induction motor is
Control circuit corresponding to each induction motor.
Operation state of the induction motor from the control circuit unit.
State, and input the output terminal or the communication interface.
The sequencer or the host computer
A series control unit that outputs the operation command and the operation state to the input terminal and the output terminal.
Input / output via the external terminal of the terminal, or
Select input / output via communication interface
The first parameter and the input / output via external terminals
In this case, the operation command and the operation state
Parameter to which the second parameter to assign the function is set
An inverter device having a data setting memory.