Patent GB-507747-A (GB)
Title: Improvements in systems for the combined electrical and mechanical transmission of mechanical power
IPC: H02P9/06
Filed: 1937-09-18
Abstract: 507,747. Transmitting mechanical power. SOUSEDIK, J. Sept. 18, 1937, No. 21506. [A Specification was laid open to inspection under Sect. 91 of the Acts, Feb. 19, 1938.] [Class 38 (iv)] A variable-ratio transmission system comprises a generator and a motor electrically connected, one element of the generator being driven by a prime mover while the other element, together with the motor, is connected to the final driven shaft, automatic means being provided for progressively increasing the field strength of the generator and decreasing that of the motor only when the speed of the prime mover exceeds a predetermined value. At high speeds a friction clutch mechanically couples the prime mover to the driven shaft. If a brake is applied to the generator field system the output of the generator may be utilized for other purposes. Operation of the field strength is effected by an auxiliary motor under the control of the operating handle. The prime mover V drives the armature of a generator G, the field system of which is connected by the dutch L1 to a shaft H1 geared to the final driven shaft R. The armature of the motor is also connected through n free wheel Y and similar gearing to shaft R. When the control handle P is moved from the idling position Q in a clockwise direction to the limiting position Kl, the fuel supply to the prime mover is gradually increased, while the auxiliary motor SM is started and operates contact bar 0 whereby the switches St3-St6 controlling resistances Sh are so connected that the fuel strength of the generator is first progressively increased while thereafter that of the motor is progressively decreased. When the eontact bar O reaches contact 18 on the controller, clutch L1 is de-energized and clutch P is energized to give a direct drive from the prime mover to the driven shaft R. The whole of the operating connections depend upon the blocking switch BS being in the position shown. Current for operating the various relays is supplied by a battery T which may be charged by an auxiliary generator A driven by the prime mover, a winding B operating switch St8 being included in this circuit to prevent operation of the clutches L, L1 when the engine is not running. When the contact bar R is in the end position shown, there is no electric connection between the generator and motor, but as soon as control arm P is moved so that sector 12 engages contact 10 a circuit through auxiliary motor SM is closed and contact bar O is moved steadily towards the right. In the first position contact is made with a sector 17 whereby a circuit through the winding operating switch St1 is energized thus connecting the generator G and motor M. The field circuit of the generator is at first shunted through resistances St3-St6. Further movement of the contact bar 0 cuts out these resistances in succession so that the strength of the generator field is progressively increased. These operations do not, however, take place unless switch 14 is closed by centrifugal device Rg on the attainment by the prime mover of a predetermined speed. When the contact bar reaches contact 25, the generator is fully energized and further movement of the control bar decreases the field strength of the motor by progressively switching in the same series of resistances. When the contact bar reaches contact 18 the output of the generator is passed through the small resistance W while further movement of the bar to contact 31 gives the direct drive by engagement of clutch L, clutch L1 being simultaneously de-energized. If the speed of the prime mover decreases so that contacts 14 open, motor SM is reversed and contact bar 0 moves backwards. This may be brought about also by returning the control handle P in an anti-clockwise direction to position K, the fuel supply to the engine being then also reduced to that required for idling. Specification 435,136 is referred to.