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In the case of vector control, we main control corresponding to the rotor magnetic field parallel and perpendicular direction of motor current and voltage. This suggests that we measured by electrical current must pass a PI controller for mathematical calculations, and then from the stator three phase static structure into the lamination dynamic structure of rotor d - q (parallel and perpendicular to the rotor magnetic field direction). Also, the control voltage at the motor also need through mathematical calculation to its by the rotor structure of d - q into the stator three phase static structure, and then input to the PWM modulation part. These transformation requires that we have the ability of mathematical processing, DSP and high-performance processors will be used as the core of the vector control. Although the www.dongfeng-motor.com transformation of the structure to need one step calculation could be done, but we will use two steps to describe more convenient.
Motor current first from the structure of the physics 120 degree phase stator three phase into a stable dynamic orthogonal orthogonal d - q structure, and then by the dynamic structure of the stator into the three-phase static structure of the rotor. In order to ensure effective results, these calculations must be P - I controller made within a sampling period. The above this kind of transformation and P - I needed for the controller voltage signal from the d - q structure into the phase structure of the stator coil operation just the opposite. Once the motor current is converted into d - q structure, control becomes very simple. We need two way P - I controller; A parallel control and rotor magnetic field of current, a vertical current control. Because of the parallel to the current control signal is zero, so it's make motor is parallel to 12v motor the current component is zero, it also have driven motor current vector all into vertical current. Since there is only vertical electric current to produce effective torque, motor efficiency is maximized. One P - I controller is mainly used to control the fan cover vertical current, torque demand in order to obtain consistent with the input signal. This also makes the vertical current was controlled in accordance with the requirements in order to obtain the required torque.
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