Field oriented control of asynchronous machines - having integrator for U delta -Uref, output with I eta subtracted and input to proportional amplifier to give Uref.

摘要

The field-oriented control of induction machines with dynamic evaluation of the necessary steady state stator voltages uses a control system that outputs the desired value of the current vectors in the rotating delta - eta coordinate system. Either a mathematical relationship exists between the angular speed of the rotor flux space vectors relative to the stator a-b coordinate system and the reference angular speed, or in addition there is a mathematical relationship between the rotor speed and the reference angular speed. The difference between U delta and a reference voltage, is integrated with a time constant simulating the machine's sub-transient inductance. The output has I eta subtracted form it portional amplifier whose output is the original reference voltage. ADVANTAGE Improved control strategy.