#but generally three-phase induction motors are preferred as the most economical.

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Delta drives are microprocessor-based motor drives, widely used to control speed of industrial AC motors.

An AC drive is a device used to control the speed of an electrical motor in order to: enhance process control. reduce energy usage and generate energy efficiently. decrease mechanical stress on motor control applications. optimize the operation of various applications relying on electric motors

Delta connected motor will draw more line current, so the torque it produces will also be higher compared to the Star connection of the same motor. So the answer to this question is Delta connection.

A variable frequency drive (VFD) refers to AC drives only and a variable speed drive (VSD) refers to either AC Drives or DC Drives. VFDs vary the speed of an AC motor by varying the frequency to the motor. VSDs referring to DC motors vary the speed by varying the voltage to the motor.

AC motor. The AC electric motor used in a VFD system is usually a three-phase induction motor. Some types of single-phase motors or synchronous motors can be advantageous in some situations, but generally three-phase induction motors are preferred as the most economical.

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