Get Speed Tracking Of Indirect Field Oriented Control Induction Motor Using ... - Eprints Uthm Edu

The basic DTC scheme is more suitable in the small and medium power range applications. Conversely, FOC can directly control the current and therefore the input current of the motor contains fewer harmonics compared to the DTC technique. Lower harmonic content of the FOC leads to better efficiency.

Abstract: Indirect Field Oriented Control (IFOC) is known to produce high performance in induction Motor (IM) drives by decoupling rotor flux and torque producing current components of stator current.

The speed control of a three phase induction motor is obtained by changing the supply voltage until the torque required by the load is developed at the desired speed. The torque developed by the induction motor is directly proportional to the square of the supply voltage and the current is proportional to the voltage.

Advantages of Field-Oriented Control As the space vector control algorithms used for FOC are implemented more efficiently and low-cost microcontrollers have more processing power, the technique can be used for lower performance induction motor drives.

In classical FOC, a PI controller is designed to control the speed of the induction motor drive. It induces many problems like more rise time, settling time, overshoot, under shoot, steady state error etc., oscillation of speed and torque due to sudden changes in load and external disturbances [1].

higher top speed and, often just as importantly, higher motor drive efficiency. Motor controllers which adopt an FOC approach can drive the motor more efficiently, as high as 97 % in certain applications. This advantage is particularly pronounced at higher speeds.

Field-Oriented Control (FOC), also known as vector control, is a technique used to control Permanent Magnet Synchronous Motor (PMSM) and AC induction motors (ACIM). FOC provides good control capability over the full torque and speed ranges.

FOC is a control scheme for induction motors in which a d-q coordinates reference frame locked to the motor flux space vector is used to achieve decoupling between the motor flux and torque. Consequently, they can be separately controlled by the stator direct-axis and quadrature-axis currents, respectively.