Apparatus for controlling speed in vector controlled an ac motor

The present invention is a vector control alternating current to reduce the noise and vibration of the AC motor by applying a more precise speed control and torque control by suppressing the error of the measured current generated by a current sensor, peripheral circuits according to the current detection of the alternating current motor It provides an apparatus for controlling speed of the motor. The present invention can deviate from the burden of having to spectral analysis, such as conventional, the method can be implemented without having an expensive processor and economic Offset error, PI control, vector control, speed control, current compensation, the error calculation, the phase current