## a) AC Induction Motor Current Under Different Load Conditions 1. **No Load Condition** - When the motor runs without load (just spinning freely), it draws a small current from the supply. - This current, called **no-load current**, mainly supplies: - Core losses (iron losses) - Friction and windage losses - Small magnetizing current to establish the rotating magnetic field 2. **Increasing Load** - As mechanical load increases, the rotor slows slightly, **increasing slip**. - The motor draws **more current** to produce the extra torque needed. - The additional current is called **load (or torque) component** of the current. 3. **Full Load Condition** - At full rated load, the motor draws its **rated current**. - Most of this current is used for producing the required torque; a smaller part is still used for magnetizing. 4. **Overload Condition** - If the load exceeds the rated value, the current increases further. - Prolonged overload can **overheat** the motor and cause damage. --- ## b) Diagram: Current vs Load in an AC Induction Motor Below is a simple representation showing how the current drawn by the motor increases as the load increases: ``` Motor Current ^ | | / | / | / | / | / | / |_______/______________> Load (Torque) No Full Over Load Load Load ``` - The curve starts at the no-load current and rises as the load increases. - At no load, the current is small. - As load (torque) increases, current increases accordingly.