What is direct torque control of induction motor?

Direct torque control (DTC) is an emerging technique for controlling PWM inverter-fed induction motor (IM) drives. It allows the precise and quick control of the IM flux and torque without calling for complex control algorithms. In principle, moreover, it requires only the knowledge of the stator resistance.

What are three main types of control strategies for induction motor drives?

There are three main types of control strategies for induction motor drives: the variable-voltage variable-frequency (VVVF) control, field-oriented control (FOC), and direct torque control (DTC).

Who invented direct torque control?

Later in the 1980s, a new control method for induction machines was introduced: The direct torque control (DTC) method. It was proposed by Takahashi and Depenbrock [1, 2].

How do you control torque in a VFD?

Torque control mode allows for the VFD to directly control motor torque instead of motor speed. This is necessary for any application where torque takes priority over speed. Winder, rewinders, capping, and web applications are some good examples of when torque control is utilized.

How is direct torque control of induction motor improved?

Fuzzy Direct Torque control of induction motor (FDTC) The major reasons for high torque and flux ripples are fixed magnitude hysteresis bands and application of switching vector for complete sample time period. In this section the CDTC is improved using fuzzy logic switching controller (FLSC).

How does Direct Torque Control ( DTC ) work?

Direct torque control (DTC) is one of the method used in variable frequency drives to control the torque (and thus finally the Speed) of three-phase AC electric motors. This involves calculating the estimate of the motor’s magnetic flux and torque based on the measured voltage and current of the motor.

How is FDCC used to improve torque control?

By using FDTC with FDCC torque and flux ripples under steady state are reduced by 90% which is very high compared to previous works. The dynamic response of the drive is improved and smooth stator flux trajectory path is achieved compared to previous works. The proposed scheme is validated using simulation results using Matlab/Simulink Environment.

Which is the best description of fuzzy logic control?

Fuzzy logic control (FLC) is a control algorithm based on a linguistic control strategy which tries to account the human’s knowledge about how to control a system without requiring a mathematical model [11]. The approach of the basic structure of the fuzzy logic controller system is illustrated in Fig.3.