Three phase induction motors are cheaper and more efficient induction motors that are used in a variety of electrical applications. The inductor uses three alternating sine waves that are separated by 120 electrical degrees. A sine wave is a smooth and repetitive oscillation that appears in a curving wave, as opposed to other waves that are shaped like triangles or squares. The sine waves reduce the load per phase and increase the number of magnetic coils, which are loops of magnetic energy. Additional coils make starting easier, which increases the efficiency of the motor and reduces downtime.
AC Induction Motor
The three phase AC induction motor is a rotating electrical machine. The conduction complexity is medium. This type of motor is very reliable and efficient at low speed. This motor is controlled by multi-phase inverter controls, which allow the motor to be set at different speeds at different moments, according to Free Scale. Speed control can be accomplished without sensors, as opposed to other kinds of motors. This motor can have very low cost in relation to the amount of horsepower that it gets. The torque power of this motor when first started is higher than other motors.
Three Phase Electric
The three phase electric motor is compact and less expensive than one phase electric motors. They are also more efficient and their design is much simpler. They are used for blowers, conveyor drives, compressors, fans, and other forms of machinery that must operate very efficiently. This type of motor can also generate energy that can be transferred over longer distances than other motors, according to Three Phase Power. These types of motors are often combined with embedded systems that must also operate with almost perfect reliability.
Constant Torque
Constant torque three phase motors provide the same amount of torque regardless of the operating speed. Most applications have constant torque three phase motors. The result is that the power output varies directly with speed, according to Pacific Liquid. Mixers, conveyors and compressors must have constant torque.
Constant Horsepower
Constant horsepower three phase motors are used for applications that require higher power at lower speeds and lower power at higher speeds, according to Pacific Liquid. For example, this occurs in manufacturing situations where difficult cuts can be made slowly and where precise finish cuts must be made quickly. These motors have speeds that are inversely proportional to their power. They are used with drills, lathes and milling machines.