Patented Aug. 15, 1922.

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1 H, D, JAMES MOTOR CONTROL SYSTEM. 1,42,67. APPLICATION FLED NOW,, 19. Patented Aug. 1, WITNESSES:..INVENTOR featy D. Vanizes AT TORNEY

2 O lowing is a specification. My invention relates to motor-control sys stems and it has particular relation to motors employed to operate, skip hoists, especially those that are subjected to variable loads.. One objects my invention is to UNITED STATES PATENT fice. BIENRY D. JAMES, OF EDGEWooD PARK, PENINSYLVANIA, AssIGNOR. To WesToG House ELECTRIC. & MANUEFACTURING conpany, A coaroratior errorsy WANA 1,42,67. OTOB-CONTROL syster. Specification Letters Patent. Patented Aug. 1, Application fled November, 19. Serial No. 491,888. To all whom it may concern: Be it known that I, HENRY D. JAMEs, a invention; citizen United States, and a resident Fig.2 is : a schematic view motor Edgewood Park, in county Alle control system shown in Fig. 1;,,, gheny and State Pennsylvania, - have in Fig. 3 is a sequence chart well-known vented a new and useful Improvement in form for contactors shown in Figs. 1 Motor-Control Systems, which fol and 2; Fig. 4 is a view, partly in elevation and artly in section, apparatus employed in 60 1, and. Fig. is a schematic view a modified form control system embodying my in vention. - provide an automatic device which will pre Referring particularly to Figs. 1. and 2, 8 vent a skip a hoist from traveling below a motor 1, having an armature 2 and a shurnt 8, cities, especially near field magnet winding 3 is energized through end its journey. a circuit com rising knife-blade switch In practice, for satisfactory opera and a circuit-breaker. A shunt resistor tion it is necessary to operate skip at a 6, which is also employed for dynamic brak 70 fixed near top and bottom E. may be electrically connected in par hoist in such manner that track: limit relation to armature 2 motor switches will stop skip at proper 1 by a contactor 7..." point. It is difficult to st resistors to A resistor 9 is connected in series rela for different loads such, for ex tion with shunt field-magnet winding.8. 7 ample, as coke, limestone, and iron ore. In A starting resistor 10 is connected in series order to maintain motor at a certain relation with armature. 2 motor, when skip is near top or b6t 1, and portions resistor may be shunt tom a hoist, with variable loads, an auto ed by accelerating contactors 11 and 12. matic device must be employed to compen Amaster controller 1 governs opera sate for loads different weight tion By means my invention, it will be pos circuit breaker contactors. 7, A 11 -control and 12 and de sible for track limit switchés to bring vice 16 is mechanically connected to controller to position for effecting armature 2 motor 1 by a shaft 17 relatively slow operation a motor, when that is provided with a pulley 18 and a belt 8 skip is near end its travel, and, 19 that is mounted reon. The device 16 if skip falls below a pre is constructed in accordance with inven determined, an automatic device will tion Stephen A. Staege, as set forth in a cause motor to increase its. copending application, Serial No. 297 Briefly speaking, my invention consists in filed May 1,1619, and assigned to GE so controlling a contactor for shunting a re inghouse Electrick Manufacturing Com 90 sistor that is connected in series with field-magnet winding a motor, that p e master controller 1 has an f po contactor will be automatically opened by sition and three operating positions, a,b my device when motor falls and c. The controller 1 may be any well below a predetermined and closed known type, such for example, as a drum upon motor becoming : controller. greater For a than better this understanding. The device 16 (see Figs. 1 and 4) is op my inven erated by a small auxiliary motor 21, which tion, reference should be made to ac may be energized from any suitable source companying drawing energy. e motor 21 drives a shaft 22 on which is mounted a pinion 23. The pin FE 1 which is a diagrammatic view a motor-control system embodying my

3 ,67 ion 23 actuates a bevel-gear member 24, which is rotatably mounted upon shaft 10 to negative conductor 0. A shunt cir 2. The belt 19 actuates a bevel gear mem cuit is also established around armature ber shaft 26 which 2. is also rotatably mounted upon and 2 by contactor a circuit 7. comprising shunt resistor 6 Between gear members 2 and 26 is When master controller 1 is actuated 70 a disk member 27, which is likewise ro to its second position b, a circuit is estab tatably h9unted upon shaft 2. The lished from contact segment 43 through con 10 member 27 has a plurality pinions 28 ro tact terminal 3, conductor 4, actuating tatably mounted reon by means pins coil contactor 7 and conductors The pinions 28 are en ged and ro to return conductor 0. The actuating coil 7 tated by bevel-gear members 24 and 26., being thus energized, causes con A metal band or strip 31 surrounds tactor 7 to assume its open position. central member 27 and is maintained in fric In addition, when E. master controller tional engagement re with by means a 1 is in its second position b, contact seg bolt 32 on which is mounted a resilient mem ment 43 engages contact terminal 60, re ber, such as a helical spring 33, a washer by establishing a circuit comprising ac 34, and a nut 3. The bolt 32 is slidably tuating coil contactor 11. The ac mounted in a stationary slotted member or tuating coil contactor 11, being con bar 36.. nected across armature 2, will be ener A contact member 37 is rigidly mounted gized in accordance with counter-electro 8 upon bolt 32 and may be brought into motive force motor 1. When engagement with stationary contact ter counter-electromotive force is sufficient to minal 38. The belt 19 moves in direc close contactor 11, a portion start 2 tion shown by arrows when arma ing resistor 10 is reby shunted. ture 2 motor 1 is operating to raise en master controller 1 is actuated 90 skip. This causes bevel-gear mem to its third position c, contact segment 43 ber 26 to rotate in a counter-clockwise di engages contact terminal 64, reby estab rection. The bevel-gear member 24 is ac E. circuit comprising actuating tuated in a clockwise direction by pinion coil accelerating contactor 12. The 23 motor 21. The and direc contactor 12 is subsequently closed by 9 tion central rotatable member 27 is counter-electromotive force motor 1, n determined by difference in reby shunting entire starting resistor 3 beveled gear members 24 and If master controller 1 has only a When motor is operating above a pre single position, such as c, for forward opera determined, movable contact mem tion; accelerating contactors 11 and 12 ber 37 engages a stationary contact terminal may be adjusted to close in proper sequence, 38, but if armature 2 so in accordance with a well-known practice. 40 decreases that belt 19 drives bevel The motor 1 will now operate at its maxi gear member 26 below bevel. mum for load that it is carrying, gear member 24, i rotatable mem The skip will ascend at corresponding 0 ber 27 will turn in a clockwise direction un until it arrives at a point where, it til contact terminal 38 is no longer en operates track limit switch 41', which gaged by movable contact member 37. will stop motor 1 by opening contactors he operation motor 1 is begun by, 11 and 12 and closing contactor 7. A closing knife-blade switch 4 and actuat dynamic braking circuit is thus formed 110 ing controller 1 from its position to through shunt resistor 6 and contactor 7. initial hoist position a. When master It is, course, apparent to those skilled controller 1 Occupies position a, a circuit is in art, that, if resistor 6 is adjusted established from supply conductor 39 through to reduce motor 1 to a rela knife-blade switch 4, conductors 40 and 41. tively low with a light load, such, for lls track-limit switch 41, contact terminal 42, example, as coke, motor 1 may come to a contact segment 43 master controller stop, 1, contact terminals 46, conductor 47, ac ample, with as iron a maximum ore; for a load, greater such, portion for ex: tuating, coil 48, conductors 49 and 0, and resistor current 6. will n flow through shunt knife-blade switch 4, to supply conductor O tuating 1. When coil this 48 circuit is energized, is established, reby clos ac If re is no compensating means pro vided skip will stop prematurely, when ing circuit-breaker. it is filled with iron ore, or, at least it will The actuating coil 48 circuit travel below a safe and desirable. It breaker, being thus energized, causes is to avoid such occurrences that I have de- 1 tion, circuit-breaker reby establishing to assume a circuit its closed from posi vised present control system. con When armature 2 travels above a pre ductor 40 through circuit-breaker, arma determined, contact member 37 en ture 2 motor 1, and starting resistor gages contact terminal 38, reby establish ing a circuit from conductor 40 through con- 1

4 ,6? said motor upon tact terminal 37, contact member 38, resistor 67, actuating coil 68 contactor 69, and re departing from a predetermined conductor 70 to conductor 0. When this during electrical braking. circuit is established, actuating coil In a motor-control system, combi contactor 69 is Ested reby closing nation with amotor and means for normally contactor 69 and shunting field-cir controlling said motor, cuit resistor 9. The motor 1. means for effecting dynamic braking will be reduced, since energization said motor, and automatic means compris field-magnet winding 3 is thus increased. ing an auxiliary motor and a differential If armature 2 motor 1 travels gear mechanism driven by said auxiliary below a predetermined, bevel-gear motor for accelerating said main motor member 26 will rotate at a slower than upon said main motor falling bevel-gear member 24, below a predetermined during dy reby causing central rotatable mem namic braking said motor, and for de ber 27 to rotate in a clockwise direction and creasing motor when it increases thus separating contact member 37 from above a fixed. contact terminal.38. Under this con 3. In a motor-control system, combi dition, actuating coil 68 contactor nation with a main motor and means for 69 is de-energized, reby allowing con normally controlling said main tactor 69 to open. motor, means for effecting electrical brak When contactor 69 is open, field ing said motor, and automatic means circuit resistor 9 is connected in series rela comprising an auxiliary motor and a dif: tion with shunt field magnet winding 3, ferential gear mechanism driven by said reby lessening excitation re an main and said auxiliary motor for accel thus causing motor 1 to increase its erating said main motor upon. said main motor falling below a predeter In modification shown in Fig., a con mined during electrical braking. tactor 71, corresponding somewhat to 4. In a motor-control system, combi nation with a motor and means for control contactor 69, normally shunts a portion shunt or dynamic braking resistor 6. ling energization said motor, auto When motor 1 falls below a matic means for effecting electrical braking predetermined contactor 71 opens, said motor, and automatic means for re reby inserting more resistance in storing said motor upon said shunt circuit around armature 2 controlling means being so operated that motor 1, thus causing a greater current to traverse armature 2. The motor is determined said motor during departs Ei from braking. a pre reby increased to desired.. In a motor-control system, combi Directional or reversing contactors for nation with a motor, having an armature motor 1 have been purposely omitted because and a field magnet winding, and means for y are well-known in art. Track limit controlling current flow through said switches to prevent over-travel skip armature, automatic means for effecting have not been shown in detail for same dynamic braking said motor, and auto eso. d By employment my invention, it is matic said means field-magnet for diminishing winding upon excitation possible to operate a skip hoist with greater said motor decreasing below a prede efficiency than in past, for weights termined during dynamic braking. various loads carried by si will 6. In a motor-control system, combi not change motor. The skip nation with a main motor having an arma will not vary greatly from a prede ture and a field-magnet winding, 0 termined consistent with safety, until for controlling current ow and through means track limit switches and automatic said armature, means for effecting elec brakes (not operate to stop skip. trical braking said motor, an auxiliary While I have shown my invention in a motor, a differential gear having end preferred form it is apparent that modifica members re, respectively, rotated by tions may be made in apparatus tem said main and said auxiliary motor, and loyed and arrangements circuits without means controlled by said differential gear eparting from spirit re. I desire, for varying voltage across said field refore, to be limited only by scope magnet winding upon said appended claims. motor changin more than a predetermined I claim as my invention: during electrical braking. 1. In a motor-control system, combina 7. In a motor-control system, combi tion with a motor and means for normally nation with a main motor having an arma controlling said motor, and ture and field-magnet winding, and a re means for effecting electrical braking sistor, a contactor for connecting said re 9 said motor, automatic means for restoring sistor in parallel relation to armature

5 O ,87 said motor, a controller for operating said contactor, a field resistor in series relation an automatic device controlled by with said field-magnet winding, a contactor said motor for operating said mo for shunting said field resistor, an auxiliary tor at substantially constant during motor, a differential gear having end electrical braking. - members re, respectively, rotated by 11. The combination with a motor sub said main motor and said auxiliary motor, jected to variable loads and means for ef and means controlled by said differential fecting dynamie braking said motor, 8 shunting gear for contactor. controlling operation said an automatic device for increasing 8. The combination with a motor, and a predetermined said motor upon said during dynamic falling below brak means comprising a controller having a plu ing, said means reducing said and rality controlling positions for normally said 2E.; motor upon said becoming greater C motor, o than a predetermined.. automatic means adapted to partially com 12. The combination with a motor subject pensate for an excessive variation in to variable loads, said motor having a field said motor upon said controller being magnet winding, means for varying 4 actuated to an inoperative position. excitation said winding during dynamic 9. The combination with a motor subject braking, and an automatic device compris to variable loads, and a controller having an ing, a member controlled by f position and an operative position, said motor for operating said means to raise an automatic device for maintaining or lower said motor upon said 0 stant said for motor a at a substantially con motor varying its below or above a period time after said predetermined ing. during dynamic brak controller has been actuated to its f po sition, regardless variation in weight, testimony where, I have hereunto said loads.. subscribed ber 19. my name this 22nd day Octo- to 10. variable The combination loads during with electrical a motor braking, subject HENRY D. JAMES.

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