US1921112A - Wire wound armature - Google Patents

Description

V. G. APPLE Aug. 8, 1933.

OUND ARMATURE Filed Feb. 5, 1950 UNITED STATES PATENT OFFICE WIRE womyn ARMATYURE Vincent G. Apple, Dayton, Ohio; Herbert F.

Apple, Edward M. Apple, and Gourley. Darroch' executors of said Vincent G. Apple, deceased Application February 3, 1930. Serial No. 425,687

6'Claims. (01. 171-206) This invention relates to armatures of the class comprising a magnetizable core, a commutator and a wire winding having leads connected to the bars of the commutator.

The object of this invention is togenerally improve an armature of this class.

More specifically the objects are to provide an armature wherein the winding is embedded in and surrounded by a mass of hard molded insulation which also extends over and around apart of the commutator, through the interstices of the winding to the shaft, so cementing the several parts together as to effectively prevent relative movement of the core and commutator or of the turns of the wire one with another,- to the end that destruction of the armature due to breakage of the fine wires is eliminated, deterioration due to the absorption of oil, moisture and.

other foreign matter by the winding is prevented, a better running balance will be had, less air resistance to rotation of the armature will be encountered, and better driving relation between the driving and driven elements will be established.

I attain these objects by the structure illustrated in the drawing whereinv Fig. 1 is an axial section through a mold in which-my armature is completed.

Fig. 2 is a transverse section taken at 2-2 of Fig. 1.

Fig. 3 shows the completed armature on a reduced scale,

Similar numerals refer to similar parts throughout the several views.

To produce an armature according to my invention I assemble the core 10 on the shaft :11

then put on the wire winding, the back head 12 and the front head 13 extending beyond the core in the usual manner- The commutator compris-' ing a plurality of segments 14 imbedded in a hub 16 of insulation is then pressed lightly on to the shaft, the press fit being suflicient only to temporarily hold the commutator placed until the wire winding leads are connected to the commutator bars, after which further means are applied to permanently hold the commutator in place. The commutator has a groove 17 encircling it 'at its outer diameter dividing its length into two parts, the part 18 being used for the brush track and the part 19 having a longitudinal groove in the top of each segment into which the wire leads are placed and soldered or otherwise electrically connected' After all connections are made the armature is placed in the mold Fig. 1 which comprises the base 21 having an opening 22 to receive shaft 11, a larger opening 23 to receive part 18 of the commutator and a still larger opening 24 to receive the downwardly extending neck 26 of the mold body 27.

The body 27 has an opening 28 of the diameter of the core 10 all the way through. At the lower end of opening 28 is a collar 29 which surrounds and fits the front winding head 13 closely, having also an annular rib 31 extending into the groove 17 of the commutator. The, upper edge 32 of the collar rests against the core 10 so that there is no tendency for the core to be pushed toward the commutator when downward pressure is subsequently applied to the core; 'The collar is divided into three parts separated by radial planes 33.

In the upper end of the opening 28 of body 27 is the plunger 34 having the central opening 36 to admit the shaft 11 andthe cupped out portion 37 at the lower end to fit over the back head 12 snugly.

In placing the armature in mutator part 18 is first put into the'opening the opening 22. The three parts of collar 29 are then putaround the head 13 with the rib 31 in the groove 1'7. The body 27 is then brought downward with its opening 28 over the core 10 and over the three part collar 29. The insulation is then put in the upper end of theopem'ng 28, the plunger 34 entered and forced downward to the position shown forcingthe insulation the mold the com- 23 of the base 21, the shaft 11 extending through shaft 11 to make contact therewith and adhere thereto, so that after the fluid is solidified by such process as the nature of the insulation requires there will be a solid mass of insulation which cements the shaft, the core, the commutator and the windings together, providing driving relation between the shaft and the driven' parts, the windings being imbedded 'in and surrounded by the insulation, that portion surrounding the front head 13 extending also over the hub 16.02 the commutator to surround it so as to effectively prevent rotative or axial movement of the commutator relative to the core, either movement being destructive to the armature because the connections of the wires to the segments are usually broken -thereby. w

Fig. 3 shows the completed armature after 'removal from the mold, and, considered in connection with the foregoing description, it will be apparent that a better running balance is obtained, less air resistance to rotation is encountered, protection against absorption by the windings of oil, moisture and other foreign matter is assured, relative positioning of the several parts is-more firmly secured, and better driving relation between the driving and driven parts is established.

Holding this view of the scope of the invention, I claim 1. In an armature, a magnetizable core, a winding of insulated wire on said core, a commutator comprising a plurality of metal segments insulatedly spaced apart in a hub in axial alignment with said core and having its segments attached to flexible leads emanating from said Winding, and a separate concentric collar of hardened insulating cement extending from the core to the hub of the commutator cementing them together thereby maintaining their spaced apart relation, said winding being imbedded in and surrounded by said collar.

2. In an armature, a magnetizable core, a winding of insulated wire on said core, a commutator comprising a plurality of metal segments insulatedlyispaced apart in a hub in axial alignment with said core and havingits segments attached to flexible leads emanating from said winding, and a separate oncentric collar of hardened insulating cement i-extending from the core to the commutator and overlapping the inner end of the commutator cementing them together thereby maintaining their spaced apart relation, said winding being imbedded and completely enclosed in said-collar.

3. An armature comprising a magnetizable core, a commutator in axial alignment with said core, said commutator being composed of a plurality of segments of conductive material imbedded in a hub of molded insulation, a winding on said magnetizable core composed of a plurality of turns of wire having flexible leads at intervals joined to bars of said commutator, and a separate concentrically molded collar of insulating cement extending from the core to the commutator and overlapping the insulation hub of said commutator cementing the core and commutator together thereby maintainingtheir spaced apart relation, said winding ,being imbedded and completely contained in said collar.

4. An armature comprising a shaft, a magnetizable core on said shaft, a commutator comprising a plurality of metal segments ,insulatedly spaced apart in a hub on said sha'ft said hub being axially spaced apart from said core, a winding on said core extending beyond the end thereof and surrounding said shaft, flexible lead wires emanating from said winding and connected to said commutator, and a smooth, round, concentric collar of molded insulating cement extending from the core to the commutator hub and through the winding to the shaft completely enclosing the winding and cementing the commutator and winding to the shaft to maintain driving relation therebetween.

5. A method of assembling and permanently uniting a wire wound armature core, an armaturc shaft, and a commutator, which consists of placing the core on the shaft, placing the winding on the core, lightly pressing the commutator on the shaft, connecting the winding to the commutator, placing the assembled structure in a mold, holding the commutator and core from moving toward or away from each other by a portion of the mold, pressing a mobile insulating cement around the shaft, through and around the winding and the connections, between thewinding and the commutator and around the end of the commutator hardening the cement, then removing the structure from the mold.

6. Steps in the method of making an armature which consists of winding a plurality of turns of insulated wire into the slots of a core leaving circumferentially spaced apart wire leads extending, molding a core of insulation into a plurality

Images