Here is a (somewhat) detailed article on motor run capacitors. When they are damaged they tend to drop in capacitance. From a motor manufacturer, a graph that comes closer to answering your question but does not really tell you how much temperature derating you'll have to do etc.
Solution: After a long period of time, the accumulated charge on the capacitor's plates will produce a voltage across the capacitor that is equal to the voltage across the power supply. At that point, there will no longer be current in the circuit.
Basically, I have no idea about electrical engineering. As old oil-filled capacitors dry out, the capacitance goes down and the can't pass as much AC current. This type of motor is called "capacitor run induction motor". In order to create a rotating magnetic field, the capacitor is there to create a phase shift for one of the two motor windings.
Once charged to its maximum possible Q, the capacitor's plates are separated by a factor of four (that is, the distance between the plates is quadrupled) while the capacitor is kept hooked to the power supply. As a consequence of this change in geometry:
It probably won't work (at least for a normal induction motor) and you certainly won't find a suitable variable capacitor. Is the motor an induction motor or brushed motor? Have a read through this similar question.
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As old oil-filled capacitors dry out, the capacitance goes down and the can''t pass as much AC current. This type of motor is called "capacitor run induction motor". In order …
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