ElectricalMaintenance
Member
- Location
- Ontario, Canada
Hello. This is my first post.
I do maintenance at a manufacturing facility. We have been having problems with small shaded pole motors burning out. They are intermittent duty rated, 230V single phase, 50/60Hz. They run for a few seconds at a time with a few seconds rest in between, and one longer rest every minute. They also run basically 24hrs a day. After a few months they start blowing fuses and show very low resistance on the coil (5 ohms when they should read 60 ohms brand new).
One of our senior electricians said it would be fine to connect these to 208V 3-phase and just use 2 phases instead of single phase 230V and neutral. But I suspect that this is the reason why they keep burning out after a few months. The shaded pole motor creates it's own second phase, so wouldn't using 2 phases create a frequency problem, or perhaps eddy currents that are damaging the winding insulation? Either that, or they are starting and stopping too frequently.
Thanks!
I do maintenance at a manufacturing facility. We have been having problems with small shaded pole motors burning out. They are intermittent duty rated, 230V single phase, 50/60Hz. They run for a few seconds at a time with a few seconds rest in between, and one longer rest every minute. They also run basically 24hrs a day. After a few months they start blowing fuses and show very low resistance on the coil (5 ohms when they should read 60 ohms brand new).
One of our senior electricians said it would be fine to connect these to 208V 3-phase and just use 2 phases instead of single phase 230V and neutral. But I suspect that this is the reason why they keep burning out after a few months. The shaded pole motor creates it's own second phase, so wouldn't using 2 phases create a frequency problem, or perhaps eddy currents that are damaging the winding insulation? Either that, or they are starting and stopping too frequently.
Thanks!