PURPOSE: To raise the efficiency of a rotary transformer equipped with a pole core and a yoke core connecting the pole core by shortening the length of its winding and lessening the resistance of its winding by such an arrangement wherein stator winding is wound around the outer circumference of the yoke core and the length of the outer circumference of the yoke core is made smaller than the outer diameter of a rotor core.
CONSTITUTION: A stator is functionally divided into two parts and such a part which is magnetically connected to a rotor core 31 with a small gap provided between them is divided into a core 12 and a core 13 which magnetically connects 2 cores 12 in the axial direction. The pole core 12 is opposed to the rotor core 31 with a gap maintained between them. To make the gap smaller, the outer circumference of the rotor core 31 is circular and the internal surface of the pole core 12 of the stator is circular in construction. Further, the length of the outer circumference of a yoke core 13 connecting pole cores 12 is made smaller than the circumferential length of the outer diameter of the rotor core 31 at least. When an AC current is caused to flow through the winding wound around the outer circumference of the yoke core 13, a magnetic flux flows through a passage like 41 and an AC magnetic flux flows inside the winding of the rotor, and by this, a voltage is induced in the winding of the rotor and electric power is sent to the side of rotor from the stator side.
ABUKAWA TOSHIMI
TAWARA KAZUO
TAKAHASHI NORIYOSHI
