What is the difference between a frequency converter and a servo controller?
The speed of an asynchronous motor is =60f/p.f, the frequency of alternating current, P is the pole, and the logarithm.60 is the number of seconds in a minute. As can be seen from the form, the number of poles has been fixed. The speed of the asynchronous motor is proportional to the frequency of the power supply. The frequency of the asynchronous motor is changed by changing the frequency of the power supply. This is the principle of variable frequency speed regulation
Servo motor servomotorAutomatic control of micro motor actuator device used for. Executive motor. Its function is to convert electrical signals into angular or angular velocities of rotating shafts.Servo motors are divided into two categories: DC and dc. AC servo motors work in the same way as AC induction motors. Wf excitation winding and control winding WcoWf is connected to a constant AC voltage of two phase space displacement electric angle of 90 degrees on the stator, the change of Wc on AC voltage or phase is applied to achieve the purpose of running motor control. AC servo motor with stable operation, good controllability, fast response, high sensitivity and mechanical properties and nonlinear adjustment characteristic index (strict requirements are less than 10% and less than 15% ~ 15% ~ 25%) etc.. The principle of DC servo motor is the same as that of general DC motor. The motor speed is n
The inverter is actually an inverter. It is the first AC into DC. And then use the electronic element to switch DC power into AC inverter. In general. Large power SCR. And an adjustable frequency. The device can be adjusted in a certain range of frequency is used to control the motor speed. The speed can be adjusted. In a certain range. The inverter is widely used in AC motor speed.Frequency conversion motor and AC motor is not very different, but the high-frequency loss of materials used is small. Ordinary AC motors can also be frequency conversion speed regulation
Servo system: 1 servo drives in the premise of the development of frequency conversion technology, the current loop in the internal drive, speed loop and position loop (inverter without the ring) of algorithm operation and control technology is more accurate than the general frequency, but also in the function than the traditional servo many powerful, the main point can accurate position control. To control the speed and position of the pulse sequence controller sends the (of course there are also some integrated servo control unit or by bus communication way directly to set the parameters of position and velocity in the drive), drive the internal algorithm and faster and more accurate calculation and better performance of electronic devices to be more superior to converter. 2, motor servo motor of the material, structure and machining process is much higher than that of the AC motor drive inverter (general AC motor or constant torque, constant power and other types of motor), that is to say when the power driver output current and voltage and frequency change quickly, the servo motor can generate action response according to the change power changes, response and anti overload capacity is much higher than that of AC motor inverter drive motor, fundamental serious differences is two different performance. That is to say, not the inverter can not change the power supply signal, but the motor itself can not respond, so in the frequency of the internal algorithm settings, in order to protect the motor to do the corresponding overload settings. Of course, even if the output power of the inverter is not limited, some high-performance inverters can directly drive the servo motor!
Frequency conversion technology: simple frequency converter can only adjust the speed of AC motor. At this time, it can be opened or closed loop. It depends on the control mode and frequency converter. This is the traditional V/F control mode. Now many of the inverter has been through the establishment of a mathematical model of AC motor, the stator magnetic field UVW3 phase into two current can control the motor speed and torque components of the inverter can now most famous brand of torque control are used in such a way to control the torque of each phase, UVW output current detection device Jiamoer the effect of sampling current feedback constitute a closed-loop negative feedback loop PID regulator; it can not only control the speed of the motor can also control the motor torque and speed control accuracy is better than v/f control, encoder feedback can also be added or not, and when the control precision and the response is much better.
