FBM214 Foxboro FOXBORO Controller, Shanghai Sijian Intelligent Technology Co., Ltd. is engaged in technical development, technical consultation, technical transfer in the fields of intelligent technology, information technology, and automation technology, as well as the sales of electrical equipment, automation equipment, electronic products, communication products, and electromechanical products. Industrial automation products include: PLC, DCS, sensors, frequency converters, encoders, relays, servo drives, soft starters, and touch screens. Brands involved in the products include: Eurotherm, Schneider, Siemens, ABB, SICK, P+F, E+H, Yokogawa, Yamakawa, Mitsubishi, Emerson, Honeywell, FANUC, GE, Eaton Electrical, CT.
FBM214 Foxboro FOXBORO Controller, the technology of AC servo itself draws on and applies frequency conversion technology. Based on the servo control of DC motors, it mimics the control method of DC motors through the PWM method of frequency conversion. In other words, AC servo motors inevitably involve the process of frequency conversion: frequency conversion involves first rectifying the AC power at 50 or 60 Hz into DC power, and then using various transistors with controllable gates (such as IGBT, IGCT, etc.) to invert it into an adjustable frequency waveform similar to a pulsating current resembling sine and cosine waves through carrier frequency and PWM modulation. Since the frequency is adjustable, the speed of the AC motor can be adjusted (n = 60f/p, where n is speed, f is frequency, and p is the number of pole pairs).
The differences between the two are:
1. Overload capacity: Servo drives generally have a 3x overload capacity, which can be used to overcome the inertial torque of inertial loads at the moment of startup, while frequency converters generally allow only 1.5x overload.
2. Control accuracy: The control accuracy of servo systems far exceeds that of frequency conversion. Typically, the control accuracy of servo motors is ensured by the rotary encoder at the rear end of the motor shaft. Some servo systems even achieve a control accuracy of 1:1000.
3. Application scenarios: Frequency conversion control and servo control belong to two different control categories. The former falls under the field of transmission control, while the latter belongs to motion control. One meets the requirements of general industrial applications with low performance demands and pursues low cost, while the other pursues high precision, high performance, and high responsiveness.