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In vector control, an AC induction or synchronous motor is controlled under all operating conditions like a separately excited DC motor. [21] That is, the AC motor behaves like a DC motor in which the field flux linkage and armature flux linkage created by the respective field and armature (or torque component) currents are orthogonally aligned such that, when torque is controlled, the field ...
AC VFD AC VFD AC VFD AC VFD Control platform Brush type DC V/Hz control Vector control Vector control Vector control Control criteria Closed-loop Open-loop Open-loop Closed-loop Open-loop w. HFI^ Motor DC IM IM IM Interior PM; Typical speed regulation (%) 0.01: 1: 0.5: 0.01: 0.02 Typical speed range at constant torque (%) 0–100: 10–100: 3 ...
When changing VFD frequency in standard low-performance variable-torque applications using Volt-per-Hertz (V/Hz) control, the AC motor's voltage-to-frequency ratio can be maintained constant, and its power can be varied, between the minimum and maximum operating frequencies up to a base frequency. Constant voltage operation above base frequency ...
Direct torque control (DTC) is one method used in variable-frequency drives to control the torque (and thus finally the speed) of three-phase AC electric motors.This involves calculating an estimate of the motor's magnetic flux and torque based on the measured voltage and current of the motor.
Higher performance load applications are increasingly been been used for AC drives with multi-level and cellular inverter topologies and closed loop and sensorless vector or DTC control. [3]. The expectation is that vector control will eventually universally replace scalar control for AC drives [8].
The scalar control has been to a large degree replaced in high-performance motors by vector control that enables better handling of the transient processes. [1] Low cost and simplicity keeps the scalar control in the majority of low-performance motors, despite inferiority of its dynamic performance; [ 3 ] vector control is expected to become ...
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A motor controller is a device or group of devices that can coordinate in a predetermined manner the performance of an electric motor. [1] A motor controller might include a manual or automatic means for starting and stopping the motor, selecting forward or reverse rotation, selecting and regulating the speed, regulating or limiting the torque, and protecting against overloads and electrical ...