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why doesn't a three-phase motor need a
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neutral if you've worked with
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three-phase motors you've probably
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noticed that they don't have a neutral
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connection unlike residential or
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commercial wiring where neutral is
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essential three-phase Motors operate
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just fine without it let's break down
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why in a three-phase system the
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three-phase voltages are 120° out of
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phase mathematically the sum of the
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instantaneous currents in a balance
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system is always zero since there's no
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residual current that needs a return
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path a neutral isn't necessary this is
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the fundamental reason why three-phase
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loads especially Motors don't require a
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neutral connection three-phase Motors
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are typically wired in either y or Delta
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configurations Delta connection the
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windings are connected end to end
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forming a closed loop so there's no
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neutral point at all each phase only
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sees the line toline voltage why
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connection there is a neutral point but
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in industrial motor applications it's
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rarely used the motor windings still
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receive a balanced three-phase Supply
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making the neutral unnecessary in both
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cases phase voltages and currents remain
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balanced eliminating the need for return
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path via neutral why neutral is used in
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other applications in singlephase
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systems neutral is necessary because the
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load is connected between phase and
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neutral and the return current needs a
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path back to the transformer in a
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three-phase system neutral is mainly
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used for unbalanced loads such as mixed
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singlephase equipment in buildings but
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for for Motors where all three phases
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are symmetrically loaded neutral has no
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role balance system no return current so
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no neutral needed Delta connection no
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neutral point exists y connection
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neutral is available but unnecessary for
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Motors neutral is for unbalanced loads
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not for balanced three-phase loads like
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Motors that's why three-phase Motors
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don't have or need a neutral connection
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if you work with motors understanding
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this principle helps in troubleshooting
1:58
and system design got questions drop
2:01
them in the comments and if you found
2:03
this useful share it with your fellow
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engineers and electricians
