Giovanni fcb
giovanni fcb

Single Phase Induction Motors – Basic Information

The single-phase induction electric motor is the only motor that has a single winding in the stator. This winding generates a field that is non-rotating, but alternates along the winding axis. When the rotor is stationary, the stator field induces currents in the rotor. The field generated in the rotor has opposite polarity to that of the stator according to the Law of Lenz.

The opposition of the fields determines the appearance of forces acting on the upper and lower parts of the rotor, tending to rotate it 180º from the initial position. The action of forces is equal in both directions, as they act through the center of the rotor (left hand rule). The rotor is then stopped. However, if the rotor is rotating when the motor is started, it will continue to move in the initial direction because the action of the forces will be driven by the inertia of the rotor.

Since the field created by the single-phase voltage applied to the stator winding is pulsating, single-phase induction electric motors develop a pulsating torque, so they are less efficient than the torques of three-phase motors that are more uniform.

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Proper handling with electric motor transport

Much is said about the proper transportation of electric motors. Some professionals say that the electric motor is prepared for heavy work and in a hostile environment and therefore there would be no need for special care during transportation. Others say that shipping should be extremely careful as they are precision components.

In most cases the transport of electric motors does not need to be extremely sophisticated with special packaging and materials, but it can not be transported in any way that can be thrown or be carried loose in the means of transport.


The biggest problem for the electric motor is in precision components such as bearings that will be subject to vibrations during transportation and can be severely damaged and unusable. Movements under cyclic vibrations occur in the contact areas between the rolling elements (balls or rollers) and the bearing tracks. Depending on the vibration intensity, lubrication condition and load, a combination of corrosion and wear occurs forming depressions in the bearing tracks. In the transport of the electric motor this can be caused when the shaft is transported loose and can move freely.

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