US1315990A

US1315990A - Control system

Info

Publication number: US1315990A
Authority: US
Publication date: 1919-09-16
Anticipated expiration: 1936-09-16

Description

THEODORE H. SCHOEPF, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO WEST- INGHOUSE ELECTRIC AND MANUFACTURING COMPANY,

PENNSYLVANIA.

A CORPORATION OF CONTROL SYSTEM.

new and useful Improvement in Control Systems, of which the following is a specification.

My invention relates to control systems for electrically propelled vehicles and par-l ticularly to control systems for electrically driven motor trucks which are provided' with storage batteries.

One object of my invention is to provid a control system of the above'indicated character that shall insure a safe and economical operationof the motor or motors contained therein.

Another object of 'my invention is to.pro

vide a motor truck having a series-wound propelling motor, with means for insuring a safe operating speed of the motor in case the` same be relieved of the load thereon by the lrelease of the clutch, as when changing the transmitting gear. y

More specifically, my invention consists of an electric vehicle provided with a ser1eswound propelling motor and a storage batj teiy for exciting the motor and for additionally exciting the field lwinding in case the motor be relieved of the load thereon.- A clutch is provided for transmitting the driving effort of the motor to the vehicle wheels. A switch is disposed adjacent to the clutch and is adapted to be operated thereby. The switch connects a portion of the battery to the field; windings for additionally exciting the saine and thus prevent an excessive motor speed in case the clutch is released and the motor is relieved of the load thereon.

In the accompanying drawing illustrating my invention, Figure 1 is a diagrammatic view of a control` system constructed in accordance with my invention, and Fig. 2 is a modified control system.

The motor truck 1 is provided with front Y wheels '2 (one only being shown) and driving wheels 3 (one only being shown) which are mounted on a driving axle 1. A driving shaft 5, having a clutch 6 interposed intermediate its ends, is connected to the driving axle 4 by means of bevel gears 7 and 8 which form a portion of a differential-gear. A lever I9, connected to a rod 10, is adapted to control the operation of the clutch 6. In

means of a master controller MC1.

specification of Letters Patent. Patented Sept. 16, 1919.

Application filed May 8, 1916.

Serial No. 96,140.

portion 24 and an auxiliary portion 24a and to be controlled by al master controllerl MC. The master controlleriMC embodies a contact segment 25 which is adapted to engage contact fingers 26 and 27 and a contact seglment 28 which is adapted to engage

contact fingers

29, 30, 31, 32, 33 and 34: to short cir- .cuit resistors R1, R2, R3 and R4 when moved to positions o, Z), c, d and e. A ytwopole, double-throwswitch 35, having switch blades 36, is adapted to connect

contact terminals

37 and 38 and 39 andAtOto complete circuits from thestorage battery 23 to the A motor 2O when in the position shown.

When the switch is thrown to its reverse position, the switch blades 36 connect contact :

terminals

38 and 43 and d() and 44 to complete a circuit from the storage battery 23 to 'a charging receptacle 45.

Referring to Fig. 2 oit the drawing, a motor 50 having an armature 51 and a iield winding 52, is adapted to be energized by a storage battery 53 and to be governed by The master controller embodies a contact seg ment 54: which is adapted to engage

contact ingers

55, 56, 57, 58, 59 and 60 to short, circuit resistors R5, R6, R7 and R8 which are included inthe circuit/ot the motor 50. A three-pole, double-throw switch 461, having blades 62, 63 and 64, is adapted to

joint contact terminals

65 and 66, 67 and 68, and 69 and to connect the motor 50 to the storage battery 53 when in the position shown. 1When the switch is moved to its reverse posi-V tion', the switch blades 62 and respectively join contact terminals 66 and 68 to Contact terminals 71 and 72 so to complete a circuit from the battery 53 to a charging receptacle 73.

`Although the motor truck 1 is only partially illustrated, it is to ybe' understood that the same may be provided witli-the usual transmission and diierential gears common to motor cars. In order to simplify the drawing, no means is shown for reversing the field winding relative to thearmature winding in case it is desired to reverse the moto-r.

Considering the system illustrated in Fig. 1 to be in the position shown, the operation ot the same may be as follows. In moving the master controller MC to position a, two circuits are completed, one circuit extending from the auxiliary battery portion 24a through the field winding 22 and the sec- .ond circuit extending from the complete battery 23 through the motor 20. The first circuit may be traced from one terminal of the battery portion 24aj through contact fingers 26 and 27, which are bridged by the controller segment 25,

contact terminals

12 and 13, which are bridged by the contact segment 11, motor-field winding 22 and contact' terminals,

A

39 and 40, which are bridged by the switch blade 36, to the other terminal of the battery portion 24a. The second circuit may be traced from one terminal of the battery 23 through

contact terminals

37 and 38, which are bridged by a switch blade 36,

contact fingers

29 and 30 which are bridged by the controller segment 28, resistors R1, R2, R3 and Ri, motor 20, and

contact terminals

39 and 40, which arebridged by a switch blade 36, to the other terminal of the battery 23. Thus, the serieswound motor 2() is connected in series with the. battery 23, and the battery portion 24a. is connected to additionally energize field winding 22 in order to prevent an excessive speed ot the motor, as the same is running without a load thereon. In moving the controller to positions ZJ, c, d and e, the resistors R1, R2, R3 and R4 are suceessivelyexeluded from the motor circuit.

In case it is desired to start the motor car 1, the lever 9 is operated to throw the clutch 6 into its operative position. In moving the clutch 6 to its operative position, the

contact segment 11 is disengaged from the

contact terminals

12 and 13 to break the circuit from the battery portiJn 24a through the iield winding It, during the opera- Y tion ot' the motor oar, the clutch be released, the contact segment 11 again bridges the

contact terminals

12 and 13 to again establish a circuit from the battery portion 24a through the iield winding Thus, an excessive speed of the motor 20, by reason of the load being removed therefrom, is prevented..

In case'it is desired to charge the battery 23, the switch 35 is thrown to its reverse position so that one switch blade 36 bridges the contact terminals 38 and i3 and the second switch blade 3G bridges the contact terminals /10 and 441. A circuit is completed that may be traced from the charging receptacle 45 through contact tern'iinals et() and Lil which are bridged by the switch blade 36,` battery 23 and

contact terminals

38 and 43, which are bridged by the switch blade 36, to the battery-charging receptacle 45.

Considering the system illustrated in Fig. 2 to be in the position shown, the operation of the same may be as follows. In moving the master controller MC1 to position a, a circuit is completed from the battery 53 through the motor 50, which may be traced from one terminal ot' the battery through contact terminals 65 :and 66, which are bridged by the switch blade 62, contact fingers 55 and v56, which are bridged by the controller segment 54, resistors R5, R6, R7 and R8, motor 50 and the

contact terminals

67 and 68, which are bridged by the switch blade 63, to the other terminal of the battery 53. A second circuit is completed through a portion 53a ot' the battery 53 which may be tracedfrom the one terminal of the battery portion 53a throughcontact terminals 69 and 70, which are bridged by the switch blade 64,

contact terminals

18 and 19, which are bridged by the contact terminal 17, field winding 52 and the

contact terminals

67 and 68, which are bridged by the switch blade 63, to the other terminal ot' the battery portion 53a. Thus, the motor 50 is energized by the complete battery 53, and the field winding 52 is additionally energized by the battery portion In moving the master controller MC1 through positions 5, c, (Z and e, the resistors R5, R6, R7 and R8 are successively exA eluded from theycircuit of the motor 50.

In case the clutch 6 is operated in the system shown in Fig. 2, the contact segment 17 is disengaged from

contact terminals

18 and 19 to break the circuit from the battery portion'53a through the field winding 52 and thus relieve the field winding ofl its additional excitation. l

In order to recharge the battery 53, the switch 61 is closed in the reverse position so that the switch blade 65 bridges the contact terminals 66 and 71 and the switch blade 63 bridges the

contact terminals

68 and 72. A circuit-is completed which may be traced from the battery-charging receptacle 73 through

contact terminals

68 and 72, which are bridged by the switch blade 63, battery 53, and contact terminals 66 and 67, which are bridged by the switch blade 65, to the battery-charging receptacle 73.

The circuit connections,v the arrangement windings, and adapted to drive a mechanical load, a source of propulsive energy theren for, and an auxiliary source of means for increasing the excitation of the field wind ing relative tothe armature winding from said auxiliary source in case the motor is relieved of said mechanical load.

Q. In a control system, the combination with a motor having series-wound armature and field windings and adapted to drive a mechanical load and a battery for the motor comprising a main and an auxiliary source of energy, of means for connecting said auxiliary source ofenergy across the field winding in case the motor is relieved of said load. l

3. In a control system vfor an electric vehicle, the combination with an electric motor having armature and field windings gizing the motor', of an auxiliary storage battery embodying a portion of said -main battery, and means for connecting said auxiliary storage battery across said field winding in case the motor is relieved of said load. f

5. In an electric vehicle, the combination with an electric motor having series-wound armature and field windings and a clutch for transmitting the driving effort of the motor to the vehicle wheels, of means op- "erated by the clutch for controlling the excitation of the field winding.

6. In an electric vehicle, the combination with an electric motor having series-wound 4,

armature and field windings and al clutch for transmitting the driving effort of the motor to the vehicle wheels, of means for increasing the excitation of the field winding relative to 'the armature winding in case the clutch is released.

7. In an electric vehicle, the combination with an electric motor having series-wound armature and field windings, a storage battery comprising a main and an auxiliary source of energy for supplying energy thereto and a clutch for transmitting the driving effort of the motors to the vehicle wheels, of means controlled by the clutch for connecting the auxiliary source of energy in series with the field winding.

8. In an electric vehicle having a driving axle, the combination with a series type motor having armature and field windings, a clutch for connecting the motor to the driving axle and a source of energy for said motor, of means for increasing the excita tion 'of the field winding relative to the armature winding in case the clutch is released and the motor is relieved of the load thereon.

9. In' an electric vehicle having a driving axle, the combination with a motor having series-wound armature and field windings and a main storage battery for supplying energy thereto, a controller for governing the operation of the motor and a clutch for connecting the motor to the driving axle, ofan auxiliary storage battery embodying a portion of said main storage battery and means for connecting said auxiliary storage battery across thefield Winding in case the 'clutch is released while the controller is in mitting means Vfor increasing the excitation of the field winding relative to the armature winding. A

' 12. In anelectric vehicle, the combination with a main and an auxiliary source of energy, an electric motor having an armature and a yfield winding, and means for transmitting the driving effort of the motor to the vehicle wheels, of means Jfor operating said transmitting means and for connecting said auxiliary source in circuit4 with thel field winding. f

13. In an electric vehicle, the combination withV a. main and an auxiliary source of energy, a'n electric motor having an armature and a field winding, and means for transmitting the driving effort of the motor to the vehicle wheels, of means active when said transmitting means occupies an inoperative position for-"increasing the excitation of the 'field winding from said auxiliary source.

In testimony whereof I have hereunto subscribed my name this 24th day of April,

THEODORE H. S'CHOEPF.