JP2002272173A - Electric motor control apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric motor controlling apparatus for adjusting such setting values as startup adjustment simply by restraining the increase in cost in the electric motor control apparatus and using only a personal computer. SOLUTION: The electric motor control apparatus comprises a CPU 11 for performing control operation and a memory 13 for storing a data table for registering the amount of control to be outputted to the personal computer 121. The amounts for control, such as the current value, voltage value, speed, and frequency to be displayed on the personal computer 121 are registered in the data table being stored in the memory 13. Then, the registered amount of control is outputted from a serial interface (SIO) 21, regardless of the request from the personal computer 121.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method of changing the voltage, current, or frequency of electric power supplied to a motor.
The present invention relates to a motor control device that controls the speed or torque of a motor to a predetermined target value.

[0002]

2. Description of the Related Art In recent years, so-called digitized products have also been increasing in motor control devices for controlling motors. Such digitalized motor control devices have a large amount of data called set values. ing. For example, the set value includes a control gain of a control system such as a speed control system or a current control system.

[0003] These set values are different for each motor control device. For example, in the case of a current control system, a necessary current control system gain is determined by a resistance value and a reactance value in an electric circuit including a motor control device and a motor connected thereto. That is, the resistance value changes when the motor is different, and the resistance value changes even when the connection cable between the motor control device and the driven motor changes.

Therefore, when the motor control device and the motor are installed, it is necessary to adjust the set value of the current control gain every time the current control gain is changed.

[0005] As a method of adjusting the control gain, usually, a motor is operated, and a step-like input is applied to a control circuit.
By observing the temporal change of the control amount at that time, for example, when the control amount overshoots, the control gain is reduced and the step input is repeated again so that the control amount falls within a predetermined waveform. The control gain.

Here, in the present digitized motor control device, RS-232 is used for changing the control gain.
A serial interface such as C is provided and connected to a computer such as a personal computer, and the control gain is changed from the personal computer. As a method of displaying the control amount, the digital data in the motor control device is output as an analog signal by a digital / analog converter and displayed by drawing with a pen recorder or the like.

FIG. 5 is a block diagram showing the configuration of such a conventional digital motor control device.

[0008] The conventional motor control device 101 includes a motor 1
03, the voltage and current applied to the electric motor 103,
Alternatively, the speed of the electric motor 103 or the torque generated by the electric motor 103 is adjusted by changing at least one of the control amounts such as the frequency.

Inside the motor control device 101, a CPU 3 for performing a control operation, a detector 107 for detecting various control amounts of the motor 103, and an analog / digital (A / D) for converting a signal of the detector 107 into a digital signal. ) Converter 1
09 and a serial interface (SIO) 111 for connecting to an external computer such as a personal computer 121.
And a digital / analog (D / A) converter 113 for converting a digital signal into an analog signal in order to output the control amount data to the pen recorder 123 and the like.

The conventional motor control device 101
Then, after the electric motor 103 is installed, at the time of start-up adjustment, first, in order to operate the electric motor 103, the CPU 10
5 detects the control amount of the electric motor 103 through the detector 107 and the analog / digital converter 109, and calculates the electric power supplied to the electric motor 103 to control the speed of the electric motor 103. At this time, at the same time, the control amount data is output to the connected pen recorder 123 via the digital / analog converter 113 and displayed.

When changing the control gain,
The operator monitors the control amount displayed on the pen recorder 123 and inputs a changed value to the personal computer 121 so as to obtain a desired control gain. The input change value is input from the personal computer 121 to the motor control device 101 through the serial interface 111, and the CPU 10
5, the control gain is changed.

Therefore, the conventional motor control device 101
In order to start up and make adjustments, a personal computer 121 and a pen recorder 123 are required.

Incidentally, since at least a display is usually connected to the personal computer 121, various data can be displayed. Therefore, the function of the pen recorder 123 may be substituted by the personal computer 121 in the conventional motor control device 101.

When the control amount of the electric motor 103 is displayed on the personal computer 121, the conventional electric motor control device 101 sends a request command containing information on which control amount is desired from the personal computer 121 to the electric motor control device 101, In response to the request command, the apparatus 1 transmits an answer command including the current control amount data to the personal computer 12.
This is done by returning to 1.

For example, when displaying four types of control amounts on the personal computer 121, a total of four request commands are sent to the motor control device 101, and the motor control device 101 transmits a total of four answer commands corresponding to the request commands. Will return.

[0016]

However, the conventional configuration requires a high-speed serial interface for connection with a personal computer, especially when trying to adjust a high-speed control system. Then, it is necessary to replace the CPU used in the motor control device for outputting data with a high-speed CPU.

For example, when four types of control amounts are to be displayed on a personal computer as described above, about 16 bits of data are required as a request command for reading out one type of control amount data. Therefore, to read four types of control amounts, 64-bit data is required.
For this reason, in order to display the required control amount on the personal computer, it is necessary to transmit a total of 64 bits of data as a request command from the personal computer to the motor control device each time. Therefore, a high-speed interface and CPU are required.

However, such an interface for reading data and the speeding up of the CPU are other uses in view of the function of the original motor control device, that is, the speed or torque control of the motor. In addition, since this function is necessary only at the time of startup adjustment, adopting such a high-speed serial interface or CPU undesirably leads to an extra cost increase due to its original function.

The present invention has been made in view of the above,
The goal is to increase product costs,
It is an object of the present invention to provide a motor control device that enables adjustment of various set values in startup adjustment or the like using only a personal computer.

[0020]

According to the first aspect of the present invention,
In order to solve the above problem, a motor control device that adjusts the speed of the motor or the torque generated by the motor by controlling at least one of a voltage, a current, and a frequency applied to the motor is provided with a current control to an external device. A control amount registration unit for registering a control amount that needs to be output in order to display the control amount, and a registration for outputting the control amount registered in the control amount registration unit irrespective of an instruction from the external device And a data output unit.

According to the present invention, when a control amount is displayed on an external device, the control amount to be displayed on the external device is registered in the control amount registration means, and the registered data output means receives an instruction from the outside. Can output the data of the registered control amount independently, eliminating the need to specify the data to be displayed on the external device every time, and shortening the time required for transmitting and receiving and updating the displayed data. It is something to try.

According to a second aspect of the present invention, in the electric motor control device according to the first aspect, the control amount registering means comprises a plurality of data tables, and the plurality of data tables are included in the registered control amounts. The gist is that at least one is different from each other.

According to the present invention, as a control amount registering means, a plurality of data tables are provided, and a set of control amounts is registered in the plurality of data tables such that at least one of the control amounts registered therein is different from each other. Aside,
Even if a set of control amounts different from each other is requested by switching the data table, each time the set of control amounts to be displayed is switched, the control amount to be displayed is prevented from being designated, and control is performed to an external device. It attempts to reduce the time it takes to display the quantity.

The third aspect of the present invention is the first or second aspect.
In the motor control device described above, the gist is that the control amount registration means registers a control amount once requested from an external device.

According to the present invention, the control amount to be registered in the control amount registering means is a control amount once requested by an external device, so that registration is not wasted. It is intended to be able to display the registered control amount without a request.

The invention according to claim 4 is the invention according to claim 1 or 2
In the electric motor control device described above, the gist is that the control amount registering means registers a predetermined control amount.

According to the present invention, when the control amount to be registered in the control amount registration means is determined in advance, the control amount can be displayed on an external device even if there is no external request at all.
It is intended to display these control amounts.

[0028]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) FIG. 1 is a block diagram showing a motor control device according to the present invention.

The motor control device 1 includes a CPU 11 for performing a control operation, a memory 13 for storing a data table for registering a control amount to be output to the personal computer 121, and a detector 17 for detecting various control amounts of the motor 103. And an analog / digital (A / D) converter 19 for converting a signal of the detector 17 into a digital signal, and a serial interface (SIO) 21 for connecting to an external computer such as a personal computer 121.

Here, components other than the memory 13, that is, the detector 17, the analog / digital converter 19, and the serial interface 21 have the same functions as those used in the conventional motor control device.

As shown in FIG. 2, the data table 31 stored in the memory 13 indicates that the control amount of the electric motor 103 depends on the type, for example, control amount A, control amount B, control amount C, control amount D,. It is registered.

The control amount registered in the data table 31 is registered when the CPU 11 receives a request from the personal computer 121 for the first time. Therefore, for the control amount once requested, data of the control amount such as current, voltage, frequency, speed, etc., which changes every moment, is registered in the data table 31 thereafter. In addition, when there is a request for a control amount that has not been registered, the requested control amount is registered each time.

Then, the CPU 11 transmits the data of the control amount registered in the data table 31 to the personal computer 1.
21 irrespective of the request from the personal computer 12
Even if there is no request from the control unit 1, the data is output to the personal computer 121 via the serial interface 21 at regular time intervals or when there is a change in the control amount data.

Next, the operation of the thus configured first embodiment will be described.

In the first embodiment, first,
A request command for reading a desired control amount is sent from the personal computer 121. Here, it is assumed that four types of control amounts are requested as in the case of the prior art. Therefore, to specify one type of control amount, 1
The request command of 6 bits is transmitted, and the data of the request command of 4 types and 64 bits is transmitted to the motor control device 1.

Then, the CPU 11 of the motor control device 1
The data of the four requested control amounts are registered in the data table 31. Thereafter, the registered four types of data are detected by the detector 17, and the registration is constantly updated through the analog / digital converter 19.

The data registered in the data table 31 is transmitted to the personal computer via the serial interface 21 at regular time intervals or whenever the value of the data changes, regardless of the presence or absence of a request command from the personal computer 121. Output to 121.

Note that the personal computer 121 displays the transmitted control amount data. Only when the control amount data to be displayed is not transmitted, a request command for requesting the control amount is transmitted to the motor control. It is good to transmit to apparatus 1.

Therefore, it is not necessary to specify data every time as a request command required to display the control amount, so that there is no need to transmit 64-bit data from the personal computer 121. Can be displayed on the personal computer 121 in a short time. As a result, the control amount can be displayed in real time by the personal computer 121.

(Second Embodiment) The second embodiment differs from the first embodiment only in the contents of the data table stored in the memory 13 in the motor control device 1. The configuration of the motor control device 1 itself is the same as that of the first embodiment. Therefore, description of the configuration of the motor control device 1 will be omitted.

FIG. 3 is a diagram showing a data table according to a second embodiment to which the present invention is applied.

In the second embodiment, the personal computer 121
The data table for registering the control amount to be output to the data table has two data tables 31 and 33.

The operation of the second embodiment will be described.

In recent personal computers, it is possible to simultaneously open a plurality of screens (referred to as multi-window) and execute a plurality of applications simultaneously (or pseudo-simultaneously) (referred to as multi-task).

Therefore, in the second embodiment, in response to such a multi-window or multi-task,
According to each window or task, a different control amount can be displayed in each window or task.

For example, when there is one data table, in a multi-window or multi-task, if different types of control amounts are displayed for each window or task, one data table is displayed each time the window or task is switched in a time-division manner. The control amount registered in the table differs from the control amount actually requesting display. For this reason, at the time of switching, a request command is sent to the motor control device 1 as a request for a new control amount, and there arises an inconvenience that the control amount must be reregistered every time a window or a task is switched.

Therefore, in order to avoid such inconvenience, the second embodiment has two data tables, and controls the amount of control displayed on one window or one task for one window or one task. Is registered as a set of control amounts corresponding to each window or each task.

For this reason, as shown in FIG. 3, the control amount A, the control amount C, and the control amount D are registered in the data table 31 so as to correspond to the display of one certain window or task. In addition, the control amount B and the control amount C are registered in the data table 33 so as to correspond to the display of another window or task.

In the second embodiment,
When a window or a task is switched in the personal computer 121, a command indicating the switching is transmitted to the motor control device 1, and the data table 31 or 33 used by the CPU 11 of the motor control device 1 is transmitted by the switching command. Switch.

Thus, even in a multi-window or multi-task, data can be displayed on the personal computer 121 in a short time and in real time for each window or task.

The switching command sent from the personal computer 121 is not complicated as in the case of designating a control amount, and therefore may be a very short command. For example, in the second embodiment, since two screens are switched, the data table can be switched if a 1-bit command is transmitted when the switching occurs. Therefore, the transmission time of the switching command is very short, and does not affect the display of the control amount data.

In the second embodiment, 2
Although the configuration is based on the multi-window of the screen or the multi-task of two tasks, it is needless to say that the data tables may be registered for a plurality of windows and tasks corresponding to more windows and tasks. As a result, similarly to the second embodiment, it is possible to display the control amount data in a short time for each of a plurality of windows and tasks. However, even when there are multiple windows and tasks, if the set of control amounts to be displayed in the multiple windows and tasks is exactly the same, the same set of control amounts is requested without using multiple data tables. One data table may be used for the window or task being executed.

In the second embodiment, the description has been made on the assumption that the multi-window and the multi-task executed by one personal computer are supported. However, the present invention is not limited to this, and for example, one motor control device may be used. When connecting a plurality of personal computers to display different control amounts on each personal computer, similarly to the second embodiment,
By preparing a data table corresponding to each personal computer, the control amount can be displayed in real time on each personal computer.

(Third Embodiment) The third embodiment differs from the first embodiment only in the contents of the data table stored in the memory 13 in the motor control device 1. The configuration of the motor control device 1 itself is the same as that of the first embodiment. Therefore, description of the configuration of the motor control device 1 will be omitted.

FIG. 4 is a diagram showing a data table according to the third embodiment to which the present invention is applied.

In the third embodiment, the personal computer 121
It has data tables 41 and 43 in which the control amounts to be output to and registered in advance are registered.

The operation of the third embodiment will be described.

The control amount data to be displayed on the personal computer 121 during the start-up adjustment of the motor control device 1 is normally determined to some extent. For example, when adjusting the current control system, the current control system can be adjusted by displaying the current of the electric motor 103. When adjusting the speed control system, if the speed of the motor 103 and the current of the motor 103 can be displayed, the speed control system can be adjusted. Therefore, which control amount is displayed depends on which control system is adjusted.

Therefore, in the third embodiment, the memory 13 in the motor control device 1 has data tables 41 and 43 in which a set of control amounts that need to be displayed for each control system to be adjusted is registered. I did it.

Here, the data table 41 is a data table in which only the current values necessary for adjusting the current control system are registered. The data table 43 is used for adjusting the speed control system. Is a data table in which is registered.

As a result, in the third embodiment, it is not necessary to register a control amount in response to a request from the personal computer 121 from the beginning.
If the data output from the motor control device 1 is simply displayed, the data can be displayed in real time. Thus, even the time for transmitting the first request command can be reduced.

The switching of the data tables 41 and 43 may be performed, for example, by the CPU 11 of the motor control device 1 in accordance with a control system to be adjusted, or by transmitting a switching signal from the personal computer 121 side. Is also good. Even when the command of the switching signal is transmitted from the personal computer 121, only the control system is switched, so that only a very short command need be transmitted. Therefore, even when the control system to be adjusted is switched, the transmission time of the switching command is very short and does not affect the display of the control amount data.

In the third embodiment, according to the control system to be adjusted, as shown in FIG. 4, a data table 41 in which only current values are registered, and a data table 41 in which speed and current values are registered are stored. Although the table 43 is shown, these are naturally determined and registered in advance according to various control systems and control amounts that need to be displayed, and are not limited to the illustrated case. Absent.

[0065]

As described above, according to the present invention,
In the motor control device, the control amount required at the time of startup adjustment can be displayed on a personal computer in real time, and another display such as a pen recorder can be dispensed with.

According to the present invention, a set of exclusive control amounts is registered in a plurality of data tables, for example, for each multi-window, multitask, or control system to be adjusted, and the data tables are switched. Multi-window, multi-task, or display corresponding to each control system to be adjusted can be performed in real time.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a motor control device according to the present invention.

FIG. 2 is a drawing showing a data table registered in the electric motor control device in the first embodiment.

FIG. 3 is a drawing showing a data table registered in the electric motor control device in the second embodiment.

FIG. 4 is a diagram showing a data table registered in the electric motor control device in the third embodiment.

FIG. 5 is a block diagram showing a configuration of a conventional motor control device.

[Explanation of symbols]

 Reference Signs List 1 motor control device 11 CPU 13 memory 17 detector 19 analog / digital converter 21 serial interface 31, 33, 41, 43 data table 101 motor control device 103 motor 107 detector 107 analog / digital converter 111 serial interface 113 digital / Analog converter 121 Personal computer 123 Pen recorder

Claims (4)

[Claims] 1. A motor control device for controlling at least one of a voltage, a current, and a frequency applied to a motor to adjust a speed of the motor or a torque generated by the motor. Control amount registering means for registering a control amount required to be output in order to display the control amount, and registered data output for outputting the control amount registered in the control amount registering means irrespective of an instruction from the external device. Means, and a motor control device comprising: 2. The control amount registration unit according to claim 1, wherein the control amount registration unit includes a plurality of data tables, and the plurality of data tables are different from each other in at least one of the registered control amounts. Motor control device. 3. The motor control device according to claim 1, wherein the control amount registration unit registers a control amount once requested from an external device. 4. The control amount registration means according to claim 1, wherein said control amount registration means registers a predetermined control amount.
Or the motor control device according to 2.