Manufacturers & Exporters of:   Solid State Welders Vacuum Tube HF Welder IGBT Type Solid State Welder Digital DC Drives Digital AC Drives Servo Drives PLC Control panels Custom Built Control Panels APFC Panels Motion Control System MCC/PCC Panels HT/LT Distribution Panels PLC SCADA HMI
Manufacturers & Exporters of:  Solid State & Vacuum Tube HF Welders, IGBT Type Solid State Welder, Digital DC & AC Drives, Servo Drives, Custom Built PLC Control Panels, HT/LT Distribution Panels

AC Drive (Variable frequency drive)

Sai Automation provide AC Drive panels for motor control application with complete accessories and devices such as Mains switch, MCCB, Input-Output chokes, VFDs of various makes such as ABB, Siemens, Mitsubishi, Schneider, Danfoss and other make as per customer choice. We not only provide excellent quality and workmanship but also provide service support to customers by way of designing the operation and service manual.


An AC drive is a device that is used to control the speed of an electrical motor, either an induction motor or a synchronous motor. AC drives are also known by various other names such as adjustable speed drives (ASD) or adjustable frequency drives (AFD) or variable frequency drives (VFD) or variable speed drives (VSD) or frequency converters (FC).

The speed is controlled by changing the frequency of the electrical supply to the motor. The 3-phase voltage in the national electrical grid connected to a motor creates a rotating magnetic field in the motor. The rotor of the electrical motor follows this rotating magnetic field. An AC drive converts the frequency of the network to anything from 0 up to 300 Hz or even higher, and thus controls the speed of the motor in proportion to the frequency.

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