Vector Control; Torque Control - Salicru CV50-008-4F User Manual

7.3 Vector control

Because asynchronous motors have the characteristics of high stage, nonlinear, strong coupling and various
variables, the actual control of the asynchronous motor is very difficult. Vector control is mainly used to settle
this problem with the theme of that divide the stator current vector into exciting current (the current heft
generating internal magnetic field of the motor) and torque current (the current heft generating torque) by
controlling and measuring the stator current vector according to the principles of beamed magnetic field to
control the range and phase of these two hefts. This method can realize the decoupling of exciting current and
torque current to adjust the high performance of asynchronous motors.
CV50 inverters have embedded sensorless sensor vector control calculation for driving asynchronous motors.
Because the core calculation of vector control is based on exact motor parameter models, the accuracy of
motor parameter will impact on the performance of vector control. It is recommended to input the motor
parameters and carry out autotune before vector running.
Because the vector control calculation is very complicated, high technical theory is needed for the user during
internal autotune. It is recommended to use the specific function parameters in vector control with caution.

7.4 Torque control

CV50 inverters support two kinds of control mode: torque control and rotation speed control. The core of
rotation speed is that the whole control focuses on the stable speed and ensures the setting speed is the
same as the actual running speed. The Max. Load sould be in the range of the torque limit. The core of torque
control is that the whole control focuses on the stable torque and ensures the setting torque is the same as the
actual output torque. At the same time, the output frequency is among the upper limit or the lower limit.
Basic Operation Instruction 87 - 144