Patent GB-190904472-A (GB)
Title: Improvements in and relating to Controllers for Dynamo-electric Motors.
IPC: B60L15/00
Filed: 1909-02-23
Granted: 1910-02-17
Abstract: 4472. Allgemeine Elektricitõts-Ges. Feb. 24,1908, [Convention date]. Controllers, actuating and locking mechanism and interlocking - devices for; controllers, drum; systems for continuous-current motors only; electric braking.-A motor-controller adapted for seriesparallel control has a loosely-mounted cut-out drum switch for each motor or group of motors. These switches are arranged to effect short-circuit braking, and carry contacts which, after the disconnexion of a motor or group of motors, make connexions for the running and short-circuit braking of the remaining machines. Two motors 25, 25<1>, with fields 26, 26<1>, are shown in Fig. 1 in connexion with the loose drum switches 29, 29<1> and a regulating-switch 28 with nine running- positions and with six braking-positions. Clutch members 33, 33<1> are pivoted to plates 31, 31<1> secured to the drums 29, 29<1> of the brake switch, and slotted collars 34, 34<1> are fixed to the shaft 30. The members 33, 33<1> may be turned into engagement with the collars 34, 34<1> to lock the drums to the shaft ; or the drums may be disengaged from the shaft by turning the members 33, 33<1> into engagement with slotted bars 35, 35<1> placed as near as possible to the collars 34, 34'. An interlock may be provided, so that the regulating-switch cannot be moved into the parallel positions when one of the drums 29, 29<1> is inoperative. When both drums are coupled to the shaft 30 and are in position X, a circuit is completed as soon as the regulating-switch is moved to its first position. Current flows through the contacts 1, a, 2, and 1, a', 2<1>, in parallel, then through the contacts 11, i, 16, resistance 27, contacts 12, 7, c, 8, armature 25, contacts 10, d, 9, field 26, contacts 4, b, 5, 20, k, 19, 6<1>, c<1>, 7<1>, armature 25', contacts 9<1>, d', 8<1>, field 26<1>, and contacts 24, m, 23. The controller in the next four positions cuts out the starting-resistance 27. In position VI, the motors are connected in parallel and further movement cuts out resistance. For braking, the drums 29, 29<1> are moved into position X<1>, and the controller is moved into position I'. A current flows through the contacts 3, e, 2, and 3<1>, e<1>, 2<1>, in parallel, contacts 11, r, 17, resistance 27, and contact 12 ; then it divides, passing through the two motors in parallel, and the two parts unite again at contacts 22, 23. The controller 28 can be moved into the positions II<1>, III<1>, &c., to cut out resistance. Either of the drums 29, 29<1> may be disconnected from its shaft, and one motor alone may be used for running or braking. In a modification, one of the drums may be displaced 180 degrees from the other and coupled to the shaft 30 in that position by means of pivoted arms 33, 33', which may be moved to engage slotted rings 34. Figs. 5 and 7, secured to the shaft. The loose drums may be used as running-switches as well as brake and cut-out switches. The drum shaft 30, Figs. 9 and 10, carries a loose disk 40, which is engaged by a pin 39 operated from the controller-shaft 37. The disk 40 is pressed upwards by a spring 41 to engage a toothed collar 43 secured to the shaft, so that the shaft 30 is turned by the operation of the shaft 37. A collar 45, which is loose on the shaft, carries the handle 44, and at its lower end carries two projections 46. These projections pass over the collar 43 and engage the disk 40 when the handle 44 is depressed. As the disk drops, a slot in it passes over a projection 50<1> on the casing and the disk is held locked after it has been disengaged from the collar 43. The slot 47 in the collar 45 engages the projection 47<1> on the collar 43, so that the shaft 30 can be rotated by the handle 44 until the projection 48 reaches another slot, not shown, and the handle 44 is again locked against turning. This arrangement for coupling the shaft 30 with the disk 40 or the handle 44 may be varied by employing another shaft with suitable gearing to operate the disk 40. The handle 44 may be on a countershaft connected by links to an axially movable collar on the shaft 30.