The key to applying vector control technology mainly includes accurate motor parameter measurement, appropriate coordinate transformation, accurate current control, high-performance speed detection, and advanced control algorithms. The following is a detailed introduction:
Accurate motor parameter measurement
The parameters of the motor, such as stator resistance, rotor resistance, stator inductance, rotor inductance, mutual inductance, and pole number, are the basis of the vector control algorithm. The accuracy of these parameters directly affects the control effect. Usually, the motor parameters can be accurately measured by no-load test, short-circuit test, etc., or the automatic parameter identification function of the inverter can be used to automatically detect and calculate the relevant parameters before the motor runs.
Appropriate coordinate transformation
Vector control requires the conversion of physical quantities in a three-phase stationary coordinate system to a two-phase rotating coordinate system for analysis and control. The commonly used coordinate transformations are Clarke transform and Park transform. Through appropriate coordinate transformation, the complex model of the AC motor can be simplified to a model similar to the DC motor, so as to realize independent control of the motor flux and torque. In practical applications, the appropriate coordinate transformation method should be selected according to the type of motor, control requirements and system characteristics, and the accuracy and stability of the transformation process should be ensured.
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