Patent GB-369952-A (GB)
Title: Improvements in or relating to electric motors
IPC: H02K7/10
Filed: 1930-09-18
Abstract: 369,952. Motor driving-arrangements. BLANK, E., 83, Devinska cesta Karlova- Ves, near Bratislava, Czecho-Slovakia, Sept. 18, 1930, No. 27978. Convention date, Sept. 18, 1929. [Class 35.] In an electric motor wherein both members are rotatable and connected by sun-and-planet gearing, the gear ratio is such that the ratio of the speeds of the primary and secondary members when the driving shaft is held stationary is the inverse ratio of their moments of inertia. In the form shown in Fig. 1, the primary 6 and secondary 1 are interconnected by the internally-toothed wheel 10 on the end bracket 12 of the primary, the wheel 9 which rotates with the planet 8 on the pin 11, and the sun 7. Braking of the primary 6 by the band 14 causes the crank 15 attached to the driven shaft 16 to rotate. A centrifugal brake may also be provided, for example for a series machine, to prevent the outer member racing. The Specification as open to inspection under Sect. 91 (3) (a) comprises also a modified arrangement for driving a generator at a speed lower than the driving-engine speed, land its voltage or frequency may be varied by braking the stator. The crank carrying the planet may be duplicated and provided with a second planet or a counterweight. The gears may also be arranged to give two or three speeds simultaneously. In the form shown in Fig. 8 (Cancelled), 40 and 42 are gears on the motor elements, and the crank 15 which is connected to the common shaft of bevels 41, 43 drives the hollow shaft 16 connected to the pulley 18 by a clutch operated by the rod 47 controlled by the bell-crank lever 45, 46 and the weight 39. The pin 53 on the crank 15 carries a wheel 55 meshing with teeth on a stationary bush 51, and a wheel 54 driving 52 on the sleeve 49 which is thus driven at a speed different from 16 when the outer member is braked. The members 49 .. 55 may be omitted if desired. In Fig. 9 (Cancelled), the pin 53 is not fixed to the crank 15 but its wheel 55 meshes with 59 on the shaft 16 whilst its wheel 54 is in mesh with 52 on shaft 49 and with an internal gear 58 mounted on rollers 60 and arranged for connection to the outer motor member by a lever when it is desired to drive the shaft 49. When the gear 58 is loose and the outer member braked, only the shaft 16 is driven. In Fig. 10 (Cancelled), the shaft 61 carries a crank pin 75 with a gear 63 meshing with a wheel on shaft 16 and with an internal gear 64 on the shaft 62. The toothed boss of 64 meshes with 65 on crank pin 66 which is connected with a sleeve 67 carrying a brake drum 69 and surrounding loosely the shaft 62 fitted with a pulley 70. The ends of the shafts 16, 61 are connected with clutch discs 71, 72, either of which can be connected to a loose pulley 73 by the double-conical ring 74. Shafts 16, 61. and discs 72, 71 rotate in the same direction but at different speeds while the pulley 70 rotates in the opposite direction when the brake 69 is applied or stands still when the brake is off. An oil sump may be provided for the planet gear. This subject-matter does not appea,r in the Specification as accepted.