Final answer:
The rotor in a resistance split-phase motor is essential for converting electrical energy into mechanical energy, with its resistance contributing to the motor's power dissipation. Back emf, induced in the rotating coil of the rotor, opposes the input emf and is a key factor in the efficiency and performance of the motor.
Step-by-step explanation:
Significance of Rotor in a Resistance Split-Phase Motor
The rotor is a crucial component of a resistance split-phase motor, which is designed to convert electrical energy into mechanical energy. The resistance of the motor is typically low due to the multiple windings of copper wire. It's essential to understand that the power dissipated by the motor is significant, as the thermal power dissipation is directly proportional to the square of the current (P = I²R).
Back Electromotive Force (emf)
During operation, any rotating coil in the motor, such as the rotor, will have an induced emf commonly referred to as back emf. This back emf opposes the emf input to the motor and is a critical factor in determining the performance and efficiency of the motor. Back emf is zero when the motor is stationary and increases with the motor's angular velocity, modulating the current drawn by the motor and therefore the power dissipated as heat.