As for the use of vector-operated motors, it can be divided into two categories, namely non-reactive vector control (SVC) and reactive vector control (FVC). Vectorless Handling (SVC): Due to the speed response, additional equipment for the encoder is installed in the motor dragged by the inverter, which is cumbersome. Through the discussion, the inverter planning technical engineers here understand the technical parameters of the motor in advance, even if they only need to detect the terminal voltage and working current of the motor, they can calculate the magnetic flux and angular velocity of the motor rotor, and then calculate the required torque current signal command iT* and excitation current signal command iM*, so as to realize the vector control intention of non-responsive signal.
(FVC) has a response vector control, and an encoder is installed on its shaft, and the encoder will detect the running speed of the motor anytime and anywhere, and send it to the signal input of the control circuit. Responsive vector manipulation has much better mechanical torque characteristics than reactive vector manipulation. Therefore, the torque dynamic response ability of the inverter with response vector control is inferior.
1) As can be seen from the above block diagram, for the inverter, given the signal processing, the inverter simulates the decomposition of the given signal into two rotating DC magnetic field signals that are straight to each other in the control circuit. The separation is called the weight iT* and the torque weight iM*.
2) Carry out equivalent circuit replacement, according to the technical parameters of the three-phase AC asynchronous motor, carry out a series of equivalent changes to the DC magnetic field signals that rotate straight to each other, and make them the control signals iA*, iB*, and iC* for the control of the three-phase inverter. When a given signal changes, the torque weight component of the DC magnetic field is adjusted, and then the speed regulation characteristics similar to those of the DC motor are obtained.
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