US986277A - Motor-control system. - Google Patents

Description

E. L. GALE, Sn.

. MOTOR CONTROL SYSTEM. nruouxon rimzn 1111's 20, 1910.

986,277, Patented M117, 1911.

2 SHEETSBHEET 1.

E. LJGALE, s11. MOTOR GONTROL SYSTEM;

' APPLIGATION FILED JUNE 20, 1910. 986,277. i r d M r-- 1.

2 SHEETS-SHEET z.

all whom it may concern:

1 Arr-monumentcrrrynnwfmnsnrh conrons'rron or new Jnnsnir.-.

Specification of Be it known that I, Ennns'r L. Gene, Sr, a citi-zen'ofthe United States, residing at Yonkers,- in the county of Westchester and Statejof :New York, have invented a new Q'an'd useful Improvement in Motor-Control Systems, of which the following is a specifi- F catiom.

' provide means for the starting and a'cceleris started with a load. I

Inthe accompanying drawings Figure 1 My invention relates tothe cont-rolling electricmotors, and-one. of the objects is to a'ting' of a n el ectric motor under' various conditions and particularly when the motor shows my invention applied to a motor which operates anelevator; Figs; 2, 3, 4, 5

and. 6 show various modifications in the connection and arrangementof certain accelerating devices all of which are contemplated .Iby my invention.

f well "known arrangement ofthe "motor M," ibrake B and tractiondrum Dare shownin -25,'connectioi1 withthe elevator car 0 and the Referring more particularly to 1, a

I counterweightW." The controller switch in the can is operable to close a circuit e-athrough reversing switch R or R and there- .by toijmpel the motor-M in the corresponding-,.directionof rotation. The; main switch S is. to -open and close-circuit connections withthecurrent supply mains.

The starting and accelerating, apparatus for-the motor M will nowhe described Res'i'stances 16, 17 l8 vand 19 are-connected in series ,Withthe motor series field, only the.

leads? 20' and .21 oi the latter being shown. ":These resistances,-=1ncluding the seriesfield, v are automatically cut out by. means of the electromagnetic switchdevices *11," 12 13,

1 l4 and 15, respectively, the-magnet windings i-thereof preferably beinglconnectedin series, 1

one connection. being made through conduc- =tor '22, resistance 24, a portion" of resistance 455 fnectipnsto one side of the motor armature,

.ithe otherfconneetionbeing inade by way of conductor 23, auxiliary contact 25 or 25 to 1 9, and thence" through the reversing con;

' said magxilet vfvin dings are, connected in,

series :wit

theresistance 24 anda portion oiresistance 19, all in parallel or around the.

motor arm'aturemnd adapted to dependfor Application filed me 20; 1910.; Serial no. sez'rvei tsetseean, sn;,--or Yonxnns, new onm essmnon' 'roo'nsnnnvnron; conmat;

.energization upon thedro p of potential-in the motor armature;

relatively high temperature coefficient, and as currentcontinnes to flow therethrongh,

dinaryfacceleration' of the "niotor-M' the ac.- celerating magnets will *elose v in succession event the starting current flowsIor-"a time through the starting -resistances'm'and the high teinperatnre coefiicient resistances is increased. To the terminals of these resistwindings 27iand 28 which control'thg-.- ir cuit closing devices 29 and gores'pectiveiy,

when the ohmic resistancesofthe high tern- 29 is first 'operated -The operation of this device vn nites the contacts 31 and' Bil-fend closes a circuit in parallel "with -the 1" esist ance 24. This parallel circuitis"" traced through conductor" 37, contaict' 33*,"contluc 't01" 36, contacts 31, 32,- resistance 35,contact point 19. This.allowsmore currentto flow in, the accelerating magnets andthe; increased current. may be snfiicient to energize-{the magnetw'inding for switch device .11.. After this switch device 11" has, opetat dfiffjthe load onlthe motor still so great as re prcvent further accelerationf ofi the" 'mdtor,;-'pthe current. flowing through "the-"high 't'eiiiperattire coefficient resistance. :11 {W llincrease the ohinicresistance' to; size an extent that the magnet WindingZSconn minals thereof will receive sufll" to cause the op 'r-ation of th'eci device 30, thereby joining the "and 34. This latter operationfsh n the resistance 351and places the. resistance :24 and-a res stance 19 the ohmic resistance increases;--" In. the or.

to cut out portions of the resistanceghutan;

series field, andthe ohmic resistance 9f the;

ances 16 and 17. are? connected ths'iiiagnet perature coefficient resistances have increased toe predetermined limit "and are .so adapted and adjusted that the circuitclosing-device 34,' "conductor 38,-;par't of resistance 15; tof' the Resistances 16'and 1 7" are-sues as have. a

.75 and when energized, 'eflectthe joining of contacts 31 and;32, andflfand-file luhese- Inagnet windings 27 and 128receive-'sufiicient current operatively to energize thenrfjonly magnets. The efi'ect of this is materially to increase the currentthrough the said magnet windings and to effect the closure of the ther increased.

next accelerating-magnet 12, which, in turn, will cause the speed of the motor to be furto'r' is loaded beyond its capacity, the acceler ation effected bythe'successive, operation of the accelerating magnets 13, 14 and .15..

Thereafter, unless the mo- Thus it is seen that the acceleration of the motor lightly and heavily loaded is entirely ant-.nnatic, and for the loaded vconditions the operation of the auxiliary magnets 27- wan-128 is.,- automatically selective as to wl ether one or both of the said magnets will operate.

In-elevator ap arat-us it is desirable that for light loads the maximum speed and of the auxiliary magnets are contemplated by my invention and" Figs. 2 to 6, inclusive,

,. show some, ofthe most evident embodiments thereof. In Fig. '2 an acceleratingmaghet '40 is connected around both of the high 1 icmperature coeflicient resistances 16 and 17 in series and the 'contacts 31" and 32", and

ordinary way when the potential drop across the two resistances 1n series reaches a preand 34', are joined in succession in the.

determined value. -Fig. 3 shows'the twomagnet windings 27 and 28 connected inparallel across the two resistances 16 and 17 an'dtso}, designed that-they operate invthe .PI'OPBIi SU CCGSSlOIL In-Fig. 4. one'magnet windingf27 is connected around resistance 16, and the other magnet winding 28 is 17 in series. v Or the two magnets 27' and 28 may be connected in series (Fig. 5) or in parallel (Fig. '6) around one of the high temperature coefficient resistances. In other respects the contacts, resistances, and con nections are the same or similar to those shown in the preferred embodiment (Fig.1). Although I have thus shown and de scribed my invention, I desire not to be limited to the construction, combination and arrangement herein set forth, as it is evident that' those skilled in the arts to which this invention appertains may make various changes without departing from the spirit and scope thereof.

What I claim and desire to secure by Lettors Patent of the United States is 1. In motor controlling. apparatus, the

combination with an electric motor, of sec- -t1onal starting resistance therefor, parts thereof being of relatively high temperature connected' around the'tworesistances 16 and coeflicients, electro-responsive accelerating creaseo't potential drop in said high temdevioes, and means dependent upon the in thereof being of a relatively high temperaperature coefiicient resistances to effect successive sti'engtheningof the said accelerating devices.

2.111 motor controlling apparatus, "the combination with an electric motor, of sectional starting resistance therefor, parts thereof being of relatively high and low. temperature coefficients, means for cutting out said resistance, gradually as .the motor increases in speed, and means dependent upon increase of potential drop in said high temperature coeflicient resistance tending successivelyto expedite the operationof said cutting out means.

3. In motor controlling apparatus, the combination with an electric motor, of sec tional starting resistance therefor, parts thereof being of relatively high; and low temperature coefficients, means for cutting out said resistance gradually as the motor increases in speed, and means dependent upon increase of potential drop in said high temperature" coefiicient resistance tending successively to expedite the-operation of said cutting out means when the motordoes not.

1 start or does not increase in speed sufficiently to cause the operation vofsaid cutting out means? r I 4. In motor controlling apparatus, the combination with an electric motor, of seetional starting resistance therefor, parts thereof being of relatively high and low temperature coefiicient's, 'electro-responsive resistance cut-out devices dependent for operation upon the speed of the motor, and electro-responsive magnets dependent for 'energization upon the increase of potential drop in said high temperature coefiicient resistances and operative successively to strengthen the energization of the electroresponsive, resistance cut-out devices.

5. In motor controlling apparatus, the

combination with an electric motor, of sectional starting resistance therefor, parts ture coefiicie'nt, electromagnetic resistance cut-out .devices to short-circuit portions of the starting resistance, and means dependent upon the variation of potential across the high'temperature coefficient resistancesauto matically .to effect successive strengthening of the said electromagnetic devices. -6. In motor controlling apparatus, the combination with an'electric motor, of-sectional starting resistance therefor, parts 12 thereof being of relatively high temperature coefiicient, electromagnetic resistance cut-out devices connected across the motor armature, and magnets connected to the terminals of the high temperature coeflim cient resistances operative selectively to increase -the magnetism-of the said cut-out devices when the load on the motor is large.

7; In n1otor; controlling apparatus the I combination with an electric motor, ot sec- 9 tional starting resistance therefor, parts thereof being of relatively high temperature coeflicient, electromagnetic resistance 'cut-out devices connected across the motor armature, and magnets connected around the high temperature coefficient resistances operative selectively, automatically and successiyely to strengthen said electromagnetic devices when the load on the motor'exceeds c a predetermined i'aiue.

8. In motor controlling apparatus, the combinatlon of an electrlc motor, acceleratmg magnets, resistance in series with said accelerating magnets in a circult across the motor armature, sectional starting resistance, 'SGCtlOIlS thereof bemg of high temperature coeiiicient and connected in series, electromagnets connected to the sections of high temperature coefiicientresistance so as to be dependent for energization upon the drops of potential in said sections, and switches operated by the electromagnets'after currentfflows through said sections a predetermined. length of time successively to reduce the resistance in series with the accelerating magnets.

9 In motor controlling apparatus, the

combination of an electric motor, accelerating. magnets connected in series, resistance in series with said magnets in a circuit connecteddirectly across the motor armature, starting resistance in series with the motor armature, sections thereof being of comparatively high temperature coefiicient, additional resistance, amagnet connected to terminals of one of saidsections. and operative to insert the additional resistance'in parallel with the first named resistance when the motor does not accelerate with a prescribed-load, andv another magnet connected, to terminals of another of said sections and operative selectively to further increase the energizing current intlie said accelerating magnets. p

In testimony whereof, I- havesigned my name to'this specification in the presence of two subscribing witnesses.

ERNEST L. GALE, sR.

lVitnesses EDWARD H. STEELE, GEORGE D. ROSE.

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