In terms of frequency converters:
The abbreviated inverter can only regulate the speed of the communication motor, and the open-loop or closed-loop can be determined depending on the control method and the inverter, which is the traditional V/F control method. Now many of the frequency conversion has been established by the mathematical model, the stator magnetic field UVW3 phase of the communication motor is converted into the weight of the two currents that can control the speed and torque of the motor, and now most of the famous brands of frequency converters that can be used for torque control are selected to control the torque in this way, and the output of each phase of UVW should be added to the current detection equipment of the Moore effect, and the PID conditioning of the current loop of the current loop with a closed-loop negative response after sampling reaction; AFSEN's inverter also proposes a direct torque control skill that is different from this method. In this way, both the speed of the motor and the torque of the motor can be controlled, and the control accuracy of the speed is better than that of V/F control, and the encoder response can also be added or not, and the control accuracy and response characteristics of the time division are much better.
Motor:
The data, structure and processing skills of the servo motor are much higher than that of the communication motor driven by the inverter (general communication motor or constant torque, constant power and other types of inverter motors), that is to say, when the driver outputs the power supply with rapid current, voltage and frequency change, the servo motor can produce a change in action according to the change of power supply, and the echo characteristics and anti-overload can be much higher than that of the communication motor driven by the inverter, and the difference between the motor is also the basis for the different functions of the two. That is to say, it is not that the frequency conversion output cannot change the power signal so quickly, but that the motor itself cannot respond, so the corresponding overload setting is made in order to maintain the motor when the internal algorithm of the frequency conversion is set. Of course, even if the output capacity of the inverter is not set, there are some inverters with excellent functions that can directly drive the servo motor.
In terms of servo drives:
Under the premise of carrying out the frequency conversion skills, the servo drive has carried out more accurate control skills and algorithm operations than the general frequency conversion in the current loop, speed loop and azimuth ring (the frequency converter does not have this ring) inside the drive, and it is much more powerful than the traditional servo in terms of function, and the main point can be accurate azimuth control. The speed and azimuth are controlled by the pulse train sent by the upper controller (of course, there are also some servos that integrate the control unit or directly set the parameters such as azimuth and speed in the drive through bus communication), and the algorithm inside the drive and faster and more accurate calculations and better performance of the electronic devices make it superior to the inverter.
An important difference between servo and inverter is:
Frequency conversion can be without encoders, servo must have encoders, for electronic commutation, the skill of communication servo itself is to learn and apply the skills of frequency conversion, on the basis of the servo control of the DC motor through the PWM mode of frequency conversion to imitate the control mode of the DC motor to achieve, that is to say, the communication servo motor must have this link of frequency conversion: PLC data frequency conversion is to rectify the communication power of the power frequency of 50 and 60HZ into direct current, and then through various transistors (IGBT, IGCT, etc.) is inverted into a frequency-adjustable waveform after carrier frequency and PWM conditioning, similar to the pulsating electricity of sine and Cosine, because the frequency is adjustable, so the speed of the communication motor is adjustable (n=60f/2p, n speed, f frequency, p-pole pair).
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