GB211598A - Dynamo electric machine - Google Patents

Abstract

211,598. Suchostawer, D. Nov. 29, 1922. Rotary converters, transformers, and motorgenerators; motors with unwound iron armatures. -A motor-generator comprises attracted motnr elements 14 and generating armatures 22, mounted on a common shaft 11, and stationary, multipolar, linear magnets 7 which are energized so as to attract the elements 14 in sequence by means of a distributing switch 15 on the shaft. The elements 4 consist of curved wedge-shaped pieces of iron mounted on non-magnetic arms 13 at radii such as to bring them above the inwardlypointing pairs of pole-pieces 8 of the vertical series of U-shaped magnets, the coils 9 of which are connected to pairs of insulated flexible contacts 16 on the distributor. The contacts are connected to the input leads 18 through slip-rings 17 and are closed, so as to energize the magnets, until such times as they are opened by a stationary insulating projection 21. The top pole-pieces 8<a> energize wound armatures 22 which supply generated current to slip-rings 28 or to a commutator and slip-rings. In an alternative, form, several pairs of magnet columns of the type shown are arranged radially around a circle so that each attracted element is acted upon several times during the revolution. The distributor may be arranged to energize the magnet coils in series or parallel. One of the Provisional Specifications describes also the following : -The coils may be mounted on the rotor for cooperation with stationary attraction members. The current in the coils of either stator or rotor may be controlled by brushes and a cam device such that the coils are short-circuited prior to being de-energized, a resistance being put into the circuit while the coils are short-circuited. The distributor may consist of a circular member of insulating material rotating with the framing and carrying two pairs of contact plates, one pair being connected to the ends of one coil and the other pair to the ends of the second coil. Spring-actuated brushes carried by a stationary part of the machine co-operate with the contact plates and are connected to the supply terminals. A cam device on the circular member raises the brushes to short-circuit the coils and insert resistances in circuit at intervals. Another form of the machine may consist of a drum or frame carrying two outside dynamo stator magnets and a middle motor stator. The motor member is of the attracted iron type and carries brushes which co-operate with the dynamo stators.