US554670A

US554670A - Induction-machine

Info

Publication number: US554670A
Authority: US
Publication date: 1896-02-18
Anticipated expiration: 1913-02-18

Description

(No Model.) 2 Sheets-Sheet 1 W. K. FREEMAN.

INDUCTION MACHINE No. 554,670. Patented Feb. 18, 1896.

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I 2 Sheets-Sheet 2. W. K. FREEMAN. INDUCTION MACHINE N0. 554,670. Patented Feb. 18, 1896.

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UNITED STATES PATENT Orricn- XVALTER K. FREEMAN, OF FORT TVAYNE, INDIANA.

lNDUCTlON -MACHINE.

SPECIFICATION forming part of Letters Patent No. 554,670, dated February 18, 1896.

Application filed July 5, 1895. Serial No. 555,054. (1% model.)

To aZZ whom it may concern:

Be it known that I, WALTER K. FREEMAN, of Fort \Vayne, in the county of Allen, State of Indiana, have invented certain new and useful Improvements in Induction-Machines; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification, and to the letters of reference marked thereon.

This invention relates to improvements in current-generators and motors, the improvements being more especially applicable to consequent-pole machines, and hence a machine of this character has been illustrated.

The invention resides in certain novel details of construction and combinations and arrangements of parts whereby a compact structure is produced in which a magnetic circuit is secured with a minimum air-gap between the field and armature-core, the lines of force finding a path of minimum resistance, thereby preventing excessive heating and permitting the machine to run loaded to any point within the limit of its capacity.

Referring to the accompanying drawings, Figure 1 is an end elevation of a machine constructed in accordance with this invention. Fig. 2 is an elevation taken at right angles to Fig. 1 with one of the movable sections of the field swung back. Fig. 3 is a top plan view of the frame. Figs. 4 and 5 are vertical sectional views of the frame, taken at right angles to each other.

Like letters of reference in the several figures indicate the same parts.

The main frame of the machine is preferably made in an integral casting embodying the base A and the two cheek-pieces or uprights 13, between which the pole-pieces of the field are located, together with the body of the armature, as will presently appear.

One of the poles C, a consequent pole, is usually formed integral with the base, centrally between the cheek-pieces, and at the ends between the cheek pieces there are formed seats D for the ends of movable fieldsections E, which latter fit quite accurately between the cheek-pieces and are normally clamped in such position by bolts c passing in through the edges of the said cheek-pieces.

The movable field-pieces E are angular,

both together forming a complete bridge, the line of division between them preferably being centrally of the upper consequent pole F. In other words this upper pole is formed half on one field-piece and half on the other. The main or prime pole-pieces G, around which the field-coils G are placed, project from the inner faces of the upright portions of the fieldpiecesat diametrically-opposite points.

Clamping-bolts E, at the lower ends of the movable field pieces, are adapted to form pivots on which the field-pieces may be turn ed out to the position shown on the left in Fig.

2, thus opening the machine for inspection or repairs and permitting the convenient removal or renewal of the field-coils. WV hen the field-pieces are turned back, as indicated, the whole armature is exposed between the cheek-pieces, and, if desired, maybe removed in the ordinary manner@'. a. by releasing its shaft from the bearings, one of which, K, is mounted on one of the cheelcpieces and the other of which is on a standard L on the base, sufficiently removed from the cheek-pieces to allow for the location of a commutator M next to the body of the machine.

The commutator-brushes N are preferably supported by the bearing-standard; but the form of brush employed is inconsequential, and hence no particular description of the same is necessary.

To facilitate the insertion and removal of the armature, as well as to secure a more perfect concentration of the lines of force,'

the cheek-pieces are formed with circular openings Q of a size to allow the armature to pass therethrough, and the bearing K may be supported by a plate or casting K, bolted to the face of the cheek-piece by bolts 70, as shown in Fig. 1.

By this construction it will be seen that the armature and fields are entirely inclosed by a magnetic armor, as it were, and the lines of force find the best possible path between the poles, and by making the structure rigid the armature may be run very close to the pole-pieces without danger, thereby securing a short air-gap, the resistance of which is very slight as compared with machines of ordinary construction.

Having thus described my invention, what I claim as new is- I scribed.

In a consequent-pole induction-mach inc, the combination with the base having the cheek-pieces projecting upwardly therefrom of the oppositely-arranged movable fieldpieces clamped between the cheek-pieces and inelosing the space for the armature, the polepieces and cores projecting from the bodies of said field-pieces, and the consequent-pole piece formed by a portion of each field-piece; substantially as described.

a. In a consequent-pole in duction-machine, the combination with the base having the check-pieces projecting upwardly therefrom and a consequent-pole piece on the base, intermediatc the cheek-pieces, of the independent field-pieces having the main and top consequentpole pieces thereon, clamped between the cheek-pieces and surrounding the armature, and the armature arranged transversely of the cheek pieces; substantially as described.

5. Ina consequent-pole induction-machine,

the combination with the base having the upward]y-projecting cheek-pieces, the polepiece located centrally between the cheekpieces, and the seats for the field-pieces at the ends of the check-pieces, of the independent field-pieces clamped between the cheek-pieces, seating in said seats and having projections meeting at the center of the machine to form the upper pole-piece, the main pole-pieces projecting from the upright portions of the field-pieces, the coils surrounding the same, and the armature journaled transversely of the cheek-pieces; substantially as described.

6. In a consequent-pole induction-machine, the combination with the base having the upwardly-extending cheek-pieces with a unature-openings formed therein, the central pole-piece and the seats for the field-pieces all in one casting, of the independent fieldpieces seating in said seats and having overhanging portions meeting at the center to form the top consequent pole, the main polepieces projecting inward from the upright portions of the field-pieces, the coils surrounding said poles the armature journaled between said poles transversely of the cheekpieces and the bolts uniting the cheek-pieces and field-pieces at the bottom and adapted to serve as trunnions on which the field-pieces may be swung back; substantially as described.

WALTER K. FREEMAN.

Attcst:

ALEX. S. STEUART, A. M. KELLY.