How is the rotating field created by applying three-phase AC to the asynchronous motor?
• How does the inverter create three-phase AC from DC with varying frequency and voltage? These points are explained below. How is torque generated? We should start from Fleming’s left- and right-hand rules (Fig. 9). Fleming’s left-hand rule explains the force applied to a conductor in a magnetic field when current is applied to the conductor. Under the rule, the direction of the magnetic field is denoted by the index finger, the direction of current is denoted by the middle finger and direction of the force applied to the conductor is denoted by the thumb, when each is held at 90° to the other. The strength of the force applied to the conductor is proportional to the product of the field strength and power of the current. Fleming’s right-hand rule describes the direction and strength of voltage generated on the conductor moving through the magnetic field. When the same three fingers are held at 90° to each other, the index finger denotes the lines of the magnetic force, the thumb deno
