We often have industrial and residential facilities for which the power is made with two phases or phase-neutral, requiring single-phase motors. The basic principles of single-phase motors are similar to those of three-phase induction motors. The rotor of a single-phase induction motor is usually of the squirrel cage type, and there is no physical connection between the rotor and the stator in the three-phase, but there is an equal air gap between them. The buttresses of the stator are normally distributed and as in a single-phase winding they do not form a rotating field or starting torque, this winding is divided into two parts, each of which is spaced apart in space and time and usually with different characteristics. It thus has two coils in parallel, connected to the same source of alternating current. high pressure grease hose
Since only two phases or one phase and one neutral are present, several techniques are used to form the basic rotating magnetic field for starting single-phase induction motors. Some of them are demonstrated, since the rotor of a single-phase induction motor starts its rotation, driven by the rotating field, will remain working with the single-phase power supply.