US1301088A

US1301088A - Motor-controller.

Info

Publication number: US1301088A
Application number: US175615A
Authority: US
Inventors: Thomas E Barnum
Original assignee: Cutler Hammer Manufacturing Co
Current assignee: Cutler Hammer Manufacturing Co
Priority date: 1915-01-12
Filing date: 1915-01-12
Publication date: 1919-04-22
Anticipated expiration: 1936-04-22

Description

T{EJBARNUM. 11101011601111101151 'AYPPLlcATloN 111120111111. 12. 1915. y I j l Patented Apr. 22,1919.4

2 SHEETS-s115511.

T. E.-B.ARNUM.

' MOTOR CONTROLLER. APBLICATION F1LED.JAN.12.19|5.

Patented Apr.` 22, 1919.

2 SHEETS-SHEET 2.

UNITED sTATEs PATENT oEEroE.

THOMAS E. BARNUM, F MILWAUKEE, WISCONSIN, ASSIGNOB T0 THE CUTLER-HAMMEB ',VMFG. CO., 0F MILWAUKEE, WISCONSIN, A CORPORATION OF WISCONSIN..

MOTOR-CONTROLLER.

Specification of Letters Patent. Y Patented Api'. 22, 1919.

Application med January 12, 1.915. Serial No. 1,758.

To all whom t may concern.'

Be it known that 1,. THOMAS E. BARNUM,

a citizen of the United States,residing atY This invention relates to controllers .forl

electric motors and more particularly to self starters therefor One object of the invention is to provide a self starter for elevator, printing press and other service where quick response of the starter is desired.

Other objects and advantages of the invention will hereinafter appear.

The 'accompanying drawings illustrate one embodiment of the invention which will now `be described.

In the drawings,

Figure 1 is a front troller;

Fig. 2 is an end elevation looking from the left hand side of Fig.` 1;l

Fig. 3 is a sectional view on line 3-3, Fig. 1 and Fig. 4 is a diagrammatic view of one circuit arrangement for the controller.

As illustrated in Figs. 1 to 3, the controller includes an electro-responsive main switch 1, a multi-switch accelerating device 2 tending to move to running position, a solenoid 3 forrestoring said accelerating device to starting position, anda mechanical latching device 4 (Fig. 2) for holding the accelerating device in starting position subject -to release by said main switch. Also, the controller includes interconnections between the two electro-responsive devices whereby the accelerating device is restored to starting position whenever the main switch is opened and whereby the main switch is insured against response except when the accelerating device is in starting position. It will thus be observed that the controller may be operated to start and accelerate the controlled moter immediately upon closure ofthe energizing circuit of the main switch and that the motor is insured due protection upon .closure of the4 main switch. Hence-the advantage of the controller in elevator and printing press service,

elevation of the con-- where quick starting is desired, will be read- 11y apparent.

l The I nain switch 1 as illustrated is of conventlonal form and briefly described inl cludes two contact arms 5 and 6 mounted upon but insulated from the armature 7 of an electromagnet 8 supported in a suitable frame 9- fixed to an insulating panel 10.- As illustrated in Fig. 3 the armature 7 is fulcrumed on a pin l1 and the arms 5 and 6 have pivoted contact members 12 coperating with 'fixed contacts 13 inclosed in suitable blowout devices 14. Also, referring to Fig. 1, the armature 7 has two downward extensions 15 carrying a cross-bar 16 coperating with two pairs of yielding contact fingers 17 and 18 mounted on the panel 10, the bar 16 bein suitably insulated from said armature. T e arrangement is such that when the main switch 1s in open position bar 16 bridges contact fingers 17 whereas when said switch closes, bar 16 leaves fingers 17 and rbrid es fingers 18. The left hand extension 15 o the'armature also carries a pin .19to trip the latch ofthe accelerating device, as hereinafter set forth.

The accelerating device includes a plurality of contact fingers 20 of conventional form coperating with contacts 21 on the panel 10.` The several contact fingers are mounted upon a common rotatable shafty or bar 22 having end bearings 23 and 24 and each finger hasatrunnion bearing 25 on said shaft. Also, each contact finger has pro- ]ecting therethrough a pin 26 fixed at one end to a plate 27 on the panell() and carrying at its outer end a coil sprin 28 bearing against said finger to press t e same inywardly. The springs 28 thus tend to move the contact fingers vinto engagement with the contacts 421, thereby tending to move the device to running position, as above set forth. The shaft 22, on the other hand, has a series of .cams 29 (Fig. 3) which upon counter-clockwise rotation of said shaft progressively liftv the fingers out of engagement with the contacts 21 and upon clockwise -rotation restrain the Vcontact fingers for progressive en .gement with the contacts 21. Counter-c ockwise rotation' of the shaft 22 is effected by the solenoid 3 which is mounted in a frame 30 fixedto the panel and provided with a plunger 31 connectedv to the extremity of an arm 33 fixed to and prolecting outwardly from the shaft 22.

The clockwise rotation of the shaft is effected jointly by the tension of the springs 28 and a weight'34 on the arm 33 against the action of a dash-pot 35 mounted on the solenoid frame and connected to the extremity ofthe arm' 33 (Fig. 2'). Asfwill be understood, the dash-pot is provided to retard the movement of the acceleratin device for insuring gradual acceleration. lso, the accelerating device is provided with an adjustable stop to vary its limit of downtherein to receive the pin 39. As shown,-

the arm 33 and stop lever are in alignment whereby the accelerating device is permitted a maximum downward movement, whereas the downward movement ma be restricted by lowering the free end o the stopglever relative to the arm 33 and locking said lever and arm together in the desired relation according to the degree of restriction desired.

The latching means for the acceleratin device includes a pivoted hook 41 (Fig. 2

suspended from a suitable bracket 42 and biased by a spring 43 to engage a lug 44 on the arm 33 in starting position of the accelerating device. This provides for automatic latching of the accelerating device in starting position and release of the accelerating device is eiiected by the pin 19 on the main switch acting upon an extension 45 of the hook 41. As will be apparent from Fig. 2

the hook moves in a counter-clockwise direction to latch the accelerating device, whereas the pin 19 which moves outwardly upon closure of the main switch, acts upon the extension 45 to move thehook in a clockwise direction to release the accelerating device. Also, as will be apparent from Fig. 2, when the accelerating device is released the lug 44 engages the hook 41 to prevent return or counter-clockwise movement of said hook until return of theaccelerating device .to starting position, for a purpose hereinafter set forth. l

The aforesaid interconnections of the two electro-responsive devices are eiiected by the above-described contacts associated with the main switch and by two additionalsets of

contact ingers

46 and 47. The contacts 46 are of the same form as contacts 17 and 18 and are adapted to be bridged by a pin 48 (Fig. 1) carried by an extension 49 of the latching hook 44 (Fig. 2). The arrangement is such that fingers 46 are bridged by the pin 48 upon tripping of the latch and in consequence upon release of the accelerating device, whereas they are disengaged by said pm upon movement of the latching hook to latching position. As before stated, the hook 41 when tripped iS held against return or counter-clockwise movement until return of the accelerating device nto starting position andthe pin 48 is thereby held independently of the main switch, in brid ing engagementwith the contacts 46 pending full return of the accelerating device to starting position. The contact fingers 47 are similar to fingers 46 and are adapted'to be bridged by a pm 50 (Fig. 1) carried by a downwardly extending lug 51 on the arm 33 of the accelerating device (Fig. 2). The arrangement is such that in down position of said arm the pin 50 is disengaged from fingers 47 whereas upon upward movement of said arm said pin is moved to bridge said fingers.' As will be hereinafter more fully described the contacts 46-48 coperate with contacts 16-17 to energize solenoid 3 when main switch l is opened and the accelerating device is in running position. On the other hand, contacts 46-48 serve to interrupt the circuit of solenoid 3 upon return vof the accelerating device to starting position, while contacts 16-17 serve to interrupt the energizing circuit of solenoid 3 when the main switch closes. included in the energizing circuit of the main switch and open said circuit upon movement of the accelerating device from starting position thereby insuring against energization of the main switch except in starting position of the accelerating device, while contacts 16-18 complete a maintaining circuit for .the main switch after. response thereof. i y Referring now to Fig. 4 the controller is shown schematically and as governing an alternating current motor M. The main switch l controls the continuity of the primary cir-cuit of the motor while the accelerating device controls resistances R, R and R2 in the secondary circuit of the motor, said device serving to exclude said resistances in steps. For purposes of illustration the motor M has been shown as of a three-phase type, being supplied with current from lines 52-53 and 54 while the winding oftheI main switch and the solenoid 3 are connected across one phase of the supply circuit, the main switch being governed by a suitable control switch 55. With the devices positioned as illustrated the motor is disconnected from circuit and the windings of both the main switch and accelerating device denergized.

Assuming now that switch 55 be closed, circuit will be established fromv line 52 through switch 55, by conducting 56 through Contacts 47-50 are= contacts 47-50, by conductor 57 through the winding of main switch 1, by conductor 58 to line 53. This energizes main switch 1 causing the same to complete the primary circuitof the motor, which circuit is obvious and needs no description, and' also to trip the latch of the accelerating device. The accelerating devicethen operates to accelerate the motor by excluding the resistances R, R' and R2 'through circuit variations which are so obvious as to. require noV description. Main switch 1 upon closing also completes a maintaining circuit for itself extending from switch 55 by conductor, 59 through contacts v16-`-18, by conductor 60 to conductor 57., thereby paralleling the contacts 47-50 associated with the accelerating device.

Assume now that the motor has been started and fully accelerated and that itis desired to stop thesame. This is accomplished by opening switch 55 to denergize the main switch 1. The main switch thereupon opens completing the circuit of solenoid 3 from line 52 by conductor 61 through saidvsolenoid, by conductor 62 through contacts 46- 48, by conductor 63 through contacts 1'6-17,

by conductor 64 to line 53. 'Solenoidthere-V upon responds to restore the accelerating device to starting position and upon Vfull return movement of the accelerating device the latching device thereof sets and in so doin disengages contact 48 from contact 46. his denergizes Solenoid 3 leaving the accelerating device restrained solely by the mechanical latching means and subject to release for immediate operation upon reclosure of the main switch.

Should the main switch` open through failure of voltage the result would be the same as that described invthat the accelerating. device wouldbe restored to starting position upon restoration of voltage and the Y main switch would be insured against reclosing pending such-return movement of the accelerating device.

It will, of coui'se, be understood that thel invention may be embodied in other forms falling within the scopeY ofthe appended claims.

What I claiin as new and desire to secure by Letters Patent is:

1.In a motor controller, in combinationf tioned device to release `said accelerating Veo' device upon operation of said power controlling device, and means to directly control said power controlling device for starting Y .of the controlled motor.

2. In a motor controller, in combination,

'an electro-responsive power controlling device, an accelerating device biased to running position, a latching device for holding said accelerating device in starting position, means acting upon said latching device to release said accelerating device upon operation of said power controlling device and 'electro-responsive means for returning said accelerating device to starting position upon return of said power controlling device to establishment of power connections for the motor, electro-responsive means for restor` ing said accelerating device to starting position upon operation of said power controlling' device to interrupt power connections and means associated with said latching device to denergize said electro-responsive .l

means upon restoration of said accelerating device to starting position.

4. In aV motor controller, in combination,

means controlling the continuity of' the` motor circuit, a separately operable accelerating device biased to running position, means normall holding said device in starting position su ject to release by the former' means when operated to close the motor circuit, and means for automatically returning said device from running position tol starting position upon opening of the motor circuit by the first mentioned means.

5. In a motor controller, in combination, power actuated means controlling the continuity of the motor circuit, an accelerating device biased to' running position, means normally holding said device in starting position subject to release by the former means whenl operated lto close the motor circuit,

means' for automatically returning said de` vice from running position to starting position upon opening of the motor circuit by said former means and means Mfor rendering return of'said accelerating device to starting position prerequisite to operation of the first mentioned means to Yclose the motor circuit.

6. 'In a motor controller, in combination, a main switch controlling the continuity of the motor circuit an accelerating`device 'tending to move Arom starting position to running position and having electro-responsive means controlled by said switch to move the same to starting position upon interru ltion of the motor'circuit and means controllbd by said switch for retaining said device in starting position subject to release upon operation of said first mentioned means lto close the` motor circuit. l

7. In a motor controller, in combination, means controlling the continuity of the motor circuit, accelerating means tending to.' move from starting position to running position and having releasable mechanical means for retaining the same in starting position subject to release by said former means and electro-responsive means controlled by said first mentioned means to return saidA accelerating means to starting position upon interruption of the motor circuit and self-controlled to eect its own deenergization upon the aforesaid operation of said accelerating means.

8. In a motor controller, in combination, means controlling the continuity of the motor circuit, accelerating means tending to move from starting position to running position, electroresponsive means controlle by said frstmentioned means to return said accelerating means to starting position upon interruption of the motor circuit and having associated therewith means to eii'ect its denergization upon such operation, of said accelerating means, land other means to re.

tain said accelerating means in starting position subject to hautomatic release upon reclosure of the motor circuit.

9. In a motor controller, in combination, means controlling the continuity of the motor circuit, accelerating means -tending to move from starting position to running position, electro-responsive means responsive to return said accelerating means to starting position upon interruption of the motor circuit by said first mentioned1 means subject to release upon subsequent operation of said first mentioned meansv to reclose the motor circuit.

10. In a lmotor controller, in combination, means controlling the continuity of the motor circuit, accelerating means normally locked in starting position and subject to release by said first mentioned means upon closingV the motor circuit, said accelerating means when so released automatically mov'- ing to running position, and electrofresp'onsive means controlled by said first mentioned means to return said accelerating means to starting position upon interruption of the motor circuit.

l1. In a motor controller, in combination, means controlling the continuity of the motor circuit, accelerating means normally locked lin starting position and subject to release by said first mentioned means upon closing the motor circuit, said accelerating means when so released automatically moving to running position, and electro-responsive means controlled by said first mentioned lmeans to return said accelerating means t0 starting position upon interruption of they motor circuit, said last mentioned means having associated therewith means to deenergize the same upon return of said accelerating means to starting position.

12. In a motor controller, in combination, electro-responsive means controlling the continuity of the motor circuit, a control switch therefor, accelerating means tending to stand in running position and having electro-responsive means for moving the same to starting position yand interconnections between said means whereby the energization of said accelerating means is eii'ected by said first mentioned means upon interruption of the motor circuit and whereby return of said accelerating means establishes connections for energization of said first starting position subject to release by said main switch, electro-responsive means for returning sald -acceleratlng means to starting position, a switch in the energizing cir` cuit of said main vswitch associated with said accelerating means to insure against closure in the energizing circuit of said second-mem.

tioned electro-responslve means operable automatically to interruptsaid circuit upon return of, said accelerating means to starting position.

In witness whereof, I have hereunto subscribed my name in the presence of two witnesses.

'rHoMAs n. BARNUM. t

Witnessesr TEKLA BAs'r, L. A, WATsoN.