JPH06113580A - Monitor for motor drive - Google Patents

Abstract

PURPOSE:To facilitate maintenance and inspection by sampling achievement data at a wide period, extracting effective data from collected data and preserving while compressing, analyzing the data thus preserved at an arbitrary span and displaying the data thus analyzed. CONSTITUTION:A data collector 2 counts internal clocks upto a set period and reads in achievement data at the timing of count up. Sampled data is stored in an achievement data table 8 while being classified depending on the data type. Every time when sampling of data corresponding in number with a set table size is finished, an achievement data operating section 9 operates a maximum value, a minimum value, and an average value for each data table unit and stores the operation results on an operation result memory table(AT) 10. When data corresponding with a predetermined time is stored in the AT 10, a data compressing section 11 compresses data and stores the data thus compressed in a magnetic disc 7. The data is captured at an arbitrary time unit and analyzed and the data thus analyzed is displayed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor drive device, and more particularly to a motor drive monitoring device for maintaining a motor.

[0002]

2. Description of the Related Art In the case of a digital type motor drive device which has become mainstream in recent years, the rotational speed of an electric motor is controlled at a cycle of several msec.
There are some that display a graph in a very short time of about several hundred msec based on the actual data in units of c, which was effective for data analysis at the time of an accident. Generally, when performing maintenance on an electric motor of a large facility such as a main motor of a steel line, check the tendency of the electric motor and check the motor status during operation that is not recorded by a drive device other than at the time of an accident. For later confirmation, actual data such as electric current, voltage, and torque of the electric motor are always collected using a chart recorder or the like.

[0003]

In the case of the motor drive device as described above, it cannot be used for daily maintenance and inspection purposes such as observing trends in electric motor numerical values over a long period of several days to several years, and a chart type is used. Since there is no effective means other than outputting with the recorder, it was necessary to move the recorder for 24 hours, and humans had to maintain it by supplying recording paper.

An object of the present invention is to have an effective analysis / display device which can confirm the tendency of various numerical values of the electric motor at the time of daily maintenance and inspection in order to solve the above problems and replace the chart type recorder. It is to provide an electric motor drive monitoring device.

[0005]

According to the present invention, there is provided a data sampling function for periodically collecting predetermined control information of an electric motor drive circuit for driving an electric motor, and control information for predetermined cycle time of the data sampling function. Separately, a clock integration function that sets the period from milliseconds to months, an information collection device consisting of this clock integration function and data sampling function, and a record of storing and accumulating control information integrated by the clock integration function. The data table, the performance data calculation unit that calculates the maximum value, the minimum value, and the average value of the control information accumulated in this performance data table, and the maximum value, the minimum value, and the average value calculated by this performance data calculation unit. The calculation result memory table to be stored and the maximum value, minimum value and A data compression unit for compressing and reducing a mean value to a predetermined size to obtain compressed data, and an information processing device including the data compression unit, a performance data table, a performance data operation unit, and an operation result memory table. A magnetic disk storage device for storing the compressed data compressed by the data compression unit, a data extraction unit for extracting a specified time data by designating a time from the compressed data stored in the magnetic disk storage device, A data decompression unit that decompresses the specified time data obtained by the data extraction unit to obtain decompression data, a performance data analysis unit that analyzes the decompression data obtained by this data decompression unit to obtain analysis data, and this performance data The display data for the display is calculated using the analysis data obtained by the analysis unit to obtain the graph display signal. A graph display calculation unit, a data analysis device including the graph display calculation unit, a data extraction unit, a data decompression unit, and a performance data analysis unit, and a graph display signal output from the graph display calculation unit for maintenance of the motor. An electric motor drive monitoring device including a maintenance tool for displaying instructions for the operation.

[0006]

In the motor drive monitoring device according to the present invention,
Predetermine control information of the motor drive circuit that drives the motor is periodically collected, and the cycle time of the data sampling function is set for each predetermined control information in the period from millisecond unit to month unit. The accumulated control information is stored and accumulated, and the maximum value, the minimum value and the average value of the control information accumulated in the actual data table are calculated,
Compressed data that stores the maximum value, minimum value, and average value calculated by the performance data calculation unit, compresses the maximum value, minimum value, and average value stored in the calculation result memory table to a predetermined size and reduces it. Then, the compressed data compressed by the data compression unit is saved, the specified time data is extracted by specifying the time from the compressed data saved in the magnetic disk storage device, and the specified time data obtained by the data extraction unit Is decompressed to be decompressed data, the decompressed data obtained by the data decompression unit is analyzed as analysis data, the display points for display are calculated using the analysis data obtained by the actual data analysis unit, and the graph An instruction for maintenance of the electric motor is displayed by the graph display signal output from the display calculation unit.

[0007]

EXAMPLE An example of the present invention will be described below. In FIG. 1, 2a is a data sampling function that periodically collects predetermined control information of an electric motor drive circuit that drives an electric motor, and 2b is a control time of the data sampling function 2a. Clock integration function to set the period up to the unit, 2 is the clock integration function 2
b, an information collecting device including a data sampling function 2a, 8 is a performance data table for storing and accumulating the control information integrated by the clock integration function 2b, and 9 is a maximum value of the control information accumulated in the performance data table 8. ,
Achievement data calculator that calculates the minimum and average values, 10
Is a calculation result memory table that stores the maximum value, the minimum value, and the average value calculated by the performance data calculation unit 9, 1
1 is the maximum value stored in the calculation result memory table 10,
The data compression unit 3 that compresses the minimum value and the average value to a predetermined size and reduces the compressed data to obtain compressed data is composed of the data compression unit 11, the actual data table 8, the actual data operation unit 9, and the operation result memory table 10. An information processing device configured, a magnetic disk storage device 7 for storing the compressed data compressed by the data compression unit 11,
Reference numeral 5 is a data extraction unit that specifies time from the compressed data stored in the magnetic disk storage device 7 and extracts specified time data, and 16 is decompressed and decompressed specified time data obtained by the data extraction unit 15. Data decompression unit,
Reference numeral 17 is a result data analysis unit that analyzes the decompressed data obtained by the data decompression unit 16 to obtain analysis data, and 18 uses the analysis data obtained by the result data analysis unit 17 to calculate display points for display. A graph display calculation unit 1 for obtaining a graph display signal
8, a data extraction unit 15, a data decompression unit 16, and an actual data analysis unit 17, and a data analysis device 12 displays an instruction for maintenance of an electric motor by a graph display signal output from a graph display calculation unit 18. It is a maintenance tool that can be used as a maintenance tool. , Based on the data processing device that extracts effective data from the collected data and compresses the data, the storage device that stores the compressed data, and the data that is stored in the storage device,
A motor drive device characterized by comprising a data analysis device for capturing and analyzing data in arbitrary time units from minutes / seconds to several months, and a display device for displaying the analyzed data.

That is, in order to achieve the above-mentioned object, the present invention aims to maintain and inspect the electric motor, and
Various motor control values such as voltage and torque for a few msec
From a data collection device that can sample actual data in a wide cycle of about several hours, a data processing device that extracts valid data from the collected data and compresses the data, and a storage device that stores the compressed data, Based on the data stored in the storage device, the motor drive device has a data analysis device that captures and analyzes in arbitrary time units from minutes / seconds to several months, and a display device that displays the analyzed data. By preparing for the above, it is possible to always collect various data during operation of the electric motor and analyze the tendency of the electric motor and display the result as a graph at any time. 2 shows a block diagram of sampling the actual value of the electric motor and writing it in the magnetic disk device 7, and FIG.
Shows a block diagram until arbitrary data is extracted from the collected actual data and displayed as a graph.

First, in the data collection device 2, the internal clock is counted up to a set cycle and the actual data is read at the timing of counting up. Since the digital motor drive device originally performs speed control and tension control by sampling for several msec, the data used in this control is used as it is when sampling the actual data. Next, the sampled data is stored in the performance data table 8 for each data type. The size N of the table at this time is 600 words for 1 min in the case of sampling for 100 msec. Every time the sampling of the number of data for the set table size is completed, the maximum value, the minimum value and the average value are calculated in each data table unit by the actual data calculation unit 9 and the result is stored in the next calculation result memory. Store to table 10. The size M of the calculation result memory table 10 is expressed by the following equation.

M = type of data × 60 (= 1h) × 3
(MIN, MAX, AVE) At this time, in order to reduce the memory size, the range of one kind of data is set to ± 4000 from the resolution on the electric motor control, and one word data may be divided into eight data and stored. It is possible. In this way, when one hour's worth of data is accumulated in the calculation result memory table 10, the data compression unit 11 further compresses the data to reduce the size and then writes and stores it in the magnetic disk 7. . At this time, the size of the data to be written on the magnetic disk 7 is 4 kinds of the actual data, such as voltage, current, tension and RMS.
If the type and the data compression rate are ⅓, the data size per hour is M / 3/8 kW, and the data size per day is 4 × 60 × 3/3/8 = 0.72 kb 100 MB magnetic disk 7 is used. The actual data memory period in the case of doing is 1000 / 0.72 / 365 = 3.8 (year).

To take out the data stored in the magnetic disk 7 as described above, first, the maintenance tool 12 is connected to the motor drive device 1, and a target time and a unit for analyzing the data are input.

Next, the extracted record calculation unit 14 determines the number of records of the target time from the time difference between the current time and the target time input by the setting data input unit 13 from the data accumulated in 1-hour units. The data is extracted and the data extraction unit 15 extracts the data at the required time. Next, the data decompression unit 16 decompresses the extracted data, and the actual data analysis unit 17
The data extracted by the unit of data analysis input by the setting data input unit 13 is picked up, and the graph display calculation unit 18
Calculate the display points for graph display with
Display on the maintenance tool 12.

[0013]

EFFECTS OF THE INVENTION A data collecting device capable of sampling performance data such as electric current, voltage, and torque of the electric motor in a wide cycle of several msec to several hours for the purpose of maintenance and inspection of the electric motor, From the data processing device that extracts valid data from the collected data and further compresses the data, the storage device that saves the compressed data, and the data stored in the memory device By including a data analysis device that captures and analyzes data in arbitrary spans up to several months, and a display device that displays the analyzed data, various data during the operation of the motor is constantly collected and pasted in arbitrary time units. It is possible to display various data at any time on a graph, eliminating the troublesome maintenance such as recording paper replenishment when using a chart recorder, Protect the tendency of the numerical values of the electric motor can be easily confirmed at the time of inspection.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an electric motor drive monitoring device according to an embodiment of the present invention.

FIG. 2 is a block diagram of the data analysis device shown in FIG.

[Explanation of symbols]

 2 ... Data collection device 3 ... Data processing device 5 ... Data analysis device 6 ... Data display device 8 ... Actual data table 9 ... Actual data operation unit 10 ... Operation result memory table 11 ... Data compression unit 12 ... Maintenance tool 15 ... Data extraction Part 16 ... Data decompression part 17 ... Actual data analysis part 18 ... Graph display calculation part

Claims (1)

[Claims] 1. A data sampling function for periodically collecting predetermined control information of an electric motor drive circuit for driving an electric motor, and a cycle time of the data sampling function for each of the predetermined control information in units of milliseconds to months. To a period of up to a clock integration function, an information collecting device consisting of the clock integration function and the data sampling function, a record data table for storing and accumulating the control information integrated by the clock integration function,
A performance data calculation unit that calculates the maximum value, the minimum value, and the average value of the control information accumulated in the performance data table, and the maximum value, the minimum value, and the average value that are calculated by the performance data calculation unit are stored. A calculation result memory table, a data compression unit that compresses and reduces the maximum value, the minimum value, and the average value stored in the calculation result memory table to a predetermined size, and this data compression unit, An information processing device including the result data table, the result data operation unit, and the operation result memory table, a magnetic disk storage device that stores the compressed data compressed by the data compression unit, and the magnetic disk storage device. A data extraction that extracts the specified time data by specifying the time from the compressed data stored in the device. Section, a data decompression section that decompresses the specified time data obtained by the data extraction section to decompress data, and an actual data analysis that analyzes the decompressed data obtained by the data decompression section to obtain analysis data Section, a graph display calculation section for calculating a display point for display by using the analysis data obtained by the performance data analysis section to obtain a graph display signal, the graph display calculation section and the data extraction section, A data analysis device including the data decompression unit and the result data analysis unit, and a maintenance tool that displays an instruction for maintenance of the electric motor by the graph display signal output from the graph display calculation unit. An electric motor drive monitoring device.