A capacitor is wired in series with this coil and it has the effect of causing a shift in the phase of the current in the auxiliary winding relative to that of the main winding. To solve the problem an auxiliary, usually weaker, winding is added to the motor and it is offset from the main coil by, say, 30°. The single phase induction motor is similar. Induction motor with square rotor because there is no circle tool in the schematic editor. Simulate this circuit – Schematic created using CircuitLab It's OK once you get it going but trying to get the start direction right and starting from top or bottom dead-centre is awkward. Trying to start a single phase motor with only one winding would be a bit like trying to start a bike with only one pedal. Lastly, is the capacitor placed between (downstream from) the start windings and neutral, or could it be wired between incoming voltage and the windings? When voltage on the hot leg oscillates down to zero, does the capacitor discharge back toward the starter windings, or does current flow through the capacitor to the neutral leg?īasically I don't understand where the capacitor's charge goes when the hot leg is hot and when it is not. But I don't know how the voltage and current behave.ĭoes voltage energize the hot leg, flow through the start windings and then charge the capacitor? So, a capacitor is wired in series with the start windings which I kind of understand. Problem there I guess is that both windings would be in phase and thus no spin created for the rotor. Without a capacitor, the same thing would happen to the start windings. Wiring diagrams seem to suggest that voltage energizes the hot leg of the circuit and current flows through the run windings and then returns via the neutral leg. I don't understand the direction of current flow when a capacitor is wired in series with the start windings in, say, a fridge or other AC motor running at/under 120V AC.
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