How does the cost of a phase converter compare to that of replacing three-phase motors with single-phase ones?

electric motor

In small horsepower ratings (under 3 HP), it may actually be economical to replace the motors.

When the motor size is larger than 5 HP, however, single-phase motors are extremely difficult to find and expensive.

Single-phase motors are also far more maintenance-prone and much less efficient than three-phase motors.