US374406A

US374406A - Daniel higham

Info

Publication number: US374406A
Authority: US
Publication date: 1887-12-06
Anticipated expiration: 1904-12-06

Description

(No Model.) D. HIGHAM.

REGULATION OF ELECTRIC GENERATORS.

No. 374,406. Patented Dec. 6, 1887.

N. PETERS. Plwloulhn n hcr. Washington. D. C.

UNITED, STATES PATENT OFFICE.

DANIEL HIGHAM, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE HIGHAlVI ELECTRIC MOTOR COMPANY, OF SAME PLACE.

REGULATION OF ELECTRIC GENERATORS.

SPECIFICATION forming part of Letters Patent No. 374,406, dated December 6, 18 87.

(-No model.)

vfor the automatic regulation of electric generators for the production of a constant current in circuits of varying resistances, due to translating devices which are switched into and out of the circuits.v

In the accompanying drawings, Figure 1 is a diagram illustrating one form of my invention, which is intended for the larger sizes of generators. Fig. 2 is a diagram illustrating another form,which isintended for the smaller sizes of machines, and Fig. 3 is a diagram of a modification.

Inthe construction shown in Fig. 1 the magnets F are wound with two sets of coils, one opposing the action of the other. The coils f, which are in a shunt-circuit around the armature, are the main energizing-coils, while the coils c, which are the regulatingcoils, are connected in series with the armature-coils in the working-circuit.

From the brush a extends a conductor, 8, with which is arranged to make contact an arm or armature-lever, 6, connected to the lead 19. An electro-magnet, E, whose coils arein the working-circuit, controls this armaturelever. When this armature'lcver e is not attracted by the electro-magnet, a shuntcircuit will be closed around the opposing coils, which are thus cut out of action.

When the current in the working-circuit rises above the predetermined strength, the

electro-magnet E will throw the opposing coils 0 into action by attracting the armaturelever e and breaking the contact at t, thereby reducing the magnetic intensity of the fieldmagnets. When the magnetic field becomes so reduced as to reduce the current in the working circuit below the predetermined strength, the armature-lever e of the electromagnet E will be drawn by the retractingspring 00 to make contact at 15, whereby the opposing coils 0 will be cut out through theshort 5o circuit of the conductor 3. The magnetic field then being increased again, the current will come up toits normal strengtlnwhereitisin this manner maintained constant.

In order that the current generated shall 5 5 not be pulsatory, the electromagnetic circuitbreaker above described should be so sensitive that the smallest appreciable variation in the working-current would be capable of effecting regulation. The cont-act at t will then be s0 rapidly made and broken thatthe current will be practically continuous. The number of ampere turns in the opposing coils should be such that the full current therein would so reduce the magnetic effect of the shunt-coils that the current of the shunt-coils could not produce sufficient potential at the terminals of the armature (when running at the working speed) to sustain the current of the shunt-coils against the resistance of the shunt-circuit. Under these conditions the electromagnetic circuit-breaker will be capable of maintaining the current constant with any resistance in the working-circuit up to its maximum resistance. 7 5

In the construction shown in the diagram, Fig. 2, the current is maintained constant in substantially the same manner; but in this case, instead of employing opposing coils on the field-magnet, I put all the coils f in series and provide for throwing the entire field-magnet coils into and out of action by means of the electromagnetic circuit-breaker; but as these coils are the energizing-coils, and not opposing ones, the contact t is placed on the opposite side of the armature e from that shown in Fig. 1. It is not always necessary, however, that the entire field-magnet coils should be cut out. For instance, in cases where the trans lating devices are never all at one time cutout 0 of the circuits a portion only of the fieldinagnet coils need be short'circuited, as indicated in Fig. 3, so long as the magnetic field will be reduced sufficiently to check an excess of current when that portion of the coils is 5 cut out.

I claim as niy invention- In testimony whereofl have signed my name An electric generator having its field-inagto this specification in the presence of two subnet coils and armature-coils in series in the y scribing witnesses. Working-circuit, in combination with a short DANIEL HlGl-IAM. circuit around said series, field-magnet coils, \Vitnesses: and an electromagnetic circuit-breaker in the WILLIAM D. CONNER, working-circuit to close the said short circuit. I HARRY SMITH.