How does the Servo driver drive the servo motor?

2021-11-03 10:32:29 jact_elec

How does the Servo driver drive the servo motor?

Servo driver is also called "servo controller" or "servo amplifier". Its working principle is a controller used to control servo motors. Its function is similar to that of a frequency converter acting on an ordinary AC motor. It is a part of the servo system and is mainly used For high-precision positioning system. Generally, the servo motor is controlled by three methods of position, speed and torque to achieve high-precision transmission system positioning. It is currently a high-end product of transmission technology.

Is it driven by amplifying the pulse signal sent by the plc?

 It is not a simple amplification, the PLC output is only a square wave, and the driver output is a sine wave. It can be understood that the pulse of the PLC is the work instruction of the Servo driver, which is like the work instruction of the leader. The servo driver is for the leader to do the work. The leader requires the office to do so, and the office must use its own brains.

The servo drive can be understood as an AC power supply that can satisfy the work of the servo motor. When it drives the servo motor, it does not directly amplify the pulses of the PLC but understands what these pulses do, and then simulates the output of the sine wave through the PWM method. Control the work of the servo motor.

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Generally, PLC pulses are PLS pulses, which are square waves with a fixed pulse width and interval. The number of square waves can be understood as "step", which means that the servo motor has to take "one step" (that is, rotating How many angles), so the more pulse square waves, the more angles the servo motor rotates, so the servo drive needs to output the waveform of how many angles the servo motor can rotate, but the servo motor cannot be like a stepper motor. It is done by the simple motor structure. It needs a position loop to make a closed loop, that is, the pulse of the encoder measures how much the current motor angle has changed, and then the output voltage and output frequency are adjusted through PID.

That is, the Servo driver should compare the received PLC pulse with the encoder pulse fed back from the motor (it can be simply understood as subtraction), and then output a value after PID calculation, and then give it to the so-called speed loop and current loop. Calculate, finally control the IGBT module by PWM means, output a certain square wave to simulate the sine wave to control the speed of the servo motor to meet the angular position it needs to rotate to. From the perspective of the bottom layer, the control of the Servo driver is similar to that of the vector inverter.

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