Importance

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Abstract

An improvement in DC rotary machine is disclosed. The stationary field yoke of the DC rotary machine has a cylindrical field member and a cylindrical bearing member of a smaller diameter than that of the field member. These members are made of oil-containing sintered alloy as a unitary member. The inner cylindrical surface of the bearing part of the stationary field yoke supports a rotary shaft rotatably therein. A motor coil assembly in a shape of cup is fixedly mounted on the rotary shaft. A generator coil assembly is also formed in a shape of cup which has a central opening in the botton wall of the cup. The diameter of the central opening is approximately equal to the outer diameter of the bearing part of the stationary field yoke. The open end of the cup like generator coil assembly is disposed in opposition to the open end of the cup like motor coil assembly and these two open ends in opposition to each other are jointed together with the interposition of an insulating element therebetween so as to form a rotary coil unit which encloses the field part of the field yoke. A commutator for generator is formed in a shape of cylinder the inner diameter of which is larger than the outer diameter of the bearing member of the field yoke and the commutator is secured to the generator coil assembly keeping a spacing between the commutator and the bearing member.

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First Claim