Fundamentals of magnetic flux vector manipulation
The control of a three-phase asynchronous motor is much more complicated than that of a DC motor because the current, voltage, induced potential, magnetic flux, etc., of the stator and rotor are all alternating.
However, the stator winding of a three-phase asynchronous motor is a symmetrical three-phase winding, and the current generated after applying a symmetrical three-phase voltage is a symmetrical three-phase current. The magnetic field that occurs in the air gap of the winding and the motor is sinusoidally distributed in a constant amplitude space along the rotating magnetic field, which is determined by the frequency and the number of pole pairs of the winding.
The potential induced by the rotor windings in the air-gap magnetic field and the resulting induced current remain symmetrical and sinusoidal, proportional to the magnetic flux and velocity of the air gap. The electromagnetic torque that occurs is determined by the air gap magnetic flux and the rotor current.
These relationships are similar to those of DC motors.
In addition, when standing on the rotor, the magnetic field that occurs in the stator and rotor is also a static magnetic field that is distributed in a sinusoidal shape along the space.
Therefore, the types of DC motors and asynchronous motors are basically similar. The same applies to synchronous motors.
Comparison of VIF manipulation with magnetic flux vector manipulation
VF Manipulation The control model is simple, and the motor model is not needed, only (additional voltage, additional frequency) and origin voltage.
Flux vector manipulation requires understanding the motor nameplate parameters and adjusting it yourself to confirm the type of motor required for flux vector manipulation.
After the flux vector manipulation, the slip compensation and low-frequency RI compensation can be carried out according to the load situation, and the faster accuracy, wider speed scale, faster dynamic response and excellent low-speed function can be obtained.
VF control can only compensate for a fixed low-frequency voltage in the low-speed section, and can only compensate for inaccurate manual slip depending on the amount of current during operation, and then realize the static and dynamic drive function and magnetic flux vector control. Perhaps. There are some gaps.
However, VF manipulation is suitable for special parameter motors, parallel motors, mismatched motors, relatively special loads, or to further reduce magnetic flux in order to save energy.
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