Determining if motor is turning or locked in sealed unit
Determining if motor is turning or locked in sealed unit
(OP)
I was wondering if I can determine if a sealed circulator
pump is rotating or locked up by analyzing voltage and current as in power factor, etc. I have and can use a HIOKI
analyzer, but do not know relation of phase angle to determining each state. Motor uses a capacitor start. Current is flowing, draws a nice arc, but can I prove rotation?
pump is rotating or locked up by analyzing voltage and current as in power factor, etc. I have and can use a HIOKI
analyzer, but do not know relation of phase angle to determining each state. Motor uses a capacitor start. Current is flowing, draws a nice arc, but can I prove rotation?






RE: Determining if motor is turning or locked in sealed unit
RE: Determining if motor is turning or locked in sealed unit
Power factor at locked rotor will be extremely low.
David Castor
www.cvoes.com
RE: Determining if motor is turning or locked in sealed unit
RE: Determining if motor is turning or locked in sealed unit
It is also possible that the capacitor makes power factor considerations less reliable when judging run/blocked from the measurements. In this case (90W) the power factor changes very little from locked to running condition.
I think that a simple check with a clamp-on ammeter and comparison to rated current is your best bet. Also, even if these little pumps are rather silent, it will usually be possible to hear if they are working if you use a stethoscope (or wooden stick) to listen to it.
Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Determining if motor is turning or locked in sealed unit
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Determining if motor is turning or locked in sealed unit
RE: Determining if motor is turning or locked in sealed unit
Rafiq Bulsara
http://www.srengineersct.com