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how many poles does 3 phase, 60 hertz induction motor which runs at 715 r/min at no load and at 670 r/min at full load have and how is it calculated?
A pole in a 3-phase induction motor refers to a pair of magnetic poles created by the stator windings. These poles interact with the rotor's magnetic field and create the rotating motion required for the motor to function.
The number of poles in a 3-phase induction motor can be calculated by dividing the synchronous speed (in RPM) by the supply frequency (in Hz) and then multiplying it by 120. This formula is known as the pole formula and gives the total number of poles in the motor.
Knowing the number of poles in a 3-phase induction motor is important because it determines the motor's synchronous speed, which is the speed at which the rotating magnetic field travels. This information is crucial in determining the motor's operating speed and torque characteristics.
The number of poles and synchronous speed in a 3-phase induction motor have an inverse relationship. This means that as the number of poles increases, the synchronous speed decreases, and vice versa. This relationship is important in understanding the motor's performance and efficiency.
The number of poles in a 3-phase induction motor also affects the torque produced by the motor. A higher number of poles results in a higher torque, while a lower number of poles results in a lower torque. This relationship is crucial in selecting the right motor for specific applications that require a certain level of torque.