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The future development trend of the servo motor industry

Release time：

2022-04-03 00:00

After the modern AC servo system has undergone the change from analog to digital, its internal digital control loop has been ubiquitous, such as commutation, current, speed and position control, etc.; its realization is mainly through new power semiconductor devices, such as high Functional DSP plus FPGA, and even servo-specific modules are also commonplace. And new power devices or modules will be updated every 2 to 2.5 years, and new software algorithms will also change with each passing day. The servo products of international manufacturers will also be updated every 5 years. In short, the product life cycle is getting shorter and shorter. , the changes are getting faster and faster. Summarizing the technical roads and product roads of servo manufacturers at home and abroad, and considering the changes in market demand, we can see the latest development trends of servo motor systems as follows:

high efficiency

Although high efficiency has always been the primary development topic of 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 function of the permanent magnet material and the excellent structure design 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 movement, and the regeneration system. motion 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. Because the transmission error of the base mechanical transmission device is eliminated, high speed and high positioning accuracy are realized. The characteristics of linear motors that are easy to change shape can realize the miniaturization and light weight of various equipment using linear linear structure.

High speed, high precision, high functionality

Using higher-precision encoders, higher sampling accuracy and data bits, faster DSP, high-performance rotary motors and linear motors without cogging, and 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, feedback, control, drive, and communication became an open direction for low-power servo systems at that time. Sometimes we call this kind of motor integrated with drive and communication intelligent motor, and sometimes we call the drive integrated with motion control and communication intelligent servo drive. The integration of motor, drive and control makes the three more closely integrated from planning, 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 mainstream, and it is a small and characteristic part of the entire servo market.

Universal

The general-purpose driver is equipped with many parameters and rich menu functions, which is convenient for users to set up V/F control, sensorless open-loop vector control, closed-loop magnetic flux vector control, permanent magnet control without changing the hardware configuration. Brushless AC servo motor control and regeneration unit and other five working methods, suitable for various occasions, can drive different types of motors, such as asynchronous motors, permanent magnet synchronous motors, brushless DC motors, stepping motors, and can also be used Different sensor types and even no orientation sensors. The response equipped with the motor itself can be used to form a semi-closed-loop control system, or a high-precision full-closed-loop control system can be formed with an external position or speed or torque sensor through the interface.

intelligent

Modern AC servo drives have the functions of parameter recall, fault self-diagnosis and analysis. 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. Combining control functions such as electronic gears, electronic cams, synchronous tracking, and interpolation motions with drives provides an extraordinary solution for servo users.