10 Sep
2014
10 Sep
'14
8:56 a.m.
On 09/10/2014 01:35 AM, Tothwolf wrote:
None of these small non-polarized electrolytics are
suitable for motor
start/run applications though, their ripple current rating is just far
to low. I have an antenna rotator with a 24V motor that I've been
completely unable to find a replacement motor run capacitor that will
fit in the controller's cabinet. The original looks to be a wax-paper
type, but it is only rated for 50VAC. The best option I've come up with
so far (not yet installed) is a pair of high ripple current rated
polarized electrolytics back to back in series.
Indeed, if one looks carefully at the nonpolar crossover caps, they
appear to be nothing more than back-to-back electrolytics. On the other
hand, I note that motor run capacitors have gotten a lot smaller over
the years, so a higher-voltage unit just might fit.
--Chuck