Capacity-movement model AC inductive motor switch-changeover capacity-type speed control circuit

Claim 1

In a switching arrangement for delivering power to an A.C. induction motor having a running winding and a start winding, an improvement comprising a first capacitance, a second capacitance, a resistance and a four-position switching means for selectively interconnecting in three differing configurations said running winding, said start winding, said first capacitance, said second capacitance and said resistance across an A. C. power source in respective ones of three positions of said four-position switching means, said four-position switching means in a fourth position effecting a disconnection of the induction motor from the A. C. power source, wherein said four-position switching means is constituted by a first four-position switch having a first conductive lug, a second conductive lug, a third conductive lug, a fourth conductive lug, a fifth conductive lug and a sixth conductive lug, said first, said second and said third conductive lugs being conductively connected and said fifth and said sixth conductive lugs being conductively connected, and by a second four-position switch having a seventh conductive lug, an eighth conductive lug, a ninth conductive lug, a tenth conductive lug, an eleventh conductive lug and a twelfth conductive lug, said seventh and said tenth conductive lugs being conductively connected and said eleventh and said twelfth conductive lugs being conductively connected; wherein said fifth lug and said sixth lug are conductively connected to first ends of said running winding and said start winding, and said eleventh and said twelfth lugs are conductively connected to the other end of said running winding; wherein said first capacitance is a first capacitor connected between said seventh lug and the other end said start winding, said resistance is a resistor and said second capacitance is a second capacitor, said resistor and said second capacitor being connected in series with one another between the eighth lug and the other end of the start winding; wherein when said first switch and said second switch are in a first position, said first, said second and said fifth lugs are conductively connected to each other, and said seventh, said eighth and said eleventh lugs are conductively connected to each other; wherein when said first switch and said second switch are in a second position, said first, said third, said fifth and said sixth lugs are conductively connected to each other, and said seventh, said ninth, said eleventh and said twelfth lugs are conductively connected to each other; and wherein when said first switch and said second switch are in a third position, said third, said fourth and said sixth lugs are conductively connected to each other, and said ninth, said tenth and said twelfth lugs are conductively connected to each other.