
6181-CCBCBZZZZ A-B Control Unit
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IN STOCK6181-CCBCBZZZZ A-B Control Unit
At its core, a VFD converts fixed incoming AC power to a variable-frequency AC output through a series of power electronics stages. First, a rectifier (typically a diode or thyristor bridge) converts the incoming AC to DC. Next, a DC link – consisting of capacitors (and sometimes inductors) – smooths and stores the DC power. Finally, an inverter built from high-speed switching transistors (IGBTs or MOSFETs) converts the DC back to AC at the desired frequency and voltage, using pulse-width modulation (PWM) to create a sinusoidal output waveform . In essence, the VFD synthesizes a new AC waveform of adjustable frequency. A built-in microprocessor controls the inverter switching pulses to implement different motor control algorithms – from simple volts-per-hertz (V/Hz) control to advanced vector control or even direct torque control. This gives excellent regulation of motor speed and torque, even under varying loads or at low speeds.
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