Single-phase motors, by their very nature, require more maintenance and have significantly shorter lives.
Single-phase motors lose efficiency as horsepower increases. As a matter of fact, at any horsepower greater than 5, single-phase motors are only marginally efficient.Operational cost savings can be readily realized by using Three-Phase motors.
Three-phase motors cost less than single-phase motors! Three-phase motors last longer and are more dependable and durable!