The method of vector control frequency conversion speed regulation is to convert the stator current Ia, Ib, Ic of the asynchronous motor in the three-phase coordinate system through three-phase - two-phase change, which is equivalent to the communication current Ia1Ib1 under the two-phase static coordinate system, and then through the directional rotation and change according to the rotor magnetic field, it is equivalent to the direct current Im1 and It1 under the synchronous rotating coordinate system (Im1 is equivalent to the excitation current of the DC motor; IT1 is equivalent to the armature current proportional to the torque), and then imitate the control method of the DC motor, obtain the control quantity of the DC motor, and complete the control of the asynchronous motor after the corresponding coordinate reversal.
Its essence is to equivalence the communication motor to the DC motor, and the speed and magnetic field weight are controlled independently. After manipulating the rotor flux, and then decomposing the stator current to obtain the two weights of torque and magnetic field, the coordinates are changed to complete the orthogonal or decoupling control. The vector manipulation method is of epoch-making significance. However, in practical application, because the rotor flux is difficult to observe accurately, the system characteristics are greatly affected by the motor parameters, and the vector rotation change used in the control process of the equivalent DC motor is more complex, which makes it difficult to achieve the ideal analysis results of the practical control effect.
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