Matrix Automation

Dabri, Delhi

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Avariable-frequency drive (VFD)is a system for controlling the rotational speed of analternating current(AC)electric motorby controlling the frequency of the electrical power supplied to the motor.A variable frequency drive is a specific type ofadjustable-speed drive. Variable-frequency drives are also known as adjustable-frequency drives (AFD), variable-speed drives (VSD), AC drives, micro drives or inverter drives. Most AC Drives can be classified according to one of the following five broad categories

• Variable-voltage inverter (VVI) or 'six-step' drives
• Voltage-source inverter (VSI) drives
• Current-source inverter (CSI) drives
• Cyclo-converter or matrix drives
• Load commutated inverter (LCI) drives

In a basic VVI drive, the DC output of the SCR-bridge converter is smoothed via capacitor bus and series-reactor connection to supply via Darlington Pair or IGBT inverter quasi-sinusoidal, six-step voltage input to the motor. In a basic VSI drive, the DC output of the diode-bridge converter stores energy in the capacitor bus to supply stiff voltage input to the inverter. In a basic CSI drive, the DC output of the SCR-bridge converter stores energy in series-reactor connection to supply stiff current input to the inverter. A Cyclo-converter or matrix drive has no AC-to-DC converter and instead connects each output terminal to the appropriate input phase, making up the desired variable-frequency output waveforms by selective commutation from the fixed-frequency input waveforms. In a basic LCI drive, the DC output of the SCR-bridge converter stores energy via DC link inductor circuit to supply stiff quasi-sinusoidal six-step current input to a second SCR-bridge's inverter and an over-excited synchronous machine. Most packaged AC Drives are VSI-PWM type using pulse width modulation to control the motor's frequency in one of a number of operating modes including open-loop Volts-per-Hertz control, field-oriented control (FOC), closed-loop speed control with slip compensation, or direct torque control (DTC), PWM not however being needed or typically used with DTC. AC Drives are also often categorized as to torque and power characteristics in terms of the following three main motor load types

• Variable torque load type, such as in fan, pump and blower applications
• Constant torque load type, such as in conveyor and displacement pump applications
• Constant power load type, such as in machine tool and traction applications