US738757A - Compensating system. - Google Patents

Description

PATENTED SEPT. 15, 1903.

F. G. BAUM.

GOMPENSATING SYSTEM.

APPLICATION FILED 0GT.17, 1902.

EJ/O/ I FRANK G. BAuM,

UNITED STATES Patented September 15, 1903. Q.

PATE T OFFICE.

FRANK GEORGE BAUM, OF PALOALTO, CALIFORNIA, ASSIGNOR TOv STANLEY ELECTRIC MANUFACTURING COMPANY, OF PITTSFIELD, MASSACHU- SETTS, A CORPORATION OF NEl/V JERSEY.

COMPENSATI NG SYSTEM.

SPECIFICATION forming part of Letters Patent No. 738,757, dated September 15, 1903.

Application filed October 17, 1902. Serial No. 127.712. (No model.)

To all whom it may concern:

Be it known that I, FRANK GEORGE BAUM, a citizen of the United States, residing at Palo Alto, countyof Santa Clara, State of California, have invented certain new and useful Improvements in Compensating Systems, of which the followingis a full, clear, and exact description.

My improvements relate to compensating systems, and have for their object to produce a new and improved system in which the lag in the current of an alternating-current generator is compensated for when there are variations in the inductive load; and it consists in IS the matters herein specified.

The following is a description of my invention, reference being had to the acoompanying drawings, in whieh- Figure 1 represents diagrammatically a sys- 2o tem embodying my invention. Fig. 2 is a diagram representing electromotive forces and currents. Fig. 3 represents diagrammatically a modification of my system.

Referring more particularly to the draw- 2 5 ings, G represents a two-pole alternatingcurrent generator supplying motors M M and having an exciting-coil F.

E represents an exciter having afield-coil F supplying the field-coil F of the genera- A is an auxiliary exeiter supplying the fieldcoil F which is also upon the field-magnet of the exciter E. The armature B of the auxiliary exciter A supplies a direct current.

The field-magnet O of this auxiliary exciter is energized by the coil 1), which is supplied bycurrent from the transformer T. The pas sage of this current through the coil D is controlled by the rings H and I, as follows: H is a semicircular conducting-ring, upon which bears the brush J. I is a continuous conducting-ring, upon which bears the brush K. These rings are mounted so as to revolve synchronously with the generator G, the ring H 5 .being so placed that when there is no lag in the current supplied by the generator G the brush J is in contact therewith from a little ahead of one maximum to a little ahead of the next succeeding maximum-that is, so

that the rectified voltage obtained will com- 0 pensate for the drop in pressure in the generator and its connected line at non-inductive load. This is represented in Fig. 2, in which 0 represents the wave of the current supplied by the generator G through the transformer T, and H represents the position of the ring H relatively thereto when the load is non-inductive Under these circumstances it will be seen that the portion of the currentwave from a little aheadof the points 0 and O will be impressed upon the coil D of the auxiliary generatorA. If new the currentO in the circuit of the main generator lags, the effect is the same as though the semicircular ring H were advanced relatively to the cur- 6 5' is, has a negative lag of ninety degrees--the relation will be shown by the line H of Fig. 2, in which case the part of the wave between. the lines 0 O willbe impressed upon the field-magnet of the auxiliary exciter A, producing an opposite polarity from that produced when the lag of the main current is a positive lag. By this means the lag in the circuit of the main generator automatically acts upon the auxiliary exciter A to impress upon the main exciter E, and through it upon the field of the generator G, a magnetizing force which compensates for the eifeot of the lag upon the generator G and does this without regard to whether the lag is positive or negative.

In the above-described arrangement the electromotive force is intermittently impressed upon the coil D. In the second form (shown in Fig. 3) an electromotive force is im- 9 5 pressed upon the coil D all the time, this being brought about by using an additional seg ment h and making the brush K bear upon the cylinder thus formed instead of upon the continuous ring. The brushes K and h are spaced one hundred and eighty electrical degrees. The segments 1-1 h are separately connected to the collecting-rings I 1 which by means of brushes '5 t are connected to the terminals of the coil D. In this way substantially the same results are obtained, with the additional result that compensating current is supplied to the field of the auxiliary exciter continuously.

R is a rheostat in the field-circuit of the exciter A.

It is clear that while I have shown specific embodiments of my invention my invention is broader than such specific embodiments, and therefore I do not desire to be limited to the same or to the particular details shown and described. For example, in the modifications shown in Fig. 3 the transformer T may be omitted, if desired, and the current of the main circuit used directly upon the fieldcoil of the auxiliary exciter, but I prefer the arrangement shown.

Vhat I claim is- 1. The combination of a main alternatingcurrent generator, an exciter therefor, an auxiliary exciter having its field energized by a circuit' having a substantially constant current relation to that of the main circuit, and means for directing thecurrent generated by the auxiliary exciter through a field-winding of the main exciter.

2. The combination of a main alternatingcurrent generator, an exci ter therefor, an an xiliary exciter having its field energized by a circuit in inductive relation to that of the main circuit, and means for directing the current produced by the auxiliary exciter through a field-winding of the main exciter.

3. The combination of a main alternatingcurrent generator, an exciter therefor, an auxiliary exciter, a circuit for energizing the auxiliary exciter having a substantially constant current relation to that of the main circuit, means for dividing each cycle of said energizing-eurrent to increase the energizing effect as the current of the main circuit lags, and means for directing the current generated by the auxiliary exciter through a fieldwinding of the main exciter.

4. The combination of a main alternatingcurrent generator, an exciter therefor, an auxiliary excite r, a transformer in series with the main circuit, a circuit supplied by said transformer for exciting said auxiliary exciter and means for directing the current generated by the auxiliary exciter through a field-winding of the main exciter.

5. The combination of a main alternatingcurrent generator, an exciter therefor, an auxiliary exciter, a transformer in series with the main circuit, a circuit supplied by said transformer for exciting said auxiliary exciter, means for dividing the cycles in said energizing-circuit to increase the energizing effect as the current of the main circuit lags, and means for directing the current generated by the auxiliary exciter through the field-winding of the main exciter.

6. In combination, a main alternating-current generator, a compensating exciter, a circuit for energizing said exciter supplied from the main circuit of said main alternating-current generator, and means for impressing upon said circuit the electromotive forces during one hundred and eighty degrees of the cycle beginning with a little before the maximum voltage of said cycle when the load on the main generator does not produce a currentlag.

7. In combination, a main alternating-current generator, a compensating exciter, a circuit for energizing said exciter supplied from the main circuit of said main alternating current generator, and a switch directing said current so that when the current is non-lagging substantially equal and relatively similar parts of successive phases are impressed upon said exciter, said parts beginning and ending a little before the positive and negative maxima voltage of each cycle.

8. In combination, a main alternating-current generator, an exciter acting to compensate for lagging currents, a circuit for energizing said exciter supplied from the main circuit of said main alternating-current gen erator, and a switch directing said current so that when the current is non-lagging substantially equal and relatively similar parts of successive phases are impressed upon said exciter, said parts beginning and ending a little before the positive and negative maxima voltage of each cycle, and a second exciter intermediate to said first exciter and said generator.

9. In a compensating system, an alternating-current generator, a directing-switch having members which when the current is non lagging make contact at a little before one voltage maxim um of each cycle and break contact a little before the next succeeding maximum voltage of each cycle, and thereby impress relatively the same parts of successive cycles upon an energizing-circuit carrying the current they control.

Signed at Palo Alto, California, this 15th day of September, 1902.

' FRANK GEORGE BAUM.

WVitnesses:

ALBERT W. SMITH, GEO. F. MADDooK.

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