The technology of PLC/DCS system module controller FOXBORO FBM214 itself draws on and applies frequency conversion technology, which is achieved by imitating the control method of DC motors through frequency conversion PWM based on the servo control of DC motors. This means that AC servo motors inevitably have a frequency conversion process: frequency conversion is the process of rectifying 50 and 60Hz AC power into DC power, Then, various types of transistors (IGBT, IGCT, etc.) that can control the gate are used to modulate the inverter into a frequency adjustable waveform similar to sine cosine pulsating current through carrier frequency and PWM. Due to the frequency being adjustable, the speed of the AC motor can be adjusted (n=60f/p, n speed, f frequency, p pole number).

 

The difference between the FBM214 Foxboro FOXBORO controller and the FBM214 FOXBORO controller is:

1. The overload capacity is different, and servo drives generally have a capacity of 3 times the overload, which can be used to overcome the inertia torque of inertia loads at the moment of startup, while frequency converters generally allow 1.5 times the overload.

2. Control accuracy. The control accuracy of servo systems is much higher than that of frequency conversion, and usually the control accuracy of servo motors is guaranteed by the rotary encoder at the rear end of the motor shaft. Some servo systems even achieve control accuracy of 1:1000.

3. Different application scenarios. Variable frequency control and servo control are two categories of control. The former belongs to the field of transmission control, while the latter belongs to the field of motion control. One is to meet the requirements of general industrial applications and pursue low cost in applications with low performance requirements. The other is to pursue high precision, high performance, and high response.

 

 

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