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Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
I work with a supposed Electrical Engineer who is from a third world country and he continues to tell me while we were fixing a motor conveyor that its possible to run a 3 phase motor off single phase using a single capacitor. Its sort of scary working with him on 240/480 when he talks like this.
Is this advisable ? Ive scene some sketchy youtube videos showing how to do it but it seems like this should cause phase distortion, power factor heating, motor heating, circuit breaker heating and speed/torque issues. All of which would lead to a short life and unstable rotation. And is the capacitor vulnerable to catching on fire or failing in some way ?
Registered Member #65
Joined: Thu Feb 09 2006, 06:43AM
Location:
Posts: 1155
Depends on the motor, but it sounds a little dangerously muddled for general advice. He probably means the lag capacitor on smaller AC motors, which among other things usually ensure it spins in the right direction.
Jam a current-controlled VFD and output-conditioner on a switching-rated motor if you are ever unsure of the power quality or $/hp. Also, a magnetic safety interlock switch is usually a code requirement in most places where amputations are not a business opportunity.
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1714
If the motor runs, wired his way, some simple measurements might give you confidence or not. How could you be abusing the motor if its three phase currents, and its three phase-to-phase voltages, are roughly matched? I agree with need for proper start/stop button switch, for safety in case of power outage etc.
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Is it Advisable to Run a 3 Phase Motor Off of 1 Phase using a Capacitor ?
