Final answer:
The imaginary component of the stator current when an induction motor is loaded will flow in a direction that opposes the change in magnetic flux due to the load, according to Lenz's law. This means increased reactive current flows in the opposite direction to the rotor slip induced by the load.
Step-by-step explanation:
The question revolves around what is the direction of flow of the imaginary component of stator current when the induction motor is loaded. In an induction motor, when load is applied, the rotor slows slightly compared to the synchronous speed, resulting in what is known as 'slip'. This slip causes the stator to draw more current from the power supply to maintain the torque necessary to drive the load. Lenz's law stipulates that the direction of induced currents is such that it opposes the change that produced it. Thus, the imaginary component (or reactive component) of the stator current, which is associated with the creation of magnetic fields and thus inductance, will flow in a direction that opposes the change in magnetic flux due to the load. When the motor is considered as a generator, such as when it is driven mechanically, it produces an electromotive force (emf). The direction of this induced emf is given by Faraday's law of induction and can be determined by various right-hand rule methods. The induced emf will cause currents to flow in a manner that supports or opposes changes in the magnetic flux, depending on the nature of the mechanical input and the associated changes in flux linkage. In the context of motor operation, the induced currents due to the stator and rotor interaction are carefully managed to control the motor's operation effectively. Overall, the direction of the imaginary component of stator current will oppose the rotor's slip due to the load, which is in accordance to the principles laid out by Lenz's law. During regular operation of an induction motor, this means an increased reactive current flowing in the opposite direction to the change in magnetic flux caused by the load.