Modern AC servo drives have undergone the transition from imitation to digitalization, and their internal digital control loops are now ubiquitous, such as phase conversion, current, speed and azimuth control, which are ultimately mainly through new power semiconductor devices. New software algorithms will also change quickly. Servo products from international manufacturers will also be updated every 5 years. Product life cycles will be shorter and faster. Summarize the technology and product path of domestic and foreign servo manufacturers, and contact the change of market demand. The following new open trends in servomotor systems can be seen:
1, high speed, high precision, high practicability
Choose higher precision encoder, sampling accuracy and data bit is higher, DSP speed is faster, no coiling effect high-power rotary motor, linear motor, and the use of self-study, artificial intelligence and other modern control strategies, constantly improve the servo driver's basic principles.
2. Intelligence
Modern AC servo drives feature parameter recall, self-diagnosis and analysis. Most servo drives feature load inertial measurement and automatic gain adjustment. Some can automatically identify the parameters of the motor, automatically determine the zero position of the encoder, and some can automatically suppress vibration. The control functions such as electronic gear, electronic CAM, synchronous tracking and interpolation motion are connected with the drive, providing a good way to deal with servo users.
3. Direct drive
The direct drive includes a servo drive of a disk motor turntable and a linear servo drive of a linear motor. After the transmission fault of the basic mechanical transmission equipment is eliminated, the high speed and high positioning accuracy are realized. The simple shape change characteristics of linear motors enable a variety of devices to adopt linear linear organization, complete miniaturization and lightweight.
4. Fusion and fusion
Vertical integration of motor, reverberation, control, drive and communication became the opening direction for low-power servo drives at the time. Sometimes we refer to this kind of integrated drive and communication called a smart motor as a motor. Sometimes we call this an integrated motion control and communication driven intelligent servo drive. The integration of motors, drives and controllers enables the three to move more closely from planning, manufacturing to operation and maintenance. However, this approach faces greater technical challenges and usage habits of engineers, so it is difficult to become mainstream, and it is a small and distinctive part of all servo motors.
5. Generalize
The common driver has a variety of parameters and rich menu functions. Without changing the hardware configuration, the user can easily set V/F control, speed sensorless open-loop vector control, closed-loop flux vector control, permanent magnet brushless AC servo motor control and regeneration unit and other five operation methods. Suitable for various occasions, can drive different types of operations. Type I motors, such as asynchronous motors, permanent magnet synchronous motors, brushless DC motors, stepper motors, can also be used for different types of sensors, even bearingless sensors. The semi-closed-loop control system can be composed of the response of the motor itself, or it can be composed of a high-precision full closed-loop control system through the interface with external azimuth or speed or torque sensors.