Method of making armature of double insulation construction
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsTomiaki Sakano, Hiromichi Yamamoto, Shigeru Kajiwara
Life of this patent
Estimating the term…
Abstract
An armature of double insulation construction for commutator motors of the wound-rotor type and a method of making the armature. An insulator insulating an iron core from a shaft and windings from the iron core also insulates a commutator from the shaft and unites the shaft, iron core and commutator into an integral rigid body. The armature can be fabricated with high precision by a simplified method.
Claims6
A method of making an armature of double insulation construction comprising the steps of placing in position within a first mold member (5) a clamp ring (7) surrounding a holding mold member (6) having commutator segments fixedly press-fitted therein along its inner periphery;
- then placing in position on the first mold member (5) a second mold member (8) for circumferentially supporting an iron core (2) having circumferentially spaced teeth;
- thereafter placing a shaft (1) and the iron core (2) into the mold members (8), (5) with a specified clearance provided between the shaft and each of the commutator segments and the iron core;
- further placing a third mold member (9) above the holding mold member (6) and supporting the teeth of the iron core therebetween against vertical displacement;
- pouring an insulating material into the space in the resulting mold assembly around and between the parts placed therein;
- allowing the mold assembly to stand for a specified period of time to cure the material and thereby unite the shaft and the iron core into a rigid body with the shaft and core insulated from each other, the commutator segments into a rigid body as a commutator with the segments insulated from one another, and the commutator and the shaft into a rigid body with the shaft and commutator insulated from each other all at the same time;
- opening the mold assembly, withdrawing the resulting product therefrom, and winding conductors on the iron core.
Dependencies are inferred from the claim text.