The effects of structure, gap magnetic field, rotor thickness, magnetic pole Numbers of rotor and winding layers of stator of the micromotor on it's output torque are discussed in detail.

Also, MMF of the field winding is represented as electric currents in the gap between poles, with regard to magnitude and direction of magnetic field at respective poles.

The torsional deflection of spiral winding for the large power transformer is mostly caused by the common effect of the axial current component and the radial leak magnetic field.