Patent GB-191305793-A (GB)
Title: Power Transmission System.
Inventor: WILLIAM MORRISON
IPC: H02P9/00
Filed: 1913-03-08
Abstract: 5793. Morrison, W. Jan. 15, [Convention date]. Void. [Published under Section 91 of the Act.] Brush holders; commutators and collecting rings; electro-magnetic clutches; rotarymachines. -In power-transmission systems for automobiles in which both elements of a dynamo-electric machine are rotatable, one being connected to the prime mover and the other to the load so that the dynamo-electric machine may serve as an electro-magnetic clutch generating current delivered to a storage battery or mav be driven as a motor by the storage battery to start the engine, a separately-operated circuit-controller is provided for each of these alternatives. With one form of dynamo-electric machine described, provision is made for relative angular adjustment of the armature and field brushes to adapt the rotors for rotation in either direction. As described with reference to Figs. 1 and 2, the dynamo-electric machine has eight field coils shunted across the armature, in two groups, each group comprising two parallel sets of two in series. One controller connects the two groups in series, and the battery cells in series, when the dynamo-electric machine is used as a motor. The other controller puts the two groups in parallel, and the cells in parallel, when the machine is used as a clutch generator. The controllers, of drum type, are given a step-by-step movement, preferably by the pedalworked escapement mechanism described in Specification 5792/13, [Class 38 (v), Electric switches &c.]. The machine is proportioned so that, under normal conditions, the current generated. is at a voltage just above that of a single cell. Separate field-magnet poles D are carried by an open-ended drum C secured to the engine shaft A and an armature H with Gramme-ring windings is secured to the automobile driving-shaft. Commutator bars L are clamped in and insulated from a ring J carried by arms K bolted to the body of the armature. Two series of brushes Q, R are carried by rings O, N insulated from each other, supported by and insulated from arms P bolted to the drum C. The brushes are pressed against the inner face of the commutator by centrifugal force and by spring-pressed arms S, T. The brushes are connected by wires to their respective rings and the rings arc connected to their proper collector rings, of which there are four, 1, 2, 3, 4 mounted on and insulated from the end of the drum C. Brushes 6, 7, 8, 9 bearing against the rings and carried by a fixed part 10 of the automobile frame are connected to the controllers. The ends of the groups of field coils are also connected to the rings 1, 2, 3, 4. The preferred form of generator shown in Figs. 10 and 11 is drum wound, with conductors in slots of laminated cores, and comprises a rotor F<1> carried by the engine shaft A and a rotor H' connected to the load shaft B. The conductors (not shown) are connected to commutator bars F<Î>, I<1> clamped to their respective rotors between rings G', G<2>, K<1>, K<2>. The brushes for the outer commutator are carried by two rings P<1>, R<1> bolted to, but insulated from, each other, and an outer fixed casing L<1> which supports them. The inner commutator brushes are carried by rings U', V', bolted to but insulated from each other, and supported on the ring R' by bolts W<2> (with spring washers to give electric contact) engaging slots Y, so that the relative position of the armature and field brushes may be adjusted to adapt the rotors for rotation in either direction, as, for example, to enable the battery to drive the automobile forwards. The bolt W<2> may have a handle extending through the outer cover to facilitate this adjustment. Carbon brushes 2' are mounted in guides 3<1> with slotted walls allowing spring tension fingers 4<1> to follow up wear. Speed-changing arrangements such as engine throttling or change-speed gearing may be used in conjunction with the abovedescribed system.