DTC can adapt to motor control technology in various environments
1 Introduction
By matching the speed and torque of the motor to the demand of the driven load, the variable speed drive (VSD) has provided unprecedented performance for the motor, saving a lot of energy. Most VSDs on the market rely on modulation levels. It regulates the voltage and frequency inputs to the motor but creates a congenital delay in the process control signal. In contrast, the excellent ABB drive uses innovative direct torque control (DTC) to greatly enhance the torque response of the motor. Other benefits offered by DTC technology include functionality up to the system level.
The high-performance AC drive offered by ABB offers a technology called Direct Torque Control (DTC). As the name implies, this method directly controls the flux and torque of the motor, rather than attempting to indirectly control the motor current like AC vector and DC drives. This means that the matching accuracy with the load requirements of the driven system is higher. DTC is a founding company of ABB and was patented in the mid-1980s. It eliminates the need for additional modulation stages and therefore achieves control power close to the theoretical maximum.
When ABB introduced its first direct torque control AC drive to the market in 1995, DTC became the leading technology. Subsequent improvements in processor computing power, application programming, and communication interfaces have continued to improve DTC performance, providing high-quality motor control for a wide range of applications.
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