WYE Motor Connections
WYE Motor Connections
(OP)
What will happen if on a WYE connected motor TI, T2, and T6 are connected to the power circuit and T4, T5, and T1 are connected together?
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RE: WYE Motor Connections
RE: WYE Motor Connections
RE: WYE Motor Connections
Your gonna have a shift phase, the motor will run WITH HIGH AMPERAGE AND WILL SOUND STRANGE LIKE is like a two phase operation.
Regards
Petronila
RE: WYE Motor Connections
"TI, T2, and T6 are connected to the power circuit and T4, T5, and T3 are connected together" ?
Also I assume T1, T2, T6 connected in same rotation sequence as would normally connect T1 T2 T3.
One thing for sure is that you definitely cannot predict any reliable operating mode of the motor. It may overheat and may have abnormal current or vibration or other problems.
With that said, trying to analyse the connection I get an unusual result. You will have converted FROM
a b' c a' b c' etc
TO
a b c a' b' c' etc
The fundamental component of the resulting magnetic field rotates at one-half the original speed. So it seems possible in theory you could have stable operation at one-half motor speed (carrying some load). Surely the harmonic design of the motor would be destroyed and therefore if such stable operation were possible you might likely have some problems with vibration and anomalies such as cogging and cusps in torque speed curve.
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RE: WYE Motor Connections
while
a b c a' b' c' follows in the sequence listed for a b c sequence applied voltage.
So that theoretical 1/2 speed mode I mentioned would also be reversed in direction.
Also if it was successful there would be substantially reduced fundamental primary flux due to lack of constructive addition of adjacent poles. Result is that if the motor could run at half speed, the torque capability would be reduced and horsepower (torque times speed) reduced by factor of more than 2.
I'm a little bit out on a limb on all this. I've certainly never tried it. Interested to hear any other comment on whether a motor could be made to operate in reverse at half speed through intentional miswiring.
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RE: WYE Motor Connections
It seems that you switched the terminals of one phase (T3-T6). Am I right?
Tommy
RE: WYE Motor Connections
You are correct. The leads from one phase were reversed.
Ken
RE: WYE Motor Connections
Did you try this and know the answer (and just testing us) or not?