| 摘要 |
1524595 Converting L RUGGERI 10 Aug 1976 [13 Aug 1975] 33239/76 Heading H2F An electrical A.C. to D.C. conversion device comprises a conductor 21 having an elongated cross-sectional shape and disposed in a slot in a ferromagnetic laminated core 27, the walls of this slot being arranged to be just magnetically saturated by an external magnetic control field due to a control coil 20 so that when a positive half cycle of current flows through the conductor 21 the additional flux 31 due to this current aids the control field 30 and drives the walls further into saturation so that no eddy currents flow and the conductor 21 conducts a maximum of current, but when a negative half cycle of current flows through the conductor 21 the flux due to this current opposes the control field, the walls of the slot are unsaturated and eddy currents flow therein inducing back e.m.f., and thus current opposing the current in conductor 21 so that the current in that conductor is reduced to a minimum. The conductor 21 preferable has a T-shaped cross-section. Fig. lb not shown. In addition by changing the value of the no-load magnetic bias flux due to the control field regulation of current in conductor 21 is also achieved. Full wave forms of the conversion device having two conductors 21, 22 are also described, Figs. 6, not shown and Fig. 7, and in these embodiments the control field may be constant when one conductor conducts a maximum while the other conducts a minimum of current, or varying when both conductors are made to conduct a maximum or a minimum of current simultaneously. An embodiment of the device having a plurality of conductors with cyclic variation of the control field is described, Fig. 10, not shown, this device having a stator, carrying the control windings wound on poles, within which is a rotor carrying the conductors in slots. The poles carrying the control windings may be alternated with unwound poles, and alternative configurations of the rotor slots and conductors are described, Figs. 12a, 12b and 14, not shown. |
