Sensorless Direct Torque and Flux Control with Permanent Magnet Synchronous Motors
Direct Torque and Flux Control − What Is It?
The Direct Torque and Flux Control (DTFC) is a control technique developed for three−phase AC permanent magnet synchronous motors. DTFC uses a model of the electric motor flux and torque equations.
Theta Power Systems International (TPSI) built an implementation allowing high−efficiency operation from the very low to the very high−speed range, depending on the specific application. At the same time, it is simple to fine−tune for most applications without deep motor control knowledge.
Onsemi's ECA640A motor controller utilizes Direct Torque & Flux Control (DTFC) firmware from Theta Power Systems International (TPSI) to achieve efficient implementation for fixed-point and floating-point processors. DFTC eliminates the need for physical sensors and has low-speed and high-speed operations that make it ideal for a variety of applications. This white paper discusses how to implement and tune ECA640A with TPSI's DTFC to increase your system's accuracy and reliability. Other features such as scalability, universal control, MTPA, and MPTV are also discussed.