Contents
What is the DQ axis?
The DQ axes are shown rotating with angular velocity equal to , the same angular velocity as the phase voltages and currents. The D axis makes an angle with the phase A winding which has been chosen as the reference. The currents and. are constant dc quantities.
Which current is used in induction motor?
An AC motor is an electric motor driven by an alternating current (AC). The AC motor commonly consists of two basic parts, an outside stator having coils supplied with alternating current to produce a rotating magnetic field, and an inside rotor attached to the output shaft producing a second rotating magnetic field.
What is flux linkage in induction motor?
Vector control of alternating current motors In this method the rotor flux linkages are obtained from the rotor voltage equations using the information on the stator currents and the rotor speed. The rotor flux linkages can be directly obtained from the following rotor voltage equations as. (5.45)
What is a DQ model?
dq or space-vector modeling: In the dq frame, the inductance parameters become constant, independent of position.
What is DQ theory?
1 Synchronous reference frame control. Synchronous reference frame control is also called dq-control. It converts grid voltage and current into a frame that rotates synchronously with the grid voltage vector by Park Transformation so that three-phase time-varying signals are transformed into DC signals.
Why is the DQ frame used?
The fundamental reason to transform the three-phase instantaneous voltages and currents into the synchronously rotating reference dqo frame is to make computations much easier. Secondly, it allows the system operator to independently control the active (d-axis) and reactive (q-axis) components of the currents.
How is direct torque control of induction motor simulated?
In this experiment, a sensorless speed control of an induction motor using direct torque control (DTC) will be simulated. The dq motor model developed in the previous experiment will be used for this as well. The estimator model and the switching algorithm will be modified to implement DTC.
Can a DQ motor be used for DTC?
The dq motor model developed in the previous experiment will be used for this as well. The estimator model and the switching algorithm will be modified to implement DTC. In addition to simulation, the controller will be evaluated on an actual induction motor in real-time.
How does a DQ model of a machine work?
Because it utilizes space vectors, the dq model of the machine provides a powerful physical interpretation of the interactions taking place in the production of voltages and torques, and, more importantly, it leads to the ready adaptation of positional- or speed-control strategies such as vector control and direct torque control.
How to model an induction machine using phase variables?
The first step in the mathematical modeling of an induction machine is by describing it as coupled stator and rotor three-phase circuits using phase variables, namely stator currents i as, i bs, i cs and rotor currents i ar, i br, i cr ; in addition to the rotor speed ω m and the angular displacement θ between stator and rotor windings.