US885476A - Motor-controlling system. - Google Patents

Description

PATENTED APR. 21, 1908.

No. 885,5.16, A. nnoensnn & v. 0. STROBBL.

MOTOR CONTROLLING SYSTEM. APPLICATION nun JAN. 14, 1901.

' ("I'm I i g w 0 Mfl I ,Q Witnesses: W g I Inventors "VQ13'0W UNITED STATES PATENT OFFICE.

ARTHUR E. ,HOGBEBE AND VICTOR- O.

STROBEL, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNORS TO N ILES-BEMEN 'lT-PON D COMPANY, OF JERSEY CITY,

NEW JERSEY.

MOTOR-CONTROLLING SYSTEM.

Application filed January 14, R307.

Specification of Letters Patent.

Patented April 21, 1908. Serial No. 352,298. I

To all whom it may concern:

Be it known that we, ARTHUR E. Hosanna and Vroron O. STROBEL, citizens .of the United States, residing at Philadelphia, Philadelphia county, Pennsylvania, have invented certain new and useful Improvemehts in Motor-Controlling Systems, (Case A,) of which the following is a specification.

, This invention relates to a controlling system for motors requiring. to be frequently started and stopped and reversed as, for instance, where a metal planer is operated by a reversing motor automatically,controlled by the planer dogs to produce a slow cutting travel and fast backing travel for the table. In the present case we have chosen to illustrate our invention as adapted for application to a planer of otherwise ordinary construction. 1

' The invention win be readily understood from the following description taken in connection with the accompanying? drawing which is a diagram illustrating our system, the detailed parts being shown conventionall In the drawing :A, indicates one supply main: B, the-other supply main, the mains .being assumed as having a usual main switch:

C, the motor field: D, the motor armature:

the shunt circuit through the field, constantly connected with the mains and energizing the field: F, a first rheostat, always in theshunt field circuit: G, a second rhcostat adapted for connection with the shunt field circuit in parallel with the first rheostat: H, a short circuit across the armature: I, a rheostat in this short circuit: J, a normally oen switch in the armature short circuit:

an electromagnet in the armature short circuit: L, the armature lever of magnet- K, carrying the switch J, and tending, when moving in the direction of attraction of magnet K, to close switch J: M, a second electroinagnet operating on the same armature lever and tending, when energized, to hold switch J open against the resistance of a spring tending to close it, this second electroi'nagnet being in the main armature circuit: N, an auto-- matic regulating rheostat in the main circuit of 'the armature: O, a solenoid in the main armature circuit: P, cuit: Q, a normally closed switch in this circuit, this switch being opened by the action of solenoid 0:, It, a solenoid in this circuit to cooperate with rhcostat N: S, springs acting so adjusted as,

a shunt of the field ciron certain moving parts: '1, the main armature circuit: U, a whole, illustrated as a sliding structure: V, the usual reversing tumbler ot a planer, connected with the controller to shift thecontroller from oneto the other of its two positions: W, a series the controller: X, contacts carried by erating with the fixed contacts when the motor is at high speed and the planer table making its backing stroke: and Y, a pair of movable contacts carried by the controller and cooperating with the fixed contacts when the motorv is at slow speed and the planer tabie making its cutting stroke.

First rheostat F always in the field circuit is to be adjusted to give the motor the proper high speedsuited for the fast backing stroke of the planen Secondrheostat G, in'parallel with the first 'rhe'bst'at when the planer is making its cutting stroke, is to be adjusted to give the armature the slow speed suited to that stroke. Short circuit rheostat I is to be when in closed circuit, to bring a suitable braking load upon the armature. 1

In the drawing the tumbler is in the usual position in which it has planer table at the end of the cutting stroke in'bringing about the reversal of table motion and the armature is turning at its high a series of four movable speed and in direction corresponding with backing motion of the planer table, and the table is on its fast backing stroke. The rate of the backing speed may be adjusted at first rheostat F. When the tumbler is reversed then the controllenin rewrsing the motion of the armature, puts second rheostat G in parallel with the first rheostat in the field circuit; and the slow speed for cutting may beadjusted by means ofthis second rheostat.

Thetwo rheostats F and G are adjusted by hand to suit the intended working conditions, that is to say, the intended cutting and backing speeds of the planer table.

Taking the conditions as illustrated in the drawing the operation would beas follows First: Field circuit'is' through first resistance F; armature short circuitis open'at switch J; this switch is held open by magnet M energized by the main armature circuit; armature is running in backing direction] at backing speed; planer table is making its of six fixed contacts for.

the controller and coopbeen put the froni the positive main through rheostat F during the reversal, and at reversal the field current is again through firstresistance alone.

Fifth: Switch Q is to have been adjusted to the proper load limitations of the motor; all regulatmg resistance will be in when the motor is starting; it willbe quickly cut out by the action or solenoid R; (luring reduction of resistance the current may exceed the predetermined amount then solenoid O o ens fast bacl-zin stroke and moving to the left relative to the tumbler.

The field circuit is l and the motor field to the negative ma n.- The main armature circuit is from positive main A to contact pointto controller 3 segment X- -to controller segment to magnet M, to solenoid through variable resistance Nand itsrheostat arm, to the armature and from the armature to contact point W controller segment )3, thence to recontroller segment X and to negative main sistance N is immediately cut in; switch Q B. The shunt circuit commencing at posicloses when obstruction past; resistanceits backing stroke, moving magnet M is slightly energized and tends to turns in cutting direction at slow cutting tive contact YV goes through segment X, contact N switch Q which is closed, solenoid R and to the negative main.

Second: The planer table nears the end of to the left; it engages the tumbler andshifts .it somewhat to the left; the four moving contacts X of the controller leave the fixed contacts; all contacts of the controller are therefore momentarily open; the circuit through the field remains closed; all other circuits are open; the armature is turning by momentum in backing direction in the energized field, magnet .\l is dcnergized',switch J is closed by its spring; short circuit ll is closed across the armature; the armature now acts as a gen, erator; short circuit rheostat 1 brings a load upon the armature tending to slow it and stop it; the armature stops or slows down suiliciently for safe reversal of current; the armature-stopping load in the short circuit is to have been suitably adjusted at short circuit rheosta't 1.

Third: Table has completed its backing stroke tumbler has moved 'clear to the left; controller is, moved to the left; contacts Y cooperate with the fixed contacts;

reduction at N may then continue.

The controller has been illustratedas an automatic or machine-operated device, but it is to be understood the controller'refcrred to in the claims does not necessarily involve machine-moved or automatic switching devices.

It is to be understood that the illustration is exemplifying only, many variations in ar- -rangenient beingobvious' to those skilled in the art. We have simply explained the principle of our invention and the best mode in-wluch we at present comtemplate applying that principle.

. We claim:

1. A motor controlling system comprising a motor field, an armature, supply connections for furnishing current to the field and armature, a short circuit across the armature,

a normally open switch in said short circuit, means for operating said switch at or before reversal of armature current, a pair of rheo- 10o stats in parallel in .the field supply connections, and a controller adapted to reverse the direction of current in the armature and to alternatively bring one or both of said rheostats into action, combined substantially as set forth.

2. A motor controlling system comprising \switch Q; solenoid R is deenergized an open switch J magnet K is strong but losing strength; magnetKis acting through shorter a motor field, an armature, sup ly connecair gap than magnet M; switch 3 remains trons for furnishing current to t e field and closed till magnet K weakensand magnet M strengthens sufficiently to open the switch; main current is now in reverse direction through armature;' armature short circuit is open; field is energized by current through both rhcostats F and G in parallel; current through field is thereby increased; armature armature, a controller for reversing the direction of current in the armature, a short circuit across the armature, a normally open switch in said short circuit, means for closing said switch prior to and during reversal, a rheostat in the annature-supply circuit, 1L5 means for automatically putting said rheo stat to maximum resistance, an electromagnetic device controllin said rheostat, a normally closed adjustab e switch controlling said electromagnetic device, and an elect-romagnetic device in the armature sup ly circuit cooperating with said switch'an tending' to open-it, combined substantially as set forth.

speed. The circuits for forward runnin are as follows: The field is partly supplied rom the positive main through resistance F and partly through the positive main throu h fixed contact segiiient Y, contact and resistance G. The main armature circuit may be traced through'the line T in a I reverse direction to the course described for 3. The combination .of a field, means for backward running. The shunt circuit? is supplying the field through a single controlbefore described. ling device for one direction of rotation of the Fourth: Attire end of the slow cutting motor and through two controlling devices stroke a reversal is affected as before, the arfor the other direction of rotation, a main armature snort circuit being closed prior to and. mature circuit including a magnet, and an magnets and arranged to aguars-s armature short circuit includin a magnet and a single switch controlled iv the two. open and close the armature short circuit.

4. The combination of a closed field circuit, an= armature circuit including an electro-magnet; a solenoid and a rheostat, an armature short-circuit including 'an electromagnet, a switch controlled by the tvifp-electro-Inagnets and arranged'to 0 en and close the armature short-circuit an a shunt circuit including a switch arranged to (:Fen'and close the shunt circuit and actuate by the solenoid of the armature circuit and a shunt solenoid arranged to actuate the rheostat.

5, The com ination of a closed field circuit, an armature circuit including anelec- V armature short circuit, an

tro-Inagnet, a solenoid and a rheostat, means for reversing the armature circuit, an arma ture short circuit including an electro-magnet, a switch controlled by the two electromagnets and arranged to ogen and close the including a switch arranged to o the shunt circuit and actuated y the solen- 01d of the armature circuit and a a shunt. circuit en and close shunt solenoid in the shunt circuit arranged to actuate the rheostat.

6. The combination of a closed field circuit including a regulating device, a second field re ul'ating device, a main armature circuit ingluding an electro-magnet, a solenoid and a rheostat, a controller for reversing the;

field circuit, said controller'having'means for placing said second regulating device in the armature circuit in onedirection ofo era- 'tion and for cutting it out in the other irec- Y the solenoid of the armature circuit, and a ,solenoid in the shunt circuit arranged to 210- tuate the rheostat. I

ARTHUR r HOGREBE VICTOR 0. 1772* Witnesses: A f

H O. ALLEN,

WM. H. Km xarn.

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