Single-phase AC motors are extremely common in all walks of life. The vast majority of motors powered by the household or light industrial mains supply are single phase. One of the keys is to size the motor correctly for the application. If the motor doesn’t generate enough torque for the design it will always be running at maximum, putting more strain on the components and generating too much heat. Similarly, if the motor is too big it will not operate efficiently and will waste energy.
However, single-phase power sources can be used to generate a three-phase variable frequency supply to drive a 3-phase induction motor.
A single-phase induction motor drive can also see torque ripple, which is a regular change in the output torque, and the difference between the maximum and minimum figure is often expressed as a percentage to highlight the controllability of the motor.
Fault detection in single-phase induction motors usually requires sensors as there is not sufficient information to implement more complex sensorless algorithms.