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 dispersed along the rotating magnetic field in a constant amplitude space, 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 connections are similar to those of DC motors.
Also, when standing on the rotor, the magnetic field generated by the stator and the rotor is also a static magnetic field that is scattered in a sinusoidal shape along the space.
Therefore, the types of DC motors and asynchronous motors are fundamentally similar. The same applies to synchronous motors.
Comparison of VIF manipulation with magnetic flux vector manipulation
VF Manipulation The control model is sketchy, and the motor model is not required, only (additional voltage, additional frequency) and origin voltage.
Flux vector manipulation requirements: Know the motor nameplate parameters and adjust yourself to determine the type of motor required for flux vector manipulation.
Through the flux vector control, slip compensation and low-frequency RI compensation can be performed according to the load conditions, and faster accuracy, wider speed range, faster dynamic response, and excellent low-speed function can be achieved.
VF control can only compensate for fixed low-frequency voltages in the low-speed section, and can only compensate for inaccurate manual slip according to the amount of current during operation, so as to achieve static and dynamic drive functions and flux vector control. Possibly. 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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