Replacing 1uF 450V AC ?

[bianchi77]

Dear Members,
Is it possible for me replacing 1uF 450V AC (black color) with 470nF 275V AC (blue color)
It's fan capacitor.

Thanks

[eccerr0r]

Re: Replacing 1uF 450V AC ?

uh ... no...?

Half capacitance and half working voltage...that seems really far off?

The capacitance is dependent on the phase angle needed, should stick with what was calculated from the design...

[sam_sam_sam]

Re: Replacing 1uF 450V AC ?

It's fan capacitor.
Thanks

Because of this you need to have the right type of capacitor other wise the motor might not start running or run to fast and or over heat

I hope this helps

[bianchi77]

Re: Replacing 1uF 450V AC ?

can it be replaced with 2uF 475V VAC capacitor ?
Anyone knows how to calculate it ?

It's 240V AC 40W 50Hz motor in series with that cap, it's related with XL and XC impedance.

[eccerr0r]

Re: Replacing 1uF 450V AC ?

It depends on how the motor was constructed - how many degrees the rotor and the stator needs to be skewed in order to give maximum torque. Line frequency is only part of the equation and it's the only fixed portion that we can even assume...

You can try substituting if you wish. There's no guarantees expressed or given, but the voltage rating must be honored else you likely will end up with a fire.

[bianchi77]

Re: Replacing 1uF 450V AC ?

It depends on how the motor was constructed - how many degrees the rotor and the stator needs to be skewed in order to give maximum torque. Line frequency is only part of the equation and it's the only fixed portion that we can even assume...

You can try substituting if you wish. There's no guarantees expressed or given, but the voltage rating must be honored else you likely will end up with a fire.

Ok, thanks for the info, in this case I need 475 V AC voltage rating must be honored, got it.