If you are wondering about the difference between 3 stage vs single stage AC motors, just remember this. Single stage AC motors usually are powered by a single phase source of power while 3 phase AC motors are powered by a three phase way to obtain power. The single stage alternating current is the most typical source of power used by the majority of households and non commercial businesses. It’s the power that can be used to light homes and power TVs in THE UNITED STATES. Today, most commercial structures in the US use the 3 phase alternating electric current motors due to its versatility an power density. The 3 phase AC motor is particularly common in huge businesses which includes in the manufacturing and industrial businesses.
Data centers today have become power intensive, so that they can become able to offer storage space and computing capabilities. This has led to the growth in demand of power supply to meet the needs of the data centers. The one phase alternating current power motor can no longer meet up with the power needs of these data centers since it requires costly rewiring. Three phase alternating current power motor is economical to supply power to data center since it requires less conductor material 
to provide electrical power. This explains why 3 stage alternating current motor is utilized in electric transmission, era and distribution generally in most countries worldwide. The single phase alternating current motor is less reliable and more costly to be utilized in a national electrical power grid compared to 3 phase alternating current motor.
Both 3 phase and single phase ac motors contain two parts, namely the rotor and stator. The stator is the part of the motor, which is stationary while the rotor is simply the rotating part of the motor.