Introduction to Synchronous servo drive

2021-11-03 10:34:51 jact_elec

Introduction to Synchronous servo drive

Synchronous Servo Drive, also known as a "servo controller" and a "servo amplifier", is a controller used to control servo motors. Its function is similar to that of a frequency converter on a normal AC motor and is part of a servo system. Mainly used for high precision positioning system.

Usually, the servo motor is controlled by position, speed and torque in order to achieve high precision positioning of the transmission system. It is a relatively high-end product in the current transmission technology.

Synchronous servo drive is an important part of modern motion control. It is widely used in automation equipment, such as industrial robots and CNC machining centers. In particular, the Synchronous servo drive, which is used to control AC permanent magnet Synchronous motors, has become a research hotspot at home and abroad. The current Synchronous servo drive design generally uses the current, speed and position 3 closed-loop control algorithm based on vector control. Whether the speed closed-loop design of the algorithm is reasonable plays a key role in the whole servo control system, especially in the speed control performance.

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At present, the mainstream Synchronous Servo Drive are digital signal processor (DSP) as the control core, which can realize more complex control algorithms, digitization, networking and intelligence. Power equipment usually use intelligent power module (IPM) as the core of the drive circuit. The drive circuit is integrated within the IPM and has fault detection and protection circuits such as overvoltage, overcurrent, overheating and undervoltage. Main circuit also increased the soft start circuit, in order to reduce the influence of the boot process to drive, the power drive unit through the first three phase bridge rectifier circuit for the three-phase power or mains power input rectifier, in order to obtain the corresponding direct current, three-phase ac mains or after rectifying, through the three-phase sine wave PWM voltage inverter variable frequency drive three-phase permanent magnet synchronous ac servo motor. The whole process of the power drive unit can be simply described as AC-DC-AC process. The main topological circuit of the rectifier unit (AC-DC) is the three-phase full-bridge uncontrolled rectifier circuit.

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