Control method of pulse width modulation variable frequency converter: sine wave pulse width modulation (SPWM) control. Eliminates the PWM control of the specified number of harmonics. Current tracking control. Voltage space vector control (magnetic chain tracking control). Progress of AC motor variable frequency adjustment control method: from the scalar control (V/f control and differential frequency control) to high dynamic performance vector control and direct torque control development. Develop vector control and direct torque control systems without speed sensors.
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