USRE16658E - thurston - Google Patents

Description

- une 14,y 1927.

E; B. THIJRsToN CONTROL wUsGHANIs/ia @riginal Filed Nov. 12, 1921 z-sne'etg-snee- 1- Junef14,19v. Re. 16,658

E. 4la. T HURsToN i CONTRQL MECHANISM' Original FiIedINov. 12.111921 2 Sheetsf-Sheaet,2

' 25 y y Y Y In elevator shaft- 1 areA landings 2 forele- Reissued June' 14, 192.7..

UNITED *STATES PATENT OFFICE.

-Eizns'r B. frmmsrroN, OF TOLEDO, OHIO, AssrGNo'n To THE HAUGHTON ELEVATOR & .MACHINE orroLEDd OHIO, CORPORATION oF OHIO.

CONTROL MnoHANIsM.

A Original No. 1,585,518, dated Kay 18, 1926, Serial No. 514,584,.1'e'd November 12, 1921. Application for Y reissueled March 3, ,1927.l Serial No. 172,525. i

Th-is invention relates to the control of I electrically operated equipment.

'This' .invent-ion* has utility' when incorporated as 'an elevator' controller equipped with an alternating electric currentv drive,'hav 'ing advantages. for smoothness ofv operation at lhigh speeds,"especia1ly in ranges above ft. per minute, and' even-uptoelevator speed 1naxima,.the connections 'operablqto e'ect gradual.A and quick pick-up on high "speed with quick but gradual stopping obtained by having the control 'connections' through the low speed. "gReferring to the drawingsf' fFig.' 1 is Aa wiring diagram of an embodiv ment of thejinvention in a two-phase four- I wire alternating electric currentinstallation .Vfor elevator servlce;`

Fig. 2is an across-tlie-line analysis of the 'ihstalla-tion diagram of Fig. 1, the reference characters in parentheses indicate the Opera- 4torfor thegswitch adjacent which saidreference character is placed; and

Fig; 3. ,sho.ws motor operation curves hereunder. 'i

vator car 3 in its travel vas actuated from -hoist line 4'. This'hoist line` 4 extends from the'car upwardabout 'drum 5, and thence about idler 6 to counterweight. 7.

'Considering the wiring lay-out, power Y supply lines 8,; 9, completen phase, while lines 10, 11, are the power-supplyglines completing the otheror second phaseofthe two-phase four-wire alternating current supply. z The various .safety-devices and their interconnection with the controller are herein shown as in the vphase supplied by the lines 'The power supply line 9. has branch line 12` .extending to emergency switch 13. 0n the car.3,'loca`ted within reach of theopcrator ofthe car, and normally closed. VFrom this emergency switchv 13. on the car 3, extends line 14'to :switch 1.5, vclosed .when thecar carried doors are closed and open when such doors are open, say" at a landing. ',From

. this door interlock switch 15 line 16 extends ,17, opened by speed governor 18 line 19 from the car3 when the .At-revel ofthe car 3 exceedsthe speed or travel to switch f rate for which 'the governor is setfThe' ,door

`interlockswitch 15 is shown ,openedV by car Ydoor 20. v 7

The speed' controlled switch 17 has line- 22 therefrom -to upper v'overtravel switchv 23,

normally closed, and'thence byline 24 tol lower overtravel switch 25, 'also normally closed. From this .switch 25,'li'ne 26 extendsV through landing door interlock switches` 27,'

open if any landing door`28 be not'closed;-

thence by line '29, resistanceBO, through slow speed main switch coil 31 kof slow speed main s witch 32.l Leading Ifrom this coil 31 vis line 33 to interlock 34 at main high'speed switch 35.- lith this' switch 35.11ot thrown,

at up direction switch 41. Thesev inter-locks 37, 40, are open .until the controller has op- 'l erated to determine the direction the elevator car 13 -is to travel. This` means the slow speed In'ain switch 32 has one side of the line tothe coil 31 open until the directionfor car travel has" been determined.A

Furthermore, due to the interlock 34, even though the direction" switch selected 4he thrown for' energizingthe coilv 31, such coil is deenergized when the main high jspeed' The slow speed main' switch has been, described as connected into' the control system herein disclosed between the power sup-'- plyand interlocks On the 'direction switches 38, 41.

operationA 'as a` directionv switch isthrown. To effect this Sequence of control, the line.

The coil for releasing the motorV vshaft is also' connectedv by interlocksggtor- 2 9. has branch 42 to interlock 43 at the down direction switch 38, 'and said interlock` is open as this direction switch-38 is open.

-Linel44 from the line 42 extendsl to interlock 45 'at the up. direction switch 41.' This ipter- 'lock 45 is alsoopen when the up direction switch 41 is Open. .When the up 'direction switch 41isV closed, the interlock 45 connects the line 44, through this interlockl with line'46 'extending back to the side of the VVico interlock 43 awayfroin 'the line 42 thereto.

Accordingly, with either direction switchl 38 or 41 closed, an interlock connectslto line 47 'and thence to coil switch 49.'

From this brake switch coil 48, line ex-I' tends to central terminal 51 engaged by con- 48 'at brake releasing .Y

tact 52 of controller 53 in the car 3. For updirection travel of the. car 3, the controller has its upper end rocked to the left, shifting the Contact 52 first to connect the terminal 5l with terminal 54 of line 55 to upcurrent supply .from the lines 8', 9', but' such' circuit is open, due to the interlocks at the direction switches being both open.

Shifting of the controller 53 to have its contact 52 engage terminal 61 permits flow of the first energizing circuit from the supply line 8 by'way of line 62 to energize coil 63 at the up direction switch 41. The other side of the coil 63 is connected by line 64 and the line 42, to the line 29, in communication with the supply line 9. The controller contact 52 is connectable for communicati-on with the supply line 9. v

This energizing of the 11p-direction switch coil 63, ell'ects throwing of this switch 41, so

positioning the interlock 45 that the lines `Vator car travel in up direction.

44, 46, 47, energize the coil 48 to throw the brake releasing switch' 49. Branch line 65 from the power supply line 8 extends to this switch 49, and as this switch is cl-osed is connected to line' 66 to brake coijl 67, thence by line 68 completing'circuit to the supply line 9. Simultaneously branch line 69fro1n the'supply line 11,extending to the switch 49 is connected to line 79 to brakecoil 71, having lline 72`thcrefro1n tothe power supply line 10. The switch 49 has thus served to energize both coils 67, 71, of the brake for operating brake shoes 73 against the holding action of spring 74, to release brake drum 75 on shaft 76 so that motor 77 may be operated to drive the drum 5 for el'i'ecting ele- As this rip-direction switch 41 vis thrown to closed position, the interlock 40, has connection with the line 62, by way of the lines 39,` 36, the interlock 34 -at the main high speed switch 35 and thence by the line 33 to energize the coil 31 at the switch 32.v This slow speed main switch coil is energized inasmuch as the line 33 is thus connected to the supply line 9, while the line 62 is connected to the supply line 8.

The control of the power lines as brought about by closing the switch 41 for up-direction travel, may now be considered. The power supply line 9 hasbranch 79 to the down direction switch 38, and line 8O therefrom to the up-directiom switch'41. This vspeed winding 84 for the motor 77.

line 8O is c-onnected by the closing of this switch 41 t the main slow speed switch 32, by line 81. The power supply line 8 has branch 82 to the up-directionswitch 41, connected by the closing of this switch 41, toline 83 extending to low speed winding 84 and -to high speed winding 85 for the nio-1 tor 77.

The power supply lines as controlled by the main slow speed switch 32 connect the resistance for slow speed starting of the motor 77. The power supply line 10 has branch 86 to this switch 32, while the other side of this phase has connection from the power supply line 11 by way of line 87 directly to the windings 84, 85, at the motor 77. As this main slow speed switch v32is closed, it connects the line 81 by line 88 through rsistances 89, 90, and line 91 to the slow speed winding 84 for completingihe phase therewith as to the line 83. The closing of this slow speed switch 32, connects the line 86 to line 92 through resist-ances 93, 94, and by wayot line 95 to complete the second phase with the line 87 at the sltw T 1e motor 77 is accordingly fully connected up for startingl and its shaft 76 is released to permit such starting for moving the car 3 upward.

The acceleration oi. the slow speed operal tion of the motor 77 is brought about automatically after the main slow speed switch `32 is closed. From the line 69 at the brake releasing switch 49 extends line 96 to coil 97 at slow speed accelerating switch 98, and4 from thence by way of line 99 t-o the line' 92 at the switch 32. The slow speed accelerating switch 98 is accordingly thrown immediately the switch 32 is thrown. The throwing of this switch 98 cuts out 'resistor coml prising resista'nces 89, 93, as the motor 77 is getting under way for more rapid building' up of the starting of this motor 77 However,the resistor comprising resistan'ces 90, 94. is left in as-current modifying means.

The starting of the motor v77, as herein described has been by step by step shitting` of the controller 53. In practice, more' especially in passenger elevator 'service, 'vthe shifting of the controller 53 is so rapid that actually there is not slojv speed winding operation for starting the motor 77, but the vstarting is on high speed with the automatic acceleration therefor. Accordingly the shifting of the controller 53 to 'have its contact 52 engage terminal 10() brings about control connections as usual `for quick acceleration in starting the car 3.

The high speed point or terminal 100 at the controller is connected by line 101 past normally closed upper" limit switch '56, thence by way of line 102 to the interlock 34 at the main high speed switch 35. As this interlock 34 is open to the line 102 until this tion as yet in 'this line. -The-line 102, has

branch 103 to interlock 104 connected in the torque motor automatic high speed acceleration control. As the torque motor is not` started, this interlock 104 is closed and there is permitted Current iiow to the line 103. by way of lineV 105 extending to line 7106 on `the saine side of open interlock 34 as the lin'cs 102,' 103. rFhis line 105 has branch line 106 to main high speed switch coil 107, at thc' switch 35, with line 108 therefrom 'to the lines 42, 29. f

The completion-of the circuit through the coil'107, in`throwing the main -high speed switch 35, operates the interlock 34 for` deenergiziiig'thefniain slow speed switch coil .231, insuring that suchswitch 32 is open.

This shifting ofthe interlock 34, shorts the energizing circuit for the coil- 107, from the line 102 to the line 106, thereby making the continued holding of this switch closed independent of any position the interlock 104 may now assume. This interlock 104 at the acceleration mechanism for the high lspeed motor connections, insures thatsuch acceleration devices rre in the starting position before the high speed. main switch 35 is thrown to closed position.

' The closing of this main high speed switchl 35 controls power supply currcntby way of lines 109, 110,ijespectiv'ely, from the lines 86, 81, on the supply side of the switch 32. `The line109 is connected by closing the switch 35 -with line 111 through'resistor comprising resistances 112, .113, 114, and line 115 to' complete a phasewith the-line 87 at the high 118,119, and line 120 to coinpletethesec- `speedwinding .for the motor 77. Simultane'ously, the line 1104is connected through line 116, resistor comprising resistances 117,

ond phase of rent for the motor 77 with the line S3. v

From the line 1,11 is branch 121 extendthe two-phase energizing curing to l'windings 122 of torque motor 123,

completingthe rst phaseforv, this motor by Way of line 124 as a branch o the line 11. The line 116 has a branch125 to the second winding of the windings 122 for the torque motor 123. The phase of this second winding is 'completed by line 126 as a branch'of the 1ine 83. It will thus be seen that imme- 'tating inagneticffi'eld type of electromagnet- -diately the main higlifspeed switch` 35 is closed, energizing current is vs upplied for starting the torque motor 123.

This torque motor 123 is operable` as a. ro-

with travel limited to slightly less than 360". The driven'structure is so designed that the sequence of operations may occur portan'ce, 65

regardless of the direction of the'shifting of thisinotor 1.23. This is a factorof imor when the controller 53 is shifted to have high speed winding 85 of the its Contact 52 engage the terminals 127, 128, 129, corresponding for down .i

direction driving of the elevator car 3, with the up direction driving control tery inals 54, 61, 100, respectively, there is reve sal or' phase relations in the energizing of c-oil 130l at the down direction switch38.

IAccordingly, regardless of the direction of operation, the torque motor 123 rotates shaft131, and through speed reduction gearing 132gives shaft 133 'carrying disk 134 with lug 135, a travel ot slightly less than 180D as determined by stop 136. ,A lag or controllable time interval- `for this operation Aot the rotary electromagnet-or torque motorI 123 is brought about by connection 137.l from the disk 13,4. This Aflexible'connection 137l .extends to weighted piston 138 as a recover travel centering or idle positioning finding device for the shaft 133. This vpiston 138 is guided in its'travel by cylinder 139 hav'- .ing "leakage control adjustable valve 140,

varying the retarding action in this dashpot assembly.

As the shaft 133 starts t-o operate, cam 141 throws switch 142, not only opening the invterlock Y104, but by branch linesl43, 144, r'espectively from the lines 111, and 116, con;

nects by lines 145, 146, to cut out'resistances I 112, 117. In the starting of the'inotor 77,

there is thus 'a-n'autoinatic cutting out-of acceleration resistance for aiding in rapidv pick-up of the motor 77 in coming'u-p --to speed.

,c ai'n 147 closes `switch 148, eiective through lines 149, 150, tocut out high speed acceleration resist-ances 113, '118.' Thereateryjithe` 'continued rotation of this shaft 133," throws Further rotation of/the shait 133, through ycam 151, closes switch 152,'and through lines.

153, 154, cuts outthe last resistanc'es 114,

119, of the high speed accelerationfor themotor 77.

Assuming the motor 77 has a normal speed for operation of 900 R. P. M.,the automatic feature herein for adequately handling the stopping of the equipment smoothly, may be thrown in say at200 R. M. The motor. 77 as described, while two-speed 'in its windings and control connections, may be started directly on high speed, even at all times, should such be desired. The slow speed Worked vout, in the automatic control con-l nections herein, has peculiar advantages in slowing down and stopping.

By throwing the controller 53 from the "vposition with the contact 52 engaging the terminal 100, back so that the contact 52 is clear of the terminal-100, but still engages the terminals 61, 54, whilethe motor 77 is-still ,running above 200K. P. M., there may occur..

lijn.

an automatic brakingor slowing down of the motor 77 independently of any release of the brake vshoes 7 3 for gripping the' drum 75. As this is a speed control feature, a governor is connected up for Someof this control opersupplied for such reverse direction of travel,

Ill

thereby avoiding excessive current consumption at the motor. This braking occurs by 'throwing the electric currentinto the slow speed windings 84, with the acceleration re' sistances 89, 93, out, but the permanent re-` sistaiices or motor slowing down current modifying means 90, 94, in. The speed of the motor 7 7 being above that for which the slow speed motor is designed, said latter speed say being 150 R. P. M., the electric current throughthe windings 84 brings about a most effective retarding generator action, electrically loading the equipment 'or slowing down. rllhe operation is an over speed propulsion of the motorbeyond the synchronous speed of the windings 84. In order that `such may not be tooabrupt at the outset and may build up a little as a cushioning eitectthe resistances 90, 94, as permanently in serieswith the windings 84, may be pro# portioned vto the mass and speed of the moving parts. This isa factor permitting accurate adaptation of alternating current electric motors of a commercial design' to a wide range of installations. Y

lVith the controller 53 oli the high speed terminal 100, the main high speed switch opens, and the interlock 34 falls to have the main slow speed switch 32 closed. torque motor 123 is dre-energized, and Vthe weight 138 resets the shaft 133, opening the switches 142, 148, 152, and closing the interlock 104. As the controller `53 has its contact 52 onlyoi' the terminal 100, but still engages the terminal 61, the brake coils 67, 71, are ystill energized, and the beyond synchronous speed braking action of the windings 84 is thus far doing all the work of slowing down.

Should the controller loe shifted back away from-the terminal 61, and off the terminal 54, the brake coils 67,71, 'are de-energized,

and the brakeswitch 49 is opened. The n ter-lock holds the up direction 'switch 41 in as long as the switch 156 is closed. If this shifting of the controller 53 occurs beforef the motor 77is down to a speed of say 200 R. P. M., the coils 31 alnd 63 are not deenergized. The circuit from the line 9 through the safety devices, including the emergency switch, car door switch, car travel governor,- switch, upper Vand lower-overtravel hatch- The ' may while from the line 29 to the line 42there is connection of they coil 63 by way of the lines .62, 78, the interlock 40, and the lines 39, 36,

to switch 156` held closed by governor 157 on` the shaft 76, as long as such shaft is rotating at a 'speed above that selected for the throwing out of this switch 156, and herein .taken as an example as 200 R. P. M. From this switch 156, as in an auxiliary control means having a speed responsible device actuator therefor, extends line 158 past nor--4 mally closed down limit'switch 159, thence by line 160 past normally closed upper limit switch 56, by line 161 to the line 58, connecting through the overtravel switches with the 4line 60 t0 the line 8.

There is accordingly a -liolding of the switch 32 in closed position'at all times when the controller 53 is shifted toward or past elevator car stopping position otl' the high speed terminal, so long as the motor shaft 7 (Slis rotating in excess of the 200 R. .P. M. for which the speed responsiveswitch'156 is set to open. So, vwhether or not the controller 53 be only7 just oft' the high speed terminal, or back to neutral central position, the above synchronous speed braking of the shaft 76 by the slow speed windings 84 automatically occurs, with the permanent resistanees 90, 94, in. .The switch -156 is accordingly operable independently of the con-l troller 53. The action of this switclr 156 is such that at all slowing down or stopping operations, the higher travel speeds are retarded. Inasniucli as the holding action ot `brake sliocs is inversely proportional to the operation isk above `the synchronous speedV thereof, or instead of being exclusive, for the more rapid, -but still smooth stopping, there be supplementing of such electrical braking by mechanical braking action ofthe shoes 73`upon the drum 75 as forced by the spring 74. As the speed of the shaft 76 falls below 200 R. P. M., the switch 156 opens, and the coil 31 is de-eneigi'zed, opening the switch 32, thereby cutting out the windings 84. The'inalrslowing up of the motor 77 is ac n cordingly handled solely by the brake spring 7 4. lVliile'the motor 77 is operating in the iis iange of the higher synchronous speed of y the windings 85, but with such windings cut out,due to the controller position, or the operation of some stopping device, the action of the switch 156 in holding the windings 84 in for generator braking action, builds up such braking action as the motor 77 slows f down due to tliepermanent resistances 90, 94.

For illustrative purposes', reference may be had to Fig. 3 having speed ordinates and torque-distance aloscissae. Curve. 163 indicates the torque-speed, curve of the motor 77 13 'connected up for slow speed starting with line voltage on the windings84and no resis- .tance 1n series, lthat 1s, without permanent ' resistanoes 90, 94. v 'Clurve 164 is' the torquespeed characteristic of such slow speed motor I operating as a generator or acting as a brake from thehigh-speed operation of the motor."

V'Ad-own to the slow speed` operation. The' bow in this curve away from theordina'te indi- .cates that' there is abuilding up or increase in this braking action as the 'speed decreases f from, the speed maximum,` and such bow, .introduces a vcushioning in this braking action for stopping'f-the elevator. With the introduction of, the resistances 90, 94, in series with the slow speed windings 84 of the motor 77, the harshness ofthe curve 164 isi I trolled by the governor v157 as lonfr further modified to approximate' curve 165.

' Accordingly these resistancestend to lessen the torque. These-resistances. 90, 94, are v held intogether with the windings 84 bythe out the highspeed motor windings 85 by moving off the terminals 100 or 129, that is,j back to the terminal 61 or tol the terminal 128, the brake coils 67, 71, remain energized y and the Vslow speed motor with its windings I 84 in 'series with the permanent resistances 90, 94, acts alone in braking as shown by' speed-distance curve 166. The further shifting of the controller 53 tot theo-if position, es thejautomatic switch 156 .is opened, the' brake spring 4 take. hold in completlng the stopping of the elevator as shown by curve 167 llhen the controller 53 is shifted to the' Y full off position from full on position, there is not only the generator braking action of the slow speed motor windings'84 as modified by the resista'ices 90, 94, but such is supplemented by the brake spring-74, and there is automatically effected a smooth, but even more rapid emergency braking or slowing down of the elevator car 3 as shown by curve 168,.due to the simultaneous braking effect of ther"electromagnetic brake and the generator action of the motor. The word supev plement-ing asused in some of the' claims is intended to define this simultaneous action of the two braking mediums. f

With the holding 'action of he brake shoes by friction inversely proportional to the fspeed, the more arduous and wear promoting range is taken by the dynamic braking of the slow -speed motor. The harshness 'of the braking action of no resistance in the slow speed windings is'modied by the resistances 90, 94',` which, in practice, are proportioned to the kinetic energy of the traveling mass,

-in'o'rder that. taking hold for stopping may not mean a jerk. The slow speed motor design to increase the generator-load as the shaft'f vslows down from the high speed, is shownby thecurve 165 archingaway from vertical speed ordinate 169 as the curve shows speed'drop toward abscissa 170. This is an additional factor in according maximum slowing up 'acton'with a cushioning at the initial taking hold-upon 'the cuttin ofthe high speed motor. Taking the holding action of the brake by the'spring 74. as one at the full speed ofthe motor 77 o f 900 R.- P. `M.,` `vthen upon the cutting out of the switch 156 when the'V motor 77 is down-to -v 200'R. P. M., the work givenv such brake would be as eighty-one into four, ir slightly over onetwentieththe iWork required of the brake at the full speedof the motor.

less wear and` tear .in an installation of su- 'periorsmoothnessfof control. Y l y -The generator hr king'by the slow speed" vmotor'windings 84 is in 'the region above the synchronous' speed for such motor, and the final slowing up of the' last 'stagesof stopping is handled solely by thebrake spring 74. The brake spring 74 'may work inconjunction with the. slow speed motor windings 84 and the rsistances. 90, 94, atl the higher speeds, or,l as'heldout by the concontrol switch 156 has act.` .FI't is tobe noted etorqie'mot-or for the acceleration 'switche`s' ismconnected to the powermotorlfor the elevator andthe ener-V L gizing current" for `the :torque motor -is through lines at all times, directly connected out- In Y .brake design, this means great economy .with A troller 53,'not come inuntil theautomaticl acted, or about to'4 with windings o the power motorv independently of main line or directionV switches there-l between.v -This connection of this rotating field magnet lor torque motor is directly con'- nected tothe winding fof .theymotor even though vthere may be resistance between the line current supply. and the windings of the power motor .with ,therOnnections to the `torque motor as more remotefrom the. power motorw'thansaid resistance. Therefore it follows, operationof thisftorquemotor doesl not depend upon the operation-of any switchV llO between the power motor' and torque motor.

The torque motor, as herein shown, is inoperativefwhen supplied with a. single phase, andrtherefore gives a protection against the failure of a switch' Contact inthat` it does not short circuit the resistance'in such a 'failure-,and thus does notallow thepower motor winding to be directly across the line on a single phase without resistance. It will be understood` that the resistors 89, 90, 93

and 94 operate as deceleratingl as well as.

accelerating resistors, and that whereverthe term accelerating resistor or accelerating resistance is.- used in the claims' the term is intended to cover bothaccelerating and decelerating resistors. f

Theiinvent-ion disclosed herein, in so far as there may be disclosure of common subject-matter v.with my copending applications for United StatesLetters Patent, .as de` veloping into Patents 1,529,67 5 of March 17,

, thereof,

1925, and' 1,57 3,207 of February 16, 1926, each filed August 23, 1919, is a continuation motor 'when said controlleris' shifted from' motor actuating to motor stopping position. 2. An elevator, a two speed alternating electricfcurrentactuator including a'- motor for operating'the elevator, said motor having a low speed primary winding, a power supplyfor the motor, a permanent resistorconnected at all times and only with thelow speed primaryA winding for the motor, a controller for the motor, and means comprising a speed responsive switch and connections thereto from the `power supply bypassing the controller for maintaining the low speed winding connected to the power supply when said switch isi-closed 'and the controller 'moved from such direction of motor'running control.

3. An elevator, a two speed alternating1 electric current motor for operating theelevator, said motor having a low lspeed primary winding, a power supply for the motor, a permanent resistor connected at all times and only withthe low speed primary winding, a starting resistor forithe low speed primary winding, a controller/for the motor, and means comprising a centrifugal speeddevice connected to vbe driven with said elevator by said motor, a'switch operableby said device, and connections thereto from the power supply'bypassing the controller for maintaining the low speed winding connected to the power supply when said switch is closed and the controller -moved 'from such direction of motor running. control, said means, with the controller in oposition and the powersupply connected to said low speedV winding, being operable to cut oit said power supply'from the low speed prilmary winding and the permanent resistor before the motor stops.

4. An elevator, a motor therefor, two speed windings for the motor, an alternating electric current power supply for the motor,

an electromagnetically released brake for the elevator, a controller for controlling the. connection oit' the supply to the brake and motor, and means for supplementing the ret'arding action of the brake comprising a speed responsive switch and connections .thereto from the power supply bypassing` the controller for maintaining said current supply to thev lesser speed winding when said switch is closed and the controller moved from such direction of motor running control. y

5. Actuat-ing means for an elevator comprising an alternating electric current power supply, an electric `motor provided with windings for oney synchronous speed and windings for a less synchronous speed, a resistor connected at all times and only with said less synchronous speed winding, an accelerating resistor for said less synchronous speed winding, and means for maintaining said current supply to said less synchronous v speed. winding and first resistor above syn- Vof said less synchronous chronous speed speed winding. r

6.11 motor, an alternating electric powerl supply therefonphigh and lowfsynchronous' speed windings for the motor, a permanent resistor connected at all times and only with said-low lsynchronous speed winding, an accelerating -resistor for said low synchonous speed winding, control means for the motor operable for disconnecting the supplyof curp rent to the motor prior to stopping, auxiliary control means for connecting said low synchronous speed winding for generator action of the motor in stopping, cutting out said accelerating resistor and maintaining said supply to said low synchronous speed winding and permanent resistor, and a brake for completing the Vstopping of themotor.

7. An alternating current motor having a power winding, a shaft for the motor, a brake for theshaft, means normally setting the brake, an alternating electric current power supply for the motor, and means for establishing dynamic braking connections between said motor and supply comprising current modifying means for the motor thereby supplementing the brake for-stopping the'motor.

8.,In a motor control system, a motor, a high speed winding for the motor, a second speed winding for the motor, an acceler- .ating resistor for the high speed winding,

los

resistorfor thesecond speed winding, a

starting-resistor for the high speed winding,

.high and second speed switches -for the motor, a controller shiftable from an off v. position to control the switches,'andarotat tween sai tionsv for generator action in retarding the nected at alltimes and only 'said low 20 c.

lng field magnet connected onthe' same side of said highV speed switch as said motorfor resistor.

- 10. An elevator, a' two speed alternating electric current actuator therefork including a controlling' the cutting out-of. said high speed 'motor having'a low speed ,primary windmg,

a power supply for the motor, and means for establish'in dynamic braking connections b epermanent current` fiow mod1fying means consisting of relatively fixed .elem'entsconspeed primary winding.

11'. A motor having firSt second-main motor and supply comprising.

position in suchI direction for cutting out the ow-speed 'connection and resistance as the motor" slows downfrom high speed operation."

14. An alternating current electric motor, and control means for the stopping thereof lembodying an electromagnetic brake, permanent resistance andfadditional resistance insertable with the motor for thereby lessening the torque of the motor, a controller for the motor, and a speed device for holding the motor and permanentresistance connected duringretarding operation of the motor for .a decrease ofV the motor operative rate to a determined s eed,'said controller Vbeing also operable for li ation of said brake. v Y l5. An alternatino 'current electric motor, and control means tional resistance insertable with the" motor switches, 'direction switches, a controllerfor vthereby-lessening torque of the'motor, a

shiftable from an o .position tocontrol a ance from the second main switch, a speed controlled switch effective the controller is shift-ed from the o'rixposition lfor the second vswit'ch for establishing connecf motor, a rotating. magnetic field magnet for l controlling thcutting ont o' the starting resistance, rotating-magnetic' field magnet Lil yswitch means permitting/controller direct control of the second main switch, and switch means at the second main switch bypassing the magnet switch means as the second main switch isV operated,'sai d second. main switch means coacting to ont ont the first main..

switch.

l ances for both 'speeds 'of the motor, a per' -manent resistance for the low speed motor permanent .resistanceffor said low speed 12. A two speed motor, accelerating resist'- operation, a rotating magnetic field magnet for cutting ont theV high speed resistance, and

a controller for the speeds of the motor shiftablevfrom high speed position for geni l erator operation-ofthe low speed motor as modified by said permanent resistance `in retarding the motor.V

13. A motor having a low speed connection, a lfirst main switch therefor, accelerating resistance therefor, a low speed 'acceleration switchcontrolled for being -thrown in automatically after the firstmain switch, a

-for the motor' speeds, and a switch effective with the controller thrown` back from on controller for themotor, and a speed deviceA operative rate to adetermined speed.

"16,'Ina control system?, a motor, a line switch for the motor, polyphase power sup- Iplyli'nes, for the motor, a controller'shiftab efrom an 0H' position to 'control the switch, la primary winding for themotor connected to the'switch, a motor start-ing resistor, and a rotating magnetic fieldmagnet having `poly/phase connection to said lsupply. lines and on the same side of said switch .as

I for the stopping thereof embodying permanent resistance -and addi-4 tion ofthe motor for adccrease of the motor ringing about retarding oper- Asaidrmotor for controlling the cutting out of said resistor.

17 i In `a control system, a motor, `high and second speedswitches for the motor,'a controller'shiftable from an oii' position to control the switches, a. second speed primary.

winding for the motor connected to the` second speed switch, a motor starting resistor.

between the motor and the high speed switch, a highspeed winding for the motor, a power supply for .the motor, a rotating magnetic field magnet connected on the same side of said switches as said motor for controlling the cutting outof saidresistor, and means comprising a speed responsive switch and connections thereto from the power supply bypassing the controller for maintaining said power lsupply to said second speed primary winding'above 'a predetermined speed of said motor when said switch is closed and the controller moved from such direction of motor running control.

.18. An alternating'current electric motor having high speed windings and low speed primarywindings, and a permanent resistor having high -speed connections and low speed connections, and a resistor perma- `nently connected in the low speed connection powerv supply circuit.

` 20. In an elevator, a'multi-sp'eed alternating electric current actuator therefor including a motor having a power circuit,'a power supply for the motor, means forestablishing'. dynamic braking yconnections between said'v motor and supply, and current flow modifying means consisting of relatively fixed elements connected in the power supply circuit during 4said .dynamic Abraking action.

21. In a multi-speed motor, a permanent.

resistor in the power Supply-circuit for one ofthe lower speeds, and a controller for the speeds of the motor which `whenshifted t 'o said lower speed' from a higher speed position results in 'generator action of the motor,`

said action being modiied by said permanent resistor. 1

22. In an alternating current multi-speed motor, a current flow modifying means hav- -ing permanent constants and so located in the primary circuit as to at all times affect the generator action of the motor in slowing down. y

23. An alternating current electric motor having highspeed winding connections andi.

low speed windingconnections and ermanent and accelerating resistors locate in the.

shifted from high speed to low'speed posi-.

' tion results in generator action of the motor,

said action being modified by said permaentresistor; -26. A motor having a low speed connection, a. first main switch therefor, an accelerating resistor therefor, a low speed accelera.- tion switch controlled for being thrown in automatically after said first main switch, a permanent resistor vfor said iow` speed motor connection, said motoi also having a high speed connection, a second fmain switch therefor', an accelerating resistor for the high speed motor connection, acontroller :For the motor speeds, and a switch effectiveA for cutting out the low speed connection and accelerating resistor as the motor slows down from high .speed operation when the controller current supply is broken. Y

27. An alternating current electric motor,

an alternating current power supply therefor, means for slowing down the speed ofE the motor emb'odyin a permanent resistor in the motor circuit or lessening the torque ofthe motor, Aand* anA automatic device for holding the motor and resistor connected to the power supply during decrease'of the motor speed toa predetermined rat-e.

28. An elevator, a multi-speed Aalternating electric current actuator including a motor for operating-the elevator, said motor having low speed connections, a power supply for thel motor, a permanent resistor connected'atall times with one of the low speed connections for the motor, a controller for. the motor, and means comprising a speed responsive switch and connections thereto from Athe power supply bypassing the controller for maintaining said low speed connection to the power supply when said switch is closedand the controllencurrent supply broken. i

29. An elevator, a two speed alternating electric current motor for'operating the ele` vator, said motor having a iow speed primary winding, a power supply for the mo- Ytor, a permanent resistor connected at. all

timeswth the low speed primary winding, a' controller for lthe motor', a governor, a

switch operated by said governor, and connections to said switch from the power supply bypassing thev controller for maintain-` ing the low speed winding-connected to the power supply when said switch is closed and the controll current supply broken, said vgovernor, with the controller in off position and the power supply connected to said low 'speed winding, being operable 'to .cut oit' said power supply from the low speed primary winding and the permanent resistor before the. motor stops.

30. The combination with an elevator,a -v` i multi-speed alternating current motor :for

operating thev elevator, a controller for the motor, a resistor for the motor, and means including a speed responsive switch for mamtamlng a short. circult around a portion only Vof saidpresistorabove a predetermined speed when said controller isv shifted from motor actuating to motor stopping position. 31. Actuatingi'means for an elevator comprising an alternating electric current .power j supply, an Velectric motor provided with windings :tor one synchronous speed and windings for a less 'iy'nchronous speed, a manually operated controller for the motor, a, resistor connected with one of said less vsynchronous 'speed windings, andmeans independent of salidmanually operated controller for maintaining said current supply to said less synchronous speed windings and to said'resistor when the motor is runningv at a predetermined speed above the synchronous speed of said less synchronous. speed windings.

32. motor, an alternating electric power supply therefor, high and low speed wind- Y ings forthe motor, a permanent resistor connected with said low speed winding, an accelerating resstor for said low speed windc ing, control. means for the motor 'operable for disconnecting the supply'of current to the' motor prior tosto'pping, auxiliary control means for maintaining lsaid low speed winding connected yfor generator action of the motor in slowing down, and a brake forsaidmechancal' brake to be applied simultaneously with the dynamic brake without cutting off the power supply to the motor.

current electric mo- 34. In an alternatin i erefor, a mechanical tor. a power supply t ,brake therefor, and means including both manually operated and said winding is maintained.

automatic trollers 'for dynamic braking of-said motor and whereby the operator can at will cause said mechanical brake to be applied simultaneously with the dynamic brake without cutting off the power supply to the motor.

35. An alternating current electric motor, an alternating current power supply therefor, a mechanical brake therefor, a con-A troller for'the motor, and an automatic device for holding the motor connected to the power, supply and causing dynamic braking during decrease'of the motor speed tofa predetermined rate, said controller being operable for bringing .about simultane ous dynamic and mechanical braking action with the'motor lso connected.

electric motor having a. power winding, an electromagnetic brake for the motor, Ya current power supply for the motor and brake.

means for maintaining said Supply to saidA winding tojnsure dynamic brakingfi action during mtor deceleration while the' motor is rotatingabove a predetermined speed, and means for applying said- Velectromagnetic brake at will independent of the speed of the motor and while said power supply to '37. An elevator, a multi-speed alternating electric currentactuator therefor. an alternating electric current power supply for the actuator, a brake for the actuator, means for reducing the speed of the actuator without :setting the brake, and means for continuing the power supply to the actuator after 'setting the brake, thereby producing-r simultaneous braking action of said Atwo braking, vmeans.

-38 elevator, a motor therefor, two speed windings for the motor, an alternating electric currrent power supply for the momotor' .and whereby the operator` can at will cause tor, a brake for the elevator, a controller for controlling the connection of the supply to the brake and motor, and means for securing braking action by the motor in addition to .and simultaneously with the braking ac- ',tion of said brake, said means comprising a speed responsive switch and connections thereto from theV power supply for maintaining said current Supply tothe low speed `Winding when 'said switch is closed and the controller current supply broken.

39. An elevator, a reversible multi-speed alternating electric current actuator, an alternating current electric supply foi-the actuator, a brake for the actuator, means for 'reducing the speed of the actuator Without setting the brake, means for setting the brake independent of, the speed' of .the actuator and without cutting oif the power.

supply to the actuator, and means for establishing dynamic braking connections vbetween the actuator and power supply when the actuator is moving in either direction.

40. An elevator, 'a multi-speed alternating electric current actuator therefor, an 'altere nating electric current power supply for `the actuator, Va brake for the actuator, means for reducing the speed of the actuator without setting the brake, dynamic braking connections between the actuator and power supply comprising `current modifying means brake during dynamic braking action without cutting off the power supplyl to the actuator.

vfor the actuator, and means for setting the 41. An alternating current electric motor,

control means for stopping the motor embodying an electromagnetic brake, a permanent resistor in the motor ciicuit'vfor lessy ening the torque of the motor, a controller 36. An alternating current multi-speed Y for the motor, and a speed device for holding the motor and resistor connected to the power supply during retarding operation of Y the'motor for a decrease of the motor operative rate to a predetermined speed, said controller beingr alsovoperable for bringing about retarding operation o f said brake.A

42. An elevator, a' multi-speed reversible' alternating current motor therefor, an alternating current power supply for the motor, power connections for each speed, a controller operable to establish high speed running condition for the elevator, automatic4 means eiective to establish low speed connection for the motor and to maintain such connection with the controller shifted from high speed position tomotor reversal position, and connections from the controller for motor reversal which are rendered ineffective until said low speed connection is broken.,

43.'An elevator, a multi-speed reversible alternating current motor therefor, van alternating current electric power supply for the motor, power-connections. for each speed, a controllerfor the motor, a. magnetic brake connect-ion for the motor andv to maintain such connection when the controller is shiftedi from high speed position to motor reversal position, and connections (from the 'controller for motor reversal andl brake: re-

lease. -which are rendered ineffective until said low speed connection is broken.

44. An elevator, a reversible motor'therefor, high and low speed windings 'for the motor, an alternatingvcurrent power supply for the motor, high andlow speed 1switches for the respective windings, a controller operable to close-the high speed switch and establish high speedrunning condition for the elevator without'rst establishing low speed running condition, and means com.v prising a speed responsive'switch effect-ive ply to the `low speed Winding and to mailitain such connection with the controller shifted from said runningv establishing condit'ion to motor reversal position, there being connections from the controller for motor reversal rendered ineifectiveiintil said speed responsive switch is opened.

45. A reversible motor, alternating electric current power supply therefor, accelerating means fdr the motor, accelerating switches for said Vaccelerating means, vreversing switch means for the motor, a rotating magnetic field magnet directly connected to the motor circuits independently of said reversing switch means for operating said accelerating switches, means other than said magnet for operating the reversing `switch means, and a controller for operatingV vthe magnet in one direction for one direction of motor operation and in the opposite l direction for the other direction ofinotor operation. v i

46'. An alternating current. electric motor, low and highspeed windings for the motor, direction switches for the motor,l aecelerating means for one of said speed windings of the motor, acceleratingl switches for said accelerating means, a' rotating magnetic lield magnet directly connected to said, set of speed windings independently of said switch' means for operating said accelerating switches, means other than said magnet for operating the direction switches, and. a con-- troller for operating the magnet in one direction for one direction of motor operation and in the opposite direction yfor the other direction of motor ope-ration.

47. In amotor control'systeni, a motor, a

highi speed winding for the motor, a second to'piovide connection with said currentsupspeed winding for the niotor, an accelerating resistor for the high speed winding, an accelerating resistor for the second speed winding, high and second Speed switches for the motor, a controller for the switclics,and

a rotating field magnet connected on the' same sideof said high speed switch as said motor for controlling the cutting out of said high speed resistor.

48. A multi-speed motor, an accelerating resistor for the high speed circuit, a rotating magnetic field magnet for cutting out said resistor, and a permanent resistor so located as to modify the generator action of the motor iiijslowing down.

In testimony whereof, I havel hereunto signed my naine to this specification.

ERNEST B. TI-IURSTON

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