Pak Se Yang, a researcher at the Science Engineering Institute, has proposed a new control technique to realize the maximum torque per ampere (MTPA) in direct torque control (DTC) of a permanent magnetic synchronous motor (PMSM).
Because MTPA condition is provided by the relation between d-axis and q-axis components of the stator current, rotor position has to be known for frame conversion. Therefore, he chose to employ the estimation method of rotor position for realization of MTPA.
For the sake of rotor position estimation, he formulated the recursive least square problem for online estimation of back electro-magnetic force by using a motor model based on the rotational reference frame, and then determined the rotor position. In order to minimize the torque ripple of conventional DTC system, he synthesized the 3 phase output voltages by using the space vector pulse width modulation (PWM) technique.
His paper was presented in the “10th International Conference on Advanced Technologies”.
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