US1367118A - System of control - Google Patents

Description

A. H. CANDEE.

SYSTEM OF CONTROL.

APPLICATION FILED JUNE 15, 1917.

Patented Feb. 1, 1921.

5 e 5 Z we Td 5 N H E E4 w w a w 0 E I. r m d N m wmm u ww mm i n w W ATTORNEY UNITED STATES PATENT I OFFICE.

ANDREW H. CANDEE, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO WESTING- HOUSE ELECTRIC & MANUFACTURING COMIANY, A CORPORATION OF PENN- BYLVANIA.

Be it known that 1, ANDREW H; OArInnn, a citizen of the United States, and a resident of Pittsburgh, in the count of'Allegheny and State of Pennsylvania, ave invented a new and useful 1m rovement inSystems of Control, of which t e following is aspecification.

My invention relates to systems of control and particularly to systems of control for electric railway vehicles.

One object of my invention is to provide a system of the above indicated character that shall open the circuit of a motor under predetermined conditions and prevent the operation of the motor until the motor-governing controller is-returned to the oii position.

Another object of my invention is to provide a system of control for an electric motor that shall be provided with a line switch for closing the motor circuit and means for pre venting the operation of the line switch under predetermined conditions. I

Another object of my invention is to provide a control systemof the above indicated character that shall be provided with a switch for closing the motor circuit, a controller for governing theoperation of the motor, an overload-trip switch and a plurality of interlock switches for releasing the line switch under predetermined conditions,

- and means for preventing the operation of the line switch until the controller is returned to the oif posit10n, in case the line switch is released when the controller is 1n 7 an operative position.

In electric-railway-vehicle-control systems now m service are severally embod1ed means for energizing a line switch for completing a circuit through a motor when the motorgoverning controller is moved to its first operative position and means, as, for example, door-interlock switches .or a slip segment of well known type, for releaslng the line switch under predetermined conditions when the controller is in an operative position. Howeven'in each ofthe systems of the type above indicated, the hue switch is operated to complete the motor circmt momentarily when the controller is returned through the first operative posltion and thus gives the car an unnecessary jolt.

ln-a system embody ng my 1nvent1on, a

Specification of Letters Patent.

' by means of'a line switch Patented Feb. 1, 1921-.

1917. Serial No. 174,933.

line switch is o erated to complete the motor circuit when t e controller is in the first operative position but means is provided, in case the line switch is released when the controller is in an operative position, for preventmg the operation of the line switch again until the controlleris returned to the ofi position and thus preventing the unnecessary jolt to the vehicle that is encountered in systems now in service, when the controller is returned to the first operative position.

The single figure of the accompanying drawing is a diagrammatic'view of a control system embodying my invention.

In the accompanying drawing, a motor 1, embodying an armature 2 and a field winding 3, is adapted to be connected across a supply circuit comprising a trolley conductor 4: and a ground-return conductor 5 6 and a controller 7. I

The controller 7 embodies a contact segment 8 for engaging contact fin ers 9 and control circuits to the trolley conductor 4,

contact segment 11, which is adapted to engage the contact fingers 12 13, 14, 15 and 16 for excluding resistors ltl, R2 and R3 from the circuit of the motor 1, and a slipcontact segment 17 which is adapted to engage the contact fingers 18 and 19, when the controller is moved in a'forward direction, for a, purpose to be described later.

The slip-contact segment 17 is mounted upon a slip ring 20 that is frictionally attached to; the controller 7 and is provided with two projections 21 and 22 which are respectively adapted to engage a stationary pin 23 when the controller is moved in a forward and in a reverse direction. Thus,

when the controller is moved in a .forward' ages the direction, the projection 21 en pin 23, and'the contact segmentl is maintained in engagement'with the contact fingers 18 and 19, and, when the controller is moved in a reverse direction a predetermined distance, the projection 22 engages the pin 23, and the contact segment 17 is disengaged from contact with the fingers 18 and 19.

The line switch 6 is provided with an operating coil 24 and two interlock switcheq 25 and 26, for a purpose to be described later.

v An auxiliary switch 27, which is adapted to bridge contact terminals 28 when in an operative position and to bridge con-- line switch until the controller is returned to the off position in case the line switch is released when the controller is in an operative position.

Two door interlock switches 30 and 31 and an overload-trip switch 32 are provided for deenergizing the coil '24 of the line switch in case a door of the vehicle is opened, or in case an excessive current passes through the motor.- The coil 24 of the line switch 6 is adapted to be connected across a portion of a resistor 33, which is connected between the supply-circuit conductors, and the coil of the auxiliary switch 27 is adapted to be connected across the supply circuit through a resistor 34.

Assuming the various control apparatus to be in the position illustrated in the'drawing, the motor 1, may be connected across the supply circuit when the master controller 7 is moved to position a. In position a of the controller 7, acircuit is completed from the trolley. conductor 4 through the contact fingers 9 and 10-which are bridged by the contact segment 8a portion of resistor 33, overload-trip switch 32, coil 24 of the line switch, contact terminals 29which are bridged by the movable member of switch 27-contact fingers 18 and 19-which are bridged by the slip segment 17--and interlock switches 30 and 31 to the ground-.

return conductor 5. Thus, the line switch 6 is operated to complete a circuit from the trolley conductor 4 through the line switch 6, contact fingers 12 and 13which are brid ed by the contact segment 11-resistors R1, 2 and R3, coil of the overload-trip switch 32 and motor 1 tothe ground-return conductor 5.

28. A holding circuit for the line switch 6' is completed through the interlock switch 25 previous to the opening of the energizing circuit therefor, by the operating of the auxiliary switch 27-.

' i In positions b, c d of the controller 7,

the resistors R1, R2 and R3 are successively excluded from the circuit of the motor 1.

In case the circuit for the coil 24 of the line switch 6 isbroken by means of the slip segment 17 or the overload-trip switch 32, or the door interlock switches 30 and 31, the line switch is released and the circuit of the motor 1 is broken. The holding circuit for the coil of theauxiliary switch 27 fromthe trolley conductor 4 through the contact fingers 9 and 10which are bridged by the contact segment 8resistor 34, contact terminals 28-which are bridged by the relay 27-aiid the coil of the relay 27 to the ground-return conductor 5 is maintained closed until the controller 7' is returned to the off position to disconnect the contact segment 8 from the contact fingers 9 and 10.

Inasmuch as the line switch 6 cannot be operated while the auxiliary switch 27 is in an operative position, it is apparent that, if theline switch is released when the-controller is in an operative position, it is impossible to operate the lineswitch and complete the motor circuit until the controller is returned to the off position.

. Modifications inthe system and arrange ment and location of parts may be made within the spirit and scope of my invention and such modifications are intended to be covered ,by the appended claims.

- I claim as my invention:

1. In a system of c ntrol, the combination with a motor'and a ontroller for governing the operation of'the motor, of means for breaking the circuit of the motor under predetermined'conditions when the controller is in an operative position, and a switch energized in all operative positions of said controller for preventing. the reclosure of the motor circuit ulntil the controller is returned to the off position.

2. In a system of control for an electric vehicle, the combination with a motor, and a controller for governing the operation'of the motor, of means for openin the motor or the controller is moved in a reverse direction a slight amount from an operative position, and means for reventing the reclosing of the motor circuit until the controller is moved to the ofi position.

3. In a system of control foran electric Vehicle, the combination with a motor. a line switch for completing the motor circuit, and a controller for governing the operation of the motor, of an auxiliary switch for efiecting the operation of the line switch to complete the motor circuit when the controller is in the first operative osition and for preventing, when energize the operation of the line switch when the same has been released until the controller is returned to the ofi position.

4. In a. systemof control, the combinecircuit in case a door of the vehic e is opened troller for governing the operation of the" motor, of means for releasing the line switch, under predetermined conditions, to

open the motor circuit when the controller is in an operative position, and an auxiliary switch energizedin all operative positions of the controller for preventing the operation of the line switch until the controller is moved to the off position.

5. In a system of control, the combination with a motor, an electrically-operated line switch for completing the circuit of the motor, and a controller for governing the operation of the motor, of means comprising interlock switches for deenergizing the coil of the line switch, under predetermined conditions, when the controller is in an operative position, and an auxiliary switch initially closed by the line switch and adapted to prevent, when energized, the operation of the line switch until the controller is moved through the off position.

6. In a system of control, the combination with a motor, an electrically-operated line switch for completing the circuit of the motor, and a controller for Q'OVQTIIIDQ' the operation of the motor, of an overload-trip switch inserted in the circuit of the operating coil for said line switch and having an energizing coil in the motor circuit, and means for. preventing, when energized, the operation of the line switch until the controller is returned to the off position in case the line switch is released by the overload: trip switch when the controller is in an operative position.

7. In a system of control, the combination with a dynamo-electric machine and a controller for governing the operation thereof, of means for closing the circuit thereof, and initially inoperative means to permit the action of the first means in the firstoperative position of the controller and thereafter operative to prevent repetition of such action after the opening of the first means until the machine circuits resume their original condition.

8. In a system of control, the combination with a dynamo-electric machine and a controller therefor, of means for closing the machine circuit, and an initially inoperative switching device to permit the action of said means in the first operative positionof the controller and thereafter operative to prevent repetition of such action after the opening of said means whenever the controller occupies an operative position.

9. In a system of control, the combination with a dynamo-electric machine and a controller therefor, of a switch for closing the machine circuit, and a relay device hav ing contact members in the switch-controlling circuit and having an actuating coil energized by the closure of said switch, and an additional energizing circuit for said device.

10. In a system of control, the combination with a dynamo-electric machine. and a controller therefor, of a switch for closing the machine circuit, and a relay device having contact members in the switch-controlling circuit and having an actuating coil energized by the closure of said switch, and a holding circuit for said device energized only upon the closure thereof under operating conditions.

-11. In a system of control, the combination with a dynamo-electric machine and a controller therefor, of a switch for closing the 1 machine circuit, means dependent upon the current traversing the machine for releasing said switch, and an initially inoperative relay device to permit the closure of said switch in the first operative position of the controller and thereafter operative to prevent re-closure after the operation of said means until the controller occupies a predetermined position.

In testimony whereof, I have hereunto subscribed my name this 28th day of May,

ANDREW H. CANDEE.

Images