CN100468476C - real-time measuring system of motor driver - Google Patents

Abstract

The invention relates to a real-time measuring system of a motor driver, which comprises a Digital Signal Processor (DSP), a data acquisition module, a data processing module and a data processing module, wherein the DSP digitizes the operation data of the motor driver and outputs the measured measuring data; the interface circuit is connected with the digital signal processor and used for receiving the measurement data output by the digital signal processor; a conversion device connected to the interface circuit for converting the first signal corresponding to the first communication port into the second signal corresponding to the second communication port; and a terminal processing device for analyzing and processing the input measurement data by a programming interface and synchronously displaying the measurement data, wherein the terminal processing device is provided with a window interface, and when the terminal processing device finds that the received data is decoded incorrectly, the wrong data point is marked on the window interface, and the next data is continuously displayed. So as to achieve real-time and continuous measurement of the operation data of the motor driver.

Description

Real-time measurement system for motor drives

technical field

The invention relates to a real-time measurement system, which is applied to measure the operation data of a motor drive, in particular to a real-time measurement system of a motor drive.

Background technique

In recent years, countries around the world have invested a lot of manpower, material resources, time and money in the research of motors, hoping to improve the level of industrial technology and make them widely used in automation industry, semiconductor manufacturing process, machine tools, handling, etc. The control of the motor will be limited by the switching speed of the power electronic components in the motor driver and the computing speed of the computer microprocessor, and it is impossible to make a breakthrough in the control of the entire system, so it encounters a technical bottleneck. Until the last ten years, the rapid development of the semiconductor industry and the breakthrough of power electronics in high power have made it easier to drive high-power motors. In addition to the smaller size of the motor driver, better performance, and improved efficiency, Moreover, due to the increasingly fast operation of computer microprocessors and the maturity of single-chip microcomputer application technology, the amount of data processed is also increasing, making many control theories come true. At present, various academic circles and research units have actively studied The motor driver is put into research, and the research on the peripheral system of the motor driver is even more important.

In use, in order to achieve certain working purposes of the motor device and the motor driver, some parameters of the motor driver, such as voltage and current, or its rotational speed, need to be adjusted. For the convenience of parameter adjustment, in the process of designing the motor driver, the measured physical quantity of the motor driver will be output in an analog or digital way. The most common way is to connect the output terminal to an oscilloscope to monitor the operation of the motor and obtain Know whether the overall motor system meets the desired work requirements.

Please refer to FIG. 1 , which is a measurement system of a known first motor driver. A motor driver 10 is connected to a motor device 20 , and the output data signal of the motor driver 10 is connected to an oscilloscope 30 , and the operation of the motor driver 10 is displayed on the oscilloscope 30 . The motor driver 10 provides analog terminals, and the user can check the output signal through the oscilloscope 30 to know whether the motor driver 10 has reached the set situation in operation. However, the oscilloscope 30 is an expensive industrial instrument, and it is difficult to operate In-depth study is also required. More importantly, the oscilloscope 30 is quite bulky and has a very precise interior, which is not suitable for being widely used in general factories for measurement.

Referring to FIG. 2 again, it is a measurement system of a known second motor driver. In this measurement system of a motor driver, a motor driver 11 is connected to a motor device 21, and the output data of the motor driver 11 is connected to a computer device 41 by means of a serial communication port (RS232) 31, and is sent by the computer device 41. A trigger signal is given to the motor driver 11, and the program in the motor driver 11 starts to capture the data, and stores it in a temporary storage 51. When the temporary storage 51 is full, the computer device 41 sends a check command, and the data is started by The motor driver 11 sends back the data, because the speed of the serial communication port 31 is 115200bit/s, and the data needs to be stored in the temporary memory 51 first, so the time of returning will be delayed (delay), so that all The measured data loses its real-time effect.

Contents of the invention

Therefore, how to provide a real-time and practical motor driver measurement system and return data to a processing device in a faster transmission mode has become one of the problems that researchers need to solve and improve.

In view of the defects and unsolvable problems in the prior art, the present invention proposes a real-time measurement system for a motor drive, which includes a digital signal processor (Digital Signal Processor: DSP), digitizes the operation data of the motor drive, and outputs the measured The data received; an interface circuit, connected with the digital signal processor, receives the measurement data output by the digital signal processor; a conversion device, connected with the interface circuit, converts the first signal corresponding to the first communication port into a corresponding The second signal of the second communication port; the last measurement data enters a terminal processing device, the terminal processing device analyzes and processes the input measurement data with a programmed interface and displays the measurement data synchronously, and the terminal processing device has a window interface , and when the terminal processing device finds that the received data is incorrectly decoded, it will mark the wrong data point on the window interface, and continue to display the next data. In this way, the effect of synchronous measurement of the motor driver is achieved, and the measurement data does not need to be displayed by an oscilloscope, which further makes the real-time measurement system of the motor driver of the present invention more practical. Regarding the characteristics and implementation of the present invention, the preferred embodiments are described in detail below in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is the measuring system of known first motor driver;

Fig. 2 is the measurement system of the known second motor driver;

Fig. 3 is the real-time measurement system of the first motor driver of the present invention;

Fig. 4 is the real-time measurement system of the second motor driver of the present invention; And

Fig. 5 is a flow chart of the multi-axis real-time measurement of the motor driver of the present invention.

Wherein, the reference signs are explained as follows:

10 Motor Driver 11 Motor Driver

20 Motor unit 21 Motor unit

30 Oscilloscope 31 Serial communication port

41 Computing device 51 Temporary storage

100 motor drive 150 motor device

200 Digital Signal Processor 300 Interface Circuit

350 High-speed serial communication port 400 Conversion device

450 Universal Serial Bus 500 Terminal Processing Unit

510 Universal Serial Bus slot 550 Cable

600 window interface

Step 501 The terminal processing device detects that it is online with the motor driver

Step 502 The terminal processing device uses the initial time of each axis of the motor driver to automatically synchronize the time of each axis

Step 503 The terminal processing device receives the multi-axis synchronous measurement data sent back by the motor driver

Step 504 Display the measurement data on the window interface

Step 505 Make an error mark on the window interface screen

Detailed ways

Please refer to FIG. 3 , which is a real-time measurement system for a motor driver of the present invention, including a digital signal processor (Digital Signal Processor: DSP) 200, an interface circuit 300, a conversion device 400 and a terminal processing device 500.

Among them, there is a motor driver 100 that is measured in real time. The motor driver 100 is an AC motor driver that controls a motor device 150 in a sine wave pulse width modulation (Pulse Width Modulation: PWM) manner. The motor driver 100 has multiple function keys on it. (not shown), and a display (not shown), can provide the user to set the operating frequency of the motor device 150, display the actual output frequency of the motor device 150, the actual output current of the motor device 150, and the user-defined unit parameters Browse, modify settings, lock parameters, display abnormal faults, and perform functions such as running, stopping, resetting, forward running, reverse running, inching, etc.

There is a digital signal processor (Digital Signal Processor: DSP) 200 inside the motor driver 100, which is responsible for digitizing the parameters set by the motor driver 100 and the actual data of the operation, and outputting the measured measurement data. The measurement data is a Digital signals, therefore, have the advantage of being less susceptible to interference than analog signals in the process of transmission.

In response to various protocols for data transmission, an interface circuit 300 is therefore required to operate. Therefore, the digital signal output by the digital signal processor 200 can be transmitted into a high-speed serial communication port 350 through an interface circuit 300, and the transmission speed of the high-speed serial communication port 350 reaches the transmission speed of a general serial communication port of 115200bit /s more than ten times.

One end of a conversion device 400 is connected to the interface circuit 300, and the other end is connected to the terminal processing device 500, the first communication port is connected to the interface circuit 300 and the second communication port is connected to the terminal processing device 500, and the conversion device 400 is used to meet the first The first signal of the communication port is converted into the second signal corresponding to the second communication port. In one embodiment, the first communication port of the external output of some motor drivers 100 adopts a serial communication port (RS232) transmission interface, however, some newer terminal processing devices 500 or palm-sized information processing devices do not have a serial communication port. Serial communication port (RS232) interface for serial connection, moreover, the transmission speed of serial communication port (RS232) is 115200bit/s, even if the speed of high-speed serial communication port is ten times higher than 115200bit/s, but Still not as fast as using Universal Serial Bus (USB) 450. Therefore, the conversion device 400 provides specification conversion between the first communication port and the second communication port. In one embodiment, the first communication port is the high-speed serial communication port 350 , and the second communication port is the USB 450 . The above list is only to illustrate the communication ports that the switching device 400 can switch, and is not intended to limit the forms of the first communication port and the second communication port. There is a high speed serial communication port (high speed RS232) in the conversion device 400 to convert the chip of universal serial bus (USB), if the converted universal serial bus 450 is USB1.1 standard, then the transfer rate is 12Mb/s, If it is a USB2.0 specification, the transmission rate is 480Mb/s, which is quite sufficient for the communication bandwidth of real-time transmission.

The terminal processing device 500 is a computer system, but it can also be some palm-sized information processing systems. There is a universal serial bus slot 510 on the terminal processing device 500, which is used by the universal serial bus 450 connected by the conversion device 400. The terminal The processing device 500 displays a software-based window interface 600 through a display device (not shown), and the software-based window interface 600 is connected to the motor driver 100 to display the parameter data of multiple motor drivers 100 through the window interface 600. , the displayed data is displayed with multiple sets of window systems, so the user can monitor the operation of the motor driver 100 at the same time. If there is any abnormality in the operation, the motor driver 100 will also display a warning signal to remind the user to pay attention and make an appropriate circuit. Protection measures, of course, if the well-written window interface 600 program is used, the user can not only monitor the operation status of the motor driver 100, but also allow the window interface 600 program to have the function of automatically adjusting appropriate parameters, and the window interface 600 can be used in multiple applications. Under the shaft window, different parameters of the motor driver 100 are displayed. The terminal processing device 500 accepts data data continuously in one direction, and there is no additional burden on the digital signal processor 200. When the terminal processing device 500 finds that the received data data is translated If there is an error in the code, it will not re-request the transmission of data with the motor driver 100. It will only mark the wrong data point on the screen and continue to display the next data. Therefore, on the multi-axis joint display, it will not re-do. Multi-axis time synchronization, so there will be no delay in signal input, and a more rigorous guarantee for the accuracy of measurement data. In addition, the present invention does not need to pre-plan a temporary memory in the motor driver 100 as a buffer for data transmission. The built-in program of the motor driver 100 uses the time period to actively send the measurement data that the user wants to view, so the number of measurement data There is a certain proportional relationship with time, so the number of data points of the measurement data has a certain proportional relationship with time, so that the motor driver 100 can be measured in real time.

Please refer to FIG. 4, which is the second embodiment of the real-time measurement system of the motor driver of the present invention. This embodiment considers that some motor drivers 100 do not have a built-in conversion device 400, so a method of installing the conversion device 400 on Outside the motor driver 100 , one end of the conversion device 400 is connected to the high-speed serial communication port 350 of the motor driver 100 through a connection line 550 , and the other end is connected to the terminal processing device 500 through a connection line 450 . Please refer to FIG. 5 , which is a flow chart of the multi-axis real-time detection of the motor driver of the present invention. At the beginning of starting the motor device and the motor driver, in step 501, the terminal processing device detects that it is connected to the motor driver, and in step 502, the terminal processing device will use the initial time of the motor driver for each axis to convert the time Automatic synchronization, then step 503, the terminal processing device receives the multi-axis synchronization measurement data returned by the motor driver, if the measurement data is decoded correctly, then enters step 504, and displays the measurement data on the window interface, if the terminal processing device If it is found that the data is wrongly decoded, then proceed to step 505, and make an error mark on the window interface screen.

Although the present invention is disclosed above with the aforementioned preferred embodiments, they are not intended to limit the present invention. Those skilled in the art can make some changes and modifications without departing from the spirit and scope of the present invention.

Claims (9)

1, a kind of real-time measurement system of motor driver includes:

One digital signal processor, the operational data of this motor driver of digitizing, and export an above measurement data;

One interface circuit connects this digital signal processor, receives this measurement data by this digital signal processor output;

One conversion equipment, to be connected in this interface circuit, first conversion of signals that will meet one first PORT COM is the secondary signal that meets one second PORT COM; It is characterized in that: also include

One terminal processes device, this measurement data of input is also shown this measurement data synchronously with a programmatic interface analyzing and processing, this terminal processes device has a window interface, and when this terminal processes device is found the data information decoding error of reception, can on window interface, indicate wrong data point, and continue to show the next record data information.

2, real-time measurement system according to claim 1 wherein is built in this motor driver in this conversion equipment.

3, real-time measurement system according to claim 1, wherein this conversion equipment is external in this motor driver by a connecting line.

4, real-time measurement system according to claim 1, wherein this first PORT COM is a high speed serial communication port.

5, real-time measurement system according to claim 1, wherein this second PORT COM is a USB (universal serial bus).

6, real-time measurement system according to claim 5, wherein this USB (universal serial bus) is the USB1.1 specification of transfer rate.

7, real-time measurement system according to claim 5, wherein this USB (universal serial bus) is the USB2.0 specification of transfer rate.

8, real-time measurement system according to claim 1, wherein this programmatic interface utilizes multiaxis to show described measurement data.

9, real-time measurement system according to claim 1, wherein this measurement data is a digital signal.

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