GB917263A - - Google Patents

Abstract

917,263. Homopolar machines. REINERS, W., and WIGGERMANN, G., [trading as REINERS & WIGGERMANN]. March 3, 1959 [March 3, 1958; April 3, 1958], No. 7326/59. Class 35. In a homopolar machine, the current conductors are on the stationary member instead of on the rotor as is usual, and the coaxial field coil is also mounted on the stationary member. In the form of the invention shown in Fig. 1, the rotor B carries annular poles 5, 6 co-operating with slotted stator poles 3, 4 carrying slot-conductors 10, interconnected in series or parallel through apertures 11, in the stator core A. Excitation is provided by a fixed coil F, or by permanently magnetizing the rotor core B. The stator core may be slotted or split to facilitate winding. In a modification (not shown) the outer member may rotate. The E.M.F.'s generated in the two stators are of opposite sense, but in the modification shown in Fig. 3, the rotor consists of two oppositely-rotating parts B, C to make the stator voltage progressively in the same direction. In this form, the conductors are replaced by a magnetic or non- magnetic bush or plating layer 18 extending across both stators in series. This type of machine, besides acting as an A.C. or D.C. motor when suitably excited, will also operate as a coupling, one rotor generating and the other motoring. In a further modification, the bush 18 may be centre-tapped. Moreover, the conductor bush 18 may have helical slots (not shown) giving the current a rotational component to strengthen the excitation field. If desired, conical air-gaps may be used to avoid the use of the curved rotor laminations shown. In the modification shown in Fig. 5 the stator cores A are situated between separate oppositely-rotating rotors B, C excited by concentric stationary field coils F. The stator conductors 27 are cross-connected to provide series-addition of voltage. Having two rotors, this form may also be used as a coupling. Various combinations, applications and driving arrangements of the above-described forms of the invention and suitable shunt and series excitation arrangements are described. Where the conductor bush needs to be short-circuited for power transmission this may be done through a concentric tubular conductor inside the central core (Fig. 19, not shown). The ratio of power transmission arrangements may be automatically regulated by axially moving at least the rotor core of the motor element (Fig. 20, not shown). The machine cores may be of powdered material, e.g. carbonyl iron sintered or bonded by resin or ceramic.