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 is the basic principle of direct torque control method?

Direct Torque Control (DTC) is an optimised AC drives control principle where inverter switching directly controls the motor variables: flux and torque. The measured input values to the DTC control are motor current and voltage. The voltage is defined from the DC-bus voltage and inverter switch positions.

How is torque controlled in an induction motor?

In the DTC, motor torque and flux magnitudes directly controlled with control of stator flux vector. The DTC control algorithm is bases on selecting of the appropriate inverter switching state to directly control stator flux vector’s speed and length that explain why the method is named as DTC.

What is DTC control in drive?

High-performance AC drives from ABB offer an innovative technology called direct torque control (DTC). As the name suggests, the method controls motor flux and torque directly, instead of trying to control motor currents indirectly like AC vector drives and DC drives.

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What is meant by torque control?

A control method that enables the torque generated by a motor to be equal to a torque reference input. Torque control is suitable for tension control of a winding machine and other applications.

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 do you control torque?

Torque Control

  1. Torque can be controlled directly by controlling the armature current. Fig. …
  2. In Fig. 10.8a, a phase-controlled rectifier, in combination with a dc-link filter inductor, can be used to create a variable dc-link current which can be applied directly to the armature terminals of the dc motor.
  3. In Fig.

What does a VFD do?

A variable frequency drive (VFD) is a type of motor controller that drives an electric motor by varying the frequency and voltage of its power supply. The VFD also has the capacity to control ramp-up and ramp-down of the motor during start or stop, respectively.

What forces direct torque?

Torque is a measure of the force that can cause an object to rotate about an axis. Just as force is what causes an object to accelerate in linear kinematics, torque is what causes an object to acquire angular acceleration.

What is FOC motor control?

Vector control, also called field-oriented control (FOC), is a variable-frequency drive (VFD) control method in which the stator currents of a three-phase AC or brushless DC electric motor are identified as two orthogonal components that can be visualized with a vector.

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What is DTC in 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 the two controlling variables in DTC technology?

The controlling variables are motor magnetising flux and motor torque. With DTC there is no modulator and no requirement for a ta- chometer or position encoder to feed back the speed or position of the motor shaft.

What is torque in VFD?

Torque is measured in pound feet (lb-ft). Previously, it was foot pounds (ft-lbs), many still use this older term. Torque expresses how much work is performed, but it doesn’t indicate how quickly that work is completed. Power is the rate at which torque (work) is performed: p = t/time.

What are the types of VFD?

The main three types of VFD are VSI, CSI, and PWM.

  • VSI type VFDs. VSI stands for Voltage-source inverter. This is the most common type of variable frequency driver. …
  • CSI type VFDs. CSI stands for current source inverter. …
  • PWM type VFDs. This is an improved and modified version of VSI type VFDs.

What do you mean by restoring torque?

The torque which rises to return an object (twisted, rotating, etc.) to its original orientation is the restoring torque.

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