Three-phase electric motors have their operation based on the rotating electric field and this field appears when the alternating power system is applied at the motor poles.
The speed in three-phase motors is achieved through the frequency of the power supply, which provides optimal conditions for its operation at constant speeds.
The speed of rotation of the three-phase electric motor is provided by the speed of the rotating electric field, bearing the name of synchronous speed. It is indicated in function of the number of poles of the motor, poles that are part of the constructive characteristics of the motor. We can conclude, then, that the speed of the three-phase electric motor is proportional to the frequency of the motor.
Most of the electrical energy produced is generated in alternating current – AC. Three-phase AC motors are less complex than DC motors. This factor justifies the increasing use of this type of motor. With this, the absence of mobile contacts in its structure will ensure its operation for a longer period, without the need for constant maintenance. https://www.mrosupply.com/motors/ac-motors/pump-motors/25038_jl5030_baldor/