US584856A - davis - Google Patents

Description

(No Model.) Sheets-Sheet 1. H. P, 1 mm CONTROLLER FOR ELECTRIC MOTOR$;

No. 584,856. Pafmnted June 22, 18%".

H ...J w I (No Model.) a 7 2 Eheets-Shee; 2.

EAT/IS.

CONTROLLER EOE ELECTRIC M0E@R$.

No. 584,856. Patenzzad June 22, 189?:

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m Model.)

w 4 SheetsSheei; 3. H. DANS.

GONTBOLLER FOR ELECTRIC MOTORS.

Patented June 22," E89?" llf i J LII-1', I h L WITNESSES: IWVENTOI? By W whrromve Y.

end f the drawings, 1

' UNITED SAME PLACE.

3 N T Fill? L. F3

$PEQIFICATIGN forming oann o 5 Patent file. 5

f June Application filed (lei-ohm 23, 1396. Serial No. 510,332. i170 zumlel.)

trio motors, and more portienls of this class which are emplo; iaion with motors utilized for operable elevetors.

The object of my invention ire provide a controller which is simple e-onstrnebion, effective in operation, and readily manipulelperl, nncl onewhieh will serve to automotienlly encl gra l ually short-eirenii; line slinrtin resietenee, which will short-ennui; the netn ating'inenne for the resiSeance-swine hen it has done its Work, and Whieh will the qniel: return of the resistance-Sr its initial posiiion'when the "main circuit is open.

in the accompanying drawings, Figure l is a plan View of a stepping, starting, and re versing" switch forming-port of my controller mechanism. Fig. 2 is a transverse seetion on line a; a: of Fig.1. Fig. is a diagram of the controller switches and circuits. Fig i is a plan view of the variable resistance and i he controlling mechanism therefor, the flange .{it the front side at the top of the frame hei ng' broken away in order to more clearly (lisclose'the operative parts of the cleriee. Sis a front elevation of ihe'reeielzinee and the eonii'ollingewitch therefor. Fig. 6 is Vertical section taken on line g/ 1/ of .i ig'. 5.

Referring now particularly to Figs. 1, 2, is a base p ovided with bearings 2, in which is mounted 2i shaft This shaft has rigidly nieuniecl upon it n drum i, provided with eonineeslrips 5, 5, (i, 6, 7, and 7. The eontaieteirips611ml 7 are electrically connected, as are also the strips (5 and 7,'niul the strips Crnnll 5 extend eonipletoly -eround the drum. Snitnhl'e stal ionzu-y contacts 8 engage the conflict-strips above ho spaces h ihe n the strips (1 and they ore hriilg'el'l l. i ionnry e'onlncn S no iill Upon the illllill, near the "th reof, are mounted. eon

drum is 1 eat respective end: toot pieeee or nrine 9 and .l=,,whieh project some little lisionee therefrom. Lively, with stationery comers Each of the eontacls l0 illlll i is partially FilllTOllfidCll by the pole- 1. of no eleeiironmgnes, the coil. 1E3 which included in the main circuit. The objee these magnets is to rupture any ores whicl may he formed. when the Circuit in interrnpied by the and 9 and 10. r

i. he shaft 3 will preferably be opcrnteci from elerelronenr by means of n corcl and pillleye, (not she/Wm) en rntne- The oneintion of this switch will be hereinafter more fully described in connection with "anal. ofthe o ne'rcont-rollin i'ieos.

Referring now to Figs. {l and 5 in nonneeiion with S, 13 in 2iresisunnee-colninn coniprieing eir. elements or parts a, Z), c, (I, e nndf, preferably of the construction set forth. in any Paien'bNo. 513,457, granted January 23, LSQ-l. The .rcsisinneeeolnnin 13 is mounted in n frznno 1i, and the parts a. fare conneeiecl to two sets of stationary eonlnci's 15, 16, 17,:1ml'l8 micl ll), 20 21, nd. 22, arranged in the are of a circle on the .rrrime 'l-i.

is :i hell-eran-l-:, lei'or pivetnlly mounted upon n hearing Siilhl or post 2i, proje -ting from thclrziine l-l. The free end of the short arm of lever 23 is provided with an armature 28;.Elnil tllfl free end of its long arm in pro.- Viderl with n. long.contact-brush 25, wliieh is of sufiicient length to constitute 21 conductingliridge between two slzitionary-contacts which are not in the some set-null which are separniell'by two or more inlervening contacts. [in auxiliary eoulnotbrush 26 is nioniiell npon lever '33 and is'elecirivzilly niul mechanienllyjoined to the brush 25. The brush 26 is so lOCll-Ul with reference 10 the brush 25 separation of the conl'ee'is 9 anal 10,

is usnnl in such :ippn

"hone enthat it will make contact with a stationary contact-piece 27 when the resistances are all short-circuitcd... A second bellcrank lever 29 is pivotally mounted upon the stud Z-l independently of the lever 23.

The inside of the long arm of the lever 23 "is provided with a-lug 23, and the adjacent side of the corresponding arm of the lever 29 is provided with a corresponding lug 29, located behind the former. The long arm of the lever 23 is connected to the frame 14; by a coiled spring 30, and thecorresponding arm of lever 29 is connected to the frameby a similar spring 30. A stop lug or post 31 projects from the frame 1% in position to be engaged by the lever 29 when it is retracted by its spring. v

A solenoid 32 is mounted upon the frame ll, and, as shown in the present instance, a portion of its casing formsan integral part of such frame. Asmall magnet 33 is mounted above the solenoid 32 in position to attract and hold the armature. 28 when the latter is brought within its magnetic field The core 34 of the solenoid 32 is loosely attached at its upper end to the free end of the adjacent arm of lever 29 byaslot-and-pin connection. The rod 34, constituting a continuation of core 34, extends through and is fastened to a dashpot plunger 35, which is provided with passages 35. or more small holes 35, is loosely mounted upon a bushing 35 which surrounds the lower end of rod 34. The dash-pot cylinder contains a suitable liquid for retarding the movement of the core by the solenoid 32.

It will be understood from this construction that when the circuit through the controller is closed the solenoid-core will be attracted and therefore moved downward. The rapid movement of the solenoid-core which would otherwise result is prevented by the dash-pot, the. disk 35 being moved upward by the liquid'in cylinder 36to close the pasages 35 when the solenoid-core is'moved downward, and thus preventing the passage of the retarding liquid except through the small openings 35. As the lug 29 on the lever 29 is bchind the correspondinglug 23 on the lever 23, the former will engage the latter and gradually move the brush 25 over the stationary contacts 15 to 22. When the limit of the stroke is nearl y reached, the armature 28 will be within the field of the magnet The further movement of the lever 23, which serves to bring the auxiliary brush 26 into engagement with the stationary contact 27,

will therefore be effected by the magnet The solenoid 32 being shorteircuited by means of the brush 26 and the contact 27 the core 3at will be released and the retractingspring will draw the lever 29 and the core at back to their original positions, the movement being comparatively rapid on accountof the opening of the passages 35 by the depression of the disk 35. As the magnetld A thin metal disk 35, having one the course above indicated the solenoid.

rupted.

r The operation of the entire a iparatus isas follows: Assuming that the parts olf both switches are in the positions indicated diagrammatically in Fig. 3-; ot' the drawings and the motor to be controlled and. its load therefore at rest, if the shaft 3 be turned by any convenient meanssuch, for example, as apulley and a cord or chain extending within reach of the operator, so that the contactstrips 6 and (i are brought into engagement with the corresponding stationary contacts 8 and the contact-arms 9 and .l into engagement with the respective stationary contacts 10 and 10, as indicated in Figs. 1. and :"3--thc circuit thron h the motor will be closed and the c also or the current will be as follows:

through the conductor or, the coils 112 of the arc-rupturing magncts,the stationary contact- 10, the contact-arm 9, the contact-strips 7 and 6, the stationarycontact 8 in engagement with the latter, the ll'lOllOY'ZtlIllEthlli'O 38, the magnet33, the solenoid 32, the stationary coir tact 22 of the resistanCc-switcli, all oi the resistance 13, the stationary contact 18, back to the contact-strip O, 'hrough the corresponding stationary contact 8, across to the cont actstrip 7, and thence through the contact-arm 9, the stationary contact 10, and out through the series winding 39 of the motor fieldmagnet.

Where a motor having a compound-wound field-magnet is employed, as indicated in the drawings, the shunted current passes from the contact-strip 9 to the strip 5*,tl1cuce to the corresponding statiimary contact 8, through the shunt-winding -10 of the motor to the strip 5, and thence out through the contacts 9 and 10 and the series winding 89.

By reason of the construction of the reversing-switch hereinbcfore described,whereby the middle contact-lingers S are always in contact with either the strips (3 and (5 or the strips 7 and '7, the circuit which. inclurfles the shunt-winding 40, the armature 38, and the resistance-switch is maintained perinanently closed, all danger of breaking down the insulation of .thc shunt-wind ug being thus substantially avoided.

As soon as the current has started through 32 will obviously draw down its core against the action of the ret-racting-spring and the dashpot, and by reason of the impinging ol the lug 29 on the lever 25) against the mrresponding lug 23 on the lover the contact-brush will be moved over the stationary contacts in such order that in its second position it will bridge the contacts 16 and 19. position, the current will pass through the re sistances f, e, and I], the stationary contact 19, the brush, the resistances h and a, and

thence to the stationary contact 8 i 11 en IIC ing a reversing and cnt-ontswitcli in combination With variable resistance exude ries of stationery contacts therefor, a movable arm provided with a contact for making engagement with said stationary contacts and with. {L11 armature, a holding-magnet for said armature, a main solenoid, a movable arm provided with a core for snidsolenoid and with means for en gaging and moving said contacteztrrying arm, means for retracting said arms independently, means for retarding the forward movement of said arms and means for si1ort-cireniting the main solenoid When the final resistance-contact ie reached.

5. In a controlling mechanism for electric motors, the combination of starting. resistance, with a controllingewitch therefor comprising a series of stationary conn startii'ig, stoppin and reversing switch and a variable I tenets; 2L eoepernting movable contract mi lever provided with an nrnintnre, :1 hi for retracting said ZHHXOI lever, a second mm or lever provided with {Lil armature and r means for engaging and moving said ll] 11am ed @1121 01 1e ver when positively actuated, '3 spring for retracting the second arm or 1e" V61, means for retarding its positive movement, an electromagnetic coiifor each 21mm tnrc and means for short-circniting one or them when the resistance is all short-circnited.

In. testimony whereof I have hereunto sni scribed my name this 14th day of September, A. D. 1896.

rfitnesses: WESLE Gr. Gnnn, HUBERT TENER.

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