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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 ...
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.
Compared with a multi-speed transmission, the motor is usually operating in its optimal power band for a smaller range of output speeds for the system (e.g., road speeds in the case of a motor vehicle). Direct-drive mechanisms also need a more precise control mechanism.
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 ...
direct on line starter A kind of motor starter that does not reduce the voltage at the motor terminals. direct torque control A method of estimating motor torque as part of a variable speed motor drive. discrete cosine transform A mathematical technique for representing a sampled signal as a sum of cosine waves of different frequencies.
The change in motor starting current from the reduced voltage stage can be minimised by switching at transition to a primary reactor second starting stage. In his patent Max Korndörfer shows an external reactor coil method "so as to make the gradation in voltage between steps" before a changeover to direct-on-line.