US890979A - Multiple-series relay-controller. - Google Patents

Description

No. 890,979. I PATENTED'JUNE 16, 1908. G. T. HENDERSON.

MULTIPLE SERIES RELAY CONTROLLER,

APPLIGATION FILED SEPT.6,1907.

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.cLAR TL HENDERSON, or MILWAUKEE, WISCONSIN, 'ASSIGNOR TO THE CUTLER-HAMMER I MFG. 00., or MILWAUKEE, WISCONSIN, A CORPORATION or WISCONSIN.

I Massacre.

' MULTIPLE-seams nnnenconrnoanns.

Specification of Letters Patent.

Patented Tune 16, 1908.

Application filed september 6, 1907. Serial No. 351,593.

whom it may concern:

Be it known that I, CLARK T.IHENDIRSON,

-a' citizen of the United States, residing at "Milwaukeefin the county of Milwaukee and reference being had to the accompanymg State of Wisconsin, have invented-new and useful'lmprovements in Multiple-Series Rela fu 'Contr'ollers, of which the ollowing is a l,- clear, ;"concise, and exact description,

drawing-,iprminga part of this specification.

'Mylnvention relates to improvements, in

electric motor controllers, and it applies par- 'fticularlyto motor controllers in which the ,startin resistance is controlled'by a' lura ty ofindependent switches.

means of he'objeet r myinvention is a provide certain im rovements. in means whereby swim (JUXTGIIU.

will arrestedlw de -there is an abnormal In accordah ce' with the preferred form of tro'l thcstarting resistance. These switches are' provided with auxiliary switches by means of which'when one of said resistance switches is closed, it'completes the'circuit of a v succeedin switch. Accordingly the switches. 1

are close successively. 7 {The circuit of the operating winding "of'each switch is further controlled by means of an electro-magnet- ,ically operatedrelay switch, there being an motor armature. Accordingly if one of the inde endent relay switch foreach operating win mg The operating, winding of each re-- lay switch is connected in circuit in series between its preceding. resistance switch and the switches closes, the operating winding of the succeeding switch is connected in circuit, and

- if the current is abnormal, said relay switch will respond and prevent the next resistance switch from bein- 'closed., The operating winding of each re ay switch is so connected incircuit that when its corresponding restance switch is closed it is short circuited, and

I provide a main switc 1 which is operatliereby rendered inoperative solthat it cannot cause'said switch to open.

' In order to more particularly set forth the characteristic features ofl my' invention, I- I shall describe the controller which is diagrammatically illustrated the accompanylng drawings and exemplifies my invention as it may be embodied in ractice.

. es will respond-successively'and the pgogressiye oppration of- -said switches meansof electro-magnetic windings 6, 6 and 6 respectively. The resistance switches 5 and 5 are provided with auxiliary contact 7 and 7 a respectively. The resistance switches 55, 5 and 5 control'r'c'sistance sections 8, 8

and 8 respectively. The resistance switches I 5, 5 and 5* have associated therewith relay switches '9, Wand 9 respectively, which are operated by electrc-magnetic windings 10,

i0 and 10*, respectively adapted to respond to a predetermined current.

The motor may be of any suitable type. I have illustrated a series wound motor having an armature 11 and a field windiin 12. A

switch 13 may be placed in the line from which power is obtained.

I shall now describe theoperation of my controller. r

If the hand switch 3 be closed the winding '2 will be energized, and accordingly the main switch 1 will be closed. The motor circuit is thus completed from the positive line through conductor 14, main switch 1,

conductor 15, relay winding 10, resistance.

8, 8 and 8 conductor 16, armature '11, field winding 12 and conductor 17 to the negative line. Accordingly the motor is started with all the starting resistance in circuit. WVindings 6, 6 and 6 are connected to the negative line by means of conductor 18. hen the main switch 1 is closed, windingfi is connected to the positive line through auxiliary contact 4, and relay switch 9. Accordingly it will respond and close resistance switch 5 which will short circuit resistance 8 and winding 10 and connect relay winding 10 in circuit. Theresistance switch 5 will not be closed ifthe current in the motor circuit be abnormal, as the circuit of-the-wmding 6 will be opened by the relay switch9, while the current is abnormal, the relay switch 9 being opened by the relay winding 10 which is connected in series withthe motor and, adapted to respond to a predetermined current. 'As,s0on as the motor current sub sides toa normal amount, the relay switch 9 will close and then the resistance winding 6 will be energized and the resistance switch 5 will he closed.

its

If the current becomes abnormal after re? sistance section 8 is removed from circuit b resistance switch 5, the relay winding 10 respond and open relay switch 9, ening the circuit of windin 6, As soon as t e cur rent becomes norma the relay switch 9 will be closed and the'n winding"6 will be connected to the positive line through relay switch 9*, auxiliary switch 7, resistance switch and main switch 11 When switch 5 is closed relaywinding is connected in circuit in series with the motor armature and resistance 8 ,-;.and the relay winding 10 is short-circuited. If the current be abnormal relay winding 10 will respond and open relay switch 9', thereby opening the circuit of winding 6 and preventing resistance switch 5 from closing. .As soon as the current becomes normal relay switch 9 will close and winding 6" will be connected to the positive line. through relay switch 9*, auxiliary contact 7 resistance switch 5, conductor 19, main switch 1. Switch 5 will now be closed by winding 6? and short-circuit resistance section 8 and relay winding 10 The motor circuit-will then ex end from the ositive line through conduct 14,mainswitc 1,con ductor 19, switch 5, conductor 20, conductor 16, armature 11, field winding 12, conductor 17 to the negative line. The resistance switches thus operate sucessively to remove the starting resistance from circuit; step by step.

switch next in or er of operation, would be arrested by its COIIBSPOIldlIlgIGlfiY switch,

Inasmuch as each switch, when it is closed,

short-circuits its corresponding switch it is rendered independent 0 any subsequent abnormal increase in current, and accordingly the switches that have been closed will not be opened, and the switch next in order of operation will be prevented from closing,.in-

asmuch as the circuit to its corresponding recessively, a plurality of resistance sections controlled by said switches, a. plurality of electromagnetically operated relay switches, one for each of said resistance switches and each being connected in circuit to control the circuit of the operating winding of its corre-- s ponding resistanceswitch, and electrical con-: nections whereby the o crating winding of each of saidrelayswitc es is connected in circuit in series with the motor armature If the-current becomes abnormal at any stage in the rocess, the closure of the" each adapted to control the operating wind-f ing 'of its corresponding resistance switch,

and electrical connections whereby the operating windin of'each relay switch is connectt ed in ircuit in series with the motor armature the resistance switch that'precedes it in order of operation 'and is short-circuited by its corresponding resistance switch.

3. In a motor controller, in combination, a plurality of resistance switches,a plurality of operating windin s one for each of said switches, a plura ity of resistance sections controlled bysaid switches, a lurality of.

electro-magnetically operated re ay switches one for each of said resistance switches'and each connected 1n clrcuit to control the c1r'-' cuitv of the operating winding of its 'corresponding resistance switch, and electrical connectlons whereby the closin of each resistance switch'eloses the circuit-through the operating winding, of the nextfsucceeding resistance switch, connects the operating winding of the corresponding: relay switc thereof, in-circuit in, series with the motor armature,

and short-circuits; its own relay switch. I

4. .In a motor controller, in combination, a plurality of electroema sistance switches, a plurality of resistance sections controlled by said switches, a plurality of electro-magnetically operated relay switches, one for each of said resistance switches'and each adapted to control the operating winding of its correspondin resistance switch, electrical connections w ereby the operating winding of each of said rela switches is connected in circuit in series wit 1 the motor armature by the resistance switch 'netically operated rethat precedes itin order of operation and is short-circuited by its corres onding resist ance switch, and a mam swltc for closing the armature circuit adapted to close the circult through the o erating winding of the relay switch control ing the first resistance switch.

In witness whereof, I have hereunto sub-- scribed my name in the presence of two w1t-,

nesses.

- CLARK 'l. HENDERSON.

Witnesses: I

FRANK Il. HUBnnRD, ALEXANDER H. Moonris-

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