DTC is a direct torque control method, which uses the torque directly as a controlled variable. Its essence is to use the space vector analysis method to control the stator flux and electromagnetic rotation using the stator magnetic field orientation method. moment is directly controlled. This method does not require complex coordinate transformation, but directly calculates the magnitude of the flux linkage and torque on the motor stator coordinates, and achieves PWM pulse width modulation and high dynamic performance of the system through direct tracking of the flux linkage and torque. .
Direct torque control technology uses the space vector analysis method to directly calculate and control the torque of the motor in the stator coordinate system, using the stator magnetic field orientation, with the help of discrete two-point adjustment (Band-Band ) generates a PWM wave signal to directly optimally control the switching state of the inverter to obtain high dynamic performance of torque. It eliminates the need for complex vector transformation and simplified processing of the mathematical model of the motor, without the usual PWM signal generator. Its control idea is novel, the control structure is simple, the control means are direct, and the physical concept of signal processing is clear. Direct torque control also has obvious disadvantages: torque and flux pulsation. In view of its shortcomings, the current direct torque control technology has been greatly improved compared to the early direct torque control technology