Single phase electric motor unit is simply one winding, the rotor relates to the squirrel-cage type. When your single-phase sinusoidal current using the stator windings, the motor will produce an alternating magnetic field, the magnetic field strength and direction of change previously intercropping sine law, but also from spatial orientation is bound, what is known as the alternating magnetic field is pulsating magnetic field. The alternating magnetic field pulse are often decomposed into two with just one speed, direction of rotation belonging to the rotating magnetic field opposite one anoher, when rotor is stationary, the 2 main major rotating magnetic field in your rotor produce two equal and opposite torque, making the synthesis torque is zero, now the motor simply cannot rotate. When folks use force to form the motor to rotate in one direction (eg clockwise rotation), next clockwise rotation within the rotor in addition to the rotating magnetic field, magnetic field lines involving the cutting movement is small; counterclockwise rotation of your respective rotor and then the rotating magnetic field in between larger magnetic field lines cutting exercise. This may break niche, the whole generated by your rotor about the electromagnetic torque will no longer be zero, the rotor will spin up of the drive direction.
 For single phase motor unit can automatically rotate up, blower fan motor capable to get started with a stator winding, starting winding and main winding 90 degrees difference in space, starting winding connected in series for a suitable capacitor, while using the main winding current upon the approximation belonging to the phase difference of 90 degrees, the so-called split-phase theory. This difference try to increase, two 90-degree power flow in the two 90-degree difference inside of the space of winding will produce in space (two phase) rotating magnetic field, within your rotating magnetic field, the rotor will automatically start, start and after the rise towards a certain speed when attached with the rotor on a centrifugal switch along with other automatic device to disconnect the first winding during normal operation a perfect primary winding work. Therefore, the starting winding can be done short work. However, often, starting winding is unable to disconnect, we call this motor really is a single-phase motor, to rotate the direction of rotation, may change the positioning of the capacitor in series to perform.
 Within your single phase electric motor, the rotating magnetic field produced another method identified as shaded pole method, otherwise known as single-phase shaded pole motor. Salient-pole motor stator made of thinking about, there are two main poles and four poles two. Each pole around the all-pole surface of the open 1/3--1/4 a nice groove, the pole is split into two parts, in a organ of the package with a short-circuit copper ring, as if this a part of the pole you then exactly the same, What are known as shaded pole motor. Single-phase winding takes hold the complete pole, each pole of a coil is either series connection to make the polarity really should be accompanied by N, S, N, S arrangement. If ever the stator windings are energized, a key magnetic flux generated for the magnetic poles, according to Lenz's law, which the main magnetic flux inside the short circuit copper ring contained in the copper ring to develop a phase lag of 90 degrees on your induced current, our present-day generated by its magnetic via the phase lag may be the most important flux,  worm reducer motor its role therefore the motor start winding capacitance similar to the motor rotating the rotating magnetic field generated up.