H - Electricity – 02 – P
Patent
H - Electricity
02
P
318/111, 321/89
H02P 7/06 (2006.01) H01F 29/06 (2006.01) H02M 7/04 (2006.01)
Patent
CA 1157091
769.002 S P E C I F I C A T I O N VARIABLE VOLTAGE DIRECT CURRENT POWER SUPPLY AND MOTOR SPEED CONTROL INVENTOR: STANLEY G. PESCHEL ABSTRACT OF THE DISCLOSURE A continuously variable voltage direct current power supply is provided using a variable transformer with a core of magnetically permeable material which is encircled by at least one electrical winding, with segments of the turns of the winding being exposed along two spaced traverse paths for electrical contact by movable brushes. First and second electrically conductive brushes are sumultaneously movable along the respective traverse paths of the winding, with at least one of the brushes at all times contacting an exposed segment of the winding. First and second bridge rectifier circuits couple the first and second brushes to the same DC electrical load. The first and second bridge rectifier cir- cuits are coupled in parallel between the respective brushes and load circuit. Turn-to-turn short-circuit AC current be- tween the adjoining turns contacted by the brushes is eliminated by employing a transformer winding having a turn-to-turn voltage which is less than the forward turn-on voltage through two or more rectifiers (unidirectional conduction devices). Turn-to-turn current can only flow from one brush to the other through at least two rectifiers plus the resistance or impedance of the electrical load. Where it is de- sirable to utilize higher turn-to-turn voltages, more than one rectifier can be connected in series in each branch of the rectifier circuits. In those cases where the DC load can function with a relatively minor component (approximately one percent or so)of superimposed AC current, then irrespective of the turn-to-turn voltage and the number of rectifiers in series, the turn-to-turn current circulating from one brush to the other through the load is held to an insignificant value by the load resistance or impedance itself. The variable transformer which is utilized may include both primary and secondary windings or an autotransformer may be utilized. Single-phase or multi-phase variable transformers can be used in this DC power supply, and advantageous DC power control can be effectuated on a considerably more economic basis than heretofore, for example, to control the speed of large (multiple Horse Power) DC motors. - 2 -
371284
Peschel Stanley G.
Westell & Hanley
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