With the wide application of servo motors in the industry, the design and research of high dynamic performance servo drives and servo motors will become a hot spot in domestic research. At the same time, how to improve the dynamic characteristics of servo motors has become an urgent need to be solved. The problem.
The performance indicators of the servo system in the dynamic adjustment process are called dynamic performance indicators, such as overshoot, follow speed, following accuracy, adjustment time, anti-interference ability and so on.
The servo system was first applied to the military and aerospace fields. With the footsteps of industrialization, it gradually entered the industrial field and the civilian field. In the production practice, the application of the servo system has been very extensive.
1. In CNC machine tools, the use of high-end permanent magnet AC servo instead of asynchronous variable frequency drive seems to have become the standard. Since the 1990s, European and American countries have been committed to the development and application of high-speed CNC machine tools. At the same resolution, the feed rate of the workbench has been greatly improved. Today's CNC system tools are characterized by high speed, high precision, high dynamics and high rigidity. We have already seen the application of domestic servos on economical CNC machine tools, but the domestic servos on medium and high-end machine tools still can't meet the requirements. Performance is an important aspect. Stability and brand effect are also obstacles that cannot be crossed in a short time.
2. Robots are also a field in which servo systems are widely used. Industrial robots have multiple degrees of freedom. Therefore, each industrial robot requires 3-4 servo motors and more than 10 servo motors. At present, the number of industrial robots has exceeded 1 million, and the annual demand is still increasing substantially. Most of the international industrial robot giants have their own dedicated servo packages. In recent years, domestic servo manufacturers have begun to enter the robot industry, although there is still a big gap in performance.
3. The proportion of servo application in the textile industry is very low. In order to improve production efficiency, some textile machinery began to adopt high-end servo technology, but almost all imported brands are used. The price factor has caused the servo system to be widely used in the textile industry. If the domestic servo maintains the price advantage and improves the product performance, it will greatly promote the development of the entire industry.
In addition, printing machinery, packaging machinery, medical equipment, metallurgical machinery, automated assembly lines, etc. have a great demand for servo systems. From this, we can also see the importance of improving the performance of the servo system for the development of various industries. In addition to the price factor, buyers mainly pay attention to the servo motor:
1. Dynamic response is fast, dynamic response is an important dynamic performance indicator of the servo system, requiring the system to follow a given fast, overshoot, or even no overshoot.
2. High precision, the accuracy of the servo system refers to the accuracy of the output following the given value, such as precision machine tools, requiring high positioning accuracy.
3. Strong anti-disturbance ability, the system output dynamic change is small under various disturbances, and the recovery time is fast.
4. Industry-related solutions, such as electronic cam, chasing, flying shears and other control technology applications
The servo system is mainly composed of two parts: servo motor and driver. The drive acts as a command component in the control system and the servo motor acts as an actuator in the control system, both of which are an important part of the control system. The dynamic performance of the servo system depends to a large extent on these two parts. Among them, the response bandwidth is an important indicator to measure the dynamic performance. The higher the bandwidth, the stronger the ability of the servo system to follow the input command, and the better the dynamic performance.
The test method for the servo drive speed loop bandwidth is specified in "General Technical Conditions for AC Servo Drives" (JB T 10184-2000): the drive inputs a sine wave speed command, the amplitude of which is 0.01 times the rated speed command value, and the frequency is gradually increased from 1 Hz. When it is raised, the corresponding speed curve of the motor is recorded. As the sinusoidal frequency of the command increases, the phase lag of the motor speed waveform gradually increases with respect to the command sine wave curve, and the amplitude gradually decreases. The frequency at which the phase lag is increased to 90 degrees is taken as the frequency bandwidth of the phase shift of the servo system by 90 degrees; the frequency at which the amplitude is reduced to 0.707 times at the low frequency is taken as the servo system-3 dB bandwidth.
Bandwidth scan waveform
Zhiyuan electronic MPT motor test platform can not only test the voltage and current, TN curve and other tests of the driver and motor, but also has the original "free loading engine" technology to provide solutions for the response of the servo system and the bandwidth. MotorTest software's user-friendly user interface is powerful and can provide customized services. The MPT test system meets the industry's requirements for motor control steady-state and transient measurement, leading the motor test into the servo era.
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