The stator flux orientation control method for induction motor drive system has been reported in some literatures, while few literatures record the stator flux orientation control method for induction motor drive system. That is why?
Stator flux oriented control is not quite popular as the rotor flux field oriented control mainly due to the following reasons.
1. The d-axis and q-axis dynamics are not completely decoupled in stator flux orientation. Thus the stator flux is dependent on both the d-axis and q-axis quantities. Similarly even when the stator flux is held constant, the torque dynamics still depends on both the q-axis and d-axis stator current. Therefore, additional decoupling networks are required to cancel out the effect of cross coupling dependencies. But the decoupling networks are themselves parameter sensitive, especially to rotor time constant.
2. Even with correct decoupling networks, stator flux orientation has a pull out torque limitation. Here, the torque per flux squared cannot exceed a certain value depending on the leakage factor. A machine with a higher leakage inductance tends to have a low value of pull out torque in stator flux oriented control. But in rotor flux orientation, there is no such limitation.
While the relative ease of stator flux estimation compared to rotor flux estimation is an advantage, the estimation tends to be erroneous at lower speeds. Another advantage is that speed feedback is not required in these drives when operated in torque control mode.
The book by Kwang Hee Nam on AC motor control and Electric Vehicle Applications is a decent description on this topic.
I agree with Jose Titus
In Stator, the torque per flux squared cannot exceed a certain value depending on the leakage factor due to the low value of pull out torque. In rotor flux orientation, there is no such limitation.
Jose Titus I want to know if this method can be applied from the practical view.
Dear Wang Huimin, I am aware of at least one place where it was applied for an axial cable winder drive that only required torque control. But that was commissioned long back. So I think it is indeed practical. But nowadays due to easy availability of digital platforms with great computation power, I think people have moved to rotor flux orientation mostly.
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