The future development trend of the servo motor industry
2022-05-28
Modern AC servo systems, after undergoing changes from analog to digital, have their internal digital control loops ubiquitous, such as commutation, current, speed and orientation control, etc.; Functional DSP plus FPGA, and even servo-specific modules are also rudimentary. In addition, new power devices or modules are updated every 2 to 2.5 years, new software algorithms are also changing with each passing day, and the servo products of international manufacturers are also updated about every 5 years. In short, the product life cycle is getting shorter and shorter. , changing faster and faster. Summarizing the technical road and product road of domestic and foreign servo manufacturers, and contacting the changes in market demand, we can see the latest development trends of the following servo motor systems:
high efficiency
Although high efficiency has always been the primary open issue for the servo system, it still needs to be strengthened. It mainly includes the high efficiency of the motor itself: such as the improvement of the performance of permanent magnet materials and the very good structure of the magnet equipment; it also includes the high efficiency of the drive system: including the optimization of the inverter drive circuit, the optimization of the acceleration and deceleration motion, the regeneration system Dynamic and energy response and very good cooling methods etc.
Direct drive
Direct drive includes turntable servo drive using disc motor and linear servo drive using linear motor. Since the transmission error of the base mechanical transmission equipment is eliminated, high speed and high positioning accuracy are achieved. The simple change of the shape of the linear motor can make all kinds of equipment that use the linear linear structure realize the miniaturization and light weight.
High-speed, high-precision, high-performance
The use of higher-precision encoders, higher sampling accuracy and data bits, faster DSP, high-performance rotary motors and linear motors without cogging effects, and the use of various modern control strategies such as self-learning and artificial intelligence, Continuously improve the basic policy of the servo system.
Integration and integration
The vertical integration of motor, response, control, drive, and communication became an opening direction for low-power servo systems at that time. Sometimes we call this kind of motor that integrates drive and communication an intelligent motor, and sometimes we call a drive that integrates motion control and communication an intelligent servo driver. The integration of motors, drives and controls brings the three closer together from planning and manufacturing to operation and maintenance. However, this method faces greater technical challenges and the challenges of engineers' usage habits, so it is difficult to become a mainstream, and it is a small and characteristic part in all servo markets.
Universal
The general-purpose driver is equipped with many parameters and rich menu functions, which is convenient for users to set V/F control, speed sensorless open-loop vector control, closed-loop flux vector control, permanent magnet without changing the hardware configuration. Five operating methods, including brushless AC servo motor control and regeneration unit, are suitable for various occasions and can drive different types of motors, such as asynchronous motors, permanent magnet synchronous motors, brushless DC motors, stepper motors, and can also be used to Different sensor types do not even have an orientation sensor. A semi-closed-loop control system can be formed by using the response provided by the motor itself, or a high-precision full-closed-loop control system can be formed with an external azimuth or speed or torque sensor through the interface.
Intelligent
Modern AC servo drives have parameter recall, fault self-diagnosis and analysis functions. Most drives have load inertia measurement and automatic gain adjustment functions. Some can automatically identify the parameters of the motor and automatically determine the zero position of the encoder. Vibration suppression is performed automatically. Connecting control functions such as electronic gears, electronic cams, synchronous tracking, and interpolation motion with the drive provides a very good solution for servo users.
