b/c if voltage decreases therefore the current is increases
due to p=v*i & hence if current is increases therefore the
magnetic flux will also increases & hence there is good
magnetic strength will occurs
It is the requirement of the machine.we can either operate
in 440 or 220 or even in 110 volts.The voltage depends upon
the motor,circuit and other loads related with the machine.
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You cannot have 380 V between 'phases'. You can, on the other hand, have 380 V 'between lines'! '380 V between lines' refers to the voltage measured between any pair of line conductors in a three-phase system.
If it is a 240 v delta motor it needs a 240 v three-phase supply, which has 139 v between line and neutral, so 440 v would not be acceptable.
Answer for European SystemsThe nominal line-to-line voltage used for single-phase supplies in Europe is 400 V. In the UK, this voltage is allowed to vary between -6% and +10%; in other words, it can vary between 376 V and 440 V. So it would be quite acceptable for a 380-V and a 415-V motor to operate on this system.
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Work W=VC where V is voltage and C is charge. WORK is power power= I X V I=CURRENT V=EMF