Can you change 50 v micro farad capacitor with a 63 v 100 microfarad capacitor?

Answer 1

Generally, yes - a 35 uF capacitor is close in value to a 30 uF capacitor - but it depends on the circuit requirements. If you are talking about a tuned filter, I would say no. If you are talking about a power supply filter, I would say yes. Just keep in mind that it takes more current to charge a larger capacitor, so you need to consider the current rating on the diode(s). Of course, if this mattered in a power supply, then I would also say that the design margins are too tight. Again, 35 versus 30 is not a big difference - again, sometimes. Also, you need to ensure that the voltage rating of the new capacitor is equal to or greater than the voltage rating of the old capacitor.

I've received a message that this capacitor is a motor starting capacitor in an air conditioner. My answer is this...

Then I would consider it a tuned circuit, because phase angle of the power in the start windings would matter to the proper starting of the motor. However, my root analysis holds - you need to consider the system's design requirements.

If any motor engineers out there are willing to take a stab at this, please do. I have flagged the question to attempt to get a better answer.

Answer 2

no